Silver Nanoparticle Synthesis: Novel Route for Laser Triggering of Polyelectrolyte Capsules

Anandhakumar, S and Vijayalakshmi, SP and Jagadeesh, G and Raichur, Ashok M (2011) Silver Nanoparticle Synthesis: Novel Route for Laser Triggering of Polyelectrolyte Capsules. In: ACS Applied Materials & Interfaces, 3 (9). pp. 3419-3424.

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Abstract

We have demonstrated the synthesis of light-sensitive polyelectrolyte capsules (PECs) by utilizing a novel polyol reduction method and investigated its applicability as photosensitive drug delivery vehicle. The nanostructured capsules were prepared via layer by layer (LbL) assembly of poly(allylamine hydrochloride) (PAN) and dextran sulfate (DS) on silica particles followed by in-situ synthesis of silver nanoparticles (NPs). Capsules without silver NPs were permeable to low molecular weight (A(w), 479 g/mol) rhodamine but impermeable to higher molecular weight fluorescence labeled dextran (FITC-dextran). However, capsules synthesized with silver NPs showed porous morphology and were permeable to higher molecular weight (M(w) 70 kDa) FITC-dextran also. These capsules were loaded with FITC-dextran using thermal encapsulation method by exploiting temperature induced shrinking of the capsules. During heat treatment the porous morphology of the capsules transformed into smooth pore free structure which prevents the movement of dextran into bulk during the loading process. When these loaded capsules are exposed to laser pulses, the capsule wall ruptured, resulting in the release of the loaded drug/dye. The rupture of the capsules was dependent on particle size, laser pulse energy and exposure time. The release was linear with time when pulse energy of 400 mu J was used and burst release was observed when pulse energy increased to 600 mu J.

Item Type:	Journal Article
Publication:	ACS Applied Materials & Interfaces
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Keywords:	silver nanoparticles;polyol reduction;polyelectrolyte capsules;laser triggering;drug delivery
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	07 Dec 2011 06:45
Last Modified:	07 Dec 2011 06:45
URI:	http://eprints.iisc.ac.in/id/eprint/42543

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