Surface characterization of standard cotton fibres and determination of adsorption isotherms of fragrances by IGC

2015 ◽  
Vol 47 (11) ◽  
pp. 1040-1050 ◽  
Author(s):  
Anett Kondor ◽  
Christian Quellet ◽  
András Dallos
Keyword(s):  
Adsorption Isotherms ◽  
Surface Characterization ◽  
Cotton Fibres

Quantitative surface characterization of silicon spheres by combined XRF and XPS analysis for the determination of the Avogadro constant

Metrologia ◽  
2017 ◽  
Vol 54 (5) ◽  
pp. 653-662 ◽  
Author(s):  
Matthias Müller ◽  
Burkhard Beckhoff ◽  
Edyta Beyer ◽  
Erik Darlatt ◽  
Rolf Fliegauf ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Xps Analysis ◽  
Avogadro Constant ◽  
Silicon Spheres

X-ray photoelectron spectroscopy characterization of aerosol particles in Antarctica

2015 ◽  
Vol 27 (5) ◽  
pp. 493-499 ◽  
Author(s):  
Simona Rella ◽  
Cosimino Malitesta
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Chemical Elements ◽  
Aerosol Particles ◽  
Qualitative And Quantitative Analysis ◽  
Surface Enrichment ◽  
X Ray ◽  
Qualitative And Quantitative

AbstractQualitative and quantitative analysis of surface species on size-segregated atmospheric particulate collected in Antarctica during the 2010–11 summer was performed by X-ray photoelectron spectroscopy (XPS). This represents the first example of surface characterization of Antarctic aerosols. The size class with particle cut-off diameter of 3 μm was richest in terms of chemical elements. Peculiar findings of the application included detection of Ca (possibly surface-segregated) and surface enrichment of Mg. The determination of nitrate, ammonium and sulphate species on collection filters provides evidence for a possible advantage of XPS over more laborious techniques (e.g. ion chromatography). The presence of these species is in reasonable agreement with other recent reports from Antarctica.

scholarly journals Fabrication and surface characterization of poly(4-aminodiphenylamine) film modified electrode and its application for lead and cadmium determination

2014 ◽  
Vol 19 (1) ◽  
pp. 43
Author(s):  
Mohammed M. Al-Hinaai ◽  
Salim H. Al-Harthi ◽  
Emad A. Khudaish
Keyword(s):  
Modified Electrode ◽  
Surface Characterization ◽  
Fiber Structure ◽  
Radical Intermediate ◽  
Selective Determination ◽  
Lead And Cadmium ◽  
Environmental Sensor ◽  
Dimerization Process

Poly(4-aminodiphenylamine), Padpa, film was synthesized electrochemically on a glassy carbon electrode by potentiodynamic repetitive cycling of 4‑aminodiphenylamine (4adpa) in 1.0 M HCl. The mechanistic steps involved the oxidation of the protonated monomer to  diimine species which underwent dimerization process to form the mono-charged radical intermediate which was considered as the initiation step for the progress of polymerization. The electrochemical properties and surface morphology of the film modified electrode were characterized using electrochemical and various surface scanning techniques. The XPS data demonstrated the existence of (=N-) bonding responsible for polymer formation, while the AFM image revealed a uniform and symmetrical fiber structure with low energy dissipation. The modified electrode was primarily applied as an environmental sensor for the simultaneous and selective determination of Cd2+ and Pb2+ ions in water samples. The detection limit for Cd2+ and Pb2+ ions was found 25 and 14 mg L-1, respectively.   

scholarly journals Surface Characterization of Zn-modified H-ZSM-5 Zeolites

2020 ◽  
Vol 6 (6) ◽  
pp. 48-54
Author(s):  
M. Dziuba ◽  
L. Mushinskii ◽  
R. Brovko ◽  
V. Doluda
Keyword(s):  
Surface Properties ◽  
Adsorption Isotherms ◽  
Surface Characterization ◽  
Technical Problem ◽  
Nitrogen Adsorption ◽  
Correct Choice ◽  
Test Surface ◽  
Frequent Use ◽  
Nitrogen Adsorption Isotherms

The surface properties of microporous aluminosilicates are of primary importance in chemical technology and catalysis. The determination of the surface area, pore volume, and pore size and size distribution for microporous aluminosilicates is a complex scientific and technical problem related to both accurate measurements and the correct choice of a mathematical model that adequately describes the physicochemical processes occurring on the test surface. Currently, t-plot, as-plot, Dubinin-Radushkevich model, Dillimore model and Horvath-Kawazoe model are frequently used, each of which has certain advantages and certain disadvantages, to determine micropores in the material. It should be noted that t-plot model found the most frequent use. This is a consequence of the good correlation of volumes and pore areas obtained with its help with theoretically calculated values for various materials. In this point, the article provides a calculation of Zn-modified zeolite H-ZSM-5 surface properties using the t-plot model, for which nitrogen adsorption isotherms were originally obtained. The nitrogen adsorption isotherms of the initial zeolite H-ZSM-5 can be attributed to the first type of isotherms, and the modified samples to the fourth type of isotherms according to Brunauer’s classification. It was found that the initial zeolite is a typical microporous zeolite of H-ZSM-5 type, while the modified samples are micro- and mesoporous materials. Calculation of nitrogen adsorption isotherms using the t-plot model allows to determine the volume of micro and mesopores, which varied in the range of 0.11–0.14 cm3/g for micropores and 0.04–0.07 cm3/g for mesopores. Based on the obtained data, it can be concluded that when zeolite is modified with zinc at a zinc concentration less than 15 wt.%, micropores are not filled with zinc, while mesopores are predominantly filled and an additional surface of zinc oxide is formed on the external surface of the zeolite.

scholarly journals Contact Angle Measurement for The Surface Characterization of Solids

2011 ◽  
Vol 2 ◽  
pp. 1-4 ◽  
Author(s):  
D. P. Subedi
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Surface Characterization ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Liquid Model ◽  
Convenient Approach ◽  
Young's Equation

This paper reports a description of the theory of contact angle measurement and its use for the determination of surface energy of solids. The main objective of the work is to present a convenient approach to explain wetting phenomenon using contact angle theory. A brief review of Young’s equation and Young- Dupre equation is also presented followed by an extended Fowke’s equation widely used for the calculation of surface energy of solids. The two liquid model has been applied to determine the surface energy of polycarbonate and low density polyethylene.Key words: Contact angle; Surface energy; Surface characterization; Wettability; Young’s equation; Fowke’s modelThe Himalayan Physics Vol.2, No.2, May, 2011Page:1-4Uploaded Date: 31 July, 2011

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

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