Results 161 to 170 of about 1,542 (190)
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Particle tracking to reveal gelation of hectorite dispersions
The European Physical Journal E, 2008Passive microrheological techniques using particle tracking have been developed for the study of the gelation of hectorite suspensions. By following the Brownian motion of the particles, it is possible to determine the increasing caging of the particles with time, as the system gels.
H A, Houghton, I A, Hasnain, A M, Donald
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Safety Assessment of Ammonium Hectorites as Used in Cosmetics
International Journal of Toxicology, 2013The Cosmetic Ingredient Review Expert Panel (Panel) reviewed the safety of 4 ammonium hectorite compounds used in cosmetics: disteardimonium hectorite, dihydrogenated tallow benzylmonium hectorite, stearalkonium hectorite, and quaternium-18 hectorite. These ingredients function in cosmetics mainly as nonsurfactant suspending agents.
Lillian C, Becker +10 more
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The infrared spectrum of water adsorbed on hectorite
Clay Minerals, 1969The infrared spectrum of water adsorbed on K-hectorite has been studied in the frequency range 2600–4000 cm−1 on samples equilibrated with relative humidities of 0% to 100%. The model proposed by J. Mamy for the molecular array of water upon the mineral surface has been used as a starting assumption.
R. Prost, J. Chaussidon
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Superfluid double layers in hectorites
Physica B: Condensed Matter, 1994Abstract Superfluid double layers linked at a discrete set of points are investigated as a model for4He films adsorbed in hectorites. Sinks and sources are introduced as novel topological excitations added to vortices, which are proper to the films on porous media.
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Preparation and Characterization of Reduced-Charge Hectorites
Clays and Clay Minerals, 1992Abstract A series of reduced-charge (RC) hectorites were prepared by multiple heat (250°C) treatments of Mg-saturated hectorites (SHCa-1 ). Cation exchange capacity (CEC) measurements and alkylammonium exchange indicated that a decrease in layer charge occurred with each Mg-250 treatment.
William F. Jaynes +3 more
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The Chemisorption of Anisole on Cu(II) Hectorite
Clays and Clay Minerals, 1973AbstractThe sorption of anisole and some related aromatic ethers on the interlamellar surfaces of Cu(II) hectorite has been investigated by i.r. and e.s.r. spectroscopy. In addition to physical adsorption, anisole forms two distinct types of Cu(II) complexes which are analogous to the type I and II species previously reported for benzene-Cu(II ...
D. B. Fenn +2 more
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Clay Minerals, 1968
AbstractThe heavy metal cations studied were adsorbed by hectorite suspended in 0.05 M calcium chloride as a pH-dependent reaction in the order, Cu > Zn > (Co, Mn) > Ni. The adsorption of heavy metal cations was accompanied by the removal from solution of silicic acid released by clay dissolution.
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AbstractThe heavy metal cations studied were adsorbed by hectorite suspended in 0.05 M calcium chloride as a pH-dependent reaction in the order, Cu > Zn > (Co, Mn) > Ni. The adsorption of heavy metal cations was accompanied by the removal from solution of silicic acid released by clay dissolution.
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Photochromism of a Spiropyran in the Presence of a Synthetic Hectorite
Chemistry Letters, 2018The photoinduced reaction in a system consisting of a photochromic spiropyran and a synthetic hectorite in toluene was examined. The photomerocyanine formed from spiropyran was adsorbed on the hectorite from toluene solution and the desorption of the adsorbed merocyanine from the hectorite as spiropyran was induced by visible light irradiation.
Tetsuo Yamaguchi, Makoto Ogawa
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The Pillaring of A Synthetic Hectorite With Organic Cations
1989Abstract Thermal analysis, X-ray diffraction (XRD) measurements, transmission electron microscopy (TEM), and 29 Si MASNMR together with 13 CPMAS spectroscopy have been used to characterize several organo-clays prepared by pillaring a synthetic hectorite (Laponite) with large monovalent cations.
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