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5.224 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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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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Temperature Affects Human Sweet Taste via At Least Two Mechanisms

01.07.2015 | Barry G. Green; Danielle Nachtigal, Chemical Senses, 2015

The reported effects of temperature on sweet taste in humans have generally been small and inconsistent. Here, we describe 3 experiments that follow up a recent finding that cooling from 37 to 21 °C does not reduce the initial sweetness of sucrose but increases sweet taste adaptation. In ...

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High activity and wide temperature window of Fe‐Cu‐SSZ‐13 in the selective catalytic reduction of NO with ammonia

27.06.2015 | Tao Zhang, Jianmei Li, Jian Liu, Daxi Wang, Zhen Zhao, Junhua Li, Kai Cheng, AIChE Journal, 2015

Abstract Fe‐Cu‐SSZ‐13 catalysts were prepared by aqueous solution ion‐exchange method based on the one‐pot synthesized Cu‐SSZ‐13. The catalysts were applied to the selective catalytic reduction of NO with NH3 and characterized by the means of XRD, UV‐Vis, EPR, XPS, NH3‐TPD, and so on. The ...

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Thermo‐ and pH‐sensitive triblock copolymers with tunable hydrophilic/hydrophobic properties

26.06.2015 | Christophe Pottier, Gaëlle Morandi, Virginie Dulong, Zied Souguir, Luc Picton, Didier Le Cerf, Journal of Polymer Science Part A: Polymer Chemistry, 2015

ABSTRACT Polymers consisting of poly(acrylic acid) (PAA) and statistical poly[(acrylic acid)‐co‐(tert‐butylacrylate)] (P(AA‐co‐tBA)), attached to both extremities of Jeffamine® (D series based on a poly(propylene oxide) (PPO) with one amine function at each end) using atom transfer radical ...

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Iron Atom Exchange between Hematite and Aqueous Fe(II)

26.06.2015 | Andrew J. Frierdich; Maria Helgeson; Chengshuai Liu; Chongmin Wang; Kevin M. Rosso; Michelle M. Scherer, Environmental Science & Technology, 2015

Aqueous Fe(II) has been shown to exchange with structural Fe(III) in goethite without any significant phase transformation. It remains unclear, however, whether aqueous Fe(II) undergoes similar exchange reactions with structural Fe(III) in hematite, a ubiquitous iron oxide mineral. Here, we use ...

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Smoluchowski Equations for Agglomeration in Conditions of Variable Temperature and Pressure and a New Scaling of Rate Constants: Application to Nozzle-Beam Expansion

26.06.2015 | J. Chaiken; J. Goodisman; O. Kornilov, Journal of Physical Chemistry A, 2015

The Smoluchowski equations provide a rigorous and efficient means for including multiple kinetic pathways when modeling coalescence growth systems. Originally written for a constant temperature and volume system, the equations must be modified if temperature and pressure vary during the ...

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Experimental determination of CO2 diffusion coefficient in aqueous solutions under pressure at room temperature via Raman spectroscopy: impact of salinity (NaCl)

25.06.2015 | Clément Belgodere, Jean Dubessy, Denis Vautrin, Marie‐Camille Caumon, Jérôme Sterpenich, Jacques Pironon, Pascal Rob ..., Journal of Raman Spectroscopy, 2015

The accurate determination of the diffusion coefficient of dissolved CO2 in aqueous solutions is a key parameter to predict the transport of the dissolved gas in the aqueous solution of porous aquifers and caprocks in the context of the mitigation of greenhouse gases emissions. A better ...

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Direct Observation of Wet Biological Samples by Graphene Liquid Cell Transmission Electron Microscopy

25.06.2015 | Jungwon Park; Hyesung Park; Peter Ercius; Adrian F. Pegoraro; Chen Xu; Jin Woong Kim; Sang Hoon Han; David A. Weitz, Nano Letters, 2015

Recent development of liquid phase transmission electron microscopy (TEM) enables the study of specimens in wet ambient conditions within a liquid cell; however, direct structural observation of biological samples in their native solution using TEM is challenging since low-mass biomaterials ...

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Anharmonic Infrared Spectroscopy through the Fourier Transform of Time Correlation Function Formalism in ONETEP

25.06.2015 | Valerio Vitale; Jacek Dziedzic; Simon M.-M. Dubois; Hans Fangohr; Chris-Kriton Skylaris, Journal of Chemical Theory and Computation, 2015

Density functional theory molecular dynamics (DFT-MD) provides an efficient framework for accurately computing several types of spectra. The major benefit of DFT-MD approaches lies in the ability to naturally take into account the effects of temperature and anharmonicity, without having to ...

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