• 제목/요약/키워드: Hydroxyapatite(HAp)

검색결과 147건 처리시간 0.032초

Cp-Ti 표면의 Hydroxyapatite+TiO2 복합 Sol 코팅에 관한 연구 (Hydroxyapatite+TiO2 Composite Sol Coating on Cp-Ti)

  • 김윤종;김택남;이성호
    • 한국재료학회지
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    • 제15권7호
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    • pp.444-447
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    • 2005
  • In this study, $Hydroxyapatite+TiO_2(HAp+TiO_2)$ composite sol coatings on Cp-Ti substrates were deposited by using a sol-gel derived precursor. Prior to hydroxyapatite coating, the samples were micropolished and divided into three sets. The first set was coated with hydroxyapatite (HAp) directly on Cp-Ti. The second set was first coated with intermediate titania layer and then coated with HAp. The third set samples were coated with $HAp+TiO_2$ (50:50) composite sol. Each samples were predried at $200^{\circ}C$, and heat treated at $600^{\circ}C$. The formation of hydroxyapatite has been confirmed by XRD analyses and the substrate material was found to be oxidized with negligible amount of CaO in the coating. The NaOH treated samples showed the presence of rutile crystal. The SEM studies revealed surface morphologies of each samples. $HAp+TiO_2$ composite sol coating layer was found to be smooth. The bonding strength of each samples were calculated using pull out tests. The bonding strength of the $HAp+TiO_2$ composite sol coating on substrate was 29.35MPa.

Hydroxyapatite의 파우더 표면 복합화를 통한 형태 및 기계적 성질에 관한 연구 (Morphology and Mechanical Properties through Hydroxyapatite Powder Surface Composite)

  • 계성봉;박수남
    • 공업화학
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    • 제27권3호
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    • pp.299-306
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    • 2016
  • 본 연구는 광노화의 원인으로 알려진 자외선을 차단하는 새로운 복합 분체에 관한 것이다. Hydroxyapatite (HAp)는 자체 생체 친화적이고, 피부에 도포 시 백탁 현상 없이 자외선을 차단하는 효과가 우수하다. 그러나 HAp 구조가 단단한 육방정계이어서 피부 도포 시 피부손상과 분체의 재응집 현상이 발생되어 화장 후 뭉치는 현상, 자체 사용감이 매끄럽지 못하는 단점을 가지고 있다. 이러한 문제점을 개선하고자 HAp의 표면 개질을 통한 자외선 차단 증진 및 사용감을 개선한 새로운 복합 분체를 개발하고자 하였다. 본 연구에서 HAp의 표면 개질을 위해 코팅제로 dimethicone, lauroyl lysine, triethoxycaprylylsilane 및 silica를 사용하였다. Dimethicone, lauroyl lysine 및 triethoxycaprylylsilane은 건식 방법으로 각각 표면 복합화 처리하였고, silica는 수열 합성법으로 표면 처리하여 표면 복합체를 제조하였다. 제조된 HAp 복합체의 자외선 차단 효과를 측정하여 실리카가 코팅된 HAp-silica를 최적의 HAp 복합체로 선정하였다. SEM, 입자크기와 분포, 표면 측정, EDS 분석을 통해 HAp-silica의 표면 복합 분체 특성을 조사하였다. 또한 제형 내에서 안정성, BB cream에서 자외선 차단 효과 측정 및 안전성 시험을 실시하였다. 연구 결과, HAp 분체의 표면 개질을 통해 제조한 HAp-silica는 사용감이 우수하였고, 백탁 현상을 개선함으로써 자외선 차단 효과를 증진시키는 복합 분체로서 자외선 차단 화장품의 새로운 기능성 소재로서 응용 가능성이 있음을 확인하였다.

반도체 제조공정의 폐수슬러지로 합성된 Hydroxyapatite를 이용한 인산이온의 흡착 (The Adsorption of Phosphate Son Using Hydroxyapatite synthesized by Wastewater Sludge of Semiconductor Fabrication Process)

  • 강전택;정기호;신학기
    • 한국환경과학회지
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    • 제11권3호
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    • pp.257-262
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    • 2002
  • The hydroxyapatite(HAp) for the present study was prepared with the wastewater sludge from semiconductor fabrication process and it was crystallized in an electric furnace for 30 min at 90$0^{\circ}C$. The adsorption characteristics of HAp for phosphate ion in aqueous solution has been investigated. The adsorbed ratio of phosphate ion for HAp were investigated according to the reaction time, amount of HAp, concentration of standard solution, pH of solution, and influence of concomitant ions. The amount of adsorbed phosphate ion decreased with the increase of pH due to the mutual electrostatic repulsion between adsorbed phosphate ions and competitive adsorption between phosphate ion and OH- ion in aqueous solution. The maxium amount of the adsorption equilibrium for phosphate ion was about 24 mg/g of HAp. The HAp would likely to be a possible adsorbent for the removal of phosphate ion in the waste water.

수산화인회석이 충전된 고분자 복합체의 치과적 물성 (Dental Properties of Hydroxyapatite Filled Polymer Composite)

  • 김오영;서기택
    • 폴리머
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    • 제30권2호
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    • pp.135-139
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    • 2006
  • 인체 뼈의 주성분인 수산화인회석(hydroxyapatite, HAP)이 충전된 고분자 복합체를 제조하고 이들의 치과적 물성을 분석하여 치과용 수복재료로의 응용성을 확인하고자 하였다. 복합체 제조에 사용된 기질인 아크릴계 단량체는 가시광선으로 경화시켰다. 실험 결과, HAP는 무게비로 65%까지 첨가되었으며 중합깊이는 6.0 mm 정도로서 일반적 치과용 수복재료로의 응용이 가능함을 확인하였다. 제조된 고분자 복합체의 중합전환율은 HHP 첨가량이 늘어날수록 약간 감소하였으며 중합수축률은 HAP 변화량에의 의존성이 거의 없었다. 복합체의 기계적 물성은 HAP함량이 증가할수록 간접인장강도는 증가하였고 굴곡강도는 큰 변화가 없었다. 그러나 그 값들은 치의학에서 규정한 값들을 상회하여 치과용 재료로의 응용 가능성이 매우 높음을 확인할 수 있었다.

유진놀을 이용한 수산화아파타이트 성형체에 관한 연구 (Study on the Hydroxyapatite Body Using with the Eugenol)

  • 류수착
    • 한국재료학회지
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    • 제14권6호
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    • pp.375-378
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    • 2004
  • The samples were prepared with hydroxyapatite(HAp) powder and eugenol (Eugenol/HAp = 15, 20, 25, 30wt%). The samples were dried at room temperature. The higher mechanical properties was observed in HAp sample with 25wt% Eugenol. The average compressive and bending strength in HAp with 25wt% Eugenol are 542 kgf/$\textrm{mm}^2$ and 366 kgf/$\textrm{mm}^2$ respectively. This strength is higher compare to that of the cortical bone.

Hydroxyapatite Zirconia 계 복합 Bioceramics에 관한 연구 (A Study on the Hydroxyapatite-Zirconia Composite Bioceramics)

  • 이종필;최현국;송종택;최상흘
    • 한국세라믹학회지
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    • 제28권4호
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    • pp.289-296
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    • 1991
  • Hydroxyapatite (HAp)-zirconia bioceramics, which have excellent biocompatibility with tissue of bone and tooth and good mechanical properties, were synthesized, and their properties and biocompatibility were investigated. HAp powders were synthesized with Ca/P=1.67 and pH 11 by precipitation method. A fine spherical monodispersed ZrO2 powders were prepared by metal alkoxide method, and then they were partially stabilized with 10 mol% CaO by solid state reaction at 1300℃. HAp-zirconia composites were prepared by sintering of these HAp mixed with various amount CaO-partially stabillized zirconia (PSZ). When HAp containing 15 wt% PSZ with 10 mol% CaO (PSZ(10C)) were sintered at 1250℃, it was prevented to decompose into TCP and ZrO2 was uniformly dispersed at HAp matrix. Mechanical strength of these sintered bodies were increased by addition of 15 wt% PSZ(10C), the bending strength of compacts fired at 1250℃ was 165 MPa. HAp-PSZ composites chemically bonded each other in Ringer's solution and the component of bonded layer was HAp. These composites did not prevent cell-growing and exhibit any cytotoxic effects.

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반응표면분석법을 이용한 Hydroxyapatite 첨가 활성탄에서의 Cd 흡착특성에 관한 연구 (Adsorption Characterization of Cd by Activated Carbon containing Hydroxyapatite using Response Surface Methodology (RSM))

  • 안상우;유지영;최재영;박재우
    • 한국물환경학회지
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    • 제25권6호
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    • pp.943-950
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    • 2009
  • Cadmium (Cd) adsorption onto the activated carbon containing hydroxyapatite (HAP) was investigated in batch experiments and response surface methodology (RSM) using the Box-Behnken methods were applied to the experimental results. Cd adsorption with different HAP mass ratio of from 10% to 30%. With more HAP, Cd was more adsorbed. These results suggest that the higher HAP mass causes an increase of the ion exchange potential of the HAP sorbent. Equilibrium experimental results from Cd adsorption was fitted to Langmuir and Freundlich isotherm models. Cd adsorption on HAP sorbent were found to follow the Freundlich isotherm model well in the initial adsorbate concentration range. Also, Cd adsorption was a function of the HAP mass ratio ($x_1$), initial Cd concentration ($x_2$), and initial pH ($x_3$) from the application of the RSM. Statistical results showed the order of significance of the independent variables to be initial Cd concentration > HAP mass ratio > initial pH.

High-frequency Induction Heating Sintering of Hydroxyapatite-($ZrO_2+3%Mol\;Y_2O_3$) Bioceramics

  • Khalil, Khalil Abdel-razek;Kim, Sug-Won
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.924-925
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    • 2006
  • In this study, hydroxyapatite (HAp) and hydroxyapatite-yttria stabilized zirconia (HAp-3YSZ) with 20 vol.%-($ZrO_2+3%mol\;Y_2O_3$) nanopowders were consolidated very rapidly to full density by High-frequency induction heat sintering (HFIHS). Effects of temperature and the addition of 3YSZ on the toughness, hardness and microstructure properties have been studied. 3YSZ second phase toughening HAp composites with higher toughness were successfully developed at relatively low temperatures through this technique. Compared with hardness and toughness obtained for pure HAp, the hardness and toughness for HAp-20vol. % 3YSZ were much higher.

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Apatite를 이용한 중금속 제거 (The Removal of Heavy Metals in Aqueous Solution by Hydroxyapatite)

  • 강전택;정기호
    • 한국환경과학회지
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    • 제9권4호
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    • pp.325-330
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    • 2000
  • The hydroxyapatite (HAp) for the present study was prepared by precipitation method in semiconductor fabrication and the crystallized at ambient to 95$0^{\circ}C$ for 30min in electric furnace. The ion-exchange characteristics of HAp for various heavy metal ions such as $Cd^{2+}, Cu^{2+}, Mn^{2+}, Zn^{2+}, Fe^{2+}, Pb^{2+}, Al^{3+}, and Cr^{6+}$ in aqueous solution has been investigated. The removal ratio of various metal ions for HAp were investigated with regard to reaction time, concentration of standard solution, amount of HAp and pH of solution. The order of the ions exchanged amount was as follws: $Pb^{2+}, Fe^{3+}>Cu^{2+}>Zn^{2+}>Al^{3+}>Cd^{2+}>Mn^{2+}>Cr^{6+}. The Pb^{2+}$ ion was readily removed by the Hap, even in the strongly acidic region. The maximum amount of the ion-exchange equilibrium for $Pb^{2+}$ ion was about 45 mg/gram of HAp. The HAp would seem to be possible agent for the removal of heavy metal ions in waste water by recycling of waste sludge in semiconductor fabrication.

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Hydroxyapatite-Zirconia 복합 Ceramcis의 제조 및 특성 (Synthesis and Properties of Hydroxyapatite-Zirconia Composite Ceramics)

  • 송종택;변승호;류동우;최상흘
    • 한국세라믹학회지
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    • 제30권9호
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    • pp.754-760
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    • 1993
  • Hydroxyapatite(HAp)-zirconia composite ceramics were prepared by simplified synthesis process and then their properties were investigated. Composite powders of HAp and zirconia were successively synthesized under Ca/P=1.69, 1.71, 1.73 and pH=11 by precipitation method. HAp-zirconia ceramics were obtained with sintering of these various HAp-zirconia composite powders. These sintered bodies were mainly composed of HAp and ZrO2(tetragonal), but it was found that a little of HAp was decomposed into TCP as the amount of zirconia and the sintering temperature were increased. When HAp having 10~15wt.% ZrO2 content were sintered in the range of 1150 to 130$0^{\circ}C$, the apparent porosity was about 7~11%. This showed that the successive synthesis process employed here had a limit to obtian more densified composite ceramics.

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