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Nanopore-based Manipulation and Separation of Single-stranded DNA Molecules through Tuning pH Values 认领 引用
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作者 Cheng-Kai Zhou Sheng-Wen Miao Li-Zhen Sun 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第7期2361-2369,共9页
The unique regulatory effect of pH on electrostatic interactions offers a powerful approach for manipulating and separating singlestranded DNA(ssDNA)molecules.In this study,we employ Langevin dynamics simulations to i... The unique regulatory effect of pH on electrostatic interactions offers a powerful approach for manipulating and separating singlestranded DNA(ssDNA)molecules.In this study,we employ Langevin dynamics simulations to investigate the translocation dynamics of two ssDNAs,poly(dA)and poly(dT),through a silicon nitride nanopore under acidic conditions.The key distinction between the two chains is their different pH-dependent protonation.At low pH,the highly protonated adenine bases experience repulsive interactions from the similarly protonated nanopore surface and the retarding force from the external voltage,whereas neutral thymine bases do not.Consequently,compared to poly(dT),poly(dA)exhibits a lower capture probability and slower translocation speed under strongly acidic conditions.However,the difference in the translocation behaviors between the two chains gradually diminishes as the pH increases.Based on their distinct pH-dependent behaviors,poly(dA)and poly(dT)of identical length can be successfully separated through the translocation strategy at low pH,even when they are initially mixed on the same side of the nanopore. 展开更多
关键词 Single-stranded DNA Nanopore translocation Electrostatic interaction pH value Langevin dynamics simulation
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PH Value 2026:A forward‑looking roadmap for knitting 认领 引用
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作者 Qiu Shuchen 《China Textile》 2026年第2期20-21,共2页
2026 marks the beginning of the"15th Five-Year Plan"period,ushering in a new phase for China's knitting industry.The 2026 PH Value China International Knitting Fair(Spring Edition)(hereinafter referred t... 2026 marks the beginning of the"15th Five-Year Plan"period,ushering in a new phase for China's knitting industry.The 2026 PH Value China International Knitting Fair(Spring Edition)(hereinafter referred to as the 2026 PH Value Knitting Fair),the first major exhibition of the year for the knitting industry,was held from March 11 to 13 at Hall 3 of the National Exhibition and Convention Center(Shanghai). 展开更多
关键词 ph value knitting industry Shanghai five year plan China International Knitting Fair
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Study on pH Value Detection of Silage Corn Feed Based on Micro Near Infrared Spectrometer 认领 引用
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作者 Xiao Li Wenjing Zhu Changfeng Shao 《Journal of Electronic Research and Application》 2026年第2期237-245,共9页
Silage corn feed is an important source of roughage for cattle and sheep breeding.Its pH value can quickly reflect the quality of feed and is one of the main indicators for evaluating the fermentation quality of feed.... Silage corn feed is an important source of roughage for cattle and sheep breeding.Its pH value can quickly reflect the quality of feed and is one of the main indicators for evaluating the fermentation quality of feed.In this study,the pH value of silage corn feed was non-destructively and rapidly detected based on near-infrared spectroscopy analysis technology.The silage corn feed of dairy farms in Tai’an City,Shandong Province was taken as the research object.The spectra of 855~1890 nm of samples were collected based on a miniature near-infrared spectroscopy acquisition system,and the pH value prediction model of silage corn feed was established by combining chemometrics methods.Firstly,a miniature near-infrared spectroscopy acquisition system was introduced.The system was used to collect the near-infrared spectral data of 260 silage corn feed samples.The near-infrared spectral data were preprocessed by standard normal transformation,moving mean filtering,and multiple scattering correction.The wavelength was optimized by algorithms such as elimination of uninformative variables,competitive adaptive reweighted sampling algorithm,and variable iterative space shrinkage.The support vector regression(SVR)model based on snake optimization(SO)was used.The model was established by combining the pH value of the leaching solution of silage corn feed with the pH meter.The results show that the full-band modeling based on multiple scattering correction(MSC)pretreatment is the best,the modeling effect of the characteristic wavelength selected based on variable iterative space shrinkage approach(VISSA)is the best,and the modeling effect of MSC-VISSA-SO-SVR model is the best,and the correction correlation coefficient is 0.990531.The corrected root mean square error is 0.083545,the predicted correlation coefficient is 0.980487,and the predicted root mean square error is 0.127718.The results of this study show that the combination of MSC-VISSA-SO-SVR model based on micro near-infrared spectroscopy acquisition system can provide a reference for non-destructive detection of pH value of silage corn feed by near-infrared spectroscopy. 展开更多
关键词 Near infrared spectroscopy Silage corn feed pH value Characteristic wavelength
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2026 PH Value春夏展 春启新元 织梦未来 认领 引用
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作者 梁龙 《中国纺织》 2026年第3期20-21,共2页
作为中国纺联春季联展的重要组成之一,日前,2026 PH Value中国国际针织(春夏)博览会(以下简称:2026 PH Value春夏针织展)在国家会展中心(上海)3号馆盛大启幕。本次展会,以10000+m2展示空间,集结近200家针织领军企业。这些针织力量的... 作为中国纺联春季联展的重要组成之一,日前,2026 PH Value中国国际针织(春夏)博览会(以下简称:2026 PH Value春夏针织展)在国家会展中心(上海)3号馆盛大启幕。本次展会,以10000+m2展示空间,集结近200家针织领军企业。这些针织力量的同台竞技,让我们看到了针织创意开花结果的繁荣盛景。 展开更多
关键词 2026 PH Value春夏展
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Influence of pH value on corrosion behavior of non-equiatomic Fe40Mn20Cr20Ni20 high-entropy alloy 认领 引用
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作者 Zhen Wang Jun-feng Duan +2 位作者 Jun-wei Qiao Hong-yan Che Xi-kou He 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第4期1114-1124,共11页
The electrochemical performance and corrosion properties of Fe40Mn20Cr20Ni20 high-entropy alloys(HEAs)in a 3.5%NaCl solution with various pH values were thoroughly investigated.The results revealed a close... The electrochemical performance and corrosion properties of Fe40Mn20Cr20Ni20 high-entropy alloys(HEAs)in a 3.5%NaCl solution with various pH values were thoroughly investigated.The results revealed a close correlation between the corrosion properties of HEAs and the pH value.On the one hand,the pH value can affect the semiconducting properties of the passive film on the alloy surfaces,thereby further influencing the protective capacity of the passive film.On the other hand,an excess of H+or OH−promotes the growth of localized corrosion,facilitating the formation of a larger number of larger-sized localized corrosion pits.Ultimately,the corrosion of HEAs is most severe in acidic solutions. 展开更多
关键词 Fe40Mn20Cr20Ni20alloy Corrosion mechanism High-entropy alloy pH value Passive film
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2025PH Value春夏针织展:唱响时尚针织升级新篇章 认领 引用
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作者 梁龙 《中国纺织》 2025年第3期22-23,共2页
今年2025PH Value国际针织(春夏)博览会(以下简称:2025 PH Value春夏针织展)在10000平方米的展示空间中,汇聚了160余家针织行业翘楚,以新产品、新技术、新趋势,书写春色满园里的花开画卷,唱响针织领域升级的时代新篇。聚合看名企集群百... 今年2025PH Value国际针织(春夏)博览会(以下简称:2025 PH Value春夏针织展)在10000平方米的展示空间中,汇聚了160余家针织行业翘楚,以新产品、新技术、新趋势,书写春色满园里的花开画卷,唱响针织领域升级的时代新篇。聚合看名企集群百花齐放开展首日,针织衫/羊毛衫/羊绒衫、针织时装、内衣/休闲装、针织饰品、趋势研发机构及平台等不同品类的知名针织企业、集群,共同向我们展现了姹紫嫣红、百花齐放的针织画卷。 展开更多
关键词 2025PH Value 新产品 新技术 羊毛衫
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PH Value义乌展:万物可织“义”卖全球 认领 引用
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作者 梁龙 《中国纺织》 2025年第3期44-44,共1页
在2025 PH Value春夏针织展期间,2025中国(义乌)国际针织供应链博览会推介会同期举行。义乌作为全球小商品集散中心,拥有得天独厚的产业优势和国际贸易资源,而PH Value针织展,则始终致力于促进国内外针织行业交流与合作,不断推动行业技... 在2025 PH Value春夏针织展期间,2025中国(义乌)国际针织供应链博览会推介会同期举行。义乌作为全球小商品集散中心,拥有得天独厚的产业优势和国际贸易资源,而PH Value针织展,则始终致力于促进国内外针织行业交流与合作,不断推动行业技术创新、品牌提升和市场拓展。当PH Value遇见义乌,这不仅是一场资源的互动、商机的共享,也是义乌这座商贸名城与针织产业深度融合的重要标志,更是为行业高质量发展、企业做优做强,一起携手应变局、育新机、开新局的创新举措。 展开更多
关键词 技术创新 品牌提升 PH Value
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2025 PH Value秋冬针织展:“智”启未来心“织”所向 认领 引用
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《中国纺织》 2025年第9期22-23,共2页
发现行业数智风向,洞见市场消费趋势,把脉零售流量密码……随着2025 PH Value中国国际针织(秋冬)博览会的盛大启幕,关于展会多维赋能的期盼,也在海量汇入的专业针织买家及展商们的内心萌发。名企荟萃产业欣欣向荣2025 PH Value秋冬针织... 发现行业数智风向,洞见市场消费趋势,把脉零售流量密码……随着2025 PH Value中国国际针织(秋冬)博览会的盛大启幕,关于展会多维赋能的期盼,也在海量汇入的专业针织买家及展商们的内心萌发。名企荟萃产业欣欣向荣2025 PH Value秋冬针织展以14000平米展示空间,特别划分聚焦针织服装服饰的“臻品智造”展区,主打内衣、家居服与袜品的“肌理诗篇”展区,以运动休闲品类为核心的“型动空间”展区,以及重点呈现功能性针织产品及趋势的“材料美学”展区。四大主题展区汇聚近200家针织品牌和制造商,共同描绘产业欣欣向荣、奋跃向上的生动姿态。 展开更多
关键词 2025 PH Value 秋冬
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“义”气风发扬帆出海--2025PH VALUE义乌展热烈启幕 认领 引用
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作者 梁龙 《中国纺织》 2025年第5期118-119,共2页
近日,2025中国(义乌)国际针织供应链博览会(简称:PH VALUE义乌展),在义乌国际博览中心热烈启幕!作为针织行业的品牌专业展会,PH VALUE针织展为探索“出海新商机”全新开辟的新站点,2025PH VALUE义乌展获得了海内外专业买家的云集响应。... 近日,2025中国(义乌)国际针织供应链博览会(简称:PH VALUE义乌展),在义乌国际博览中心热烈启幕!作为针织行业的品牌专业展会,PH VALUE针织展为探索“出海新商机”全新开辟的新站点,2025PH VALUE义乌展获得了海内外专业买家的云集响应。首日会场宾客满堂,来自百余个国家和地区、尤其是“一带一路”沿线的海外客商,以及国内市场的大牌买家们蜂拥而至。 展开更多
关键词 针织供应链博览会 2025PH VALUE义乌展
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Morphology and photocatalytic performance of nano-sized TiO_2 prepared by simple hydrothermal method with different pH values 认领 引用 被引量：13
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作者 Hao Xu Shi-Qi Liu +5 位作者 Shan Zhou Tang-Zhi-Jiu Yuan Xiang Wang Xia Tang Jian Yin Hui-Jin Tao 《Rare Metals》 SCIE EI CAS CSCD 2018年第9期750-758,共9页
pH value is a key factor in the preparation of nano-sized TiO2 with hydrothermal method. Using Ti（SO4）2 as the titanium source, H2O2 as the complexing agent, NaOH and HCl as the pH value regulator, nano- sized TiO2 ... pH value is a key factor in the preparation of nano-sized TiO2 with hydrothermal method. Using Ti（SO4）2 as the titanium source, H2O2 as the complexing agent, NaOH and HCl as the pH value regulator, nano- sized TiO2 powder with various morphologies and sizes was synthesized. Changes in morphology, size and phase type with pH values of samples were characterized by X-ray diffraction （XRD） and transmission electron micro- scopy （TEM） measurements. Results show that under the present preparation conditions, TiO2 powder is an anatase phase with pH value less than 11, but is more likely to be a brookite phase with pH value more than 11. With the increase in pH value from 1 to 11 in hydrothermal envi- ronment, nano-sized anatase TiO2 gradually grows up in all directions. {001 }, { 101 } and { 100} groups of crystal plane are the exposed crystal planes of nano-sized anatase TiO2 for the （004）, （101） and （200） facets found in high-reso- lution TEM image. The photocatalytic performance of nano-sized TiO2 with different morphologies was com- pared by measuring their photocatalytic degradation rates for methylene blue under ultraviolet light. Results show that anatase TiO2 prepared under the alkalescenthydrothermal environment （pH = 9, 11） has a better pho- tocatalytic degrading performance. Different sizes and phases of nanoscaled TiO2 powders with different photo- catalytic performances can be prepared by the control of pH value of hydrothermal solutions. 展开更多
关键词 Hydrothermal method pH value Anatase Brookite Nano-sized crystal morphology
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Effect of pH values on extracellular protein and polysaccharide secretions of Acidithiobacillus ferrooxidans during chalcopyrite bioleaching 认领 引用 被引量：10
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作者 余肇璟 余润兰 +4 位作者 刘阿娟 刘晶 曾伟民 刘学端 邱冠周 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第2期406-412,共7页
The effect of pH values on the extracellular protein and polysaccharide secretions of Acidithiobacillus ferrooxidans was comparatively investigated in different phases of bacterial growth during chalcopyrite bioleachi... The effect of pH values on the extracellular protein and polysaccharide secretions of Acidithiobacillus ferrooxidans was comparatively investigated in different phases of bacterial growth during chalcopyrite bioleaching. The results indicate that the extracellular protein is always more than the extracellular polysaccharide secreted by attached cells on the chalcopyrite, on the contrary, and is always less than the extracellular polysaccharide secreted by free cells in the solution at bacterial adaptive phase, logarithmic phase and stationary phase whenever pH value is at 1.0, 1.5, 2.0 or 2.5; free cells are mainly through the secretion of extracellular polysaccharide rather than the extracellular protein to fight against disadvantageous solution environment, such as high concentration of metal ions and unsuitable pH solution; both amounts of polysaccharide and protein secreted by attached cells are mainly positively related to the solution acidity rather than the total concentration of soluble metal ions. The experimental results imply that bacteria are mainly through secreting more extracellular polysaccharide to fight against disadvantageous environment and the extracellular protein perhaps plays an important role in oxidation？reduction reactions in the bioleaching system. 展开更多
关键词 extracellular protein Acidithiobacillus ferrooxidans chalcopyrite bioleaching pH value
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Influence of pH value on properties of YPO_4:Tb3+ phosphor by co-precipitation method 认领 引用 被引量：8
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作者 李旭 王皓岩 +6 位作者 关丽 付跃举 郭镇 袁坤生 铁利成 杨志平 滕枫 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第4期346-349,共4页
A series of Y1_xPO4：xTb3＋ （x=0.005-0.1） phosphors were successfully fabricated by using co-precipitation method with NHzH2PO4 as phosphorus source. The structure and morphology characterization of the luminescent ... A series of Y1_xPO4：xTb3＋ （x=0.005-0.1） phosphors were successfully fabricated by using co-precipitation method with NHzH2PO4 as phosphorus source. The structure and morphology characterization of the luminescent material was investigated with X-ray powder diffraction （XRD） and field emission scanning electron microscopy （FESEM）. The XRD patterns indicated that the samples belonged to tetragonal phase. Luminescence properties were discussed by measuring the excitation and emission spectra. The phosphor could be excited by UV light （340-390 nm） and emitted green light, with the emission peaks located at 491 （5Da→7F6）, 550 （SD4→7Fs）, 589 （5D4→7F4） and 624 nm （SD4→TF3）. In addition, the pH value and activator concentration had great effects on the emission intensity. The results illuminated that this phosphor could be used for UV based white light emitting diodes and co-precipitation method could be used to prepare better appearance phosphor. 展开更多
关键词 luminescence phosphor co-precipitation pH value rare earths
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Corrosion behaviour of die-cast AZ91D magnesium alloys in sodium sulphate solutions with different pH values 认领 引用 被引量：9
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作者 田赟 杨丽景 +4 位作者 李艳芳 卫英慧 侯利锋 李永刚 Ri-Ichi MURAKAMI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期912-920,共9页
The corrosion behaviours of die-cast AZ91D magnesium alloys were investigated in 0.1 mol/L sodium sulphate （Na 2 SO 4 ） solutions with different pH values. The corrosion rates, morphologies, and compositions of the ... The corrosion behaviours of die-cast AZ91D magnesium alloys were investigated in 0.1 mol/L sodium sulphate （Na 2 SO 4 ） solutions with different pH values. The corrosion rates, morphologies, and compositions of the corrosion products were studied by means of scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR）, and X-ray diffractometry （XRD）. The results indicate that the order of corrosion rates in Na 2 SO 4 solutions with various pH values is pH 2pH 4pH 7pH 9pH 12. The corrosion rates in acidic solutions are higher than those in alkaline solutions, and the corrosion products are mainly magnesium hydroxide （Mg（OH） 2 ） and hydrated sulphate pickeringite （MgAl 2 （SO 4 ） 4 ·22H 2 O）. The results also indicate that the solution pH can influence the corrosion rate and morphology of corrosion products. Chloride ions and sulphate ions have different pitting initiation time. 展开更多
关键词 magnesium alloy corrosion sodium sulphate pH value
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Correspondence between Susceptibility to SCC of 7050 Aluminum Alloy and Passive Film-induced Stress at Various pH Values 认领 引用 被引量：7
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作者 祁星 宋仁国 +4 位作者 QI Wenjuan JIN Jirong WANG Chao LI Hai SUN Bin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第1期173-178,共6页
The passive film-induced stress and the susceptibility to SCC of 7050 aluminum alloy in 3.5%sodium chloride solution at various pH values were investigated by slow strain rate testing（SSRT） and flowing stress differ... The passive film-induced stress and the susceptibility to SCC of 7050 aluminum alloy in 3.5%sodium chloride solution at various pH values were investigated by slow strain rate testing（SSRT） and flowing stress differential method.The results showed that the passive film-induced stress and the susceptibility to SCC decreased with increasing pH values when pH≤7,while they increased with increasing pH values when pH7.However,the corrosion type was interpreted as exfoliation corrosion when pH=l and 14,and there was no film formed on the surface of the specimens.The whole variation plots of film-induced stress and the SCC susceptibility with pH values were both presented as a valley shape.The symbol and amount of the film-induced stress were related to the compositions of the passive film,which were analyzed using X-ray photoelectron spectroscopy（XPS）. 展开更多
关键词 7050 aluminum alloy susceptibility to SCC pH value passive film-induced stress
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Influence of pH value and chelating reagent on performance of Li_3V_2(PO_4)3/C cathode material 认领 引用 被引量：7
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作者 向伟 唐艳 +4 位作者 王雁英 钟本和 方为茂 刘恒 郭孝东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1395-1402,共8页
The Li3V2（PO4）3/C composite cathode material was synthesized via sol-gel method using three different chelating agents （citric acid, salicylic acid and polyacrylic acid） at pH value of 3 or 7. The crystal structur... The Li3V2（PO4）3/C composite cathode material was synthesized via sol-gel method using three different chelating agents （citric acid, salicylic acid and polyacrylic acid） at pH value of 3 or 7. The crystal structure, morphology, specific surface area and electrochemical performance of the prepared samples were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and galvanostatic charge/discharge test. The results show that the effects of pH value on the performance of the prepared materials are greatly related to the chelating agents. With salicylic acid or polyacrylic acid as the chelating reagent, the structure, morphology and electrochemical performance of the samples are greatly influenced by the pH values. However, the structure of the materials with citric acid as the chelating agent does not change as pH value changes, and the materials own uniform particle size distribution and good electrochemical performance. It delivers an initial discharge capacity of 113.58 mA·h/g at 10C, remaining as high as 108.48 mA·h/g after 900 cycles, with a capacity retention of 95.51%. 展开更多
关键词 Li3V2（PO4）3 cathode material sol-gel method chelating agents pH value
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Chloride content and pH value in the pore solution of concrete under carbonation 认领 引用 被引量：10
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作者 Xiao-mei WAN Folker H. WITTMANN +1 位作者 Tie-jun ZHAO Hong FAN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2013年第1期71-78,共8页
Chloride content and the pH value of the pore solution in the neighborhood of steel reinforcement are decisive pa- rameters for initiation and rate of corrosion. The pore solution of cement mortar and hardened cement ... Chloride content and the pH value of the pore solution in the neighborhood of steel reinforcement are decisive pa- rameters for initiation and rate of corrosion. The pore solution of cement mortar and hardened cement paste has been expressed from the pore space by high pressure in the investigation. The influence of the water-cement ratio, age, and addition of chloride to the fresh mix on chloride content in the pore solution has been determined by ion chromatography. At the same time the pH value of the pore solution has been determined. The dissolved chloride content decreases with increase in the water-cement ratio. The amount of bound chloride increases with time, but it decreases with decreasing content of dissolved chloride in the pore solution. A significant influence of carbonation on the dissolved chloride content of the pore solution has been observed. With complete carbonation, the dissolved chloride content in cement mortar and hardened cement paste increases by a factor between 2 and 12. The bound chloride decreases by 27%--54%. As expected, the pH value decreases from around 13.2 to as low as 8.0 due to car- bonation. It can be concluded that carbonation not only lowers the pH value but liberates bound chloride. This is one obvious reason why the combined action of chloride penetration and carbonation accelerates steel corrosion and shortens the service life of reinforced concrete structures. 展开更多
关键词 Chloride Pore solution Carbonation pH value
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Effect of solution pH value changes on fluorescence intensity of magnetic-luminescent Fe3O4@Gd2O3:Eu^3+ nanoparticles 认领 引用 被引量：3
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作者 吴拓 潘桦滟 +5 位作者 陈如标 罗东 张宏 沈晔 李旸晖 王乐 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第1期71-76,共6页
In this paper, bifunctional Fe3O4@Gd203：Eu3＋ core-shell nanoparticles with both magnetic and fluorescent properties were synthesized through a urea homogeneous precipitation （UHP） method. Particular emphasis was p... In this paper, bifunctional Fe3O4@Gd203：Eu3＋ core-shell nanoparticles with both magnetic and fluorescent properties were synthesized through a urea homogeneous precipitation （UHP） method. Particular emphasis was placed on investigating the influence of the solution pH value on the photoluminescence of the core-shell nanocomposites. It showed that the samples treated at the solution of pH=3.0 had the highest luminescence due to the enhanced crystallinity and size tmiformity of nanoparticles. The Fe3O4@Gd2O3：Eu3＋ nanocomposites exhibited an almost spherical shape with a mean diameter of 60 nm, and had strong red emissions of Eu3＋ at 612 nm as well as good magnetization with the saturation magnetization of 1.29 emu/g. It thus indicated that the core-shell nanocomposites investigated has great potential in biomedical applications. 展开更多
关键词 nanocomposites pH value magnetic properties luminescence properties rare earths
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Microstructure of nano precursors of La-Mg hydrogen storage alloy synthesized by sol-gel technology at different pH values 认领 引用 被引量：3
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作者 WANG Dahui XIA Jihong ZHANG Sha 《Rare Metals》 SCIE EI CAS CSCD 2012年第5期466-469,共4页
Sol-gel technology was employed to synthesize nanosized precursors of La-Mg hydrogen storage alloy at different pH values(0.5,1.5,8.0 and 9.0)of reaction solution.The effect of pH value on microstructure of the nano p... Sol-gel technology was employed to synthesize nanosized precursors of La-Mg hydrogen storage alloy at different pH values(0.5,1.5,8.0 and 9.0)of reaction solution.The effect of pH value on microstructure of the nano precursors of La-Mg hydrogen storage alloy was studied by infrared radiation(IR),thermo-gravimetric and differential thermal analysis(TG/DTA),X-ray diffraction analyzer(XRD)and transmission electron microscopy(TEM).IR results indicate that the chelating agent,citric acid,is not fully ionized,and carboxyl groups are not entirely used to complex metal ions in acidic solutions.The efficiency of complexing metal ions is enhanced in basic solutions.TG/DTA results show that the combustion may take place with low rate of the flame propagation that causes the longer combustion time when pH<1.5.On the contrary,the dry gel synthesized in basic solution combusts at low ignition temperature and combustion reaction is violent;it is easy to form fine particles.XRD and TEM results reveal that the precursor powders are mainly two-phase mixture of La 2 O 3 and MgO.The morphology of the particles is almost flake with the size of~30 nm when pH is 8.0. 展开更多
关键词 pH value microstructure nano precursors sol-gel technology
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Effect of Micro-Area pH Value on Formation of Different Rust Phases of Weathering Steel in Initial Corrosion Period 认领 引用 被引量：2
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作者 CHEN Xiao-ping WANG Xiang-dong +3 位作者 LIU Qing-you MI Feng-yi CHEN Ying LI Yu-su 《Journal of Iron and Steel Research International》 SCIE CAS 2010年第9期69-72,78,共4页
The formation of protective rust layer of atmospheric corrosion resistance was discussed for weathering steel.The rust layers of experimental steels were made by using an accelerating industrial atmospheric corrosion ... The formation of protective rust layer of atmospheric corrosion resistance was discussed for weathering steel.The rust layers of experimental steels were made by using an accelerating industrial atmospheric corrosion test of dry-wet cyclic immersion.Furthermore XRD were used to measure and analyze the rust layers.The initial corrosion processes below thin water film were observed and the changes of micro-area pH value were measured.The results are as follows:The corrosion processes of P-RE weathering steel are obviously different from those of carbon steel.The surface of P-RE weathering steel rapidly forms a-FeOOH and the micro-area pH value is above 5.4 during the initial corrosion period.While the component of the rust layer for the carbon steel is mainly Fe3O4 and the microarea pH value is below 3.8. 展开更多
关键词 weathering steel pH value micro area rust phase
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Influence of pH Value on Photocatalytic Activity of Bi4Ti3O12 Crystals Obtained by Hydrothermal Method 认领 引用 被引量：1
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作者 林雪 宫宇宁 +2 位作者 张耀丹 闫永胜 关庆丰 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2014年第2期209-213,I0004,共5页
Bi4Ti3O12 （BIT） crystals were controllably synthesized via a facile hydrothermal process without adding any surfactant or template. The morphologies of BIT with nanosphere, nanoplate, nanobelt, and nanosheet can be ... Bi4Ti3O12 （BIT） crystals were controllably synthesized via a facile hydrothermal process without adding any surfactant or template. The morphologies of BIT with nanosphere, nanoplate, nanobelt, and nanosheet can be selectively obtained by adjusting the pH value of the reactant. The formation mechanisms of these distinctive morphologies were then discussed based on the structural analysis of samples obtained at different pH values. BIT sample prepared at pH=1 showed the highest photocatalytic activity under visible light irradiation. The photocatalytic activities difference for the BIT samples synthesized at different pH values was studied based on their shape, size, and the variation of local structure. 展开更多
关键词 Photocatalysis Bi4Ti3O12 pH value Local structure
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