Adjustable colorimetric moisture indicators

An indication and sensor technology, applied in the field of colorimetric moisture indicators, which can solve problems such as instability

Inactive Publication Date: 2015-07-22
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, some compositions containing inorganic salts are inherently unstable to contact with liquid water, since the salts would be easily transported out of the system

Method used

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  • Adjustable colorimetric moisture indicators
  • Adjustable colorimetric moisture indicators
  • Adjustable colorimetric moisture indicators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Embodiment 1 is a composition comprising a solid metal oxide support having surface hydroxyl groups, a silyl-containing compound bonded to the solid metal oxide support through silanol bonds to the surface hydroxyl groups, and Bis(glyoxime)-transition metal complex bound to a solid metal oxide support.

Embodiment 2

[0085] Embodiment 2 is the composition of embodiment 1, wherein the silyl-containing compound is of formula (I)

[0086] R 1 -Si(R 2 ) 3-x (R 3 ) x

[0087] (I)

[0088] in

[0089] R 1 is an alkyl group, a fluoroalkyl group, an alkyl group substituted by an amino group, an aryl group, an aralkyl group or an alkaryl group;

[0090] each R 2 are independently hydroxyl or hydrolyzable groups;

[0091] each R 3 are independently non-hydrolyzable groups; and

[0092] x is an integer equal to 0, 1 or 2.

Embodiment 3

[0093] Embodiment 3 is the composition of embodiment 1, wherein the silyl-containing compound is of formula (II)

[0094] (R 3 ) x (R 2 ) 3-x Si-R 4 -Si(R 2 ) 3-x (R 3 ) x

[0095] (II)

[0096] in

[0097] R 4 is an alkylene group, an arylene group or a combination thereof;

[0098] each R 2 are independently hydroxyl or hydrolyzable groups;

[0099] each R 3 are independently non-hydrolyzable groups; and

[0100] x is an integer equal to 0, 1 or 2.

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Abstract

Compositions are provided comprising: 1) a solid metal oxide support having surface hydroxyl groups; 2) a silyl-containing compound bound to the solid metal oxide support through a silanol bond with the surface hydroxyl groups; and 3) a bis(glyoxime)-transition metal complex bound to the solid metal oxide support. These compositions can be used to make a colorimetric relative humidity-indicating sensor. A method of adjusting the colorimetric response of a moisture-indicating composition and a method of detecting moisture are also provided.

Description

technical field [0001] The present disclosure relates to colorimetric moisture indicators comprising a bis(glyoxime)-transition metal complex bonded to a silane-modified solid metal oxide support. The present disclosure also includes a method of adjusting the colorimetric response of a moisture indicator based on a bis(glyoxime)-transition metal complex bound to a solid metal oxide support. Background technique [0002] Moisture indicators are used, for example, to determine the amount of moisture or humidity in the vicinity of the indicator. The colorimetric indicator changes color when exposed to moisture or humidity. Current commercial colorimetric moisture indicators are based on cobalt-containing compounds such as CoCl 2 ). Due to the potential adverse environmental impact and cost of cobalt, alternatives to cobalt compounds are currently being sought. Other compositions such as gel carriers containing iron(II), iron(III) or copper chloride salts have been used as m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/11G01N31/22G01N21/78
CPCG01N21/81G01N31/222B01J20/08B01J20/103B01J20/223B01J20/28016B01J20/28057B01J20/3204B01J20/3236B01J20/3248B01J2220/49G01N2021/7793
Inventor 姜明灿E·K·L·Y·哈吉梅
Owner 3M INNOVATIVE PROPERTIES CO
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