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Indicators

Indicators

Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...

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Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...

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A 3D-printed Chamber for Organic Optoelectronic Device Degradation Testing

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An Edible Humidity Indicator That Responds to Changes in Humidity Mechanically.

Mengmeng Zhang¹, Abinaya Arunachalam^1,2, Hugo Perrin¹

¹Process & Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands.

ACS Applied Polymer Materials

|July 20, 2023

Summary

This summary is machine-generated.

This study introduces a novel food-grade humidity indicator that irreversibly bends and rolls when exposed to high humidity. This innovative sensor offers a safe, direct method for monitoring moisture in sensitive products.

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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

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Published on: November 15, 2016

Area of Science:

Materials Science
Food Science
Polymer Science

Background:

Elevated humidity negatively impacts medical, food, and pharmaceutical products, leading to reduced shelf life and spoilage.
Current humidity monitoring solutions are often inedible or pose contamination risks.

Purpose of the Study:

To develop a novel, food-grade humidity indicator.
To investigate the mechanism behind humidity-induced mechanical deformation.
To demonstrate tunable properties for practical applications.

Main Methods:

Fabrication of a bilayer indicator using casein and glycerol polymer films.
Thermogravimetric analysis and microstructural characterization.
Mechanical testing and geometric dimension analysis.

Main Results:

The indicator irreversibly bends and rolls upon exposure to high humidity.
The mechanism involves hygroscopic swelling and counter diffusion of water and glycerol.
Indicator's response time and curvature are tunable via geometric design.

Conclusions:

A novel, food-grade, self-rolling humidity indicator has been developed.
The indicator is safe for direct contact with food and pharmaceuticals.
This technology offers a promising alternative to current inedible sensors for moisture monitoring.