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Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
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Tracking Water Transport with Short-Wave Infrared: Kinetic Phase Diagrams, Dissolution, and Drying.

Parth Kelkar1, Marco Caggioni2, Kendra A Erk1

  • 1School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 4, 2025
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Summary
This summary is machine-generated.

Short-wave infrared (SWIR) imaging reveals water transport in soft materials. This technique offers new insights into dissolution, phase transitions, and drying kinetics for improved product quality control.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Imaging Technology

Background:

  • Short-wave infrared (SWIR) imaging is underutilized in soft material and consumer product analysis.
  • Water absorption in SWIR (∼1450 nm) provides contrast for moisture-rich materials.
  • Existing methods lack detailed insights into dynamic water transport in complex formulations.

Purpose of the Study:

  • To demonstrate the capabilities of SWIR imaging for tracking water transport in soft materials.
  • To analyze dissolution dynamics, phase transitions, and drying kinetics.
  • To explore applications in consumer product development and quality control.

Main Methods:

  • Utilized SWIR imaging to monitor water transport in various soft material systems.
  • Combined SWIR with cross-polarized optical imaging for phase transition analysis.
  • Investigated dissolution dynamics, micellar to hexagonal phase transitions, and drying kinetics of polymer and surfactant solutions.

Main Results:

  • Successfully tracked dynamic phase evolution in nonionic surfactant solutions (C12E6).
  • Quantified the influence of salt (NaCl) on the dissolution of concentrated surfactant pastes (SLE1S).
  • Developed an equation for estimating radial dissolution coefficients and correlated solution viscosity with drying time.

Conclusions:

  • SWIR imaging provides unprecedented insights into surfactant hydration and water transport.
  • The technique is a promising tool for real-time monitoring of soft material behavior.
  • SWIR imaging can enhance quality control and product stability analysis in the consumer product industry.