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Synthesis and selected physicochemical properties of hydroxyapatite and white clay composite

Broda Ewa, Skwarek Ewa, Payentko Victoria V., Gunko Vladimir M.

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 6

1475--1483

Hydroxyapatite (HAP) composites are very important biomaterials, which can be applied in various life areas. HAP composite with white clay was prepared and studied using X-ray diffraction, nitrogen adsorption, Fourier transform infrared spectroscopy (FTIR), potentiometric titration, and quasi-elastic light scattering and zeta potential measurements. The values of pHpzc (point of zero charge) and pHIEP (isoelectric point) which characterize the electrical double layer depend strongly on the white clay addition to HAP. Comparative studies of hydroxyapatite, white clay and composite using nitrogen adsorption and FTIR methods showed that in most cases composite has the properties nearly intermediate between hydroxyapatite and white clay taken for the synthesis; however, certain non- additivity was observed analyzing the properties, due to precipitation of HAP onto clay particles that changes the HAP formation conditions in comparison to HAP formation alone. Thus, changes in the condition of the composite preparation allow one to control the properties of the final materials.

Metody badania kompostów i mieszanek kompozytowych

Augustyniak-Olpińska E.

Laboratorium - Przegląd Ogólnopolski

2006

nr 12

23--25

Podczas trwania całego procesu kompostowania prowadzi się badania, których celem jest monitoring przebiegu poszczególnych faz oraz ewentualna korekta parametrów jednostkowych. W procesie tym można wyróżnić trzy fazy, w których kontrolowane są wskaźniki fizyczne, chemiczne, mikrobiologiczne i sanitarne oraz organoleptyczne. Prowadzi się także testy roślinne, których zadaniem jest określenie przydatności dojrzałego kompostu do wykorzystania.

During the whole process of composting some examinations are conducted in order to monitor the particular stages of this process and possibly correct the unit parameters. Three stages can be distinguished in this process where physical, chemical, microbiological, sanitary and organoleptic indicators are controlled. The plant tests are conducted as well. They are to determine whether the mature compost can be applied.