Experimental study on directional motion of a single droplet on cactus spines

Guo, Lin; Tang, G.H.

doi:10.1016/j.ijheatmasstransfer.2014.12.072

Cited by 35 publications

(27 citation statements)

References 29 publications

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“…Mussel thread ( Ceylan et al., 2013 ) can withstand ten gale of winds in air and have strong adhesion and self-healing capability under seawater. Spider silk ( Chen and Guo, 2019 ; Chen and Zheng, 2014 ; Zheng et al., 2010 ) and cactus ( Guo and Tang, 2015 ; Heng et al., 2014 ; Kim et al., 2017 ; Ju et al., 2012 ) have effective water-collecting capabilities in arid conditions. One common observation is that they all have multifunctional and diverse material structures.…”

Section: Introductionmentioning

confidence: 99%

Progress in Bioinspired Dry and Wet Gradient Materials from Design Principles to Engineering Applications

Dong

Hong

et al. 2020

iScience

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Summary Nature does nothing in vain. Through millions of years of revolution, living organisms have evolved hierarchical and anisotropic structures to maximize their survival in complex and dynamic environments. Many of these structures are intrinsically heterogeneous and often with functional gradient distributions. Understanding the convergent and divergent gradient designs in the natural material systems may lead to a new paradigm shift in the development of next-generation high-performance bio-/nano-materials and devices that are critically needed in energy, environmental remediation, and biomedical fields. Herein, we review the basic design principles and highlight some of the prominent examples of gradient biological materials/structures discovered over the past few decades. Interestingly, despite the anisotropic features in one direction (i.e., in terms of gradient compositions and properties), these natural structures retain certain levels of symmetry, including point symmetry, axial symmetry, mirror symmetry, and 3D symmetry. We further demonstrate the state-of-the-art fabrication techniques and procedures in making the biomimetic counterparts. Some prototypes showcase optimized properties surpassing those seen in the biological model systems. Finally, we summarize the latest applications of these synthetic functional gradient materials and structures in robotics, biomedical, energy, and environmental fields, along with their future perspectives. This review may stimulate scientists, engineers, and inventors to explore this emerging and disruptive research methodology and endeavors.

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Section: Introductionmentioning

confidence: 99%

Progress in Bioinspired Dry and Wet Gradient Materials from Design Principles to Engineering Applications

Dong

Hong

et al. 2020

iScience

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“…In the previous studies on spine structures, fog droplets move to the base of spine due to the gradient of Laplace pressure, and get collected by the hydrophilic substrate. 20 In our study, we have modied the spine with two wetting properties. The fog droplets easily fall off from the spine.…”

Section: Introductionmentioning

confidence: 99%

Fog collection on a superhydrophobic/hydrophilic composite spine surface

Wang

Zhao

et al. 2020

RSC Adv.

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Inspired by numerous plants and animals living in arid conditions, a composite surface with the fog collection capacity has been fabricated in this study. The surface is composed of polydimethylsiloxanebased spine-arrays and a ZnO micron structure. Two wetting properties are integrated on the surface of the spine structure; the tip of spine is processed as hydrophilic and other parts such as the root region of spine and the base are processed as superhydrophobic. When the surface is in the saturated fog flow with a specific tilt angle, the fog deposits on spines and forms condensed droplets; then, the droplets fall off the surface due to gravity. Further, a new cycle of fog collection begins. In this study, we find that the percentage of the hydrophilic tip in the overall spine structure length, the distance between two spines and the tilt angle of surface are the key factors for improving the efficiency of fog collection. Such a composite surface might be an ideal platform for fog collection from air. rsc.li/rsc-advances9318 | RSC Adv., 2020, 10, 9318-9323This journal is

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“…Certain cacti possess conical spines and trichomes with a hydrophilic surface and hierarchical grooves such that water droplets can be efficiently transported by the Laplace pressure and wettability gradient. 21,22 All the abovementioned examples have one thing in common: a hydrophilic surface. It has been reported that a hydrophilic surface ensures a higher nucleation process than the hydrophobic surface.…”

Section: Introductionmentioning

confidence: 99%