Synthesis of Mesoporous Supraparticles on Superamphiphobic Surfaces

Wooh, Sanghyuk; Huesmann, H.; Tahir, Muhammad Nawaz; Paven, Maxime; Wichmann, Kristina; Vollmer, Doris; Tremel, Wolfgang; Papadopoulos, Periklis; Butt, Hans‐Jürgen

doi:10.1002/adma.201503929

Cited by 102 publications

(121 citation statements)

References 36 publications

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“…4,7,8 Similar structures have been created by drying droplets on superamphiphobic surfaces. 8 In this contribution, we study the structure of binary supraparticles that form inside emulsions. We obtained supraparticles with different structures when evaporating the droplets of an oil-in-water emulsion (Fig.…”

Section: Introductionmentioning

confidence: 86%

Pressure-controlled formation of crystalline, Janus, and core–shell supraparticles

et al. 2016

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aBinary mixtures of nanoparticles self-assemble in the confinement of evaporating oil droplets and form regular supraparticles. We demonstrate that moderate pressure differences on the order of 100 kPa change the particles' self-assembly behavior. Crystalline superlattices, Janus particles, and core-shell particle arrangements form in the same dispersions when changing the working pressure or the surfactant that sets the Laplace pressure inside the droplets. Molecular dynamics simulations confirm that pressuredependent interparticle potentials affect the self-assembly route of the confined particles. Optical spectrometry, small-angle X-ray scattering and electron microscopy are used to compare experiments and simulations and confirm that the onset of self-assembly depends on particle size and pressure. The overall formation mechanism reminds of the demixing of binary alloys with different phase diagrams.

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Section: Introductionmentioning

confidence: 86%

Pressure-controlled formation of crystalline, Janus, and core–shell supraparticles

et al. 2016

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“…www.advmat.de www.advancedsciencenews.com spherical solution is dried, [35,36] supraballs of different ordering and mechanical properties can be produced ( Figure 2C). …”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Structure Formation in Soft‐Matter Solutions Induced by Solvent Evaporation

et al. 2017

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etc., and the interplay between different processes determines the final structure of the dried materials.Here, we report recent advances of selfassembled structures induced by uniform evaporation, examples including drying in a thin-film geometry or evaporating a spherical droplet on a superhydrophobic surface. [4] In these situations, the structure formation takes place in the direction of the evaporation. This excludes the case where lateral flow is induced by nonuniform drying. The lateral flow is important in explaining the coffee-ring effect, where excellent reviews exist in literature. [5,6] After introducing the general procedure in experiments, we explain the physical mechanisms responsible for the structure formation in solvent evaporation. We then discuss recent advances based on single-and binarycomponent solutions, with a special emphasis on the theoretical approaches. Drying of Single-Component SolutionsA general experiment starts with spin-coating a thin-film solution on a substrate, then the sample is left to dry. In the first step, it is important that the spin-cast film is uniform. [7,8] In the second step, the evaporation flux, i.e., the mass removed from the liquid phase to the vapor phase in unit time from unit surface area needs to be controlled precisely. Even for the pure solvent evaporation, the process is complex and involves the diffusion of solvent molecules in both the liquid and vapor phases, and external flow in the vapor phase to prevent saturation. The evaporation flux can be computed using the Hertz-Knudsen equation that is based on the thermodynamics variables [9][10][11] or solving the diffusion equation in the vapor phase using suitable boundary conditions. [12][13][14] The solvent evaporation drives the free surface to recede toward the substrate, resulting in an accumulation of the solutes at the surface. Two competing processes determine the spatial distribution of the solutes. One is the Brownian motion, which is characterized by the diffusion constant D of the solutes. The other is the evaporation, characterized by the rate v ev at which the free surface recedes. Two timescales are related to these two processes: the diffusion time τ D =  2 /D, where  is a characteristic length and the evaporation time τ ev = /v ev . To quantify the relative importance between the diffusion and the evaporation, one can define a dimensionless number called film formation Peclet number: [15]

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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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Synthesis of Mesoporous Supraparticles on Superamphiphobic Surfaces

Cited by 102 publications

References 36 publications

Pressure-controlled formation of crystalline, Janus, and core–shell supraparticles

Pressure-controlled formation of crystalline, Janus, and core–shell supraparticles

Structure Formation in Soft‐Matter Solutions Induced by Solvent Evaporation

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

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