Absorption and desorption of organic liquids in elastic superhydrophobic silica aerogels

Rao, A. Venkateswara; Hegde, Nagaraja D.; Hirashima, Hiroshi

doi:10.1016/j.jcis.2006.09.025

Cited by 234 publications

(37 citation statements)

References 14 publications

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“…The methods to prepare hydrophobic silica aerogels were intensively studied by many authors (Schwertfeger et al [56], Schuth et al [114], Venkateswara Rao et al [115][116][117][118][119], Lee et al [14], Kim and Hyun [120], Shi et al [121], and Hwang et al [12]). Good reviews of the methods to synthesize such materials and of the characteristics achieved are presented in Chaps.…”

Section: Chemical Characteristicsmentioning

confidence: 99%

“…With 20% (by mass) PDMS, they can be elastically compressed to 30% (by volume) with no damage [158]. Some flexible silica aerogels with superhydrophobic properties were also made from MTMS by A. Venkateswara Rao et al [116]. At last, polymeric crosslinking of the silica skeleton can also permit to drastically increase the initial mechanical characteristics [159].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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SiO2 Aerogels

Pierre

Rigacci

2011

Aerogels Handbook

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International audienceThis chapter focuses on one of the most studied aerogel materials, silica aerogels. It aims at presenting a brief overview of the elaboration steps (sol-gel synthesis, aging, and drying), the textural and chemical characteristics (aggregation features, porosity, and surface chemistry), the main physical properties (from thermal, mechanical, acoustical, and optical, to biological, medical, etc.), and a rather broad panel of related potential applications of these fascinating nanostructured materials. It cannot be considered as an exhaustive synopsis but must be used as a simple tool to initiate further bibliographic studies on silica aerogels

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Section: Chemical Characteristicsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

SiO2 Aerogels

Pierre

Rigacci

2011

Aerogels Handbook

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“…More recently, new techniques incorporating aerogels89, magnetic materials101112, and fluorosurfactant polymers13 have been introduced. Though promising, these approaches are ineffective for separation of small-scale emulsions, especially for those with droplets below a micron in size7141516.…”

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confidence: 99%

Separating Oil-Water Nanoemulsions using Flux-Enhanced Hierarchical Membranes

Solomon

Hyder

Varanasi

2014

Sci Rep

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Membranes that separate oil-water mixtures based on contrasting wetting properties have recently received significant attention. Separation of nanoemulsions, i.e. oil-water mixtures containing sub-micron droplets, still remains a key challenge. Tradeoffs between geometric constraints, high breakthrough pressure for selectivity, high flux, and mechanical durability make it challenging to design effective membranes. In this paper, we fabricate a hierarchical membrane by the phase inversion process that consists of a nanoporous separation skin layer supported by an integrated microporous layer. We demonstrate the separation of water-in-oil emulsions well below 1 μm in size. In addition, we tune the parameters of the hierarchical membrane fabrication to control the skin layer thickness and increase the total flux by a factor of four. These simple yet robust hierarchical membranes with engineered wetting characteristics show promise for large-scale, efficient separation systems.

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“…What makes the AKD-RESS method advantageous to other proposed methods for creating superhydrophobic surfaces using supercritical technique, Jagannathan and Mehta (2006), Yoshida and Nagakubo (2007), Gallyamov et al (2007), Venkateswara Rao et al (2006) is the combination of the one-step approach, the absence of organic solvents, and the possibility to turn the treatment into a continuous process.…”

Section: Influence Of the Different Preparation Methodsmentioning

confidence: 99%

Properties of superhydrophobic paper treated with rapid expansion of supercritical CO2 containing a crystallizing wax

et al. 2009

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Paper samples were rendered superhydrophobic with Alkyl Ketene Dimer using (1) Airblasting with cryo ground micro particles, (2) crystallizing from organic solvents and (3) spraying with Rapid Expansion of Supercritical Solutions (RESS) technique. The papers were characterized using Scanning Electron Microscopy, contact angle to water measurements and X-ray Photoelectron Spectroscopy (XPS). Advancing contact angles were in the region of 150°-160°and receding contact angles were in the region of 110°-130°. Diagrams showing the drop base diameter vs. the contact angle when water is pumped into, and then withdrawn from, a sessile drop show that a stick slip pattern is present in the advancing phase for a non coated internally sized paper. Papers rendered superhydrophobic with the RESS technique showed a much less pronounced stick slip pattern in the advancing phase but still a stick slip pattern in the receding phase.

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Absorption and desorption of organic liquids in elastic superhydrophobic silica aerogels

Cited by 234 publications

References 14 publications

SiO2 Aerogels

SiO2 Aerogels

Separating Oil-Water Nanoemulsions using Flux-Enhanced Hierarchical Membranes

Properties of superhydrophobic paper treated with rapid expansion of supercritical CO2 containing a crystallizing wax

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