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Shanmuka Chalamuri - Thesis.pdf (6.82 MB)

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The Evaluation of the Effect of Anionic and Cationic Surfactants on the Hindered Settling of Light Calcium Carbonate Suspensions

Chalamuri, Shanmuka Harish
http://rave.ohiolink.edu/etdc/view?acc_num=mco1418602604

Abstract Details

2014, Master of Science (MS), University of Toledo, Pharmaceutical Sciences (Industrial Pharmacy).
The objective of this study is to evaluate the effect of anionic and cationic surfactants on the hindered settling behavior of simple light calcium carbonate suspensions. Various concentrations of both sodium lauryl sulfate (SLS) and benzalkonium chloride (BZK), such as 0.025%, 0.05%, 0.1% were prepared and light calcium chloride was suspended in these solutions. The hindered settling behavior was studied by conducting sedimentation experiments. The particle sizes were calculated using the modified Stokes’ equations including those of Steinour, Richardson & Zaki and Dollimore & McBride. The morphology of the particles and the effect of various surfactants on them were studies using SEM. The studies showed an increase in particle size due to flocculation when sodium lauryl sulfate and also showed a substantial decrease in particle size due to deflocculation when benzalkonium chloride was used. Permeability data indicate that, in suspensions with SLS, there is a decrease in permeability and porosity due to an increase in flocculation with an increase in the concentration of the surfactant. The suspensions with BZK showed an increase in permeability and porosity with increase in concentration. Thermal analysis was carried out using DSC to study the effect of surfactants on the bound and unbound water content. It was revealed an increased amount of bound water with an increase in concentration of SLS and a decrease in amount of bound water with increase in concentration of BZK. Zeta potential studies proved that the increase in concentration of SLS increases flocculation and particle size and inversely when suspended in benzalkonium chloride solution, the particles deflocculate and particle size decreased. PXRD studies revealed that the addition of surfactants does not affect the crystallinity of the particles.
Alexander Kenneth, Dr. (Advisor)
Sai Hanuman Sagar Boddu, Dr. (Committee Member)
Caren Steinmiller, Dr. (Committee Member)
136 p.
Pharmaceuticals; Pharmacy Sciences
Hindered settling; light calcium carbonate; calcium carbonate; sodium lauryl sulfate; benzalkonium chloride

Recommended Citations

Citations

  • Chalamuri, S. H. (2014). The Evaluation of the Effect of Anionic and Cationic Surfactants on the Hindered Settling of Light Calcium Carbonate Suspensions [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=mco1418602604

    APA Style (7th edition)

  • Chalamuri, Shanmuka Harish. The Evaluation of the Effect of Anionic and Cationic Surfactants on the Hindered Settling of Light Calcium Carbonate Suspensions. 2014. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=mco1418602604.

    MLA Style (8th edition)

  • Chalamuri, Shanmuka Harish. "The Evaluation of the Effect of Anionic and Cationic Surfactants on the Hindered Settling of Light Calcium Carbonate Suspensions." Master's thesis, University of Toledo, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=mco1418602604

    Chicago Manual of Style (17th edition)

mco1418602604
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This open access ETD is published by University of Toledo Health Science Campus and OhioLINK.