Cellulose-Based Microparticles for Magnetically Controlled Optical Modulation and Sensing
| Autor: | Rafael Libanori, Simone Schuerle, Michael K. Hausmann, Signe Lin Kuei Vehusheia, Tanja Zimmermann, Alina Hauser, André R. Studart, Gilberto Siqueira |
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| Rok vydání: | 2019 |
| Předmět: |
Microrheology
Materials science Microfluidics Physics::Optics 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Biomaterials Physics::Fluid Dynamics Optical microscope law Electric field General Materials Science Anisotropy Birefringence business.industry General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Magnetic field Coupling (electronics) Cellulose nanocrystals Magneto-optical properties Microparticles Polarized light Optoelectronics 0210 nano-technology business Biotechnology |
| Zdroj: | Small, 16 (1) |
| ISSN: | 1613-6829 1613-6810 |
| Popis: | Responsive materials with birefringent optical properties have been exploited for the manipulation of light in several modern electronic devices. While electrical fields are often utilized to achieve optical modulation, magnetic stimuli may offer an enticing complementary approach for controlling and manipulating light remotely. Here, the synthesis and characterization of magnetically responsive birefringent microparticles with unusual magneto‐optical properties are reported. These functional microparticles are prepared via a microfluidic emulsification process, in which water‐based droplets are generated in a flow‐focusing device and stretched into anisotropic shapes before conversion into particles via photopolymerization. Birefringence properties are achieved by aligning cellulose nanocrystals within the microparticles during droplet stretching, whereas magnetic responsiveness results from the addition of superparamagnetic nanoparticles to the initial droplet template. When suspended in a fluid, the microparticles can be controllably manipulated via an external magnetic field to result in unique magneto‐optical coupling effects. Using a remotely actuated magnetic field coupled to a polarized optical microscope, these microparticles can be employed to convert magnetic into optical signals or to estimate the viscosity of the suspending fluid through magnetically driven microrheology. ISSN:1613-6810 ISSN:1613-6829 |
| Databáze: | OpenAIRE |
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