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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Amphiphilic block copolymers self-assemble into micelles.
  • Shell-crosslinked micelles offer tunable properties for sensing applications.
  • pH-sensitive materials are crucial for biological and environmental monitoring.

Purpose of the Study:

  • To design dual-emitting photonic nano-objects capable of sensing environmental pH changes.
  • To investigate the relationship between nano-object morphology, crosslinking chemistry, and pH-sensitive photophysical properties.
  • To demonstrate fine-tuning of dual-emission over a 60 nm range in a physiologically relevant pH range.

Main Methods:

  • Assembly of shell-crosslinked micelles from amphiphilic block copolymers.
  • Crosslinking using pH-insensitive tetra-functionalized pyrazine chromophores with varying amine groups.
  • Amidation reactions on the poly(acrylic acid) shell domain via activated esters.
  • Characterization of dual-emission photophysical properties as a function of pH and nano-object morphology.

Main Results:

  • Dual-emitting photonic nano-objects exhibiting pH-dependent fluorescence intensity ratios (496 nm/560 nm).
  • Morphology-dependent reactivity of chromophoric crosslinkers leading to tunable hypsochromic shifts.
  • Demonstrated fine-tuning of dual-emission by over 60 nm through physical and chemical manipulations.
  • Rod-shaped and spherical nano-objects showed distinct pH-dependent blue-shift behaviors.

Conclusions:

  • Shell-crosslinked micelles provide a versatile platform for developing pH-sensitive dual-emitting photonic nano-objects.
  • The design allows for precise control over photophysical properties through manipulation of morphology and crosslinking.
  • These nano-objects hold promise for advanced pH sensing technologies in relevant environments.