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Articles, 14 records found
Articles 14 records found  1 - 10next  jump to record:
1.
11 p, 467.8 KB Quantitative phase analysis of bentonites by the rietveld method / Ufer, K. (TU Bergakademie Freiberg. Institute of Mineralogy) ; Stanjek, H. (RWTH Aachen University. Clay and Interface Mineralogy) ; Roth, G. (RWTH Aachen University. Institute of Crystallography) ; Dohrmann, Reiner (BGR/LBEG) ; Kleeberg, R. ; Kaufhold, Stephan (BGR/LBEG)
Thirty six bentonite samples from 16 different locations were examined in order to demonstrate the applicability of a new Rietveld description approach for quantitative phase analysis. X-ray diffraction patterns of the bulk material were obtained and analyzed by the Rietveld method. [...]
2008 - 10.1346/CCMN.2008.0560210
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 272-282  
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2.
7 p, 288.0 KB Comparison of the traditional Enslin-Neff method and the modified dieng method for measuring water-uptake capacity / Kaufhold, Stephan (BGR Bundesanstalt fur Geowissenschaften und Rohstoffe) ; Dohrmann, Reiner (LBEG Landesamtfür Bergbau. Energie und Geologie)
A method for the determination of the water-uptake capacity of powders which is said to be applicable to viscose silk, specific celluloses, soap, paint, glue, gelatine, adhesives based on starch, biological samples, and soils, was proposed by Enslin in 1933 and has been improved several times since then. [...]
2008 - 10.1346/CCMN.2008.0560609
Clays and Clay Minerals, Vol. 56, Núm. 6 (2008) , p. 686-692  
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3.
10 p, 1.3 MB Quantification of allophane from Ecuador / Kaufhold, Stephan (BGR Bundesanstalt für Geowissenschaften und Rohstoffe) ; Ufer, Kristian (Institute of Mineralogy. TU Bergakademie Freiberg) ; Kaufhold, Annette (Martin-Luther-University Halle-Wittenberg. Institute for Soil Sciences and Plant Nutrition) ; Stucki, Joseph W. (University of Illinois. Department of Natural Resources and Environmental Sciences) ; Anastácio, Alexandre S. (University of Illinois. Department of Natural Resources and Environmental Sciences) ; Jahn, Reinhold (Martin-Luther-University Halle-Wittenberg. Institute for Soil Sciences and Plant Nutrition) ; Dohrmann, Reiner (LBEG Landesamt für Bergbau, Energie und Geologie)
Allophane is a very fine-grained clay mineral which is especially common in Andosols. Its importance in soils derives from its large reactive surface area. Owing to its short-range order, allophane cannot be quantified by powder X-ray diffraction (XRD) directly. [...]
2010 - 10.1346/CCMN.2010.0580509
Clays and Clay Minerals, Vol. 58, Núm. 5 (2010) , p. 707-716  
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4.
10 p, 1.8 MB A new massive deposit of allophane raw material in Ecuador / Kaufhold, Stephan (BGR Bundesanstalt für Geowissenschaften un Rohstoffe) ; Kaufhold, Annette (Martin-Luther-University Halle-Wittenberg. Institute for Soil Sciences and Plant Nutrition) ; Jahn, Reinhold (Martin-Luther-University Halle-Wittenberg. Institute for Soil Sciences and Plant Nutrition) ; Brito, Salomón (SGN Servicio Geológico Nacional) ; Dohrmann, Reiner (LBEG Landesamt für Bergbau Energie und Geologie) ; Hoffmann, Reiner (BGR Bundesanstalt für Geowissenschaften un Rohstoffe) ; Gliemann, Hartmut. (ITC-WGT. Abteilung Nanomineralogie. Forschungszentrum Karlsruhe) ; Weidler, Peter (ITC-WGT. Abteilung Nanomineralogie. Forschungszentrum Karlsruhe) ; Frechen, Manfred (GGA. Institut für Geowissenschaftliche Gemeinschaftsaufgaben)
In Ecuador, DINAGE (known today as the Servicio Geológico Nacional) and the German Federal Institute for Geosciences and Natural Resources have discovered a huge allophane deposit covering an area of >4000 km. [...]
2009 - 10.1346/CCMN.2009.0570107
Clays and Clay Minerals, Vol. 57, Núm. 1 (2009) , p. 72-81  
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5.
15 p, 596.2 KB Three new, quick CEC methods for determining the amounts of exchangeable calcium cations in calcareous clays / Dohrmann, Reiner (BGR/LBEG) ; Kaufhold, Stephan (BGR/LBEG)
The cation exchange capacity (CEC) is one of the most important properties of clays in terms of their performance in both natural and technical processes. For decades, common methods for determining exchangeable cations have failed when calcareous clays or soils were examined, because calcite is at least partly dissolved throughout the exchange experiment which in turn increases measureable Ca concentrations. [...]
2009 - 10.1346/CCMN.2009.0570306
Clays and Clay Minerals, Vol. 57, Núm. 3 (2009) , p. 338-352  
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6.
14 p, 888.1 KB Interlaboratory CEC and exchangeable cation study of bentonite buffer materials : I. Cu(II)-triethylenetetramine method / Dohrmann, Reiner (Bundesanstalt für Geowissenschaften und Rohstoffe) ; Genske, Dieter (S and B Industrial Minerals GmbH) ; Karnland, Ola (Clay Technology AB. IDEON Research Center) ; Kaufhold, Stephan (Bundesanstalt für Geowissenschaften und Rohstoffe) ; Kiviranta, Leena (BTech Oy) ; Olsson, Siv (Clay Technology AB. IDEON Research Center) ; Plötze, Michael (ETH Zürich. Institute for Geotechnical Engineering) ; Sandén, Torbjörn (Clay Technology AB. IDEON Research Center) ; Sellin, Patrik (Swedish Nuclear Fuel and Waste Management Co) ; Svensson, Daniel (Swedish Nuclear Fuel and Waste Management Co) ; Valter, Martin (ETH Zürich. Institute for Geotechnical Engineering)
Bentonites are candidate materials for encapsulation of radioactive waste. The cation exchange capacity (CEC) has proved to be one of the most sensitive parameters for detecting changes of mineral properties such as swelling capacity and illitization in alteration experiments. [...]
2012 - 10.1346/CCMN.2012.0600206
Clays and Clay Minerals, Vol. 60, Núm. 2 (2012) , p. 162-175  
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7.
10 p, 375.0 KB Interlaboratory CEC and exchangeable cation study of bentonite buffer materials : II. alternative methods / Dohrmann, Reiner (Bundesanstalt für Geowissenschaften und Rohstoffe) ; Genske, Dieter (S and B Industrial Minerals GmbH) ; Karnland, Ola (Clay Technology AB. IDEON Research Center) ; Kaufhold, Stephan (Bundesanstalt für Geowissenschaften und Rohstoffe) ; Kiviranta, Leena (BTech Oy) ; Olsson, Siv (Clay Technology AB. IDEON Research Center) ; Plötze, Michael (ETH Zürich. Institute for Geotechnical Engineering) ; Sandén, Torbjörn (S and B Industrial Minerals GmbH) ; Sellin, Patrik (Swedish Nuclear Fuel and Waste Management Co) ; Svensson, Daniel (Swedish Nuclear Fuel and Waste Management Co) ; Valter, Martin (ETH Zürich. Institute for Geotechnical Engineering)
Bentonites are candidate materials for encapsulation of radioactive waste. The cation exchange capacity (CEC) has proven to be one of the most sensitive parameters for detecting changes in mineral properties in bentonite-alteration experiments. [...]
2012 - 10.1346/CCMN.2012.0600207
Clays and Clay Minerals, Vol. 60, Núm. 2 (2012) , p. 176-185  
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8.
18 p, 1.8 MB Rietveld refinement of disordered illite-smectite mixed-layer structures by a recursive algorithm. II : Powder-pattern refinement and quantitative phase analysis / Ufer, Kristian (BGR/LBEG) ; Kleeberg, Reinhard (Institute of Mineralogy. TU Bergakademie Freiberg) ; Bergmann, Jörg ; Dohrmann, Reiner (BGR/LBEG)
X-ray diffraction (XRD) of powdered materials is one of the most common methods used for structural characterization as well as for the quantification of mineral contents in mixtures. The application of the Rietveld method for that purpose requires structure models for each phase. [...]
2012 - 10.1346/CCMN.2012.0600508
Clays and Clay Minerals, Vol. 60, Núm. 5 (2012) , p. 535-552  
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9.
6 p, 331.7 KB The pH of aqueous bentonite suspensions / Kaufhold, Stephan (BGR Bundesanstalt für Geowissenschaften und Rohstoffe) ; Dohrmann, Reiner (LBEG Landesamt für Bergbau Energie und Geologie) ; Koch, Dietrich (S and B Industrial Minerals) ; Houben, Georg (BGR Bundesanstalt für Geowissenschaften und Rohstoffe)
The pH of aqueous bentonite suspensions is known to be influenced by carbonates present even in minor amounts. On the other hand, at high solid:liquid ratios (at standard pH measurement conditions: 2% w/w suspension), the type of exchangeable cation in the smectite is also known to determine pH (particularly Na or Ca). [...]
2008 - 10.1346/CCMN.2008.0560304
Clays and Clay Minerals, Vol. 56, Núm. 3 (2008) , p. 338-343  
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10.
9 p, 1.6 MB Variation of preferred orientation in oriented clay mounts as a result of sample preparation and composition / Dohrmann, Reiner (Landesamt für Bergbau, Energie und Geologie (LBEG)) ; Rüping, K. B. (University of Halle-Wittenberg. Institute of Agricultural and Nutritional Sciences) ; Kleber, M. (Oregon State University. Department of Crop and Soil Science) ; Ufer, K. (TU Bergakademie Freiberg. Institute of Mineralogy) ; Jahn, Reinhold (University of Halle-Wittenberg. Institute of Agricultural and Nutritional Sciences)
In X-ray diffraction (XRD) analysis, preparation of oriented clay specimens enhances their 00l reflections by arranging basal surfaces parallel to the specimen surface. In one-dimensional modeling of XRD intensities, degree of preferred orientation is one of the variable parameters and a user may choose different s* values for different minerals. [...]
2009 - 10.1346/CCMN.2009.0570602
Clays and Clay Minerals, Vol. 57, Núm. 6 (2009) , p. 686-694  
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