Analytical Supercritical Fluid Extraction

Valcárcel, Miguel; Castro, M. D. Luque de; Tena, Marı́a Teresa

doi:10.1007/978-3-642-78673-0

Cited by 151 publications

(59 citation statements)

References 89 publications

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“…(6). To obtain the two-phase morphologies, the field is then clipped to the corresponding ␣ calculated in Eq.…”

Section: E Representative Pore Morphologymentioning

confidence: 99%

“…These properties allow the possibility of extraction at lower temperatures than for the thermal annealing process. SCCO 2 has been extensively used in industrial and analytical processes and waste detoxification 6 and has recently found interesting applications in semiconductors. Researchers at Los Alamos National Laboratory (Los Alamos, NM) have successfully removed photoresist using SCCO 2 with minimal use of solvent.…”

Section: Introductionmentioning

confidence: 99%

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Supercritical CO₂extraction of porogen phase: An alternative route to nanoporous dielectrics

et al. 2004

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We present a supercritical CO 2 (SCCO 2 ) process for the preparation of nanoporous organosilicate thin films for ultralow dielectric constant materials. The porous structure was generated by SCCO 2 extraction of a sacrificial poly(propylene glycol) (PPG) from a nanohybrid film, where the nanoscopic domains of PPG porogen are entrapped within the crosslinked poly(methylsilsesquioxane) (PMSSQ) matrix. As a comparison, porous structures generated by both the usual thermal decomposition (at approximately 450°C) and by a SCCO 2 process for 25 and 55 wt% porogen loadings were evaluated. It is found that the SCCO 2 process is effective in removing the porogen phase at relatively low temperatures (<200°C) through diffusion of the supercritical fluid into the phase-separated nanohybrids and selective extraction of the porogen phase. Pore morphologies generated from the two methods are compared from representative three-dimensional (3D) images built from small-angle x-ray scattering (SAXS) data.

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“…(6). To obtain the two-phase morphologies, the field is then clipped to the corresponding ␣ calculated in Eq.…”

Section: E Representative Pore Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Supercritical CO₂extraction of porogen phase: An alternative route to nanoporous dielectrics

et al. 2004

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“…Debinding based on a supercritical-fluid technology does not produce pollutants and makes it possible to recycle the binders. The supercritical fluid has high diffusivity that leads to a significant reduction in extraction time and is suitable for energy saving processes [10]. In addition, it allows the production of high quality translucent alumina parts without physical damage to the debound part.…”

Section: Introductionmentioning

confidence: 99%

Powder Injection Molding of Translucent Alumina using Supercritical Fluid Debinding

Kim¹,

Byun²,

Suk³

et al. 2014

j. Korean Powder Metall. Inst.

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································································································································································································································Abstract The powder injection molding process having advantages in manufacturing three-dimensional precision parts essentially requires a debinding process before sintering to remove the binders used for preparing feedstock. In this study, powder injection molding of translucent alumina was performed, and carbon dioxide (CO 2 ) is used as a supercritical fluid that makes it possible to remove a large amount of binder, which is paraffin wax. The relationship between the optical property of translucent alumina and the debinding condition (temperature and pressure) of supercritical CO 2 was investigated. As temperature and pressure increased, extraction rate of the binder showed rising tendency and average grain size after sintering process was relatively fine. On the other hand, optical transmittance was reduced. As a result, the debinding condition at 50 o C and 20 MPa that represents the lowest extraction rate, 8.19 × 10 −3 m 2 /sec, corresponds to the largest grain size of 14.7 µm and the highest optical transmittance of 45.2%.

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“…Therefore, there would be more rapid mass transfer, thus, enabling scCO 2 to more easily permeate chitosan particles. This would increase the opportunities for scCO 2 and the cosolvent to interact with chitosan, enhancing the extraction yield (Luque de Castro, Valcarcel, & Tena, 1994). Additionally, the chitosan extracted at a high temperature can increase breaking of the inter-molecular hydrogen bonding of chitosan molecules (Young & Weber, 1997) and improve solubility of chitosan.…”

Section: Static-dynamic Supercritical Carbon Dioxidementioning

confidence: 98%

Enrichment desired quality chitosan fraction and advance yield by sequential static and static–dynamic supercritical CO2

Hsieh

Chin

Tsai

2015

Carbohydrate Polymers

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Analytical Supercritical Fluid Extraction

Cited by 151 publications

References 89 publications

Supercritical CO₂extraction of porogen phase: An alternative route to nanoporous dielectrics

Supercritical CO₂extraction of porogen phase: An alternative route to nanoporous dielectrics

Powder Injection Molding of Translucent Alumina using Supercritical Fluid Debinding

Enrichment desired quality chitosan fraction and advance yield by sequential static and static–dynamic supercritical CO2

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Analytical Supercritical Fluid Extraction

Cited by 151 publications

References 89 publications

Supercritical CO2extraction of porogen phase: An alternative route to nanoporous dielectrics

Supercritical CO2extraction of porogen phase: An alternative route to nanoporous dielectrics

Powder Injection Molding of Translucent Alumina using Supercritical Fluid Debinding

Enrichment desired quality chitosan fraction and advance yield by sequential static and static–dynamic supercritical CO2

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Supercritical CO₂extraction of porogen phase: An alternative route to nanoporous dielectrics

Supercritical CO₂extraction of porogen phase: An alternative route to nanoporous dielectrics