A soft chemical route is described for the preparation of platinum nanorods and self-assemblies over photochemically reduced polyoxometalate (silicotungstate) containing composite films. Transmission electron microscopy shows that the diameters of the platinum nanorods are around 55-60 nm. The formation of platinum nanorods on solid-liquid interface reactions was explained on the basis of single site growth mechanism and diffusion limitation aggregation process. © Indian Academy of Sciences.

Balasubramanian Viswanathan

Thirukkallam Kanthadai Varadarajan

DIFFUSION LIMITATION AGGREGATION

PLATINUM NANORODS

POLYOXOMETALATE

Diffusion

Nanostructured materials

Self assembly

Sol-gels

Platinum

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Polyoxometalate based soft chemical route for preparation of Pt nanorods and self-assemblies

Bulletin of Materials Science

The esterification of triethylene glycol (TEG) with methacrylic acid (MAA) was carried out over various solid acid catalysts and the results were compared with conventional acid catalysts. Among the catalysts studied, heteropolyacids showed higher activities than the conventional acids. These were attributed to the acidity of the catalysts. A systematic investigation was carried out for the esterification of triethylene glycol with methacrylic acid over phosphotungstic acid without any free radical inhibitor. The effects of catalyst concentration, alcohol/acid molar ratio and temperature were also studied. Parameters such as activation energy, reaction enthalpy and reaction entropy were derived for the above reaction over phosphotungstic acid in the temperature range of 353-383 K. The obtained results were also compared with silicotungstic acid. The esterification of triethylene glycol (TEG) with methacrylic acid (MAA) was carried out over various solid acid catalysts and the results are compared with that of conventional acid catalysts. Among the catalysts studied, heteropolyacids showed higher activities than the conventional acids. Parameters such as activation energy, reaction enthalpy and reaction entropy were derived for this reaction over phosphotungstic acid in the temperature range of 353-383 K. © 2004 Elsevier B.V. All rights reserved.

Journal of Molecular Catalysis A: Chemical

Esterification by solid acid catalysts - A comparison

Journal of the American Chemical Society

Keggin Ions as UV-Switchable Reducing Agents in the Synthesis of Au Core−Ag Shell Nanoparticles

Chemistry of Materials

Deposition of Gold Nanoparticles on Silica Spheres:  A Sonochemical Approach

The Journal of Physical Chemistry B

Photophysical, Photochemical and Photocatalytic Aspects of Metal Nanoparticles

Angewandte Chemie International Edition

Synthesis of Metal Nanoparticles by Using Polyoxometalates as Photocatalysts and Stabilizers We thank the Ministry of Development, General Secretariat of Research and Technology of Greece, for supporting part of this work. We also thank Dr. A. Travlos for help with the TEM images.

Advanced Materials

Nanowire Arrays Electrodeposited from Liquid Crystalline Phases

Journal	Bulletin of Materials Science
ISSN	02504707
Open Access	Yes