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Online since: May 2011
Authors: Fang Ping Wang, Xin Zhen Du, Hu Po Mu, Dong Xia Zhang, Yun Jun Ma
Self-assembly of Amphiphilic Graft Copolymer with Poly(Acrylic Acid) Backbone and n-Octylphenyl Poly(Oxyethylene) Side Chains in Water FangPing Wanga, XinZhen Dub,HuPo Muc, DongXia Zhangd, YunJun Mae Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Gansu Polymer Materials,College of Chemistry and Chemical Engineering, Northwest Normal University, Anning Road 967,Lanzhou 730070, China awangfp@nwnu.edu.cn, bduxz@nwnu.edu.cn , cmuhupo@163.com dzhangdx@nwnu.edu.cn, elf0522@0931mail.com Keywords: Amphiphilic graft copolymer, Self-assembly, Fluorescent probe ,Morphology Abstract:The self-assembly of the amphiphilic graft copolymer AA-C8PhEO10Ac in water was investigated by fluorescence technique using 8-anilino-1-naphthalene sulfonate(ANS) as a probe and transmission electron microscopy (TEM), the effects of inorganic salt , copolymer concentration and pH on the micellar size and structures of AA-C8PhEO10Ac were discussed
The amphiphilic copolymer micelles exhibit great values not only in theoretical studies but also in applications such as material chemistry, biological medicine and environmental science[4-5].
In an aqueous solution, micelles with core-shell structure are formed through the segregation of insoluble blocks into the core, which is surrounded by hydrophilic shell composed of hydrophilic blocks[9,10] .
In recent years, much attention has been focused on the self assembly of amphiphilic block copolymer with highly asymmetric structures, whereas little descriptions were presented for the self-assembly of amphiphilic graft copolymers in aqueous solution in detail because of the strong hydrogen-bond interaction between water and the surfactant moleculars [11-13].
In this work, therefore, the self-assemble behavior of the copolymers was studied by fluorescence probe technique and TEM, the aim is to present information, which describe the effect of copolymer concentration , inorganic salts and pH on the onset of the morphology and structure of polymer micelles in aqueous solution.
Online since: January 2009
Authors: Xiao Wei Liu, Li Tian, Ying Zhang, Shu Yi Ji, Wei Wang
Fabrication process According to the theory of inlet/outlet orifice flow, the basic structure of the PMMA micropump is designed as double-layer structure:the sub-layer is patterned by the diffuser/nozzle structure, while the top-layer is no other pattern only to be used to package the structure, driven by PZT actuator installed on one side of the pump chamber, as shown in Fig.1.
Fig.1 the size and structure of PMMA micropump The diffuser/nozzle structure is the main fabrication part to be produced by ultra precision CNC milling(Three-axis vertical milling machine, Harbin Institute of Technology).
Packaging the diffuser/nozzle structure is the most important processing step for the micropump application.
So a kind of film-sealing technique is present in the PMMA substrate micro structure packaging.
The progress in the processing of chip and its appliance in the biology and chemistry also proved the potential and feasibility on the miniature.
Online since: September 2006
Authors: Kiyoshi Kanamura, Sang Wook Woo, Kaoru Dokko
A macroporous membrane of Li4Ti5O12 with inverse-opal structure was obtained.
The prepared material had a spinel-related crystallographic structure.
Li4Ti5O12 has a spinel related structure, and it can be prepared by sol-gel process [9].
Through this procedure, porous ceramic membrane with an inverse-opal structure was obtained.
It was considered that the grain growth increased the wall thickness of the porous structure.
Online since: January 2012
Authors: Di Wu, Ying Zhu, Hong Bin Chen, Jie Wu
Molecular structure: Fig.1 The mass spectrum Ⅱ Theoretical calculations In 3-21G * basis, we set optimization of Cycloheptanone ion (C7H12O+) hull structure with the density functional B3LYP method, and frequency calculation at the same level, The results showed no imaginary frequency, the configuration has been optimized for a minimum energy structure.
In the B3LYP/6-31 + G (d, p) level, all possible fragments generated by the GaussView3.07 the initial structure and internal coordinates, the structure of C6H10O+ fragments optimization and frequency calculation.
The results in Table 3: Table 3 C6H10O+ fragments of structure optimization, frequency and energy calculation Fragmentation  pathway The energy of the stable structures Frequency analysis Optimized stable structures 1P 15C-4C;3C-4C off   Energy: E=-309.5816 Frequency: no virtual frequency 1P2 1C-2C;3C-2C off Energy: E=-309.5816 Frequency: no virtual frequency   1P3 2C-3C;3C-4C off Energy: E=-309.5817 Frequency: no virtual frequency   Comparison can be seen from the table, the path formed by the debris 1P3 lowest energy structure, so C6H10O+ debris path to a stable structure as shown in the ring structure 1P3.
Its structure is as follows: Fig.3 C6H10O+ stable structure VI Conclusion The way of Produce C6H10O+ fragments is C7H12O+ C6H10O++ CH2 The 2C-3C, 3C-4C off, mainly through the fifth excited state occur the dissociation process.
The basic principles of quantum chemistry and ab initio calculation [M].Beijing: Science press, 1985
Online since: January 2007
Authors: Young Hwan Kim, Xiao Li Zhang, Young Soo Kang
Synthesis and Properties of TiO2/ZnO Core/Shell Nanomaterials Xiao-Li Zhang, Young Hwan Kim and Young Soo Kanga Department of Chemistry, Pukyong National University, 599-1 Daeyeon-3-dong, Nam-gu, Busan, 608-737, Korea a yskang@pknu.ac.kr Keywords: Core/shell nanostrucutre, ZnO coated TiO2 Abstract.
Core/shell structured TiO2/ZnO was synthesized in a basic aqueous solution through a simple hydrolyzing method.
The structure of core/shell structured particles was determined with powder X-ray diffraction (XRD, Philips X'Pert-MPD system, Cu Kα radiation, λ = 1.54056 Å) at a scanning rate of 0.02° per second for 2θ in the range from 5° to 80°.
The morphology of the core/shell structure of TiO2/ZnO nanoparticles was characterised by transmission electron spectroscopy.
Photocatalysis of the core/shell structured TiO2/ZnO had been measured with Rhodamine B, which is very sensitive to UV light.
Online since: July 2012
Authors: Chun Xiu Zhang, Jia Ling Pu, Ming Xia Zhang, Yi Fei Wang, Hao Wu
The chemical structures of compounds were characterized by 1HNMR spectra, FT-IR spectra and were confirmed.
The chemical structures were characterized by measuring on a Brucker DMX-300 300MHz NMR spectrometer and FTIR-8400.Thermal and optical properties of the synthesized materials were observed by using a Leica polarizing optical microscope equipped with a Linkam LC600 hot stage and a Netzsch differential scanning calorimeter DSC (Thermal Analysis DSC 2010).
The chemical structures of compounds were characterized by 1HNMR spectra, FT-IR spectra.
:Chinese Journal of Chemistry.Vol 23, Issue 6(2005), p.767
Online since: August 2011
Authors: Yu He, Wen Juan Guo, Mei Shan Pei, Guang You Zhang, Qi Wei Pan
Electrochemical Polymerization of N-(9-Fluorenylmethoxycarbony)-glycine and Characterization of Its Polymers Yu He1, Wenjuan Guo1, *, Guangyou Zhang1, Meishan Pei1 and Qiwei Pan1 1Department of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China gwjsci@gmail.com * correspondence author Keywords: Electrochemical Polymerization, Polyfluorene, N-(9-Fluorenylmethoxycarbony)-glycine Abstract Poly(N-(9-fluorenylmethoxycarbony)-glycine) (PFG) film was first synthesized on platinum wire by direct anodic oxidation of N-(9-fluorenylmethoxycarbony)-glycine (FG) in boron trifluoride diethyl etherate (BFEE).
The structure of PFG film was studied by FT-IR spectroscopy.
Introduction A large number of polymers having the conjugated backbone structure such as polypyrrole [1], polycarbazole [2], polythiophene [3] and polyfluorene derivatives [4] have been synthesized and used as the electroactive materials.
Fig. 1 Structure of FG monomer Results and Discussion In this paper, 50 mM FG was electrosynthesized both in pure BFEE and in ACN+ 0.1 M Tetrabutylammonium tetrafluoroborate (TBATFB).
Online since: May 2012
Authors: David N Lerner, Sheng Zhang
It is this portion of the molecule that gives the unique surface chemistry characteristics, including heat resistance.
The fluorosurfactants have a unique structure such that a perfluorinated molecule has been combined with a hydrocarbon molecule.
The ability of a surfactant to promote or inhibit co-contaminant biodegradation also appears structure specific.
Unfortunately, structure-activity relations have not been established for fluorinated surfactants.
Environmental Toxicology and Chemistry. 24(5), p. 1172–1181 (2005).
Online since: May 2021
Authors: Izan Roshawaty Mustapa, Mohammed Zorah, Nur Ain Syafiqah Sudin, Norlinda Daud
TiO2 also has a large surface area than their bulk counterparts, electrical and optical properties, pore structure, superhydrophilic, minute size, embedded effect and chemical inertness which yield many applications [18-26].
The increased of E’ at Tcc region reflects the increase of structure stiffness due to the cold crystallization during DMA measurements with a slow scanning rate at 2.0 K·min-1 [37].
Nevoralová, Graphite nanoplatelets-modified PLA/PCL: Effect of blend ratio and nanofiller localization on structure and properties, Journal of the mechanical behavior of biomedical materials 71 (2017) 271-278
Murray, DNA binding of an ethidium intercalator attached to a monolayer-protected gold cluster, Analytical chemistry 74(17) (2002) 4320-4327
Lo, Nanoparticle-based in vivo investigation on blood−brain barrier permeability following ischemia and reperfusion, Analytical chemistry 76(15) (2004) 4465-4471
Online since: June 2022
Authors: Ella Tkachenko, Yuliya Tolstenko, Elena Korzh, Leonid Yakovishin
Dashti, A review on chitin and chitosan polymers: structure, chemistry, solubility, derivatives, and applications, ChemBioEng Reviews. 2 (2015) 204-226
Chemistry.
Suchilina-Sokolenko, IR spectra and structure of composites based on polyimide 6 filled with arimide, Voprosy Khimii i Khimicheskoi Tekhnologii. 1 (2010) 67-70
Chemistry. 5 (2019) 230-237
Kupletskaia, Application of UV, IR, NMR and mass spectroscopy in organic chemistry, Izd-vo MSU, Moscow, 1979.