Nanjing Haoqi Advanced Materials Co.

Nanjing, China

Nanjing Haoqi Advanced Materials Co.

Nanjing, China
SEARCH FILTERS
Time filter
Source Type

Li J.,Nanjing University of Technology | Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Nian S.,Nanjing University of Technology | And 4 more authors.
Applied Physics A: Materials Science and Processing | Year: 2017

An approximate glass-forming region in the P2O5–Sb2O3–CaO ternary system was determined. The properties and structure of two compositional series of (A) (75−x)P2O5–xSb2O3–25CaO (x = 20, 25, 30, 35 mol%) and (B) 45P2O5–30Sb2O3–(25−x)CaO–xTeO2 (x = 5, 10, 15, 20 mol%) were studied systematically. Thermal properties were investigated by means of differential scanning calorimetry (DSC). The densities of all samples were measured by Archimedes’ method using distilled water as the immersion liquid. The water durability of the glasses was described by their dissolution rate (DR) in the distilled water at 90 °C for some time periods. Density, thermal stability and water durability were improved with the addition of Sb2O3 and TeO2. Structural studies were carried out by X-ray diffraction (XRD), infrared spectroscopy and Raman spectroscopy. The phosphate chain depolymerization occurred with the increase of Sb2O3 and the Q2 structural units transformed to the Q1 and Q0 structural units with the addition of TeO2. © 2017, Springer-Verlag Berlin Heidelberg.


Jiang S.,Nanjing University of Technology | Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Shu Y.,Nanjing University of Technology | And 3 more authors.
Biomedical Materials (Bristol) | Year: 2017

An amino-functionalized mesoporous bioactive glass (N-MBG) with a high drug loading capacity and longer drug release time was successfully prepared by using 3-aminopropyltriethoxysilane (APTES) in a short-time chemical reaction. The drug release performance of an MBG and the N-MBG were studied by loading gentamicin sulfate (GS) in a simulated body fluid solution. The results showed that the surface area of the N-MBG increases to 355.01 m2g-1 after amination at 80 °C for 1 h compared with that of the MBG (288.07 m2g-1). Meanwhile, the surface zeta-potential of the N-MBG charges from the original negative charge (-10.06 mV) to the positive charge (+5.30 mV). Furthermore, the GS loading rate of the N-MBG is up to 62.92 2.02%, higher than that of the MBG (48.90 1.71%). In addition, the N-MBG has a longer drug release period and the seven-day accumulative release from the N-MBG reached only 45.9 1.8%, significantly lower than that of the MBG, 60.7 2.3%. In vitro bioactivity tests suggested that the N-MBG exhibited good biological activity. In conclusion, the N-MBG with a higher loading capacity and longer drug release time can serve as a promising candidate as a drug carrier. © 2017 IOP Publishing Ltd.


Li W.,Nanjing University of Technology | Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Zhou N.,Nanjing University of Technology | And 4 more authors.
Ceramics International | Year: 2017

The research aims to fabricate a porcelain with high strength and transmittance by adding a small amount of anorthite chamotte. The chamotte used in the research was compounded by quartz, calcite and alumina. The porcelain with best overall performance in the research has high flexural strength of 175. MPa, higher than that of bone china and hard porcelain, and has high transmittance of 6.2%/ 2. mm, higher than that of single phase anorthite ceramic. It was sintered at a temperature of 1280. °C and 12. wt% chamotte was added. Quartz was the primary crystalline phase in all samples, presenting mullite as minor crystalline phase. The trace of anorthite was observed in the fired samples when addition of chamotte was more than 9. wt%. It has been found that the addition of anorthite chamotte can promote uniform distribution of mullite, which can reinforce the flexural strength and transmittance of porcelain. © 2017 Elsevier Ltd and Techna Group S.r.l.


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Wu Z.,Nanjing University of Technology | Shu Y.,Nanjing University of Technology | And 3 more authors.
Materials Science and Engineering C | Year: 2017

A novel bioactive vaterite-containing tricalcium silicate bone cement (V5) was successfully synthesized through self hydration and carbonization, by introducing CO2 into the hydration process of Ca3SiO5 (C3S). The purpose of this work is to reduce the adverse effect of the hydration products Ca(OH)2 on the C3S bone cement, and improve further the bioactivity of the C3S bone cement. XRD and FT-IR analysis indicated that vaterite was successfully formed in tricalcium silicate bone cement. The in vitro bioactivity of V5 was investigated by soaking in simulated body fluid (SBF) for various periods (1, 3, 7 days), in addition to setting time, compressive strength and cell behavior. The results showed that the V5 could rapidly induce hydroxyapatite (HA) formation. The bio-effects of V5 on MC3T3-E1 osteoblast-like cells were evaluated by studying cell viability, adhesion and proliferation. The CCK-8 assay shows that cell viability on the resulting V5 is improved obviously after through hydration and carbonization. The V5 cement enhanced the higher expression of cell attachment, proliferation and differentiation as compared to V50 cement. SEM results present significant improvement on the cell adhesion and proliferation for cells cultured on the V5. Experimental results demonstrated that, C3S bone cement of containing vaterite has more excellent bioactivity and medium setting time too, suggesting their potential applications in areas such as MC3T3-E1 cell stimulation and bone tissue engineering. © 2017 Elsevier B.V.


Zhou N.,Nanjing University of Technology | Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Nian S.,Nanjing University of Technology | And 4 more authors.
Journal of Alloys and Compounds | Year: 2017

A series of Zn1-xCoxO (x = 0.01, 0.02, 0.03 and 0.04) green pigments have been synthesized by solid-state reaction. The pigment samples were characterized by X-ray diffraction, scanning electron microscope, thermal gravimetric, differential scanning calorimetry, ultraviolet–visible diffuse reflectance spectroscopy and CIE L*a*b* colorimetric analysis. The results demonstrated that the synthetic pigment is a kind of new green hue based on crystal structure of zinc oxide, which can be used as color pigments. High energy ball milling (HEBM, the suitable milling time was 2 h) can reduce the particle size and make it uniform, also can improve the color properties of pigments. The calcination temperature of solid state reaction and the color brightness can be improved by adding 2 wt% CaF2. The appropriate calcination temperature for synthetic pigments is 1100 °C, and all samples remained the basic crystalline structure of ZnO. The content of cobalt oxide in the pigment is much less (about 1.8 wt%) than other cobalt based pigments. At the same time, the samples with milling showed better near infrared reflectance (NIR). Therefore, the prepared cobalt green pigment has a good application prospect. © 2017 Elsevier B.V.


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Hong Z.-R.,Nanjing University of Technology | Ren Y.-P.,Shandong Institute of Advanced Ceramics Co. | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2014

Mesoporous bioactive glass (MBG) was obtained by the evaporation-induced self-assembly method which uses H3PO4 as catalyst and nonionic block copolymer (EO20PO70EO20, P123) as templates, respectively. Its average pore diameter, specific area and pore volume were 3.6 nm, 476.7 m2g- 1 and 0.49 cm 3g- 1. The structure and performance were characterized by small-angle X-ray diffraction (SAXRD), nitrogen adsorption-desorption isotherms and transmission electron micrographs (TEM). The results demonstrated that using H3PO4 as catalyst is useful to prepare MBG with larger surface area and highly ordered mesopore. In vitro bioactivity test suggested that this MBG exhibited an excellent formation of hydroxyl-carbonated apatite layer. © 2014 Elsevier B.V. All rights reserved.


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Yang Y.,Nanjing University of Technology | Li W.,Nanjing University of Technology | Ren Y.,Shandong Institute of Advanced Ceramics Co.
International Journal of Applied Ceramic Technology | Year: 2015

To improve the flexural strength and light-transmission properties of bone china, the effects of adding different amounts of alumina (0-3%) to bone china bodies were studied and the phase composition and microstructure of different samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, physical properties, such as the bulk density, the thermal expansion coefficient (TEC) and thermal shock resistance, were studied. It was found that adding alumina increased the overall sintering temperature while reducing the sintering temperature range of bone china. Furthermore, addition of 1% Al2O3 improved the tree-point flexural strength from 120 MPa to 150 MPa, the light transmittance (at 2 mm thickness) from 6.7% to 7.5%, the thermal expansion coefficient from 8.4 × 10-6°C-1 to 8.1 × 10-6°C-1 and the thermal shock resistance from 140°C to 180°C. Higher corundum content results in similar high flexural strength but lower light transmittance. © 2014 The American Ceramic Society.


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Yao N.,Nanjing University of Technology | Wang F.,Nanjing University of Technology | And 2 more authors.
RSC Advances | Year: 2014

Porous calcium metaphosphate (CMP) ceramics were manufactured using an in situ self-foaming method. The porous CMP ceramics with different porosities and strengths, and the preparation process and the properties of the resulting material were studied. Under the conditions of a low molding pressure (蠆2.0 MPa) or low heating rate (蠆0.5°C min-1), green specimens synthesized using only Ca(H2PO4)2·H2O (MCPM) or Ca(H2PO4)2 (MCPA) as raw materials can be fabricated into porous bioceramics without deformation and without pore-forming agents. In this study, MCPA specimens were molded at a pressure of 80.0 MPa and the heating rate was controlled at 0.5°C min-1. The synthetic biomaterial showed a porosity of 38.0% and a strength of 48.0 MPa. © The Royal Society of Chemistry 2014.


Wang F.,Nanjing University of Technology | Xu Z.,Nanjing University of Technology | Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | And 3 more authors.
Ceramics International | Year: 2016

Vaterite-doped beta-dicalcium silicate bone cement has been successfully synthesized by green synthetic method. The purpose is to reduce the adverse effect caused by the hydration products Ca(OH)2 in the β-Ca2SiO4 bone cement, and improve the bioactivity of the β-Ca2SiO4 bone cement. The in vitro bioactivity of vaterite-doped β-Ca2SiO4 bone cements was evaluated compared with β-Ca2SiO4 bone cement without vaterite by soaking in simulated body fluid (SBF) for the same time (3 days). The formation abilities of hydroxyapatite (HAp) on their surfaces were analyzed by XRD, SEM, EDS and FT-IR. In addition, the setting time of vaterite-doped cement was measured. Experimental results demonstrated that vaterite-doped β-Ca2SiO4 bone cements could easily induce the formation of HAp on their surfaces after immersion in SBF. And vaterite-doped β-Ca2SiO4 bone cement has much better HAp forming ability and appropriate setting time (12±2 min) than the other one, which can not only eliminate the alkali-silica reaction (ASR) for bone cements but also be expected to be a satisfactory substrate for the bone repairing. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Wang D.,Nanjing University of Technology | Wang F.,Nanjing University of Technology | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2015

Abstract To ensure the operability of the clinical, the setting time is one of the most clinically vital factors. Sol-gel technique was used to prepare calcium silicate powders with different molar ratios of CaO/SiO2, and the calcium silicate bone cements (CSCs) were obtained in this study. Functional groups of powder and cements were analyzed by infrared spectroscopy (FT-IR). The doped cement was prepared using carboxymethylcellulose (CMC)-containing calcium silicate powder as solid phase and distilled water as liquid phase. Phase composition, morphology, setting time (St) and compressive strength (Cs) of the doped cement, after mixing with water, were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Gillmore needle and electronic universal material testing machine, respectively. In vitro mineralization of doped cement was investigated by SBF immersion test by soaking the samples individually in 10-ml of simulated body fluid (SBF) solution at 37 °C for 0, 1, 3, 7 and 15 days (d), respectively. The results indicated that the doped cement with 0.10% CMC possessed shorter setting time, higher compressive strength, and desirable bioactivity that makes it an attractive choice for use in vertebroplasty and bone filling surgery. © 2015 Elsevier B.V.

Loading Nanjing Haoqi Advanced Materials Co. collaborators
Loading Nanjing Haoqi Advanced Materials Co. collaborators