<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rizvi, Masood Ahmad</style></author><author><style face="normal" font="default" size="100%">Dangat, Yuvraj B.</style></author><author><style face="normal" font="default" size="100%">Shams, Tahir</style></author><author><style face="normal" font="default" size="100%">Khan, Khaliquz Zaman</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Complexation key to a pH locked redox reaction</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Chemical Education</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Analytical Chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Aqueous Solution Chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Coordination Compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Oxidation/Reduction</style></keyword><keyword><style  face="normal" font="default" size="100%">pH</style></keyword><keyword><style  face="normal" font="default" size="100%">Physical Chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Potentiometry</style></keyword><keyword><style  face="normal" font="default" size="100%">Second-Year Undergraduate</style></keyword><keyword><style  face="normal" font="default" size="100%">Thermodynamics</style></keyword><keyword><style  face="normal" font="default" size="100%">Titration/Volumetric Analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Upper-Division Undergraduate</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2016</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">2</style></number><publisher><style face="normal" font="default" size="100%">AMER CHEMICAL SOC</style></publisher><pub-location><style face="normal" font="default" size="100%">1155 16TH ST, NW, WASHINGTON, DC 20036 USA</style></pub-location><volume><style face="normal" font="default" size="100%">93</style></volume><pages><style face="normal" font="default" size="100%">355-361</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;An unfavorable pH can block a feasible electron transfer for a pH dependent redox reaction. In this experiment, a series of potentiometric titrations demonstrate the sequential loss in feasibility of iron(II) dichromate redox reaction over a pH range of 0-4. The pH at which this reaction failed to occur was termed as a pH locked reaction. The comparative ability of 10 selected iron binding ligands with varied propensity for the redox potential modification of Fe(III)/Fe(II) redox couple to restore/unlock the pH locked redox reaction is shown using potentiometric titrations. The spectrophotometric speciation analysis of Fe(III) Tiron complexation with pH was carried out to explain the differing ability of EDTA and Tiron to unlock the reaction under different pH Conditions. The experiment illustrates how environmental, biological redox reactions avoid severe laboratory conditions to occur and can be explored in the design of novel redox systems for natural attenuation of environmental toxins to their non- or lesser-toxic forms. The experiment also demonstrates prudent laboratory practice for safe waste disposal.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><custom3><style face="normal" font="default" size="100%">&lt;p&gt;Foreign&lt;/p&gt;</style></custom3><custom4><style face="normal" font="default" size="100%">1.225</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Dubey, Parul</style></author><author><style face="normal" font="default" size="100%">Kumar, Sugam</style></author><author><style face="normal" font="default" size="100%">Ravindranathan, Sapna</style></author><author><style face="normal" font="default" size="100%">Vasudevan, Sahana</style></author><author><style face="normal" font="default" size="100%">Aswal, Vinod K.</style></author><author><style face="normal" font="default" size="100%">Rajamohanan, Pattuparambil R.</style></author><author><style face="normal" font="default" size="100%">Nisal, Anuya</style></author><author><style face="normal" font="default" size="100%">Prabhune, Asmita</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">pH dependent sophorolipid assemblies and their influence on gelation of silk fibroin protein</style></title><secondary-title><style face="normal" font="default" size="100%">Materials Chemistry and Physics</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Assemblies</style></keyword><keyword><style  face="normal" font="default" size="100%">Nuclear magnetic resonance spectroscopy</style></keyword><keyword><style  face="normal" font="default" size="100%">pH</style></keyword><keyword><style  face="normal" font="default" size="100%">Silk fibroin</style></keyword><keyword><style  face="normal" font="default" size="100%">Small angle neutron scattering</style></keyword><keyword><style  face="normal" font="default" size="100%">Sophorolipid</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2018</style></year><pub-dates><date><style  face="normal" font="default" size="100%">JAN </style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">203</style></volume><pages><style face="normal" font="default" size="100%">9-16</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Sophorolipid (SL), a bio-derived surfactant is an excellent gelling agent for natural fibrous protein, silk fibroin (SF) leading to potential biomedical applications. Interaction of SF with SL has been shown to accelerate the formation of hydrogel with the rate being dependent on the form of SL used. Here, we examine the effect of pH on SL-SF interaction and gel formation by employing rheology, fluorescence spectroscopy, SANS and NMR. The results indicate that the size of SL assemblies decrease as pH increases from acidic to alkaline and significantly impacts the association of SL and SF. The association of SF and SL is mainly via hydrophobic interactions, with the SL molecules forming bead like structures along the SF chain. The increased charge on the acidic form of SL at higher pH results in greater repulsion between acidic SL molecules, which are bound to the hydrophobic sites of SF, leading to rapid chain unfolding and subsequent gelation. (C) 2017 Elsevier B.V. All rights reserved.&lt;/p&gt;</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">2.084</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ughade, Supriya</style></author><author><style face="normal" font="default" size="100%">Joshi, Bhavana</style></author><author><style face="normal" font="default" size="100%">Poddar, Pankaj</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Formation of zircon-type DyCrO4 and its magnetic properties</style></title><secondary-title><style face="normal" font="default" size="100%">Ceramics International</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Complexing agent</style></keyword><keyword><style  face="normal" font="default" size="100%">DyCrO4</style></keyword><keyword><style  face="normal" font="default" size="100%">Formation mechanism</style></keyword><keyword><style  face="normal" font="default" size="100%">Hydrolytic sol-gel method</style></keyword><keyword><style  face="normal" font="default" size="100%">pH</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2022</style></year><pub-dates><date><style  face="normal" font="default" size="100%">SEP</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">48</style></volume><pages><style face="normal" font="default" size="100%">24666-24676</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;
	The formation mechanism of hydrolytic sol-gel synthesized DyCrO4 with a complexing agent in acidic and basic mediums is thoroughly studied. The role of complexing agents and pH on phase formation temperature is also intensively investigated. The formation temperature for DyCrO4 is similar to 500 degrees C in the absence and presence of complexing agents such as oxalic acid and ethylenediaminetetraacetic acid (EDTA) at pH 10. When critic acid is used, the DyCrO4 forms with Cr2O3 impurity. The crystallite size in the presence of a complexing agent in the basic medium is similar to 55 nm which is small as compared to only ammonia solution. The various reaction modes lead to tetragonal zircon-type DyCrO4 at similar to 500 degrees C, transforming into orthorhombic perovskite DyCrO3 at 800 degrees C. The magnetization curve shows the ferromagnetic behavior of DyCrO4 below transition temperature T-c similar to 21 K. This low T-c makes nanocrystalline DyCrO4 a potential material for cryogenic applications.&lt;/p&gt;
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