Hydrophobic TiO2–SiO2 composite aerogels synthesized via in situ epoxy-ring opening polymerization and sol-gel process for enhanced degradation activity

Parale, Vinayak G.; Kim, Tae-Hee; Lee, Kyu‐Yeon; Phadtare, Varsha D.; Dhavale, Rushikesh P.; Jung, Hae-Noo-Ree; Park, Hyung Ho

doi:10.1016/j.ceramint.2019.10.231

Cited by 65 publications

(24 citation statements)

References 47 publications

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“…Furthermore, supercritical fluids are used to obtain aerogel [ 5 , 6 , 7 ]—an innovative material with properties such as low density, high porosity and specific surface area. Aerogels can be prepared using various initial materials: organic [ 8 , 9 ], inorganic [ 10 , 11 , 12 ] and their mixture. Due to these properties, aerogels have a number of promising applications [ 12 , 13 , 14 , 15 ]: from thermal insulation, sensors and catalysts to drug-delivery systems, tissue engineering and hemostatic agents.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Aerogel Production Processes: Solvent Exchange under High Pressure Combined with Supercritical Drying in One Apparatus

Lebedev

Suslova

Troyankin

et al. 2021

Gels

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This work aims to contribute to the theoretical and experimental research of supercritical processes for intensification and combination in one apparatus. Investigation is carried out to improve production technology of organic alginate aerogels. It is proposed within the investigation to carry out the solvent exchange stage, an important stage of organic aerogels production, under pressure in a carbon dioxide medium in the same apparatus used for supercritical drying. The phase behavior in the system “carbon dioxide–water–2-propanol”, which arises during such a solvent exchange stage, is studied theoretically. An experimental study of the process of step-by-step solvent exchange under pressure was carried out through multiphase and homogeneous regions of the phase diagram of such a system. As a result, new highly efficient technology for the production of organic aerogels was proposed, which can be implemented by combining the two main stages of the process.

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Section: Introductionmentioning

confidence: 99%

Investigation of Aerogel Production Processes: Solvent Exchange under High Pressure Combined with Supercritical Drying in One Apparatus

Lebedev

Suslova

Troyankin

et al. 2021

Gels

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“…Water repellency of the coating surface could be significantly enhanced by the use of SiO 2 and TiO 2 NPs due to coating porosity [12]. Hydrophobic TiO 2 -SiO 2 porous composite can be synthesized by several methods [13]. For instance, Kim et al [14] reported a cost-effective SiO 2 -TiO 2 composite using titanium oxychloride as a TiO 2 precursor, which can be applied for the purification of the contaminated air and this degradation of organic contaminations [12,15,16].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic and low-hysteresis coating based on rubber-modified TiO2/SiO2 nanoparticles

et al. 2021

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In this article, the wettability of a superhydrophobic layer from rubber-modified TiO 2 /SiO 2 nanocomposite is studied. The nanocomposites were prepared with various ratios of TiO 2 and SiO 2 nanoparticles (NPs) and then studied the effect of annealing, UV irradiation and aging after coating on a substrate. Results show that the average contact angle of deionized water droplets on the most hydrophobic coating is 129.5°, which increases up to 151.0°by UV irradiation. In addition, the lowest surface energy of the prepared layers was measured as 29.61 mJ m -2 . The hydrophobicity of the coating surface was investigated after annealing (at temperatures up to 300°C), and results show that the maximum contact angle is about 150°. The dynamics of water droplets on the most hydrophobic coating were investigated by rapid imaging, and results show no hysteresis for surface wetting. Fourier transform infrared spectroscopy shows that UV irradiation causes the formation of C-H functional groups on the surface without considerable change in the hydrophobicity, while the annealing process has no significant effects on the functional groups. The morphology of the coatings was investigated by scanning electron microscopy, and results reveal that the roughness of surfaces increases due to annealing and UV radiation. In addition, a minimum increase in the roughness coefficient is estimated as 73% of the initial value after annealing, which is in agreement with atomic force microscopy results.

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“…Aerogel, as a new generation of 3D network material, possesses many applications such as catalysis [ 12 , 13 , 14 ], adsorption, and energy storage equipment due to its various superior properties including a high porosity, low cost, and large specific surface area [ 15 , 16 ]. Unlike traditional adsorbents, cellulose nanofiber (CNF) aerogels combine the advantages of both aerogel-type materials and many other superior properties such as rich sources, renewability, biodegradability, and ease of modification [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Nanocellulose Aerogel Loaded with Modified UiO-66 as Efficient Adsorbent for Heavy Metal Ions Removal

Tan

2020

Nanomaterials

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Currently, the preparation of outstanding adsorbents has attracted public concern in environmentally friendly and sustainable pollutant redress. Herein, we report a directional freeze-drying method to prepare a strong and reusable adsorbent by introducing metal-organic framework which modified by ethylene diamine tetraacetic acid (named UiO-66-EDTA) into cellulose nanofiber (CNF) aerogel. Compared to traditional aerogels, the fabricated adsorbent showed a good flexibility and reusability by forming a homogeneous three-dimensional structure. By controlling the concentration of a crosslinkable carboxymethyl cellulose (CMC) solution, we produced aerogels with different pore structures and fibrillar, columnar, and lamellar morphologies. The obtained UiO-66-EDTA/CNF/CMC aerogel (U-EDTACCA) showed an excellent adsorption performance for a total of nine types of heavy metal ions, as the removal efficiency could reach 91%. Moreover, the aerogels could retain 88% of their original shape after five cycles. The aerogel may be an appropriate material for the adsorption of heavy metal ions.

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Hydrophobic TiO2–SiO2 composite aerogels synthesized via in situ epoxy-ring opening polymerization and sol-gel process for enhanced degradation activity

Cited by 65 publications

References 47 publications

Investigation of Aerogel Production Processes: Solvent Exchange under High Pressure Combined with Supercritical Drying in One Apparatus

Investigation of Aerogel Production Processes: Solvent Exchange under High Pressure Combined with Supercritical Drying in One Apparatus

Superhydrophobic and low-hysteresis coating based on rubber-modified TiO2/SiO2 nanoparticles

Anisotropic Nanocellulose Aerogel Loaded with Modified UiO-66 as Efficient Adsorbent for Heavy Metal Ions Removal

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