Remote Control over Underwater Dynamic Attachment/Detachment and Locomotion

Ma, Yanfei; Ma, Shuanhong; Wu, Yang; Pei, Xiaowei; Gorb, Stanislav N.; Wang, Zuankai; Liu, Weimin; Zhou, Feng

doi:10.1002/adma.201801595

Cited by 144 publications

(138 citation statements)

References 41 publications

Supporting

Mentioning

134

Contrasting

Unclassified

Order By: Relevance

“…It is well known that PNIPAm is a classical thermal‐responsive polymer, which exhibits different temperature‐induced conformation transition in water . After copolymerization of NIPAm and styrene, the P(St‐NIPAm) colloidal spheres also display decreasing mean diameter with temperature ( Figure a and Figure S4, Supporting Information), typical thermosensitive behavior similar to those reported PNIPAm‐based materials .…”

Section: Resultssupporting

confidence: 70%

“…To further achieve local and remote control of oil‐adhesion on the coating surface, we used Fe 3 O 4 nanoparticles with mean diameter of ≈30 nm (Figure S6, Supporting Information) as NIR radiation photothermal response candidates to fabricate PTRC. NIR‐infrared light has received attention due to its various advantages, such as noncontact, fast, and controllable . Figure a demonstrates digital photograph of the dried PTRC with different content of Fe 3 O 4 nanoparticles which have been uniformly distributed in the coating without obvious aggregation (Figures S7 and S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

NIR‐Triggered Photothermal Responsive Coatings with Remote and Localized Tunable Underwater Oil Adhesion

Shang

Chen

2019

Small

View full text Add to dashboard Cite

Tunable underwater oil adhesion is a critical issue in interfacial science and industrial applications. Although much progress has been made to date, development of novel smart coating materials that can selectively change the wetting property at different areas is considerably scarce. Here, a simple strategy is proposed to fabricate photothermal responsive coatings, which can change the oil adhesion behavior from low‐adhesive rolling state to high‐adhesive pinning state for a variety of oily liquids in a remote, local, and reversible manner. Owing to this unique controllability, the adhesion and no‐adhesion of oil droplets on the coated surfaces can be easily manipulated by remote and local near‐infrared radiation.

show abstract

Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

NIR‐Triggered Photothermal Responsive Coatings with Remote and Localized Tunable Underwater Oil Adhesion

Shang

Chen

2019

Small

View full text Add to dashboard Cite

show abstract

“…The lap shear test was performed after the HBPA was adhered to different substrates underwater and www.advmat.de www.advancedsciencenews.com time in water is extended to 72 h, the adhesion strength drops significantly, because of the gradual hydrolysis of ester bonds in the HBPA molecular chains ( Figure 3D-G). [14,[30][31][32][33][34][35][36] Figure 4A shows that the PE sheets glued with the HBPA (adhesion area: 2.5 cm × 2.5 cm) soaked in water for 36 h can still lift a bucket of water weighing 5 kg (Movie S2, Supporting Information). Until now, almost no literature has reported that adhesives can exhibit such high adhesion strength to PTFE and PE even in the dry state ( Figure 3H).…”

Section: Doi: 101002/adma201905761mentioning

confidence: 99%

Water‐Triggered Hyperbranched Polymer Universal Adhesives: From Strong Underwater Adhesion to Rapid Sealing Hemostasis

et al. 2019

View full text Add to dashboard Cite

is greatly decreased or even eliminated. For instance, the widely used cyanoacrylate adhesives exhibit strong adhesion in air, but when applied in water environment, they are hardened quickly to form a layer of stiff plastics, eventually resulting in the loss of adhesion. [9] The commercially available epoxy resins [10] and polyurethanes [11] are reported to demonstrate strong underwater adhesion, but long time of curing is usually required. Recently, host-guest chemistry strategy was reportedly employed to prepare underwater adhesives; however, the substrate surface needs to be modified in advance. [5,12] In addition, electrostatic and hydrophobic interactions were also proved to contribute to enhanced underwater adhesion, but the adhesion strength was relatively poor. [13,14] In nature, many organisms, such as mussels, barnacles, and castle worms, have evolved an unparalleled mechanism to perfectly tackle the underwater adhesion problem. [15][16][17] The finding of universality of catechol chemistry for wet adhesion has provided a valuable biomimetic source to develop diverse adhesives for use in aqueous environments. However, several problems, such as the complexity of administration, release of harmful organic solvents, [18,19] long-term curing, [2] need for oxidant addition, [20,21] and low adhesion strength, [18,22] may hamper the actual applications of these bioinspired adhesives. Although numerous dopamine-based adhesives have been reported and shown to bond various material surfaces, strong adhesion in water and particularly blood environment, remains nonexistent so far.Increasing studies on bioadhesives secreted by molluscs and insects have suggested that liquid coacervation plays a critical role in achieving underwater adhesion. [13] In this process, phase separation and concurrently increased hydrophobicity induced by coacervation can dispel the hydrated water on the interface, leading to much enhanced interaction of adhesive groups with the adherent and thus stable underwater adhesion. Up to date, several complex coacervate adhesives with linear structure have been reported, but the occurrence of those coacervations in water needs external triggers, such as temperature, [13] pH, [20,23] and iron strength. [24] Compared to linear counterparts, hyperbranched polymer (HBP) has a unique highly branched Despite recent advance in bioinspired adhesives, achieving strong adhesion and sealing hemostasis in aqueous and blood environments is challenging. A hyperbranched polymer (HBP) with a hydrophobic backbone and hydrophilic adhesive catechol side branches is designed and synthesized based on Michael addition reaction of multi-vinyl monomers with dopamine.It is demonstrated that upon contacting water, the hydrophobic chains selfaggregate to form coacervates quickly, displacing water molecules on the adherent surface to trigger increased exposure of catechol groups and thus rapidly strong adhesion to diverse materials from low surface energy to high energy in various environments, such as deionized water, sea ...

show abstract

“…Specifically, the mucus with interpenetrating positively charged chemistries produce pedal waves; this in all creates an adhesive and elastic dissipative matrix, and guides the movement of slugs on attached surfaces . Hence, structural features within the as‐mentioned organisms have built the platform of bioinspired adhesive systems for potential use in clean transfer systems, soft robotics, stimuli‐responsive adhesives for dry or wet surfaces, and various wearable devices with diagnostic and therapeutic functionalities …”

Section: Introductionmentioning

confidence: 99%

Bioinspired Adhesive Architectures: From Skin Patch to Integrated Bioelectronics

et al. 2019

View full text Add to dashboard Cite

on dry and rough surfaces (maximum ≈10 N cm −2 ). [1] Close observations have indicated nanoscale hairs of high aspect ratio (AR) with slated tips. [21][22][23][24][25][26][27][28][29][30] This geometry allows directional appliance of van der Waals forces against engaged surfaces for stable attachment. The attachment strategies and fixation systems of beetles have also been investigated. [9] Concave, mushroom-shaped architectures on the forelegs of beetles ensure stable adherences onto rough, waxy surfaces [31][32][33][34][35][36] or locomotion via capillary adhesion. [37][38][39] Studies on their attachment systems revealed that the mushroom-shaped structures with wide concave tips can generate van der Waals interactions [40] as well as a suction effect against engaged surfaces. [41,42] Moreover, needles located in the proboscis of mosquitos [43][44][45][46] or endoparasites (e.g., Pomphorhynchus laevis) [47] alike, induce mechanical interlocking on dry skin or wet organs. The needles provide strong adhesion in both normal and shear directions for the insect species to easily consume nutrients. Recently, the architectures of octopus suckers were investigated to understand their underlying attachment mechanism. Existing in clusters on octopus tentacles, suction cups are crucial for octopi's survival underwater for functions such as preying, grasping, locomotion, and even sensing. The cup-shaped protruding chamber (infundibulum) is known to adapt and seal conformably on rough surfaces. [12,13,15,48] Meanwhile, the dome-like protuberance in the lower chamber (acetabulum) forms pressure difference between the segregated lower and upper chambers within the suction cup architecture. [49] This enhances suction stress to adhere strongly onto wet or underwater surfaces. The footpads of slugs are covered with structures of microscale compression waves with viscous mucus. This can be used to both lubricate a slug's movement over surfaces and facilitate the transfer of adhesive force to the engaged surfaces. [16,19,20,[50][51][52] Specifically, the mucus with interpenetrating positively charged chemistries produce pedal waves; this in all creates an adhesive and elastic dissipative matrix, and guides the movement of slugs on attached surfaces. [53] Hence, structural features within the as-mentioned organisms have built the platform of bioinspired adhesive systems for potential use in clean transfer systems, [54][55][56][57][58][59] soft robotics, [60,61] stimuli-responsive adhesives for dry or wet surfaces, [62][63][64] and various wearable devices with diagnostic and therapeutic functionalities. [65][66][67][68][69] Among various applications of bioinspired multiscale architectures, patches attachable to skin have been of high interest (Figure 1b). Human skin, the outermost organ of the human The attachment phenomena of various hierarchical architectures found in nature have extensively drawn attention for developing highly biocompatible adhesive on skin or wet inner organs without any chemical glue. Structural adhesive sy...

show abstract

Remote Control over Underwater Dynamic Attachment/Detachment and Locomotion

Cited by 144 publications

References 41 publications

NIR‐Triggered Photothermal Responsive Coatings with Remote and Localized Tunable Underwater Oil Adhesion

NIR‐Triggered Photothermal Responsive Coatings with Remote and Localized Tunable Underwater Oil Adhesion

Water‐Triggered Hyperbranched Polymer Universal Adhesives: From Strong Underwater Adhesion to Rapid Sealing Hemostasis

Bioinspired Adhesive Architectures: From Skin Patch to Integrated Bioelectronics

Contact Info

Product

Resources

About