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Saha, Bidyut B.,Alam, K.C. Amanul,Koyama, Shigeru,Lee, Jong Boong 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
A conventional silica gel/water adsorption chiller has been analyzed numerically. A novel non-dimensional mathematical model has been presented to analyze the design effect of different components of an adsorption chiller. The design parameters of this system are characterized by the number of transfer unit, NTU, of different components and the inert material alpha number, a of different components of the systems. Results show that condenser NTU_(a) has the most influential effect on the system performance, which is followed by adsorber NTU_(e). It is also seen that coefficient of performance (COP) and non-dimensional specific cooling capacity increases with the increase of NTU_(a) and NTU_(e), but decreases with the increase of inert material alpha number. A therm-economic data of the adsorption chiller and some other heat pump systems those are in practical operation are also presented.
Ghosh, Sumanta K.,Saha, Rumpa,Ghosh, Aniruddha,Basu, Ankita,Mukherjee, Kakali,Saha, Indrajit,Saha, Bidyut Korean Chemical Society 2012 대한화학회지 Vol.56 No.6
Under pseudo-first order conditions, the monomeric species of Cr(VI) was found to be kinetically active in the absence of phenanthroline (phen) whereas in the phen-promoted path, the Cr(VI)-phen complex undergoes a nucleophilic attack by etane-1,2-diol to form a ternary complex which subsequently experience a redox decomposition leading to hydroxy ethanal and Cr(III)-phen complex. The effect of the cationic surfactant (CPC), anionic surfactant (SDS) and neutral surfactant (TX-100) on the unpromoted and phen-promoted path have been studied. Micellar effects have been explained by considering the preferential partitioning of reactants between the micellar and aqueous phase. Combination of TX-100 and phenanthroline will be the ideal for chromic acid oxidation of ethane-1,2-diol in aqueous media.
Rana, Bidyut Kumar,Mishra, Snehasis,Sarkar, Deblina,Mondal, Tapan Kumar,Seth, Saikat K.,Bertolasi, Valerio,Das Saha, Krishna,Bielawski, Christopher W.,Isab, Anvarhusein A.,Dinda, Joydev The Royal Society of Chemistry 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.13
<P>To elucidate the intrinsic biological activities displayed by platinum <I>versus</I> gold-based organometallic reagents, the isoelectronic and isostructural square planar complexes [Pt(C∩N)(C)Cl][PF6] (2) and [Au(C∩N)(C)Cl][PF6]2 (3), which are supported by a common N-heterocyclic carbene, 1-methyl-2-pyridin-2-yl-2<I>H</I>-imidazo[1,5-<I>a</I>]pyridin-4-ylidene (1), were synthesized. The complexes were characterized using a range of spectroscopic techniques as well as single crystal X-ray diffraction and a series of computational studies were also performed to gain additional insight into their fundamental electronic bonding structures. The cytotoxicities of the complexes were tested <I>in vitro</I> against non-small lung carcinoma (A549), colorectal carcinoma (HCT-116) and human hepatocellular carcinoma (HepG2) cell lines. The measured IC50 values showed that the Au(iii)-NHC complex is more potent than its Pt analogue.</P>
Pintu Sar,Bidyut Saha,Aniruddha Ghosh,Susanta Malik,Dhiman Ray,Bijan Das 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
Oxidation of the three isomeric pentanols by potassium dichromate in aqueous acidic medium wasinvestigated spectrophotometrically at 25 C. The oxidation leads to the formation of correspondingcarbonyl products as identified by 1H NMR measurement and other techniques. The effects of cationic(cetylpyridinium chloride, CPCl), anionic (sodium dodecylsulphate, NaDS) and nonionic surfactant(polyoxyethylene octyl phenyl ether, TX-100) on reaction kinetics were studied. Moreover the catalyticeffect of surfactant in presence of three heteroaromatic nitrogen bases: 2-picolinic acid (2-PA), 2,20-bipyridyl (2,20-bipy) and 1,10-phenanthroline (1,10-phen) on the oxidation were also investigated. Thevalue of the rate constant in promoted and unpromoted reaction has been found to be higher in NaDSthan in TX-100 and CPCl micellar medium. Conductivity and tensiometry measurements were carried outto determine critical micellization concentration and free energy of micellization (DGm) of the usedsurfactant in presence of three pentanols. Among the different surfactant and promoter the combinationof 2,20-bipy and NaDS is efficient to exhibit1000 fold rate enhancement for oxidation of 1-pentanol andit is ‘selective’ over the rest of two pentanols oxidation.
Aniruddha Ghosh,Bidyut Saha,Rumpa Saha 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Oxidation of propanol by chromic acid produces propionaldehyde under kinetic condition [propa-nol]T≫ [Cr(VI)]T. This oxidation reaction is performed also in presence of micellar catalysts (anionic,cationic and neutral) and hetero-aromatic nitrogen bases promoters (picolinic acid, 2,20-bipyridine,1,10-phenanthroline) in aqueous media. The product is confirmed by 2,4-DNP test and 1H NMRspectroscopy. Anionic surfactant sodium dodecyl sulphate (SDS), neutral surfactant triton X-100 (TX-100) accelerated the reaction both in presence and absence of promoters whereas cationic surfactant Ncetylpyridinium chloride (CPC) inhibited the reaction. Combination of SDS and bipy is found to be themost efficient for this oxidation.
Mukherjee, Kakali,Saha, Bidyut Korean Chemical Society 2013 대한화학회지 Vol.57 No.4
Oxidation of glutamic acid is performed in aqueous acid media at $30^{\circ}C$ under the kinetic condition [glutamic acid]$_T{\gg}[Cr(VI)]_T$. Effect of combination of micellar catalyst (SDS, TX-100) and promoter (PA, bpy, phen) has been studied. Among the promoters phen accelerates the reaction most in aqueous media. But the rate acceleration is small in the case. Combination of promoter and catalyst produces much better result. Maximum rate enhancement occurs in presence of the combination of bpy and SDS.
Ghosh, Aniruddha,Saha, Rumpa,Ghosh, Sumanta K.,Mukherjee, Kakali,Saha, Bidyut Korean Chemical Society 2013 대한화학회지 Vol.57 No.6
In the present investigation, kinetic studies of oxidation of formic acid with and without catalyst and promoter in aqueous acid media were studied under the pseudo-first order conditions [formic acid]T ${\gg}[Cr(VI)]_T$ at room temperature. In the 1,10-phenanthroline (phen) promoted path, the cationic Cr(VI) phen complex is the main active oxidant species undergoes a nucleophilic attack by the substrate to form a ternary complex which subsequently experiences a redox decomposition through several steps leading to the products $CO_2$ and $H_2$ along with the Cr(III) phen complex. The anionic surfactant (i.e., sodium dodecyl sulfate, SDS) and neutral surfactant (i.e., Triton X-100, TX-100) act as catalyst and the reaction undergo simultaneously in both aqueous and micellar phase with an enhanced rate of oxidation in the micellar phase. Whereas the cationic surfactant (i.e., N-cetyl pyridinium chloride, CPC) acts as an inhibitor restricts the reaction to aqueous phase. The observed net enhancement of rate effects has been explained by considering the hydrophobic and electrostatic interaction between the surfactants and reactants. The neutral surfactant TX-100 has been observed as the suitable micellar catalyst for the phen promoted chromic acid oxidation of formic acid.