Microstructure and Adsorption Properties of MTMS / TEOS Co-precursor Silica Aerogels Dried at Ambient Pressure

Yao, Chao; Dong, Xin; Gao, Guangpeng; Sha, Fei; Xu, Da

doi:10.1016/j.jnoncrysol.2021.120778

Cited by 28 publications

(15 citation statements)

References 24 publications

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“…The SEM images demonstrate that the PSAM and HSAM showed a nanoporous network constructed by colloidal particles and nanopores, which is the same as the typical silica aerogels [ 3 , 44 , 45 ]. The graft of the Si-CH 3 species leads to the decrease in large voids, and the microscopic morphology of the HSAM is similar with the reported hydrophobic silica aerogels [ 9 , 11 , 46 , 47 ]. However, the RSAM with polymer cross-linking showed a network with agglomerations, of which the particles were connected to each other as HDI-derived polyurea coated on the framework [ 33 ].…”

Section: Resultssupporting

confidence: 80%

See 1 more Smart Citation

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Sun

Zhao

Kong

et al. 2022

Gels

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An efficient auto-continuous globing process was developed with a self-built apparatus to synthesize pure silica aerogel microspheres (PSAMs) using sodium silicate as a precursor and water as a solvent. A hydrophobic silica aerogel microsphere (HSAM) was obtained by methyl grafting. A reinforced silica aerogel microsphere (RSAM) was prepared by polymer cross-linking on the framework of the silica gel. The pH value of the reaction system and the temperature of the coagulating bath were critical to form perfect SAMs with a diameter of 3.0 ± 0.2 mm. The grafted methyl groups are thermally stable up to 400 °C. Polymer cross-linking increased the strength significantly, owing to the polymer coating on the framework of silica aerogel. The pore volumes of HSAM (6.44 cm3/g) and RSAM (3.17 cm3/g) were much higher than their state-of-the-art counterparts. Their specific surface areas were also at a high level. The HSAM and RSAM showed high organic sorption capacities, i.e., 17.9 g/g of pump oil, 11.8 g/g of hexane, and 22.2 mg/g of 10 mg/L methyl orange. The novel preparation method was facile, cost-effective, safe, and eco-friendly, and the resulting SAM sorbents were exceptional in capacity, dynamics, regenerability, and stability.

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Section: Resultssupporting

confidence: 80%

“…Moreover, the methyl species in the HSAM favor the interaction between HSAM and oils. The oil absorption capacities of the HSAM and RSAM are as high as its state-of-the-art counterparts [ 12 , 13 , 19 , 20 , 46 ]. The regenerability is significant for the sorbent, which can reduce the long-running cost.…”

Section: Resultsmentioning

confidence: 99%

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Sun

Zhao

Kong

et al. 2022

Gels

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show abstract

“…The MTMS–gel porosity is correlated with the oil sorption capacity [ 34 ], as presented in Figure 4 B. The gel A1 exhibited the lowest sorption capacity for both investigated lipid fractions, reaching approximately 4.5–5 g g −1 .…”

Section: Resultsmentioning

confidence: 99%

Selective Impact of MTMS-Based Xerogel Morphology on Boosted Proliferation and Enhanced Naphthoquinone Production in Cultures of Rindera graeca Transgenic Roots

Wierzchowski

Nowak

Kawka

et al. 2022

IJMS

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In situ extraction is a method for separating plant secondary metabolites from in vitro systems of plant biomass cultures. The study aimed to investigate the MTMS-based xerogels morphology effect on the growth kinetics and deoxyshikonin productivity in xerogel-supported in vitro culture systems of Rindera graeca hairy root. Cultures were supplemented with three types of xerogel, i.e., mesoporous gel, microporous gel, and agglomerated precipitate, in the disintegrated or monolithic form. Structure, oil sorption capacity, and SEM analyses for xerogel-based additives were performed. Application of monolithic macroporous xerogel resulted in the highest biomass proliferation, i.e., 5.11-fold fresh biomass increase after four weeks of the screening culture. The highest deoxyshikonin production (i.e., 105.03 µg) was noted when hairy roots were maintained with particles of disintegrated mesoporous xerogel. The detailed kinetics investigations (6-week culture) revealed the highest growth of hairy root biomass and secondary metabolite production, equaling 9.46-fold fresh weight biomass and 204.08 µg deoxyshikonin, respectively. MTMS-based xerogels have been recognized as selective biocompatible scaffolds for boosting the proliferation of transgenic roots or for productivity enhancement of naphthoquinones without detrimental effects on biomass growth, and their successful applicability in in situ removal of secondary plant metabolites has been experimentally confirmed.

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“…As is well-known, SPMs are commonly synthesized by hydrolytic condensation of silanes with acids or bases as catalysts . To enhance their mechanical properties, various approaches have been utilized (e.g., new precursors and reaction systems), but often caused degradation of other properties such as a substantial density and thermal conductivity increase. ,− Recently, we prepared strong, compressible, bendable, and stretchable silicone sponges, but their thermal conductivity still needed to be reduced further . In addition, the mechanical properties of SPMs could also be enhanced by consolidating their skeletons via chemical cross-linking or hybridization with diverse reinforcing materials. − In spite of significant progress, the methods are often complicated, for most of the reinforcing materials have poor compatibility in the reaction systems and need to be chemically modified before hybridization .…”

Section: Introductionmentioning

confidence: 99%

Superelastic Clay/Silicone Composite Sponges and Their Applications for Oil/Water Separation and Solar Interfacial Evaporation

Chen

Zhang

2022

Langmuir

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3D porous materials are of great interest in many areas of study, but it is still difficult to prepare those with high elasticity and low thermal conductivity via facile methods. Here, superelastic laponite/silicone (LS) composite sponges with low thermal conductivity are prepared via a simple approach. The LS sponges were analyzed by various characterization methods. The content of laponite nanosheets in LS sponges has a great influence on the microstructure, comprehensive mechanical properties, and thermal conductivity. LS sponges feature (i) high mechanical strength, compressibility, and elasticity, (ii) excellent superhydrophobicity/superoleophilicity, and (iii) low thermal conductivity. Consequently, LS sponges could be used for water purification, for example, oil/water separation and solar-driven interfacial evaporation in combination with carbon nanotubes (CNTs). The LS/CNTs solar evaporator has a remarkable evaporation rate of 1.77 kg m −2 h −1 for the 3.5 wt % NaCl aqueous solution under 1 kW m −2 irradiation and high salt resistance. We foresee that this study will promote the development of new 3D porous materials and their applications.

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Microstructure and Adsorption Properties of MTMS / TEOS Co-precursor Silica Aerogels Dried at Ambient Pressure

Cited by 28 publications

References 24 publications

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Selective Impact of MTMS-Based Xerogel Morphology on Boosted Proliferation and Enhanced Naphthoquinone Production in Cultures of Rindera graeca Transgenic Roots

Superelastic Clay/Silicone Composite Sponges and Their Applications for Oil/Water Separation and Solar Interfacial Evaporation

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