نتایج جستجو برای: silica phosphoric acid
تعداد نتایج: 789708 فیلتر نتایج به سال:
This study investigated the relationship between solubility and chemical speciation of plant nutritional elements (K, Ca, Si) in wood ash treated with a dilute solution sulfuric acid or phosphoric acid. The diluted solutions were added to fly (FA) collected from power plant, untreated acid-treated FAs analyzed for their contents K, Si. crystalline phases identified using X-ray diffraction (XRD)...
Auto-degradation of collagen matrices occurs in resin-infiltrated dentine by the slow action of host-derived matrix metalloproteinases. As phosphoric acid-etching inactivates these endogenous enzymes, it is puzzling how hybrid layers created by simplified etch-and-rinse adhesives can degrade in vivo. This study tested the null hypothesis that there are no differences in the relative proteolytic...
The acid etching procedure represents a procedure that increases the bond strength between the etched enamel and the composite resin. The aim of this study was to evaluate the effect of ortho-phosphoric acid 37% on the morphology and composition of the enamel surface. The surfaces of four extracted teeth (two incisors and two premolars) were etched with 37% ortho-phosphoric acid solution for 15...
A solid acid membranes based on poly (vinyl alcohol) (PVA), sodium bromide (NaBr) and phosphoric acid (H3PO4) were prepared by a solution casting method. The morphological, IR, electrical and optical properties of the (PVA)0.7(NaBr)0.3(H3PO4) x M solid acid membranes where x = 0.00, 0.85, 1.7, 3.4, 5.1 M were investigated. The variation of film morphology was examined by scanning electron micro...
Separation of Phosphoric Acid and Metallic Impurities in Crude Phosphoric Acid by Solvent Extraction
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