Aerogels Synthesis by Sonocatalysis: Sonogels

Esquivias, L.; Piñero, Manuel; Morales‐Flórez, Víctor; Rosa–Fox, N. de la

doi:10.1007/978-1-4419-7589-8_20

Cited by 15 publications

(9 citation statements)

References 70 publications

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“…In addition, the porosity was calculated following Equation (3):

where

is the bulk density and

is the density of a silica matrix. (2.09 g cm −3 ) [ 49 ]. The corresponding porosity values ranged from 81.9% to 91.6% for CS1G0 and CS4G0 samples, respectively, and are presented in Table 2 , together with the most relevant values of the structural parameters.…”

Section: Resultsmentioning

confidence: 99%

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Chitosan-GPTMS-Silica Hybrid Mesoporous Aerogels for Bone Tissue Engineering

et al. 2020

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This study introduces a new synthesis route for obtaining homogeneous chitosan (CS)-silica hybrid aerogels with CS contents up to 10 wt%, using 3-glycidoxypropyl trimethoxysilane (GPTMS) as coupling agent, for tissue engineering applications. Aerogels were obtained using the sol-gel process followed by CO2 supercritical drying, resulting in samples with bulk densities ranging from 0.17 g/cm3 to 0.38 g/cm3. The textural analysis by N2-physisorption revealed an interconnected mesopore network with decreasing specific surface areas (1230–700 m2/g) and pore sizes (11.1–8.7 nm) by increasing GPTMS content (2–4 molar ratio GPTMS:CS monomer). In addition, samples exhibited extremely fast swelling by spontaneous capillary imbibition in PBS solution, presenting swelling capacities from 1.75 to 3.75. The formation of a covalent crosslinked hybrid structure was suggested by FTIR and confirmed by an increase of four hundred fold or more in the compressive strength up to 96 MPa. Instead, samples synthesized without GPTMS fractured at only 0.10–0.26 MPa, revealing a week structure consisted in interpenetrated polymer networks. The aerogels presented bioactivity in simulated body fluid (SBF), as confirmed by the in vitro formation of hydroxyapatite (HAp) layer with crystal size of approximately 2 µm size in diameter. In vitro studies revealed also non cytotoxic effect on HOB® osteoblasts and also a mechanosensitive response. Additionally, control cells grown on glass developed scarce or no stress fibers, while cells grown on hybrid samples showed a significant (p < 0.05) increase in well-developed stress fibers and mature focal adhesion complexes.

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“…In addition, the porosity was calculated following Equation (3):

where

is the bulk density and

Section: Resultsmentioning

confidence: 99%

“…where ρ bulk is the bulk density and ρ skeleton is the density of a silica matrix. (2.09 g cm −3 ) [49].…”

Section: Bulk Density and Textural Propertiesmentioning

confidence: 92%

Chitosan-GPTMS-Silica Hybrid Mesoporous Aerogels for Bone Tissue Engineering

et al. 2020

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“…The effect of ultrasound on chemical reaction in the sol-gel process is mainly due to acoustic cavitation, which includes three discrete stages: nucleation, bubble growth, and implosive collapse. If ultrasound wave is used, rapid compression of gas during cavitational collapse leads to nearly adiabatic heating due to slow thermal transport, thereby forming localized hotspot and bond cleavage or rearrangement cause, followed by atomic and radical recombination and thermal and chemical quenching [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Irradiation on Preparation and Properties of Ionogels

Singh

2012

Journal of Nanomaterials

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Silica-gel matrices containing ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate viz. ionogels have been synthesized using one-pot nonhydrolytic sol-gel method and taking tetraethyl orthosilicate (TEOS) as starting precursor. Effect of ultrasonic irradiation on pore parameters of ionogels and vibrational properties of the IL upon confinement in the porous matrix has been investigated. The synthesized gels have been characterized by BET, DSC, TGA, and FTIR. BET analysis shows some changes in the pore parameters due to ultrasonic irradiation. DSC results indicate shift in glass transition temperature upon confinement of the IL. The FTIR spectra show changes in vibrational bands on confinement, particularly, the bands related to the imidazolium ring; aliphatic chain and anionPF6 −of the IL are found to shift upon confinement in porous silica matrix obtained due to ultrasonic irradiation. Ultrasonic irradiation has been found to affect the gelation dynamics and kinetics and pore parameters.

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“…The drying process in this approach is performed at ambient pressure; as a result, this method is much safer and less expensive. When wet gels are dried under ambient temperature and pressure, the resulting materials have higher density and are referred to as "xerogels" (Esquivias, Pinero, Morales Florez, & Rosa Fox, 2011).…”

Section: Gel Dryingmentioning

confidence: 99%

Hygrothermal Analysis and Prediction of Long-Term Thermal Performance of Aerogel-Enhanced Superinsulation Products

Nosrati¹

2023

Preprint

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Aerogel-enhanced insulating materials provide significantly higher thermal resistance per unit of thickness compared to conventional insulating materials. These superinsulation materials are relatively new in the construction industry, and their thermal properties under different hygric conditions and their durability are still unknown. In this study, the main characteristics of a variety of aerogel-based materials under different climatic conditions were studied. Furthermore, the samples underwent accelerated aging tests, and the impact of aging on the thermal performance of aerogel-based products was investigated. The results showed that the thermal properties of aerogel-based products are affected by moisture content and their thermal resistance degraded under extreme humidity conditions. The analysis of the aging effects showed that aerogel-based products would maintain their superior thermal performance over time. The average increase in the thermal conductivity (compared to the pristine condition) was below 10% after the equivalent of twenty years of aging under various climatic factors.

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Aerogels Synthesis by Sonocatalysis: Sonogels

Cited by 15 publications

References 70 publications

Chitosan-GPTMS-Silica Hybrid Mesoporous Aerogels for Bone Tissue Engineering

Chitosan-GPTMS-Silica Hybrid Mesoporous Aerogels for Bone Tissue Engineering

Effect of Ultrasonic Irradiation on Preparation and Properties of Ionogels

Hygrothermal Analysis and Prediction of Long-Term Thermal Performance of Aerogel-Enhanced Superinsulation Products

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