Melamine‐crosslinked Polyimide Aerogels from Supercritical Ethanol Drying with Improved In‐use Shape Stability Against Shrinking

2021 ◽  
pp. 2100645
Author(s):  
Weiwang Chen ◽  
Sha Liu ◽  
Yueyan Sun ◽  
Xiaomeng Zhou ◽  
Fenglei Zhou
Keyword(s):  
Shape Stability ◽  
Supercritical Ethanol

Adjuvant therapeutic use of supercritical-ethanol extracts of Curcuma species with cancer drugs in rhabdomycosarcoma cell lines

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
C Ramachandran ◽  
SM Nair ◽  
KW Quirrin ◽  
EA Escalon ◽  
SJ Melnick
Keyword(s):  
Cell Lines ◽  
Therapeutic Use ◽  
Cancer Drugs ◽  
Supercritical Ethanol ◽  
Ethanol Extracts

Transformation of Nitrogen during Microalgae Liquefaction in Subcritical/Supercritical Ethanol

2020 ◽  
Vol 34 (11) ◽  
pp. 14182-14189 ◽  
Author(s):  
Yang Peng ◽  
Chuxuan Zhang ◽  
Xun Gong ◽  
Shuang Wang ◽  
Huping Liu ◽  
...  
Keyword(s):  
Supercritical Ethanol

scholarly journals New Evaluation Procedure for Multi-Dimensional Mechanical Strains and Tangent Moduli of Breast Implants: IDEAL IMPLANT® Structured Breast Implant Compared to Silicone Gel Implants

2019 ◽  
Vol 6 (2) ◽  
pp. 43 ◽  
Author(s):  
Harold J. Brandon ◽  
Larry S. Nichter ◽  
Dwight D. Back
Keyword(s):  
Breast Implant ◽  
Capsular Contracture ◽  
Compressive Load ◽  
Evaluation Procedure ◽  
Shape Stability ◽  
Silicone Gel ◽  
Tangent Moduli ◽  
Compressive Loads ◽  
Cohesive Gel ◽  
The Ideal

The IDEAL IMPLANT® Structured Breast Implant is a dual lumen saline-filled implant with capsular contracture and deflation/rupture rates much lower than single-lumen silicone gel-filled implants. To better understand the implant’s mechanical properties and to provide a potential explanation for these eight-year clinical results, a novel approach to compressive load testing was employed. Multi-dimensional strains and tangent moduli, metrics describing the shape stability of the total implant, were derived from the experimental load and platen spacing data. The IDEAL IMPLANT was found to have projection, diametric, and areal strains that were generally less than silicone gel implants, and tangent moduli that were generally greater than silicone gel implants. Despite having a relatively inviscid saline fill, the IDEAL IMPLANT was found to be more shape stable compared to gel implants, which implies potentially less interaction with the capsule wall when the implant is subjected to compressive loads. Under compressive loads, the shape stability of a higher cross-link density, cohesive gel implant was unexpectedly found to be similar to or the same as a gel implant. In localized diametric compression testing, the IDEAL IMPLANT was found to have a palpability similar to a gel implant, but softer than a cohesive gel implant.

Shape Stability of Magnetic Fluid

1985 ◽  
Vol 1 (7) ◽  
pp. 806-807 ◽  
Author(s):  
H. Miyajima ◽  
Y. Kurihara ◽  
S. Chikazumi
Keyword(s):  
Magnetic Fluid ◽  
Shape Stability

scholarly journals Upgrading of Coffee Biocrude Oil Produced by Pyrolysis of Spent Coffee Grounds: Behavior of Fatty Acids in Supercritical Ethanol Reaction and Catalytic Cracking

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 835
Author(s):  
Ji-Yeon Park ◽  
Md Amirul Alam Kanak ◽  
In-Gu Lee
Keyword(s):  
Fatty Acids ◽  
Oxygen Content ◽  
Catalytic Cracking ◽  
Total Content ◽  
Pyrolysis Oil ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Supercritical Ethanol ◽  
Supercritical Reaction ◽  
Biocrude Oil

Spent coffee grounds contain lipids (fatty acids) in addition to cellulose, hemicellulose, and lignin. The reaction process for upgrading biocrude oil produced from spent coffee grounds is different from that followed for upgrading biomass pyrolysis oil, such as processes that utilize sawdust. The feasibility of upgrading coffee biocrude oil through a supercritical ethanol reaction with plastic pyrolysis oil and through catalytic cracking for the improvement of the undesirable properties of biocrude oil, caused by the presence of oxygenated compounds, was evaluated. The initial oxygen content of the coffee biocrude oil was 16.9 wt%. The oil comprised a total content of 40.9% fatty acids, as found by analyzing the GC-MS peak area. After the supercritical ethanol reaction at 340 ∘C, the oxygen content was decreased to 9.9 wt%. When the MgNiMo/AC catalyst was applied to the supercritical reaction, the oxygen content was further decreased to 8.5 wt%. The esterification of the fatty acids in the biocrude oil with ethanol converted them to esters. After the supercritical reaction of coffee biocrude oil with plastic pyrolysis oil (1:2 (w/w)), the oxygen content was 6.4 wt%. After the catalytic cracking of the biocrude oil by Ni/MCM-41 at 400 ∘C, the fatty acids were converted to hydrocarbons, C9 to C21, and the oxygen content decreased to a final value of 2.8 wt%.

LIQUEFACTION OF OIL SHALE IN SUPERCRITICAL ETHANOL

Oil Shale ◽  
2018 ◽  
Vol 35 (3) ◽  
pp. 279 ◽  
Author(s):  
T YANG ◽  
B ZHOU ◽  
R LI ◽  
B LI ◽  
W ZHANG ◽  
...  
Keyword(s):  
Oil Shale ◽  
Supercritical Ethanol

scholarly journals Soot removal from ancient Egyptian complex painted surfaces using a double network gel: Empirical tests on the ceiling of the sanctuary of Osiris in the temple of Seti I – Abydos

2020 ◽  
Author(s):  
Ehab Awad Al-Emam ◽  
Abdel Ghafour Motawea ◽  
Joost Caen ◽  
Koen Janssens
Keyword(s):  
Self Healing ◽  
Wall Paintings ◽  
Shape Stability ◽  
Double Network ◽  
Ancient Egyptian ◽  
Third Phase ◽  
Digital Microscope ◽  
Seti I ◽  
The Temple

Abstract In this study, we evaluated the ease of removal of soot layers from ancient wall paintings by employing double network gels as a controllable cleaning method. The ceiling of the temple of Seti I (Abydos, Egypt) is covered with thick layers of soot; this is especially the case in the sanctuary of Osiris. These layers may have been accumulated during the occupation of the temple by Christians, fleeing the Romans in the first centuries A.D.. Soot particulates are one of the most common deposits to be removed during conservation-restoration activities of (Egyptian) wall paintings. They usually mask the painted reliefs and reduce the permeability of the painted surface. A Polyvinyl alcohol-borax/agarose (PVA-B/AG) double network gel was selected for this task since its properties were expected to be compatible with the cleaning treatment requirements. The gel is characterized by its flexibility, permitting to take the shape of the reliefs, while also having self-healing properties, featuring shape stability and an appropriate capacity to retain liquid. The gel was loaded with several cleaning reagents that proved to be effective for soot removal. Two sets of soot removal tests were conducted with these gel composites. The cleaned surfaces were examined in situ with the naked eye and with a digital microscope in order to select the best gel composite. The gel composite, loaded with a solution of 5% ammonia, 0.3% ammonium carbonate, and 0.3% EDTA yielded the most satisfactory results and allowed to safely remove a crust of thick soot particles from the surface. Thus, during a third phase of the study, it was used successfully to clean a larger area of the ceiling.

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