Intensification methods of supercritical drying for aerogels production

Menshutina, Natalia; Tsygankov, Pavel; Khudeev, Illarion I.; Lebedev, Artem

doi:10.1080/07373937.2020.1866005

Cited by 17 publications

(4 citation statements)

References 31 publications

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“…All this occurs, and supercritical drying requires high temperature and pressure to produce a good structure that is dependent on the pore fluid. In this technique, the type of solvent that dissolves on wet gels must be carefully considered when determining the critical drying conditions 37,38 . Carbon dioxide solvent was introduced as an alternative solution because the critical point was lower than other solvents (TC = 31°C) and convenient with a critical temperature (TC) solvent value of alcohol solvent was higher in ethanol (TC = 240°C) 39,40 .…”

Section: Production Methodsmentioning

confidence: 99%

“…In this technique, the type of solvent that dissolves on wet gels must be carefully considered when determining the critical drying conditions. 37,38 Carbon dioxide solvent was introduced as an alternative solution because the critical point was lower than other solvents (TC = 31 C) and convenient with a critical temperature (TC) solvent value of alcohol solvent was higher in ethanol (TC = 240 C). 39,40 The critical drying conditions depend on the type of solvent used in the wet gel.…”

Section: Supercritical Dryingmentioning

confidence: 99%

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Organic aerogel as electro‐catalytic support in low‐temperature fuel cell

Osman

Kamarudin

Basri

et al. 2022

Intl J of Energy Research

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Fuel cells have been developed efficiently in recent years as a secure and highenergy conversion technology. The innovation in electrocatalysis focuses on initiatives to minimize or replace Pt electrodes used. As an alternative, organic aerogel materials are normally used as electrodes in low temperature fuel cells due to their high electronic conducting and electrocatalytic characteristics. These are usually characterized by fundamental functional elements of strong covalent C-C bonds from organic precursors. This review will mainly focus on organic aerogel nanomaterials related to carbon aerogels, carbon nanotube aerogels, and graphene aerogels as electrocatalytic supports by surface modification or structural features in catalysis. In contrast, organic aerogel materials prove to be durable, economical, and active electrocatalysts that can provide outstanding electrocatalytic efficiency in low temperature fuel cell applications. Last, this paper recaps the challenges faced in current fuel cell applications and the use of organic aerogel materials to address these challenges.

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Section: Production Methodsmentioning

confidence: 99%

Section: Supercritical Dryingmentioning

confidence: 99%

Organic aerogel as electro‐catalytic support in low‐temperature fuel cell

Osman

Kamarudin

Basri

et al. 2022

Intl J of Energy Research

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“…The supercritical drying process includes the following steps: displacement of the solvent from the free volume of the vessel for 1 h at a pressure of 120 bar, a temperature of 40 °C, a carbon dioxide flow rate of 500 g/h, supercritical drying for 4 h at a pressure of 120 bar, a temperature of 40 °C, a carbon dioxide flow rate of 200 g/h, and pressure relief at a rate of 4 bar/min. After the pressure was released, the vessel was depressurized, and the dried samples were removed from the vessel [ 36 , 37 ].…”

Section: Methodsmentioning

confidence: 99%

Extrusion-Based 3D Printing for Highly Porous Alginate Materials Production

Menshutina

Abramov

Tsygankov

et al. 2021

Gels

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Three-dimensional (3D) printing is a promising technology for solving a wide range of problems: regenerative medicine, tissue engineering, chemistry, etc. One of the potential applications of additive technologies is the production of highly porous structures with complex geometries, while printing is carried out using gel-like materials. However, the implementation of precise gel printing is a difficult task due to the high requirements for “ink”. In this paper, we propose the use of gel-like materials based on sodium alginate as “ink” for the implementation of the developed technology of extrusion-based 3D printing. Rheological studies were carried out for the developed alginate ink compositions. The optimal rheological properties are gel-like materials based on 2 wt% sodium alginate and 0.2 wt% calcium chloride. The 3D-printed structures with complex geometry were successfully dried using supercritical drying. The resulting aerogels have a high specific surface area (from 350 to 422 m2/g) and a high pore volume (from 3 to 3.78 cm3/g).

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“…134,136,137 Among them, the low-temperature supercritical drying process using carbon dioxide desiccant is currently the most commonly used drying method because it has several advantages such as it is easy to transform into a supercritical state (t cr ¼ 31 C, P cr ¼ 74 bar), 138 is non-toxic, non-ammable, non-explosive, rich in reserves, low in price, derived from the atmosphere, and is a green and safe environmental solvent. 139 The solubility of CO 2 is useful in replacing the solvent in the gel and transferring to the supercritical CO 2 at a critical temperature close to room temperature to form an aerogel. This supercritical drying method can reduce the surface tension, prevent pore collapse, and ensure that a good network structure is preserved aer the transition from the wet gel to the aerogel, while obtaining aerogels with the characteristics required for oil-water separation applications such as high specic surface area and high porosity.…”

Section: Comparison Of the Drying Processmentioning

confidence: 99%