电解解离氢键层层组装薄膜
利用电解解离的方法研究层层组装氢键复合薄膜聚(2-乙基-2噁唑啉)/聚丙烯酸(PEOX/PAA)的解离行为,将制备在导电氧化铟锡玻璃(ITO)上的薄膜放置于电解池的正极进行解离,得到均匀平坦而非粗糙的薄膜。通过衰减全反射(ATR)和循环伏安法(CV)的分析说明,引起氢键薄膜解离的是正极附近形成的pH梯度区间,该区间靠近电极呈酸性、远离电极呈碱性。此外,对比薄膜在电解池正负极的解离行为,进一步证明正负极附近形成的不同pH梯度区间将导致薄膜解离形貌和厚度差异的产生。电解液的pH以及电解电压均影响氢键薄膜在正极的解离行为,通过分析提出了一个较为适宜的电解解离条件。...
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| Published in | 功能高分子学报 Vol. 31; no. 1; pp. 20 - 27 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
东华大学材料科学与工程学院 ,纤维材料改性国家重点实验室 ,东华大学先进低维材料中心,上海201620
2018
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1008-9357 |
| DOI | 10.14133/j.cnki.1008-9357.20171021001 |
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| Abstract | 利用电解解离的方法研究层层组装氢键复合薄膜聚(2-乙基-2噁唑啉)/聚丙烯酸(PEOX/PAA)的解离行为,将制备在导电氧化铟锡玻璃(ITO)上的薄膜放置于电解池的正极进行解离,得到均匀平坦而非粗糙的薄膜。通过衰减全反射(ATR)和循环伏安法(CV)的分析说明,引起氢键薄膜解离的是正极附近形成的pH梯度区间,该区间靠近电极呈酸性、远离电极呈碱性。此外,对比薄膜在电解池正负极的解离行为,进一步证明正负极附近形成的不同pH梯度区间将导致薄膜解离形貌和厚度差异的产生。电解液的pH以及电解电压均影响氢键薄膜在正极的解离行为,通过分析提出了一个较为适宜的电解解离条件。 |
|---|---|
| AbstractList | O63; 利用电解解离的方法研究层层组装氢键复合薄膜聚(2-乙基-2噁唑啉)/聚丙烯酸(PEOX/PAA)的解离行为,将制备在导电氧化铟锡玻璃(ITO)上的薄膜放置于电解池的正极进行解离,得到均匀平坦而非粗糙的薄膜.通过衰减全反射(A T R)和循环伏安法(C V)的分析说明,引起氢键薄膜解离的是正极附近形成的pH梯度区间,该区间靠近电极呈酸性、远离电极呈碱性.此外,对比薄膜在电解池正负极的解离行为,进一步证明正负极附近形成的不同pH梯度区间将导致薄膜解离形貌和厚度差异的产生.电解液的pH以及电解电压均影响氢键薄膜在正极的解离行为,通过分析提出了一个较为适宜的电解解离条件. 利用电解解离的方法研究层层组装氢键复合薄膜聚(2-乙基-2噁唑啉)/聚丙烯酸(PEOX/PAA)的解离行为,将制备在导电氧化铟锡玻璃(ITO)上的薄膜放置于电解池的正极进行解离,得到均匀平坦而非粗糙的薄膜。通过衰减全反射(ATR)和循环伏安法(CV)的分析说明,引起氢键薄膜解离的是正极附近形成的pH梯度区间,该区间靠近电极呈酸性、远离电极呈碱性。此外,对比薄膜在电解池正负极的解离行为,进一步证明正负极附近形成的不同pH梯度区间将导致薄膜解离形貌和厚度差异的产生。电解液的pH以及电解电压均影响氢键薄膜在正极的解离行为,通过分析提出了一个较为适宜的电解解离条件。 |
| Abstract_FL | Disassembly of hydrogen bonded layer-by-layer (LbL ) film , composed of poly (acrylic acid ) (PAA) and poly (2-ethyl-2-oxazoline) (PEOX) ,is studied by an electrochemical stimulus .Poly (2-oxazoline)s have been widely studied for biomedical applications due to their biocompatibility ,thermal responsive behavior and easy chemical modification . Nowadays , one emerging research area for the development of biomedicine and gene engineer focuses on the controlled dissolution of LbL assemblies .A new method to trigger the hydrogen bonded LbL film dissolution near the positive electrode in the electrolytic bath is reported ,which can obtain a uniform and transparent film .Through the analysis of Fourier Transform Infrared Attenuated Total Reflection (FTIR-ATR) and Cyclic Voltammetry (CV) ,the pH gradient range which is induced by the electrolysis of water is pointed out .Near the positive electrode , OH -ions moved to the electrode and H+ ions produced by electrolysis of water form a pH gradient range which resulting in the closer to electrode ,the lower the pH value .Hence ,the higher pH value induces the dissolution of hydrogen bonded film .Of course ,for the negative electrode ,the pH gradient range is the opposite .Then ,comparing the film disintegrated near the positive and negative electrode ,the pH gradient range makes a big contribution to the dissolution process and results in different morphology and thickness of multilayers . For the hydrogen bonded film on the positive electrode , it takes more time to electrochemically dissolve than the film on the negative electrode .However ,the transparency of film on positive electrode is higher than that on negative electrode . Here , the transparency is related to the different ways of film dissolution rather than the disassembled speed .Two different pH gradient ranges induce different disassembled ways that on the positive electrode the film dissolves from outside to inside , and on the negative electrode the film dissolves from inside to outside .The former film always keeps a transparent and uniform topography and the latter film exhibits a cloud and microporous surface . In addition ,the pH value affects the stability of hydrogen bond and property of pH gradient range .Results show that the lower pH value is beneficial for the dissolution of film ,because the lower pH value can lead the ionic strength in solution to be higher and higher ionic strength allows the electrical conductivity of the solution to be better .Rapid electrolysis of water is able to generate more H + ions on the surface of positive electrode and move more OH -ions towards the electrode .These two activities let the pH gradient range be able to achieve much stronger acidic and alkaline , which promotes the film dissolution . The applied electrical potential influences the current in the electrolytic bath :higher electrical potential corresponds to higher current and leads to faster dissociation speed .Besides ,the proper condition for film dissolution is electrolyte pH = 4 , applied potential 4 V , and the current about 25 μA . Under this condition , the disassembled speed of film is relatively faster , and the film does not appear cracks but a stable and sustained dissolution . |
| Author | 苏超;杨曙光 |
| AuthorAffiliation | 东华大学材料科学与工程学院,纤维材料改性国家重点实验室,东华大学先进低维材料中心,上海201620 |
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| Author_FL | SU Chao YANG Shu-guang |
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| Author_xml | – sequence: 1 fullname: 苏超;杨曙光 |
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| DOI | 10.14133/j.cnki.1008-9357.20171021001 |
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| DocumentTitleAlternate | Electrodissolution of Hydrogen Bonded Layer-by-Layer Film |
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| Keywords | pH梯度区间 氢键 pH gradient range layer-by-layer film electrodissolution 电解解离 层层组装膜 hydrogen bond |
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| Notes | Disassembly of hydrogen bonded layer-by-layer(LbL)film,composed of poly(acrylic acid)(PAA)and poly(2-ethyl-2-oxazoline)(PEOX),is studied by an electrochemical stimulus.Poly(2-oxazoline)s have been widely studied for biomedical applications due to their biocompatibility,thermal responsive behavior and easy chemical modification.Nowadays,one emerging research area for the development of biomedicine and gene engineer focuses on the controlled dissolution of LbL assemblies.A new method to trigger the hydrogen bonded LbL film dissolution near the positive electrode in the electrolytic bath is reported,which can obtain a uniform and transparent film.Through the analysis of Fourier Transform Infrared Attenuated Total Reflection(FTIR-ATR)and Cyclic Voltammetry(CV),the pH gradient range which is induced by the electrolysis of water is pointed out.Near the positive electrode,OH-ions moved to the electrode and H+ions produced by electrolysis of water form a pH gradient range which resulting in the closer to electrode,th |
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| PublicationTitle | 功能高分子学报 |
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| Publisher | 东华大学材料科学与工程学院 ,纤维材料改性国家重点实验室 ,东华大学先进低维材料中心,上海201620 |
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| Snippet | 利用电解解离的方法研究层层组装氢键复合薄膜聚(2-乙基-2噁唑啉)/聚丙烯酸(PEOX/PAA)的解离行为,将制备在导电氧化铟锡玻璃(ITO)上的薄膜放置于电解池的正极进行解离,得到... O63; 利用电解解离的方法研究层层组装氢键复合薄膜聚(2-乙基-2噁唑啉)/聚丙烯酸(PEOX/PAA)的解离行为,将制备在导电氧化铟锡玻璃(ITO)上的薄膜放置于电解池的正极进行解离,... |
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| SubjectTerms | 层层组装膜;氢键;电解解离;pH梯度区间 |
| Title | 电解解离氢键层层组装薄膜 |
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