24625-03-4Relevant academic research and scientific papers
Nanoreactors stable up to 200 °c: A class of high temperature microemulsions composed solely of ionic liquids
Pei, Yuanchao,Ru, Jie,Yao, Kaisheng,Hao, Lihui,Li, Zhiyong,Wang, Huiyong,Zhu, Xingqi,Wang, Jianji
supporting information, p. 6260 - 6263 (2018/06/22)
It is a challenge to develop microemulsions which can serve as nanoreactors for the synthesis of nanoparticles and chemical reactions at high temperature. In this work, a class of novel high temperature microemulsions consisting solely of ionic liquids have been designed and prepared for the first time. It is found that nanoscale droplets formed in the ionic liquid microemulsions can be maintained up to 200 °C, and the size distribution of the droplets can be easily tuned by selection of the ionic liquids and varying compositions of the systems. By using such microemulsions as nanoreactors, porous metals such as Pt have been prepared at 180 °C without using any purposely added reductant.
New ammonium surfactant-stabilized rhodium(0) colloidal suspensions: Influence of novel counter-anions on physico-chemical and catalytic properties
Guyonnet Bile, Elodie,Sassine, Rita,Denicourt-Nowicki, Audrey,Launay, Franck,Roucoux, Alain
experimental part, p. 6524 - 6531 (2011/08/06)
Novel anionic species, such as hydrogen carbonate (HCO3 -), fluoride (F-), triflate (CF3SO 3-), tetrafluoroborate (BF4-) and chloride (Cl-) were investigated as new partners of water soluble N,N-dimethyl-N-cetyl-N-(2-hydroxyethyl) ammonium salts, used as a protective agent of rhodium colloids. The effect of the surfactant polar head on the micellar behavior, size and morphology of the nanospecies was studied by adapted physico-chemical experiments (surface tension measurements, dynamic light scattering, thermogravimetric and TEM analyses) and discussed in terms of strong or weak stabilization of the growing nanoparticles surface. Finally, the influence of the nanoenvironment generated by the surfactant with various counter-anions was evaluated via the hydrogenation of aromatics.
Ruthenium catalysts bearing chelating carboxylate ligands: application to metathesis reactions in water
Gawin, Rafa?,Czarnecka, Patrycja,Grela, Karol
scheme or table, p. 1051 - 1056 (2010/03/25)
The novel catalytic system, composed of a ruthenium alkylidene containing a surfactant fragment in the catalysts molecule, is reported. Ring closing metathesis and cross metathesis reactions proceed efficiently in neat water at room temperature, in air, without need of adding an external surfactant.
A structure-activity study of spermicidal and anti-HIV properties of hydroxylated cationic surfactants
Wong, Yue-Ling,Hubieki,Curfman, Christopher L,Doncel, Gustavo F,Dudding, Travis C,Savle, Prashant S,Gandour, Richard D
, p. 3599 - 3608 (2007/10/03)
The syntheses of 2-hydroxy-N-(2-hydroxyethyl)-N,N-dimethylhexadecan-1-aminium chloride [1(16)Cl] and iodide [1(16)I], 2-hydroxy-N,N,N-trimethylhexadecan-1-aminium chloride (6), N-(2-hydroxyethyl)-N,N-dimethylhexadecan-1-aminium chloride (8), N,N-bis(2-hydroxyethyl)-N-methylhexadecan-1-aminium chloride (11), and 2-hydroxy-N-(2-hydroxyethyl)-N,N-dimethyl-4-oxahexadecan-1-aminium chloride (14) are reported along with the critical micelle concentrations (cmcs), as measured by conductivity at 25°C, of 1(16)Cl, 1(16)I, 6, 8, 11, and N,N,N-trimethylhexadecan-1-aminium chloride (12). All compounds display spermicidal and virucidal activity. A plot of minimum effective concentration (MEC) in the Sander-Cramer spermicidal assay and cmc shows that 1(16)Cl and 6 have the best spermicidal activity and highest cmcs. Compounds 8, 11, and 1(16)Cl are the most active at 0.05 mg mL-1 against cell-free and cell-associated virus. In conclusion, 1(16)Cl shows the best combination of dual activity against sperm and HIV; it is a promising candidate for further preclinical studies as a topical, contraceptive microbicide.
