Cellulose Nanocrystal Stabilized Pickering Emulsions

Adhikari, Sangeet and Adhikari, Sangeet (2017) Cellulose Nanocrystal Stabilized Pickering Emulsions. Undergraduate thesis, under the direction of Esteban Ureña-Benavides from Chemical Engineering, The University of Mississippi.

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The use of Pickering Emulsions in place of conventional surfactants has opened new doors in fields like pharmacy, cosmetology, and oil and gas industry. Pickering emulsions using Cellulose Nanocrystals (CNCs) are generally stable to heating in a wide range of temperatures and show great stability against salt and pH changes. The management of water resources in the United States has been a challenge. The injection of water in aging oil fields and unconventional tight-gas, shale-gas, and coal bed-fields often generate substantial amounts contaminated wastewater. This research project is expected to help future efforts in promoting oil biodegradation in emulsified mixtures. Here, we are correlating viscosity of aqueous phases of 0.4, 0.8, and 1 wt.% CNC in American Petroleum Institute (API) brine (2 wt.% CaCl2 and 8 wt.% NaCl) and Synthetic Seawater (SSW) to explain the high stability of a Pickering emulsion stabilized by CNCs. Emulsion stability was assessed through creaming front analysis and optical microscopy measurements. The most stable emulsions over six months had aqueous phases with high viscosity; lower viscosities were found for emulsions that broke at room temperature. Highly viscous interfacial films retard the rate of oil-film drainage during the coalescence of the water droplets by providing a mechanical barrier to coalescence, which can lead to a reduction in the rate of emulsion breakdown.

Item Type: Thesis (Undergraduate)
Creators: Adhikari, Sangeet and Adhikari, Sangeet
Student's Degree Program(s): B.S. in Chemical Engineering
Thesis Advisor: Esteban Ureña-Benavides
Thesis Advisor's Department: Chemical Engineering
Institution: The University of Mississippi
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Depositing User: Sangeet Adhikari
Date Deposited: 14 May 2018 19:37
Last Modified: 14 May 2018 19:37
URI: http://thesis.honors.olemiss.edu/id/eprint/1190

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