Date of Publication

11-25-2023

Document Type

Master's Thesis

Degree Name

Master of Science in Chemistry

Subject Categories

Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Advisor

David P. Penaloza, Jr.

Defense Panel Chair

Drexel H. Camacho

Defense Panel Member

Joel E. Garcia
Julius Leaño Jr.

Abstract/Summary

This study investigates the feasibility of utilizing commercial clays such as smectite (Sm), mica (Mi), kaolinite (Kao), and laponite (Lap), as alternative, non-surfactant based dispersing agents in the preparation of aqueous dispersions of phthalocyanine green (PG) and quinophthalone yellow (QY). The stability of the dispersion was determined using UVVis spectroscopic measurements after subjecting the dispersions to simulated aging through accelerated sedimentation. Preliminary tests at a low concentration (~0.1% w/w) demonstrated the dispersing capabilities of the clay with smectite and laponite-based pigment dispersion exhibiting the highest stabilities. Differences in the dispersing capabilities of the clays used were attributed to their structural diversity. Among the clays used, Sm resulted in acceptable pigment dispersion using 0.5% to 5% Sm w/w. Sm-assisted pigment dispersions prepared with ~15% pigment loading showed stable and good pigment dispersions, enough to be compared to an industry standard prepared based on conventional surfactant-formulated pigment dispersion.

Abstract Format

html

Language

English

Format

Electronic

Keywords

Pigments; Clay minerals; Green chemistry

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Embargo Period

11-23-2024

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