نتایج جستجو برای: ionic salts
تعداد نتایج: 72320 فیلتر نتایج به سال:
We successfully carried out Prins-type polymerization for the first time to prepare 4-fluorinated tetrahydropyran-containing polymers in a highly stereoselective manner.
In recent years, biochar has emerged as a remarkable biosourced material for addressing global environmental, agricultural, biomedical, and energy challenges. However, the performances of rest in part on finely tuning its surface chemical properties, intended to obtain specific functionalities. this review, we tackle treatment with silane other coupling agents such diazonium salts, titanates, i...
This paper describes novel host-guest systems comprising viologen cations (guests) and the derivatives of bis-para-phenylene-34-crown-10 (hosts) with anionic groups COO(-) or SO(3)(-). The structure of the resulting charge-compensated host-guest complexes, their association constants and their electrochemical behaviour have been studied. In the solid state, the viologen cations thread the negat...
Prion diseases are associated with the conversion of cellular prion protein, PrPC, into a misfolded oligomeric form, PrPSc. Previous studies indicate that salts promote conformational conversion of the recombinant prion protein into a PrPSc-like form. To gain insight into the mechanism of this effect, here we have studied the influence of a number of salts (sodium sulfate, sodium fluoride, sodi...
This study reports the chemical composition of particles present along Greenland’s North Greenland Eemian Ice Drilling (NEEM) ice core, back to 110,000 years before present. Insoluble and soluble particles larger than 0.45μm were extracted from the ice core by ice sublimation, and their chemical composition was analyzed using scanning electron microscope and energy dispersive X-ray spectroscopy...
THE RESULTS OF THE STUDY OF THE INHIBITING EFFECT OF NEUTRAL SALTS UPON THE CLOTTING TENDENCY OF FIBRINOGEN BY THROMBIN MAY BE SUMMARISED AS FOLLOWS: Salts like NaCl and KCl inhibit only weakly. Salts of the same cation (K(*)) with monovalent anions of different ionic radius are the more active the larger the anion (Cl',Br',I'). Salts of the same cation with anions of different valency are the ...
The use of non-ionic LC phases as anisotropic matrices for E/Z-isomerization of azo-guest molecules is often restricted due to limited solubilities and demixing effects. In this study we therefore employed an ionic liquid crystal (ILC) matrix to follow the photo-induced E/Z-isomerization of ionic mesogenic azobenzene guanidinium guests. The latter were prepared from 4-hydroxy-4'-(octyloxy)azobe...
Acrylate functionalized ionic liquids based on tetraalkylammonium salts with terminal acrylates- and methylacrylates were synthesized. Melting points and ionic conductivity of twenty compounds in six groups were determined. Within one group the effect of three different counterions was investigated and discussed. The groups differ in cationic structure elements because of their functional group...
The interfacial tension of surfactant solutions is decreased with increasing surfactant concentration to obtain the critical micelle concentration (CMC). After that, the CMC values does not alter much. So this concentration is a critical point during surfactant flooding that is one of the chemical EOR techniques. The reduction of the CMC value is taken into consideration, since the surfactant f...
The neutral copper aluminum cluster complex Al12CuM3 [M = K, K3O, and K(2,2,2-crypt)] has been investigated at the PBE96 level of theory. It is found that Al12Cu could be considered a superatom mimic of a phosphorus atom. It shows large electron affinity and is able to receive three electrons from elements or compounds with low ionization energies like K, K3O, or K(2,2,2-crypt) to become a stab...
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