Solvent‐Free Synthesis of Microparticles on Superamphiphobic Surfaces

Deng, Xu; Paven, Maxime; Papadopoulos, Periklis; Ye, Ming; Wu, Si; Schuster, Thomas; Klapper, Markus; Vollmer, Doris; Butt, Hans‐Jürgen

doi:10.1002/anie.201302903

Cited by 39 publications

(27 citation statements)

References 38 publications

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“…19 In contrast to conventional optical microscopy, CLSM can resolve details at the three-phase contact line, at the drop-surface contact area and in the interior of the drop. For instance, in a recent work this technique showed that even micrometer-sized drops form high contact angles with a superamphiphobic surface throughout the evaporation process, leading to defect-free spherical particles.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Formation of Anisometric Supraparticles: A Mechanistic Look Inside Droplets Drying on a Superhydrophobic Surface

2016

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Evaporating drops of nanoparticle suspensions on superhydrophobic surfaces can give anisotropic superaparticles. Previous studies implied the formation of a stiff shell that collapses, but the exact mechanism leading to anisotropy was unclear so far. Here we report on a new experiment using confocal laser scanning microscopy for a detailed characterization of particle formation from droplets of aqueous colloidal dispersions on superhydrophobic surfaces. In a customized setup, we investigated droplets of fumed silica suspensions using two different fluorescent dyes for independently marking silica and the water phase. Taking advantage of interfacial reflection, we locate the drop-air interface and extract normalized time-resolved intensity profiles for dyed silica throughout the drying process. Using comprehensive image analysis we observe and quantify shell-like interfacial particle accumulation arising from droplet evaporation. This leads to a buildup of a stiff fumed silica mantle of ∼20 μm thickness that causes deformation of the droplet throughout further shrinkage, consequently leading to the formation of solid anisometric fumed silica particles.

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Section: Introductionmentioning

confidence: 99%

Understanding the Formation of Anisometric Supraparticles: A Mechanistic Look Inside Droplets Drying on a Superhydrophobic Surface

2016

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“…Beyond, LIPSS might be a promising alternative to create antibacterial surfaces [155]. Superamphiphobic surfaces might be of particular interest for applications in microfluidics [156], for the synthesis of polymeric particles [157,158], and for the oxygenation of blood [159]. …”

Section: Future Perspectivesmentioning

confidence: 99%

Bio-Inspired Functional Surfaces Based on Laser-Induced Periodic Surface Structures

2016

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Nature developed numerous solutions to solve various technical problems related to material surfaces by combining the physico-chemical properties of a material with periodically aligned micro/nanostructures in a sophisticated manner. The utilization of ultra-short pulsed lasers allows mimicking numerous of these features by generating laser-induced periodic surface structures (LIPSS). In this review paper, we describe the physical background of LIPSS generation as well as the physical principles of surface related phenomena like wettability, reflectivity, and friction. Then we introduce several biological examples including e.g., lotus leafs, springtails, dessert beetles, moth eyes, butterfly wings, weevils, sharks, pangolins, and snakes to illustrate how nature solves technical problems, and we give a comprehensive overview of recent achievements related to the utilization of LIPSS to generate superhydrophobic, anti-reflective, colored, and drag resistant surfaces. Finally, we conclude with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces.

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“…[1][2][3][4][5][6][7][8][9][10][11][12] In the past two decades, an increasing number of passive and active strategies have been developed to control liquid motion. [1][2][3][4][5][6][7][8][9][10][11][12] In the past two decades, an increasing number of passive and active strategies have been developed to control liquid motion.…”

Section: Introductionmentioning

confidence: 99%

Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

Zhou

Huang

Tian

2019

Adv Funct Materials

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Magnetic actuation provides a remote, nondestructive, and real-time way for controllable liquid manipulation, which has promising technological applications for areas ranging from digital microfluidics, biochemical assays, and microreactors, to liquid collection. However, conventional magnetic liquid manipulation usually relies on incorporating magnetic particles into a liquid to empower its motion in response to an external magnetic field, resulting in considerable limitations of magnetic actuation in various applications. Recently, a range of magnetoresponsive surfaces (MRSs) with elaborately designed surface structures and/or compositions have enabled on-demand liquid manipulation using magnetic fields, even when the liquids do not contain any magnetic particles. Here, the state-of-the-art of MRSs capable of manipulation of nonmagnetic liquids is reviewed. Their preparation, different manipulation modes, including directed propulsion, spreading, and rebound, and the underlying working mechanisms are discussed. Based on the working principles, MRSs are classified into three categories, including surfaces with magnetic bendable microstructures, surfaces with switchable topographies, and surfaces infused with ferrofluids. Their applications in microfluidics, microreactors, liquid distributors and pumps, fog collection, and anti-icing are presented. Finally, key challenges and the future prospects of MRSs are provided.

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Solvent‐Free Synthesis of Microparticles on Superamphiphobic Surfaces

Abstract: Polymeric and composite microspheres can be synthesized without solvents or process liquids by using superamphiphobic surfaces. In this method, the repellency of superamphiphobic layers to monomers and polymer melts and the extremely low adhesion to particles are taken advantage of.

Cited by 39 publications

References 38 publications

Understanding the Formation of Anisometric Supraparticles: A Mechanistic Look Inside Droplets Drying on a Superhydrophobic Surface

Understanding the Formation of Anisometric Supraparticles: A Mechanistic Look Inside Droplets Drying on a Superhydrophobic Surface

Bio-Inspired Functional Surfaces Based on Laser-Induced Periodic Surface Structures

Magnetoresponsive Surfaces for Manipulation of Nonmagnetic Liquids: Design and Applications

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