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Adjustable colorimetric moisture indicators

A humidity and indication technology, applied in the direction of humidity indication, meteorology, scientific instruments, etc., can solve the problems of difficult detection of color change of moisture indication, limitation of indicator application, no strong absorption, etc.

Inactive Publication Date: 2015-07-15
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other compositions such as gel carriers containing iron(II), iron(III) or copper chloride salts have been used as moisture indicators, but these indicators do not absorb strongly in the visible electromagnetic spectrum and the moisture indicating color Changes are often difficult to detect
[0003] Additionally, many colorimetric moisture indicators exhibit moisture-sensitive color changes at only one or two specific moisture levels, limiting the applications of each indicator

Method used

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

Examples

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Embodiment 1

[0069] Embodiment 1 is a colorimetric moisture indicating composition, the colorimetric moisture indicating composition comprises a modified moisture indicating composition, the modified moisture indicating composition comprises: (a) a moisture indicating combination A moisture indicating composition comprising (1) a solid support and (2) a bis(glyoxime)-transition metal complex bound to the solid support; and (b) a modification comprising at least one hygroscopic salt wherein the at least one hygroscopic salt comprises an anion selected from the group comprising halides, nitrates, acetates, carbonates and hydroxides; wherein the at least one hygroscopic salt comprises a cation selected from the group comprising ammonium, alkali metals, alkaline earth metals, and transition metals; and wherein the modifier is in physical contact or fluid communication with the moisture indicating composition.

Embodiment 2

[0070] Embodiment 2 is the colorimetric moisture indicating composition of embodiment 1, wherein the at least one hygroscopic salt comprises at least one of the following: lithium bromide, lithium chloride, magnesium chloride, magnesium nitrate, sodium chloride , sodium bromide, potassium acetate, zinc bromide, cesium fluoride, zinc chloride, sodium iodide, potassium fluoride, lithium iodide, calcium bromide, sodium hydroxide, potassium hydroxide.

Embodiment 3

[0071] Embodiment 3 is the colorimetric moisture indicating composition of any one of the preceding embodiments, wherein the at least one hygroscopic salt has a critical relative humidity in the range of about 3% to about 80% relative humidity at 25°C.

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Abstract

Colorimetric moisture-indicating compositions comprising a modified moisture-indicating composition comprising (a) a moisture-indicating composition comprising (1) a solid support and (2) a bis(glyoxime)-transition metal complex bound to the solid support, and (b) a modifier comprising at least one hygroscopic salt are described. In some embodiments, the at least one hygroscopic salt is in physical contact with or in fluid communication with the moisture-indicating composition and comprises an anion the group comprising halide, nitrate, acetate, carbonate, and hydroxide; and a cation selected from the group comprising ammonium, an alkali metal, an alkaline earth metal, and a transition metal. These colorimetric moisture-indicating compositions can be used to make a colorimetric relative humidity-indicating sensor. A method of adjusting the colorimetric response of a colorimetric moisture-indicating composition and a method of detecting moisture are also provided. Colorimetric moisture indicating cards comprising the colorimetric moisture-indicating compositions are also provided.

Description

technical field [0001] The present disclosure relates to a colorimetric moisture indicator comprising a moisture indicating composition comprising a bis(glyoxime)-transition metal complex bound to a solid support by adding Modified by hygroscopic salts. The present disclosure also includes an indicator card comprising a moisture indicating composition comprising a bis(glyoxime)-transition metal complex bound to a solid support by adding a hygroscopic salt And modified. 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 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...

Claims

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Application Information

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IPC IPC(8): G01W1/11G01N31/22G01N21/78
CPCG01N31/22G01W1/11G01N21/81G01N31/222
Inventor E·K·L·Y·哈吉梅姜明灿
Owner 3M INNOVATIVE PROPERTIES CO
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