Dual-colour generation from layered colloidal photonic crystals harnessing “core hatching” in double emulsions

Abstract

Spontaneous core-hatching process is introduced to double emulsion droplets for implementing further structural tunability and optical responsiveness in colloidal photonic crystals.

Recent advances in the microfluidic production of functional microcapsules by multiple-emulsion templating

“…13a–c. 129 Each photonic microparticle had hexagonal arrays of PS particles along its spherical surface, which rendered the microparticles optically isotropic. Specifically, the microparticles showed a consistent color regardless of the degree of rotation.…”

Designing photonic microparticles with droplet microfluidics

“…The colloidal crystals can be hatched out to form stable photonic microbeads by rupturing the oil shell. 75 Colloidal particles with a strong repulsive potential produce non-close-packed crystalline arrays even at low volume fractions. Therefore, the crystalline arrays have sufficient fluidity so they can be directly injected into microfluidic devices.…”

“…The colloidal crystals can be hatched out to form stable photonic microbeads by rupturing the oil shell. 75…”

Microfluidics-Assisted Fabrication of Dual Stopband Photonic Microcapsules and Their Applications for Anticounterfeiting

“…In addition to structural regulation (imparting the resulting photonic micro-objects with multi-functionalities), the responsiveness to external stimuli is an essential feature for micro-objects [ 29 , 30 ]. Either the colloidal particle building blocks or the matrix materials used for immobilizing the colloids need to be rendered with stimulus-responsive properties [ 31 , 32 , 33 , 34 , 35 ]. Generally, nondeformable nanoparticles, such as PS, SiO 2 , and magnetic NPs, have been used as building blocks for photonic structures.…”