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3.417 Aktuelle Fachpublikationen zum Thema temperature

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Indirect Chiral Separation of New Recreational Drugs by Gas Chromatography‐Mass Spectrometry Using Trifluoroacetyl‐L‐Prolyl Chloride as Chiral Derivatization Reagent

22.11.2014 | Jennifer A. Weiß, Stefan Mohr, Martin G. Schmid, Chirality, 2014

ABSTRACT New recreational drugs such as amphetamine‐, cathinone, and benzofury derivatives gained high popularity on the drug market in recent years. They can be purchased via the Internet from different providers and online portals. Most of these compounds are chiral, which makes the ...

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Surface grafting of carbon fibers with artificial silver‐nanoparticle‐decorated graphene oxide for high‐speed electrical actuation of shape‐memory polymers

22.11.2014 | Haibao Lu, Shipeng Zhu, Yunhua Yang, Wei Min Huang, Jinsong Leng, Shanyi Du, Journal of Applied Polymer Science, 2014

ABSTRACT Poor heat conduction in the interface between the carbon fiber and polymer matrix is a problem in the actuation of shape‐memory polymer (SMP) composites by Joule heating. In this study, we investigated the effectiveness of grafting silver‐nanoparticle‐decorated graphene oxide (GO) ...

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Chemical‐vapor‐sensitive materials based on a multiwalled carbon nanotube/hydroxyl propyl methylcellulose/cellulose composite

22.11.2014 | Kaihua Liu, Beihai He, Liying Qian, Junrong Li, Journal of Applied Polymer Science, 2014

ABSTRACT A type of chemical vapor‐sensing material made from multiwalled carbon nanotubes/hydroxyl propyl methyl cellulose/cellulose composite films were prepared in the room‐temperature ionic liquid 1‐butyl‐3‐methylimidazolium chloride ([BMIm]Cl). A typical negative vapor coefficient was ...

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Novel heterocyclic poly(pyridine‐imide)s with unsymmetric carbazole substituent and noncoplanar structure: High thermal, mechanical and optical transparency, electrochemical, and electrochromic properties

21.11.2014 | Ying‐Chi Huang, Kun‐Li Wang, Wei‐Yi Lee, Yi‐An Liao, Der‐Jang Liaw, Kueir‐Rarn Lee, Juin‐Yih Lai, Journal of Polymer Science Part A: Polymer Chemistry, 2014

ABSTRACT A diamine containing heterocyclic pyridine and unsymmetrical carbazole substituents, 4‐(9‐ethyl‐3‐carbazole)‐2,6‐bis(4‐aminophenyl)pyridine (CBAPP), was prepared for use in the synthesis of poly(pyridine‐imide)s PI‐1–8 by direct polycondensation with dianhydrides in ...

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Synthesis of carbazole‐substituted poly(dimethylsiloxane) and its improved refractive index

19.11.2014 | Norhuda Hidayah Nordin, Mohamad Riduwan Ramli, Nadras Othman, Zulkifli Ahmad, Journal of Applied Polymer Science, 2014

ABSTRACT A series of substituted 9‐vinylcarbazole polysiloxane was synthesized followed by room temperature vulcanization to afford a crosslink network via trimethoxysilane crosslinker. Structural confirmation was made using FTIR, one and two‐dimensional 1H‐ and 29Si‐NMR spectroscopy. ...

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Structural phase transitions in loparite‐(Ce): evidences from Raman light scattering

19.11.2014 | E. A. Popova, V. N. Yakovenchuk, S. G. Lushnikov, S. V. Krivovichev, Journal of Raman Spectroscopy, 2014

Raman spectroscopic studies of loparite‐(Ce), a mineral of the perovskite family, are presented. Polarized Raman spectra were obtained in the temperature range of 50–300 K. As analysis of the behavior of Raman modes showed, the temperature dependences of wavenumber, damping and intensity of the ...

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Above, below, and in‐between the two glass transitions of ultrathin free‐standing polystyrene films: Thermal expansion coefficient and physical aging

19.11.2014 | Justin E. Pye, Connie B. Roth, Journal of Polymer Science Part B: Polymer Physics, 2014

ABSTRACT In previous work we observed two simultaneous transitions in high molecular weight (MW) free‐standing polystyrene films that were interpreted as two thickness‐dependent reduced glass transition temperatures (Tgs). The weaker lower transition agreed well with the MW‐dependent Tg(h) ...

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Nucleation and growth of Ge nanoclusters on the Si(111)‐(7 × 7) surface studied by scanning tunneling microscopy

19.11.2014 | Yongping Zhang, Zhiqian Chen, Guo Qin Xu, Eng Soon Tok, Surface and Interface Analysis, 2014

Nucleation and growth of two‐dimensional Ge nanoclusters on the Si(111)‐(7 × 7) surface at elevated substrate temperatures have been studied using scanning tunneling microscopy. The uniformity of the Ge nanoclusters is improved with the increase of substrate temperature, and ordered Ge ...

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Adsorption of formic acid on Si(111)7 × 7 at room temperature: a valence band photoemission and Si2p photodesorption study

19.11.2014 | Marilena Carbone, Surface and Interface Analysis, 2014

Formic acid is the simplest of the carboxylic acids and a model adsorption system for several surfaces. In spite of the simple structure, formic acid reactivity and photoreactivity may be quite complex. In this paper, a study is presented on the deuterated formic acid adsorption on Si(111)7 × 7 ...

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Enhanced thermal conductivity of epoxy–matrix composites with hybrid fillers

19.11.2014 | Karolina Gaska, Andrzej Rybak, Czeslaw Kapusta, Robert Sekula, Artur Siwek, Polymers for Advanced Technologies, 2014

The results of thermal conductivity study of epoxy–matrix composites filled with different type of powders are reported. Boron nitride and aluminum nitride micro‐powders with different size distribution and surface modification were used. A representative set of samples has been prepared with ...

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