Magnetically responsive colloidal crystals with angle-independent gradient structural colors in microfluidic droplet arrays.

Magnetically responsive colloidal crystal films with gradient structural colors have a significant value in optical applications via controllable external stimuli. Herein, we propose a practical method for fabricating colloidal crystal hydrogel films with continuous gradient structural colors by using superparamagnetic colloidal nanoparticles. The colloidal nanoparticles could self-assemble into chain-like non-close-packed arrays to present structural colors under the stimuli of external magnetic fields. And structural colors with gradient changes could be achieved when subjected to a spatial magnetic field with a remarkable variation in field strength and direction. By integrating with a microfluidic droplet array template with spherical symmetry morphology, we have demonstrated convenient fabrication of free-standing colloidal crystal films with angle-independent gradient structural colors, which could be utilized for the fabrication of optical devices.

[1]  Ke Xu,et al.  Correction: Bio-inspired intelligent structural color materials , 2019, Materials Horizons.

[2]  Zhengdong Cheng,et al.  Non-iridescent, crack-free, conductive structural colors enhanced by flexible nanosheets of reduced graphene oxide , 2019, Dyes and Pigments.

[3]  Jung Min Lee,et al.  Designing Structural-Color Patterns Composed of Colloidal Arrays. , 2019, ACS applied materials & interfaces.

[4]  Shin‐Hyun Kim,et al.  Photonic Microcapsules Containing Single‐Crystal Colloidal Arrays with Optical Anisotropy , 2019, Advanced materials.

[5]  Xianming Deng,et al.  Close-loop dynamic nanohybrids on collagen-ark with in situ gelling transformation capability for biomimetic stage-specific diabetic wound healing , 2019, Materials Horizons.

[6]  Yuanjin Zhao,et al.  Design of capillary microfluidics for spinning cell-laden microfibers , 2018, Nature Protocols.

[7]  Luoran Shang,et al.  Multicolored photonic barcodes from dynamic micromolding , 2018 .

[8]  Ho Cheung Shum,et al.  Generation of High-Order All-Aqueous Emulsion Drops by Osmosis-Driven Phase Separation. , 2018, Small.

[9]  Yuanjin Zhao,et al.  Biomimetic enzyme cascade reaction system in microfluidic electrospray microcapsules , 2018, Science Advances.

[10]  H. Pei,et al.  Programmable and Multifunctional DNA‐Based Materials for Biomedical Applications , 2018, Advanced materials.

[11]  Zhengdong Cheng,et al.  Chiral Photonic Crystalline Microcapsules with Strict Monodispersity, Ultrahigh Thermal Stability, and Reversible Response. , 2018, ACS applied materials & interfaces.

[12]  Yuanjin Zhao,et al.  Responsive graphene oxide hydrogel microcarriers for controllable cell capture and release , 2018, Science China Materials.

[13]  Luoran Shang,et al.  Bioinspired living structural color hydrogels , 2018, Science Robotics.

[14]  Mingzhu Li,et al.  Patterned Colloidal Photonic Crystals. , 2018, Angewandte Chemie.

[15]  Quan Zhou,et al.  Manipulating Superparamagnetic Microparticles with an Electromagnetic Needle , 2018 .

[16]  Jung Min Lee,et al.  Chameleon-Inspired Mechanochromic Photonic Films Composed of Non-Close-Packed Colloidal Arrays. , 2017, ACS nano.

[17]  Yitong Jiang,et al.  A dual-channel optical magnetometer based on magnetically responsive inverse opal microspheres , 2017 .

[18]  Yuanjin Zhao,et al.  Microfluidic generation of egg-derived protein microcarriers for 3D cell culture and drug delivery. , 2017, Science bulletin.

[19]  Micah J. Green,et al.  Aqueous Exfoliation of Graphite into Graphene Assisted by Sulfonyl Graphene Quantum Dots for Photonic Crystal Applications. , 2017, ACS applied materials & interfaces.

[20]  Yuanjin Zhao,et al.  Emerging Droplet Microfluidics. , 2017, Chemical reviews.

[21]  Zhongze Gu,et al.  Bio-inspired self-healing structural color hydrogel , 2017, Proceedings of the National Academy of Sciences.

[22]  Zhongze Gu,et al.  Tunable Structural Color Surfaces with Visually Self‐Reporting Wettability , 2016 .

[23]  Bin Su,et al.  Four-Dimensional Screening Anti-Counterfeiting Pattern by Inkjet Printed Photonic Crystals. , 2016, Chemistry, an Asian journal.

[24]  Yuanjin Zhao,et al.  Free-Standing Photonic Crystal Films with Gradient Structural Colors. , 2016, ACS applied materials & interfaces.

[25]  Yang Song,et al.  All-Aqueous Electrosprayed Emulsion for Templated Fabrication of Cytocompatible Microcapsules. , 2015, ACS applied materials & interfaces.

[26]  J. Ge,et al.  Photonic sensing of organic solvents through geometric study of dynamic reflection spectrum , 2015, Nature Communications.

[27]  Yanlin Song,et al.  Hydrophilic-Hydrophobic Patterned Molecularly Imprinted Photonic Crystal Sensors for High-Sensitive Colorimetric Detection of Tetracycline. , 2015, Small.

[28]  Lei Shi,et al.  Amorphous Photonic Crystals with Only Short‐Range Order , 2013, Advanced materials.

[29]  Jing Liu,et al.  Electric field tuning of magnetically assembled photonic crystals , 2013 .

[30]  Baoping Wang,et al.  Tailoring colloidal photonic crystals with wide viewing angles. , 2013, Small.

[31]  Yadong Yin,et al.  Responsive photonic crystals. , 2011, Angewandte Chemie.

[32]  P. Russell,et al.  Photonic Crystal Fibers , 2003, Science.

[33]  J. Joannopoulos,et al.  Photonic crystals: putting a new twist on light , 1997, Nature.