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46.353 Aktuelle Fachpublikationen zum Thema temperature

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Temperature Affects Human Sweet Taste via At Least Two Mechanisms

01.07.2015 | Barry G. Green; Danielle Nachtigal, Chemical Senses, 2015

The reported effects of temperature on sweet taste in humans have generally been small and inconsistent. Here, we describe 3 experiments that follow up a recent finding that cooling from 37 to 21 °C does not reduce the initial sweetness of sucrose but increases sweet taste adaptation. In ...

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Methylamine‐Gas Induced Defect‐Healing Behavior of CH3NH3PbI3 Thin Films for Perovskite Solar Cells

27.06.2015 | Zhongmin Zhou, Zaiwei Wang, Yuanyuan Zhou, Shuping Pang, Dong Wang, Hongxia Xu, Zhihong Liu, Nitin P. Padture, Guang ..., Angewandte Chemie International Edition, 2015

Abstract We report herein the discovery of methylamine (CH3NH2) induced defect‐healing (MIDH) of CH3NH3PbI3 perovskite thin films based on their ultrafast (seconds), reversible chemical reaction with CH3NH2 gas at room temperature. The key to this healing behavior is the formation and ...

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Direct Evidence for [4+2] Cycloaddition Mechanism of Alkynes to Tantallacyclopentadiene on Dinuclear Tantalum Complexes as a Model of Alkyne Cyclotrimerization

26.06.2015 | Keishi Yamamoto, Hayato Tsurugi, Kazushi Mashima, Chemistry - A European Journal, 2015

Abstract A dinuclear tantalum complex, [Ta2Cl6(μ‐C4Et4)] (2), bearing a tantallacyclopentadiene moiety, was synthesized by treating [(η2‐EtCCEt)TaCl3(DME)] (1) with AlCl3. Complex 2 and its Lewis base adducts, [Ta2Cl6(μ‐C4Et4)L] (L=THF (3 a), pyridine (3 b), THT (3 c)), served as more active ...

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Palladium‐Catalyzed Mono‐α‐arylation of Acetone at Room Temperature

26.06.2015 | Preston M. MacQueen, Alicia J. Chisholm, Breanna K. V. Hargreaves, Mark Stradiotto, Chemistry - A European Journal, 2015

Abstract The first examples of acetone mono‐α‐arylation at room temperature are described, enabled by use of a [Pd(cinnamyl)Cl]2/JosiPhos catalyst system. (Hetero)aryl chloride, bromide, and iodide electrophiles featuring or lacking ortho‐substitution, and comprising a range of functionalities ...

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Anion‐, Solvent‐, Temperature‐, and Mechano‐Responsive Photoluminescence in Gold(I) Diphosphine‐Based Dimers

26.06.2015 | Andrea Deák, Csaba Jobbágy, Gábor Marsi, Miklós Molnár, Zoltán Szakács, Péter Baranyai, Chemistry - A European Journal, 2015

Abstract A series of [Au2(nixantphos)2](X)2 (nixantphos=4,6‐bis(diphenylphosphino)‐phenoxazine; X=NO3, 1; CF3COO, 2; CF3SO3, 3; [Au(CN)2], 4; and BF4, 5) complexes that exhibit intriguing anion‐switchable and stimuli‐responsive luminescent photophysical properties have been synthesized and ...

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Systematic approach to study temperature and time effects on yield of pasta filata cheese

26.06.2015 | Balz Bähler, Thomas Ruf, Ravi Samudrala, Philipp Schenkel, Jörg Hinrichs, International Journal of Dairy Technology, 2015

A batch cooker‐stretcher for pasta filata cheese production was developed based on the kitchen machine ‘Thermomix’. With this batch model system, the effect of kneading time (180, 420 and 600s) and temperature (55, 60 and 70°C) on the chemical composition of the pasta filata cheese and the ...

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Stability and Decomposition of Ca‐Substituted Lanthanum Ferrite in Reducing Atmospheres

26.06.2015 | Patrick M. Price, Darryl P. Butt, Journal of the American Ceramic Society, 2015

Calcium‐substituted lanthanum ferrites (La1−xCaxFeO3−δ x=0, 0.1, 0.2, 0.3, 0.4) were synthesized in air and subsequently decomposed in reducing atmospheres. The partial pressure of oxygen () was controlled by varying the H2/H2O ratio by bubbling hydrogen/argon mixtures through water baths at ...

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A giant magnetocaloric effect with a tunable temperature transition close to room temperature in Na-deficient La0.8Na0.2-x[square]xMnO3 manganites

26.06.2015 | M. Wali; R. Skini; M. Khlifi; E. Dhahri; E. K. Hlil, Dalton Transactions, 2015

A giant magnetocaloric effect induced by sodium-deficiency in a La0.8Na0.2−x [[square]] xMnO3 (0.00 ≤ x ≤ 0.15) polycrystalline sample is reported in the present research work. The ability to tune the temperature transition close to room temperature is revealed to be possible by changing the ...

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The interception of a copper-based carbene radical with an [small alpha]-carbonyl diazomethane radical: C1/C1N2 copolymerization

26.06.2015 | Feifei Li; Longqiang Xiao; Yan Li; Cheng Chen; Lijian Liu, Chemical Communication, 2015

Poly(imidazole-Cu)-mediated C1/C1N2 copolymerization of ethyl diazoacetate involved copper-based carbene radical and α-carbonyl diazomethane radical intermediates, which could be captured by radical traps and detected by room-temperature EPR spectroscopy. The obtained C1/C1N2 copolymer could be ...

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Transition-Metal-Free Visible-Light Photoredox Catalysis at Room-Temperature for Decarboxylative Fluorination of Aliphatic Carboxylic Acids by Organic Dyes

26.06.2015 | Xinxin Wu; Chunna Meng; Xiaoqian Yuan; Xiaotong Jia; Xu Hong Qian; Jinxing Ye, Chemical Communication, 2015

We report herein an efficient, general and green method for decarboxylative fluorination of aliphatic carboxylic acids. By using a transition-metal-free, organocatalytic photoredox system, the reaction of various aliphatic carboxylic acids with Selectfluor reagent afforded the corresponding alkyl ...

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