Surface modified sodium silicate based superhydrophobic silica aerogels prepared via ambient pressure drying process

Khedkar, Mangesh V.; Somvanshi, Sandeep B.; Humbe, Ashok V.; Jadhav, K. M.

doi:10.1016/j.jnoncrysol.2019.02.004

Cited by 120 publications

(36 citation statements)

References 35 publications

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“…Morphology and the compositional investigation of the prepared sample was examined by utilizing field emission scanning electron microscope (FE-SEM) JEOL-JSM 840 model at working voltage of 20 kV joined with EDX machine. Brunauer-Emmett-Teller (Quantachrome Instruments v 5.2) examination was utilized to decide the pore span and the particular surfaces territory of the zinc ferrite nanoparticles [58]. The arrangement of spinel structure were recognized by utilizing Fourier Transform Infrared Spectroscopy (FTIR) (Bruker Germany, Vertex 70 show) in the scope of 400 cm −1 to 4000 cm −1 .…”

Section: Characterizations Of Zinc Ferrite Nanoparticles (Catalyst)mentioning

confidence: 99%

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Borade

Somvanshi

Kale³

et al. 2020

Mater. Res. Express

120

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A profoundly effective magnetically recoverable nano zinc ferrite nanocatalyst was fabricated by means of sol-gel auto ignition strategy. The synthesized nanocatalyst has been completely portrayed by standard techniques for structural, morphological, compositional, surface, magnetic, dielectric, optical and photoluminescence properties individually. The x-ray diffraction pattern affirmed the arrangement of cubic spinel structure with an average crystallite size of 21 nm. FE-SEM images uncovered the circular morphology with nanometric average grain measure (37 nm). The surface area, pore volume and pore radius was observed to be 39.812 m 2 g −1 , 3.41 cc g −1 and 1.34 nm individually from BET analysis. VSM investigation demonstrated the superparamgnetic nature of the prepared sample with moderate magnetization value and negligible coercivity. The optical band gap deduced from UV-vis spectra was observed to be 2.098 eV. Every one of these properties of zinc nanoferrite makes them brilliant contender for microwave radiation absorption. Further, a proficient and versatile microwave irradiated solvent free synthesis of chalcone derivatives has been developed using prepared zinc nanoferrite catalyst. The remarkable highlights of this new protocol are solvent free reaction, economical cheapness, eco-friendliness, high yields, reduced reaction times and easy recovery and reuse of zinc ferrite nanocatalyst.

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Section: Characterizations Of Zinc Ferrite Nanoparticles (Catalyst)mentioning

confidence: 99%

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Borade

Somvanshi

Kale³

et al. 2020

Mater. Res. Express

120

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“…As is clear, no sharp peak was observed in XRD profiles. The major broad diffraction peaks at 2θ = 23 in SA1 sample was well corresponding to JCPDS PDF data (29-0085) related to silica amorphous phase 34. The appeared diffraction peak at 2θ = 20 in PVA-ip-SiO 2 network diffractogram is attributed to the (101) plane reflection of the PVA crystals based on JCPDS PDF data 31.…”

supporting

confidence: 73%

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Bananifard

Ashjari

Niazi

et al. 2020

Polymers for Advanced Techs

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Silica aerogel as an ultra-porous material with high specific surface area is fabricated through drying a wet gel. Although ambient pressure drying is considered as simplest method, the obtained physical properties are not very desired. Here, we introduced a novel approach to improve the efficiency of ambient pressure drying technique by enhancing the strength and firmness of pores walls. The tetraethyl orthosilicate was used to produce the wet gel. The gel network was reinforced via embedding the polyvinyl alcohol cross-linkable polymer into porosities of wet gel, and drying at ambient condition, forming an interpenetrating network. The thermal treatment was applied to remove the polymeric phase from structure of reinforced network. A proper specific surface area, good density, and high porosity were achieved about 503 m 2 /g, 0.23 g/cm 3 , and 89%, respectively. Furthermore, the obtained interconnected structure along whit large numbers of open mesopores confirms the acceptable efficiency of introduced facilitated technique.

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“…Moreover, the peak at around 1400 cm −1 was assigned to the N–H bonding as well as possibly to the vibration of CH 2 group due to the modification using HMDS [ 25 ]. The asymmetric vibration peak at 1100 cm −1 in all samples indicated the vibrations of Si–O–Si bonding [ 25 , 26 ].…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Coating Derived from Geothermal Silica to Enhance Material Durability of Bamboo Using Hexadimethylsilazane (HMDS) and Trimethylchlorosilane (TMCS)

et al. 2021

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Bamboo, a fast-growing plant from Asia, is used as building material with unique properties, while exhibiting fast degradation due to its hydrophobicity. Therefore, many attempts have been implemented using several technologies for bamboo modification to alter the hydrophobicity. Most previous studies producing superhydrophobic properties are conducted by using tetraethoxysilane (TEOS) as a precursor agent. However, this method, using TEOS with harmful properties and unaffordable compounds, requires many steps to accomplish the experimental method. Therefore, this paper employed geothermal solid waste as a silica source of the precursor. Thus, an effective and efficient method was applied to prepare superhydrophobic coating by using a precursor of geothermal silica and further modification using hexamethyldisilazane (HMDS) and trimethylchlorosilane (TMCS). The research was executed by the full factorial statistical method using two numerical variables (HMDS/TMCS concentration and silica concentration) and one categorical variable (solvent types). The uncoated material revealed higher weight gain in mass and moisture content than that of the coated bamboo after the soil burial test to assess the durability of the bamboo. However, the durability of superhydrophobic coating realized hydrophobic performance for both agents during sand abrasion for a total of 120 s at an angle of 45°. Statistical results showed the optimum contact angle (CA) achieved in superhydrophobic performance with lower silica concentration for HMDS concentration and the appropriate solvent of n-hexane for HMDS and iso-octane for TMCS. All results were supported using many instruments of analysis to confirm the step-by-step alteration of geothermal silica to be used as a superhydrophobic coating, such as XRF, XRD, FTIR, SEM, and SEM EDX.

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Surface modified sodium silicate based superhydrophobic silica aerogels prepared via ambient pressure drying process

Cited by 120 publications

References 35 publications

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Spinel zinc ferrite nanoparticles: an active nanocatalyst for microwave irradiated solvent free synthesis of chalcones

Efficient reinforcement of wet gel by embedded polymer as newly approach for silica aerogel

Superhydrophobic Coating Derived from Geothermal Silica to Enhance Material Durability of Bamboo Using Hexadimethylsilazane (HMDS) and Trimethylchlorosilane (TMCS)

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