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Externally triggered dual function of complex microcapsules.

Qiangying Yi1, Gleb B Sukhorukov

  • 1School of Engineering and Materials Science, Queen Mary, University of London , Mile End Road, London, E1 4NS United Kingdom.

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Summary
This summary is machine-generated.

This study presents dual UV-responsive microcapsules that can encapsulate cargo rapidly and release it gradually upon UV light exposure. These smart capsules offer controlled, time-dependent delivery for various applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Layer-by-layer (LbL) fabrication allows for precise control over capsule properties.
  • UV-sensitive materials offer potential for stimuli-responsive systems.
  • Developing multi-functional capsules with distinct responses is a key challenge.

Purpose of the Study:

  • To engineer dual UV-responsive microcapsules with time-dependent encapsulation and release capabilities.
  • To demonstrate selective activation of capsule functions using specific UV wavelengths.
  • To investigate the encapsulation and release of fluorescent polymers as cargo.

Main Methods:

  • Fabrication of dual-functional complex microcapsules using Layer-by-Layer assembly: (PDADMAC/PAZO)4-(DAR/Nafion)2.
  • Incorporation of UV-sensitive diazonium and azobenzene groups into specific capsule layers.
  • Exposure to UV light to trigger photolysis, cross-linking, swelling, and molecular realignment.
  • Encapsulation and release studies using fluorescent polymers as model cargo.

Main Results:

  • UV light induced rapid cross-linking and sealing of capsule shells via diazonium photolysis within minutes.
  • Subsequent gradual swelling and rupture of capsules occurred due to azobenzene molecule realignment under continuous UV irradiation over hours.
  • Successful time-dependent encapsulation and controlled release of fluorescent polymer cargo were achieved.

Conclusions:

  • Dual UV-responsive microcapsules with distinct, time-controlled functions (sealing and release) were successfully fabricated.
  • The proposed system demonstrates selective and sequential activation of functions upon UV light exposure.
  • These advanced microcapsules hold promise for applications requiring precise, time-dependent cargo delivery.