Stimuli‐Responsive Surfaces for Tunable and Reversible Control of Wettability

Huang, Xu; Sun, Yiping; Soh, Siowling

doi:10.1002/adma.201501578

Cited by 122 publications

(77 citation statements)

References 30 publications

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“…[66] Besides, because the liquid-transport ability can be controlled by manipulating the surface wettability, smart peristome-inspired surfaces can be prepared by constructing stimulus-responsive materials on the surfaces. [60,67,68] This will result in a controllable liquid flow on the surface, showing wide applications in mechanical engineering, including in controllable self-lubrication (Figure 4c), and heat or mass transfer. [69] In addition, one of the important applications of peristome-mimetic structures could be in microfluidics, [70] and the unidirectional liquid transport on the biomimetic structure in channels could be used for smart and controllable microfluidic devices (Figure 4d), for example, the lab-on-a-chip.…”

Section: Applications Of Peristome-inspired Surfacesmentioning

confidence: 99%

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

et al. 2017

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The slippery peristome of the pitcher plant Nepenthes has attracted much attention due to its unique function for preying on insects. Recent findings on the peristome surface of Nepenthes alata demonstrate a fast and continuous unidirectional liquid transport, which is enabled by the combination of a pinning effect at the sharp edges and a capillary rise in the wedge, deriving from the multiscale structure, which provides inspiration for designing and fabricating functional surfaces for unidirectional liquid transport. Developments in the fabrication methods of peristome‐inspired surfaces and control methods for liquid transport are summarized. Both potential applications in the fields of microfluidic devices, biomedicine, and mechanical engineering and directions for further research in the future are discussed.

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Section: Applications Of Peristome-inspired Surfacesmentioning

confidence: 99%

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

et al. 2017

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“…Huang et al [140] demonstrate the ability to reversibly switch between superhydrophobic and superhydrophilic states with the expansion of various stimuli-responsive acrylamide-based hydrogels coated with silanized glass particles. Increases in tensile strain, pH, or temperature disrupt the superhydrophobic glass particle coating, revealing the underlying hydrophilic hydrogel.…”

Section: Tension-responsive Systemsmentioning

confidence: 99%

Mechanoresponsive materials for drug delivery: Harnessing forces for controlled release

Wang

Kaplan

Colson

et al. 2017

Advanced Drug Delivery Reviews

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Mechanically-activated delivery systems harness existing physiological and/or externally-applied forces to provide spatiotemporal control over the release of active agents. Current strategies to deliver therapeutic proteins and drugs use three types of mechanical stimuli: compression, tension, and shear. Based on the intended application, each stimulus requires specific material selection, in terms of substrate composition and size (e.g., macrostructured materials and nanomaterials), for optimal in vitro and in vivo performance. For example, compressive systems typically utilize hydrogels or elastomeric substrates that respond to and withstand cyclic compressive loading, whereas, tension-responsive systems use composites to compartmentalize payloads. Finally, shear-activated systems are based on nanoassemblies or microaggregates that respond to physiological or externally-applied shear stresses. In order to provide a comprehensive assessment of current research on mechanoresponsive drug delivery, the mechanical stimuli intrinsically present in the human body are first discussed, along with the mechanical forces typically applied during medical device interventions, followed by in-depth descriptions of compression, tension, and shear-mediated drug delivery devices. We conclude by summarizing the progress of current research aimed at integrating mechanoresponsive elements within these devices, identifying additional clinical opportunities for mechanically-activated systems, and discussing future prospects.

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“…[91] In addition to the above important progress, two or more external stimuli are more effective for controlling liquid wetting and meeting the requirements of basic research and practical applications than a single stimulus. [88,89,[92][93][94] …”

Section: Multistimuli-responsive Surfacesmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

102

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External‐field‐responsive liquid transport has received extensive research interest owing to its important applications in microfluidic devices, biological medical, liquid printing, separation, and so forth. To realize different levels of liquid transport on surfaces, the balance of the dynamic competing processes of gradient wetting and dewetting should be controlled to achieve good directionality, confined range, and selectivity of liquid wetting. Here, the recent progress in external‐field‐induced gradient wetting is summarized for controllable liquid transport from movement on the surface to penetration into the surface, particularly for liquid motion on, patterned wetting into, and permeation through films on superwetting surfaces with external field cooperation (e.g., light, electric fields, magnetic fields, temperature, pH, gas, solvent, and their combinations). The selected topics of external‐field‐induced liquid transport on the different levels of surfaces include directional liquid motion on the surface based on the wettability gradient under an external field, partial entry of a liquid into the surface to achieve patterned surface wettability for printing, and liquid‐selective permeation of the film for separation. The future prospects of external‐field‐responsive liquid transport are also discussed.

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Stimuli‐Responsive Surfaces for Tunable and Reversible Control of Wettability

Cited by 122 publications

References 30 publications

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

Mechanoresponsive materials for drug delivery: Harnessing forces for controlled release

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

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