The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Qianjin Li - One of the best experts on this subject based on the ideXlab platform.
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one pot synthesis of amphiphilic janus gold nanoparticles with d penicillamine and Benzyl Mercaptan ligands by toluene water emulsion reaction
Applied Surface Science, 2019Co-Authors: Degui Li, Chengliang Hu, Qianjin LiAbstract:Abstract Amphiphilic Janus Au NPs were synthesized by emulsion reaction with presence of d -penicillamine (D-PA) and Benzyl Mercaptan (BM) molecules at water and toluene phases, respectively. TEM and XRD characterizations indicate that the reaction product is composed of Au nanocrystals in size of 2.9 nm. XPS, FTIR, Raman and 1H NMR analyses suggest that the capping ligands on the Au NPs are D-PA and BM, where the ratio of D-PA to BM is ca. 1.7. Contact angle measurement and NOESY analysis further reveal that the hydrophilic D-PA and lipophilic BM are separated into two distinct hemispheres on the individual Au NPs. The simple and efficient approach allows large scale preparation of amphiphilic Janus Au NPs at low cost for versatile applications, such as drug delivery, vapor sensors and heterogeneous catalysts.
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One-pot synthesis of amphiphilic Janus gold nanoparticles with d-penicillamine and Benzyl Mercaptan ligands by toluene/water emulsion reaction
Applied Surface Science, 2019Co-Authors: Degui Li, Chengliang Hu, Qianjin LiAbstract:Abstract Amphiphilic Janus Au NPs were synthesized by emulsion reaction with presence of d -penicillamine (D-PA) and Benzyl Mercaptan (BM) molecules at water and toluene phases, respectively. TEM and XRD characterizations indicate that the reaction product is composed of Au nanocrystals in size of 2.9 nm. XPS, FTIR, Raman and 1H NMR analyses suggest that the capping ligands on the Au NPs are D-PA and BM, where the ratio of D-PA to BM is ca. 1.7. Contact angle measurement and NOESY analysis further reveal that the hydrophilic D-PA and lipophilic BM are separated into two distinct hemispheres on the individual Au NPs. The simple and efficient approach allows large scale preparation of amphiphilic Janus Au NPs at low cost for versatile applications, such as drug delivery, vapor sensors and heterogeneous catalysts.
Manabu Node - One of the best experts on this subject based on the ideXlab platform.
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development of a novel Benzyl Mercaptan as a recyclable odorless substitute of hydrogen sulfide
Synlett, 2007Co-Authors: Manabu Matoba, Tetsuya Kajimoto, Manabu NodeAbstract:2,4,6-TrimethoxyBenzyl Mercaptan ( 4) was developed as an odorless substitute of hydrogen sulfide to afford β-mercapto -carbonyl compounds in a Michael addition and to convert alkyl -bromides into alkanethiols. DetrimethoxyBenzylation of the -Michael adducts prepared from 4 and α,β-unsaturated esters or -ketones was facilely carried out by treatment with a solvent mixture of trifluoroacetic acid and toluene to give β-mercapto carbonyl compounds. Successive alkaline hydrolysis of 2,4,6-trimethoxyBenzyl iso-thiouronium salt, which was obtained as a side product, regenerated 4 accompanying disulfide 8 in good yield. The disulfide 8 was also converted into 4 by reduction with LiAlH 4 . A similar -protocol was -applicable to the synthesis of alkanethiols using the S N 2 reaction of alkyl bromides. Our method could be complementary to the classical method of using malodorous Benzyl Mercaptan as a nucleophile and Birch reduction for deBenzylation.
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synthetic equivalents of benzenethiol and Benzyl Mercaptan having faint smell odor reducing effect of trialkylsilyl group
Tetrahedron Letters, 2002Co-Authors: Kiyoharu Nishide, Tetsuo Miyamoto, Kamal Kumar, Shinichi Ohsugi, Manabu NodeAbstract:Syntheses and odor tests of the trialkylsilylated Benzyl Mercaptans and benzenethiols have revealed that the trimethylsilyl substituent on the benzene ring has a remarkable effect in reducing the foul smell of the parent Benzyl Mercaptan and benzenethiol. Protodesilylation allowed these silylated thiols to function as odorless synthetic equivalents of Benzyl Mercaptan and benzenethiol. This discovery will greatly improve the physical environment of the researcher working with these malodorous compounds.
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Odorless substitutes for foul-smelling thiols: syntheses and applications
Tetrahedron Letters, 2001Co-Authors: Manabu Node, Kiyoharu Nishide, Kamal Kumar, Shinichi Ohsugi, Tetsuo MiyamotoAbstract:Several alkanethiols and p-alkylphenylmethanethiols were synthesized, and their odors were compared with those of ethanethiol and Benzyl Mercaptan by human and instrumental sensors. Among the various thiols analyzed, 1-dodecanethiol (1) and p-heptylphenylmethanethiol (3) were revealed to be odorless. 1-Dodecanethiol (1) has been used instead of ethanethiol for dealkylation of ethers, and p-heptylphenylmethanethiol (3) can replace Benzyl Mercaptan in the preparation of a 1,3-mercapto alcohol from an α,β-unsaturated ketone. These odorless thiols will greatly improve the physical environment of the researcher working with these foul-smelling compounds.
Degui Li - One of the best experts on this subject based on the ideXlab platform.
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one pot synthesis of amphiphilic janus gold nanoparticles with d penicillamine and Benzyl Mercaptan ligands by toluene water emulsion reaction
Applied Surface Science, 2019Co-Authors: Degui Li, Chengliang Hu, Qianjin LiAbstract:Abstract Amphiphilic Janus Au NPs were synthesized by emulsion reaction with presence of d -penicillamine (D-PA) and Benzyl Mercaptan (BM) molecules at water and toluene phases, respectively. TEM and XRD characterizations indicate that the reaction product is composed of Au nanocrystals in size of 2.9 nm. XPS, FTIR, Raman and 1H NMR analyses suggest that the capping ligands on the Au NPs are D-PA and BM, where the ratio of D-PA to BM is ca. 1.7. Contact angle measurement and NOESY analysis further reveal that the hydrophilic D-PA and lipophilic BM are separated into two distinct hemispheres on the individual Au NPs. The simple and efficient approach allows large scale preparation of amphiphilic Janus Au NPs at low cost for versatile applications, such as drug delivery, vapor sensors and heterogeneous catalysts.
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One-pot synthesis of amphiphilic Janus gold nanoparticles with d-penicillamine and Benzyl Mercaptan ligands by toluene/water emulsion reaction
Applied Surface Science, 2019Co-Authors: Degui Li, Chengliang Hu, Qianjin LiAbstract:Abstract Amphiphilic Janus Au NPs were synthesized by emulsion reaction with presence of d -penicillamine (D-PA) and Benzyl Mercaptan (BM) molecules at water and toluene phases, respectively. TEM and XRD characterizations indicate that the reaction product is composed of Au nanocrystals in size of 2.9 nm. XPS, FTIR, Raman and 1H NMR analyses suggest that the capping ligands on the Au NPs are D-PA and BM, where the ratio of D-PA to BM is ca. 1.7. Contact angle measurement and NOESY analysis further reveal that the hydrophilic D-PA and lipophilic BM are separated into two distinct hemispheres on the individual Au NPs. The simple and efficient approach allows large scale preparation of amphiphilic Janus Au NPs at low cost for versatile applications, such as drug delivery, vapor sensors and heterogeneous catalysts.
Petr Novak - One of the best experts on this subject based on the ideXlab platform.
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a low temperature Benzyl alcohol Benzyl Mercaptan synthesis of iron oxysulfide iron oxide composite materials for electrodes in li ion batteries
Journal of Materials Chemistry, 2015Co-Authors: Sebastien Sallard, Elias Castel, Claire Villevieille, Petr NovakAbstract:A low-temperature reaction of Benzyl alcohol/Benzyl Mercaptan with iron(III) acetylacetonate was used to synthetize micron and submicron-sized materials composed of one-pot mixture of iron oxysulfide and iron oxide. The final compound as well as reference materials greigite and magnetite were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy. The crystal structure, chemical composition, and morphology of the particles of the iron oxysulfide/iron oxide composite were compared to the ones of the references, iron sulfide and iron oxide. The materials showed clear differences both in reduction and oxidation when they were cycled between 0.1–3.0 V or 1.0–3.0 V vs. Li+/Li. In all cases, electrochemical properties of the iron oxysulfide/iron oxide mixture make out to the ones of two reference materials. The in situ XRD investigation of greigite nanoplatelets confirmed that a topotactic reaction occurs between 3.0 and 1.0 V vs. Li+/Li, followed by a conversion reaction at potentials negative to 1.0 V vs. Li+/Li during the first lithiation.
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A low-temperature Benzyl alcohol/Benzyl Mercaptan synthesis of iron oxysulfide/iron oxide composite materials for electrodes in Li-ion batteries
Journal of Materials Chemistry, 2015Co-Authors: Sebastien Sallard, Elias Castel, Claire Villevieille, Petr NovakAbstract:A low-temperature reaction of Benzyl alcohol/Benzyl Mercaptan with iron(III) acetylacetonate was used to synthetize micron and submicron-sized materials composed of one-pot mixture of iron oxysulfide and iron oxide. The final compound as well as reference materials greigite and magnetite were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy. The crystal structure, chemical composition, and morphology of the particles of the iron oxysulfide/iron oxide composite were compared to the ones of the references, iron sulfide and iron oxide. The materials showed clear differences both in reduction and oxidation when they were cycled between 0.1–3.0 V or 1.0–3.0 V vs. Li+/Li. In all cases, electrochemical properties of the iron oxysulfide/iron oxide mixture make out to the ones of two reference materials. The in situ XRD investigation of greigite nanoplatelets confirmed that a topotactic reaction occurs between 3.0 and 1.0 V vs. Li+/Li, followed by a conversion reaction at potentials negative to 1.0 V vs. Li+/Li during the first lithiation.
D. Kolb - One of the best experts on this subject based on the ideXlab platform.
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The electrochemical characterisation of Benzyl Mercaptan-modified Au(111): Structure and copper deposition
Analytical and Bioanalytical Chemistry, 2002Co-Authors: T. Baunach, D. KolbAbstract:The behaviour of Benzyl Mercaptan self-assembled monolayers on Au(111) in sulfuric acid solution was studied using cyclic voltammetry and in situ scanning tunnelling microscopy. Modification of the Au(111) surface in an ethanolic solution of Benzyl Mercaptan leads to a disordered monolayer. However, by partial reductive desorption a striped $$c\left( {15 \times \sqrt 3 } \right)$$ and a $$\left( {2 \times \sqrt 3 } \right)$$ structure were obtained. The disordered Benzyl Mercaptan film was also used for the study of copper deposition. At –0.02 V versus SCE, that is in the underpotential deposition region, monoatomic high islands appear on the surface. Bulk deposition of copper starts at –0.08 V versus SCE with the growth of dendrites underneath the thiol film. At higher overpotentials, the growth of three-dimensional copper clusters commences.
