Texture characterization of SiO<sub>2</sub>-ZrO<sub>2</sub> aerogels by SAXS, image analysis of TEM, and N<sub>2</sub> adsorption-desorption

1997 ◽  
Author(s):  
S. Blacher ◽  
P. Tihon ◽  
R. Pirard ◽  
J. P. Pirard ◽  
B. Diez ◽  
...  
Keyword(s):  
Image Analysis ◽  
Texture Characterization ◽  
Adsorption Desorption

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

Characterization of viscous fingering in a radial Hele-Shaw cell by image analysis

1999 ◽  
Vol 26 (1-2) ◽  
pp. 153-160 ◽  
Author(s):  
M.-N. Pons ◽  
E. M. Weisser ◽  
H. Vivier ◽  
D. V. Boger
Keyword(s):  
Image Analysis ◽  
Viscous Fingering ◽  
Hele Shaw Cell

Characterization of objects arrangement in image analysis of physical systems

Vacuum ◽  
2007 ◽  
Vol 82 (2) ◽  
pp. 282-285 ◽  
Author(s):  
Dušan Novotný ◽  
Rudolf Hrach ◽  
Michal Kostern
Keyword(s):  
Image Analysis ◽  
Physical Systems

scholarly journals Synthesis and Characterization of Nanoporous Monetite Which Can Be Applicable for Drug Carrier

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Esmael Salimi ◽  
Jafar Javadpour
Keyword(s):  
Surface Area ◽  
Cetyltrimethylammonium Bromide ◽  
Drug Carrier ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Plate Shape ◽  
Desorption Isotherms ◽  
Adsorption Desorption

Wormhole-like mesostructured monetite was successfully synthesized using cetyltrimethylammonium bromide (C19H42BrN, CTAB), as a porosity agent. X-ray techniques and FTIR reveal that the crystalline grains consist of highly crystalline pure monetite phase. Monetite rods with diameter around 20–40 nm and length in the range of 50–200 nm were confirmed by FESEM and TEM. Based on N2adsorption-desorption isotherms investigation, surface area increased up to 31.5 m2/g due to the removal of surfactant after calcinations at 400°C. The results indicate that CTAB can not only affect monetite crystallization but also change particles morphology from plate shape to rod-like.

Characterization of mesoporous region by the scanning of the hysteresis loop in adsorption–desorption isotherms

Adsorption ◽  
2021 ◽  
Author(s):  
C. F. Toncón-Leal ◽  
J. Villarroel-Rocha ◽  
M. T. P. Silva ◽  
T. P. Braga ◽  
K. Sapag
Keyword(s):  
Hysteresis Loop ◽  
Desorption Isotherms ◽  
Adsorption Desorption
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