Results 181 to 190 of about 8,471 (229)

The Clay Minerals Halloysite and Meta-Halloysite

Nature, 1946
X-RAY studies of these minerals in relation to (a) their reactions with organic liquids (MacEwan), (b) the effect of heat treatment (G. W. B. and K. R.) have led us to certain conclusions which can best be expressed in a joint communication. Meta-halloysite has the same formula as kaolinite, Al2Si2O5(OH)4, and from the work of Hendricks and others1 is ...
G. W. BRINDLEY, K. ROBINSON, D. M. C. MACEWAN   +2 more
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Behavior of halloysite clay under formamide treatment

Applied Clay Science, 2007
Halloysite clay minerals are ubiquitous in soils and weathered rocks where they occur in a variety of particle shapes and hydration states. When both halloysite and kaolinite are present in a given sample, differentiation between the two minerals is ...
Emmanuel Joussein, Sabine Petit, B Delvaux   +2 more
exaly   +2 more sources

Halloysite -A critical assessment

, 1990
Water enters the interlayer space in halloysite to minimize cation-cation Coulomb repulsion between adjacent layer surfaces and to coordinate exchangeable cations postulated as present to compensate for Al(IV). The layers roll into tubes due to lateral misfit between a larger tetrahedral sheet and a smaller octahedral sheet. Tetrahedral rotation, which
Bailey, Sturges W.
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Adsorption kinetics of halloysite nanotube and modified halloysite at the Palm oil-water interface and Pickering emulsion stabilized by halloysite nanotube and modified halloysite nanotube

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
Abstract In this study, the interfacial tension behavior of halloysite nanotube (HNT) as a hydrophilic nanoparticle and modified APTES-HNT as a hydrophobic nanoparticle at the palm oil-water interface was investigated. The result of this study was used to determine the stability and potential formation of Pickering emulsion as a novel dispersed ...
Pegah Sadeh, Iman Najafipour, Mohsen Gholami   +2 more
openaire   +2 more sources

Molecular dynamics of the halloysite nanotubes

Physical Chemistry Chemical Physics, 2018
Halloysite nanotube rolling was modelled using molecular dynamics.
Danil A. Prishchenko, Evgeniy V. Zenkov, Vladimir V. Mazurenko, Rawil F. Fakhrullin, Yuri M. Lvov, Vladimir G. Mazurenko   +5 more
openaire   +2 more sources

Characterisation of Halloysite by Spectroscopy

2016
This chapter provides an overview of results obtained by a variety of spectroscopic techniques. The most common techniques employed are infrared (IR) and Raman spectroscopy, which enable detailed observation of the behaviour of water and OH-groups and the type of H-bonds formed.
openaire   +4 more sources

Fabrication of halloysite@polypyrrole composite particles and polypyrrole nanotubes on halloysite templates

Journal of Applied Polymer Science, 2012
AbstractHalloysites (HNTs) core‐polypyrrole(PPy) shell composite particles were fabricated by in situ oxidative polymerization of the pyrrole monomer absorbed HNTs nanotubes, obtained by the dispersion of HNTs in acid aqueous solution of pyrrole with ultrasonic irradiation and magnetic stirring, by using ammonium persulfate as oxidant.
Yushan Liu, Haiming Nan, Qiang Cai, Hengde Li   +3 more
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Effects of acid leaching on halloysite

2015
Physicochemical Problems of Mineral Processing; ISSN 2083 ...
Saklar, Saruhan, Yorukoglu, ABDULKERİM
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Einlagerungsverbindungen in wasserarmem Halloysit

Zeitschrift für anorganische und allgemeine Chemie, 1969
AbstractAn 11 bei 110°C getrockneten Metahalloysiten wurden Einlagerungsverbindungen her‐gestellt mit Kalium‐ und Ammoniumacetat, mit Harnstoff und mit Amiden der Ameisensäure und der Essigsäure sowie mit den methylierten Amiden. Die Schichtabstände der Verbindungen Variieren zwischen 10 und 20 Å.
U. Hofmann, R. Reingraber
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Halloysite and Gibbsite Formation in Hawaii

Clays and clay minerals (National Conference on Clays and Clay Minerals), 1960
AbstractDesilication and removal of bases from the basalitic rocks of the Hawaiian Islands produces large amounts of halloysite and gibbsite, together with variable quantities of allophane and nontronite, iron and titanium oxides, and amorphous mineral and gel material.The nature and relative abundance of intermediate and end products of weathering ...
openaire   +1 more source