Synthesis of Aligned Carbon Nanofibers on Electrochemically Preroughened Silicon

Wang, Q.; Ren, Shoutian; Liu, W. J.

doi:10.1021/jp802044e

Cited by 23 publications

(27 citation statements)

References 51 publications

(61 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 44–47 ] Furthermore, the legs of arthropods rendered the nonwetting properties facilitated by the hierarchical nano‐ or micro‐structures providing an air cushion. [ 48–50 ] Hence, the use of wax patterns printed on the porous structures of paper economically optimized to take the most advantage of the surface tension without any surface modification or the use of metal. To fabricate an aquatic insect robot, we followed the morphology of early development, the omega‐shaped (Ω) robot, with four legs and rectangular body made of shape memory alloys or oligomers.…”

Section: Resultsmentioning

confidence: 99%

Paper Robotics: Self‐Folding, Gripping, and Locomotion

Ryu

Mohammadifar

Tahernia

et al. 2020

Adv Materials Technologies

View full text Add to dashboard Cite

a century, sensational engineering efforts have been performed to develop new synthetic materials, and intensive studies of forces needed to deform those soft materials have examined the use of pneumatic, thermal, electrical, and chemical energy. [11][12][13] The second research stream designs low-profile, sheet-like robots, named "robotic origamis" (or "robogamis") that offer softness and reconfigurability with multiple bending degrees of freedom. [8][9][10] In robogamis, the rigid sheets are connected through soft joints, where 2D patterns can be folded into 3D structures by low profile actuations such as electrostatic forces, shape memory alloys, and pneumatic pressures. [2] Such robogamis can autonomously transform themselves into programmed shapes and perform complex tasks in unpredictable environments. Substantial progress in soft material research has produced achievements that are critical in terms of robogami techniques [2] while soft robotics and origami folding concepts have opened new applications. [9] However, soft robotics and robogamis have historically developed separately, and studies on robogamis with soft matter were unavailable or quite limited even though their integration is expected to generate substantial achievements in terms of cost, fabrication, operation, and performance. Built-in folds made of soft materials have the considerable potential to yield continuum, compliant, and configurable properties for robots.In this work, we introduce a new approach to combine these two robotic techniques by using soft paper substrates and a waterresponsive origami technique. The capillary action of sprayed water molecules is constrained by hydrophilic channels on paper, whose number and size are carefully defined by double-sided printing and the asymmetrical penetration of wax. In particular, a bilayered single sheet of paper that uses wax and water can lead to programmed deformations from different swelling and shrinking properties of the layers. A wax-water pattern on paper develops a folding actuation with a specific degree and shape and unfolding with evaporation without being mechanically manipulated by external forces or moments. The 2D sheet of paper can be controllably self-folded into various 3D structures, demonstrating self-folding actuation, low-weight object manipulation, and biomimetic locomotion through bending and relaxation. Although a couple of paper-based robotic concepts were partly proposed before, [14,15] no technique has yet emerged as a simple print-and-fold actuator powered by environmental humidity or water for comprehensive robotic functions including self-folding, Soft robotics driven by origami can fundamentally advance robotic functionalities by significantly improving continuum, compliance, and configurability. Here, a new field is proposed, "paper robotics," which is based on moistureresponsive self-folding of paper substrates into functional 3D machines using origami-inspired techniques. By properly designing a hydrophobic wax layer and a hygro-expandable hydrophilic ...

show abstract

Section: Resultsmentioning

confidence: 99%

Paper Robotics: Self‐Folding, Gripping, and Locomotion

Ryu

Mohammadifar

Tahernia

et al. 2020

Adv Materials Technologies

View full text Add to dashboard Cite

show abstract

“…Then, drops are expelled suddenly from the setae, arising from the elastic deformation of setae array by growing drops (Figure f). Ultimately, condensed drops coalescence at the leg surface leads to a rapid anisotropic motion along the surface (Figure g) . Therefore, the self‐removal behavior of droplets on a very small scale will inspire the design of novel AF surfaces.…”

Section: Biological Antifogging Materialsmentioning

confidence: 99%

Flourishing Bioinspired Antifogging Materials with Superwettability: Progresses and Challenges

et al. 2018

View full text Add to dashboard Cite

Antifogging (AF) structure materials found in nature have great potential for enabling novel and emerging products and technologies to facilitate the daily life of human societies, attracting enormous research interests owing to their potential applications in display devices, traffics, agricultural greenhouse, food packaging, solar products, and other fields. The outstanding performance of biological AF surfaces encourages the rapid development and wide application of new AF materials. In fact, AF properties are inextricably associated with their surface superwettability. Generally, the superwettability of AF materials depends on a combination of their surface geometrical structures and surface chemical compositions. To explore their general design principles, recent progresses in the investigation of bioinspired AF materials are summarized herein. Recent developments of the mechanism, fabrication, and applications of bioinspired AF materials with superwettability are also a focus. This includes information on constructing superwetting AF materials based on designing the topographical structure and regulating the surface chemical composition. Finally, the remaining challenges and promising breakthroughs in this field are also briefly discussed.

show abstract

“…The continuous in situ observation shows that much more as‐coalesced droplets form on apexes of MCS array (Figure S1, Supporting Information). As reported, the surfaces of lotus leaf make the condensed droplets easily to be suspended up on the apex of papillae, due to cooperation between wettability gradient formation and multipapillea via coalescence of microdroplets (e.g., at low temperature and high humidity) . Similarly, water repellency can be seen on strider leg with setas.…”

mentioning

confidence: 72%

“…Figure S3 (Supporting Information) shows the sequence images of microdroplet coalescence to apex of single MCS. It is far different from that of normal spine where microdroplets are transported to the bottom (larger diameter) of cone spines . Figure a–c shows the sequent images of coalesced‐droplet transport on apexes on three MCSs with different apex angles of 30° (Figure a), 20° (Figure b), and 10° (Figure c) in the time of ≈18.42, ≈16.58, and ≈11.28 s, respectively.…”

mentioning

confidence: 81%

“…Biological surfaces arise the understanding and theories on wettability, e.g., cactus spines with droplet transport, bristles of strider leg for droplet repellency . The styles of microstructures to combine with surface energy (i.e., high surface energy for hydrophilic or low surface energy for hydrophobic) play the key role in controlling the behavior of droplet by means of unique solid–liquid interfaces . As for the model of hydrophilic cone spine, droplet seems to be transported easily on a hydrophilic geometric spine from small diameter (apex) to large diameter (bottom) due to differences of Laplace pressure for water harvesting .…”

mentioning

confidence: 99%

See 1 more Smart Citation