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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Related Experiment Video

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The Synthesis of RGD-functionalized Hydrogels as a Tool for Therapeutic Applications
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Optically Bistable Switching Glazing Achieved by Memory Function of Grafted Hydrogels.

Dowan Kim1, Eunsu Lee2, Jinhwan Yoon1

  • 1Department of Chemistry Education, Graduate Department of Chemical Materials, and Institute for Plastic Information and Energy Materials , Pusan National University , 2 Busandaehak-ro 63 beon-gil , Geumjeong-gu, Busan 46241 , Republic of Korea.

ACS Applied Materials & Interfaces
|June 9, 2018
PubMed
Summary

This study introduces an energy-saving smart window using bistable hydrogels that retain their optical state without continuous power. This novel approach minimizes energy consumption for smart window applications.

Keywords:
optical bistabilitysmooth phase transitionswitchable glazingthermal hysteresisthermotropic hydrogels

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Energy

Background:

  • Active switching glazings require continuous electrical energy for smart window operation.
  • Minimizing energy consumption is crucial for widespread adoption of smart windows.

Purpose of the Study:

  • To develop an energy-efficient optically bistable switching glazing.
  • To leverage the memory function of hydrogels for smart window applications.

Main Methods:

  • Grafting a multicomponent copolymer with a chemical composition gradient onto a methyl cellulose backbone.
  • Utilizing the thermal hysteresis and volume phase transition behavior of the prepared hydrogel.

Main Results:

  • The developed hydrogel exhibits a smooth heating transition and significant thermal hysteresis during cooling.
  • An optically bistable window was successfully prepared, retaining its switched state and allowing stepwise activation via applied current.

Conclusions:

  • The novel bistable hydrogel glazing offers a solution for energy-saving smart windows.
  • This technology enables on-demand solar control and adjustable visibility with minimal energy usage.