NGHIÊN CỨU ẢNH HƯỞNG CỦA pH VÀ DUNG MÔI ETANOL ĐẾN SỰ HÌNH THÀNH CANXI HYDROXY APATIT TỪ CANXI NITRAT
STUDY OF INFLUENCES OF pH AND ETHANOL ON FORMATION OF CALCIUM HYDROXYAPATITE
The influences of different pH values and ethanol in the precipitation reaction of HA from Ca(NO3)2, (NH4)2HPO4 and NH3 were studied. The obtained samples were characterized by using methods such as XRD, FTIR, DTA/TGA and SEM. The results indicate, the pH values and ethanol play the important roles in the precipitation of single phase HA and their effectivity. Low pH values (< 7) lead to form the CaHPO4 phase, beside HA phase. The single phase HA formation can reach for the highest effectivity by 11 - 12 pH values. The high ethanol contents can also lead to CaHPO4 formation and increase the crystalline dimensions of HA particles.
Keywords. Ca10(PO4)6(OH)2, Ca(NO3)2, (NH4)2HPO4, CaHPO4.
Authors who publish with Vietnam Journal of Science and Technology agree with the following terms:
- The manuscript is not under consideration for publication elsewhere. When a manuscript is accepted for publication, the author agrees to automatic transfer of the copyright to the editorial office.
- The manuscript should not be published elsewhere in any language without the consent of the copyright holders. Authors have the right to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal’s published version of their work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are encouraged to post their work online (e.g., in institutional repositories or on their websites) prior to or during the submission process, as it can lead to productive exchanges or/and greater number of citation to the to-be-published work (See The Effect of Open Access).