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Interfacial behaviors of PMMA-PEO block copolymers at the air/water interface

science china {2. 2005年第6期48卷 567-573页

作者： CHENG Caixia1, JIAO Tifeng2. TANG Rupei1, LIU Minghua2.& XI Fu1 1. State key laboratory of Polymer Physics and {2., Joint laboratory of Polymer science and Materials, institute of chemistry, chinese academy of sciences, beijing 100080, china 2. cas key laboratory of colloid and interface science, institute of chemistry, chinese academy of sciences, beijing 100080, china 1. State key laboratory of Polymer Physics and {2. Joint Laboratory of Polymer Science and Materials Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China 2. cas key laboratory of colloid and interface science Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China

Diblock copolymer of PMMA2.1-b-PEO114 and triblock copolymer of PMMA12.-b- PEO2.7-b-PMMA12. were synthesized and their interfacial properties at the air-water interface were investigated, where both blocks of polyethylene oxide (PEO) and poly(methyl methacrylate) (PMMA) are surface active but the former is soluble in water while the latter is not. Both the block copolymers could form monolayers with two obvious transition regions. The first transition point is around 10 mN/m, which could be assigned to the pancake-brush change of the PEO chains. The other is around 18 mN/m, which could be ascribed to the condensed packing of PMMA. The surface morphological changes during the compression of the Langmuir monolayers are inves-tigated by using the AFM and SEM methods for the films deposited at different surface pressure or molecular areas. At a lower surface pressure, a typical morphology of PEO-con- taining lipopolymers is observed. Upon compression, sphere-dominant morphologies were observed. While the diblock copolymer is easy to folding, the triblock copolymer is in favor of formation of circular domains through vesiculation.

关键词： PMMA-PEO, block copolymers, monolayer, Langmuir-Blodgett films, AFM.

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Adsorption behavior of hexadecyltrimethylammonium bromide (CTAB) to mica substrates as observed by atomic force microscopy

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science china {2. 2005年第2期48卷 101-106页

作者： ZHAO Feng1,2. DU Yukou1, YANG Ping1, LI Xingchang2.& TANG Ji’an2.1. chemistry and Chemical Engineering Department, Suzhou University, Suzhou 2.5006, china 2. {2. laboratory of colloid and interface science, institute of chemistry, chinese academy of sciences, beijing 100080, china Correspondence should be addressed to Tang Ji’an (email: jatang@***) 1. chemistry and Chemical Engineering Department Suzhou University 215006 Suzhou China 2. key laboratory of {2. and interface science Institute of Chemistry Chinese Academy of Sciences 100080 Beijing China

Atomic force microscopy is employed to study the adsorption behavior of CTAB to mica surfaces. Results show that conformational transitions from globular micelles→cylindrical micelles→flat films are observed in the process of the adsorption of CTAB to mica at twice the bulk critical concentration. However, in 0.5 cmc CTAB solution, the adsorbed CTAB molecules to mica form the layered film structures, and apparent conformational transitions do not appear. Meanwhile, the phenomena of the adsorption of CTAB to mica and the dissociation of mica sur- faces are periodically observed.

关键词： atomic force microscopy (AFM), micelle, behavior of adsorption, the dissociation of mica surfaces.

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Separation of hydrophobic gold nanoparticles less than 10 nm by electrophoresis

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science Bulletin 2005年第15期 57-60页

作者： YANG Yun1,2. MU Jin2.& JIANG Long1,2.1. key laboratory of {2. and interface science, institute of Chemis-try, chinese academy of sciences, beijing 100080, china 2. School of chemistry and Pharmaceutics, china East University of science and Technology, Shanghai 2.02.7, china

An electrophoresis device was used to separate hydrophobic gold nanoparticles with particle size less than 10 nm dispersed in organic solvent. Image of transmission electron microscope (TEM) and UV-Vis spectra showed that the particles in the vicinity of cathode have a smaller mean diameter than those near the anode. This result indicates that the nanogolds in chloroform bring a positive charge in oppo-sition to what is predicted by Coehn rule, and provides an electrophrosis method for separating hydrophobic nanogold particles of different sizes.

关键词： electrophoresis gold nanoparticles separation.

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Supramolecular chirality in organized molecular film and organogel:From achiral molecules to chiral Assemblies

Supramolecular chirality in organized molecular film and org...

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The 9th china-Japan Joint Symposium on Conduction and Photoconduction in Organic Solids and Related Phenomena

作者： Minghua LIU cas key {2. of colloid,interface and Thermodynamics.institute of chemistry,cas,beijing,P.R.china,100080

Chirality is one of the important properties that materials could show besides their photo,electro and magnetic *** fabricating the chiral materials,not only the chirality of the component molecules but also the chirality through the non-covalent bond player important *** a supramolecular level,chirality is strongly related to the molecular *** of the greatest merits of the supramolecular system is that achiral molecules could be induced into supramolecular chirality,which opens great possibility to the design and fabrication of functional chiral ***,our group has focused on the supramolecular chirality based on a series of achiral molecules through the assembly at the air/water interface and fabricated optically active solid films from many achiral *** addition, based on the principle of the molecular interaction,we have further expanded to the fabrication of soft materials such as organogel.

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PHOTOCHEMICAL REACTION, ACIDICHROMISM AND SUPRAMOLECULAR NANOARCHITECTURES IN THE LANGMUIR-BLODGETT FILMS OF AN AMPHIPHILIC STYRYLQUINOXALINE DERIVATIVE

PHOTOCHEMICAL REACTION, ACIDICHROMISM AND SUPRAMOLECULAR NAN...

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Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： MEIFANG YIN HAOFEI GONG BAOWEN ZHANG MINGHUA LIUcas key {2. of colloid and interface science institute of chemistry cas beijing 100080 chinaTechnical institute of Physics and chemistry cas beijing 100101 china

＜正＞ An amphiphilic styrylquinoxaline derivative, 3-（4-（hexadecyloxy）styryl）quinoxalin-2.1H）-one （SQC16）, was newly synthesized to investigate their photochemical and gas responsive properties in the organized molecular films. It was observed that SQC16 can spread as a monolayer on the subphases with various pH values and can be subsequently transferred onto solid substrates. While SQC16 showed predominantly reversible trans-cis photoisomerization in the methanol solution, it showed both photoisomerization and photodimerization in the LB film. The photodimerization was only observed in the LB film due to the face-to-face arrangement of the functional headgroup in the LB film and the process was irreversible. In addition, the LB film showed an acidichromism, i.e. when the film was exposed to HCl gas it turned its color from yellow to red and the color could be recovered after exposing to NH3 gas. The process was reversible and could be repeated many times. Interesting surface morphology of the SQC16 LB film was revealed. It was observed that SQC16 can form nanowire architecture in the transferred one-layer LB film. Such morphology can be changed upon photoirradiation or in gas reactions. Through the AFM measurements, it was suggested that the photodimerization predominantly occurred from the nanowire structures, while during the acidichromism the reaction occurred preferentially in the flat region. XRD studies revealed that while layer distance showed a slight change for the LB film during the acidichromism and photoreaction, the layer structure of SQC16 LB film was kept.

关键词： photodimerazation acidchromism Langmuir-Blodgett

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A facile and efficient dry transfer technique for two-dimensional Van der Waals heterostructure

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chinese Physics B 2017年第8期26卷 417-422页

作者：谢立杜罗军卢晓波杨蓉时东霞张广宇 beijing National laboratory for Condensed Matter Physics and {2. of Physics Chinese Academy of Sciences(CAS)Beijing 100190China School of Physical science University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100190China beijing key {2. for Nanomaterials and Nanodevices Beijing 100190China

Two-dimensional （2.） Van der Waals heterostructures have aroused extensive concerns in recent years. Their fabrica- tion calls for facile and efficient transfer techniques for achieving well-defined structures. In this work, we report a simple and effective dry transfer method to fabricate 2. heterostructures with a clean interface. Using Propylene Carbonate （PC） films as stamps, we are able to pick up various 2. materials flakes from the substrates and unload them to the receiving substrates at an elevated temperature. Various multilayer heterostructures with ultra-clean interfaces were fabricated by this technique. Furthermore, the 2. materials can be pre-pattemed before transfer so as to fabricate desired device structures, demonstrating a facile way to promote the development of 2. heterostructures.

关键词： two-dimensional materials Van der Waals heterostructure Propylene Carbonate transfer

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Self-assembly and Application of Peptide Based Nanostructures

Self-assembly and Application of Peptide Based Nanostructure...

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中国化学会第十三届胶体与界面化学会议

作者： Xuehai Yan,Pengli Zhu and Junbai Li beijing National laboratory for Molecular {2.(BNLMS),cas key Lab of colloid and interface {2.,institute of chemistry,beijing,china

＜正＞Self-assembly of organic components combined with functional inorganic components is a particularly powerful means to fabricate new nanostructured *** building blocks,such as peptides,are the suitable candidates as the self-assembled organic components. Here we will introduce a method to assemble hybrid 3D colloidal spheres composed of a cationic dipeptide building block and functional lipophilic *** is deduced that the

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Molecular Assembly of Motor Proteins in Microcapsules

Molecular Assembly of Motor Proteins in Microcapsules

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中国化学会第十二届胶体与界面化学会议

作者： Junbai Li beijing National laboratory for Molecular {2.(BNLMS),International Joint Lab, key Lab of colloid and interface science,institute of chemistry,chinese academy of {2., and National Center for Nanoscicence and Technology,beijing,100190

ATP synthase is a key enzyme for energy metabolism and the smallest biomolecular motor in *** functionality of ATP synthase has attracted great interests in the last *** we introduced our recent work on the molecular assembly of molecular motors *** reconstituted CFF-ATPase in the outer shell of assembled several microcapsules containing a lipid *** activity and rotation of

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Hierarchically Fabricated Amphiphilic Copolymer/Gold Nanostructures via Hydrosilylation

Hierarchically Fabricated Amphiphilic Copolymer/Gold Nanostr...

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中国化学会第十二届胶体与界面化学会议

作者： Dongxiang Li,~1 Chunfang Li,~1 Anhe Wang,~2.Wanguo Hou,~(1,*) Junbai Li~(2.*) 1 College of chemistry and Molecular Engineering,Qingdao University of science and Technology,Qingdao 2.6042.2.{2. Lab of colloid and interface science,institute of chemistry,chinese academy of sciences,beijing {12.

＜正＞Gold nanoparticles within a range of 1-100 nm shall fit to an increasing field of nanomedicine,the polymer modified nanoparticles have displayed an increasing interest for biological *** gold nanoparticles also ...

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Scalar Seismic-Wave Equation Modeling by a Multisymplectic Discrete Singular Convolution Differentiator Method

Scalar Seismic-Wave Equation Modeling by a Multisymplectic D...

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： Xiaofan Li,Yiqiong Li,Meigen Zhang,and Tong Zhu key laboratory of the Earth’s Deep Interior,{2. institute of Geology and Geophysics chinese academy of sciences beijing 10002.,People’s Republic of china

High-precision modeling of seismic-wave propagation in heterogeneous media is very important to seismological ***,such modeling is one of the difficult problems in the seismological research *** developing methods of seismic inversion and high-resolution seismic-wave imaging,the modeling problem must be solved as perfectly as ***,for long-term computations of seismic waves(e.g.,Earth’s free-oscillations modeling and seismic noise-propagation modeling),the capability of seismic modeling methods for long-time simulations is in great *** this paper,an alternative method for accurately and efficiently modeling seismic wave fields is presented;it is based on a multisymplectic discrete singular convolution differentiator scheme(MDSCD).This approach uses optimization and truncation to form a localized operator,which preserves the fine structure of the wave field in complex media and avoids noncausal interaction when parameter discontinuities are present in the *** approach presented has a structure-preserving property, which is suitable for treating questions of high-precision or long-time numerical *** numerical results indicate that this method can suppress numerical dispersion and allow for research into long-time numerical simulations of wave fields. These numerical results also show that the MDSCD method can effectively capture the inner interface without any special treatment at the discontinuity.

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