Title

Synthesis and characterization of cholesteric cellulose nanocrystals from cladophora rupestris

Date of Publication

2016

Document Type

Master's Thesis

Degree Name

Master of Science in Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Adviser

Drexel H. Camacho

Abstract/Summary

The study successfully synthesized and characterized cholesteric cellulose nanocrystals from Cladophora rupestris and cholesterol via click chemistry. The study consisted of six stages: extraction of cellulose from Cladophora rupestris, isolation of cellulose nanocrystals from cellulose, synthesis of the azide-bearing cellulose nanocrystals, synthesis of Opropargylcholesterol, synthesis of cellulose nanocrystals-cholesterol click product and characterization of the cellulosic samples. SEM and TEM revealed a web-like network of CNCs and its dimensions: 23.99 (4.85) nm for the diameter and 498 (114) for the length. XRD measurements showed 93.97% crystallinity for CNCs. FTIR and NMR spectroscopic methods were utilized to determine the structures of the products in several stages of synthesis. Thermogravimetric analysis demonstrated that CNCs have higher thermal stability than the crude cellulose. FTIR spectroscopy showed successful click reaction between O-propargylcholesterol and CNC. TEM revealed that CNCs were bounded occasionally by cholesterol on its surface. XRD measurements demonstrated lowered crystallinity (85.67%) for the click product.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG006807

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

1 computer optical disc ; 4 3/4 in.

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