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Clay-protein ultrathin films:Design and bio-catalytic performance study

Science China Chemistry 2012年第7期55卷 1842-1855页

作者： MIAO ShiDing QIU ZhiGuo CUI Peng School of Chemical Engineering Hefei University of TechnologyHefei 230009China

In recent years, immense interest has been paid to the biomolecular architecture with the aim of protein assembly in two di- mensions on solid substrates, and the constructions of clay-protein ultrathin films （CPUFs） are particularly concerned. This paper gives an overview of the recent research concerning the protein molecules （lysozyme, papain, protamine, bovine serum albumin） immobilized on clay mineral （Na-saponite） platelets and assembled in monolayered or multilayered hybrid ultrafilms or nanofilms. Two techniques including alternate layer-by-layer （LbL） assembly and the Langmuir-Blodgett （LB） are de- scribed in detail. A variety of means, including UV-vis absorption, attenuated total reflectance Fourier transform infrared （ATR-FTIR） spectroscopy, XRD, AFM and surface chemistry techniques, have been described for characterization of the films in terms of quantification of protein and clay. The result reveals that electrostatic interaction is a prominent but not the only driving force in CPUF construction. In the case of LB technique, we managed to manipulate the elementary clay mineral platelets （1.3 nm in thickness） and assemble proteins into CPUFs with the aid of surfactants, and the formation of CPUFs was monitored via surface pressure vs. time （a--t） kinetics curves and surface pressure vs. area （a--A） isotherms. The factors that in- fluence protein adsorption on the clay layer, such as surfactants, the concentration of clay, equilibrium time, categories of pro- tein, and injection methods, were investigated. The parameters such as protein amount （nS）, packing density （O）, and average surface area per molecule （.（2） of deposited CPUFs were measured via method of surface chemistry and spectroscopy. By comparing the results of surface chemistry with those of adsorption experiments, we demonstrate that the surface chemistry method is a useful tool in investigating CPUFs. We also found that the water soluble protein molecules could form protein-clay hybrid mon

关键词： protein clay mineral ultrathin films design bio-catalytic performance

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Preparation and Characterization of Polymeric PVDF/PDDA ultrathin films

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稀有金属材料与工程 2006年第A3期35卷 550-551页

作者： Yun Ye Yadong Jiang Yong Wang Zhiming Wu Guangzhong Xie School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China

A new method for the production of nanoscaled polymeric multilayer films of ferroelectric PVDF is *** ultrathin multilayer films of poly diallyldimethylammonium chloride (PDDA) and polyvinylidene fluoride (PVDF) have been prepared on fuzed quartz substrate by the layer-by-layer self-assembly (LbL-SA) *** PDDA/PVDF multilayer films with the thickness of 30 nm to 150 nm have been characterized by quartz crystal microbalance (QCM) and infrared spectra (IR) The QCM reveals that the alternant ultrathin films of PVDF and PDDA are well order *** electric property of the ultrathin PDDA/PVDF multilayer films at room temperature is *** results show that property of ultrathin films differed from that of the thick films.

关键词： ultrathin films PVDF PDDA LbL-SA

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Role of the Confined Geometry on the Crystallization of Poly(ethylene terephthlate) ultrathin films

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Chinese Chemical Letters 2005年第7期16卷 987-990页

作者： YingZHANG YongLaiLU DeYahSHEN StateKeyLaboratoryofPolymerPhysics＆Chemistry JointLaboratoryofPolymerScience＆MaterialInstituteofChemistryChineseAcademyofSciencesBeijing100080

The reflection-absorption infrared (RAIR) was employed to study the crystallization kinetic of poly (ethylene terephthalate) (PET) ultrathin films. During isothermal crystallization the thinner PET film shows a slower kinetic compared with the thicker film. Moreover, the final crystallinity of films with various thickness was found decrease with thickness. The result of fitting our data to Avrami equation showed that the Avrami exponents decrease with film thickness.

关键词： RAIR ultrathin films crystallization.

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Modeling the defect distribution and degradation of CdTe ultrathin films

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Journal of Semiconductors 2014年第12期35卷 1-4页

作者： Nima E.Gorji Department of New Technologies University of Tabriz

The defect distribution across an ultrathin film CdTe layer of a CdS/CdTe solar cell is modelled by solving the balance equation in steady state. The degradation of the device parameters due to the induced defects during ion implantation is considered where the degradation rate is accelerated if the defect distribution is *** defect concentration is maximum at the surface of the CdTe layer where implantation is applied and it is minimum at the junction with the CdS layer. It shows that ultrathin devices degrade faster if the defect concentration is high at the junction rather than the back region（CdTe/Metal）. Since the front and back contacts of the device are close in ultrathin films and the electric field is strong to drive the defects into the junction, the p-doping process might be precisely controlled during ion implantation. The modeling results presented here are in agreement with the few available experimental reports in literature about the degradation and defect configuration of the ultrathin CdTe films.

关键词： defect distribution ultrathin films Cd Te degradation ion implantation

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A SIMPLE METHOD FOR THE INCORPORATION OF LOW MOLECULAR WEIGHT DYES IN ultrathin films

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Chinese Journal of Polymer Science 2003年第6期21卷 631-637页

作者： C. Geraldine Bazuin Carmen M. Tibirna Centre de Recherche en Sciences et Ingenierie des Macromolecules (CERSIM) Departement de Chimie Universite Laval Qudbec (QC). Canada GIK 7P4 Departement de chimie Universite de Montreal C.P. 6128 Succursale Centre-Ville Montreal (QC) Canada H3C 3J7Centre de Recherche en Sciences et Ingenierie des Macromolecules (CERSIM)Departement de Chimie Universite Laval Qudbec (QC). Canada GIK 7P4

A simple method for the fabrication of ultrathin films containing low molecular weight dye material is introduced(post-adsorption technique). The chromophore used is 4-nitro-4'-decyloxy azobenzene quaternary ammonium salt (azo-10Q).In classical layer-by-layer (LBL) procedures, where the substrate is dipped alternately into the chromophore solution and thecomplementary polyelectrolyte, the chromophore tends to desorb from the film during subsequent immersion in thepolyanion solution, and there is little or no indication of multilayer growth. The extent of desorption depends somewhat onthe selection of polyelectrolyte, the ionic strength and the pH of solution. An alternative approach is to first prepareconventional LBL films from a pair of oppositely charged polyelectrolytes, and then to soak this film into the chromophoresolution, where adsorption by penetration into the LBL film may take place. In preliminary results, a linear dependence ofUV absorbance on layer number of LBL film thus prepared was found, demonstrating the apparent effectiveness of the post-adsorption technique for the preparation of azo-10Q-containing ultrathin films.

关键词： ultrathin films Layer-by-layer Azo derivatives Polyelectrolytes Supramolecular complexes

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ultrathin Ti_(3)C_(2) nanowires derived from multi-layered bulks for high-performance hydrogen evolution reaction

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Chinese Chemical Letters 2022年第1期33卷 557-561页

作者： Weiwei Zhao Beibei Jin Longlu Wang Chengbo Ding Mengyue Jiang Tiantian Chen Shuaihang Bi Shujuan Liu Qiang Zhao Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China College of Electronic and Optical Engineering&College of Microelectronics Institute of Flexible Electronics(Future Technology)Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023 China

One-dimensional ultrathin nanowires(NWs)offer a great deal of promising properties for electrochemical energy storage and conversion due to their nanoscale confinement effect and high surface-to-volume *** is highly desirable to precisely design and synthesize ultrathin Ti_(3)C_(2)NWs in the aspect of size,crystalline structure and ***,we report a simple alkalization strategy to design the ultrathin Ti_(3)C_(2)NWs for hydrogen evolution reaction(HER)by modulating the surface-active *** design principle can well improve the amount of the defect sites and ion accessibility to increase the interactions between Ti_(3)C_(2)NWs and H^(*).The optimized Ti_(3)C_(2)NWs achieve an overpotential of 476 mV at the current density of 10 mA/cm^(2)and a Tafel slope of 129 mV/dec for HER catalysis,which are superior to that of Ti_(3)C_(2)nanosheets and m-Ti_(3)C_(2).It paves an avenue for the rational transformation of MXene bulks to one-dimensional NWs catalysts for HER.

关键词： MXene Ti_(3)C_(2)nanowires ultrathin films Chemical transformation Hydrogen evolution reaction

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Non-contact thickness measurement for ultra-thin metal foils with differential white light interferometry

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Chinese Optics Letters 2004年第12期2卷 701-703页

作者：杜艳丽严惠民吴勇姚晓强聂永军施柏煊 State Key Lab of Modern Optical Instrumentation National Engineering & Technology Research Center for Optical Instrument Zhejiang University Hangzhou 310027

A new differential white light interference technique for the thickness measurements of metal foil is presented. In this work, the differential white light system consists of two Michelson interferometers in tandem, and the measured reflective surfaces are the corresponding surfaces of metal foil. Therefore, the measuring result is only relative to the thickness but not the position of metal foil. The method is non-contact and non-destructive, it has the advantages of high accuracy, fast detection, and compact structure. Theoretical analysis and preliminary experimental verifications have shown that the technique can be used to measure the thickness of foil in the range of 1 to 80 μm with accuracy better than 0.08 μm.

关键词： Interferometers Interferometry Metal foil ultrathin films

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Nanopatterning of substrates by self-assembly in supramolecular block copolymer monolayer films

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Science China Chemistry 2013年第1期56卷 48-55页

作者： PEREPICHKA Iryna I. CHEN XiMin BAZUIN C. Géraldine Département de Chimie Centre de Recherche sur les Matériaux Auto-assemblés (CRMAA/CSACS)Université de MontréalC.P.6128 Succ.Centre-villeMontréal (QC) H3C 3J7Canada

Many technological applications require templates with nanoscale *** copolymer self-assembly is a method of choice for obtaining a large variety of such patterns,with greatest flexibility achieved when combined with a supramolecular *** of the ways to fabricate block copolymer templates is the Langmuir-Blodgett (LB) ***,we briefly summarize recent work with LB films of polystyrene-poly(4-vinyl pyridine) (PS-P4VP) mixed with 3-n-pentade cylphenol (PDP),illustrating the different types of patterns possible and the principles governing *** interesting pattern that can be easily achieved with this system is the so-called "nanostrand network",which,when used as a template for gold deposition,can produce double striped lines of ***,we show how this pattern can be modified by acetone swelling to give rise to gold monolayer ribbons with internal *** results also suggest new insights into the early stages of morphology formation at the air/water interface.

关键词： ultrathin films supramolecular block copolymers Langmuir-Blodgett monolayer patterns self-assembly

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高分子基分离膜的结构精细调控

高分子基分离膜的结构精细调控

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2015年第十四届全国应用化学年会

作者：靳健中科院苏州纳米技术与纳米仿生研究所

＜正＞传统高分子分离膜由于成膜材料种类少、制备方法单一及制备过程的不可控性,较难对分离膜结构（如膜表面结构、孔道结构、有效孔径等）进行精细调控,使膜性能难以进一步提升。我们围绕高分子分离膜"膜结构精细调控"这一关键科学问... 详细信息

＜正＞传统高分子分离膜由于成膜材料种类少、制备方法单一及制备过程的不可控性,较难对分离膜结构（如膜表面结构、孔道结构、有效孔径等）进行精细调控,使膜性能难以进一步提升。我们围绕高分子分离膜"膜结构精细调控"这一关键科学问题,从膜的多级物理结构和有效传输路径两个关键因素出发,构建了系列新型结构、高性能高分子及高分子基复合分离膜,显著提高了膜性能,在保障高精度的同时实现了高通量分离。在高分子溶液相转化过程中通过引入非

关键词： polymer separation membranes structure control high flux ultrathin films

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