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Book ChapterDOI

Superhydrophobic and Superoleophobic Surfaces in Composite Materials

TL;DR: In this paper, the basic physical understanding and the structure-property correlations of the liquid-repelling surfaces are discussed. And the authors report the recent progress achieved toward the development of artificial liquid repellent surfaces by mimicking the natural ones.
Abstract: Liquid-repelling surfaces have received tremendous attention owing to their unique self-cleaning, anti-icing, anti-sticking, and antireflective properties. Various natural surfaces, owing to their specific surface structure, exhibit high water/oil repellency. Study of such naturally occurring superhydrophobic/superoleophobic surfaces has led to the understanding that the wettability of surfaces depends on their surface energy and surface structure. Surfaces with multilevel roughness exhibit high contact angles due to formation of air–liquid interfaces. The present chapter reviews the basic physical understanding and the structure–property correlations of the liquid-repelling surfaces. The chapter further explores the structures of various naturally occurring liquid-repellent surfaces and reports the recent progress achieved toward the development of artificial liquid-repellent surfaces by mimicking the natural ones. Finally, various techniques being employed to fabricate such surfaces have been described.
Citations
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Journal ArticleDOI
TL;DR: In vivo pharmacokinetic study was carried out to compare the optimized system relative to the market product and revealed that superamphiphobic substrates were successfully prepared showing a rough micro-sized hierarchical structured surface upon observing with scanning electron microscope.
Abstract: Controlled-release multiparticulate systems of hydrophilic drugs usually suffer from poor encapsulation and rapid-release rate. In the present study, ultra-high loaded controlled release polymeric ...

8 citations


Cites background from "Superhydrophobic and Superoleophobi..."

  • ...show high contact angles (CA) for both water and oil liquids respectively (Manna et al., 2017)....

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  • ...Instead, superamphiphobic surfaces that show high contact angles and low wettability for both water and organic oils (Manna et al., 2017) could be a more promising universal method in drug formulations as it doesn’t offer any restrictions on the polymer type or the solvent used....

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  • ...Characterization of the prepared superamphiphobic substrates Superamphiphobic substrates are substrates that possess both hydrophobic and oleophobic nature; i.e. show high contact angles (CA) for both water and oil liquids respectively (Manna et al., 2017)....

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Journal ArticleDOI
TL;DR: In this paper, the authors showed that the addition of these materials alleviated the effects of radical temperature and humidity changes on glaze layer and matrix, and effectively delayed the occurrence of glaze shedding.
Abstract: Silicon materials containing fluorine with similar nanoscale particles (SIC-1 and SIC-2) and organic silicon resin materials with excellent hydrophobicity (SIC-3) were selected to deal with glaze shedding and damage of glazed tiles in ancient buildings. Experimental analysis on the hydrophobic properties and microscopic morphology of the materials, as well as the changes of the surface temperature and the shedding rate of glaze layer after adding protective materials indicated: the thermal expansion differences and the shedding rate of glaze layer following sharp changes of temperature and humidity had been decreased. In particular, with the help of protective material SIC-2, a silicon material containing fluorine, there was the smallest change in the color of the glaze layer; the hydrophobic property and the water vapor transmittance of matrix were also improved. In a nutshell, the results showed that the addition of these protective materials alleviated the effects of radical temperature and humidity changes on glaze layer and matrix, and effectively delayed the occurrence of glaze shedding.

5 citations


Cites background from "Superhydrophobic and Superoleophobi..."

  • ...In the equation, ɵ1 and ɵ2 are the contact angles of composition 1 and composition 2 on the ideal surface; f1 and f2 are the area fractions of the two components respectively in the whole surface [28, 29]....

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Journal ArticleDOI
TL;DR: In this article , the authors provide a sustainable tool for oily pollutant remediation using stimuli-responsive hydrogel membranes, and highlight the environmental impact of the use of smart hydrogels for oil/water separation.
Abstract: Hydrogels that are smart and intelligent can change their conformation and properties in response to various external stimuli, which has made this research topic quite popular. More significantly, the fact that hydrogels could absorb and release large amounts of water without damaging their structure has led to their widespread use in water treatment and purification. Besides, the fouling problem arising for highly effective oil/water emulsion separation has been successfully solved by manipulating the surface architecture of hydrogel material to obtain membranes with tunable pores and morphology, strong water affinity, hydration ability, and anti-oil-fouling. Therefore, this review provides a sustainable tool for oily pollutant remediation using stimuli-responsive hydrogel membranes. Herein, insights on smart hydrogel processing techniques, intelligent stimuli-responsive hydrogels for oil/water separation, and their mechanisms were highlighted. In addition, the environmental impact of the use of smart hydrogels for oil/water separation was outlined. This review is anticipated to offer some direction for the study and use of environmentally stimuli-responsive hydrogels for remediating oily pollutants in water.
References
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Journal ArticleDOI
29 Aug 1997-Science
TL;DR: In this article, a general approach for multilayers by consecutive adsorption of polyanions and polycations has been proposed and has been extended to other materials such as proteins or colloids.
Abstract: Multilayer films of organic compounds on solid surfaces have been studied for more than 60 years because they allow fabrication of multicomposite molecular assemblies of tailored architecture. However, both the Langmuir-Blodgett technique and chemisorption from solution can be used only with certain classes of molecules. An alternative approach—fabrication of multilayers by consecutive adsorption of polyanions and polycations—is far more general and has been extended to other materials such as proteins or colloids. Because polymers are typically flexible molecules, the resulting superlattice architectures are somewhat fuzzy structures, but the absence of crystallinity in these films is expected to be beneficial for many potential applications.

9,593 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present an attempt towards a unified picture with special emphasis on certain features of "dry spreading": (a) the final state of a spreading droplet need not be a monomolecular film; (b) the spreading drop is surrounded by a precursor film, where most of the available free energy is spent; and (c) polymer melts may slip on the solid and belong to a separate dynamical class, conceptually related to the spreading of superfluids.
Abstract: The wetting of solids by liquids is connected to physical chemistry (wettability), to statistical physics (pinning of the contact line, wetting transitions, etc.), to long-range forces (van der Waals, double layers), and to fluid dynamics. The present review represents an attempt towards a unified picture with special emphasis on certain features of "dry spreading": (a) the final state of a spreading droplet need not be a monomolecular film; (b) the spreading drop is surrounded by a precursor film, where most of the available free energy is spent; and (c) polymer melts may slip on the solid and belong to a separate dynamical class, conceptually related to the spreading of superfluids.

6,042 citations

Journal ArticleDOI
30 Apr 1997-Planta
TL;DR: It is shown here for the first time that the interdependence between surface roughness, reduced particle adhesion and water repellency is the keystone in the self-cleaning mechanism of many biological surfaces.
Abstract: The microrelief of plant surfaces, mainly caused by epicuticular wax crystalloids, serves different purposes and often causes effective water repellency. Furthermore, the adhesion of contaminating particles is reduced. Based on experimental data carried out on microscopically smooth (Fagus sylvatica L., Gnetum gnemon L., Heliconia densiflora Verlot, Magnolia grandiflora L.) and rough water-repellent plants (Brassica oleracea L., Colocasia esculenta (L.) Schott., Mutisia decurrens Cav., Nelumbo nucifera Gaertn.), it is shown here for the first time that the interdependence between surface roughness, reduced particle adhesion and water repellency is the keystone in the self-cleaning mechanism of many biological surfaces. The plants were artificially contaminated with various particles and subsequently subjected to artificial rinsing by sprinkler or fog generator. In the case of water-repellent leaves, the particles were removed completely by water droplets that rolled off the surfaces independent of their chemical nature or size. The leaves of N. nucifera afford an impressive demonstration of this effect, which is, therefore, called the “Lotus-Effect” and which may be of great biological and technological importance.

5,822 citations