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41.887 Aktuelle Fachpublikationen zum Thema temperature

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Binary phase diagrams for chromonic materials in water via fluorescence spectroscopy: cromolyn and water

19.11.2014 | Gerald Raymond Van Hecke; Kerry K Karukstis; Scott Rayermann, Physical Chemistry Chemical Physics, 2014

We report here the first example of a new and novel method of determining the binary temperature – composition phase diagram of a chromonic material in water using its intrinsic fluorescence. Disodium cromoglycate, or cromolyn, is an anti-allergy medicine representative of a class of compounds ...

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Single step derivatization with CF3 enone of thiophene at ambient temperature to determine propellant grade hydrazines: a study by GC and GC-MS

19.11.2014 | Selvakumar Subramanian; Somanathan Narayanasastri; Audisesha Reddy Kami Reddy, Analyst, 2014

A simple, highly selective and rapid gas chromatography method (packed column with flame ionization detection) has been developed to determine hydrazine and monomethylhydrazine individually and for selective determination of hydrazine in the UH 25 mixture in organic medium. This method is based ...

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Structures and optical properties of two phases of SrMgF4

19.11.2014 | Alexander P. Yelisseyev; Xingxing Jiang; Ludmila I. Isaenko; Lei Kang; Lei Bai; Zheshuai Lin; Alina A. Goloshumova; ..., Physical Chemistry Chemical Physics, 2014

SrMgF4 has an extremely large bandgap Eg of 12.50 eV as obtained from reflection dispersion. The symmetry of this crystal is monoclinic P21 at room temperature and transforms to the orthorhombic Cmc21 phase near 478 K as the temperature increases. The acentric character of the low-temperature ...

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A Phthalimidation Protocol That Follows Protein Defined Parameters

19.11.2014 | Rohith Singudas; Srinivasa Rao Adusumalli; Pralhad Namdev Joshi; Vishal Rai, Chemical Communication, 2014

This work outlines the first phthalimidation protocol suitable for protein labeling and performed in aqueous medium at room temperature and neutral pH with no obligation of catalyst or co-reagent. The methodology is suitable for a range of amines and its efficiency was determined with ...

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Role of Cu species in electrospun CuO-CeO2 nanofibers for total benzene oxidation

18.11.2014 | Yongjin Luo; Kuncan Wang; Yuxian Xu; Xiuyun Wang; Qingrong Qian; Qinghua Chen, New Journal of Chemistry, 2014

CuO-CeO2 nanofibers of relatively high surface (EL-CuCe) has been successfully prepared by electrospinning method and investigated for total benzene oxidation. The improved low-temperature performance of EL-CuCe compared to ST-CuCe (prepared by surfactant-templated method) is attributed to a ...

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Fine structuration of low-temperature co-fired ceramic (LTCC) microreactors

18.11.2014 | Bo Jiang; Julien Haber; Albert Renken; Paul Muralt; Lioubov Kiwi-Minsker; Thomas Maeder, Lab on a Chip, 2014

The development of microreactors that are operating under harsh conditions is always of great interests for many applications. Here we present a microfabrication process based on low-temperature co-fired ceramic (LTCC) technology for producing microreactors, which are able to perform chemical ...

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CO2 and temperature dual responsive “Smart” MXene phases

18.11.2014 | Jing Chen; Ke Chen; Dingyi Tong; Youju Huang; Jiawei Zhang; Jianming Xue; Qing Huang; Tao Chen, Chemical Communication, 2014

A robust strategy is explored to graft poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes on two-dimensional vanadium carbide (V2C) materials through self-initiated photografting and photopolymerization (SIPGP). CO2 and temperature dual-responsive properties of PDMAEMA allow this hybrid ...

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Reductive dechlorination of BCl3 for efficient ammonia borane regeneration

18.11.2014 | Yingbin Tan; Lijun Zhang; Xiaowei Chen; Xuebin Yu, Dalton Transactions, 2014

This paper reports a complete ammonia borane (AB) regeneration process in which Bu3SnH was utilized as a reductant for the reductive dechlorination of BCl3, and Et2PhN was selected as a ‘helper ligand’ to generate Et2PhN·BH3, which gives rise to a high yield of AB by a base-exchange reaction at ...

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Facile Immobilization of Enzyme on Three Dimensionally Ordered Macroporous Silica via a Biomimetic Coating

18.11.2014 | Yanjun Jiang; Yaping Wang; Hua Wang; Liya Zhou; Jing Gao; Yufei Zhang; Xu Zhang; Xiaomei Wang; Jian Li, New Journal of Chemistry, 2014

This study describes a general strategy using norepinephrine (NE) as a stable anchor for the immobilization of enzyme onto three-dimensionally ordered macroporous (3DOM) silica. Penicillin G acylase (PGA) was chosen as a model enzyme. The effect of pH and temperature on the activity of ...

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Coordination polymers of uranium (IV) terephthalates

18.11.2014 | Clément Falaise; ayalew assen; ionut mihalcea; Christophe Volkringer; adel mesbah; Nicolas Dacheux; Thierry Loiseau, Dalton Transactions, 2014

A series of tetravalent uranium terephthalates has been solvothermally synthesized in N,N-dimethylformamide solvent (DMF) at temperature 100-150°C with different water amounts. Composition diagrams have been determined for U4+ metallic cation in the presence of terephthalic acid, and their ...

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