The pioneer in material science - Uma Chowdhry

Uma Chowdhry – pioneer in material science

Uma Chowdhry - An American Chemist

Biography & contributions

Uma Chowdhry is an American chemist born in 1947. She received a Bachelor's degree in physics from Indian Institute of Science, Mumbai University in 1968. She studied initially on Tetrahydrofuran solvent, Ceramic material like porcelain, Catalysis process, Superconductors.

Uma Chowdhry served as lab director and business manager in the Electronics Department from 1988 to 1992, In 1996 she was elected to the National Academy of Engineering, in the year 2002 Chowdhry was appointed director of DuPont Engineering Technology, in the year 2003 she was elected to the American Academy of Arts and Sciences.

Facts about tetrahydrofuran

  • Tetrahydrofuran (THF) solvent is an inert, versatile solvent.
  • The two largest global producers of THF are BASF and Dairen Chemical Corporation, combining for 54% of world capacity as of early 2013.
  • Global THF capacity is expected to increase by more than 40% by 2017.
  • Tetrahydrofuran is often used in polymer science.
  • Tetrahydrofuran is used as a component in mobile phases for reversed-phase liquid chromatography.

Production process

Method I:

1] Acid-catalyzed dehydration of 1,4-butanediol

2] The butanediol is derived from condensation of acetylene with formaldehyde followed by hydrogenation.

Method II:

Oxidizing n-butane to crude maleic anhydride followed by catalytic hydrogenation

Method III:

Hydroformylation of allyl alcohol followed by hydrogenation to the butanediol.

Facts about porcelain

Porcelain is a ceramic material made by heating materials

The inert, impermeable qualities of glass make a porcelain enamel coating a good electrical insulator.

Both electrical resistance and electrical conductivity may be achieved in porcelain enamel coating systems. The electrical resistance per unit area is a function of the thickness and the composition of the porcelain enamel

Dielectric strength of ordinary porcelain enamels will range from 200 to 500 volts per mil with an average of 4 to 6 mils total thickness.

Volume resistivity of porcelain varies from 10.13 to 10.16 ohm-cm at room temperature.

Properties of Porcelain Insulator

Property Value (Approximate)
Dielectric Strength 60 KV / cm
Compressive Strength 70,000 Kg / cm2
Tensile Strength 500 Kg / cm2

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