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Nucleation of Polymers in Nanopores and Nanocomposites with Nanoparticles/Nanosheets 认领 引用
1
作者 Ming Wang Ye Yao +4 位作者 Hui Zhao Wei-Long Ju Yun-Lan Su Du-Jin Wang Guo-Ming Liu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第1期1-12,I0007,共12页
Nucleation,which is the initial step of crystallization,critically governs the polymer crystallization behavior,influencing the crystallization temperature,kinetics,and morphology.However,the direct observation of the... Nucleation,which is the initial step of crystallization,critically governs the polymer crystallization behavior,influencing the crystallization temperature,kinetics,and morphology.However,the direct observation of the nucleation process in polymers remains elusive owing to spatial and temporal resolution limitations.This feature article summarizes the recent progress in understanding polymer nucleation within confined and interface-dominated environments,focusing on three representative systems:anodic aluminum oxide templates and nanocomposites containing nanoparticles or nanosheets.The interplay between finite size and interfacial effects has revealed some novel phenomena,such as homogeneous nucleation,surface nucleation,prefreezing,and supernucleation. 展开更多
关键词 Homogeneous nucleation Surface nucleation Prefreezing Supernucleation Confinement effects
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Overcoming challenges in InP-based quantum dots:from nucleation mechanisms to high-performance quantum dot light-emitting diodes 认领 引用
2
作者 Yangyang Bian Qian Li +3 位作者 Fei Chen Chunhe Yang Huaibin Shen Aiwei Tang 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2026年第3期42-79,共38页
Indium phosphide-based quantum dots(InP-based QDs)have emerged as promising candidates for nextgeneration display and optoelectronic technologies,offering exceptional photoluminescent(PL)properties including high effi... Indium phosphide-based quantum dots(InP-based QDs)have emerged as promising candidates for nextgeneration display and optoelectronic technologies,offering exceptional photoluminescent(PL)properties including high efficiency,narrow emission spectra,and precisely tunable wavelengths.Nevertheless,their widespread commercialization encounters substantial obstacles,primarily stemming from persistent challenges in synthetic control and material processing.Critical performance parameters—including photoluminescence quantum yield(PL QY,currently35 nm)as well as external quantum efficiency(EQE)and operational stability of device—continue to show only incremental improvements,highlighting the urgent need for fundamental breakthroughs in QDs synthesis,surface engineering and device optimization.This review systematically examines the nucleation mechanisms governing InP core formation and outlines key strategies for optimizing InP-based core/shell QDs.Furthermore,we present a comprehensive analysis of recent breakthroughs in red,green,and blue-emitting InP-based QD light-emitting diodes(QLEDs)development,focusing on modulation of charge transport engineering and suppression of charge leakage.Finally,we critically evaluate the remaining commercialization challenges and future prospects for InP-based QLEDs in next-generation display and optoelectronic technologies,outlining potential pathways for overcoming current limitations. 展开更多
关键词 indium phosphide quantum dot nucleation mechanism core/shell engineering ligand engineering quantum dot light-emitting diode
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Atmospheric new particle formation from sulfuric acid-amine nucleation in a rural area of the North China Plain 认领 引用
3
作者 Yiliang Liu Yiqun Lu +6 位作者 Gan Yang Chuang Li Yuwei Wang Runlong Cai Lei Yao Yang Chen Lin Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期597-604,共8页
New particle formation(NPF)is a key source of atmospheric ultrafine particles.While previous studies have identified NPF pathways across various environments,its mechanisms in polluted rural areas remain poorly unders... New particle formation(NPF)is a key source of atmospheric ultrafine particles.While previous studies have identified NPF pathways across various environments,its mechanisms in polluted rural areas remain poorly understood.This study presents field observations from a polluted rural region in the North China Plain,revealing that sulfuric acid(SA)-dimethylamine(DMA)-H2O nucleation dominated the observed NPF events.This study quantitatively examined the initial formation of SA clusters under varying nucleation precursor concentrations and background particle concentrations.The observed SA dimer concentrations correlated well with the predictions of the SA-DMA-H2O nucleation mechanism.Decreased DMA concentration and elevated condensation sink(CS)suppressed SA dimer formation.We also introduced a diagnostic parameter—the ratio of SA dimers to the square of SA monomers,[(SA)2]/[(SA)1]2,to characterize the nucleation probability.Notably,strong NPF events tend to occur when this ratio exceeded 5×10–9cm3.These findings offer new insights into NPF dynamics in polluted rural environments,highlighting the complex interactions between multiple precursors and atmospheric conditions. 展开更多
关键词 New particle formation Sulfuric acid-dimethylamine nucleation Rural area North China Plain
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The enhanced role of formic acid on sulfuric acid-ammonia-driven nucleation in forest regions and polluted city areas 认领 引用
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作者 Shasha Chen Rongrong Li +6 位作者 Chengyan Zhang Shuqin Wei Rui Wang Biwu Chu Xiaomeng Zhang Hao Li Tianlei Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期621-628,共8页
Formic acid(FA)is particularly prominent for its ubiquity and structural simplicity among atmospheric organic acids,and exerts a significant influence on atmospheric acidity.However,the potential contribution of FA to... Formic acid(FA)is particularly prominent for its ubiquity and structural simplicity among atmospheric organic acids,and exerts a significant influence on atmospheric acidity.However,the potential contribution of FA to the primary stage of new particle formation(NPF)remains unclear.Herein,molecular dynamics(MD),density functional theory(DFT)and the atmospheric cluster dynamics code(ACDC)model have been utilized to evaluate the mechanism of FA participation in atmospheric SA(sulfuric acid)-A(ammonia)clusters.The MD simulations qualitatively suggest that FA can aggregate with SA and A to form larger clusters,and the aggregation time of the largest clusters decreases as the temperature decreases.The DFT and ACDC findings indicate that the ternary SA-A-FA system is thermodynamically more stable at low temperatures(238.15 K).Simultaneously,in regions with low temperatures,high[FA](1011molecules/cm3),low[SA](106 molecules/cm3)and high[A](1011molecules/cm3),FA significantly enhances SA-A cluster formation rates.The low-temperature NPF mechanism implies that FA could facilitate the growth of pure SA-A clusters via a“catalytic”mechanism and play an integral role in the genesis of critical clusters as a“participant”.This dual role differs from the“catalytic”role exhibited by malonic and glycolic acids in our previous studies.This discovery could help identify the sources of unexplained NPFs in regions with high FA concentrations,such as densely forested areas with abundant vegetation,regions affected by biomass burning,or periods with elevated vehicle exhaust emissions and the release of volatile organic compounds like isoprene and terpenoids. 展开更多
关键词 New particle formation Aggregation trend Formation rate Enhanced strength Nucleation mechanism
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Coupled Modeling of CO2 Frosting,Fluid Flow,and Heat Transfer under Cryogenic Conditions Using a Nucleation-Based CFD Framework 认领 引用
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作者 Xuewen Cao Zhe Chen +1 位作者 Gaoya Ding Wei You 《Fluid Dynamics & Materials Processing》 EI 2026年第7期144-171,共28页
A two-dimensional Computational Fluid Dynamics(CFD)model,grounded in classical nucleation theory,is developed to investigate CO2 frosting and the associated heat transfer under cryogenic conditions.The model integr... A two-dimensional Computational Fluid Dynamics(CFD)model,grounded in classical nucleation theory,is developed to investigate CO2 frosting and the associated heat transfer under cryogenic conditions.The model integrates gas–solid phase-change kinetics with multiphysics transport equations to capture the coupled phenomena governing frost formation.The Peng–Robinson equation of state is employed to predict CO2 frost points in binary mixtures,with model predictions validated against experimental data,yielding errors in frost thickness and thermal conductivity below 15%.The results demonstrate that decreasing the cryogenic wall temperature from 160 K to 150 K increases the average frost thickness and density by 57% and 78%,respectively,while advancing the peak in thermal resistance by approximately 5 min.A reduction in CO2 mol fraction from 10% to 6% leads to an 82% decrease in average frost density.Although inlet velocity exerts a limited influence on frost density,excessively high velocities increase porosity and inhibit densification.Flow field analysis reveals that progressive frost growth constricts the effective channel area,resulting in a local velocity increase of approximately 23%.Moreover,the spatial distributions of supersaturation and nucleation rate exhibit strong consistency.These findings elucidate the complex coupling between CO2 frosting,fluid flow,and heat transfer in Pressurized Liquefied Natural Gas(PLNG)systems,offering theoretical insights for optimizing low-energy CO2 cryogenic capture and enhancing natural gas liquefaction processes. 展开更多
关键词 PLNG CO2frosting model of nucleation cryogenic heat exchange CFD simulation
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Review of heterogeneous nucleation to microstructure refinement in steel induced by second phase 认领 引用
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作者 Zi-Yi Ge Chuang Feng +4 位作者 Yong-Kun Yang Ji Zhou Guo-Xing Qiu Xiao-Ming Li Dong-Ping Zhan 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期311-328,共18页
Heterogeneous nucleation,characterized by its low nucleation barrier and controllable nucleation sites,has been widely employed to manipulate the microstructures and properties of metallic materials.In recent years,th... Heterogeneous nucleation,characterized by its low nucleation barrier and controllable nucleation sites,has been widely employed to manipulate the microstructures and properties of metallic materials.In recent years,the dispersion of inclusions,carbides,and microstructure refinement in steel have emerged as one of the key research directions in the development of high-quality steel.The current research status regarding the regulation of inclusions,carbides,and microstructures in steel through heterogeneous nucleation are reviewed.The key points and challenges in refining the second phase and microstructure in steel using inclusion particles are highlighted,aiming to provide inspiration and references for future scholars.Deoxidized inclusions,when refined and dispersed,exhibit favorable lattice matching with second phases(e.g.,nitrides,sulfides,carbides)in steel.This characteristic serves as the fundamental mechanism for achieving refinement of the second phase.Concurrently,the solid-solution alloying effect from deoxidizing metals contributes to second-phase refinement,an aspect that requires prioritized investigation.In addition to the single heterogeneous nucleation refinement effect,the two-stage heterogeneous nucleation refinement of the second phase and microstructure offers a new approach for follow-up research.Notably,second-phase particles added as heterogeneous nucleation sites via external addition often require surface modification to ensure their stable retention in steel at high temperatures,which remains a major challenge restricting the widespread application of this method.Currently,the explanation of heterogeneous nucleation phenomena primarily relies on empirical calculations of lattice mismatch between the substrate and the nucleating phase,which cannot fully elucidate the quantitative relationship on the interface between the substrate and the nucleation phase.On this basis,quantifying the electronic structure and nucleation barrier at the interface between the substrate and the nucleation phase is a critical direction worthy of increased attention in the future. 展开更多
关键词 Heterogeneous nucleation Inclusion metallurgy Interface Second phase Microstructure
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Modification of inclusion and heterogeneous nucleation behavior in heavy rail steel treated with rare earth 认领 引用
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作者 Qian Meng Yi Wang +2 位作者 Wen Wang Jian-Zhong He Jian-Xun Fu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期171-184,共14页
As a core load-bearing component of railway systems,heavy rail steel is prone to crack initiation induced by inclusions during service,which adversely affects its fatigue life.Owing to its excellent deoxidation,desulf... As a core load-bearing component of railway systems,heavy rail steel is prone to crack initiation induced by inclusions during service,which adversely affects its fatigue life.Owing to its excellent deoxidation,desulfurization,and inclusion modification capabilities,the rare earth element Ce is considered an effective approach to improving steel quality.A combined approach of thermodynamic calculations,high-temperature melting experiments,and crystallographic analysis was employed to systematically investigate the modification mechanism of inclusions and the heterogeneous nucleation behavior induced by Ce in heavy rail steel.The results show that the primary inclusions in untreated heavy rail steel are large,irregular MnS particles and nearly spherical Al2O3-SiO2-CaO complex inclusions.After Ce addition,Ce reacts not only with free O,S,and Al in the molten steel but also modifies the existing inclusions into smaller,more spherical or ellipsoidal CeAlO3,Ce2O3,Ce2O2S,and their composite forms.Due to the better toughness of Ce2O3and Ce2O2S,when they envelop the harder CeAlO3core,they help alleviate stress concentration at the interface with the steel matrix,thereby improving the mechanical properties of the steel.With the increasing Ce content,the inclusion size shows a trend of first decreasing and then increasing.The optimal modification effect is observed when the Ce content is in the range of 0.0017%-0.0026%.The overall evolution sequence of inclusions is as follows:Al2O3+MnS→CeAlO3+MnS→Ce2O2S+MnS→Ce2O2S+Ce2S3→Ce2O2S+Ce3S4+CeS→Ce2O2S+CeS.Furthermore,the two-dimensional lattice disregistry analysis reveals that rare earth inclusions exhibit better lattice matching withγ-Fe than Al2O3,indicating stronger heterogeneous nucleation potential.During solidification,Ce2O3and Ce2O2S tend to nucleate on CeAlO3surfaces to form complex inclusions,which in turn provide nucleation sites forγ-Fe and promote grain refinement. 展开更多
关键词 Heavy rail steel Inclusion Rare earth treatment Thermodynamic calculation Lattice disregistry Heterogeneous nucleation
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Commercial Sugar Alcohol Boosts Nucleation and Crystallization Ability of Poly(ethylene succinate)via Combination of Intermolecular Interactions and Epitaxial Templating 认领 引用
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作者 Hao-Ting Yin Dong-Yuan Ye +3 位作者 Wei Zhao Xue-Wei Wei Xiao-Yu Meng Hai-Mu Ye 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第3期781-791,I0014,共11页
Poly(ethylene succinate)(PES),a promising biodegradable polyester with cost advantages,suffers from inherently slow crystallization kinetics,which severely limits its processability and practical applications.To addre... Poly(ethylene succinate)(PES),a promising biodegradable polyester with cost advantages,suffers from inherently slow crystallization kinetics,which severely limits its processability and practical applications.To address this challenge,this study explored the use of commercially available,low-cost,and food-safe sugar alcohols,including Xylitol(Xy),D-sorbitol(DS),and D-mannitol(DM),as effective nucleating agents for PES.Remarkably,all three polyols significantly enhanced the nucleation and crystallization ability of PES,with DM exhibiting the most pronounced effect.DM increased the crystallization temperature by up to 23.9°C and accelerated the overall crystallization rate by more than 13-fold at only 0.5 wt%loading level.Through a combination of differential scanning calorimetry(DSC),polarized optical microscopy(POM),and wide-angle X-ray diffraction(WAXD)analyses,we revealed that DM promotes PES crystallization via a dual mechanism:epitaxial templating facilitated by excellent lattice matching,and enhanced chain adjustment through intermolecular hydrogen-bonding interactions.In contrast,Xy and DS primarily function through hydrogen-bonding interactions.This work not only identifies DM as a highly efficient,economical,and industrially viable nucleating agent for PES,but also provides fundamental insights into the role of the molecular structure and crystallization ability of nucleating agents in regulating polymer crystallization. 展开更多
关键词 Poly(ethylene succinate) Polyol Crystallization Nucleation
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Effects of surface roughness and wettability on bubble nucleation of water containing insoluble gas:A molecular dynamics study 认领 引用
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作者 Sicheng Zhang Mian Yu +2 位作者 Bingheng Li Lianxiang Ma Yuanzheng Tang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第3期18-25,共8页
As heat dissipation in micro-and nanoelectronic devices has become a critical bottleneck limiting performance improvement,microscale boiling has attracted increasing attention in recent years.Bubble nucleation in wate... As heat dissipation in micro-and nanoelectronic devices has become a critical bottleneck limiting performance improvement,microscale boiling has attracted increasing attention in recent years.Bubble nucleation in water containing nitrogen as an insoluble gas on copper surfaces with varying roughness and wettability is systematically investigated using molecular dynamics(MD)simulations.The results show that increasing surface roughness significantly enhances bubble nucleation by providing additional nucleation sites.The characteristic time of bubble nucleation in water containing insoluble gas decreases with reduced surface hydrophilicity,which differs markedly from previous MD studies of boiling in pure water.This finding suggests that enhanced adsorption of insoluble gas on hydrophobic surfaces facilitates bubble nucleation,in good agreement with experimental observations.These results provide valuable theoretical insights into microscale boiling heat transfer and offer guidance for optimizing thermal management in micro-and nanoelectronic systems. 展开更多
关键词 bubble nucleation molecular dynamics roughness wettability insoluble gas
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In-situ TEM unveils the secrets of two-dimensional material nucleation 认领 引用
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作者 Lei Liu Xiaotian Zhang +1 位作者 Taotao Li Xinran Wang 《Journal of Semiconductors》 EI CAS CSCD 2026年第7期24-27,共4页
Two-dimensional(2D)transition-metal dichalcogenides(TMDCs)have quickly become key in the development of next-generation semiconductor technologies.Their van der Waals layered structures,atomic-scale thickness,and exce... Two-dimensional(2D)transition-metal dichalcogenides(TMDCs)have quickly become key in the development of next-generation semiconductor technologies.Their van der Waals layered structures,atomic-scale thickness,and excellent electronic properties offer a promising route to extend device scaling beyond the 1 nm node[1,2].Among the various synthesis strategies,chemical vapor deposition(CVD)using solid precursors has emerged as the most successful method for producing high-quality single-crystal TMDCs in laboratory settings[3−5].Despite substantial advancements in optimizing growth parameters and precursor chemistry,the fundamental mechanisms governing the early stages of nucleation,where atomic condensation and structural reorganization occur,remain elusive.These transient phenomena unfold across ultrafast timescales within complex reaction environments,posing significant challenges for experimental observation. 展开更多
关键词 synthesis strategieschemical vapor deposition cvd using situ TEM ultrafast timescales chemical vapor deposition nucleation D transition metal dichalcogenides van der waals layered structuresatomic scale two dimensional materials
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The triple junction as the preferred nucleation site on the main East Anatolian Fault for the 2023 Mw7.8 Kahramanmaraş Earthquake:Insights from 3D dynamic rupture simulations 认领 引用
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作者 XiuSong Peng ZeYu Lu Feng Hu 《Earth and Planetary Physics》 EI CSCD 2026年第3期512-523,共12页
Understanding rupture transfer across fault junctions is critical for interpreting complex multi-fault earthquakes.For the 2023 Mw7.8 Kahramanmaraş event,we construct three dynamic rupture models constrained by sur... Understanding rupture transfer across fault junctions is critical for interpreting complex multi-fault earthquakes.For the 2023 Mw7.8 Kahramanmaraş event,we construct three dynamic rupture models constrained by surface fault traces,relocated aftershocks,kinematic slip inversions,near-field strong-motion records,and GPS data to distinguish among potential nucleation sites along the East Anatolian Fault(EAF).Our simulations reveal that although the final slip distributions are insensitive to the precise nucleation point owing to complex fault geometry,the dynamic conditions required for rupture initiation on the EAF differ significantly.Nucleation at the triple junction is facilitated by dynamic Coulomb stress triggering from the Narlıbranch fault.Although the supershear rupture velocity is different along the Narlıbranch fault of Model 1 and Model 3,both models support nucleation at the triple junction.In contrast,nucleation at 9 km southwest of the triple junction requires artificial stress concentrations,as shown in Model 2.Model 3 shares the same stress concentration along the EAF;however,its near-P-wave supershear speed along the branch fault narrows the Mach cone and directly impedes nucleation to the southwest.All the models show good correspondence with the near-field seismogram and GPS observations.Additionally,we compare the source time functions of the three models with the U.S.Geological Survey result,which imply that the near-P-wave supershear speed along the branch fault is less likely.Our results suggest the triple junction is the most likely nucleation site,and although the 9 km southwest of the triple junction is still possible,it requires highly localized initial stress concentrations. 展开更多
关键词 branch fault rupture nucleation site dynamic rupture simulation
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Activating Progressive Sn2+ Nucleation by Micellar Structure Electrolyte for Dead-Sn-Free Aqueous Batteries 认领 引用
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作者 Xiaojia Lan Zhaoyu Zhang +7 位作者 Yuekai Lin Wencheng Du Yufei Zhang Minghui Ye Zhipeng Wen Yongchao Tang Xiaoqing Liu Cheng Chao Li 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第7期410-426,共17页
The instantaneous nucleation of Sn originating from the uncontrolled diffusion of Sn2+ions typically forms large,electrochemically inactive“dead Sn”that severely constraints the plating/stripping reversibility of... The instantaneous nucleation of Sn originating from the uncontrolled diffusion of Sn2+ions typically forms large,electrochemically inactive“dead Sn”that severely constraints the plating/stripping reversibility of Sn anode for acidic aqueous batteries.Herein,nanoscale spatial confinement of Sn2+ions is realized in SnSO4 electrolyte by strategically dictating spontaneous assembly of nanomicelles with amphipathic sulfolane.The as-constructed locally heterogeneous environment ensures the sustainable release of Sn2+ions,which reprograms the nucleation manner from instantaneous to progressive modes.The consequent progressive formation of Sn nuclei triggers size refinement of electrodeposited Sn,thereby alleviating the“dead Sn”issue.Meanwhile,the reaction competitivity of Sn2+reduction over hydrogen evolution side reaction is effectively strengthened as the consecutive hydrogen bonding network among bulk water is disrupted by the micellar structure.Consequently,Sn anode exerts an unprecedently high average Coulombic efficiency of 99.97%and witnesses a prominent life span extension from 710 to 8400 h(~11-fold enhancement).In a dual-plating configuration,the Sn||Mn full battery delivers a 1.6 V discharge plateau and sustains 790 cycles,demonstrating practical feasibility.Our findings underscore the decisive role of the very initial nucleation behavior in regulating metal electrochemistry,applicable to other multivalent anodes. 展开更多
关键词 Aqueous electrolyte Sn anode Dead Sn Micellar electrolyte Progressive nucleation
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Discovery of a liquid crystal phase of sodium halides via a nonclassical nucleation pathway 认领 引用
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作者 Jaehyeong Bae Bong Lim Suh +2 位作者 Hamin Shin Jihan Kim Il-Doo Kim 《Advanced Powder Materials》 EI CAS CSCD 2025年第6期50-61,共12页
The crystallization of ionic crystals has traditionally been explained by Gibbs's classical nucleation theory.However,recent observations of intermediate phases during nucleation suggest that the process may be mo... The crystallization of ionic crystals has traditionally been explained by Gibbs's classical nucleation theory.However,recent observations of intermediate phases during nucleation suggest that the process may be more complex,necessitating new theoretical frameworks,though key empirical evidence remains elusive.In this study,we used microdroplets to investigate the crystallization of sodium halides(NaCl,NaBr,and NaI)under homogeneous nucleation conditions across a wide range of supersaturations.In the evaporating droplet,NaCl follows the classical nucleation pathway,whereas NaBr and NaI exhibit the formation of an intermediate phase prior to the nucleation of anhydrous and hydrous single crystals,respectively.Optical and computational analyses indicate that these intermediate phases are liquid crystal phases composed of contact ion pairs.These findings establish a new theoretical framework for crystal nucleation and growth and offer methods to control nucleation pathways,enabling us to achieve desired crystals regardless of specific conditions. 展开更多
关键词 Nonclassical nucleation theory Two-step nucleation Sodium halides Liquid crystal phase Contact ion pairs Birefringence Microdroplets
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Nucleation control for the growth of two-dimensional single crystals 认领 引用 被引量：1
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作者 Jinxia Bai Chi Zhang +3 位作者 Fankai Zeng Jinzong Kou Jinhuan Wang Xiaozhi Xu 《Journal of Semiconductors》 EI CAS CSCD 2025年第9期10-18,共9页
The unique structure and exceptional properties of two-dimensional(2D)materials offer significant potential for transformative advancements in semiconductor industry.Similar to the reliance on wafer-scale single-cryst... The unique structure and exceptional properties of two-dimensional(2D)materials offer significant potential for transformative advancements in semiconductor industry.Similar to the reliance on wafer-scale single-crystal ingots for silicon-based chips,practical applications of 2D materials at the chip level need large-scale,high-quality production of 2D single crystals.Over the past two decades,the size of 2D single-crystals has been improved to wafer or meter scale,where the nucleation control during the growth process is particularly important.Therefore,it is essential to conduct a comprehensive review of nucleation control to gain fundamental insights into the growth of 2D single-crystal materials.This review mainly focuses on two aspects:controlling nucleation density to enable the growth from a single nucleus,and controlling nucleation position to achieve the unidirectionally aligned islands and subsequent seamless stitching.Finally,we provide an overview and forecast of the strategic pathways for emerging 2D materials. 展开更多
关键词 2D materials single crystals nucleation density nucleation position
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A novel strategy for ingot cogging without homogenization:Dynamical recrystallization and nucleation mechanisms associated with as-cast dendrites of nickel-based superalloys 认领 引用 被引量：4
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作者 B.C.Xie Y.W.Luo +3 位作者 Z.T.Wang Q.Q.Meng Y.Q.Ning M.W.Fu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第17期78-91,共14页
Since the as-cast microstructure benefits dynamic recrystallization(DRX)nucleation,the present research is focused on the microstructure evolution associated with the dendrites and precipitates during the thermal defo... Since the as-cast microstructure benefits dynamic recrystallization(DRX)nucleation,the present research is focused on the microstructure evolution associated with the dendrites and precipitates during the thermal deformation of an ingot without homogenization treatment aiming at exploring a new efficient strategy of ingot cogging for superalloys.The as-cast samples were deformed at the sub-solvus temperature,and the DRX evolution from dendritic arms(DAs)to inter-dendritic regions(IDRs)was discussed based on the observation of the fishnet-like DRX microstructures and the gradient of DRX grain size at IDRs.The difference in the precipitates at DAs and IDRs played an essential role during the deformation and DRX process,which finally resulted in very different microstructures in the two areas.A selective straininduced grain boundary bulging(SIGBB)mechanism was found to function well and dominate the DRX nucleation at DAs.The grain boundary was able to migrate and bulge to nucleate on the condition that the boundary was located at DAs and had a great difference in dislocation density between its opposite sides at the same time.As for DRX nucleation at IDRs,the particle-stimulated nucleation(PSN)mechanism played a leading role,and the progressive subgrain rotation(PSR)and geometric DRX were two important supplementary mechanisms.The dislocation accumulation around the coarse precipitates at IDR resulted in progressive orientation rotation,which would generate DRX nuclei once the maximum misorientation there was sufficient to form a high-angle boundary with the matrix.The PSR or geometric DRX functioned at the severely elongated IDRs at the later stage of deformation,depending on the thickness of the elongated IDRs.The uniform microstructure was obtained by the deformation without homogenization and the subsequent annealing treatment.The smaller strain,the lower annealing temperature,and the much shorter soaking time requested in the above process lead to a smaller risk of cracking and a lower consumption of energy during the ingot-cogging process. 展开更多
关键词 Superalloys Ingot cogging Dendrites Dynamic recrystallization Nucleation mechanisms
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Physical mechanisms of earthquake nucleation and foreshocks:Cascade triggering,aseismic slip,or fluid flows? 认领 引用 被引量：9
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作者 Zhigang Peng Xinglin Lei 《Earthquake Research Advances》 CSCD 2025年第2期32-47,共16页
Earthquakes are caused by the rapid slip along seismogenic faults.Whether large or small,there is inevitably a certain nucleation process involved before the dynamic rupture.At the same time,significant foreshock acti... Earthquakes are caused by the rapid slip along seismogenic faults.Whether large or small,there is inevitably a certain nucleation process involved before the dynamic rupture.At the same time,significant foreshock activity has been observed before some but not all large earthquakes.Understanding the nucleation process and foreshocks of earthquakes,especially large damaging ones,is crucial for accurate earthquake prediction and seismic hazard mitigation.The physical mechanism of earthquake nucleation and foreshock generation is still in debate.While the earthquake nucleation process is present in laboratory experiments and numerical simulations,it is difficult to observe such a process directly in the field.In addition,it is currently impossible to effectively distinguish foreshocks from ordinary earthquake sequences.In this article,we first summarize foreshock observations in the last decades and attempt to classify them into different types based on their temporal behaviors.Next,we present different mechanisms for earthquake nucleation and foreshocks that have been proposed so far.These physical models can be largely grouped into the following three categories:elastic stress triggering,aseismic slip,and fluid flows.We also review several recent studies of foreshock sequences before moderate to large earthquakes around the world,focusing on how different results/conclusions can be made by different datasets/methods.Finally,we offer some suggestions on how to move forward on the research topic of earthquake nucleation and foreshock mechanisms and their governing factors. 展开更多
关键词 Foreshocks Earthquake swarms 2024 Noto earthquake Earthquake nucleation Fluids Aseismic slip Haicheng earthquake
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Temperature and loading-rate dependent critical stress intensity factor of dislocation nucleation from crack tip:Atomistic insights into cracking at slant twin boundaries in nano-twinned TiAl alloys 认领 引用
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作者 Rong Fu Zhiyuan Rui +3 位作者 Jun-Ping Du Shihao Zhang Fan-Shun Meng Shigenobu Ogata 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第19期290-303,共14页
This paper investigates the temperature and loading rate dependencies of the critical stress intensity fac-tor(KIC)for dislocation nucleation at crack tips.We develop a new KIC formula with a generalized form by incor... This paper investigates the temperature and loading rate dependencies of the critical stress intensity fac-tor(KIC)for dislocation nucleation at crack tips.We develop a new KIC formula with a generalized form by incorporating the atomistic reaction pathway analysis into Transition State Theory(TST),which cap-tures the KIC of the first dislocation nucleation event at crack tips and its sensitivity to temperature and loading rates.We use this formula and atomistic modeling information to specifically calculate the KIC for quasi-two-dimensional crack tips located at various slant twin boundaries in nano-twinned TiAl al-loys across a wide range of temperatures and strain rates.Our findings reveal that twinning dislocation nucleation at the crack tip dominates crack propagation when twin boundaries(TBs)are tilted at 15.79°and 29.5°.Conversely,when TBs tilt at 45.29°,54.74°,and 70.53°,dislocation slip becomes the preferred mode.Additionally,at TB tilts of 29.5°and 70.53°,at higher temperatures above 800 K and typical exper-imental loading rates,both dislocation nucleation modes can be activated with nearly equal probability.This observation is particularly significant as it highlights scenarios that molecular dynamics simulations,due to their time scale limitations,cannot adequately explore.This insight underscores the importance of analyzing temperature and loading rate dependencies of the KIC to fully understand the competing mechanisms of dislocation nucleation and their impact on material behavior. 展开更多
关键词 Crack Dislocation nucleation Critical stress intensity factor Temperature and loading rate sensitivity Twin boundary Atomistic simulation TiAl alloy
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Introducing high-density growth twins in aluminum alloys by laser surface remelting via templated nucleation of grains 认领 引用 被引量：2
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作者 Chunfeng Ma Qinglong Zhao +2 位作者 Xiao Liu Yanjun Li Qichuan Jiang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第10期315-324,共10页
It is difficult to generate coherent twin boundaries in bulk Al alloys due to their high intrinsic stacking fault energy. Here, we report a strategy to induce high-density growth twins in aluminum alloys through the h... It is difficult to generate coherent twin boundaries in bulk Al alloys due to their high intrinsic stacking fault energy. Here, we report a strategy to induce high-density growth twins in aluminum alloys through the heterogeneous nucleation of twinned Al grains on twin-structured TiC nucleants and the preferred growth of twinned dendrites by laser surface remelting of bulk metals. The solidification structure at the surface shows a mixture of lamellar twinned dendrites with ultra-fine twin boundary spacing (∼2 µm), isolated twinned dendrites, and regular dendrites. EBSD analysis and finite element method (FEM) simulations have been used to understand the competitive growth between twinned and regular dendrites, and the solidification conditions for the preferred growth of twinned dendrites during laser remelting and subsequent rapid solidification are established. It is shown that the reduction in the ratio of temperature gradient G to solidification rate V promotes the formation of lamellar twinned dendrites. The primary trunk spacing of lamellar twinned dendrites is refined by the high thermal gradient and solidification rate. The present work paves a new way to generate high-density growth twins in additive-manufactured Al alloys. 展开更多
关键词 Heterogeneous nucleation Twinned dendrites Solidification Aluminum alloys
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Corrigendum to‘Tuning the nucleation kinetics of phosphate chemical conversion coating on Mg-Gd-Y-Zr magnesium alloy:The effect of pretreatment and organic additive’[Journal of Magnesium and Alloys 13(2025)207–218] 认领 引用 被引量：1
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作者 Siyu Sun Peng Zhou +5 位作者 Yan Chen JinTao Xiao Jingli Sun Yong Yuan Tao Zhang Fuhui Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第5期2433-2434,共2页
The authors regret that due to negligence,the picture was misplaced in the original manuscript,resulting in Fig.6d being incorrectly included.The correct version of Fig.6d is provided below for reference.This error do... The authors regret that due to negligence,the picture was misplaced in the original manuscript,resulting in Fig.6d being incorrectly included.The correct version of Fig.6d is provided below for reference.This error does not affect the conclusions of the study,and we apologize for any confusion it may have caused. 展开更多
关键词 nucleation kinetics fig d pretreatment phosphate chemical conversion coating organic additive magnesium alloy
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TiO2 doping promoted nucleation of CsPb X3(X=Cl,Br,I)quantum dots in glass with improved luminescent performance and stability 认领 引用 被引量：1
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作者 Xiaotu Yang Zihao Yue +3 位作者 Ruixiang Deng Zhengliang Zhang Tao Zhang Lixin Song 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第6期185-195,共11页
Stability hinders further development of all-inorganic CsPb X3(X=Cl,Br,I)quantum dots(QDs)although they exhibit promising prospects in optoelectronic applications.Coating perovskite quantum dots(PQDs)with a glass n... Stability hinders further development of all-inorganic CsPb X3(X=Cl,Br,I)quantum dots(QDs)although they exhibit promising prospects in optoelectronic applications.Coating perovskite quantum dots(PQDs)with a glass network to form QD glass can significantly improve their stability.However,the dense glass network degrades their luminescent performance.In this work,the crystallization behavior of PQDs in glass and better luminescence properties are prompted by introducing titanium dioxide into borosilicate glass.The luminescence intensity of TiO2-doped CsPbBr3QD glass is increased by 1.6 times and the PLQY is increased from 49.8%to 79%compared to the undoped glass.Evidence proves that the improved prop-erties are attributed to the enhanced nucleation effect of titanium dioxide during the annealing process.Benefiting from the densification of the glass network caused by titanium dioxide doping,the stability of the PQD glass is further improved.LED devices with an ultra-wide color gamut that fully covers the NTSC1953 standard and achieves 128.6%of the NTSC1953 standard as well as 91.1%of the Rec.2020 stan-dard were fabricated by coupling PQD glass powder,demonstrating promising commercial applications of PQD glass in optoelectronic displays. 展开更多
关键词 CsPbX3QDs Titanium dioxide Nucleation promotion Luminescent performance WLED device
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