Contamination Control in Supercritical CO2 Drying Process for Nano-Scale Memory Manufacturing

This work explore the use of supercritical CO2 drying as alternative technique for the obtainment of pasteurized and high quality dried product. Several tests were conducted on animal, vegetable and fruit matrixes in order to investigate the effectiveness of SC-CO2 drying process at different process conditions. Design of experiment was performed to find the optimal process conditions for vegetable and fruit matrices, using the final water activity of the products as key indicator for the drying efficiency. The inactivation of naturally present microorganisms and inoculated pathogens demonstrated the capability of SC-CO2 drying process to assure a safe product. Moreover, retention of nutrients was compared with conventional drying methods. Results suggest that supercritical drying is a promising alternative technology for food drying. Keywords: supercritical drying; carbon dioxide; food drying; microbial inactivation

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TiO2-HA composites obtained by combination of sol–gel synthesis and a supercritical CO2 drying process

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-021-05659-y ◽

2022 ◽

Author(s):

Gloria M. Hernández Ortiz ◽

Rodrigo Parra ◽

Vanesa Fuchs ◽

María A. Fanovich

Keyword(s):

Supercritical Co2 ◽

Sol Gel ◽

Drying Process ◽

Supercritical Co2 Drying ◽

Sol Gel Synthesis

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Microbial inactivation efficiency of supercritical CO2 drying process

Drying Technology ◽

10.1080/07373937.2018.1433683 ◽

2018 ◽

Vol 36 (16) ◽

pp. 2016-2021 ◽

Cited By ~ 8

Author(s):

Alessandro Zambon ◽

Filippo Michelino ◽

Siméon Bourdoux ◽

Frank Devlieghere ◽

Stefania Sut ◽

...

Keyword(s):

Supercritical Co2 ◽

Microbial Inactivation ◽

Drying Process ◽

Supercritical Co2 Drying ◽

Inactivation Efficiency

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Editorial on Special Issues “Aerogels” and “Aerogels 2018”

Gels ◽

10.3390/gels6030019 ◽

2020 ◽

Vol 6 (3) ◽

pp. 19

Author(s):

Françoise Quignard ◽

Nathalie Tanchoux

Keyword(s):

Porous Structure ◽

Supercritical Co2 ◽

Freeze Drying ◽

Drying Process ◽

Gel Structure ◽

Supercritical Co2 Drying

Aerogels can be defined as ultralight materials with a 3D porous structure, similar to their parent wet gels, where the solvent has been replaced by a gas without a collapse of the gel structure, thanks to the drying process used (supercritical CO2 drying, freeze drying, etc [...]

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Acemannan Gels and Aerogels

Polymers ◽

10.3390/polym11020330 ◽

2019 ◽

Vol 11 (2) ◽

pp. 330

Author(s):

Daniel Miramon-Ortíz ◽

Waldo Argüelles-Monal ◽

Elizabeth Carvajal-Millan ◽

Yolanda López-Franco ◽

Francisco Goycoolea ◽

...

Keyword(s):

Supercritical Co2 ◽

Chemical Structure ◽

Spectroscopic Analysis ◽

Drying Process ◽

Solvent Treatment ◽

Surface Areas ◽

Infrared Spectroscopic Analysis ◽

Bioactive Properties ◽

Supercritical Co2 Drying ◽

Drying Technology

The procedures to obtain two types of acemannan (AC) physical gels and their respective aerogels are reported. The gelation was induced by the diffusion of an alkali or a non-solvent, then supercritical CO2 drying technology was used to remove the solvent out and generate the AC aerogels. Fourier-transform infrared spectroscopic analysis indicated that alkali diffusion produced extensive AC deacetylation. Conversely, the non-solvent treatment did not affect the chemical structure of AC. Both types of gels showed syneresis and the drying process induced further volume reduction. Both aerogels were mesoporous nanostructured materials with pore sizes up to 6.4 nm and specific surface areas over 370 m2/g. The AC physical gels and aerogels enable numerous possibilities of applications, joining the unique features of these materials with the functional and bioactive properties of the AC.

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