ESR and ESEM Study of Spin Probe Aqueous Solutions Adsorbed on Silica Gel

1986 ◽  
pp. 411-424
Author(s):  
N. Romanelli ◽  
G. Martini ◽  
L. Kevan
Keyword(s):  
Aqueous Solutions ◽  
Silica Gel ◽  
Spin Probe

scholarly journals Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3829
Author(s):  
Ekaterina M. Zubanova ◽  
Sergei V. Kostjuk ◽  
Peter S. Timashev ◽  
Yury A. Rochev ◽  
Alexander I. Kokorin ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Coming Out ◽  
Epr Spectroscopy ◽  
Spin Probe ◽  
Guest Molecule ◽  
Continuous Wave ◽  
Paramagnetic Resonance ◽  
Molten Globules ◽  
The Individual ◽  
Tempo Radical

Coil to globule transition in poly(N-isopropylacrylamide) aqueous solutions was studied using spin probe continuous-wave electronic paramagnetic resonance (CW EPR) spectroscopy with an amphiphilic TEMPO radical as a guest molecule. Using Cu(II) ions as the “quencher” for fast-moving radicals in the liquid phase allowed obtaining the individual spectra of TEMPO radicals in polymer globule and observing inhomogeneities in solutions before globule collapsing. EPR spectra simulations confirm the formation of molten globules at the first step with further collapsing and water molecules coming out of the globule, making it denser.

scholarly journals Adsorption of Model Dyes on Recycled Silica Gel

Proceedings ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 10
Author(s):  
Fatima Sbait Wahshi ◽  
Maitha Dhaiman Alqahtani ◽  
Manhal Abdulla ◽  
Tholkappiyan Ramachandran ◽  
Fathalla Hamed ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Silica Gel ◽  
Adsorption Process ◽  
Food Colorants ◽  
Waste Products ◽  
Optimal Procedure ◽  
Biological Stains

Silica gel was used as an adsorbent for dyes in aqueous solutions. Afterwards, the silica gel with the adsorbed dye was heated to 600 °C, at which the dye combusted, leaving behind clean silica gel. This silica gel can be reused in the adsorption process. The operation leaves behind little waste products. It is an optimal procedure for educational and other research laboratories which are working with biological stains, food colorants and some non-commercial dyes.

scholarly journals Recovery of gangliosides from aqueous solutions on styrene-divinylbenzene copolymer columns

2002 ◽  
Vol 43 (8) ◽  
pp. 1335-1340 ◽  
Author(s):  
Iuliana Popa ◽  
Cristina Vlad ◽  
Jacques Bodennec ◽  
Jacques Portoukalian
Keyword(s):  
Aqueous Solutions ◽  
Silica Gel ◽  
Salt Concentration ◽  
High Stability ◽  
Solid Phase ◽  
General Procedure ◽  
Optimal Conditions ◽  
Alkaline Conditions ◽  
Styrene Divinylbenzene ◽  
Multiple Cycles

An investigation was made using a styrene-divinylbenzene copolymer as a solid phase sorbent to recover gangliosides from aqueous solutions. A comparison with octadecyl-bonded (C18) silica gel showed that the general procedure used to purify gangliosides on C18 silica gel could be used with the copolymer. The yield of gangliosides depended on various parameters such as the composition of the conditioning solution, the salt concentration of the loading solution, and the amount of applied gangliosides per gram of copolymer. In optimal conditions, the recovery of gangliosides and other lipids present in the upper phases of partition was higher than 95%. Using radiolabeled gangliosides, it was found that gangliosides present in serum-containing medium could also be quantitatively recovered on copolymer, provided the medium was diluted with an equal volume of methanol prior to its application onto the column.The major advantage of the copolymer is its high stability in acidic or alkaline conditions that allows multiple cycles of cleaning and reconditioning of the sorbent without alteration of its chromatographic properties.

Chromium removal from aqueous solutions using new silica gel conjugates of desferrioxamine or diethylenetriaminepentaacetic acid

2020 ◽  
Vol 27 (13) ◽  
pp. 15635-15644
Author(s):  
Aamir Rasheed ◽  
Alexandrina Aparecida Costa Carvalho ◽  
Gabriel Gustinelli Arantes de Carvalho ◽  
Tahseen Ghous ◽  
Cassiana Seimi Nomura ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Silica Gel ◽  
Chromium Removal ◽  
Diethylenetriaminepentaacetic Acid

A novel environment-friendly hybrid material based on a modified silica gel with a bispyrazole derivative for the removal of ZnII, PbII, CdIIand CuIItraces from aqueous solutions

2017 ◽  
Vol 4 (11) ◽  
pp. 1821-1831 ◽  
Author(s):  
Smaail Radi ◽  
Mohamed El Massaoudi ◽  
Maryse Bacquet ◽  
Stéphanie Degoutin ◽  
N. N. Adarsh ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Silica Gel ◽  
Hybrid Material ◽  
Efficient Removal ◽  
Modified Silica ◽  
Modified Silica Gel ◽  
Environment Friendly ◽  
Novel Environment ◽  
Removal Of Heavy Metals

New surface-functionalized with bispyrazole receptor was designed for efficient removal of heavy metals. The architecture of host–guest on the surface was identified.

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