porous hydroxyapatite
Recently Published Documents


TOTAL DOCUMENTS

807
(FIVE YEARS 97)

H-INDEX

62
(FIVE YEARS 7)

2021 ◽  
Author(s):  
Ting Zeng ◽  
Yujie Yan ◽  
Juan Shen ◽  
Ke Chen ◽  
Mi Tang ◽  
...  

Abstract More and more new materials have been developed, but the research on the development and utilization of the single-phase materials has been neglected. Assembled from nano-particles, a high specific surface area and porous hydroxyapatite (BI-HA) has been synthesized by feasible bacterial induction. The surface structure and morphology of the nanocomposites were characterized by Brunauer–Emmett–Teller (BET) apparatus, X-ray diffraction (XRD), transmission electron microscopy (TEM). The results suggest the obtained BI-HA powder with porous morphology, which were composed of nanoparticles with (100) crystal plane. The photoactivity of different HA samples was evaluated by the photocatalytic degradation of tetracycline hydrochloride (TC). The HA with (100) crystal plane displayed an obviously enhanced photocatalytic activity (75.33–86.43% for 60 min). Combined with experiments and DFT calculations, for the BI-HA with (100) crystal plane, it displayed better photocatalytic performance for photodegradation of TC. This study provides a viewpoint to fabricate high-performance nonmetal photocatalyst for wastewater treatment.


2021 ◽  
Vol 2 (2) ◽  
pp. 40
Author(s):  
Fardatul Azkiyah ◽  
Drs. Djony Izak Rudyardjo, M.Si. ◽  
Jan Ady

Research on the synthesis and characterization of porous hydroxyapatite with the addition of ZnO nanoparticles has been carried out through a combination of foam immersion and injection methods. This research was conducted to optimize the previous research by increasing the variation of ZnO composition and adding the injection method to the research process. The materials used in this research include hydroxyapatite nanoparticles, ZnO nanoparticles, Aquades, PVA and polyurethane foam. Manufacturing is done by immersing polyurethane foam into a slurry. Slurry is a mixture of PVA and hydroxyapatite solutions with variations in the addition of ZnO nanoparticles (8 wt%, 10 wt%, 12 wt%, and 14 wt%). Then inject the remaining slurry into the foam. After that the sample was dried and heated at a temperature of 650ºC to remove foam and PVA, then the sample was sintered at a temperature of 1200ºC for 3 hours. Based on SEM analysis, porosity test, and compressive strength test, the best results were shown by sample IV because it had a pore diameter of 142.9 – 371.4 m with a porosity of 69.983%, a compressive strength value of 1.8653 MPa and non-toxic. The best results have not met the standard for bone filler application. In further research, improvements need to be made by using other additives such as ZrO2, so that it can improve the mechanical properties of porous hydroxyapatite to meet standard bone filler applications.


Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6127
Author(s):  
Nguyen Van Hoa ◽  
Nguyen Cong Minh ◽  
Hoang Ngoc Cuong ◽  
Pham Anh Dat ◽  
Pham Viet Nam ◽  
...  

Dye and heavy metal contaminants are mainly aquatic pollutants. Although many materials and methods have been developed to remove these pollutants from water, effective and cheap materials and methods are still challenging. In this study, highly porous hydroxyapatite/graphene oxide/chitosan beads (HGC) were prepared by a facile one-step method and investigated as efficient adsorbents. The prepared beads showed a high porosity and low bulk density. SEM images indicated that the hydroxyapatite (HA) nanoparticles and graphene oxide (GO) nanosheets were well dispersed on the CTS matrix. FT-IR spectra confirmed good incorporation of the three components. The adsorption behavior of the obtained beads to methylene blue (MB) and copper ions was investigated, including the effect of the contact time, pH medium, dye/metal ion initial concentration, and recycle ability. The HGC beads showed rapid adsorption, high capacity, and easy separation and reused due to the porous characteristics of GO sheets and HA nanoparticles as well as the rich negative charges of the chitosan (CTS) matrix. The maximum sorption capacities of the HGC beads were 99.00 and 256.41 mg g−1 for MB and copper ions removal, respectively.


Author(s):  
Anshuj Ajayrao Thetay ◽  
Santosh Kumar ◽  
Mohammed Irfan ◽  
Rafael Guerra Lund ◽  
Khushboo Desai ◽  
...  

Background. Platelet Rich Fibrin (PRF) is a concentrate of leucocyte and platelets that contains various polypeptide growth factors. It has immense potential for use as a periodontal regenerative material in periodontal defects. Porous hydroxyapatite (HA) has long been used as bone grafting material. Recently it has been reported that when PRF is used in combination with HA, itgives a synergistic effect and results in a better periodontal regeneration. The present study aims to explore the clinical and radiographic effectiveness of autologous PRF versus PRF+HA in the regenerative treatment of intrabony defects (IBD) in patients with chronic periodontitis. Methods. Sixty patients with IBDs were divided into test and control groups. The test group patients were treated with autologous PRF, whereas the control group patients were treated with PRF+HA. Clinical parameters were recorded at baseline, three months, six months and nine months’ time interval. Radiographic measurements were recorded at baseline and nine months. Results. A reduction in PI, MGI, PPD, RAL, and IBD was observed in both the groups at nine months. Mean IBD reduction in the control group was 3.70 ± 1.16 mm, whereas, the mean reduction in the test group was 4.80 ± 1.03 mm, showing a significant reduction in IBDs. Similarly, the percentage of bone fill in the test group was 65% ± 3.67%, whereas bone fill in controls was 56.7% ± 3.56%, showing a significant bone fill in the study group. Conclusion. Treatment of IBDs with PRF+HA showed a significant improvement in all the clinical and radiographic parameters. When HA was added to PRF, it increased the regenerative effect in the treatment of 3 wall IBDs.


Sign in / Sign up

Export Citation Format

Share Document