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Ultrasonic standing waves (USSW) create stable oleogel structures by organizing microcrystals into dense bands. This novel method enhances oleogel stability and could benefit various industries needing controlled crystallization.

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Area of Science:

  • Materials Science
  • Food Science
  • Physical Chemistry

Background:

  • Oleogels are oil-based materials (>85% oil) designed as healthier fat alternatives.
  • Current oleogels often lack storage stability due to difficulties in controlling crystalline networks.
  • Improving oleogel stability is crucial for their application as saturated and hydrogenated fat substitutes.

Purpose of the Study:

  • To investigate the use of ultrasonic standing wave (USSW) fields for modifying oleogel structure and enhancing stability.
  • To explore the formation of microcrystal organization within oleogels under USSW influence.
  • To assess the impact of USSW-treated oleogels on the migration of liposoluble substances.

Main Methods:

  • Oleogels were subjected to ultrasonic standing wave (USSW) fields during the crystallization process.
  • The movement and aggregation of growing crystals towards nodal planes were observed.
  • The structure, band thickness, and barrier properties of USSW-modified oleogels were analyzed.
  • Liposoluble colorant migration was compared between USSW-treated and statically crystallized oleogels.

Main Results:

  • USSW fields induced the formation of homogeneous, dense bands of microcrystals.
  • Crystal band formation was independent of oleogelator type, concentration, and cooling rate.
  • The thickness of the microcrystal bands was directly proportional to the USSW wavelength.
  • USSW-modified oleogels exhibited reduced migration kinetics of a liposoluble colorant compared to controls.

Conclusions:

  • USSW fields offer a novel method for precise control over oleogel crystalline network formation.
  • The resulting microcrystal bands act as effective physical barriers, improving oleogel stability.
  • This technology has broad applicability beyond oleogels, benefiting industries requiring controlled crystallization processes.