Results 41 to 50 of about 18,650 (253)

A comparative study of experimental configurations in synchrotron pair distribution function [PDF]

, 2019
The identification and quantification of amorphous components and nanocrystalline phases with very small crystal sizes, smaller than ~3 nm, within samples containing crystalline phases is very challenging.
Ana Cuesta, Angeles G. De la Torre, Aranda, Billinge, Clearfield, Egami, Jesus D. Zea-Garcia, Miguel A. G. Aranda, Mittemeijer, Nicoleau, Sławiński, Von Dreele, Wright   +12 more
core   +2 more sources

Coating of Gibbsite Platelets with Silica [PDF]

Chemistry of Materials, 2004
In this work, gibbsite particles are synthesized from aluminum alkoxides in an acidic environment at 85 °C. After centrifugation, coating with silica is investigated following two different methods. Practical aspects and the feasibility to produce significant amounts of material are studied. The first method, analogous to a procedure used for boehmite,
openaire   +3 more sources

Mineralogy of the clay fraction of Alfisols in two slope curvatures: III - spatial variability

Revista Brasileira de Ciência do Solo, 2013
A good knowledge of the spatial distribution of clay minerals in the landscape facilitates the understanding of the influence of relief on the content and crystallographic attributes of soil minerals such as goethite, hematite, kaolinite and gibbsite ...
Livia Arantes Camargo, José Marques Júnior, Gener Tadeu Pereira   +2 more
doaj   +1 more source

Phase stacking diagram of colloidal mixtures under gravity [PDF]

, 2013
The observation of stacks of distinct layers in a colloidal or liquid mixture in sedimentation-diffusion equilibrium is a striking consequence of bulk phase separation.
Heras, Daniel de las, Schmidt, Matthias
core   +2 more sources

Surface area, crystal morphology and characterization of transition alumina powders from a new gibbsite precursor

Materials Research, 2007
A new procedure was used to prepare a microcrystalline powder constituted by thin euhedral hexagonal gibbsite plates, 0.2 to 0.6 µm in diameter and 32 nm thick. The powder, fired between 200 and 1000 °C, produced chi and kappa transition aluminas.
Antonio Carlos Vieira Coelho, Helena de Souza Santos, Pedro Kuniiko Kiyohara, Kelly Nanci Pinto Marcos, Pérsio de Souza Santos   +4 more
doaj   +1 more source

Phosphate and fluoride removal options for Hanford high‐level waste sludge processing

Environmental Progress &Sustainable Energy, EarlyView.
Abstract High‐phosphate and high‐fluoride sludges represent some of the most challenging waste streams within the Hanford High‐Level Waste (HLW) inventory due to solubility constraints, impacts on glass loading, and corrosion risks during vitrification.
A. M. Westesen, K. J. Murray, A. A. Bachman, A. M. Robb, R. A. Peterson   +4 more
wiley   +1 more source

Efficient Adsorbent-Desiccant Based on Aluminium Oxide

Applied Sciences, 2021
The review describes the main methods of obtaining hydroxides and aluminium oxides (AO) of various structures from gibbsite. The promising techniques of obtaining AO adsorbents are discussed, namely the technique of thermal activation in the mode of ...
Eugene P. Meshcheryakov, Sergey I. Reshetnikov, Mariya P. Sandu, Alexey S. Knyazev, Irina A. Kurzina   +4 more
doaj   +1 more source

Moderate Fire Temperatures Affect the Structure of Clayey Oxisol Aggregates

Land Degradation &Development, EarlyView.
ABSTRACT Wildfires have become increasingly frequent and intense worldwide, raising concerns about their impacts on soil systems. However, the thermal responses of clay‐rich Oxisols, dominated by Fe and Al oxides, remain poorly understood. In this study, samples from the 0 to 5 cm layer of six Oxisols were subjected to controlled heating at ...
Yasmmin Tadeu Costa, Paulo Angelo Fachin, Bruno Teixeira Ribeiro, Edivaldo Lopes Thomaz, Alberto Vasconcellos Inda Junior, Nilton Curi   +5 more
wiley   +1 more source

Capacidade máxima de adsorção de fósforo relacionada a formas de ferro e alumínio em solos subtropicais Maximum phosphorus adsorption capacity as related to iron and aluminum forms in subtropical soils

Revista Brasileira de Ciência do Solo, 2010
O P é um dos macronutrientes primários essenciais para a produção vegetal. Apesar de ser o menos absorvido pelas plantas, é o mais utilizado nas adubações nos solos das regiões tropicais e subtropicais úmidas.
Cesar Crispim Vilar, Antonio Carlos Saraiva da Costa, Allan Hoepers, Ivan Granemann de Souza Junior   +3 more
doaj   +1 more source

GeAl2‐2xFe2xO3(OH)4 Nanotubes: New Electrocatalyst for Oxygen Evolution Reaction

Advanced Functional Materials, Volume 36, Issue 21, 12 March 2026.
Fe‐doped imogolite nanotubes are synthesized via a one‐step hydrothermal method with varying Fe substitution ratios x. Structural and spectroscopic analyses confirm homogeneous Fe incorporation while preserving tubular shape. Optimal doping at x = 0.05 enhances optical absorption, narrows band gap, reduces charge transfer resistance, and significantly ...
Yassine Naciri, Jian Li, Wahid Ullah, Fabien Baron, Franck Bourdelle, Stéphan Rouzière, Claire Goldmann, Erik Elkaim, Thomas Bizien, Rachid Belkhou, Delphine Vantelon, Mohamed Nawfal Ghazzal, Erwan Paineau   +12 more
wiley   +1 more source