Hydrogel microcapsules with photocatalytic nanoparticles for removal of organic pollutants

Abstract

Droplet-based microfluidics is used to fabricate hydrogel microcapsules with water permeable shells and aqueous core containing encapsulated photocatalytic nanoparticles for the removal of methylene blue from aqueous solutions.

Requirement and Development of Hydrogel Micromotors towards Biomedical Applications

“…Except for its tubular shape, the microfluidic technique can also help to produce thin shell microcapsules with hydrogel shells, and its aqueous core can contain drugs or cells as a cargo. As shown in Figure 1(a), hydrogel microcapsules are fabricated using complex water-in-oil-in-water double emulsion drops generated by the glass capillary-based microfluidics [42]. Thin shell hydrogels with aqueous cores enable faster diffusion of molecular species (e.g., ZnO or TiO 2 nanoparticles in Figure 1(a)II and III) in comparison to bulk hydrogels [42].…”

“…As shown in Figure 1(a), hydrogel microcapsules are fabricated using complex water-in-oil-in-water double emulsion drops generated by the glass capillary-based microfluidics [42]. Thin shell hydrogels with aqueous cores enable faster diffusion of molecular species (e.g., ZnO or TiO 2 nanoparticles in Figure 1(a)II and III) in comparison to bulk hydrogels [42]. Microfluidics is applied to fabricate microcapsule-based hydrogel micromotors (Figure 1(b)) [43].…”

“…Reproduced with permission from ref. [ 42 ], RSC 2020. (b) Hydrogel micromotors are fabricated using glass capillary-based microfluidics.…”

“…Schematic illustration (I) and optical images of ZnO nanoparticles (II) and TiO 2 nanoparticles (III) inside the capsule. Reproduced with permission from ref [42],. RSC 2020.…”

Parameters Optimization of Catalytic Tubular Nanomembrane-Based Oxygen Microbubble Generator

“…Catalytic nanomaterials that do not require wires and external energy sources to generate oxygen from sustainable reactions like decomposition of hydrogen peroxide are highly desirable and in high demand for multiple applications. The dynamic motion of catalytic nano/-microparticle-based motors have been widely investigated for their potential applications including environmental remediation [ 2 , 3 , 4 , 5 ], water cleaning [ 6 , 7 ], bio-sensing in motion [ 8 , 9 , 10 ], minimally invasive surgery, delivery of drugs [ 11 , 12 , 13 , 14 , 15 ], multiplexed immunoassays [ 16 ] and radioactive uranium preconcentration [ 17 ], to name a few examples. Several motive mechanisms have been discovered for micromotors such as self-electrophoresis, self-diffusiophoresis, dynamic surface tension and bubble recoil [ 3 ].…”