Bioinspired asymmetric-anisotropic (directional) fog harvesting based on the arid climate plant Eremopyrum orientale

Gürsoy, Mehmet; Harris, Matt; Carletto, Andrea; Yaprak, Ahmet Emre; Karaman, Mustafa; Badyal, J. P. S.

doi:10.1016/j.colsurfa.2017.06.065

Cited by 60 publications

(47 citation statements)

References 58 publications

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“…Chemical Vapor Deposition of Hydrophobic Thin Films on Paper Substrates : Polymeric thin films were deposited on paper substrates in a custom‐built iCVD system, details of which were described elsewhere . The precursors, namely monomer (HFBA and PFDA) and initiator (TBPO), were vaporized in separate jars, and fed to the vacuum chamber through metering valves.…”

Section: Methodsmentioning

confidence: 99%

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

Çıtak

İstanbullu

Şakalak

et al. 2019

Macro Chemistry & Physics

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In this study, the successful transfer of chemical vapor deposition (CVD)‐grown graphene on an ordinary printing paper surface is demonstrated. Pristine paper is not a suitable substrate for graphene transfer because of its fragile and hydrophilic nature against the chemicals used during the transfer process. Two different fluoroalkyl polymers, namely poly(hexafluorobutyl acrylate) (PHFBA) and poly(perfluorodecyl acrylate) (PPFDA) are coated on paper surfaces by an initiated CVD (iCVD) technique to make the paper surfaces hydrophobic. Hydrophobicity is found to be an important factor in order for the graphene to be transferred onto the paper substrate. Although surfaces coated with PPFDA possess better hydrophobicity owing to their longer perfluoroalkyl group and higher roughness, the graphene transfer is found to be more successful on a PHFBA‐coated surface. A thin film of PHFBA on the paper surface acts as a prime layer for effective and defect‐free transfer of graphene and makes the paper surface ideal and robust during the graphene transfer process. The as‐transferred graphene layer on the PHFBA‐coated paper surface shows high conductivity values, even after repeated folding and flattening cycles.

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Section: Methodsmentioning

confidence: 99%

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

Çıtak

İstanbullu

Şakalak

et al. 2019

Macro Chemistry & Physics

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“…There are several studies conducted to compare the efficiency of both methods for a specific application [ 14 , 15 ]. In this work, we intend to employ both methods to functionalize the PU foam surfaces and compare the resultant modified foams, particularly for the oil absorption process.…”

Section: Introductionmentioning

confidence: 99%

A Green Approach to Modify Surface Properties of Polyurethane Foam for Enhanced Oil Absorption

Roslan

Lau

et al. 2020

Polymers

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The non-selective property of conventional polyurethane (PU) foam tends to lower its oil absorption efficiency. To address this issue, we modified the surface properties of PU foam using a rapid solvent-free surface functionalization approach based on the chemical vapor deposition (CVD) method to establish an extremely thin yet uniform coating layer to improve foam performance. The PU foam was respectively functionalized using different monomers, i.e., perfluorodecyl acrylate (PFDA), 2,2,3,4,4,4-hexafluorobutyl acrylate (HFBA), and hexamethyldisiloxane (HMDSO), and the effect of deposition times (1, 5 and 10 min) on the properties of foam was investigated. The results showed that all the modified foams demonstrated a much higher water contact angle (i.e., greater hydrophobicity) and greater absorption capacities compared to the control PU foam. This is due to the presence of specific functional groups, e.g., fluorine (F) and silane (Si) in the modified PU foams. Of all, the PU/PHFBAi foam exhibited the highest absorption capacities, recording 66.68, 58.15, 53.70, and 58.38 g/g for chloroform, acetone, cyclohexane, and edible oil, respectively. These values were 39.19–119.31% higher than that of control foam. The promising performance of the PU/PHFBAi foam is due to the improved surface hydrophobicity attributed to the original perfluoroalkyl moieties of the HFBA monomer. The PU/PHFBAi foam also demonstrated a much more stable absorption performance compared to the control foam when both samples were reused for up to 10 cycles. This clearly indicates the positive impact of the proposed functionalization method in improving PU properties for oil absorption processes.

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“…[ 25–27 ] Additionally, the surface chemical composition and geometric morphology can also affect surface wettability. [ 28–36 ] By adjusting the surfaces with wettable gradients (such as structural gradients and chemical gradients), [ 37–39 ] asymmetric structures [ 40–44 ] or bioinspired structures, [ 45–51 ] a droplet spreading on these surfaces can be well manipulated. However, singly structural or chemical gradient surfaces can just carry out the conversion of surface wetting properties between hydrophobic and hydrophilic (or between hydrophobic and super‐hydrophilic) but not favor the droplet to spread or move over a long distance due to the influence of the intrinsic contact angle.…”

Section: Introductionmentioning

confidence: 99%

Large‐Range, Reversible Directional Spreading of Droplet on a Double‐Gradient Wrinkled Surface Adjusted Under Mechanical Strain

Chai

Tian

et al. 2020

Adv Materials Inter

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Dynamical regulation to unidirectional wetting has received considerable attention in recent years due to its important role in flexible electronics, microfluidics, drug transportation, and so forth. It is of great significance to prepare a surface which allows the droplet to spread directionally on it with the length of droplet reversibly fluctuated within a broad range under external stimulation. In this paper, a double‐gradient wrinkled structure is prepared by constructing the structure‐gradient pillar arrays on a mechanics‐adjusted wrinkled surface and subsequently making chemical gradient by oxygen plasma treatment. Under the synergistic effect of the structural gradient, chemical gradient, and wrinkled structure, the droplet can undergo unidirectional spreading and realize dynamic regulation of the spreading length on the flexible structure. This will provide a propagable method for the regulation of surface wetting.

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Bioinspired asymmetric-anisotropic (directional) fog harvesting based on the arid climate plant Eremopyrum orientale

Cited by 60 publications

References 58 publications

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

A Green Approach to Modify Surface Properties of Polyurethane Foam for Enhanced Oil Absorption

Large‐Range, Reversible Directional Spreading of Droplet on a Double‐Gradient Wrinkled Surface Adjusted Under Mechanical Strain

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