Sol-Gel Science

Brinker, C.J.

doi:10.1016/c2009-0-22386-5

Cited by 706 publications

(37 citation statements)

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“…The basic steps of the process are explicitly hydrolysis whereby the chemical bonds of precursors are deteriorated by water to form gel continued by condensation for genesis of sols in the liquid. In the end, the leftover liquid is drained to finalize the morphology of NMs [55,68]. Owing to few flaws such as low abrasion resistance, poor bonding, exalted permeability and difficult control over porosity of technique, it becomes difficult to realize its industrial scale up [69].…”

Section: Chemical Methodsmentioning

confidence: 99%

Optimization of Biogenic Synthesis of Colloidal Metal Nanoparticles

Moholkar¹,

Havaldar²,

Potadar³

et al. 2021

Colloids - Types, Preparation and Applications

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Nanotechnology which deals with the synthesis and characterization of dispersed or solid particles in nano-metric range has emerged out to be a novel approach due to its ample applications in biomedical fields. The advancements in the field of nanotechnology and substantial evidences in biomedical applications have led the researchers to explore safe, ecofriendly, rapid and sustainable approaches for the synthesis of colloidal metal nanoparticles. This chapter illustrates superiority of biogenic route of synthesis of nanoparticles over the different approaches such as chemical and physical methods. In biogenic route, plants and microorganisms like algae, fungi, yeast, actinomycetes etc. act as “bio-factories” which reduce the metal precursors and play a crucial role in the synthesis of nanoparticles with distinct morphologies. Thus, the need of hazardous chemicals is eliminated and a safer and greener approach of nanoparticles synthesis can be adopted. This chapter also outlines the effect of optimization of different parameters mainly pH, temperature, time and concentration of metal ions on the nanoparticle synthesis. It is evident that the optimization of various parameters can yield nanoparticles with desired properties suitable for respective biomedical applications.

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Section: Chemical Methodsmentioning

confidence: 99%

Optimization of Biogenic Synthesis of Colloidal Metal Nanoparticles

Moholkar¹,

Havaldar²,

Potadar³

et al. 2021

Colloids - Types, Preparation and Applications

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show abstract

“…The thin-film fabrication of titania from sol solutions on various substrates via the ESD process has been reported by several researchers [17,28,29]. In the case of the sol solution approach, the metal compounds used are generally unstable due to hydrolysis and polycondensation near room temperature, giving rise to a solution wherein polymers or colloidal particles involving metallic species are dispersed without precipitation.…”

Section: Homogeneous Coating Of Titania Thin Films Via Esd Processmentioning

confidence: 99%

“…In the case of the sol solution approach, the metal compounds used are generally unstable due to hydrolysis and polycondensation near room temperature, giving rise to a solution wherein polymers or colloidal particles involving metallic species are dispersed without precipitation. Further reaction connects the fine particles, thereby solidifying the sol into a wet gel, which still contains water and solvents [29].…”

Section: Homogeneous Coating Of Titania Thin Films Via Esd Processmentioning

confidence: 99%

Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

et al. 2020

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Titania precursor films were electrosprayed on a quartz glass substrate, which was pre-modified with an ultra-thin film obtained by spin-coating a single-walled carbon nanotube (SWCNT) dispersed solution. The X-ray diffraction patterns of the thin films obtained by heat-treating the precursor films at 500 °C in air for 1 h indicated that the formed crystals were anatase. A new route to fabricate transparent thin films on the insulating substrate via electrospray deposition (ESD) was thus attained. The photoluminescence spectrum of the thin film showed a peak at 2.23 eV, assignable to the self-trapped exciton of anatase. The Raman spectrum of the thin film demonstrated that heat treatment is useful for removing SWCNTs. The thin film showed a water contact angle of 14 ± 2° even after being kept under dark conditions for 1 h, indicating a high level of hydrophilicity. Additionally, the thin film had a super-hydrophilic surface with a water contact angle of 1 ± 1° after ultraviolet light irradiation with an intensity of 4.5 mW cm–2 at 365 nm for 1 h. The importance of Ti3+ ions in the co-present amorphous phase, which was dominantly formed via the ESD process, for hydrophilicity was also clarified by means of X-ray photoelectron spectroscopy.

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“…This large class of materials includes silica gels, aerogels, precipitated silica powders, pyrogenic silica, ordered mesoporous silicas and aluminosilicates, silicas and aluminosilicates with hierarchical porosity, silica nanoparticles with different pores, morphologies and sizes, periodic mesoporous organosilicas [127,128,129,130,131,132,133].…”

Section: Presentation Of Adsorbent Candidates For Adsorption-basedmentioning

confidence: 99%

A Critical Review of Solid Materials for Low-Temperature Thermochemical Storage of Solar Energy Based on Solid-Vapour Adsorption in View of Space Heating Uses

Salles

Zając

2019

Molecules

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The present report deals with low-temperature thermochemical storage for space heating, which is based on the principles of vapour adsorption onto solid adsorbents. With the aim of obtaining comprehensive information on the rationalized selection of adsorbents for heat storage in open sorption systems operating in the moist-air flow mode, various materials reported up to now in the literature are reviewed by referring strictly to the possible mechanisms of water vapour adsorption, as well as practical aspects of their preparation or their application under particular operating conditions. It seems reasonable to suggest that, on the basis of the current state-of-the-art, the adsorption phenomenon may be rather exploited in the auxiliary heating systems, which provide additional heat during winter’s coldest days.

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Sol-Gel Science

Cited by 706 publications

References 0 publications

Optimization of Biogenic Synthesis of Colloidal Metal Nanoparticles

Optimization of Biogenic Synthesis of Colloidal Metal Nanoparticles

Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

A Critical Review of Solid Materials for Low-Temperature Thermochemical Storage of Solar Energy Based on Solid-Vapour Adsorption in View of Space Heating Uses

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