Topic
Kaolinite
About: Kaolinite is a research topic. Over the lifetime, 8545 publications have been published within this topic receiving 224537 citations. The topic is also known as: myelin.
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TL;DR: In this paper, a series of CH 4 adsorption experiments on clay-rich rocks were conducted at 35, 50, and 65°C and at CH 4 pressure up to 15 MPa under dry conditions.
518 citations
TL;DR: In this article, surface samples from abyssal sediments of the South Atlantic, from parts of the equatorial Atlantic, and of the Antarctic Ocean, were investigated for clay content and clay mineral composition.
480 citations
TL;DR: The equilibrium H- and O-isotope fractionation of clays can be approximated by the following equations which are based on experimental, empirical and/or theoretical data.
Abstract: The equilibrium H- and O-isotope fractionations can be approximated by the following equations which are based on experimental, empirical and/or theoretical data: Hydrogen: 1000 In ~kaolinite-water ~" -2.2 x 106 X T -2 - 7.7 Oxygen: 1000 In ~kaolinite-water = 2.76 x 106 _ 6.75 1000 In (~smectite-water = 2.55 x 106x T -2 - 4.05 1000 In ~illite-water = 2.39 X 106 T -2 - 3.76 The equilibrium H-isotope fractionation factors vs. 106 T -2 for kaolinite and probably smectite and illite are monotonic curves between 350-0~ More complex curves, with a minimum fractionation near 200~ are probably influenced by surface effects and/or disequilibrium fractionations among the different hydrogen sites. The H-isotope fractionations between smectite-water increase by 70% from Fe-poor montmorillonite to nontronite at low temperatures. The pore-interlayer water in smectite H-isotope fractionation at low temperatures is ~20__+ 10%. The presence of organic matter can modify both the ~SD value of the clay analysis and its 'water' content. Clays -- kaolinite, illite, smectite and probably halloysite -- tend to retain their D/H and 180/160 ratios unless subjected to more extreme diagenetic or metamorphic conditions or special local processes. Kinetic information is still only qualitative: for comparable grain sizes, hydrogen exchanges more rapidly than oxygen in the absence of recrystallization. Low-temperature diffusion coefficients cannot be calculated with sufficient precision from the higher temperature exchange data. The H- and O-isotope studies of clays can provide useful information about their conditions of formation.
478 citations
TL;DR: In this paper, the effect of mineralogy on the pozzolanic activity of fired kaolin was investigated using X-ray diffraction (XRD), differential thermal analysis (DTA) and IR spectroscopy.
477 citations
TL;DR: Tombacz et al. as mentioned in this paper performed a similar study on 1:1 type kaolinite obtained from Zettlitz kaolin and showed that the pH-dependent charge formation was similar, positive charges in the protonation reaction of (Si-O) Al-OH sites formed only at pHs below ∼ 6-6.5, considered as the point of zero net proton charge (PZNPC) of kaolin particles.
472 citations