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4.283 Aktuelle Fachpublikationen zum Thema temperature

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Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

28.07.2015 | Guofeng Huang; Youjin Zheng; Lizhi Peng; Zhanchang Li; Xiaopeng Jia; Hong-an Ma, CrystEngComm, 2015

Employing floatage as a driving force for diamond growth, crystallization of diamond crystals in Fe–Cr–C system co-doped with nitrogen and hydrogen elements is established at a static pressure of 6.5 GPa and a temperature range of 1335–1485 °C. Under the influence of nitrogen and hydrogen ...

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Multi‐Species Multi‐Channel (MSMC): An Ab Initio‐based Parallel Thermodynamic and Kinetic Code for Complex Chemical Systems

26.07.2015 | Minh V. Duong, Hieu T. Nguyen, Nghia Truong, Thong N.‐M. Le, Lam K. Huynh, International Journal of Chemical Kinetics, 2015

ABSTRACT Multi‐Species Multi‐Channel (MSMC) is an ab initio parallel program to calculate thermodynamic quantities (e.g., , , , and , time‐dependent species profiles, and rate coefficients as functions of temperature and pressure for complex chemical reaction systems, which consist of multiple ...

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Compressibility and structural stability of spinel-type MnIn2O4

26.07.2015 | Author(s): Maged F. Bekheet, Leonid Dubrovinsky, Aleksander Gurlo, Journal of Solid State Chemistry, 2015

Publication date: October 2015 Source:Journal of Solid State Chemistry, Volume 230 Author(s): Maged F. Bekheet, Leonid Dubrovinsky, Aleksander Gurlo Spinel-type MnIn2O4 materials are synthesized at 500°C from an In3+–Mn3+ co-precipitate; the synthesis is based on the in situ reduction ...

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A convection–diffusion porous media model for moisture transport in polymer composites: Model development and validation

24.07.2015 | Liangbiao Chen, Hsing‐Wei Chu, Xuejun Fan, Journal of Polymer Science Part B: Polymer Physics, 2015

ABSTRACT Moisture may cause many detrimental effects to polymers and their composites, thus inhibiting the applications of polymeric materials in hot and humid environments. In this article, a convection–diffusion porous media model is derived to better characterize rapid moisture transport in ...

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Growth and Device Characteristics of CZTSSe Thin-Film Solar Cells with 8.03% Efficiency

24.07.2015 | Dae-Ho Son; Dae-Hwan Kim; Si-Nae Park; Kee-Jeong Yang; Dahyun Nam; Hyeonsik Cheong; Jin-Kyu Kang, Chemistry of Materials, 2015

The improvement of the efficiency of Cu2ZnSn(S,Se)4 (CZTSSe)-based solar cells requires the formation of high-grain-sized pure CZTSSe throughout the film. We have successfully selenized precursor samples of Cu/SnS/ZnS/Mo/Soda lime glass in an almost sealed selenium furnace. Owing to the presence ...

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Solubility of Nonionic Hydrocarbon Surfactants with Different Hydrophobic Tails in Supercritical CO2

24.07.2015 | Qingzhao Shi; Lishuai Jing; Chongqiao Xiong; Chenyu Liu; Weihong Qiao, Journal of Chemical & Engineering Data, 2015

The experiment utilizes a high-pressure view chamber that mainly aims at identifying the effect of surfactant architecture on solubility in CO2. First, when solubility pressures of three series of nonionic hydrocarbon surfactants are measured, results reveal that surfactants with a methylated ...

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Shock Tube Measurements of the Rate Constant of the Reaction NCN + O2

23.07.2015 | Nancy Faßheber, Gernot Friedrichs, International Journal of Chemical Kinetics, 2015

ABSTRACT The rate constant of the comparably slow bimolecular NCN radical reaction NCN + O2 has been measured for the first time under combustion relevant conditions using the shock tube method. The thermal decomposition of cyanogen azide (NCN3) served as a clean high‐temperature source of NCN ...

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Direct Evidence for Solid-like Hydrogen in a Nanoporous Carbon Hydrogen Storage Material at Supercritical Temperatures

23.07.2015 | Valeska P. Ting; Anibal J. Ramirez-Cuesta; Nuno Bimbo; Jessica E. Sharpe; Antonio Noguera-Diaz; Volker Presser; Svem ..., ACS Nano, 2015

Here we report direct physical evidence that confinement of molecular hydrogen (H2) in an optimized nanoporous carbon results in accumulation of hydrogen with characteristics commensurate with solid H2 at temperatures up to 67 K above the liquid–vapor critical temperature of bulk H2. This extreme ...

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Kinetics and Reactor Modeling of the Steam Reforming of Methanol over Mn‐promoted Cu/Al Catalyst

21.07.2015 | Huancong Shi, Hussameldin Ibrahim, Mohanned M. Elamin, Raphael Idem, Paitoon Tontiwachwuthikul, Chemical Engineering & Technology, 2015

Abstract The kinetics of the steam reforming of methanol (SRM) was studied in a packed bed reactor over Mn‐promoted Cu/Al2O3 catalyst at atmospheric pressure, temperature range of 170 to 250 oC, and weight time (W/FA0) range of 0.38 to 2.40 g‐cat.h.mol‐1 CH3OH. A LHHW type mechanism that ...

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Some Factors Affecting the Molecular Weight Distribution (MWD) in Low Density Polyethylene Multizone Autoclave Polymerization Reactors

21.07.2015 | Enrique Saldívar‐Guerra, Almendra Ordaz‐Quintero, Ramiro Infante‐Martínez, Jorge Herrera‐Ordóñez, Luis Villarreal‐Cá ..., Macromolecular Reaction Engineering, 2015

Due to its complexity, free‐radical polymerization of ethylene at high pressure still remains to be fully understood. This paper investigates factors that contribute to shape the MWD, one of the main features of LDPE, such as the structure of primary chains and the reactor operation in one/two ...

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