Siriphannon, Punnama

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Nanoencapsulation of n-octadecane phase change material in self-assembled polyelectrolyte by soft solution technique
(2014-01-01)
Iamphaojeen, Yuwanda
;
Siriphannon, Punnama
Nanoencapsulation of n-octadecane phase change material was performed by facile soft solution technique. An emulsion of n-octadecane and sodium dodecyl sulfate was prepared by high intensity sonication and then mixed with 1-6 mM of poly(diallyldimethylammonium chloride) (PDDA) solution. The capsules with globular core-shell structure were obtained via self-assembly of PDDA molecules coated on the primary emulsion droplets, described as PDDA encapsulated n-octadecane (PDDA-en-Oc). Average particle size and ζ-potential of PDDA-en-Oc increased with increasing of PDDA concentration due to the different PDDA conformation and thickness of capsules' shell. The smaller diameter of PDDA-en-Oc, the faster heat releasing and absorption were obtained. However, the increasing of PDDA concentration could improve the encapsulation efficiency, resulting in an increment of latent heat quantity. The PDDA-en-Oc capsules prepared from 4 mM PDDA with ∼166 nm in size possessed the maximum latent heat and encapsulation efficiency (i.e., 124.4 J/g and 58%, respectively). © 2014 Copyright Taylor & Francis Group, LLC.
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Immobilization of zinc oxide nanoparticles on cotton fabrics using poly 4-styrenesulfonic acid polyelectrolyte
(2012-05-31)
Iamphaojeen, Yuwanda
;
Siriphannon, Punnama
Immobilization of ZnO nanoparticles on cotton fabrics using poly 4-styrenesulfonic acid (PSS) was studied. The cotton fabrics were firstly cationized using 3-chloro-2-hydroxypropyl trimethylammonium chloride (CHTAC) solution. The surfaces of cationized cotton were coated using a layer-by-layer technique by stepwise dipping the cationized cotton into a solution of anionic PSS polyelectrolyte and Zn(NO <inf>3</inf>) <inf>2</inf> 6H <inf>2</inf>O solution. The coating procedure was repeated 2, 4, and 6 times to obtain the PSS/Zn 2+ multilayers coated on the cotton fabrics. The treated cotton fabrics were hydrothermally treated in NH <inf>4</inf>OH solution at 90°C for 24 h, resulting in immobilization of ZnO nanocrystals on the cotton fabrics. The SEM, XRF, and XPS data revealed the accomplishment of ZnO immobilization on the surfaces of the treated cotton fabrics. The higher the number of PSS/Zn 2+ coating layers on the fabrics, the more hydrothermally grown ZnO nanoparticles could be obtained, resulting in a higher UV protection factor when testing by the AATCC 183-2004 standard test method. All cotton fabrics with the ZnO immobilized on the surfaces were classified according to the AS/NZS 4339:1997 standard in the range of "VERY GOOD" UV protection category. The ZnO-immobilized cotton fabrics with the six PSS/Zn 2+ coating layers could inhibit the growth of Staphylococcus aureus when testing by the AATCC 147-2004 standard test method. © 2012 Carl Hanser Verlag GmbH & Co. KG.
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Polyelectrolyte-Assisted Immobilization of Oil-Based Nanocapsules on Cotton Fabric
(2016-01-01)
Iamphaojeen, Yuwanda
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Manian, Avinash P.
;
Wright, Tom
;
Caven, Barnaby
;
Bechtold, Thomas
Poly(diallyldimethylammonium chloride)-encapsulated n-octadecane nanocapsules (PDDA-Oc-cap) were easily immobilized on cationized cotton at ambient temperature using poly(4-styrenesulfonic acid) (PSS) as a binder. The cationized cotton was first treated with 1-50mM of PSS and then soaked in the PDDA-Oc-cap emulsion in order to obtain stepwise PSS/PDDA-Oc-cap coating layers on the cationized cotton (Cat-cot/PSS/PDDA-Oc-cap). The negative molecules of PSS binder spontaneously attached to the cationized cotton and then acted as negative sites for further immobilization of positively charged PDDA-Oc-cap via electrostatic interaction. Uniform globular particles of PDDA-Oc-cap were observed on the surfaces of Cat-cot/PSS/PDDA-Oc-cap samples in the field-emission scanning electron microscopy images. The positive zeta potential was obtained in the Cat-cot/PSS/PDDA-Oc-cap samples due to the deposition of the positively charged PDDA-Oc-cap on cotton fabric. In addition, the Cat-cot/PSS/PDDA-Oc-cap samples preferentially adsorbed anionic dye eosin B over cationic dye methylene blue. Higher PSS concentrations used in the treatment resulted in higher quantities of PDDA-Oc-cap immobilized on the fabrics, resulting in the concomitant increase of eosin B adsorption. These results suggested that the PSS-assisted immobilization was an efficient alternative method for textile finishing.
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Adjustable thermal barrier of cotton fabric by multilayer immobilization of PCM nanocapsules
(2018-06-01)
Iamphaojeen, Yuwanda
;
Siriphannon, Punnama
Poly(diallyldimethylammonium chloride) encapsulated n-octadecane nanocapsules (Cap+) were facilely immobilized on cationized cotton at ambient temperature by stepwise coating with poly-4-styrenesulfonic acid (PSS) binder and Cap+ nanocapsules via layer-by-layer technique. The negative molecules of PSS binder spontaneously attached on the cationized cotton and then acted as negative sites for further immobilization of positively charged Cap+ nanocapsules through electrostatic interaction. The increase of quantity of immobilized Cap+ nanocapsules could be obtained by increasing the number of PSS/Cap+ treatment cycles. The prolonged duration of thermoregulating action was obtained when increasing the quantity of Cap+ immobilized on the cotton fabric, resulting in the adjustable thermal barrier property of cotton fabric. The cotton sample immobilized with 5 cycles of PSS/Cap+ treatment exhibited the highest reduction of surface temperature, i.e. ~ 2.5 °C for longer than 10 min when the surrounding temperature was about 50 °C. In addition, this sample could retain about 77% of original quantity of immobilized Cap+ after 15 washing cycles. The facile polyelectrolyte assisted nanoencapsulation and immobilization of PCM nanocapsules on the cotton fabrics proposed in this study were effectively performed using low concentrations of non-toxic chemicals, in which they might be incorporated into the conventional fabric finishing system.

Siriphannon, Punnama

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