Results 11 to 20 of about 3,253 (216)

Trioctahedral entities in palygorskite: Near-infrared evidence for sepiolite-palygorskite polysomatism [PDF]

European Journal of Mineralogy, 2011
The mixed dioctahedral-trioctahedral character of Mg-rich palygorskite has been previously described by the formula yMg5 Si8 O20(OH)2(OH2)4(1–y)[xMg2Fe2(1–x)Mg2 Al2] Si8 O20(OH)2(OH2)4, where y is the trioctahedral fraction of this two-chain ribbon ...
Gionis, Vassilis, Emilia García-Romero, George H. Kacandes, Sánchez del Río, Manuel, Chryssikos, Georgios D., Vassilis Gionis, García Romero, Emilia, Mercedes Suárez, Súarez Barrios, Mercedes, Kacandes, Georges H., Stathopoulou, Elizabeth T., Manuel Sánchez Del Río, Georgios D. Chryssikos, Elizabeth T. Stathopoulou   +13 more
core   +7 more sources

Palygorskite in caves and karsts: a review [PDF]

Acta Carsologica, 2018
Palygorskite is fibrous mineral representing the transitional phase between chain silicates and layer silicates with modulated phyllosilicate structure.
Pavel Bosák, Nadja Zupan Hajna
doaj   +4 more sources

The difference of thermal stability between Fe-substituted palygorskite and Al-rich palygorskite [PDF]

Journal of Thermal Analysis and Calorimetry, 2013
Sedimentary palygorskite (SP) and hydrothermal palygorskite (HP) were characterized by XRF, TG/DSC, andXRD. The total iron and dissociative iron in palygorskite were detected using spectrophotometry.
Chang, Dongyin, Chen, Dong, Liu, Haibo, Chen, Tianhu, Xie, Jingjing, Qing, Chengsong, Frost, Ray L.   +6 more
core   +3 more sources

On the chemical composition of sepiolite and palygorskite [PDF]

Clays and Clay Minerals, 2010
Altres ajuts: CICYT/CGL2006-09843Many studies of the chemical composition of sepiolite and palygorskite have been carried out using analytical electron microscopy (AEM).
García-Romero, E., Súarez Barrios, Mercedes, Suárez, M., García Romero, Emilia   +3 more
core   +6 more sources

The surface energy of palygorskite [PDF]

Powder Technology, 2007
An average value for the surface energy (γ-S) of palygorskite was determined from experimental data of spreading pressure, the surface tension of water and its contact angle using a formula based on the combination of the Young equation with a general ...
de Bussetti, Silvia G., Helmy, Ahmed K., Ferreiro, Eladio Avelino   +2 more
core   +3 more sources

Enhanced Viscosity of Aqueous Palygorskite Suspensions through Physical and Chemical Processing [PDF]

Advances in Materials Science and Engineering, 2015
Palygorskite has remarkable rheological properties and was used to increase the stability and viscosity of aqueous suspensions. The effects of different physical and chemical processing methods on the apparent viscosity and plastic viscosity of the ...
Feng-shan Zhou, Tian-qi Li, Yun-hua Yan, Can Cao, Lin Zhou, Yang Liu   +5 more
doaj   +2 more sources

Octahedral cation distribution in palygorskite [PDF]

American Mineralogist, 2009
The OH speciation of 18 palygorskite samples from various localities were evaluated by near infrared spectroscopy (NIR) and compared to the corresponding octahedral composition derived from independent, single-particle analytical electron microscopy (AEM)
Súarez Barrios, Mercedes, Gionis, Vassilis, Kacandes, Georges H., Chryssikos, Georgios D., Sánchez del Río, Manuel, Stathopoulou, Elizabeth T., García Romero, Emilia   +6 more
core   +4 more sources

A Biotechnological Approach to Enzyme-Based Fertilisers: Immobilisation of Acid Phosphatases. [PDF]

Microb Biotechnol
The immobilization performance of M2‐32 varied with clay type, with palygorskite providing the highest catalytic reaction and stability. After immobilization, the enzyme preserved its broad pH and temperature tolerance. Neither the free nor the immobilized protein produced measurable changes in the rhizosphere microbial diversity.
Recio MI, de la Torre J, Rocha-Martin J, de la Mata I, Ramos JL.   +4 more
europepmc   +2 more sources

Paleoenvironmental Stasis for the Bioturbating Community During the Paleocene-Eocene Thermal Maximum at the Southern Iberian Margin. [PDF]

Geobiology
ABSTRACT During the Paleocene‐Eocene Thermal Maximum (PETM), there was an increase in global temperatures and emissions of isotopically depleted carbon, resulting in a negative carbon isotope excursion (CIE). This climatic event caused a widespread ocean deoxygenation, leading to substantial biotic turnover.
Miguez-Salas O, Rodríguez-Tovar FJ, Pujalte V.   +2 more
europepmc   +2 more sources

Clays for Low-Carbon Cements: Overview, Progress, and Challenges. [PDF]

Glob Chall
This review provides a critical overview of recent developments of activated clays to function as artificial pozzolans. After a thorough description of the clays that yield good pozzolanic performances, selected examples are given on thermal and mechanical activations. Chiefly, general correlations are extracted from reported data despite its scattered
Koufany I, Santacruz I, De la Torre AG, Rodríguez-Ruiz MD, Aranda MAG.   +4 more
europepmc   +2 more sources