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1.994 Aktuelle Fachpublikationen zum Thema temperature

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Preparation of Copper-Embedded Graphene Nanocomposites for Catalytic Hydroxylation of Benzene to Phenol

28.02.2015 | Bi, Huiping; He, Guangyu; Xu, Ran; Song, Zhiqi; Zhu, Junwu; Chen, Haiqun; Wang, Xin, Organic Chemistry, 2015

Abstract: The design and synthesis of graphene-based nanocomposites have drawn enormous attention in recent years owing to their unique structural properties. Here, we describe a simple hydrothermal procedure to fabricate Cu-graphene nanocomposites as a catalyst for direct hydroxylating ...

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Novel Photoluminescence Properties and Enhanced Photocatalytic Activities for V2O5-Loaded ZnO Nanorods

27.02.2015 | Haihong Yin; Ke Yu; Jingjing Hu; Changqing Song; Bangjun Guo; Zhiliang Wang; Ziqiang Zhu, Dalton Transactions, 2015

Three different kinds of V2O5/ZnO heteronanorods were synthesized through a CVD process and oxidized in air at temperatures of 350, 420 and 500 °C. These 1D heteronanorods are formed by ZnO nanorods (NRs) coated with V2O5 nanoparticles (NPs). With the rise of oxidization temperature, the coated ...

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Thermodynamics of nanoalloys

26.02.2015 | Florent Calvo, Physical Chemistry Chemical Physics, 2015

This article reviews recent advances in our understanding of how temperature affects the structure and phase of multimetallic nanoparticles. Focusing on bimetallic systems, we discuss the interplay of size, shape and chemical order on the stable configurations at thermal equilibrium. Besides some ...

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Vibrational properties and specific heat of core–shell Ag–Au icosahedral nanoparticles

25.02.2015 | Huziel E. Sauceda; Ignacio L. Garzón, Physical Chemistry Chemical Physics, 2015

The vibrational density of states (VDOS) of metal nanoparticles can be a fingerprint of their geometrical structure and determine their low-temperature thermal properties. Theoretical and experimental methods are available nowadays to calculate and measure it over a size range of 1–4 nm. In this ...

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Ni-Pt nanoparticles growing on metal organic frameworks (MIL-96) with enhanced catalytic activity for hydrogen generation from hydrazine at room temperature

25.02.2015 | wei luo; Jun Su; Ping Cai; Gongzhen Cheng; Xiaoqiong Du; Wen Lan, Dalton Transactions, 2015

Well-dispersed bimetallic Ni-Pt nanoparticles (NPs) with different compositions have been successfully growing on the MIL-96 by a simple liquid impregnation method using NaBH4 as the reducing agent. The powder X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray ...

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One-pot multicomponent synthesis of highly functionalized bio-active pyrano[2,3-c]pyrazole and benzylpyrazolyl coumarin derivatives using ZrO2 nanoparticles as reusable catalyst

25.02.2015 | Subhash Banerjee; Arijit Saha; Soumen Payra, Green Chemistry, 2015

A facile one-pot multicomponent protocol for the synthesis of bio-active pyrano[2,3-c]pyrazole and benzylpyrazolyl coumarin derivatives has been demonstrated using ZrO2 nanoparticles as catalyst at room temperature. The reactions are very fast and high yielding. The catalytic activity and ...

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Poly(ether‐imide) and related sepiolite nanocomposites: investigation of physical, thermal, and mechanical properties

20.02.2015 | Zahra Tabatabaei‐Yazdi, Shahram Mehdipour‐Ataei, Polymers for Advanced Technologies, 2015

Novel poly(ether‐imide) and sepiolite nanocomposites were synthesized based on a unique diamine monomer with the aim of improving physical and mechanical properties of final polyimide films. The diamine was polycondensed with 4,4′‐(hexafluoroisopropylidene) diphthalic anhydride to produce ...

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[Report] Programming colloidal phase transitions with DNA strand displacement

06.02.2015 | W. Benjamin Rogers; Vinothan N. Manoharan, Science , 2015

DNA-grafted nanoparticles have been called “programmable atom-equivalents”: Like atoms, they form three-dimensional crystals, but unlike atoms, the particles themselves carry information (the sequences of the grafted strands) that can be used to “program” the equilibrium crystal structures. We ...

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Clotting Activity of Polyphosphate‐Functionalized Silica Nanoparticles

04.02.2015 | Damien Kudela, Stephanie A. Smith, Anna May‐Masnou, Gary B. Braun, Alessia Pallaoro, Chi K. Nguyen, Tracy T. Chuong, ..., Angewandte Chemie International Edition, 2015

Abstract We present a silica nanoparticle (SNP) functionalized with polyphosphate (polyP) that accelerates the natural clotting process of the body. SNPs initiate the contact pathway of the blood‐clotting system; short‐chain polyP accelerates the common pathway by the rapid formation of ...

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Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

04.02.2015 | Alec Kirkeminde, Stan Spurlin, Laura Draxler‐Sixta, Jamie Cooper, Shenqiang Ren, Angewandte Chemie International Edition, 2015

Abstract Nanocrystalline metals have received widespread interest and found various applications owing to their magnetic and catalytic properties and in energy‐related fields. A flexible approach for the growth of nanoalloys with controlled properties and well‐defined structures on the atomic ...

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