Biomimicked Superhydrophobic Polymeric and Carbon Surfaces

Sharma, Chandra Sekhar; Kumar, Abhishek; Katepalli, Hari; Sharma, Ashutosh

doi:10.1021/ie300772p

Cited by 4 publications

(11 citation statements)

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“…3 In particular, biomimetics involves the formation of functional surfaces inspired, adapted, or derived from nature 13 and allows us to produce positive 14 or negative 15,16 copies of the micro-or nanoscale topographies existing in living organisms. In particular, anisotropic wetting phenomena are widely observed in natural surfaces.…”

Section: ■ Introductionmentioning

confidence: 99%

Strelitzia reginae Leaf as a Natural Template for Anisotropic Wetting and Superhydrophobicity

Mele

Girardo²,

Pisignano³

2012

Langmuir

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Artificial surfaces that exhibit unidirectional water spreading and superhydrophobicity are obtained by Strelitzia reginae leaves. Both green and dried leaves are used, thus exploiting the plant senescence. We demonstrate that the natural drying process of the leaves strongly affects the surface morphology and wettability. Polymeric stamps from the green leaf show an arrangement of periodic microridges/microgrooves that favor anisotropic wetting, with a water contact angle (WCA) variation of about 21% along the two principal directions. Instead, the shrinkage of the leaf tissue, as a consequence of the natural dehydration process, induces an enhancement of the superficial corrugation. This results in the establishment of a superhydrophobic state, which shows a WCA of up to 160°, and water rolling off. S. reginae leaves are therefore easily accessible stamps suitable for controlling wettability and realizing surfaces that exhibit various wetting behaviors.

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Section: ■ Introductionmentioning

confidence: 99%

Strelitzia reginae Leaf as a Natural Template for Anisotropic Wetting and Superhydrophobicity

Mele

Girardo²,

Pisignano³

2012

Langmuir

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“…[1][2][3][4] It is found in the recent literature that several indole derivatives are reported to possess a wide variety of biological properties, e.g. CNS depressant, 5 anti-inflammatory and analgesic, 6 antiviral, 7 anthelmintic, 8 antibacterial, 9 anticonvulsant, 10 cardiovascular, 11 and antihypertensive activity. 12 In recent years, 1,4-diazabicyclo[2.2.2]octane (DABCO) has emerged as a promoter for various organic reactions.…”

Section: Introductionmentioning

confidence: 99%

A facile one-pot synthesis of novel 1-substituted 2-(8-hydroxyquinolin-5-yl)-1,5,6,7-tetrahydro-6,6-dimethyl- 4H-indol-4-one derivatives

Abdel‐Mohsen¹,

El‐Emary²

2016

Arkivoc

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“…1,2,4,[6][7][8][9][10][11][12][13][14][15][16][17] Since the 'Lotus effect' 18,19 has been observed and explained in late 1990s, nature has been a continuous source of inspiration in the fabrication of superhydrophobic surfaces. [20][21][22][23][24][25][26][27][28][29][30][31][32][33] Although a number of techniques, such as electrospinning, 1,7,8,12,14 etching, [9][10][11][12]14 electrodeposition, 11,12 chemical vapor deposition, 12 sol-gel emulsion, 12,15 lithography 12,14,16 and self-organization, 17 a...…”

Section: Introductionmentioning

confidence: 99%

“…However, to the best of the knowledge, there are only a few reports of mimicking the plant surfaces with high-aspect-ratio patterns except hairy surface leaves. 27,28 In this study, C. indica, a garden plant belonging to Cannaceae family, has been chosen as a model plant. As mentioned above, Biomimicked high-aspect-ratio hierarchical superhydrophobic polymer surfaces Mattaparthi and Sharma C. indica leaf 12,32 shows superhydrophobicity and so also its seedpod.…”

Section: Introductionmentioning

confidence: 99%

“…The authors used C. indica seedpod as a template to successfully replicate its high-aspect-ratio hierarchical structures first into an elastomer, poly(dimethylsiloxane) (PDMS), using replica molding 35 followed by preparing a positive replica into an organic resorcinolformaldehyde (RF) xerogel. Since RF xerogel is a polymer precursor to glassy carbon, 28 these high-aspect-ratio hierarchical, biomimicked polymer structures could be converted into 3D glassy carbon structures on pyrolysis to enable their use in carbon-based microelectromechanical systems (C-MEMS). The authors later studied the wettability characteristics of these high-aspect-ratio hierarchical biomimicked polymer surfaces, which also exhibited superhydrophobicity similar to their original counterpart.…”

Section: Introductionmentioning

confidence: 99%

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Biomimicked high-aspect-ratio hierarchical superhydrophobic polymer surfaces

Mattaparthi

Sharma

2014

Bioinspired, Biomimetic and Nanobiomaterials

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There is an abundance of plant surfaces in nature, which inspires scientific community to replicate and prepare artificial superhydrophobic surfaces. However, most of these studies are limited to low-aspect-ratio structures as found in petals and leaves. In this study, the authors chose Canna indica, a garden plant belonging to Cannaceae family, as a model plant. The C. indica seedpods possess high-aspect-ratio multiscale structures and also show superhydrophobic behavior. These high-aspect-ratio hierarchical structures as found in C. Indica seedpod were then successfully replicated by replica molding in different polymers such as poly(dimethylsiloxane) (PDMS) and resorcinol-formaldehyde (RF)based xerogel. These biomimicked polymer surfaces exhibit superhydrophobicity as confirmed by water contact angle measurement. The original seedpod shows water contact angle of 151°, while negative PDMS and RF gel replica with high-aspect-ratio structural patterns show water contact angle of 146 and 155°, respectively. Thus, the biomimetic approach depicted here not only allows the facile fabrication of high-aspect-ratio structures over a large area but also provides a low-cost alternative to produce superhydrophobic polymer surfaces. Bioinspired, Biomimetic and Nanobiomaterials Volume 3 Issue BBN1 Biomimicked high-aspect-ratio hierarchical superhydrophobic polymer surfaces Mattaparthi and Sharma Pages 4-9

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Biomimicked Superhydrophobic Polymeric and Carbon Surfaces

Cited by 4 publications

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Strelitzia reginae Leaf as a Natural Template for Anisotropic Wetting and Superhydrophobicity

Strelitzia reginae Leaf as a Natural Template for Anisotropic Wetting and Superhydrophobicity

A facile one-pot synthesis of novel 1-substituted 2-(8-hydroxyquinolin-5-yl)-1,5,6,7-tetrahydro-6,6-dimethyl- 4H-indol-4-one derivatives

Biomimicked high-aspect-ratio hierarchical superhydrophobic polymer surfaces

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