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首页> 外文期刊>Clay Minerals >Effects of the full-scale substitution of strontium for calcium on the microstructure of brushite: (Ca_xSr_(1-x))HPO_4.nH_2O system
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Effects of the full-scale substitution of strontium for calcium on the microstructure of brushite: (Ca_xSr_(1-x))HPO_4.nH_2O system

机译：锶锶锶锶对黑铅矿微观结构的影响：（CA_XSR_（1-X））HPO_4.NH_2O系统

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摘要

Brushite (CaHPO4 center dot 2H(2)O) is an important calcium phosphate encountered in bone tissue engineering and bone cement formulation. There are many studies on the synthesis and characterization of brushite, but full-scale substitution and replacement of Ca by Sr in brushite as a key element in medical and environmental applications has not yet been explored systematically. Therefore, this study aims to evaluate the effects of substitution of Ca by Sr on the microstructural and thermal properties of brushite, including the chemical phases present, crystallization, structural water and phase stability. The chemical phases were determined by means of powder X-ray diffraction. The thermal properties were studied by thermogravimetric analysis. Crystallization and surface morphology were analysed using scanning electron microscopy. Various properties were dependent on the incorporated Sr ions. The replacement percentage of Sr may be divided into two major stages: the first from 0% to 50%; and the second from 50% up to 100%. The (CaxSr1-x)HPO4 center dot nH(2)O shows that micro-scale crystals of platy brushite formed in the first stage of Sr replacement, from 0% up to 50%. As Sr might inhibit the formation of crystals, crystal nucleation rates were reduced as the Sr percentage increased. An amorphous product formed as a result of 50% Sr replacement. The second stage of Sr replacement with Sr contents 50% yielded a new crystal morphology corresponding mainly to SrHPO4 center dot nH(2)O. The complete replacement of Ca by Sr transforms the brushite with platy microcrystals into SrHPO4 nanosheets.
机译：黑石（CAHPO4中心点2H（2）O）是骨组织工程和骨水泥配方中遇到的重要磷酸钙。有很多关于石油石材的合成和表征的研究，但通过SR在黑石中替代CA的全面取代和更换作为医疗和环境应用中的关键因素尚未得到系统地探讨。因此，本研究旨在评估Ca通过Sr取代Ca的影响，对花纹的微观结构和热性能，包括存在的化学相，结晶，结构水和相位稳定性。通过粉末X射线衍射测定化学相。通过热重分析研究了热性质。使用扫描电子显微镜分析结晶和表面形态。各种性质依赖于掺入的Sr离子。 SR的更换百分比可分为两个主要阶段：第一个从0％到50％;第二个从50％到100％。 （CaxSR1-X）HPO4中心点NH（2）O表明，在SR更换的第一阶段形成的板坯晶体的微级晶体，从0％高达50％。由于SR可能抑制晶体的形成，随着SR百分比增加，晶体成核率降低。形成的无定形产物，由50％的SR更换而形成。 SR的第二阶段用Sr含量替换为SR含量＆ 50％产生新的晶体形态，主要对应于SRHPO4中心点NH（2）O.通过SR完全更换Ca，将带有Platy Microbrystals的石笔转换成SRHPO4纳米液。

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  • 来源
    《Clay Minerals》 |2020年第4期|366-374|共9页
  • 作者

    Alshaaer Mazen; Afify Ahmed S.; Moustapha Moustapha E.; Hamad Nagat; Hammouda Gehan A.; Rocha Fernando;

  • 作者单位

    Prince Sattam Bin Abduiaziz Univ Coll Sci & Humanities Al Kharj Dept Phys Ai Kharj 11942 Saudi Arabia|Univ Aveiro GeoBioTec Res Ctr Campus Santiago P-3810193 Aveiro Portugal;

    Higher Inst Engn & Automot & Energy Technol Dept Basic Sci Cairo Egypt;

    Prince Sattam Bin Abdulaziz Univ Coll Sci & Humanities Al Kharj Dept Chem Al Kharj 11942 Saudi Arabia;

    Prince Sattam Bin Abduiaziz Univ Coll Sci & Humanities Al Kharj Dept Phys Ai Kharj 11942 Saudi Arabia|Monifia Univ Fac Elect Engn Dept Phys & Math Engn Shibin Al Kawm Egypt;

    Prince Sattam Bin Abdulaziz Univ Coll Sci & Humanities Al Kharj Dept Chem Al Kharj 11942 Saudi Arabia;

    Univ Aveiro GeoBioTec Res Ctr Campus Santiago P-3810193 Aveiro Portugal;

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  • 正文语种 eng
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  • 关键词

    brushite; crystals; long-term stability; strontium hydrogen phosphate; thermogravimetric analysis;

    机译：黑岩;晶体;长期稳定性;磷酸锶;热重分析;

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