Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography

This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γd s, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The n...

Full description

Saved in:
Bibliographic Details
Main Authors: Praveen Kumar Basivi, Visweswara Rao Pasupuleti, Tayssir Hamieh
Format: Article
Language:English
English
Published: Elsevier B.V 2021
Subjects:
Online Access:https://eprints.ums.edu.my/id/eprint/33301/1/Surface%20thermodynamic%20properties%20of%20sodium%20carboxymethyl%20cellulose%20by%20inverse%20gas%20chromatography%20.pdf
https://eprints.ums.edu.my/id/eprint/33301/2/Surface%20thermodynamic%20properties%20of%20sodium%20carboxymethyl%20cellulose%20by%20inverse%20gas%20chromatography%201.pdf
https://eprints.ums.edu.my/id/eprint/33301/
https://www.sciencedirect.com/science/article/pii/S2666821121001228
https://doi.org/10.1016/j.ceja.2021.100207
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Universiti Malaysia Sabah
Language: English
English
id my.ums.eprints.33301
record_format eprints
spelling my.ums.eprints.333012022-07-17T01:57:15Z https://eprints.ums.edu.my/id/eprint/33301/ Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography Praveen Kumar Basivi Visweswara Rao Pasupuleti Tayssir Hamieh QD1-999 Chemistry R5-920 Medicine (General) This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γd s, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The net retention volumes Vn of n-alkanes and polar solvents adsorbed on a sodium carboxymethyl cellulose (Na-CMC) polymer surface were determined at four temperatures 313.15K, 323.15K, 333.15 and -343.15K by IGC technique The London dispersive surface free energy component of Na-CMC was determined by using Dorris-Gray and DorrisGray-Hamieh methods, Van der Waals, Redlich-Kwong, Kiselev, geometric, cylindrical, spherical and Hamieh models. The more accurate value of γd s of Na-CMC was obtained by Hamieh model taking into account the thermal effect on the surface areas of molecules: γd s(T)(mJ /m2) = − 0.630 T(K) + 229.01 showing a maximal temperature TMax = 91◦C that can be considered as a new characteristic of the Na-CMC polymer. Above TMax, there is no dispersive component of the surface energy of the polymer surface. The specific interactions of Na-CMC particles were determined by using the various molecular models, and the vapor pressure, the boiling point, the topological index and the deformation polarization IGC methods. The obtained results clearly showed a strong Lewis basicity of Na-CMC (about seven times more basic than acidic polymer surface). It was proved that the IGC methods and models do not give similar results. The thermal model gave the most accurate result of the Lewis acid-base properties of Na-CMC surface. Elsevier B.V 2021 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/33301/1/Surface%20thermodynamic%20properties%20of%20sodium%20carboxymethyl%20cellulose%20by%20inverse%20gas%20chromatography%20.pdf text en https://eprints.ums.edu.my/id/eprint/33301/2/Surface%20thermodynamic%20properties%20of%20sodium%20carboxymethyl%20cellulose%20by%20inverse%20gas%20chromatography%201.pdf Praveen Kumar Basivi and Visweswara Rao Pasupuleti and Tayssir Hamieh (2021) Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography. Chemical Engineering Journal Advances, 9 (100207). pp. 1-10. ISSN 2666-8211 https://www.sciencedirect.com/science/article/pii/S2666821121001228 https://doi.org/10.1016/j.ceja.2021.100207
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
English
topic QD1-999 Chemistry
R5-920 Medicine (General)
spellingShingle QD1-999 Chemistry
R5-920 Medicine (General)
Praveen Kumar Basivi
Visweswara Rao Pasupuleti
Tayssir Hamieh
Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
description This study constitutes a new development of surface thermodynamic methods to determine the London dispersive surface free energy component γd s, the specific free energy of adsorption and the Lewis acid-base properties of polymers by using inverse gas chromatography (IGC) at infinite dilution. The net retention volumes Vn of n-alkanes and polar solvents adsorbed on a sodium carboxymethyl cellulose (Na-CMC) polymer surface were determined at four temperatures 313.15K, 323.15K, 333.15 and -343.15K by IGC technique The London dispersive surface free energy component of Na-CMC was determined by using Dorris-Gray and DorrisGray-Hamieh methods, Van der Waals, Redlich-Kwong, Kiselev, geometric, cylindrical, spherical and Hamieh models. The more accurate value of γd s of Na-CMC was obtained by Hamieh model taking into account the thermal effect on the surface areas of molecules: γd s(T)(mJ /m2) = − 0.630 T(K) + 229.01 showing a maximal temperature TMax = 91◦C that can be considered as a new characteristic of the Na-CMC polymer. Above TMax, there is no dispersive component of the surface energy of the polymer surface. The specific interactions of Na-CMC particles were determined by using the various molecular models, and the vapor pressure, the boiling point, the topological index and the deformation polarization IGC methods. The obtained results clearly showed a strong Lewis basicity of Na-CMC (about seven times more basic than acidic polymer surface). It was proved that the IGC methods and models do not give similar results. The thermal model gave the most accurate result of the Lewis acid-base properties of Na-CMC surface.
format Article
author Praveen Kumar Basivi
Visweswara Rao Pasupuleti
Tayssir Hamieh
author_facet Praveen Kumar Basivi
Visweswara Rao Pasupuleti
Tayssir Hamieh
author_sort Praveen Kumar Basivi
title Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_short Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_full Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_fullStr Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_full_unstemmed Surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
title_sort surface thermodynamic properties of sodium carboxymethyl cellulose by inverse gas chromatography
publisher Elsevier B.V
publishDate 2021
url https://eprints.ums.edu.my/id/eprint/33301/1/Surface%20thermodynamic%20properties%20of%20sodium%20carboxymethyl%20cellulose%20by%20inverse%20gas%20chromatography%20.pdf
https://eprints.ums.edu.my/id/eprint/33301/2/Surface%20thermodynamic%20properties%20of%20sodium%20carboxymethyl%20cellulose%20by%20inverse%20gas%20chromatography%201.pdf
https://eprints.ums.edu.my/id/eprint/33301/
https://www.sciencedirect.com/science/article/pii/S2666821121001228
https://doi.org/10.1016/j.ceja.2021.100207
_version_ 1760231145535963136