Superhydrophobic silica aerogel powders with simultaneous surface modification, solvent exchange and sodium ion removal from hydrogels

Bhagat, Sharad D.; Kim, Yong-Ha; Suh, Kuen-Hack; Ahn, Young-Soo; Yeo, Jeong-Gu; Han, Jung-Geun

doi:10.1016/j.micromeso.2007.10.030

Cited by 130 publications

(59 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent studies, however, have shown that there are alternative methods for engineering affordable superhydrophobic surfaces. One can produce a superhydrophobic surface by randomly depositing hydrophobic aerogel particles on a substrate [59][60][61]. Samaha et al [62] prepared aerogel superhydrophobic surfaces with different particle sizes.…”

Section: Engineered Cost-effective Surfacesmentioning

confidence: 99%

Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

View full text Add to dashboard Cite

Abstract:We review recent developments in nature-inspired superhydrophobic and omniphobic surfaces. Water droplets beading on a surface at significantly high static contact angles and low contact-angle hystereses characterize superhydrophobicity. Microscopically, rough hydrophobic surfaces could entrap air in their pores resulting in a portion of a submerged surface with air-water interface, which is responsible for the slip effect. Suberhydrophobicity enhances the mobility of droplets on lotus leaves for self-cleaning purposes, so-called lotus effect. Amongst other applications, superhydrophobicity could be used to design slippery surfaces with minimal skin-friction drag for energy conservation. Another kind of slippery coatings is the recently invented slippery liquid-infused porous surfaces (SLIPS), which are one type of omniphobic surfaces. Certain plants such as the carnivorous Nepenthes pitcher inspired SLIPS. Their interior surfaces have microstructural roughness, which can lock in place an infused lubricating liquid. The lubricant is then utilized as a repellent surface for other liquids such as water, blood, crude oil, and alcohol. In this review, we discuss the concepts of both lotus effect and Nepenthes slippery mechanism. We then present a review of recent advances in manufacturing polymeric and non-polymeric slippery surfaces with ordered and disordered micro/nanostructures. Furthermore, we discuss the performance and longevity of such surfaces. Techniques used to characterize the surfaces are also detailed. We conclude the article with an overview of the latest advances in characterizing and using slippery surfaces for different applications.

show abstract

Section: Engineered Cost-effective Surfacesmentioning

confidence: 99%

Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

View full text Add to dashboard Cite

show abstract

“…Silica nanoparticles, as important inorganic materials, have emerged as an area of intense interest because of their special physical and chemical properties, such as their small size, strong surface energy, high scattered performance, and thermal resistance (Ouabbas, 2009;Bhagat, 2008;Oh, 2009;Xue, 2009). However, the applications of silica nanoparticles are largely limited because of their highly energetic hydrophilic surface, which causes the silica nanoparticles to easily agglomerate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterisation of Silica/Polyamide-Imide Composite Film for Enamel Wire

Ma¹,

Kim²

2012

Scanning Electron Microscopy

View full text Add to dashboard Cite

“…However, supercritical drying process is so costly and risky that real practicality and commercialization are difficult. Thus, in recent years, synthesizing silica aerogels by an ambient pressure drying technique has been attracting considerable attention [21][22][23][24][25][26]. Our previous research indicated that silica aerogels could be successfully synthesized via ambient pressure process, by one-step solvent exchange/surface modification of the wet gel using trimethylchlorosilane (TMCS)/ ethanol(EtOH)/hexane mixed solution before drying [26].…”

Section: Introductionmentioning

confidence: 99%