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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
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pH- and temperature-responsive supramolecular assemblies with highly adjustable viscoelasticity: a multi-stimuli

Yu-Ting Lin1, Shuhao Liu1, Bhargavi Bhat1

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This study introduces a novel pH- and temperature-responsive material with tunable viscosity. This stimuli-responsive system offers significant control over fluid properties for advanced applications.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Rheology

Background:

  • Stimuli-responsive materials are crucial for developing adaptable electronic, mechanical, and biological systems.
  • Controlling material properties like viscosity and viscoelasticity is essential for smart device functionality.

Purpose of the Study:

  • To report a novel pH- and temperature-responsive binary supramolecular assembly.
  • To investigate the tunable viscous and viscoelastic properties of this assembly.
  • To understand the underlying mechanisms of property control.

Main Methods:

  • Utilized a binary supramolecular assembly of a long-chain hydroxyamino amide (HAA) and boric acid.
  • Investigated rheological properties (viscosity, viscoelasticity) under varying pH and temperature conditions.
  • Employed cryo-transmission electron microscopy (cryo-TEM) to study morphological transformations.

Main Results:

  • Achieved over four orders of magnitude of viscosity control by manipulating pH and temperature.
  • Demonstrated the ability to switch fluid behavior from non-Maxwellian to Maxwellian.
  • Observed morphological transformations (spherical vesicles, aggregated vesicles, gyroid structures) correlated with rheological changes.

Conclusions:

  • The binary supramolecular assembly exhibits significant pH- and temperature-responsiveness.
  • Rheological properties are switchable due to pH-induced modulation of HAA head group spacing and boric acid intercalation.
  • This system offers a high degree of control for stimuli-responsive material applications.