@article { ISI:000242327500019, title = {Factors influencing decomposition of H2O2 over supported Pd catalyst in aqueous medium}, journal = {Journal of Molecular Catalysis A-Chemical}, volume = {260}, number = {1-2}, year = {2006}, month = {DEC}, pages = {115-120}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Since H2O2 decomposition can result in selectivity/yield loss in the direct H2O2 synthesis process from H-2 and O-2 over supported Pd catalysts, it is important to have an enhanced understanding about the factors affecting the H2O2 decomposition reaction. Herein, detailed studies have been undertaken to investigate the influence of different factors, such as (a) nature and concentration of acid in reaction medium, (b) nature and concentration of halide in presence and absence of acid in reaction medium, (c) pretreatment procedures and (d) catalyst modification by incorporation of different halides, on the H2O2 decomposition reaction over a 5\% Pd/C catalyst in aqueous medium at 25 degrees C. This study has shown that the H2O2 decomposition activity is profoundly influenced by all the above factors. The effectiveness of the acids in suppressing the H2O2 decomposition activity decreased in the following order: hydroiodic acid \> hydrobromic acid \> hydrochloric acid \>\> acetic acid \> phosphoric acid \> sulfuric acid \> perchloric acid. The ability of the acid to decrease the H2O2 decomposition activity was found to very strongly depend on the nature of its associated anion. Halides, such as iodide, bromide and chloride were particularly effective in suppressing the H2O2 decomposition activity. Oxidation pretreatment of the catalyst was found to strongly suppress its H2O2 decomposition activity, while a reduction treatment was found to promote its activity. A gradual decrease in the H2O2 decomposition activity of the catalyst was observed with each successive usage due to in situ sub-surface oxidation of Pd by H2O2. Halide incorporation either via the reaction medium or prior catalyst modification had a similar qualitative effect on the H2O2 decomposition activity. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {acid, H2O2 decomposition, H2O2 synthesis, halides, Pd catalysts, pretreatment}, issn = {1381-1169}, doi = {10.1016/j.molcata.2006.07.009}, author = {Choudhary, Vasant R. and Samanta, C. and Choudhary, Tushar V.} } @article { ISI:000308345800010, title = {Solvent-free oxidation of aldehydes to acids by TBHP using environmental-friendly -exchanged Mg-Al hydrotalcite catalyst}, journal = {Journal of Chemical Sciences}, volume = {124}, number = {4}, year = {2012}, month = {JUL}, pages = {835-839}, publisher = {INDIAN ACAD SCIENCES}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, abstract = {

A number of hydrotalcite (Mg-Al, Mn-Al, Co-Al, Ni-Al, Mg-Fe, Mg-Cr and Cu-Al) catalysts, with or without MnO-exchange, were evaluated for their performance in the solvent-free oxidation of benzaldehyde to benzoic acid by tert-butyl hydroperoxide under reflux in the absence of any solvent. The MnO-exchanged Mg-Al-hydrotalcite (Mg/Al = 10) showed high activity in the oxidation of different aromatic and aliphatic aldehydes to their corresponding acids and also showed excellent reusability in the oxidation process which is environmental-friendly.

}, keywords = {acid, Aldehyde, MnO4-1-exchanged Mg-Al-hydrotalcite catalyst, Oxidation, TBHP}, issn = {0974-3626}, doi = {10.1007/s12039-012-0268-7}, author = {Choudhary, Vasant R. and Dumbre, Deepa K. and Narkhede, Vijay S.} } @article {43890, title = {Multifunctional inulin tethered silver-graphene quantum dots nanotheranostic module for pancreatic cancer therapy}, journal = {Material Science and Engineering C- Materials for Biological Application}, volume = {78}, year = {2017}, month = {SEP}, chapter = {1203-1211}, abstract = {

Cancer nanotechnology is an emerging area of cancer diagnosis and therapy. Although considerable progress has been made for targeted drug delivery systems to deliver anticancer agents to particular site of interest, new nanomaterials are frequently being developed and explored for better drug delivery efficiency. In the present work, we have explored a novel nanoformulation based on silver-graphene quantum dots (Ag-GQDs) nanocomposite for its successful implementation for pancreatic cancer specific drug delivery in wistar rats. Carboxymethyl inulin (CMI); a modified variant of natural polysaccharide inulin is tethered with the nanocomposite via carbodiimide coupling to enhance the biocompatibility of nanoformulation. Experiments are performed to investigate the cytotoxicity reduction of silver nanoparticles after inulin tethering as well as anticancer efficacy of the system using 5-Fluorouracil (5-FU) as model drug. SEM, TEM, FT-IR, UV-vis, photoluminescence and anti proliferative assays (MTT) are performed for characterisation of the nanocomposite. Hyaluronic acid (HA) is conjugated as targeting moiety for CD-44 (cancer stem cell marker) to fabricate a complete targeted drug delivery vehicle specific for pancreatic cancer. In the present work two prime objectives were achieved; mitigation the toxicity of silver nanoparticles by inulin coating and it{\textquoteright}s in vivo application for pancreatic cancer. (C) 2017 Elsevier B.V. All rights reserved.

}, keywords = {acid, Dextran, Drug-delivery, graphene quantum dots, Inulin, Nanocomposite, Nanocomposites, Nanoparticles, Pancreatic Cancer, Silver nanoparticle, Strategies, Systems, Targeted Drug Delivery}, issn = {0928-4931}, doi = {10.1016/j.msec.2017.03.176}, author = {Joshi, Preeti Nigam and Agawane, Sachin and Agawane, Sachin and Agawane, Sachin and Sarkar, Dhiman and Sarkar, Dhiman} } @article {43901, title = {Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone}, journal = {Journal of Chemical Sciences}, volume = {129}, year = {2017}, month = {SEP}, chapter = {1461-1468}, abstract = {

Synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology is presented. Synthesised polyesters consist of bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene as a mesogen and aliphatic diacid chloride as flexible spacer. The length of oligomethylene units in the polymer was varied from the trimethylene to the dodecamethylene groups. Synthesized polyesters were characterized by differential scanning calorimetry and optical microscopy. The transition temperatures and thermodynamic properties were studied for all these polymers. These polyesters exhibited thermotropic liquid crystalline behavior and showed nematic texture except decamethylene spacer. Decamethylene spacer based polyester showed marble texture of smectic C. Mesophase stability of these polyesters was higher than (except first heating cycle of PE-1).\ 

SYNOPSIS The present study deals with the synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology.

}, keywords = {acid, Aliphatic Flexible Spacers Main-chain, Aromatic Mesogen, Elastomer, Morphology, Polydomain, Polymers, Thermotropic Liquid Crystalline Polyesters, Units}, doi = {10.1007/s12039-017-1342-y}, author = {Manurkar, Nagesh and More, Sayaji and Mulani, Khudbudin and Ganjave, Nitin and Chavan, Nayaku} }