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Related Concept Videos

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Use of Microscale Thermophoresis to Measure Protein-Lipid Interactions
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Solution composition dependent Soret coefficient using commercial MicroScale Thermophoresis instrument.

Praneetha Pulyala1, Meng Jing2, Wei Gao2

  • 1Department of Bioengineering, Lehigh University Bethlehem PA 18015 USA xuc207@lehigh.edu.

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|June 1, 2023
PubMed
Summary
This summary is machine-generated.

Particle migration in liquids (thermophoresis) depends on liquid properties. This study quantifies thermophoresis in colloids, revealing its sensitivity to medium composition, pH, and salt concentration, offering new insights into particle behavior in complex systems.

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Area of Science:

  • Colloid and interface science
  • Physical chemistry
  • Materials science

Background:

  • Particle migration in temperature gradients (thermophoresis) is crucial for understanding colloidal behavior.
  • The properties of the dispersing medium significantly influence thermal diffusion.
  • Existing methods for quantifying thermophoresis require further refinement for complex systems.

Purpose of the Study:

  • To develop a method for quantifying particle migration in temperature gradients using MicroScale Thermophoresis (MST).
  • To investigate the influence of dispersing medium composition, pH, anionic surfactant, and salt concentration on thermophoretic behavior.
  • To develop a mathematical model for extracting the Soret coefficient (ST) and understand thermophoretic behavior in complex systems.

Main Methods:

  • Utilized a commercial instrument to induce and measure thermophoresis.
  • Employed MicroScale Thermophoresis (MST) to quantify the thermophoretic migration of carboxylate-modified polystyrene particles in aqueous suspensions.
  • Developed a mathematical model to extract the Soret coefficient (ST) from MST data.

Main Results:

  • Quantified thermophoretic migration of colloids and its dependence on medium composition, pH, and salt concentration.
  • Soret coefficient (ST) measurements correlated with Debye length and surface charge density, influenced by medium composition.
  • Observed that thermophobic/thermophilic behavior is affected by the thermoelectric effect of buffer ions.

Conclusions:

  • The developed method accurately quantifies thermophoresis and provides Soret coefficient (ST) values consistent with theory.
  • Particle thermophoresis is highly sensitive to solvent properties, including ionic strength and composition.
  • Introduced a new analytical model applicable to complex systems for understanding thermophoresis as a function of solvent properties.