Abstract
Chitin nanofibers (CNFs) processed from second most abundant biomolecule chitin were loaded with gold metallic nanoparticles (Au NPs) to obtained hybrid organic-inorganic composite which was molded in different forms dispersion, flakes, powder, and transparent thin film. First pre-organized Au NPs were prepared in soluble triblock copolymer poly (methyl vinyl ether) (PMVE) by reduction of gold precursor salt (HAuCl43H2O) by NaBH4 then NPs were mixed with diluted CNFs suspension to obtain CNFs-Au NPs composite. CNFs of width 25 - 40 nm were prepared by combination of chemical and mechanical processing in wet acidic condition from 1 wt% crab shell chitin slurry. When polymer stabilized Au NPs blended with CNF suspension, all Au NPs and 56% polymer were found mass transferred from water phase to entangle with more polar moieties of chitin. Composite’s suspension and compressed dried film were characterized by recording digital images, UV-vis, TEM, SEM, and XRD spectroscopies. When 70 m thin non transparent composite film was impregnated with tricyclodecane dimethanol dimethacrylate (TCDDMA) resin and subsequent polymerized with photoinitiator 2-hydroxy-2-methylpropiophenone, the film became transparent due to filling of nanosized CNFs in the cages of the resin.
Highlights
Chitin nanofibers (CNFs) are extracted from crab and prawn shells [1,2]
Chitin nanofibers (CNFs) processed from second most abundant biomolecule chitin were loaded with gold metallic nanoparticles (Au NPs) to obtained hybrid organic-inorganic composite which was molded in different forms dispersion, flakes, powder, and transparent thin film
Au NPs shed the shell of polymer and get attached to chitin in CNFs and remain in CNFs when filtered on Teflon filter under vacuum, Au NPs and CNFs make thin of CNF-Au NPs composite film
Summary
Chitin nanofibers (CNFs) are extracted from crab and prawn shells [1,2]. CNFs are composed of chitin compound. When blended with inorganic metals to prepare advanced hybrid organic-inorganic [7] composites they can have applications in electronics, electrical, optical de-. In review article [9] molecular structure of chitin, hierarchical organization on the surface of crab shell exoskeleton and isolation from crab and prawn shell has been described. Following text introduces the importance of organic-inorganic hybrid functional materials to justify our research of CNFs-Au NPs composite preparation, characterization, and applications. Funtionalization of Au NPs for sensitive and selective biosensors for detection of targeted of metal ions, organic molecules, proteins, RNA, DNA, other cells having optical, electrical, and electrochemical signals have been demonstrated. Chitin macro-molecule has been selected in the present work to blend with Au NPs since the compound is a natural biocompatible, biodegradable, nontoxic, and bioadsorbable polysaccharide mainly extracted from crab and prawn shells and second most abundant biomolecule after cellulose. The applications of NPs have been widened when they are embedded on CNFs in the field of medicine [22], medical imaging [23], and electrooptical devices [24]
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