Flexible Transparent Hierarchical Nanomesh for Rose Petal‐Like Droplet Manipulation and Lossless Transfer

Wong, William S. Y.; Nasiri, Noushin; Liu, Guanyu; Rumsey-Hill, Nicholas; Craig, Vincent S. J.; Nisbet, David R.; Tricoli, Antonio

doi:10.1002/admi.201500071

Cited by 36 publications

(34 citation statements)

References 39 publications

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“…The SA and CAH analysis during dynamic strain revealed further insights on the properties of these tunable surfaces. No transitional behavior was detected for the 0% prestretched films independently of the applied dynamic strain, with SAs and CAHs being within those reported for rose petal‐like adhesive hydrophobicity regimes (Figure b). A distinctive transitional behavior was found for the 40% prestretched films, with the SA switching from repulsive superhydrophobicity to adhesive superhydrophobic droplet pinning (Figure c) at a dynamic strain of 40%.…”

Section: Resultssupporting

confidence: 75%

Strain Engineering of Wave‐like Nanofibers for Dynamically Switchable Adhesive/Repulsive Surfaces

Wong

Gutruf

Sriram

et al. 2015

Adv Funct Materials

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399wileyonlinelibrary.com number of coatings utilized in tissue engineering, [ 5 ] microfl uidics, [ 6,7 ] and drug delivery. [ 8 ] In particular, owing to their advantages of not requiring bulk peristaltic systems, dynamically switchable [ 1,9 ] superhydrophobic and hydrophilic surfaces [ 10,11 ] are a potential cornerstone of next generation microfl uidics devices. [ 7,12 ] Recently, tunable [ 11 ] surfaces based on arrays of aligned nanopillars have been achieved by controlled shapeshifting of surface texturing and wettability. [ 8,13 ] However, the wide-spread utilization of such lithography-based ordered structures [ 14 ] is limited due to their limited scalability and high fabrication cost. Thus, the ability to achieve dynamic tuning of surface wetting with disordered morphologies is critical for their commercial application.Strain-induced modifi cation of the morphological features of a fi lm such as wrinkling and buckling is a fl exible actuation mechanism that is found in a multitude of scales in nature. These range from biocellular epidermal layers of skin [ 15 ] to geological wrinkles. [ 16 ] In synthetic processes, the spontaneous wrinkling of thin fi lms [ 17 ] has traditionally been treated as a defect, with signifi cant efforts directed toward the fabrication of perfectly fl at surfaces. [ 18 ] Recently, artifi cial skin-like wrinkling materials have been proposed as a powerful multifunctional structure for several applications including fl exible electronics, [ 19,20 ] self-assembling 3D architectures, [ 21,22 ] bioactive materials, [ 5,23 ] particle sieves, [ 15 ] and membrane technologies. [ 4,24 ] These multifunctional materials are commonly fabricated by deposition of fl at 2D solid thin fi lms such as silica, [ 15,23 ] gold, [ 5,25 ] carbon nanotubes, [ 26 ] graphene, [ 27 ] and thin polystyrene fi lms [ 28 ] on prestretched elastomeric substrates. Relaxation of the prestretched substrate wrinkles the top fi lm into a multiscale nano-micro rough hierarchical structure, with demonstrated potential for enabling tunable wettability. [ 5 ] Here, we demonstrate an alternative concept to achieve dynamically reversible wetting from hydrophobic to superhydrophobic and switchable droplet adhesion/repulsion. Our method is based on the facile and scalable incorporation of polystyrene nanofi ber layers on soft elastic substrates. By anisotropic stretching and self-relaxation of the elastic substrate, the originally 1D nanofi bers are reversibly transformed into Engineering surfaces that enable the dynamic tuning of their wetting state is critical to many applications including integrated microfl uidics systems, fl exible electronics, and smart fabrics. Despite extensive progress, most of the switchable surfaces reported are based on ordered structures that suffer from poor scalability and high fabrication costs. Here, a robust and facile bottom-up approach is demonstrated that allows for the dynamical and reversible switching between lotus leaf (repulsive) and rose petal (adhesive) states by strain engin...

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Section: Resultssupporting

confidence: 75%

Strain Engineering of Wave‐like Nanofibers for Dynamically Switchable Adhesive/Repulsive Surfaces

Wong

Gutruf

Sriram

et al. 2015

Adv Funct Materials

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“…To evaluate the liquid loss during the MRS transfer process31, we compared the volumes of droplets before and after transfer using a 4-hydrophilic-fibre MRS (Fig. 3d).…”

Section: Resultsmentioning

confidence: 99%

Mechano-regulated surface for manipulating liquid droplets

et al. 2017

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The effective transfer of tiny liquid droplets is vital for a number of processes such as chemical and biological microassays. Inspired by the tarsi of meniscus-climbing insects, which can climb menisci by deforming the water/air interface, we developed a mechano-regulated surface consisting of a background mesh and a movable microfibre array with contrastive wettability. The adhesion of this mechano-regulated surface to liquid droplets can be reversibly switched through mechanical reconfiguration of the microfibre array. The adhesive force can be tuned by varying the number and surface chemistry of the microfibres. The in situ adhesion of the mechano-regulated surface can be used to manoeuvre micro-/nanolitre liquid droplets in a nearly loss-free manner. The mechano-regulated surface can be scaled up to handle multiple droplets in parallel. Our approach offers a miniaturized mechano-device with switchable adhesion for handling micro-/nanolitre droplets, either in air or in a fluid that is immiscible with the droplets.

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“…No‐loss transportation of liquid is useful in biological and microfluidic applications . The honeycomb‐patterned and pincushion‐like films can be applied in no‐loss water transportation.…”

Section: Resultsmentioning

confidence: 99%

Multiple Liquid Manipulations on Patterned Surfaces with Tunable Adhesive Property

Zhong

et al. 2017

Adv Materials Inter

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Micro/nanostructured surfaces with designable wettability show great promise in many fields. This paper reports a new strategy for fabricating superhydrophobic surfaces with tunable water adhesion force by combining multiscale surface structures and mussel‐inspired surface chemistry, which can be used for multiple liquid manipulations. Highly ordered porous films prepared by the breath figure method enable convenient construction of surfaces with honeycomb‐patterned or nanosized pincushion‐like structures. Multiple liquid manipulations including no‐loss transportation of water droplets, water collection, programmable movement of water droplets, and chemical reaction monitoring are demonstrated on the micro/nanostructured surfaces. The proposed method is facile, energy‐efficient, and can be conducted for the preparation of superhydrophobic surfaces with high contrast adhesion patterns.

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Flexible Transparent Hierarchical Nanomesh for Rose Petal‐Like Droplet Manipulation and Lossless Transfer

Cited by 36 publications

References 39 publications

Strain Engineering of Wave‐like Nanofibers for Dynamically Switchable Adhesive/Repulsive Surfaces

Strain Engineering of Wave‐like Nanofibers for Dynamically Switchable Adhesive/Repulsive Surfaces

Mechano-regulated surface for manipulating liquid droplets

Multiple Liquid Manipulations on Patterned Surfaces with Tunable Adhesive Property

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