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2.104 Aktuelle Fachpublikationen zum Thema temperature

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Nitridation of Silicon Powders Catalyzed by Cobalt Nanoparticles

21.03.2015 | Yajun Gu, Lilin Lu, Haijun Zhang, Yingnan Cao, Faliang Li, Shaowei Zhang, Journal of the American Ceramic Society, 2015

The effect of Co nanoparticles (NPs) on the nitridation of silicon (Si) was studied. Co NPs were deposited homogeneously on the surfaces of Si powders using an in situ reduction method using NaBH4 as a reducing reagent. Si powders impregnated with 0.5–2.0 wt% Co NPs were nitrided in ...

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The Strong Influence of Internal Stresses on the Nucleation of a Nanosized, Deeply Undercooled Melt at a Solid–Solid Phase Interface

19.03.2015 | Kasra Momeni; Valery I. Levitas; James A. Warren, Nano Letters, 2015

The effect of elastic energy on nucleation and disappearance of a nanometer size intermediate melt (IM) region at a solid–solid (S1S2) phase interface at temperatures 120 K below the melting temperature is studied using a phase-field approach. Results are obtained for broad range of the ratios of ...

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Synthesis and Growth Mechanism of TiC Whiskers by Carbothermal Reduction of Titania/Microcrystalline Cellulose

17.03.2015 | Huiwen Xiong, Zhiyou Li, Kechao Zhou, Journal of the American Ceramic Society, 2015

TiC whiskers were synthesized by a typical chloride‐assisted carbothermal reduction method using microcrystalline cellulose as a novel carbon source. Unlike previous research, Faceted TiC whiskers on the titanium oxide particles (Ti3O5) were epitaxially grown via vapor–solid mechanism without ...

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Synthesis of Cu3Sn Alloy Nanocrystals through Sequential Reduction Induced by Gradual Increase of the Reaction Temperature

16.03.2015 | Sanghun Cho, Dong‐Hun Shin, Zhenxing Yin, Chaedong Lee, Si Yun Park, Jeeyoung Yoo, Yuanzhe Piao, Youn Sang Kim, Chemistry - A European Journal, 2015

Abstract Cu3Sn alloy nanocrystals are synthesized by sequential reduction of Cu and Sn precursors through a gradual increase of the reaction temperature. By transmission electron microscopy (TEM), energy‐dispersive X‐ray spectroscopy (EDS), UV/Vis spectroscopy, and X‐ray diffraction (XRD) ...

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Electrospinning of gelatin fibers using solutions with low acetic acid concentration: Effect of solvent composition on both diameter of electrospun fibers and cytotoxicity

13.03.2015 | Marisa Erencia, Francisco Cano, Jose A. Tornero, Margarida M. Fernandes, Tzanko Tzanov, Jorge Macanás, Fernando Carrillo, Journal of Applied Polymer Science, 2015

ABSTRACT Gelatin fibers were prepared by electrospinning of gelatin/acetic acid/water ternary mixtures with the aim of studying the feasibility of fabricating gelatin nanofiber mats at room temperature using an alternative benign solvent by significantly reducing the acetic acid concentration. ...

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Quantum Yield Regeneration: Influence of Neutral Ligand Binding on Photophysical Properties in Colloidal Core/Shell Quantum Dots

13.03.2015 | Yi Shen; Rui Tan; Megan Y. Gee; Andrew B. Greytak, ACS Nano, 2015

This article describes an experiment designed to identify the role of specific molecular ligands in maintaining the high photoluminescence (PL) quantum yield (QY) observed in as-synthesized CdSe/CdZnS and CdSe/CdS quantum dots (QDs). Although it has been possible for many years to prepare ...

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Density, Viscosity, and Surface Tension of Liquid Phase Beckmann Rearrangement Mixtures

12.03.2015 | Klaas T. Zuidhof; Mart H. J. M. de Croon; Jaap C. Schouten; Johan T. Tinge, Journal of Chemical & Engineering Data, 2015

We have determined the density, dynamic viscosity, and surface tension of liquid phase Beckmann rearrangement mixtures, consisting of ε-caprolactam and fuming oleum. These important properties have been measured in wide ranges of both temperature and molar ratios of acid and ε-caprolactam, ...

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Facile Synthesis of ZnO–Reduced Graphene Oxide Nanocomposites for NO2 Gas Sensing Applications

06.03.2015 | Nagesh Kumar, Arvind Kumar Srivastava, Hari Shankar Patel, Bipin Kumar Gupta, Ghanshyam Das Varma, European Journal of Inorganic Chemistry, 2015

Abstract Graphene and its exotic forms have been widely recognized as exceptional materials for gas‐sensing applications because of their extraordinary electrical conductivity and large surface area to volume ratios. Herein, chemically reduced graphene oxide (rGO) and zinc oxide–reduced ...

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Se‐catalyzed Process of Sodium Bisulfite Disproportionation

05.03.2015 | Liyuan Chai, Bentao Yang, Hui Liu, Kaisong Xiang, Shu Yang, Cong Peng, Journal of Chemical Technology & Biotechnology, 2015

Abstract Background SO2 is an important gaseous pollutant that seriously affects environment and human health. The most common method for SO2 removal is absorption by NaOH solution and then forming HSO3−. Since generation of high‐valuable products and reduction of alkali consumption are ...

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Optimizing the Enzymatic Elimination of Clogging of a Microfiltration Membrane by Parellada Grape Cake

05.03.2015 | Jordi Pagán, Josep Conde, Ana Paola Echavarría, Albert Ibarz, Journal of Food Process Engineering, 2015

Abstract Clogging of the filtration membranes is one of the main problems in the process of obtaining grape must for white wine; therefore, clogging must be reduced to the maximum. The aim of this work was to find the optimal values of the temperature, time and enzyme solution concentration ...

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