Organogels from Dimeric Bile Acid Esters: In Situ Formation of Gold Nanoparticles

Chakrabarty, Arkajyoti and Maitra, Uday (2013) Organogels from Dimeric Bile Acid Esters: In Situ Formation of Gold Nanoparticles. In: JOURNAL OF PHYSICAL CHEMISTRY B, 117 (26). pp. 8039-8046.

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Abstract

A new class of steroid dimers (bile acid derivatives) linked through ester functionalities were synthesized, which gelled various aromatic solvents. The organogels formed by the three dimeric ester molecules showed birefringent textures and fibrous nature by polarizing optical microscopy and scanning electron microscopy, respectively. A detailed rheological study was performed to estimate the mechanical strengths of two sets of organogels. In these systems, the storage modulus varied in the range of 0.8-3.5 X 10(4) at 1% w/v of the organogelators. The exponents of scaling of the storage modulus and yield stress of the two systems agreed well with those expected for viscoelastic soft colloidal gels with fibrillar flocs. The nanofibers in the organogel were utilized to engineer gold nanoparticles of different sizes and shapes and generate new gel-nanoparticle hybrid materials.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY B
Publisher:	AMER CHEMICAL SOC
Additional Information:	Copyright of this article belongs to AMER CHEMICAL SOC
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	04 Sep 2013 06:28
Last Modified:	04 Sep 2013 06:28
URI:	http://eprints.iisc.ac.in/id/eprint/47042

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