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- 주제어 : Liquid-Repellent Surfaces (검색결과 14 건)
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Shape Control of Supraparticles Synthesized on Liquid Repellent Surfaces
김지혜,우상혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Recently drying colloidal dispersion on liquid repellent surface has been numerous studied since it allows synthesizing various sizes and types of porous supraparticles. In this study, we suggest a method to vary the shapes of the supraparticles by controlling depinning speed of contact line. The depinning speed of dispersion droplet was controlled by adding surfactants that results in various shapes (sphere, hemispherical and flat) of supraparticles after drying solvents on liquid repellent surface.
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Kim Hyeonjin,Fujii Syuji,Wooh Sanghyuk 한국화학공학회 2025 Korean Journal of Chemical Engineering Vol.42 No.8
Surface-templated evaporation-driven (S-TED) synthesis, a technique for producing supraparticles by drying colloidal dispersion droplets on liquid-repellent surfaces, off ers numerous advantages over conventional solvent-based synthesis methods. For example, the S-TED method requires no toxic solvent, heating, or additional purifi cation steps. Moreover, this approach allows precise control of supraparticle porosity and size with a narrow size distribution. However, despite extensive eff orts, only a limited range of supraparticles shapes with diff erent curvatures have been fabricated. This work introduces a novel approach for three-dimensional manipulation of supraparticle shapes using multiple liquid-repellent surfaces as drying templates. Thin polyethylene terephthalate (PET) plates with varied wettable surfaces and shapes are used as templates. Droplets covered by the PET plates evaporate in two diff erent modes, involving constant contact line or constant height. These modes considerably infl uence the shape of supraparticles. In the constant contact line mode, the shape of the PET plates determines the supraparticle shape. In addition, polyhedral shapes can be precisely fabricated by varying the numbers of the PET plates, broadening the range of achievable supraparticle shapes.
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Evaporation Driven Surface-Templated Supraparticle Synthesis
우상혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Supraparticles have been synthesized by solution process which is difficult to control shapes, sizes and materials. Even though supraparticles have great functionalities and potentials, this limited shape, size and material have been serious huddles of supraparticle researches. Recently we have developed a strategy to synthesize spherical supraparticles on superamphiphobic surfaces with various sizes and components. Due to the strong liquid repellency of superamphiphobic surface, spherical supraparticles could be formed by drying of nanoparticle dispersion with constant contact angle. During the process, no energy consumption and wasting chemicals were applied. By applying magnetic colloids and tuning dispersity of the drop, shapes and porosities of the supraparticles can be controlled. In addition, drying dispersion drop by using Ouzo effect is introduced that allows supraparticle synthesis on normal flat hydrophobic surface by self-lubricating colloidal dispersion evaporation.
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습윤 유도 미세 패터닝을 통한 기계적으로 견고한 발액성 표면의 제작
최수현(S. H. Choi),김석(S. Kim),조영태(Y. T. Cho) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
초발수 표면은 물방울과 접촉하는 표면 사이의 접촉각이 150° 이상인 표면으로 방빙, 방오, 자가세정, 부식 방지 등의 다양한 기능이 나타나며 이러한 표면은 나 노-마이크로 구조물을 표면에 새김으로써 제작할 수 있다. 그리고 물 이외의 비극성 액체에 대해 액적과 접촉하는 표면 사이의 접촉각이 150° 이상인 표면을 초발유 표면이라 하며, 위 두가지 특성이 동시에 구현된 표면을 발액성 표면(Liquid-repellent Surfaces)이라 한다. 기존의 연구에서 마이크로 패턴의 상단부가 수평방향으로 돌출된 재진입(Reentrant) 구조일 경우, 옴니포빅 표면이 제작됨을 보였다. 이에 본 논문에서는 마이크로 패턴이 형성된 표면 위에 액체 상태의 UV 경화 수지를 접촉하였을 때, 모세관력에 의해 발생하는 습윤을 이용하여 빠르고 간단하게 재진입 구조를 형성하는 공정을 개발하였다. 실험에 사용된 마이크로 패턴은 높이 10, 폭 3 μm 의 Interconnected Wall Array 이며, 공정의 주요 변수로 UV 경화 수지의 점도와 코팅 두께 그리고 마이크로 패턴과 UV 경화 수지 코팅 필름의 접촉 시간으로 설정하여 실험하였다. 실험결과, UV 경화 수지의 코팅 두께에 따라 재진입 구조물의 상단부 폭이 변화하였으며, 상단부 폭이 약 7 μm 인 재진입 구조가 형성된 표면에서 Di-water 와 Olive Oil 액적에 대해 최대 140° 이상의 발액 특성을 가진 표면이 제작됨을 확인하였다.
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Evaporation driven synthesis of supraparticles on liquid repellent surfaces
김지혜,심원미,조성민,우상혁 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
Major research efforts have recently focused on the fabrication of supraparticles from primary nano/micro colloidal particles. A relatively new and key development in thisfield was surface-templatedevaporation driven synthesis (STED), which is a method to synthesize supraparticles by drying droplets ofcolloidal dispersions on liquid repellent surfaces. This method permits various colloidal particles to beassembled into supraparticles. Specifically, the low contact line friction of the dispersion-containingdroplets on liquid repellent surfaces promotes the assembly of primary colloidal particles at the end ofevaporation, yielding supraparticles. The STED method is advantageous by enabling the synthesis ofsupraparticles of various functions, sizes, shapes, compositions, and morphologies. Here, we present anoverview of the STED method for supraparticle syntheses, including the (i) fundamental principles of themethod and (ii) strategies to tailor the characteristics of supraparticles.
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