SURFACE REACTIONS OF ATOMS AND RADICALS. I. A NEW APPROACH TO THE PROBLEM OF SPECIFIC SURFACE ACTION

1930 ◽  
Vol 52 (5) ◽  
pp. 1910-1918 ◽  
Author(s):  
Hugh S. Taylor ◽  
George I. Lavin
Keyword(s):  
Specific Surface ◽  
Surface Reactions ◽  
New Approach

Carbon nanomaterials based on interpolyelectrolyte complex lignosulfonate-chitosan

Holzforschung ◽  
2019 ◽  
Vol 73 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Olga Brovko ◽  
Irina Palamarchuk ◽  
Konstantin Bogolitsyn ◽  
Nikolay Bogdanovich ◽  
Artem Ivakhnov ◽  
...  
Keyword(s):  
Specific Surface ◽  
Nitrogen Content ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nanomaterials ◽  
Electron Pair ◽  
Spherical Geometry ◽  
Processing Conditions ◽  
Interpolyelectrolyte Complex ◽  
New Approach

AbstractA new approach to the formation of “fullerene-like” carbon-nitrogen carbogels based on the interpolyelectrolyte complex lignosulfonate-chitosan (IPEC LSNa-CT) was developed. It was established that carbogel maintained the morphology of the precursor complex, i.e. the spherical geometry and the particle size of its main fractions (40–55 nm) were stored in the carbonizate. The influence of pyrolysis (Py) temperature was studied in the range of 500–1000°C on the structure of carbonizate. Carbogels obtained under different processing conditions have a well-developed microporous structure. The specific surface area of carbogels reduced with increasing Py temperature according to their nitrogen content. The maximum specific surface area (438.3 m2g−1) corresponds to the carbogel obtained at 600°C, while the maximum nitrogen content of this sample is 4.4%. The internal porosity of the material and the volume of supermicropores are reduced with increasing Py temperature due to the accumulation of double and triple carbon bonds in the carbogel. Apparently, the structure-forming N-atoms participate in the formation of condensed nitrogen-containing and cyclic structures as a donor of the electron pair and as such they accelerate the carbonization process.

Specific surface reactions for identification of platinum surface domains

2005 ◽  
Vol 50 (21) ◽  
pp. 4308-4317 ◽  
Author(s):  
P. Rodríguez ◽  
E. Herrero ◽  
J. Solla-Gullón ◽  
F.J. Vidal-Iglesias ◽  
A. Aldaz ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Reactions ◽  
Platinum Surface ◽  
Surface Domains

An Assessment of some Thermal and Chemical Techniques used in the Study of the Poorly-Ordered Aluminosilicates in Soil Clays

Clay Minerals ◽  
1970 ◽  
Vol 8 (3) ◽  
pp. 325-335 ◽  
Author(s):  
J. M. Bracewell ◽  
A. S. Campbell ◽  
B. D. Mitchell
Keyword(s):  
Specific Surface ◽  
Surface Reactions ◽  
Silica Gels ◽  
Chemical Dissolution ◽  
Thermal Methods ◽  
Fluoride Uptake ◽  
Soil Clays ◽  
Chemical Techniques

AbstractThe usefulness of various techniques for characterizing poorlyordered inorganic gel systems in clays is considered. Many established instrumental techniques are unsuitable, but thermal methods, chemical dissolution techniques, and specific surface reactions are more appropriate. The reaction of fluoride with clays is used as an example of the latter and methods for detection and monitoring of the fluoride uptake are described. Its value is demonstrated for studying gel materials in soils and relating them to synthetic alumina-silica gels.

Non-Conventional Approach for Deacidification of Fumed Silica

2010 ◽  
Vol 97-101 ◽  
pp. 648-651
Author(s):  
Dong Hua Chen ◽  
Yun Ying Fan ◽  
Jin Hu
Keyword(s):  
Microwave Irradiation ◽  
Specific Surface ◽  
Fumed Silica ◽  
Fluidized Beds ◽  
Cost Effective ◽  
High Specific Surface Area ◽  
The Body ◽  
Aggregation Process ◽  
New Approach ◽  
Cost Effective Method

A fluidized beds method used in the industry for deacidification of the fumed silica has several drawbacks. The present work was intended to develop a simple, rapid and cost-effective method for the deacidification of fumed silica with high specific surface area using microwave technique. The effect of microwave irradiation on the body of the fumed silica has been investigated. The experimental results show that the microwave irradiation technique has been effective in deacidification and suppressing the aggregation process of fumed silica. This new approach may be useful to accelerate the deacidification process and avoid the aggregation growth.

scholarly journals A New Approach for Detection Improvement of the Creutzfeldt-Jakob Disorder through a Specific Surface Chemistry Applied onto Titration Well

Biosensors ◽  
2012 ◽  
Vol 2 (4) ◽  
pp. 433-447
Author(s):  
Caroline Mille ◽  
Dominique Debarnot ◽  
Willy Zorzi ◽  
Benaissa Moualij ◽  
Isabelle Quadrio ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Specific Surface ◽  
New Approach

Evolution of Modelling Zeta Potential: Impact of Brine Compositions and Concentration

2020 ◽  
Author(s):  
Miftah Hidayat ◽  
Jan Vinogradov ◽  
Stefan Iglauer ◽  
Mohammad Sarmadivaleh
Keyword(s):  
Zeta Potential ◽  
Surface Reactions ◽  
Equilibrium Constants ◽  
Stern Layer ◽  
New Approach ◽  
Low Salinity ◽  
Deep Aquifers ◽  
Wide Range ◽  
Electrical Permittivity ◽  
The Relationship

<p>Electrochemical interactions of calcite with brines in natural subsurface settings have received ample attention in the last decades due to the broad range of their applications. These interactions can be described by an electrical property termed the zeta potential. Many numerical simulation studies using surface complexation modelling (SCM) have been performed to investigate the relationship between the zeta potential and a wide range of salinities and complex brine compositions. Although most of the simulated results, especially in low salinity conditions, successfully match the experimentally measured zeta potential, the simulated zeta potential for high salinity conditions is still poorly understood.</p><p>In this study, we present a new approach of SCM to simulate the zeta potential by considering the actual molecular-scale phenomena at the calcite-brine interface. Unlike previous SCM studies, our model considers the hydrated diameter of ions as the distance of approach, which depends on salinity. We also consider the permittivity of the Stern layer as a function of salinity, which is consistent with previous unrelated studies. We calculate the capacitance for each salinity based on the relationship between the hydrated diameter of ions and the permittivity of the Stern layer. Moreover, all calcite-brine surface reactions are described by new equilibrium constants independent of salinity and composition of brines.</p><p>Our results show that the simulated zeta potential which is obtained from our SCM at a broad range of salinities is successfully matched with the published experimental data for two different carbonate rock samples as long as the salinity dependence of the hydration diameter and electrical permittivity is accounted for. We find that the potential determining ions (Ca<sup>2+</sup>, Mg<sup>2+</sup>, SO<sub>4</sub><sup>2-</sup>, HCO<sub>3</sub><sup>-</sup>,CO<sub>3</sub><sup>2-</sup>) play a dominating role compared to the indifferent ions (Na<sup>+</sup>, Cl<sup>-</sup>) in the calcite-brine surface reactions. The Implications of our findings are significant for wettability evaluation, characterisation of shallow and deep aquifers and CO<sub>2</sub> geological sequestration.</p>

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Sign in / Sign up

Export Citation Format

Share Document