Nanoparticle dispersions in carrageenan films

Motivated by the widespread interest in Q-sized semiconductor particles (e.g., CdS, TiO2) and the relatively abundant seaweed resource of the Philippines, we initiated studies of dispersed semiconductor nanoparticles in seaweed biopolymers, particularly, κ-carrageenan and ι-carrageenan. Iota- and κ-...

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Main Authors: Enriquez, Erwin P, Aliganga, Ann A
Format: text
Published: Archīum Ateneo 1998
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Online Access:https://archium.ateneo.edu/chemistry-faculty-pubs/88
https://inis.iaea.org/search/search.aspx?orig_q=RN:30022338
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Institution: Ateneo De Manila University
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spelling ph-ateneo-arc.chemistry-faculty-pubs-10872020-07-14T10:12:23Z Nanoparticle dispersions in carrageenan films Enriquez, Erwin P Aliganga, Ann A Motivated by the widespread interest in Q-sized semiconductor particles (e.g., CdS, TiO2) and the relatively abundant seaweed resource of the Philippines, we initiated studies of dispersed semiconductor nanoparticles in seaweed biopolymers, particularly, κ-carrageenan and ι-carrageenan. Iota- and κ-carrageenan are sulfated galactans with an average of single and double sulfation groups per repeat unit, respectively. Cadmium sulfide was grown in situ on adsorbed, ultrathin films of the polysaccharide by treatment with aqueous CdCl2 followed by exposure to H2S gas. The resulting nanoparticles were studied by following the UV-Vis spectra of the films during exposure to H2S gas. The absorption band edge of the CdS-carrageenan composite was observed to vary from 2.8 eV to 2.6 eV. Based on absorption band edge theory for semiconductor particles, these results are indicative of nano-sized CdS particles raging from 40 angstrom to 60 angstrom diameter. The particle size and film morphology were additionally studied by atomic force microscopy (AFM). AFM images showed various particulate morphologies: from small particles to rod-like of dimensions in the order of 50-100 nm. These images reveal what appear to be templated crystallization of CdS in the biopolymer matrix. 1998-01-01T08:00:00Z text https://archium.ateneo.edu/chemistry-faculty-pubs/88 https://inis.iaea.org/search/search.aspx?orig_q=RN:30022338 Chemistry Faculty Publications Archīum Ateneo ABSORPTION ABSORPTION SPECTROSCOPY AGAR CADMIUM SULFIDES PARTICLES PHILIPPINES POLYMERS SEAWEEDS SUPERCONDUCTING FILMS THIN FILMS Chemistry Environmental Chemistry
institution Ateneo De Manila University
building Ateneo De Manila University Library
continent Asia
country Philippines
Philippines
content_provider Ateneo De Manila University Library
collection archium.Ateneo Institutional Repository
topic ABSORPTION
ABSORPTION SPECTROSCOPY
AGAR
CADMIUM SULFIDES
PARTICLES
PHILIPPINES
POLYMERS
SEAWEEDS
SUPERCONDUCTING FILMS
THIN FILMS
Chemistry
Environmental Chemistry
spellingShingle ABSORPTION
ABSORPTION SPECTROSCOPY
AGAR
CADMIUM SULFIDES
PARTICLES
PHILIPPINES
POLYMERS
SEAWEEDS
SUPERCONDUCTING FILMS
THIN FILMS
Chemistry
Environmental Chemistry
Enriquez, Erwin P
Aliganga, Ann A
Nanoparticle dispersions in carrageenan films
description Motivated by the widespread interest in Q-sized semiconductor particles (e.g., CdS, TiO2) and the relatively abundant seaweed resource of the Philippines, we initiated studies of dispersed semiconductor nanoparticles in seaweed biopolymers, particularly, κ-carrageenan and ι-carrageenan. Iota- and κ-carrageenan are sulfated galactans with an average of single and double sulfation groups per repeat unit, respectively. Cadmium sulfide was grown in situ on adsorbed, ultrathin films of the polysaccharide by treatment with aqueous CdCl2 followed by exposure to H2S gas. The resulting nanoparticles were studied by following the UV-Vis spectra of the films during exposure to H2S gas. The absorption band edge of the CdS-carrageenan composite was observed to vary from 2.8 eV to 2.6 eV. Based on absorption band edge theory for semiconductor particles, these results are indicative of nano-sized CdS particles raging from 40 angstrom to 60 angstrom diameter. The particle size and film morphology were additionally studied by atomic force microscopy (AFM). AFM images showed various particulate morphologies: from small particles to rod-like of dimensions in the order of 50-100 nm. These images reveal what appear to be templated crystallization of CdS in the biopolymer matrix.
format text
author Enriquez, Erwin P
Aliganga, Ann A
author_facet Enriquez, Erwin P
Aliganga, Ann A
author_sort Enriquez, Erwin P
title Nanoparticle dispersions in carrageenan films
title_short Nanoparticle dispersions in carrageenan films
title_full Nanoparticle dispersions in carrageenan films
title_fullStr Nanoparticle dispersions in carrageenan films
title_full_unstemmed Nanoparticle dispersions in carrageenan films
title_sort nanoparticle dispersions in carrageenan films
publisher Archīum Ateneo
publishDate 1998
url https://archium.ateneo.edu/chemistry-faculty-pubs/88
https://inis.iaea.org/search/search.aspx?orig_q=RN:30022338
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