NDLI: Determination of the surface properties of untreated and chemically treated kaolinites by inverse gas chromatography

Content Provider	Springer Nature Link
Author	Kubilay, Ş. Gürkan, R. Savran, A. Yalçinkaya, Z.
Copyright Year	2006
Abstract	Inverse gas chromatography is used to study the surface properties of the untreated and chemically treated kaolinite samples. Changes in the enthalpy of adsorption for a variety of probes and in the surface energy of clays are measured and the effect of modification of the natural clay after chemical treatment with Na2CO3 is determined. The surface energy of the natural clay increased by the modification due to an increase in the surface area. It can be concluded that the dispersive component of surface free energy, γ s d , decreases with temperature in the 200–275°C temperature range for both samples. Temperature coefficients of γ s d for untreated and modified kaolinites are −0.1185 and −0.3966 mJ/(m2 °C) with the correlation coefficients (R 2) of 0.8479 and 0.965, respectively. From the retention data for polar probes at infinite dilution, information on the accessibility of surface sites to the probes and on the acid-base character of the surface is obtained. The specific free energy of adsorption, the specific enthalpy of adsorption (ΔH sp), and the specific entropy of adsorption of polar probes on initial and modified kaolinites are determined. The ΔH sp values correlated with the donor numbers and modified acceptor numbers of the probes to quantify the acidity (K A) and basicity (K D) parameters of clay surfaces. The values of K A and K D for initial and modified kaolinites are determined to be 0.1202 and 0.2803; 0.0130 and 0.0408 with the correlation coefficients of −0.9805 and −0.9782, respectively. The unmodified clay sample indicated a more acidic character, while the modified clay sample conferred a largely basic character. Consequently, the predominant surface basicity of the modified kaolinite agrees with expectation, bearing in mind the treatment with Na2CO3, taking into consideration that such a modification contributes to a decrease in the hydrophilicity of the surface and also results in the surface showing only weak Lewis acidity.
Starting Page	274
Ending Page	284
Page Count	11
File Format	PDF
ISSN	1061933X
Journal	Colloid Journal
Volume Number	68
Issue Number	3
e-ISSN	16083067
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Physical and Theoretical Chemistry Surfaces and Interfaces

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Determination of nanoparticle sizes by X-ray diffraction

Equilibrium thin liquid films

Dusty-gas model. Allowance for surface forces

On the gas-separation properties of two-layer porous membranes

Determination of surfactant molecular volume by atomic force microscopy

Pervaporation properties of thermally modified chitosan films

Probing of chemically modified silica surfaces by solvatochromic pyridinium N-phenolate betaine indicators

Formation and Properties of Microemulsions Stabilized by Ethoxylated Glycerides

Thermogravimetric determination of specific surface area for soil colloids

Determination of the surface properties of untreated and chemically treated kaolinites by inverse gas chromatography

Similar Documents

Determination of nanoparticle sizes by X-ray diffraction

Equilibrium thin liquid films

Dusty-gas model. Allowance for surface forces

On the gas-separation properties of two-layer porous membranes

Determination of surfactant molecular volume by atomic force microscopy

Pervaporation properties of thermally modified chitosan films

Probing of chemically modified silica surfaces by solvatochromic pyridinium N-phenolate betaine indicators

Formation and Properties of Microemulsions Stabilized by Ethoxylated Glycerides

Thermogravimetric determination of specific surface area for soil colloids

Determination of the surface properties of untreated and chemically treated kaolinites by inverse gas chromatography