Time filter

Source Type

Jorhāt, India

Saikia B.,Dibrugarh University | Borah P.,Bahona College
RSC Advances | Year: 2015

We have developed a novel protocol to realize the Dakin reaction in a more greener way. In fact, by the use of H2O2-WERSA, we can oxidize aromatic arylaldehydes to phenols at room temperature. It is remarkable that the catalytic system does not require activation or any toxic ligand, additive/promoter, transition metal catalyst, base, organic solvent and so on. A range of substituted hydroxylated benzaldehydes were screened to investigate the scope of this protocol. © The Royal Society of Chemistry 2015. Source

Saikia B.,Dibrugarh University | Borah P.,Bahona College | Barua N.C.,CSIR - Central Electrochemical Research Institute
Green Chemistry | Year: 2015

Without using any transition metal catalyst, ligand, base, toxic or hazardous reagent, additives/promoters and organic solvent, green Dakin reactions have been successfully carried out by using H2O2 in a natural feedstock extract. The reaction proceeds in neat 'Water Extract of Banana' (WEB) at room temperature under aerobic conditions in very short reaction times and, therefore, it is an evergreen and environmentally sound alternative to the existing protocols for the Dakin reaction. In our system, the reaction was found to afford excellent yield for the desired product with different electron-withdrawing and electron-donating hydroxylated benzaldehydes. This journal is © The Royal Society of Chemistry. Source

Chaliha S.,Bahona College | Borah M.N.,D R College | Sarmah P.C.,North East Institute of Science and Technology | Rahman A.,Gauhati University
International Journal of Thermophysics | Year: 2010

Schottky barrier junctions of Al-doped n-type Zinc selenide (ZnSe) thin films of doping concentrations up to 9.7×10 14cm -3 have been fabricated with Au and Ni electrodes on glass substrates by sequential thermal evaporation. All of the junctions of different doping concentrations exhibited rectifying current-voltage characteristics with a non-saturating reverse current. From the current-voltage characteristics, the different junction parameters such as ideality factor, saturation current density, series resistance, etc., were measured. Both types of junctions were found to possess a high ideality factor and a high series resistance. The barrier heights of the junctions were measured from Richardson plots and found to be around 0.8eV. The structures were found to exhibit a poor photovoltaic effect with a fill factor not greater than 0.4. The diode quality as well as the photovoltaic performance of the diodes were improved following a short heat treatment in vacuum. © Springer Science+Business Media, LLC 2009. Source

Borah M.N.,Dr College | Baruah B.J.,Dr College | Chaliha S.,Bahona College | Gogoi D.P.,Bahona College | And 2 more authors.
Journal of Experimental Nanoscience | Year: 2013

Nanocrystalline CdSe films are deposited on glass substrates by the chemical bath deposition method at different molarities and at room temperature. The structural parameters such as lattice constant, internal strain and dislocation density of CdSe nanocrystals are measured from X-ray diffractrograms using the Williamson-Hall plot. The average crystallite size of prepared films are found to be from 9.5 to 26 nm. The prepared films are found to be under compressive strain with very high dislocation density of the order of 1017 line m-2. © 2013 Copyright Taylor and Francis Group, LLC. Source

Discover hidden collaborations