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Chain Rigidity as a Key Regulator on Grafting Density and Dispersity of Polymer Brushes:Insights from Coarse-Grained Molecular Dynamics Simulations 认领 引用
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作者 Zheng‑Jie Zhang Wei‑Shao Xu +6 位作者 Li‑Jun Ma Ying‑Xiang Li Yu‑Qi Guo Guo‑Jie Zhang Zhong‑Yan Zhang Yan Wang Hong Liu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第7期2305-2321,共17页
Polymer brush-based surface modification plays a crucial role in tailoring material properties across a wide range of applications,from biomedicine to electronics.Grafting density and dispersity are key parameters gov... Polymer brush-based surface modification plays a crucial role in tailoring material properties across a wide range of applications,from biomedicine to electronics.Grafting density and dispersity are key parameters governing the performance of polymer brushes;however,the influence of polymer chain rigidity on these characteristics remains insufficiently understood.Polymer chain rigidity is intrinsically determined by chemical structure and can be further modulated by intramolecular and intermolecular interactions,solvent quality,external fields,and topological constraints.In this work,we focus on isolating the role of chain rigidity by controlling it through intramolecular bond-angle interactions in coarse-grained molecular dynamics simulations with an implicit solvent description,allowing a systematic investigation of its role in polymer brush fabrication via both“grafting-to”and“grafting-from”strategies using a stochastic reaction model.For the grafting-to strategy,a moderate increase in chain rigidity enhances grafting density,whereas excessive rigidity restricts chain mobility,thereby hindering grafting efficiency.We further examine the effects of polymer chain length,solution concentration,and surface grafting site density,revealing that grafting kinetics are governed by the cooperative interplay of these factors.To optimize grafting density in binary polymer brushes of flexible and rigid chains using the“grafting-to”strategy,we compare three grafting approaches—flexible-firstigid-second(F/R),rigid-first/flexible-second(R/F),and simultaneous grafting,by varying the initial ratio of rigid chains(λ).The results show that simultaneous grafting with a high fraction of rigid chains yields the highest grafting density,providing a pathway for optimizing the fabrication of high-density polymer brushes.In contrast,for the graftingfrom strategy,with the rigidity range investigated in this study,increasing chain rigidity promotes more extended chain conformations,reduces the spatial shielding of surface initiation sites,and leads to polymer brushes with higher grafting density and lower dispersity.Overall,this study elucidates the mechanistic role of polymer chain rigidity in brush formation and provides theoretical guidance for the rational design and controlled fabrication of high-performance surface-modified materials through conformational regulation. 展开更多
关键词 Grafting-from Grafting-to Chain rigidity Polymer brushes Coarse-grained molecular simulation
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Asymmetric quasi-solid-state composite electrolytes via selfassembly of molecular brushes and hairy nanoparticles for dendrite-free lithium metal batteries 认领 引用
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作者 Shenghao Lin Yin Cui +3 位作者 Guofang Yu Dongtian Miao Ruliang Liu Dingcai Wu 《Energy Materials and Devices》 CAS 2026年第2期43-52,共10页
The practical application of lithium metal batteries is severely hindered by flammable liquid electrolytes and uncontrollable lithium dendrite growth.In this study,we propose a novel asymmetric quasi-solid-state compo... The practical application of lithium metal batteries is severely hindered by flammable liquid electrolytes and uncontrollable lithium dendrite growth.In this study,we propose a novel asymmetric quasi-solid-state composite electrolyte(denoted as QSCE-BPL/LPE/PDL)designed to overcome these challenges.QSCE-BPL/LPE/PDL is fabricated by evaporation-induced self-assembly of one-dimensional molecular brush BC-g-PLiSTFSI[BC=bacterial cellulose,PLiSTFSI=poly(lithium 4-styrenesulfonyl-(trifluoromethylsulfonyl)imide)]and zero-dimensional hairy nanoparticle LL-g-PEGMA[LL=Li6.4La3Zr1.4Ta0.6O12,PEGMA=poly(oligo(ethylene glycol)methyl ether methacrylate)],followed by in situ cationic ring-opening polymerization of 1,3-dioxolane.The resulting ultrathin QSCE-BPL/LPE/PDL(19μm)possesses a unique asym-metric architecture comprising a rigid layer of hairy nanoparticles to suppress dendrite penetration and a composite layer to ensure good interfacial contact with the cathode.The grafted PLiSTFSI side chains enable single Li+conduction to reduce concentration polarization,and the PEGMA side chains promote lithium salt dissociation to accelerate Li+trans-port.This design yields a three-dimensional porous network that provides continuous and fast Li+transport pathways.The optimized electrolyte achieves a high ionic conductivity of 5.44×10−4 S cm−1 and a Li+transference number of 0.67 at room temperature.Consequently,Li/LiFePO4 cells with QSCE-BPL/LPE/PDL can operate stably for 200 cycles with a high-capacity retention of 94%at 0.5 C.This study provides a feasible molecular engineering strategy for developing high-performance and safe lithium metal batteries. 展开更多
关键词 quasi-solid-state composite electrolyte molecular brush hairy nanoparticle lithium metal battery
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Effect of Thickness on the pH Responsiveness of Strong Polyelectrolyte Brushes 认领 引用
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作者 Guang-Tao Mei Yue Huang +1 位作者 Jian Zhang Guang-Ming Liu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第12期2185-2190,I0006,共6页
Strong polyelectrolyte brushes(SPBs)play an important role in enabling material surface functionalization due to their unique stimuli-responsive properties.Although the unexpected pH responsiveness of SPBs has been re... Strong polyelectrolyte brushes(SPBs)play an important role in enabling material surface functionalization due to their unique stimuli-responsive properties.Although the unexpected pH responsiveness of SPBs has been revealed in the past ten years,it is still unclear if the pH-responsive properties of SPBs are affected by the brush thickness.In this study,we employed the positively charged poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride(PMETAC)and negatively charged sodium poly(styrenesulfonate)(NaPSS)brushes as model systems to explore the effect of thickness on the pH-responsive properties of SPBs.The results demonstrate that the pH-responsive properties of SPBs manifest different dependences on the brush thickness.Specifically,for both PMETAC and NaPSS brushes,the pH-responsive hydration and stiffness are influenced by the thickness,and the pH-responsive wettability and adhesion are almost unaffected by the thickness.This work not only provides a clear understanding of the relationship between the brush thickness and the pH responsiveness of SPBs,but also offers a new method to control the pH-responsive properties of SPBs. 展开更多
关键词 Strong polyelectrolyte brushes pH responsiveness Brush thickness Counterion-mediated hydrogen bonding
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Characterization of the airborne bacteria community at different distances from the rotating brushes in a wastewater treatment plant by 16S rRNA gene clone libraries 认领 引用 被引量：14
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作者 Yunping Han Lin Li Junxin Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第1期5-15,共11页
Biological risks of bioaerosols emitted from wastewater treatment processes have attracted wide attention in the recent years. However, the culture-based analysis method has been mostly adopted for detecting the bacte... Biological risks of bioaerosols emitted from wastewater treatment processes have attracted wide attention in the recent years. However, the culture-based analysis method has been mostly adopted for detecting the bacterial community in bioaerosols, which may result in the underestimation of total microorganism concentration as not all microorganisms are cultivable. In this study, oligonucleotide fingerprinting of 16S rRNA genes was applied to reveal the composition and structure of the bacterial community in bioaerosols from an Orbal oxidation ditch in a Beijing wastewater treatment plant （WWTP）. Bioaerosols were collected at different distances from the aerosol source, rotating brushes, and the sampling height was 1.5 m which is the common respiratory height of a human being. The bacterial communities of bioaerosols were diverse, and the lowest bacterial diversity was found at the sampling site just after the rotating brush rotating brush. A large proportion of bacteria in bioaerosols were affiliated with Proteobacteria and Bacteroidetes. Numerous bacteria present in the bioaerosols also emerged in water, indicating that the bacterial community in the bioaerosols was related to that of the aerosols＇ sources. The forced aeration of rotating brushes brought about observably distinct bacterial communities between sampling sites situated before and after the rotating brush. Isolation sources of closest relatives in bioaerosols clone libraries were associated with the aqueous environment in the WWTP. Common potential pathogens in bioaerosols as well as those not reported in previous research were also analyzed in this study. Measures should be adopted to reduce the emission of bioaerosols and prevent their exposure to workers. 展开更多
关键词 airborne bacteria genetic structure clone library wastewater treatment plant rotating brushes
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A Theoretical Investigation on the pH-induced Switching of Mixed Polyelectrolyte Brushes 认领 引用 被引量：7
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作者 赵新军 Guo-liang Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2014年第5期568-576,共9页
A theoretical investigation on the pH-induced switching of mixed polyelectrolyte brushes was performed by using a molecular theory. The results indicate that the switching properties of mixed polyelectrolyte brushes a... A theoretical investigation on the pH-induced switching of mixed polyelectrolyte brushes was performed by using a molecular theory. The results indicate that the switching properties of mixed polyelectrolyte brushes are dependent on the pH values. At low pH, negatively charged chains adopt a compact conformation on the bottom of the brush while positively charged chains are highly stretched away from the surface. At high pH values, the inverse transformation takes place. The role of pH determining the polymer chains conformation and charge behavior of mixed polyelectrolyte brushes was analyzed. It is found that there exists a mechanism for reducing strong electrostatic repulsions： stretching of the chains. The H＋ and OH- units play a more important role as counterions of the charged polymers do. The collapse of the polyelectrolyte chains for different pH values could be attributed to the screening of the electrostatic interactions and the counterion-mediated attractive interaction along the chains. 展开更多
关键词 Mixed polyelectrolyte brushes Molecular theory pH-induced switching.
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Polypeptide Brushes Grown via Surface-initiated Ring-opening Polymerization of α-Amino Acid N-Carboxyanhydrides 认领 引用 被引量：2
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作者 Yong Shen 李志波 Harm-Anton Klok 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2015年第7期931-931,932-946,共1页
Polypeptide brushes are attractive platforms to generate functional and responsive interfaces that are of potential interest due to their possible biodegradability, biocompatibility and tunable secondary structures. S... Polypeptide brushes are attractive platforms to generate functional and responsive interfaces that are of potential interest due to their possible biodegradability, biocompatibility and tunable secondary structures. Surface-initiated ringopening polymerization（SI-ROP） of α-amino acid N-carboxyanhydrides represents a powerful and versatile strategy to generate polypeptide brushes. This review is an attempt to capture the state-of-the-art in this field and highlights the latest developments in several selected areas. In addition to presenting an overview of the synthetic methods that have been used to generate polypeptide brushes via SI-ROP, this article will discuss the preparation of patterned polypeptide brushes, the conformational properties of surface-tethered polypeptides, ways to control chain orientation at surfaces as well as properties and applications of these thin polymer films. 展开更多
关键词 Polypeptide brushes Surface α-Amino acid N-carboxyanhydrides Ring-opening polymerization Secondary structure
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Role of hydrogen bonding in solubility of poly(N-isopropylacrylamide) brushes in sodium halide solutions 认领 引用 被引量：3
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作者 赵新军 高志福 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期277-285,共9页
By employing molecular theory, we systematically investigate the shift of solubility of poly（N-isopropylacrylamide）（PNIPAM） brushes in sodium halide solutions. After considering PNIPAM–water hydrogen bonds, water... By employing molecular theory, we systematically investigate the shift of solubility of poly（N-isopropylacrylamide）（PNIPAM） brushes in sodium halide solutions. After considering PNIPAM–water hydrogen bonds, water–anion hydrogen bonds, and PNIPAM–anion bonds and their explicit coupling to the PNIPAM conformations, we find that increasing temperature lowers the solubility of PNIPAM, and results in a collapse of the layer at high enough temperatures. The combination of the three types of bonds would yield a decrease in the solubility of PNIPAM following the Hofmeister series： Na Cl＆gt;Na Br＆gt;Na I. PNIPAM–water hydrogen bonds are affected by water–anion hydrogen bonds and PNIPAM–anion bonds. The coupling of polymer conformations and the competition among the three types of bonds are essential for describing correctly a decrease in the solubility of PNIPAM brushes, which is determined by the free energy associated with the formation of the three types of bonds. Our results agree well with the experimental observations, and would be very important for understanding the shift of the lower critical solution temperature of PNIPAM brushes following the Hofmeister series. 展开更多
关键词 molecular theory PNIPAM brushes anion effect hydrogen bonds
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Numerical Analysis of Tilted Cutting and F128 Brushes 认领 引用
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作者 Libardo V.Vanegas-Useche Magd M.Abdel-Wahab Graham A.Parker 《Computer Modeling in Engineering & Sciences》 SCIE EI 2019年第10期23-47,共25页
Road sweeping is an essential service that has to be conducted for public health,as well as aesthetic purposes.In many countries,sweeping vehicles are used for this activity.They usually comprise a gutter brush that s... Road sweeping is an essential service that has to be conducted for public health,as well as aesthetic purposes.In many countries,sweeping vehicles are used for this activity.They usually comprise a gutter brush that sweeps the debris that is located in the road gutter.This work studies the performance of two kinds of gutter brushes:a cutting brush and a flicking(F128)brush.This is carried out by means of a 3-D dynamic,nonlinear Finite Element(FE)brush model developed by the authors.In this model,inertia forces are applied to the bristle,and its clamped end is fixed.Consequently,the surface(road)is rotated,translated,and raised.Bristle-road interaction is modelled as flexible-to-rigid contact.In particular,the aim of this article is to compare the performance of a conventional brush and a brush rotating at variable speed.As brushes normally work tilted,FE analyses are carried out for tilted cutting and F128 brushes,rotating at speeds that fluctuate at different frequencies.It is concluded that brush oscillations have a significant effect on bristle tip velocities and bristle-road forces.Also,at certain frequencies,oscillations seem to improve sweeping performance of the F128 brush.However,they do not appear to improve significantly the performance of the cutting brush. 展开更多
关键词 Gutter brushes cutting brush flicking brush FEM variable speed brushing
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Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes 认领 引用
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作者 Xin-Jun Zhao Zhi-Fu Gao 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第6期262-269,共8页
In this work,we investigate the effects of thiocyanate anions on the switching and the structure of poly(Nisopropylacrylamide)(PNIPAM)brushes using a molecular theory.Our model takes into consideration the PNIPAM–ani... In this work,we investigate the effects of thiocyanate anions on the switching and the structure of poly(Nisopropylacrylamide)(PNIPAM)brushes using a molecular theory.Our model takes into consideration the PNIPAM–anion bonds,the electrostatic effects and their explicit coupling to the PNIPAM conformations.It is found that at low thiocyanate anion concentration,as the anion concentration of thiocyanate increases,thiocyanate anions are more associated with PNIPAM chains through the PNIPAM–anion bonds,which contributes to stronger electrostatic repulsion and leads to an increase of lower critical solution temperature(LCST).By analyzing the average volume fractions of PNIPAM brushes,it is found that the PNIPAM brush presents a plateau structure.Our results show that the thiocyanate anions promote phase segregation due to the PNIPAM–anion bonds and the electrostatic effect.According to our model,the reduction of LCST can be explained as follows:at high thiocyanate anion concentration,with the increase of thiocyanate concentration,more ion bindings occurring between thiocyanate anions and PNIPAM chains will result in the increase of the hydrophobicity of PNIPAM chains;when the increase of electrostatic repulsion is insufficient to overcome the hydrophobic interaction of PNIPAM chains,it will lead to the reduction of brush height and LCST at high thiocyanate anion concentration.Our theoretical results are consistent with the experimental observations,and provide a fundamental understanding of the effects of thiocyanate on the LCST of PNIPAM brushes. 展开更多
关键词 molecular theory PNIPAM brushes effect of thiocyanate anions
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Modification of Titanium Surfaces via Surface-initiated Atom Transfer Radical Polymerization to Graft PEG-RGD Polymer Brushes to Inhibit Bacterial Adhesion and Promote Osteoblast Cell Attachment 认领 引用
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作者 陈琦 LIU Di +2 位作者 GONG Yuejiao XIAO Qun 李志安 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1225-1231,共7页
Implant-related infection is one of the key concerns in clinical medicine, so the modification of titanium to inhibit bacterial adhesion and support osteoblast cell attachment is important. In this article, two strate... Implant-related infection is one of the key concerns in clinical medicine, so the modification of titanium to inhibit bacterial adhesion and support osteoblast cell attachment is important. In this article, two strategies were used to examine the above effects. First, modification of titanium via surface-initiated atom transfer radical polymerization（ATRP） was performed. The surface of the titanium was activated initially by a silane coupling agent. Well-defined polymer brushes of poly（ethylene glycol） methacrylate were successfully tethered on the silane-coupled titanium surface to form hydration shell to examine the anti-fouling effect. Second, functionalization of the Ti-PEG surface with RGD was performed to examine the anti-bacterial adhesion and osteoblast cell attachment ability. The chemical composition of modified titanium surfaces was characterized by X-ray photoelectron spectroscopy（XPS）. Changes in surface hydrophilicity and hydrophobicity were characterized by static water contact angle measurements. Results indicated that PEG-RGD brushes were successfully tethered on the titanium surface. And anti-bacterial adhesion ability and osteoblast cell attachment ability were confirmed by fluorescence microscopy and scanning electron microscopy. Results indicated that PEG can inhibit both bacterial adhesion and osteoblast cell attachment, while PEG-RGD brushes can not only inhibit bacterial adhesion but also promote osteoblast cell attachment. 展开更多
关键词 modification of titanium ATRP anti-bacterial adhesion osteoblast cell attachment PEG RGD brushes
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Enhancing the ionic conductivity in a composite polymer electrolyte with ceramic nanoparticles anchored to charged polymer brushes 认领 引用 被引量：3
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作者 Bintao Zhao Xi Lu +3 位作者 Qian Wang Jingfa Yang Jiang Zhao Henghui Zhou 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第3期831-835,共5页
Polymer electrolytes a re essential for next-gene ration lithium batteries because of their excellent safety record.However,low ionic conductivity is the main obstacle restricting their commercial application.Composit... Polymer electrolytes a re essential for next-gene ration lithium batteries because of their excellent safety record.However,low ionic conductivity is the main obstacle restricting their commercial application.Composites with nanoparticles are a promising route to overcome this obstacle.In this work,lithium polystyrene sulfonate brushes(LiPSS)is anchored to silicon dioxide nanoparticles with chemical bonding using atom transfer radial polymerization(SI-ATRP).The composite polymer electrolytes are made by mixing vinylene carbonate and nanoparticles via a facile in situ polymerization process.The ionic conductivity of composite polymer electrolytes is improved to 7.2×10^-4 S/cm at room temperature,which is attributed to the low degree of crystallinity of polymer electrolyte and the fast ion transport on the surfaces of polymer brush layers that act as a conductive network.The composite polymer electrolytes show a wide electrochemical window of approximately 4.5 V vs.Li^+/Li and excellent cycling performance retention of approximately 95%after 100 cycles at ambient temperature.The results also prove that surface groups of ceramic na noparticles are an important way to increase the electrochemical properties of composite polymer electrolytes. 展开更多
关键词 Polymer electrolyte Polymer brushes Solid batteries Nanoparticles Composite electrolyte
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Preparation of Au/Ag Multilayers via Layer-by-Layer Self-assembly in Spherical Polyelectrolyte Brushes and Their Catalytic Activity 认领 引用 被引量：2
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作者 Fei Zhao 李莉 +5 位作者 Yu-chuan Tian Jian-jia Liu Jian-jun Wang Zhi-ming Zhou 吕春祥 Xu-hong Guo 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2015年第10期1421-1430,共10页
Spherical polyelectrolyte brushes （SPBs） consisting of polystyrene （PS） core and poly（2-aminoethyl methacrylate hydrochloride） （PAEMH） shell were prepared by photo-emulsion polymerization. Au nanoparticles （A... Spherical polyelectrolyte brushes （SPBs） consisting of polystyrene （PS） core and poly（2-aminoethyl methacrylate hydrochloride） （PAEMH） shell were prepared by photo-emulsion polymerization. Au nanoparticles （Au-NPs） with controlled size and size distribution were synthesized in situ using SPBs as nanoreactors. Via layer-by-layer deposition technique on the surface of SPBs, nano-composite particles with Au/Ag-NPs bilayer and Au/Ag/Au-NPs trilayer were prepared. The structures of the as-prepared Au/Ag multilayer SPBs were characterized by UV-Vis spectroscopy, TEM, ICP-AES and DLS. The charge reversal of the nano-composite particles observed by zeta potential confirmed the success of layer-by-layer assembly. The Au/Ag-NPs bilayer nano-composite particles showed high catalytic efficiency with an apparent activation energy of about 41.2 kJ/mol in the reduction reaction of 4-nitrophenol to 4-aminophenol in the existence of sodium borohydride monitored. The catalytic activity ofAu/Ag-NPs multilayer SPBs close to that of Au-NPs SPBs and much higher than that of Ag-NPs SPBs reveals its potential applications in cost-effective catalysts with high-performance. 展开更多
关键词 Layer-by-layer self-assembly Spherical polyelectrolyte brushes Catalytic activity
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Biocompatible hierarchical zwitterionic polymer brushes with bacterial phosphatase activated antibacterial activity 认领 引用 被引量：1
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作者 Liwei Sun Lingjie Song +2 位作者 Xu Zhang Shuaishuai Yuan Shifang Luan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第31期191-202,共12页
Hierarchical polymer brushes have been considered as an effective and promising method for preventing implant-associated infections via multiple antibacterial mechanisms.Herein,a bacterial phosphatase re-sponsive surf... Hierarchical polymer brushes have been considered as an effective and promising method for preventing implant-associated infections via multiple antibacterial mechanisms.Herein,a bacterial phosphatase re-sponsive surface with hierarchical zwitterionic structures was developed for timely dealing with the poly-meric implant-associated bacterial infection.The hierarchical polymeric architecture was subtly realized on model polypropylene(PP)substrate by sequential photo living grafting of poly(2-(dimethylamino)ethyl methacrylate(PDMAEMA)bottom layer and zwitterionic poly(sulfobetaine methacrylate)(PSBMA)upper layer,followed by the conversion of the PDMAEMA into the zwitterionic structure via succes-sive quaternization and phosphorylation reactions.Owing to shielding the bottom polycations,the hi-erarchical zwitterionic polymer brushes guaranteed the surface with the optimal biocompatibility under the normal physiological environment.Once bacteria are invaded,the surface bactericidal activity of the bottom layer can be rapidly and automatically activated owing to the transition triggered by bacterial phosphatase from zwitterion to polycation.Additionally,ameliorated by the upper layer,the hierarchical surface showed obvious adhesion resistance to dead bacterial cells and notably migrated the cytotoxic-ity of exposed polycation after completion of the bactericidal task.As a proof-of-principle demonstration,this self-adaptive hierarchical surface with sensitive bacterial responsiveness and biocompatibility showed great potential in combating hernia mesh-related infection.This work provides a promising and universal strategy for the on-demand prevention of medical device-associated infections. 展开更多
关键词 Bacterial infection Self-adaptive surface Bactericidal Antifouling Hierarchical polymer brushes
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Heavy Metal Ions Removal by Nano-sized Spherical Polymer Brushes 认领 引用 被引量：1
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作者 Qing-chuan Chen 王杰 +3 位作者 Kai-min Chen Rui Zhang Li Li Xu-hong Guo 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2014年第4期432-438,共7页
Nano-sized spherical polymer brushes （SPBs） consisting of both a polystyrene （PS） core and a brush shell of poly（acrylic acid） （PAA）, poly（N-acrylcysteamine） （PSH）, or poly（N-acrylcysteamine-co-acrylic a... Nano-sized spherical polymer brushes （SPBs） consisting of both a polystyrene （PS） core and a brush shell of poly（acrylic acid） （PAA）, poly（N-acrylcysteamine） （PSH）, or poly（N-acrylcysteamine-co-acrylic acid） （P（SH-co-AA））, were prepared by photo-emulsion polymerization. The core-shell structure was observed by dynamic light scattering and transmission electron microscopy. Due to the strengthened Donnan effect, the PAA brush can adsorb heavy metal ions. Effects of the contact time, thickness of PAA brush and pH value on the adsorption results were investigated. Due to the coordination between the mercapto groups and heavy metal ions as well as the electrostatic interactions, SPBs with mercapto groups are capable to remove heavy metal ions selectively from aqueous solutions. The order of adsorption capacity of the heavy metal ions by SPBs with mercapto groups is： Hg2＋ ≈ Au3＋ 〉 Pb2＋ 〉 CH2＋ 〉 Ni2＋. The adsorbed heavy metal ions can be eluted from SPB by aqueous HCI solution, and the SPBs can be recovered. After three regenerations the recovered SPBs still maintain their adsorption capacity. 展开更多
关键词 Nano-sized spherical polymer brushes Photo-emulsion polymerization Heavy metal ions.
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Biofilm Disruption Utilizing α/β Chimeric Polypeptide Molecular Brushes 认领 引用 被引量：5
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作者 Si Zhang Xi-Mian Xiao +5 位作者 Fan Qi Peng-Cheng Ma Wei-Wei Zhang Cheng-Zhi Dai Dan-Feng Zhang Run-Hui Liu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2019年第11期1105-1112,共8页
Gram-negative bacteria can cause serious infections and are well known problems in biomedical practices. Biofilms of gramnegative bacteria are notorious for their frequently encountered resistance toward antibiotics. ... Gram-negative bacteria can cause serious infections and are well known problems in biomedical practices. Biofilms of gramnegative bacteria are notorious for their frequently encountered resistance toward antibiotics. We demonstrate that α/β chimeric polypeptide molecular brush (α/β CPMB) exerts potent activities against antibiotic-resistant gram-negative bacteria. MTT viability assay, bacterial colony counting, and live/dead staining all indicate that α/β CPMB not only inhibits biofilm formation of gram-negative Pseudomonas aeruginosa and Acinetobacter baumannii, but also effectively disrupts mature biofllms that are highly resistant to one of the most active antibiotics-colistin. The superior antibacterial performance of the α/β CPMB implies its potential topical applications in treating biofilms. 展开更多
关键词 Molecular brush Chimeric polypeptide Biofilm Antimicrobial resistance Host defense peptide
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From Self-assembled Monolayers to Chemically Patterned Brushes:Controlling the Orientation of Block Copolymer Domains in Films by Substrate Modification 认领 引用 被引量：4
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作者 Xiao-sa Jin Yuan-yuan Pang 季生象 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2016年第6期659-659,660-678,共1页
Block copolymer lithography is emerging as one of the leading technologies for patteming nanoscale dense features. In almost all potential applications of this technology, control over the orientation of cylindrical a... Block copolymer lithography is emerging as one of the leading technologies for patteming nanoscale dense features. In almost all potential applications of this technology, control over the orientation of cylindrical and lamellar domains is required for pattern transfer from the block copolymer film. This review highlights the state-of-art development of brushes to modify the substrates to control the assembly behaviors of block copolymers in films. Selected important contributions to the development of self-assembled monolayers, polymer brushes and mats, and chemically patterned brushes are discussed. 展开更多
关键词 Self-assembly Block copolymer Neutral brush Chemical pattern Wetting behavior.
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Controlled synthesis of silver nanoparticles from polyoxometalates-immobilized poly(4-vinylpyridine) brushes 认领 引用
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作者 Hang Bian Xuejian Zhang +1 位作者 Hongkai Zhao Ning Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2019年第5期1097-1099,共3页
This contribution reports the immobilization of polyoxometalate(POM)into poly(4-vinyl pyridine)(P4 VP)brushes and the controlled reduction of silver ions,in-situ generating metal nanoparticles in the brushes.P4 VP bru... This contribution reports the immobilization of polyoxometalate(POM)into poly(4-vinyl pyridine)(P4 VP)brushes and the controlled reduction of silver ions,in-situ generating metal nanoparticles in the brushes.P4 VP brushes were straightforwardly created by UV-assisted photopolymerization of 4-vinyl pyridine(4VP)on silicon or glass substrates.Phosphotungstic acid(H3 PW12 O40),one of the most widely used Keggin-type POM was anchored onto these pyridine moieties through electrostatic interaction,leading to the P4 VP/POM hybrid brushes.The immobilized POM was further reduced to heteropolyblue,which could be used to generate silver nanoparticles in a controlled fashion.AFM,UV-vis and IR characterization indicate that P4 VP brushes not only provide an efficient platform in the controlled preparation of Ag nanoparticles,but also efficiently disperse and stabilize POM,thus preventing the aggregation of the generated Ag nanoparticles. 展开更多
关键词 Polymer brushes Polyoxometalate Ag nanoparticles Grafting polymerization
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Molecular dynamics simulation of the response of bi-disperse polyelectrolyte brushes to external electric fields 认领 引用
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作者 张芬 丁欢达 +2 位作者 段超 赵双良 童朝晖 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第8期521-528,共8页
Langevin dynamics simulations have been performed to investigate the response of bi-disperse and strong polyacid chains grafted on an electrode to electric fields generated by opposite surface charges on the polyelect... Langevin dynamics simulations have been performed to investigate the response of bi-disperse and strong polyacid chains grafted on an electrode to electric fields generated by opposite surface charges on the polyelectrolyte （PE）-grafted electrode and a second parallel electrode. Simulation results clearly show that, under a negative external electric field, the longer grafted PE chains are more strongly stretched than the shorter ones in terms of the relative change in their respective brush heights. Whereas under a positive external electric field, the grafted shorter chains collapse more significantly than the longer ones. It was found that, under a positive external electric field, the magnitude of the total electric force acting on one shorter PE chain is larger than that on one longer PE chain, or vice versa. The effects of smeared and discrete charge distributions of grafted PE chains on the response of PE brushes to external electric fields were also examined. 展开更多
关键词 polyelectrolyte brushes electric fields polydispersity molecular dynamics
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Correlation between Conformation Change of Polyelectrolyte Brushes and Lubrication 认领 引用 被引量：5
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作者 Bin Li 于波 +2 位作者 Xiao-long Wang 郭峰 Feng Zhou 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2015年第1期163-172,共10页
We directly monitor the absolute separation profiles that function as film thickness between a single glass disk and the charged polyelectrolyte brushes decorated steel slider in water using a home-made slider-on-disk... We directly monitor the absolute separation profiles that function as film thickness between a single glass disk and the charged polyelectrolyte brushes decorated steel slider in water using a home-made slider-on-disk apparatus, which reflects the structural conformation variations and interactions of polymer brushes under externally applied pressure, in addition to probing the relative variation of friction forces under different applied loads and sliding velocities. We find that the polyelectrolyte brushes modified surfaces can sustain high pressure and have extremely low friction coefficients（around 0.006 at pressures of 0.13 MPa; 0.5-0.6 without brushes）. The water-lubrication characteristics are correlated to the structural conformation changes of the polyelectrolyte brushes that are mainly governed by electrostatic interactions and the osmotic pressure of counterions inside the polymer chains, which can be used to support and distribute the normal pressure. The apparent thickness of the brush decreases with the increase of loading forces, an increase in the ionic strength causes the polymer chains collapse, and the friction forces increase. This fundamental research is of great importance to understand the mechanical and structural properties of polyelectrolyte brushes and their influences on the tribological behaviors, and helps to design friction/lubrication-controlled surface/interface by taking advantage of polyelectrolyte brushes. 展开更多
关键词 Polyelectrolyte brush Lubrication Conformation Electrolyte.
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SYNTHESIS OF THERMO-AND pH-SENSITIVE POLYELECTROLYTE BRUSHES BY COMBINING THERMO-CONTROLLED EMULSION POLYMERIZATION AND PHOTO-EMULSION POLYMERIZATION 认领 引用 被引量：1
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作者 Xiang Wang Xu-hong Guo +3 位作者 Yan Zhu Li Li Shuang Wu Rui Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2011年第4期490-496,共7页
Bifunctional spherical polyelectrolyte brushes(SPBs)with tunable thermo-and pH-sensitivity are synthesized by combining therrno-controlled emulsion polymerization and photo-emulsion polymerization.They consist of a sp... Bifunctional spherical polyelectrolyte brushes(SPBs)with tunable thermo-and pH-sensitivity are synthesized by combining therrno-controlled emulsion polymerization and photo-emulsion polymerization.They consist of a spherical polystyrene core and a shell of mixed brushes of poly(N-isopropylacrylamide)(PNIPAM)and poly(acrylic acid)(PAA)whose composition can be easily modulated by the dose of monomers.The kinetics of SPB synthesis as well as their size change with temperature and pH is determined by dynamic light scattering(DLS).The scanning electron microscopy(SEM)images show that the bifunctional SPBs have a defined spherical morphology with a narrow size distribution. 展开更多
关键词 Spherical polyelectrolyte brush Thermo-sensitive pH-responsive.
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