Thermochromic composition, method of making, and use

Details Thermochromic composition, method of making, and use Thermochromic composition, method of making, and use

1977-05-06

1979-04-17

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

73356, 116207, 252408, 422 58, 422 60, G01K 1106

Patent

active

041498526

ABSTRACT:
PH indicator composition has controlled change of color at a selected sub-freezing temperature. The composition comprises at least one pH indicator, a buffer solution containing at least one inorganic ion in solution and a control agent or a precursor of a control agent. The buffer solution has a pH capable of changing when the temperature of the buffer solution is lowered to below freezing. The control agent is capable of effecting a change in ionic strength and proton composition of the frozen pH indicator composition to thereby control the temperature at which the color change occurs. A method of using the composition comprises lowering the temperature from a first temperature above freezing to a second temperature at which the pH indicator composition is in a substantially frozen state. The composition is particularly useful in a color change thermometer.

REFERENCES:
patent: 2195395 (1940-04-01), Chapman
patent: 2261473 (1941-11-01), Jennings
patent: 2614430 (1952-10-01), Ballard et al.
patent: 2809116 (1957-10-01), Laskowski et al.
patent: 3935834 (1976-02-01), Buhrmann, Jr.
patent: 3977945 (1976-08-01), Tornmarck
Britton, "Hydrogen Ions Their Determination and Importance in Pure and Industrial Chemistry", D. Van Nostrand, Co., vol. 1, 1943, pp. 383 and 384.

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