R P SINGH

P P KUNDU

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Rheological properties of the methylcellulose gels in N , N -dimethyl formamide: Validity of scaling laws

Polymer Science - Series A

The rheological properties of methylcellulose in N,N-dimethylformamide (MC-DMF) gel are investigated to prepare extruded beads. The temperature scan under dynamic compression for various concentrations of MC in DMF is performed to investigate the rapture of MC gel at a constant frequency of 1 Hz. The morphological studies are performed using a scanning electron microscope (SEM) to analyze the size and shape of dried bead. However, during swelling studies, the MC beads have the capability to swell and retain a large amount of water > 9150% by weight and 9192.6% by volume. The mechanism of swelling is thermodynamically verified, where the enthalpy of hydration of initial layer of MC bead is negative. The newly defined electrostatic penta-pole model explains the anomalous behavior of urea release, where urea is assumed to be electrostatically bounded with the MC molecules. [Figure not available: see fulltext.]. © 2017, Springer-Verlag GmbH Germany, part of Springer Nature.

Rheologica Acta

Rheological and micro structural studies of methylcellulose solutions in N,N-dimethylformamide for preparation of extruded beads: controlled urea release

The phenomenon of thermoreversible gelation of methylcellulose (MC) in N, N-dimethyl formamide (DMF) is studied with respect to the earlier reported coil-Helix model. The proposed model in the MC-DMF system includes beads and rods in the existing coil helix model for gelation. In this new coil-helix-bead-rod system, the random coils are first converted to helixes on cooling, and these helixes may be the further aggregated into beads and rods. As observed under the SEM, the actual rod length is always greater than the size of a bead (2.5 μm). As observed from the modeling of gelation, the minimum number of helixes and beads in a chain has to be 14 x 109 and 5.6, respectively for gelation to occur. The process of gel-sol transition in the MC-DMF system (for 3 wt.% MC-88000) as studied through a differential scanning calorimeter (DSC) is divided into two parts, ranging from 71 to 92.9°C and 91.9 to 107.5°C. The primary peak at 75.6°C indicates the disintegration of strongly associated rods into weakly associated beads, whereas the secondary peak at 91.9°C indicates the disintegration of beads into a solution. © 2013 Springer Science+Business Media.

Journal of Polymer Research

DSC and micro structural studies of methylcellulose gels in N, N dimethylformamide

Journal of Applied Polymer Science

Thermogelation of methylcellulose from solution inN,N-dimethylformamide and characterization of the transparent gels

Effect of addition of surfactants on the rheology of gels from methylcellulose inN,N-dimethylformamide

Carbohydrate Polymers

Carbohydr. Polym.

Macromolecules

Thermal Gelation of Methylcellulose in Water:  Scaling and Thermoreversibility

Langmuir

Gel Network Structure of Methylcellulose in Water

Rheological properties of the methylcellulose gels in N,N-dimethyl formamide: Validity of scaling laws

Journal	Data powered by TypesetPolymer Science - Series A
Publisher	Data powered by TypesetMAIK NAUKA/INTERPERIODICA/SPRINGER
ISSN	0965-545X