Search results

In Situ Structure-Sensitive Studies of Metal-Hydrogen Interactions by Scanning Kelvin Probe B.
SPETs allow characterization of the local structure and properties of surfaces and interfaces as well as corrosion and localized electrochemical events on the micro- to subnanometer scale, opening up the possibility to perform physical, chemical, and biological experiments on individual nanoscale objects.
Because only few techniques allow in situ structure-sensitive studies of electrochemical interfaces, SPETs methods were strongly embraced and have significantly contributed to a combined true microscopic picture of electrode surfaces and electrochemical processes since their introduction at the end of the 1980s of the last century.
Summary SKP is an unique tool which allows to perform in situ structure-sensitive studies of metal-hydrogen interactions which are of a key importance for many research fields in electrochemistry, corrosion and materials science.
Trefilov (Eds.): Hydrogen Materials Science and Chemistry of Metal Hydrides, NATO Science Series, Proc. of the NATO Advanced Research Workshop on Hydrogen Materials Science and Chemistry of Metal Hydrides, Alushta, Crimea, Ukraine, 16-22 September 2001, Vol. 82, Kluwer Academic Publishers, Dordrecht, The Netherlands

Pore Structure and Thermal Characteristics of Clay Bricks Monika Čáchová1, a *, Dana Koňáková1,b, Eva Vejmelková1,c, Martin Keppert1,d, Kirill Polozhiy1,e and Robert Černý1,f 1Czech Technical University in Prague – Faculty of Civil Engineering – Department of Materials Engineering and Chemistry, Thákurova 7, 166 29 Prague 6, Czech Republic amonika.cachova@fsv.cvut.cz, bdana.konakova@fsv.cvut.cz, ceva.vejmelkova@fsv.cvut.cz, dmartin.keppert@fsv.cvut.cz, ekirill.polozhiy@fsv.cvut.cz, fcernyr@fsv.cvut.cz Keywords: clay brick, basic physical properties, pore system characteristics, thermal properties Abstract.
Brick materials always have porous structure and typical red, red-brown and ochre colors.

The influences of synthesis conditions on the structure were also studied.
An intense diffraction (100) peak together with additional (110) and (200) peak, characteristic of hexagonal ordered MCM41 structure [1], was obviously observed.
With the addition of VC, the (100) peak became sharp and moved to lower angle, which revealed that the orderliness of mesoporous structure increased.
However, the mesoporous structure became worm-like for the sample with Co/Si molar ratio of 0.15 and collapsed as Co/Si molar ratio higher than 0.20.
With the increase of aging temperature, the diameter of the spheres decreased and the regularity of mesoporous structure were enhanced.

Nitrogen adsorption and scanning electric microscope (SEM) have been used to investigate the pore structure and morphology of the samples.
Recently, template method has been paid great attention because it can control the pore structure efficiently of the templated carbons [3].
The pore structures and the effects of the carbon sources on the pore structure of the templated carbons have been investigated in detail.
The pore structures of the samples were characterized by using nitrogen adsorption at 77K (ASAP 2010M, Micromeritics).
Pore structure and morphology of carbons.

The results showed that the majority of the silicon atomic chains were symmetrical structures.
In Fig. 1, Sin atomic chains are centrosymmetric structures by the midpoint of each chain.
The results show that the most silicon atomic chains are symmetrical structures.
When the silicon atomic chains have seven or more silicon atoms, tortuous structure occurs.
The Journal of Physical Chemistry C, 2011, 115(28): 13901-13906

The solution chemistry that develops inside pits has a low pH and high chloride ion concentration.
If, for some reason, this solution chemistry is disturbed, pit propagation stops and repassivation occurs.
In addition to the chemistry of the aqueous test solutions, microstructural parameters also dictate the pit initiation process.
The polarization curve and the structure revealed after the test are shown in Figs. 4e and f.
The polarization curve is shown in Fig. 4g and the structure revealed after the test is shown in Fig. 4h.

Structure and Phase Transformations upon Carburisation of High-Speed Steel A.S.
The steel microstructure and the chemistry of the carbides were examined with a scanning electron microscope equipped with a microprobe attachment.
Such cast fine-grained structure of a ferritic matrix is due to several factors.
Due to these processes, the structure becomes more uniform (Fig. 1b).
However, only weak traces of NbC were observed in the steel structure (Table 1).

In addition, the crystalloid and crystal structure of geopolymer was analyzed by XRD and FTIR.
Compressive strength of concrete (Unit: MPa) MBA Slag Sand Aggregate Activator 1 1 2 pH 13.0 60 wt% 40 wt% compressive strength 3 days 7 days 26.7 32.4 FTIR analysis FTIR absorption spectroscopy is a well known method for coupling structure analysis in materials.
Journal of Hazardous Materials 151 : 585-593 [3] Geopolymer chemistry & Applications [4] Maholtra (2002) Introduction-Sustainabgle development and concrete technology.
Construction and Buildiing Material 22 : 1939-1949 [6] Phair, J.W., Van Deventer, J.S.J., Smith, J.D., (2000) Mechanism of polysialation in the incorporation of zirconia into fly ash-based geopolymers, Industrial and Engineering Chemistry Research : 2925–2934 [7] J.S.J.

The changes of the surface funtional groups, chemical compositions and structures of the carbon fibers were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR),surface morphology was studied by scanning electron microscopy (SEM), mechanical interfacial properties of the composites was evaluated by means of interlaminar shear strength (ILSS) tests.
SEM, XPS and FTIR characterisation methods were used to investigate surface morphology and surface chemistry respectively and short beam shear test was used to investigate ILSS.
(eV) 284,52 285,40 286,270 287,72 292,03 P.C. (%) 50.3 21.8 2.3 24.5 1.1 Peak Assignment -C-C -C-H -C-OH -C-OR -C=O -COOH -COOR plasmon FTIR spectrum result of the chromate treated carbon fiber can be seen in Fig.3, Bands at 3216 cm-1 attributed to hydroxyl groups in alcohol whereas 3442 cm-1 were attributed to hydroxyl groups in acid, 2917 cm-1 band value is alkane C-H bonds are fairly ubiquitous and therefore usually less useful in determining structure, absorbtion value at 1633 cm-1 shows C=O stretching vibrations of carboxyl groups, band at 1259 cm-1 shows acyl and phenyl C-O bonds whereas 1090 cm-1 were attributed to C-O bonds present alkoxy C-O.
Chehimi, The surface chemistry and acid–base properties of a PAN-based carbon fibre, Carbon 38 (2000) 675–689

Electrochemical synthesis and photovoltaic properties of polythiothene/CdSe double layers electrode Liping HAO 1, Haijun NIU 1,a*, Lina HAO1, Xuduo BAI 1, Wen WANG 2 1.Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education, Key laboratory macromolecular chemistry, Heilongjiang University, Harbin, 150080, P R China 2.Institute of Advanced Ceramic, School of Material Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P R China; a haijunniu@hotmail.com *corresponding author Keywords: modified electrode; electrodeposition; dyes sensitized solar cell; polythiophene Abstract.
The chemical structure of the obtained polymer was characterized by FT-IR, Raman, X-ray diffraction, UV-vis spectroscopy.
And the polymerization products were used for chemical structure analysis and electrochromic study.