The Effect of Supercritical Carbon Dioxide Treatment on Physical Properties Improvement of Fulvic Acid

KSBB Journal ◽  
2011 ◽  
Vol 26 (6) ◽  
pp. 523-528
Author(s):  
Joo-Hee Lee ◽  
Jung-Nam Park ◽  
Byung-Soo Chun
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Physical Properties ◽  
Fulvic Acid ◽  
Supercritical Carbon

Coatings from Liquid and Supercritical Carbon Dioxide

2004 ◽  
Author(s):  
Yury Chernyak ◽  
Florence Henon
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Physical Properties ◽  
Organic Liquid ◽  
Spray Coating ◽  
Organic Liquids ◽  
Liquid Density ◽  
Operating Pressure ◽  
Interfacial Tensions ◽  
Supercritical Carbon

This chapter describes several aspects of the use of carbon dioxide as a solvent or cosolvent in coating applications. The primary impetus for using carbon dioxide for this purpose has been the alleviation of volatile emissions and liquid solvent wastes. However, the special physical properties of liquid and supercritical carbon dioxide may offer some processing advantages over conventional organic or aqueous solvents. Liquid carbon dioxide is quite compressible, and a reduction in temperature results not only in a reduction in the operating pressure, but also in a significant increase in the liquid density to values of approximately 0.9 g/cm3. At these high liquid densities, carbon dioxide exhibits improved solvent performance, but with much lower viscosities and interfacial tensions than aqueous or organic liquid solvents. Under supercritical conditions, carbon dioxide also exhibits high densities, low viscosities, and improved solvent power. Low viscosities and interfacial tensions tend to facilitate the transport of the solvents into any crevices or imperfections on the surface to be covered, and this might prove advantageous in the coating of patterned or etched surfaces. Since carbon dioxide dissolves and diffuses easily into many different polymers and organic liquids, it can also be used to reduce the viscosity of coating solutions. Whether in the liquid or the supercritical state, the temperature and pressure of the mixture can be used to control its physical properties in ways that are impossible to achieve with traditional solvents. These distinguishing features have raised the level of industrial interest in carbon dioxide as a solvent for coating applications, beyond those based solely on environmental concerns. In this chapter, we will discuss current applications and research on the use of CO2 as a solvent for coatings. The first section deals with spray coating from supercritical CO2. Subsequent sections deal with the use of liquid coatings, such as spin and free meniscus coatings, and impregnation coatings. Since the start of the 20th century (ca. 1907), atomization has been the basis for conventional spray coating applications (Muirhead, 1974). Typically, atomization is caused by high shear of the coating fluid in air, leading to droplet or particle formation.

scholarly journals Physical Properties of Wheat Flour Treated by Supercritical Carbon Dioxide

2012 ◽  
Vol 2 ◽  
pp. 27-31 ◽  
Author(s):  
Hee-Moon Kang ◽  
Joo-Hee Lee ◽  
Ryoung-Hee Kim ◽  
Jun-Ho Yun ◽  
Byung-Soo Chun
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Physical Properties ◽  
Wheat Flour ◽  
Supercritical Carbon

Physical properties of low rank coals dried with supercritical carbon dioxide

2000 ◽  
Vol 18 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Yoshio Iwai ◽  
Tadaaki Murozono ◽  
Yasutake Koujina ◽  
Yasuhiko Arai ◽  
Kinya Sakanishi
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Physical Properties ◽  
Low Rank ◽  
Low Rank Coals ◽  
Supercritical Carbon

scholarly journals Supercritical Carbon Dioxide Isolation of Cellulose Nanofibre and Enhancement Properties in Biopolymer Composites

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5276
Author(s):  
Olaiya N. G. ◽  
Abdul Khalil H. P. S. ◽  
Salah M. El-Bahy ◽  
Mohd Rafatullah ◽  
Che K. Abdullah ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Zeta Potential ◽  
Physical Properties ◽  
Fibre Diameter ◽  
Crystallinity Index ◽  
Diameter Distribution ◽  
Fibre Size ◽  
Ft Ir ◽  
Supercritical Carbon

The physical properties, such as the fibre dimension and crystallinity, of cellulose nanofibre (CNF) are significant to its functional reinforcement ability in composites. This study used supercritical carbon dioxide as a fibre bundle defibrillation pretreatment for the isolation of CNF from bamboo, in order to enhance its physical properties. The isolated CNF was characterised through zeta potential, TEM, XRD, and FT-IR analysis. Commercial CNF was used as a reference to evaluate the effectiveness of the method. The physical, mechanical, thermal, and wettability properties of the bamboo and commercial CNF-reinforced PLA/chitin were also analysed. The TEM and FT-IR results showed the successful isolation of CNF from bamboo using this method, with good colloidal stability shown by the zeta potential results. The properties of the isolated bamboo CNF were similar to the commercial type. However, the fibre diameter distribution and the crystallinity index significantly differed between the bamboo and the commercial CNF. The bamboo CNF had a smaller fibre size and a higher crystallinity index than the commercial CNF. The results from the CNF-reinforced biocomposite showed that the physical, mechanical, thermal, and wettability properties were significantly different due to the variations in their fibre sizes and crystallinity indices. The properties of bamboo CNF biocomposites were significantly better than those of commercial CNF biocomposites. This indicates that the physical properties (fibre size and crystallinity) of an isolated CNF significantly affect its reinforcement ability in biocomposites. The physical properties of isolated CNFs are partly dependent on their source and production method, among other factors. These composites can be used for various industrial applications, including packaging.

Whey-grape juice drink processed by supercritical carbon dioxide technology: Physical properties and sensory acceptance

LWT ◽  
2018 ◽  
Vol 92 ◽  
pp. 80-86 ◽  
Author(s):  
Gabriela V. Amaral ◽  
Eric Keven Silva ◽  
Ana Letícia R. Costa ◽  
Verônica O. Alvarenga ◽  
Rodrigo N. Cavalcanti ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Physical Properties ◽  
Grape Juice ◽  
Sensory Acceptance ◽  
Supercritical Carbon
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