Self-Cleaning: From Bio-Inspired Surface Modification to MEMS/Microfluidics System Integration

Sun, Di; Böhringer, K. F.

doi:10.3390/mi10020101

Cited by 42 publications

(30 citation statements)

References 151 publications

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“…By attempting to mimic nature, we gain an increasing understanding of the complex underlying mechanisms that govern these biomolecular functions, not least through the effect of subtle structural changes that result in unprecedented properties . For example, surface porosity, a feature which nature gratefully utilizes, can have a substantial effect on the fashion in which droplets sit on the surface through the added interfacial interaction with a thermodynamically stable void or lubricating liquid in its nanogaps . An archetypal example is the lotus leaf, which through a combination of a hydrophobic molecular ensemble and its surface roughness achieves a superhydrophobic state that allows for a self‐cleaning functionality, a function that has been mimicked repeatedly with various molecular components .…”

Section: Responsive Wettabilitymentioning

confidence: 99%

Design of Active Interfaces Using Responsive Molecular Components

2019

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Responsive interfaces are interfaces that show a defined and reversible change in physical properties in response to external stimuli. Typically, responsive interfaces result from the immobilization of responsive molecular components at the interface that translate a nanoscale signal into a macroscopic effect. Responsive interfaces can also be obtained if the topology of the interface can be reversibly changed using an external stimulus. As the surface of any material is its connection to the environment, responsive interfaces provide opportunities for interactive materials which are not only able to change properties upon demand, but also sense their environment and act autonomously. The application of responsive molecular components at interfaces, however, requires chemical and physical compatibility with the material surface of interest, posing a challenge not least in the retention of the responsive functionality. The state of the art in "active" interfaces which display responsive wettability, permeability, or adhesion is discussed, with a particular emphasis on microscale and nanoscale patterning since patterned interfaces can give rise to unique material properties. Finally, perspectives in the development of responsive interfaces, as well as promising approaches for bypassing the most prominent challenges are discussed.

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Section: Responsive Wettabilitymentioning

confidence: 99%

Design of Active Interfaces Using Responsive Molecular Components

2019

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“…Inspired by nature, [ 4–7 ] superhydrophobic surfaces with extreme repellency to water have attracted significant interest, owing to their potential applications in anti‐condensation, anti‐frosting, anti‐icing, anti‐fogging, and self‐cleaning activities. [ 8–20 ] Biomimetic superhydrophobic surfaces can be prepared via different approaches, including reactive ion etching, [ 21 ] chemical/physical processing, [ 22–25 ] lithographing, [ 26,27 ] and coating. [ 28–33 ] Among these approaches, the coating approach has been widely applied, owing to its simple preparation process, low equipment requirement, and wide application range.…”

Section: Introductionmentioning

confidence: 99%

Water‐Based Robust Transparent Superamphiphobic Coatings for Resistance to Condensation, Frosting, Icing, and Fouling

Song

Cheng

et al. 2020

Adv Materials Inter

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high fraction of the total energy consumption. For example, air-conditioners and refrigerators account for more than 10% and 32% of the total residential energy consumption in China, respectively. [2,3] Therefore, improvement of the energy efficiency characterizing heat exchangers plays a crucial role in reducing energy consumption. However, the occurrence of condensate films, frost layers, and fouling on the surfaces of conventional hydrophilic heat exchangers acts as a thermal barrier to significantly reduce in the heat transfer. One alternative, that is, a periodic heating process for complete melting of the frost, results in extra energy consumption. In addition, wet surfaces are prone to the dust deposition, breeding of bacteria, and corrosion acceleration.Inspired by nature, [4][5][6][7] superhydrophobic surfaces with extreme repellency to water have attracted significant interest, owing to their potential applications in anticondensation, anti-frosting, anti-icing, antifogging, and self-cleaning activities. [8][9][10][11][12][13][14][15][16][17][18][19][20] Biomimetic superhydrophobic surfaces can be prepared via different approaches, including reactive ion etching, [21] chemical/physical processing, [22][23][24][25] lithographing, [26,27] and coating. [28][29][30][31][32][33] Among these approaches, the coating approach has been widely applied, owing to its simple preparation process, low equipment requirement, and wide application range. However, organic solvents, such as ethanol, acetone, or butyl acetate, are frequently used to dissolve or disperse low surface energy substances during the preparation process. [34,35] Compared with organic solvents, water is a green, safe, and economical solvent. [36] A few strategies have been reported about preparing waterbased superhydrophobic coatings and even water-based superamphiphobic coatings. [37][38][39][40][41][42][43][44] The focus of the present studies is on the preparation of these coatings. However, high performances of water-based superhydrophobic coatings are neglected which are the key factors in wide, long-term, and efficient application, due to the difficulty in achieving them. For example, micro-sized or smaller condensate dewdrops on most water-based superhydrophobic coatings occur in the Wenzel state, although the contact angles (CAs) and sliding angles (SAs) of macro water droplets on these coatings are >150 and <10, respectively. [45] The Wenzel-state dewdrops may lead to Due to the considerable demand for improving energy conservation and emission reduction, superhydrophobic coatings mainly derived from organic solvents have attracted significant interest, based on their potential role in enhancing heat transfer. Although water-based coatings are relatively safe and economical, and contain low volatile organic compounds (VOCs), the realization of coatings with excellent anti-condensation, anti-frosting, antiicing, and passive self-cleaning properties remains challenging, owing to the Wenzel state of small-sized condensate microdrops. Herein, ...

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“…With rapid development of nanotechnology, one of the growing trends of processing technology is manufacturing at the micro/nano scale. Structures with sub‐micrometer or nanometer feature have a wide range of applications in many fields, for example, improving surface optical properties for display and optic inspection, 1 improving the surface wetting for self‐cleaning and microfluidics, 2 improving surface abrasion resistance or helping to reduce the friction and wear of various mechanical parts and especially in the inertial confinement fusion process 3‐5 . The nanoindentation technique has been successfully applied to fabricate nanostructures on a micro‐ball in recent years 6‐10 .…”

Section: Introductionmentioning

confidence: 99%

Robust model predictive control of a micro machine tool for tracking a periodic force signal

Wang

Geng

Yan

et al. 2020

Optim Control Appl Methods

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Summary The micro machine tool that can produce nanostructures by force modulation approach plays a significant role in nanotechnology. In this paper, to guarantee fast and high‐precision cutting subject to external disturbances and input saturation, a robust model predictive control (MPC) using a tube‐based method is exploited to develop a controller for the machining system consisting of a piezoelectric tube (PZT) actuator, a force sensor and a cutting tool, which updates the state of the art. In particular, the dynamic model of the machining system, with the voltage fed into PZT being input and the cutting force being output, is identified by incorporating the map between the cutting force and the displacement of PZT. Based on the voltage‐force dynamic model, a tube‐based MPC controller that consists of two optimizers is used to make PZT actuator track a desired periodic force signal. Finally, the effectiveness of the MPC method for force signal tracking under different frequencies is validated and advantages over the conventional proportional integral controller are also shown in the presence of the constraints of saturated input and external disturbances via numerical simulations.

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Self-Cleaning: From Bio-Inspired Surface Modification to MEMS/Microfluidics System Integration

Cited by 42 publications

References 151 publications

Design of Active Interfaces Using Responsive Molecular Components

Design of Active Interfaces Using Responsive Molecular Components

Water‐Based Robust Transparent Superamphiphobic Coatings for Resistance to Condensation, Frosting, Icing, and Fouling

Robust model predictive control of a micro machine tool for tracking a periodic force signal

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