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1.
R. N. Singh S. Sujatha G. K. Mishra 《Journal of Radioanalytical and Nuclear Chemistry》1990,146(6):427-436
The distribution ratios for the extraction of Zr(IV) by TBP and its binary mixtures with DMSO or Py in n-dodecane in the presence of HNO3, and HClO4 have been determined. Based on stoichiometric and slope analysis methods a possible mechanism for the extraction has been proposed. 相似文献
2.
Solvent-adaptable silver nanoparticles 总被引:4,自引:0,他引:4
Prasad BL Arumugam SK Bala T Sastry M 《Langmuir : the ACS journal of surfaces and colloids》2005,21(3):822-826
A simple and efficient way of obtaining silver nanoparticles that are dispersible both in organic and in aqueous solvents using a single capping agent is described. The silver nanoparticles are initially prepared in water in the presence of aerosol OT [sodium bis(2-ethylhexyl)-sulfosuccinate, AOT]. Thereafter, transfer of the AOT-capped silver nanoparticles to an organic phase is induced by the addition of a small amount of orthophosphoric acid during shaking of the biphasic mixture. The AOT-stabilized silver nanoparticles could be separated out from the organic phase in the form of a powder. The hydrophobic nanoparticles thus prepared are stable and are readily resuspended in a variety of other polar (including water) and nonpolar solvents without further surface treatment. The amphiphatic nature of the silver surface is brought about by a small orientational change in the AOT monolayer on the silver surface in response to the polarity of the solvent. 相似文献
3.
Kodam Sujatha 《合成通讯》2018,48(3):302-308
An expeditious one pot method has been developed for the synthesis of 2,4-disubstituted thiazoles under solvent free conditions via a multicomponent approach. Substituted thiazoles were synthesized with high yields by the reaction of cyclic ketones, thiosemicarbazide, and phenacyl bromides or 3-(2-bromoacetyl)-2H-chromen-2-ones in a shorter reaction time with high purity via simple purification technique. 相似文献
4.
A modified combustion process, namely a mixed fuel process making use of a mixture of two fuels, such as citric acid and glycine
has been developed to prepare nanocrystalline ceria powders. The effect of the mixed fuel and the different fuel to oxidant
ratios on the decomposition characteristics of the gels were investigated by simultaneous thermal analysis experiments. It
was established from various characterization techniques that the ceria powder prepared through the mixed fuel process has
got the optimum powder characteristics, namely, a surface area of 33.33 m2/g and a crystallite size of 14 nm compared to the powders produced through the combustion process using a single fuel like
glycine or citric acid. Such powders when sintered at 1250°C resulted in pellets with densities in the range of 94–96% of
theoretical density. In this paper, we have carried out systematic studies on the sintering of ceria powders prepared by different
approaches. The sintered ceramic from mixed fuel batch, exhibited and retained relative density more than 95% up to 1250°C
and this data clearly underscores the ability of this process in developing ceria ceramics with increased stability against
reduction. 相似文献
5.
We present a graphical analysis of the mechanisms underlying the occurrences of bubbling sequences and bistability regions
in the bifurcation scenario of a special class of one dimensional two parameter maps. The main result of the analysis is that
whether it is bubbling or bistability is decided by the sign of the third derivative at the inflection point of the map function. 相似文献
6.
P Sujatha Devi 《Journal of Non》2004,336(2):128-134
Vanadium doped silica gels were prepared from tetraethyl orthosilicate and three different inorganic vanadium precursors with formal oxidation states of V3+, V4+ and V5+ respectively. Optical and EPR studies were carried out on the dried gels to understand the changes in the oxidation state and coordination of vanadium in the doped silica gel matrix. The observed optical and EPR results provide very strong evidence to establish that irrespective of the starting material, vanadium is stabilized as vanadyl ion in the gel monoliths. EPR studies on the powdered samples corroborate the optical data on the gel samples and confirmed that the stabilized vanadyl ion is situated in a distorted octahedral geometry in these silica gels. 相似文献
7.
Khadhar Navaz Umar Basha Shanthi Gnanamani Prakash Shanmugam Sujatha Venugopal Sangeetha Murthy Balagurunathan Ramasamy 《Journal of heterocyclic chemistry》2021,58(10):2000-2008
A simple and convenient method for the one-pot synthesis of 3-(1H-indole-3-carbonyl)-2H-chromen-2-one derivatives from the reaction of 3-cyanoacetyl indole and salicylaldehyde in the presence of Na2CO3 in water: methanol (1:1) is described. Wider substrate scope, high yields, operational simplicity, and simple purification process make the protocol highly applicable in the synthesis of 3-(1H-indole-3-carbonyl)-2H-chromen-2-ones. For the first time, in vitro antioxidant and antimicrobial activity was studied. Compounds 5e , 7a , and 7b exhibits good radical scavenging ability against DPPH free radical. Compounds 7b , 5f , and 5g possess lower EC50 values than the Standards AA and BHA and thus proving their high reducing power. Compounds 5d and 5f show good antibacterial activity against gram-positive bacteria (MRSA) while compounds 5c , 7a , and 7b exhibits good antibacterial activity against Bacillus sp. Compounds 5b and 5e show good antibacterial activity against gram negative bacterial strains (Escherichia coli, Klebsiella pneumoniae) and compounds 5g and 5h exhibits good antifungal activity against Candida albicans. 相似文献
8.
9.
N. Sujatha P. H. Cutler E. Kazes J. P. Rogers N. M. Miskovsky 《Applied Physics A: Materials Science & Processing》1983,32(2):55-61
In this paper the variational formalism is used to derive a set of equations describing the equilibrium configuration of a conducting fluid in an applied electric field. The validity of the variational equations is confirmed by application to the well-defined problem of concentric spherical electrodes. It is further shown that a cone, including the so-called Taylor cone used to model the equilibrium configuration of liquid metal ion sources, is inconsistent with the general equations. An analysis of the Taylor derivation suggests that reasons for the disagreement are the omission of the pressure difference term in the Laplace formula and use of only an approximate solution to the electrostatic cone problem. Finally a quasi-empirical method is suggested for the self-consistent solution of the variational equations. 相似文献
10.
Sujatha Asha Sasidharan Anjana Anns Maria Thomas Minu Elizabeth Thomas K. R. Rohit K. Keerthi Krishnan 《合成通讯》2019,49(2):256-265
In this study, we report a copper-catalyzed ligand-free Cadiot–Chodkiewicz coupling reaction. No additives or ligands are required for this Cu-catalyzed C(sp)–C(sp) coupling reaction of terminal alkynes with alkynyl halides. The low cost of copper catalyst, excellent yield of the products, suppression of side-products and mild reaction conditions are the major advantages of this protocol. 相似文献