Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Capacitor With A Dielectric

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...

Moisture Content and Bulking of Aggregate

Moisture Content and Bulking of Aggregate

The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...

Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

Classification and Mechanical Properties of Synthetic Polymers

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...

Waterproofing and Anti-Bacterial Admixtures in Concrete

Waterproofing and Anti-Bacterial Admixtures in Concrete

Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...

Dielectric Polarization in a Capacitor

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

M-M bond-stretching energy landscapes for M2(dimen)4(2+) (M = Rh, Ir; dimen = 1,8-diisocyanomenthane) complexes.

Inorganic chemistry·2012

Same author

Preparation and characterization of asymmetric alpha-alkoxy dipyrrin ligands and their metal complexes.

Dalton transactions (Cambridge, England : 2003)·2007

Same author

Topological control in heterometallic metal-organic frameworks by anion templating and metalloligand design.

Journal of the American Chemical Society·2006

Same author

Self-assembly of heteroleptic [Cu(dipyrrinato)(hfacac)] complexes directed by fluorine-fluorine interactions.

Inorganic chemistry·2005

Same author

Heterometallic metal-organic frameworks based on tris(dipyrrinato) coordination complexes.

Inorganic chemistry·2005

Same author

Electron tunneling through organic molecules in frozen glasses.

Science (New York, N.Y.)·2005

Search research articles

Related Experiment Video

Updated: Jun 14, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

Cobalt-containing polyimides for moisture sensing and absorption.

Sara R Halper¹, Randy M Villahermosa

¹Physical Sciences Laboratories, The Aerospace Corporation, P.O. Box 92957, M2/242, Los Angeles, California 90009-2957, USA. Sara.R.Halper@aero.org

ACS Applied Materials & Interfaces

|April 2, 2010

Summary

A new polyimide material with cobalt(II) chloride can sense and absorb moisture, changing color with humidity. This enhanced polymer shows significantly greater moisture absorption than the original material.

More Related Videos

A Polyaniline-based Sensor of Nucleic Acids

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

Related Experiment Videos

Last Updated: Jun 14, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

A Polyaniline-based Sensor of Nucleic Acids

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

Area of Science:

Polymer Science
Materials Science
Chemical Engineering

Background:

Polyimides are advanced polymers with excellent thermal and mechanical properties.
Developing materials for effective moisture sensing and absorption is crucial for various industrial applications.
Cobalt(II) chloride is a known indicator for moisture due to its color change properties.

Purpose of the Study:

To create a modified polyimide capable of both sensing and absorbing moisture.
To investigate the properties and performance of the modified polyimide for moisture management.
To evaluate the enhanced moisture absorption capacity compared to unmodified polyimide.

Main Methods:

Incorporation of cobalt(II) chloride into a polyimide matrix.
Characterization of the modified polymer for thermal stability and metal retention.
Assessment of moisture absorption using a quartz crystal microbalance.
Evaluation of colorimetric response to varying humidity levels.

Main Results:

The modified polyimide was fully cured, thermally stable, and showed no metal leaching.
The material exhibited a reversible visible color change upon exposure to and drying from moisture.
Moisture absorption was found to be directly proportional to relative humidity.
The modified polymer demonstrated up to three times greater moisture absorption capacity than the unmodified polyimide.

Conclusions:

A novel, stable, and reusable polyimide-based material for moisture sensing and absorption has been successfully developed.
The material's color change provides a visual indication of moisture presence and humidity levels.
The enhanced absorption capacity offers significant advantages for applications requiring effective moisture control.