Council of Scientific and Industrial Research

Government of India

Council of Scientific and Industrial Research and Department of

Subhas Chandra

Sundeep Kumar Dhawan

Ramesh Chandra

Sukhwant Singh Bawa

Ramadhar Singh

Ashok Manikrao Biradar

Hawa Singh

Amarjeet Kaur Narula

Shobha Broor

Ereuvassi P Haridas

Saraswati Koul

The invention relates to a method for the preparation of a polymer coated long duration optical memory device having applications in ferroelectric liquid crystal materials, the said method comprising the steps of forming patterns of different shapes and configurations on a glass substrate coated with indium tin oxide by lithographic methods to obtain an effective electrode area of at least 5 mm ; depositing an antireflection coating on external surfaces of glass substrates followed by coating the patterned glass substrate with a polymer selected from the polyamide group of nylon 6/6 and nylon 6/9 in the thickness range of 900 &angst;-1100 &angst;; baking the coated substrate followed by hard rubbing of the polymer coated surface; coating one of the substrates with a spacer selected from photoresist having thickness in the range of 1 &mgr;m to 3 &mgr;m; inserting a ferroelectric liquid crystal material in the space between the coated glass substrates, followed by sealing the sandwiched glass substrates at the periphery; heating and cooling the sandwiched glass substrates; fixing a polariser and an analyser on non conducting surface of each of the respective glass plates, followed by application of electric field across the sandwiched substrates for achieving the stable memory action, by applying an AC and DC field across the device to obtain an optical memory device having a long duration of memory at least one year.

Polymer coated long duration optical memory device and a method for the development thereof

This invention relates to sulphonated polyaniline as water soluble polymer useful for corrosion inhibition and process for the preparation of said polymer. A preferred sulphonated polyaniline is shown in the formula below

Compensated sulphonated polyaniline and a process for the preparation thereof

As per the World Health organization (WHO) requirement, the water for drinking purposes should be 100% virus free. This invention reports a polymer impregnated porous substrate membrane and method for the preparation of said membrane for capturing viruses from water. The water filtered through the membrane prepared by the process of the present invention has been tested to be virus free and fully potable based on the tests carried out at the Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India and Sriram Institute for Industrial Research (an ISO 9001 R&D Organization), New Delhi, India. The invention will be of immense use especially for the developing countries and third world countries which are subjected to the problem of unsafe drinking water. This invention is useful also for the developed countries for use in water treatment plants due to highly industrialized nature and existence of a variety of manufacturing units like chemicals and fertilizers.

Conducting polymer membrane and a process for the preparation of the

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New Delhi, India

Subhas Chandra