Model development for sc-drying kinetics of aerogels: Part 1. Monoliths and single particles

Selmer, Ilka; Behnecke, Anna-Sophia; Quiño, Jaypee; Braeuer, Andreas; Gurikov, Pavel; Смирнова, Ирина

doi:10.1016/j.supflu.2018.07.002

Cited by 27 publications

(23 citation statements)

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“…Although the explicit use of polysaccharide aerogel particles in thermal insulation applications is unknown, to the best of our knowledge, particulate silica aerogels have widely been investigated for this purpose [222,223]. With the newest advances such as hydrophobization [14] and reinforcement [224] methods as well as post-functionalization (e.g., coating, see [225,226]) and fast supercritical drying [227,228,229] we may expect this area to expand in importance in the upcoming years.…”

Section: Applications Of Polysaccharide Aerogel Particlesmentioning

confidence: 99%

Review on the Production of Polysaccharide Aerogel Particles

et al. 2018

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A detailed study of the production of polysaccharide aerogel (bio-aerogel) particles from lab to pilot scale is surveyed in this article. An introduction to various droplets techniques available in the market is given and compared with the lab scale production of droplets using pipettes and syringes. An overview of the mechanisms of gelation of polysaccharide solutions together with non-solvent induced phase separation option is then discussed in the view of making wet particles. The main steps of particle recovery and solvent exchange are briefly described in order to pass through the final drying process. Various drying processes are overviewed and the importance of supercritical drying is highlighted. In addition, we present the characterization techniques to analyse the morphology and properties of the aerogels. The case studies of bio-aerogel (agar, alginate, cellulose, chitin, κ-carrageenan, pectin and starch) particles are reviewed. Potential applications of polysaccharide aerogel particles are briefly given. Finally, the conclusions summarize the prospects of the potential scale-up methods for producing bio-aerogel particles.

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Section: Applications Of Polysaccharide Aerogel Particlesmentioning

confidence: 99%

Review on the Production of Polysaccharide Aerogel Particles

et al. 2018

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“…The aim of supercritical drying is to extract a solute (in our case ethanol) from a wet gel using supercritical CO 2 (component 1). The mass transport model presented here, and discussed in Selmer et al 2018 from the physical point of view [ 2 ], results in a system of coupled partial differential equations. The partial differential equations are written here in terms of concentration of ethanol (component 2),

.…”

Section: Mass Transport Model Of Supercritical Dryingmentioning

confidence: 99%

“…A comprehensive overview of experimental studies and mass transport models investigating the kinetics of supercritical drying of gels is given by Şahin et al [ 1 ]. Within the last two years, a several model of the supercritical drying for spherical gel particles were developed [ 2 , 3 , 4 , 5 , 6 , 7 ]. All these works show that the gel drying process for particles is significantly faster than for monoliths of comparable size [ 2 , 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…This observation highlights the fact that aerogel particles are highly promising for future applications in industrial products. Selmer et al developed their physical mass transport model for the supercritical drying of gel particles in a packed bed and analyzed mass transfer steps that limit the overall drying kinetic to optimize the process [ 2 , 3 ]. Hatami et al developed a similar model and improved the optimizing procedure to allow a fast drying process with low CO 2 consumption [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper, two possible numerical discretization techniques of the resulting partial differential equations of Selmer et al’s model [ 2 , 3 ] are implemented, namely the finite difference method [ 8 , 9 ] and the finite volume method [ 10 ]. Both discretization techniques are compared numerically by studying the quality of the approximations via Euclidean norm (

) and maximum norm (

) errors, as well as the efficiency via the condition numbers of the linear systems to be solved.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Finite Difference and Finite Volume Simulations for a Sc-Drying Mass Transport Model

Selmer

Farrell

Смирнова

et al. 2020

Gels

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Different numerical solutions of a previously developed mass transport model for supercritical drying of aerogel particles in a packed bed [Part 1: Selmer et al. 2018, Part 2: Selmer et al. 2019] are compared. Two finite difference discretizations and a finite volume method were used. The finite volume method showed a higher overall accuracy, in the form of lower overall Euclidean norm (l2) and maximum norm (l∞) errors, as well as lower mole balance errors compared to the finite difference methods. Additionally, the finite volume method was more efficient when the condition numbers of the linear systems to be solved were considered. In case of fine grids, the computation time of the finite difference methods was slightly faster but for 16 or fewer nodes the finite volume method was superior. Overall, the finite volume method is preferable for the numerical solution of the described drying model for aerogel particles in a packed bed.

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Aerogels

Смирнова¹,

Gurikov²,

Subrahmanyam³

2021

Kirk-Othmer Encyclopedia of Chemical Technology

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Aerogels are a class of open nonfluid porous solid materials known for their low density, high specific surface area, and accessible pores. This combination of characteristics makes them highly promising for a wide gamut of applications ranging from thermal and acoustic insulation, catalysts and sensors, adsorbents and absorbents, energy storage, carriers for drug delivery and nutrition, and scaffolds for tissue engineering and regenerative medicine to starting materials for carbon aerogels and porous mixed oxides. Aerogel technology has faced significant bottlenecks in its commercialization, since its discovery in the 1930s, due to limited technical information and processing expertise required for production scaling. This article presents the significant technology developments in the past 10 years, highlighting the paradigm shift in aerogel processing. Lastly, this article invites the reader to envisage and contribute to a new generation of aerogel materials and applications with the fundamental tenets of aerogel production and pore engineering.

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Model development for sc-drying kinetics of aerogels: Part 1. Monoliths and single particles

Cited by 27 publications

References 71 publications

Review on the Production of Polysaccharide Aerogel Particles

Review on the Production of Polysaccharide Aerogel Particles

Comparison of Finite Difference and Finite Volume Simulations for a Sc-Drying Mass Transport Model

Aerogels

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