Calcination at higher temperatures leads to the complete dehydroxylation
and formation of partially crystalline metakaolin.
The hump near 300[degrees]C in Figure 3a and near 350[degrees]C in Figure 3b can be assigned to the dehydroxylation
of gibbsite (y-Al(OH)3) present in the dawsonite sample [2, 13].
A high acid content influences the sensory parameters of the wine but also acts as a preservative and stabilizes the wine colour due to the chemical dehydroxylation
of anthocyanins in low pH conditions.
The endothermic and exothermic effects were recorded on the DSC curve and were used to determine the dehydroxylation
temperatures of different clay species.
The current debate centers around findings that high braking temperatures result in dehydroxylation
of crysotile asbestos followed by loss of morphology and transformation into fosterite and silica (17-20).
In the later step at 488[degrees]C, the dehydroxylation
of halloysites occurs .
Kaur N, Singh B, Kennedy BJ (2010) Dissolution of Cr, Zn, Cd, and Pb single- and multi-metal-substituted goethite: Relationship to structural, morphological, and dehydroxylation
From previous studies [42-44], the heat treatment of clay leads to dehydration and dehydroxylation
of the bentonite making a destruction on the clay crystals structure so that the, cation exchange capacity and surface area decreased and consequently the adsorption capacity decreased.
by the colonic microflora, absorption and further metabolism in the liver and kidney leads to the formation of benzoic acid which gets conjugated to glycine to form hippuric acid.
With increasing temperature from 295 to 1200[degrees]C no peak has been observed, except a weight loss of 6% is observed at the TGA curve in the temperature range which is assumed to be resulted gradual dehydroxylation
in hydroxyapatite powder.
The weight loss which is attributed to adsorbed water molecules, dehydroxylation
reaction and the presence of hydroxyl groups .
Bile acids are cholesterol derivatives synthesized in the liver, and they undergo extensive enterohepatic recycling and gut microbial modification, including deconjugation and dehydroxylation