Results 181 to 190 of about 106,557 (221)

Synthesis of Polydiethyoxylsiloxane Catalyzed by Dehydrated Tetramethylammonium Hydroxide

Advanced Materials Research, 2012
Tetramethylammonium hydroxide (TMAH) was dehydrated, and then used to catalyze the dimethyl cyclic siloxane ring cleavage and polymerize. The ethanol was used as both the solvent of TMAH and the capping agent to terminate the polymerization. Thus the high quality polydimethylsiloxane was synthesised. The influence of the amount of hexamethyl disiloxane
Xiao Deng Yang, Jian Cheng Wang, Qiu Tian Wang   +2 more
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A Raman Study of Etching Silicon in Aqueous Tetramethylammonium Hydroxide

Journal of The Electrochemical Society, 1998
The silicon etching process in tetramethylammonium hydroxide (TMAH) has been characterized using Raman scattering measurements. The measurements were carried out for 20 and 2% TMAH at different temperatures and for 20% TMAH in situ during the etching process.
P. T. Michaud, D. Babic
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Thermally assisted methylation of glycerol by tetramethylammonium hydroxide thermochemolysis

Journal of Analytical and Applied Pyrolysis, 2016
A novel method to rapidly methylate glycerol and generate products having greater value has been demonstrated using tetramethylammonium hydroxide (TMAH) thermochemolysis. Through analysis with GC–MS, it is shown that the reaction between TMAH and glycerol at elevated temperatures produces a series of mono, di and tri-methoxylated glycerols with ...
Derek C. Waggoner, Patrick G. Hatcher
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Experimental Characterization of the Si/Al/Tetramethylammonium Hydroxide System

Journal of The Electrochemical Society, 2001
Electrochemical measurements were used to determine the open-circuit potentials (OCP) of Si/tetramethylammonium hydroxide (TMAH) and Al/Si/TMAH systems. The OCP of Al/Si/TMAH and Si/TMAH were found to be in general agreement with the results obtained by other researchers using linear sweep voltammetry.
A. Tashtoush, L. M. Landsberger, A. Essalik, M. Kahrizi, M. Paranjape, J. F. Currie, A. Pandy   +6 more
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Removal of acid from diesel by tetramethylammonium hydroxide/ethanol

Petroleum Science and Technology, 2016
ABSTRACTNaphthenic acid was removed by tetramethylammonium hydroxide as deacidification agent from diesel, and ethanol was used as extractant. The effect of parameters in the deacidification process was investigated systematically. The process parameters included mass fraction of deacidification agent, volume ratio of deacidification agent to diesel ...
Hu Zhen, Yu Hailian
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Condensation of diacetylene with carbonyl compounds in the presence of tetramethylammonium hydroxide

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1973
1 Tetramethylammonium hydroxide causes the condensation of carbonyl compounds in aqueous medium. 2. The methyl ethers of di- and tetraacetylenic glycols were obtained from tetramethylhexadiynediol.
S. I. Shergina, A. S. Zanina, I. E. Sokolov, I. L. Kotlyarevskii   +3 more
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Raman study on molecular motion in tetramethylammonium hydroxide pentahydrate

The Journal of Chemical Physics, 1991
The Raman spectrum as well as conductivity and differential-thermal-analysis (DTA) thermogram of tetramethylammonium hydroxide pentahydrate was observed at various temperatures in order to investigate molecular motion in relation to conductivity and a phase transition.
Isao Kanesaka, Makoto Iwaki, Chikayo Uezawa, Nobuhiro Kuriyama, Tetsuo Sakai, Hiroshi Miyamura, Hiroshi Ishikawa   +6 more
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Reduced Anisotropy in Tetramethylammonium Hydroxide Based Silicon Etchants

ECS Transactions, 2017
At sub-10 nm technology nodes, silicon etching is critical to FEOL processes such as FinFET thinning, gap filler removal, pre-III-V deposition etch, and nanowire release etching. The key to developing solutions for these applications is being able to control the anisotropy of the Si etch, or the etch selectivity between Si (111), Si (100), and Si ...
Glenn Westwood, Chien-Pin Sherman Hsu
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NMR studies of molecular motion in tetramethylammonium hydroxide pentahydrate

Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1990
Polycrystalline (CH3)4NOH·5 H2O (I) and (CH3)4NOD·5D2O (II) have been studied by1H NMR lineshapes, second moments and spin-lattice relaxation times and by2H NMR lineshapes as a function of temperature. From low temperatures the first motion to occur is reorientation of the internally rigid (CH3)4N+ ion about a uniqueC3′ axis (Eta = 8.37 kJ/mol forI,Ea =
C. I. Ratcliffe, S. K. Garg, D. W. Davidson   +2 more
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Temperature dependence of proton chemical shifts of aqueous sodium fluoride, sodium hydroxide, and tetramethylammonium hydroxide: the internal tetramethylammonium ion standard

Journal of the Chemical Society, Dalton Transactions, 1973
Proton chemical shifts have been determined over a range of temperature for water, and for aqueous sodium fluoride and sodium or tetramethylammonium hydroxide solutions using Me4N+ as an internal standard. The water results agree closely with those of Hindman and confirm that the shift temperature dependence is not constant over the range 0–100 °C. The
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