Superhydrophobic gecko feet with high adhesive forces towards water and their bio-inspired materials

Liu, Kesong; Du, Jiexing; Wu, Juntao; Jiang, Lei

doi:10.1039/c1nr11369k

Cited by 325 publications

(228 citation statements)

References 51 publications

(58 reference statements)

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“…To mechanistically understand the fouling behaviors of the pristine PVDF membrane and the fabricated composite membranes, force spectroscopy was conducted with a force tensiometer (Sigma701, Attention, Finland) to probe the underwater interaction between a crude oil droplet and the membrane surfaces [25,[56][57][58]. In these force spectroscopic experiments, the membrane samples were fixed at the bottom of a transparent test cell filled with electrolyte solution.…”

Section: Underwater Oil-adhesion Force Measurementsmentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

123

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a b s t r a c tThe efforts of developing anti-oil-fouling membranes have so far been focusing on tailoring membrane surface wetting properties, whereas the impacts of surface charge are often eclipsed. In this study, we investigated the impacts of surface charge and wetting property on oil fouling kinetics in membrane distillation (MD). Two composite membranes with in-air hydrophilic and underwater oleophobic surfaces, one of positive charge and the other of negative charge, were fabricated by modifying a hydrophobic polyvinylidene fluoride (PVDF) membrane with hydrophilic polyelectrolytes with different charges. The modified composite membranes were compared with the reference PVDF membrane for their contact angles, adhesion force curves, and fouling kinetics in MD processes. It was found that the negatively charged composite membrane performed the best in mitigating fouling by the negatively charged oil emulsion, followed by the positively charged composite membrane, with the pristine PVDF membrane being the most susceptible to oil fouling in MD experiments. The results from underwater oil CA measurements and oil probe force spectroscopy corroborated the results in the fouling experiments. The impact of surface charges on oil-membrane interaction and associated mechanism were also discussed.

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Section: Underwater Oil-adhesion Force Measurementsmentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

123

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“…7 It has also been suggested that the nanowire-structured bristles of gecko feet enable high adhesion to solid and liquid drops arising from the wetting-induced structure rebuilding of the nanowire array. 8,9 Such natural phenomena have inspired materials scientists to more closely examine the wetting behavior of fibrous media, [10][11][12][13] resulting in the development of numerous bio-inspired artificial fibrous systems with special wettability properties. To date, most endeavors have focused on developing either anisotropic fibers for water collection 4,5 and pumping 14 or a vertically aligned fiber array for controllable morphologies through capillarity-induced self-assembly.…”

Section: Introductionmentioning

confidence: 99%

A bio-inspired flexible fiber array with an open radial geometry for highly efficient liquid transfer

et al. 2014

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Generally, highly efficient liquid transfer is difficult to achieve in open fibrous systems, as compared with traditional closed systems, because capillary coalescence frequently occurs when fiber arrays interact with a liquid. Dandelion pappi, which are flexible fiber arrays with open radial geometries, exhibit the unique ability to capture and hold large amounts of water steadily. Drawing inspirations from this natural system, we developed an artificial flexible glass fiber array with a radial geometry that is capable of holding large volumes of liquid and controllably transferring the liquid onto a substrate. The highly efficient liquid transfer of the open fibrous array can be attributed to the synergistic effects of the flexibility of fibers that radially arranged with a big open angle that enables a distinct elastic deformation of the fibers and the consequent formation of a large space within the fiber array for liquid storage, and the highly adhesive property of fibers that helps the pining of three-phase contact line on the fibers. This unique open system may provide a novel strategy for highly efficient and controllable liquid transfer.

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“…1. Due to the superhydrophobicity of gecko's toes [33,34], it is reasonable to infer that nano-bubbles can form on gecko's foot and contribute to gecko adhesion underwater.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface wettability on gecko adhesion underwater

Peng

Wang

Chen

2014

Colloids and Surfaces B: Biointerfaces

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Superhydrophobic gecko feet with high adhesive forces towards water and their bio-inspired materials

Cited by 325 publications

References 51 publications

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

A bio-inspired flexible fiber array with an open radial geometry for highly efficient liquid transfer

Effects of surface wettability on gecko adhesion underwater

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