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Author

Pedro José Sánchez-Soto

Other affiliations: University of Seville
Bio: Pedro José Sánchez-Soto is an academic researcher from Spanish National Research Council. The author has contributed to research in topics: Differential thermal analysis & Pyrophyllite. The author has an hindex of 26, co-authored 127 publications receiving 2045 citations. Previous affiliations of Pedro José Sánchez-Soto include University of Seville.


Papers
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TL;DR: In this paper, the effects of dry grinding on the structure of well-crystallized and poorly crystallized (KGa-1 and KGa-2) kaolinite powders from Georgia were examined.
Abstract: The present study examined the effects of dry grinding, using ball-milling, on the structure of reference well-crystallized (KGa-1) and poorly crystallized (KGa-2) kaolinite powders from Georgia. Grinding produced a strong structural alteration, mainly along the c axis, resulting in disorder and total degradation of the crystal structure of the kaolinite and the formation of an amorphous product. The surface area increased with grinding time, mainly in KGa-2 (maximum value 50.27 m 2 /g), a result associated with particle-size reduction. These particles became more agglomerated with grinding, and the surface area decreased after 30 min, as confirmed by scanning electron microscopy and particle-size-distribution analysis. There was a limit to particle-size reduction with grinding time. When grinding time was increased, the original endothermic differential thermal analysis (DTA) effects of dehydroxylation in both samples shifted to lower temperatures, decreased in intensity, then disappeared completely after 120 min of grinding. The temperature of the characteristic first exothermic effect shifted slightly to lower temperatures with grinding, although the DTA effects did not increase with grinding time in either kaolinite sample, at least up to 325 min. The amorphous, mechanically activated kaolinite converted into low-crystalline mullite nuclei at a lower temperature than did the unground samples, as deduced by thermal and X-ray observations. This effect was especially important for the KGa-2 sample. Grinding did not seem to influence the formation of silicon-aluminum spinel from kaolinite. The present results may explain why ground kaolinite samples prepared via different routes-e.g., with differences in grinding-behave differently during high-temperature transformations, as reported in the related literature.

122 citations

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TL;DR: In this paper, the contribution of airborne Saharan dust to soil development in northeastern Gran Canaria was quantified using aeolian dust collected weekly at different altitudes and distances from the coast during a year in a series of collection plots.

102 citations

Journal ArticleDOI
TL;DR: The effect of dry grinding on the structure, particle size and shape of talc from Puebla de Lillo (Leon, Spain) was studied by means of nitrogen adsorption, XRD, DTA-TG and by SEM-EDS methods.

98 citations

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TL;DR: In this article, the influence of the amount of Galvanic sludge wastes (GSW) was evaluated after firing three types of raw clay (red, yellow and black) in equal parts with GSW.

88 citations

Journal ArticleDOI
TL;DR: In this paper, the use of coal fly ash (CFA) as raw material for the manufacture of two construction materials, fired clay bricks and silica-calcareous non-fired bricks, was investigated.

78 citations


Cited by
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Journal ArticleDOI
TL;DR: The historical background and definitions of the various systems including eutectic mixtures, solid dispersions and solid solutions, as well as the production, the different carriers and the methods used for the characterization of solid dispersion are outlined.

2,695 citations

Journal ArticleDOI
TL;DR: Commercial use of solid dispersion systems during the past four decades has been very limited, primarily because of manufacturing difficulties and stability problems, but this has been changing in recent years because of the availability of surface-active and self-emulsifying carriers and the development of technologies to encapsulate solid dispersions directly into hard gelatin capsules as melts.

1,730 citations

Book
12 Mar 2014
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Abstract: In the laser treatment of a workpiece (9), e.g. for surface hardening, melting, alloying, cladding, welding or cutting, the adverse effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1). The two beams (1)(5) may be combined by a beam coupler (4) or may reach the workpiece (9) by separate optical paths (not shown). The shorter wavelength beam (1) improves the coupling efficiency of the higher- powered laser beam (5).

1,539 citations

Journal ArticleDOI
TL;DR: In this article, the PAN fiber is first stretched and simultaneously oxidized in a temperature range of 200-300°C and then carbonized at about 1000°C in inert atmosphere which is usually nitrogen.

1,166 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the working principle of phase change materials and their applications for smart temperature-regulated textiles is presented, followed by an account of incorporation of PCM in the textile structure are summarized.

982 citations