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43.656 Aktuelle Fachpublikationen zum Thema temperature

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Thermal diffusivity measured with a single plasmonic nanoparticle

29.07.2015 | André Heber; Markus Selmke; Frank Cichos, Physical Chemistry Chemical Physics, 2015

A method to measure the thermal diffusivity around a single heated gold nanoparticle is presented. It is based on photothermal single particle microscopy and employs the phase delay of a temperature modulation due to the finite thermal diffusivity. The phase delay is detected optically averaging ...

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Enhanced thermal stability of Cu–silylphosphido complexes via NHC ligation

29.07.2015 | Bahareh Khalili Najafabadi; John F. Corrigan, Dalton Transactions, 2015

The facile preparation and structural characterization of [M6{P(SiMe3)2}6] (M = Ag, Cu) is reported. These complexes show limited stability towards solvent loss at ambient temperature; however, N-heterocyclic carbene (NHC) ligands were used to synthesize more thermally stable metal–silylphosphido ...

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Energy and Temperature Dependence of Rigid Unit Modes in AlPO4-5

29.07.2015 | Adam Berlie; Gordon J Kearley; Yun Liu; Dehong Yu; Christopher D Ling; Richard Mole; Ray L. Withers, Physical Chemistry Chemical Physics, 2015

For structures that can be treated as networks of rigid, corner-connected polyhedra, the dominant distortion modes can be describedby so-called rigid unit modes that are close to zero frequency. This type of behaviour is common in zeolitic/zeotypicmaterials such as the AlPO4 family of compounds ...

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Stability, Equilibrium Morphology and Hydration of ZrC (111) and (110) Surfaces with H2O: A Periodic DFT and Atomistic Thermodynamics Study

29.07.2015 | OSEI-AGYEMANG Eric; Jean-François Paul; Romain Lucas; Foucaud sylvie; Sylvain Cristol, Physical Chemistry Chemical Physics, 2015

ZrC is a non-oxide Ultra High Temperature Ceramic (UHTC) with excellent physical and mechanical properties used in nuclear plants and jet propulsion engines. However, mechanical properties can be lost because of the easy oxidation of its grain surfaces. One way of dealing with such problem is to ...

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Temperature dependent nanomorpholgy–performace relations in binary iridium complex blend films for organic light emitting diodes

29.07.2015 | Young-Tae Kim; Young-Hoon Kim; Jae-Bok Seol; Tae-Woo Lee; Chan Gyung Park, Physical Chemistry Chemical Physics, 2015

Understanding the mechanism responsible for temperature dependent performances of emitting layers is essential for developing advanced phosphorescent organic light emitting diodes. We described the morphological evolution occurring in the PVK:Ir(ppy)3 binary blend films with respect to thermal ...

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Low-Temperature Synthesis of Homogeneous Solid Solutions of Scheelite-Structured Ca1-xSrxWO4 and Sr1-xBaxWO4 Nanocrystals

29.07.2015 | Sean P Culver; Matthew J. Greaney; Antonio Tinoco; Richard L. Brutchey, Dalton Transactions, 2015

A series of compositionally complex scheelite-structured nanocrystals of the formula A1-xA´xWO4 (A = Ca, Sr, Ba) have been prepared under benign synthesis conditions using the vapor diffusion sol-gel method. Discrete nanocrystals with sub-20 nm mean diameters were obtained after kinetically ...

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Thermochromic and solvatochromic properties of Lindqvist polyoxometalates

29.07.2015 | Sven Herrmann; Johannes Margraf; Prof. Dr. Tim Clark; Carsten Streb, Chemical Communication, 2015

The thermochromic and solvatochromic properties of Lindqvist metal oxide clusters [VxM6-xO19]n- (x = 0-2, M = Mo, W) are reported. The cluster anions show pronounced changes of their electronic structure depending on their chemical environment (e.g. solvent polarity, temperature). These are ...

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Reversible Sol-Gel Transitions of Aqueous Dispersions of Silica Nanoparticles Grafted with Diblock Copolymer Brushes Composed of a Thermosensitive Inner Block and a Charged Outer Block

29.07.2015 | Bin Zhao; Roger A. E. Wright; Bin Hu; Daniel M Henn, Soft Matter, 2015

We report in this article that aqueous dispersions of thermosensitive diblock copolymer brush-grafted 17 nm silica nanoparticles (hairy NPs) can undergo in situ, reversible sol-gel transitions in response to temperature changes. The brushes consisted of a thermosensitive poly(methoxydi(ethylene ...

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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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TFA-promoted Direct C–H Sulfenylation at the C2 position of non-protected Indoles

28.07.2015 | Thomas Hostier; Vincent Ferey; Gino Ricci; Domingo Gomez-Pardo; Janine Cossy, Chemical Communication, 2015

A simple, efficient and practical metal-free C–H sulfenylation process at the C2 position of non-protected indoles has been developed. 2-Thioindoles were obtained in moderate to high yields using stable and readily available N-(thio)succinimides at room temperature in the presence of TFA.

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