scholarly journals Surface electrical potential of ZrO2-SiO2 binary xerogels by EPR pH-sensitive spin probes

2019 ◽  
Author(s):  
Denis Antonov ◽  
Elena Kovaleva ◽  
Leonid Molochnikov ◽  
Andrey Shishmakov
Keyword(s):  
Electrical Potential ◽  
Ph Sensitive ◽  
Spin Probes

Grignard Reagent Addition to5-Alkylamino-4H-Imidazole 3-Oxides: Synthesisof New pH-Sensitive Spin Probes

Synthesis ◽  
2003 ◽  
Vol 2003 (06) ◽  
pp. 0871-0878 ◽  
Author(s):  
Igor A. Kirilyuk ◽  
Tikhon G. Shevelev ◽  
Denis A. Morozov ◽  
Ekaterina L. Khromovskih ◽  
Nikita G. Skuridin ◽  
...  
Keyword(s):  
Grignard Reagent ◽  
Ph Sensitive ◽  
Spin Probes

EPR studies of15N- and2H-substituted pH-sensitive spin probes of imidazoline and imidazolidine types

2001 ◽  
Vol 20 (4) ◽  
pp. 489-505 ◽  
Author(s):  
Yu. I. Glazachev ◽  
I. A. Grigor’ev ◽  
E. J. Reijerse ◽  
V. V. Khramtsov
Keyword(s):  
Ph Sensitive ◽  
Spin Probes

Molecular Design of pH-Sensitive Spin Probes in the 2,3,4,6,7,8-Hexahydro­imidazo[1,5-a]pyrimidine Series with Different Lipophilic/Hydrophilic Properties­

Synthesis ◽  
2005 ◽  
Vol 2005 (20) ◽  
pp. 3649-3653 ◽  
Author(s):  
Vadim K. Khlestkin ◽  
Vladimir V. Butakov ◽  
Igor A. Grigor’ev ◽  
Andrey A. Bobko ◽  
Valerii V. Khramtsov
Keyword(s):  
Molecular Design ◽  
Ph Sensitive ◽  
Spin Probes ◽  
Pyrimidine Series

Grignard Reagent Addition of 5-Alkylamino-4H-imidazole 3-Oxides: Synthesis of New pH-Sensitive Spin Probes.

ChemInform ◽  
2003 ◽  
Vol 34 (36) ◽  
Author(s):  
Igor A. Kirilyuk ◽  
Tikhon G. Shevelev ◽  
Denis A. Morozov ◽  
Ekaterina L. Khromovskih ◽  
Nikita G. Skuridin ◽  
...  
Keyword(s):  
Grignard Reagent ◽  
Ph Sensitive ◽  
Spin Probes

A New Series of Lipophilic pH-Sensitive Spin Probes.

ChemInform ◽  
2004 ◽  
Vol 35 (16) ◽  
Author(s):  
V. A. Reznikov ◽  
N. G. Skuridin ◽  
E. L. Khromovskikh ◽  
V. V. Khramtsov
Keyword(s):  
Ph Sensitive ◽  
Spin Probes

scholarly journals Acidic and Electrosurface Properties of Binary TiO2–SiO2 Xerogels Using EPR of pH-Sensitive Nitroxides

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 119
Author(s):  
Denis O. Antonov ◽  
Daria P. Tambasova ◽  
Andrey B. Shishmakov ◽  
Igor A. Kirilyuk ◽  
Elena G. Kovaleva
Keyword(s):  
Organic Synthesis ◽  
Electrostatic Potential ◽  
Electrical Potential ◽  
Ph Sensitive ◽  
Bulk Solution ◽  
Tio2 Content ◽  
Acid Base ◽  
Negative Surface ◽  
Further Development ◽  
Surface Electrostatic Potential

The binary xerogels TiO2–SiO2 are widely used as catalysts and their carriers in organic synthesis. Characterization and adjustment of the electrostatic properties of the surface and the local acidity inside the pores, are necessary for the further development of TiO2–SiO2 xerogels applications. This research investigates acid–base equilibria in the pores, and the surface electrostatic potential (SEP) of binary TiO2–SiO2 xerogels, by the EPR of stable pH-sensitive nitroxide radicals. These radicals are small enough to penetrate directly into the pores, and to be adsorbed onto the surface of the material under study. This makes it possible to obtain valuable information on the acidic and electrosurface properties of the studied system. The highest negative surface electrical charge associated with surface electrical potential (SEP) was equal to –196 ± 6 mV. It was induced by the surface of the sample with a 7% TiO2 content. Тhe local acidity inside the pores of this sample was found to be higher, by approximately 1.49 pH units, as compared to that in the external bulk solution.

Dielectric and Electrostatic Properties of the Silica Nanoparticle–Water Interface by EPR of pH-Sensitive Spin Probes

2019 ◽  
Vol 123 (49) ◽  
pp. 29972-29985 ◽  
Author(s):  
Vladislav Perelygin ◽  
Maxim A. Voinov ◽  
Antonin Marek ◽  
Erkang Ou ◽  
Jacqueline Krim ◽  
...  
Keyword(s):  
Silica Nanoparticle ◽  
Ph Sensitive ◽  
Water Interface ◽  
Spin Probes ◽  
Electrostatic Properties

Acid–Base Properties of Nanoconfined Volumes of Anodic Aluminum Oxide Pores by EPR of pH-Sensitive Spin Probes

2016 ◽  
Vol 120 (5) ◽  
pp. 2703-2711 ◽  
Author(s):  
Elena G. Kovaleva ◽  
Leonid S. Molochnikov ◽  
Umamaheswari Venkatesan ◽  
Antonin Marek ◽  
Darya P. Stepanova ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Ph Sensitive ◽  
Spin Probes ◽  
Acid Base ◽  
Anodic Aluminum ◽  
Base Properties

Synthesis, Structure, and X-Band (9.5 GHz) EPR Characterization of the New Series of pH-Sensitive Spin Probes: N,N-Disubstituted 4-Amino-2,2,5,5-tetramethyl-3-imidazoline 1-Oxyls

2005 ◽  
Vol 70 (24) ◽  
pp. 9702-9711 ◽  
Author(s):  
Maxim A. Voinov ◽  
Julya F. Polienko ◽  
Thomas Schanding ◽  
Andrey A. Bobko ◽  
Valery V. Khramtsov ◽  
...  
Keyword(s):  
Ph Sensitive ◽  
Spin Probes ◽  
X Band
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