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43.991 Aktuelle Fachpublikationen zum Thema temperature

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Relaxation dynamics of liposomes in an aqueous solution

02.07.2015 | S. K. Kundu; S. Choe; K. Sasaki; R. Kita; N. Shinyashiki; S. Yagihara, Physical Chemistry Chemical Physics, 2015

The gel–liquid crystal phase transition has been studied by the temperature and frequency dependent dielectric relaxation behavior of liposomes in an aqueous solution (40 g L−1 DPPC–water mixture). Four relaxation processes were observed in the frequency range from 40 Hz to 30 GHz which were ...

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Star-shaped VO2 (M) Nanoparticles Film with High Thermochromic Performance

01.07.2015 | Li Zhong; Ming Li; Hua Wang; Yuanyuan Luo; Jing Pan; Guanghai Li, CrystEngComm, 2015

Star-shaped VO2 (M) nanoparticles were synthesized by hydrothermal reaction using only ammonium metavanadate and formic acid combined with subsequently mild annealing treatment. An enhanced thermochromic performance was demonstrated upon changing temperature and the applied pulse voltage for the ...

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Continuous Flow of Nitroso Diels-Alder Reaction

01.07.2015 | erika nakashima; Hisashi Yamamoto, Chemical Communication, 2015

Our flow reaction systems have provided quantitative yields of nitroso Diels-Alder products with no byproducts in cases of cyclic dienes without temperature and pressure controls. Additionally, the reaction times were significantly shortened by using homogeneous catalyst (CuCl) or heterogeneous ...

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Study of temperature and ligand flexibility effects on coordination polymers formation from cyclobutanetetracarboxylic acid

01.07.2015 | Lizaira Bello; Marilyn E. Quintero; Asiloé J. Mora; Teresa González; Ana M. Escalona; Rafael Añez; Edward E. Ávila; ..., CrystEngComm, 2015

Three new coordination polymers based on the combination of rctt-1,2,3,4-cyclobutanetretracarboxylic acid (rctt-H4Cbtc) and trans-1,2-bis(4-pyridyl)ethane (4,4’-bpe) and Zn and Ni metal centers were synthesized under hydrothermal conditions and structurally characterized either by X-ray Single ...

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Facile synthesis of electrically conductive polycarbazole-zirconium(IV)phosphate cation exchange nanocomposite and its room temperature ammonia sensing performance

01.07.2015 | Umair Baig; Waseem A Wani; Lee Ting Hun, New Journal of Chemistry, 2015

In this work, we report the synthesis of electrically conductive polycarbazole-zirconium(IV)phosphate (PCz-ZrP) cation exchange nanocomposite as a new sensing material. Zirconium(IV)phosphate (ZrP) assisted in-situ chemical oxidative polymerization of carbazole was used for the synthesis of ...

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Experiments and analysis in the two-step growth of InGaAs on GaAs substrate

01.07.2015 | Jinping Li; Guoqing Miao; Zhiwei Zhang; Yugang Zeng, CrystEngComm, 2015

The two-step growth technique was introduced to solve the highly lattice-mismatched (5.6%) between In0.78Ga0.22As and GaAs substrate, and the mechanisms of dislocation density reduction by the low-temperature buffer (LT-buffer) were investigated experimentally. In the case of different thickness ...

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Reversible switching of amphiphilic self-assemblies between micelles and microemulsions by a thermal stimulus

01.07.2015 | Bin Dong; Xueqing Xing; Rui Wang; Bing Wang; Xiaoyan Zhou; Chang Wang; Li Yu; Zhonghua Wu; Yanan Gao, Chemical Communication, 2015

The ionic liquid (IL), tetrabutylphosphonium trifluoroacetate ([P4444][CF3COO]), showed a low critical solution temperature (LCST)-type phase transition in water. Using this temperature-sensitive IL and the Triton X-100/H2O system, the reversible transformation between micelles and microemulsions ...

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Electrosynthesis of enaminones directly from methyl ketones and amines with nitromethane as a carbon source

01.07.2015 | Kun Xu; Zhenlei Zhang; Peng Qian; Zhenggen Zha; Zhiyong Wang, Chemical Communication, 2015

An efficient and mechanistically different method for the electrosynthesis of enaminone directly from methyl ketones, amines and nitromethane was developed. This transition-metal-free method proceeded at room temperature to give a wide array of enaminones in one step, utilizing nitromethane as ...

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In situ production of silver nanoparticles on an aldehyde-equipped conjugated porous polymer and subsequent heterogeneous reduction of aromatic nitro groups at room temperature

01.07.2015 | Jie Liu; Jieshun Cui; Filipe Vilela; Jun He; Matthias Zeller; Allen D Hunter; Zhengtao Xu, Chemical Communication, 2015

In a metal-free procedure, chelating thiol groups and an electrophile react to assemble a robust, conjugated porous polymer with pendant aldehyde functionalities. These groups are able to reduce Ag(I) ions to generate, in situ, Ag(0) nanoparticles evenly dispersed on the polymer matrix. The ...

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Microwave-assisted solvothermal synthesis of a crystalline two-dimensional covalent organic framework with high CO2 capacity

01.07.2015 | hao wei; shuangzhi chai; Nantao Hu; Zhi Yang; Liangming Wei; Lin Wang, Chemical Communication, 2015

We report the synthesis of a two-dimensional enamine-linked covalent organic framework (COF) using a rapid microwave-assisted solvothermal method in significantly less time and high yield under relatively low temperature. This COF was found to have high crystallinity, high stability, high BET ...

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