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首页> 外文期刊>Materials science & engineering, C. Materials for Biogical applications >Synthesis and characterization of silver phosphate/calcium phosphate mixed particles capable of silver nanoparticle formation by photoreduction
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Synthesis and characterization of silver phosphate/calcium phosphate mixed particles capable of silver nanoparticle formation by photoreduction

机译:磷酸银磷酸银磷酸盐/磷酸钙混合颗粒的合成与表征通过光电纳米粒子形成

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Abstract Silver phosphate is a semi-conductor sensitive to UV-Vis radiation (530nm). Exposure to radiation removes electrons from the oxygen valence shell, which are scavenged by silver cations (Ag+), forming metallic silver (Ag0) nanoparticles. The possibility of silver nanoparticle formation in situ by a photoreduction process was the basis for the application of mixed calcium phosphate/silver phosphate particles as remineralizing and antibacterial fillers in resin-based dental materials. Mixed phosphate particles were synthesized, characterized and added to a dimethacrylate resin in 20% or 30% mass fractions to investigate their efficacy as ion-releasing fillers for dental remineralization and antibacterial activity. The formation of metallic silver nanoparticles after exposure to visible radiation from a dental curing unit (peak emission: 470nm) was demonstrated by particle X-ray diffraction and scanning electron microscopy analysis of the composite fractured surface. Calcium and phosphate release from materials containing the mixed particles were similar to those containing pure CaP particles, whereas Streptococcus mutans colonies were reduced by three orders of magnitude in relation to the control, which can be attributed to silver release. As expected, the optical properties of the materials containing mixed phosphate particles were compromised by the presence of silver. Nevertheless, materials containing mixed phosphate particles presented higher fracture strength and elastic modu
机译:<![cdata [ 抽象 银磷酸盐是对UV-VIS辐射的半导体敏感(& 530 Nm)。暴露于辐射从氧气价壳中去除电子,通过银阳离子清除(Ag + ),形成金属银(Ag 0 )纳米粒子。银纳米粒子形成的可能性原位>斜体>通过光电过程是在树脂基牙科材料中施加混合磷酸钙/银磷酸盐颗粒作为再矿化和抗菌填料的基础。合成混合磷酸颗粒,其特征在于20%或30%质量级分中加入二甲基丙烯酸酯树脂,以研究它们作为牙科再生化和抗菌活性的离子释放填料的功效。通过颗粒X射线衍射和复合材料的扫描电子显微镜分析,对金属银纳米颗粒暴露于可见辐射后的可见辐射(峰发射:470 Nm)裂缝表面。从含有混合颗粒的材料的钙和磷酸盐释放与含有纯帽颗粒的材料类似,而链球菌(Steviccocccus mutans)菌落相对于控制的三个数量级减少,可以是归因于银释放。如所预期的,通过银存在损害含有混合磷酸盐颗粒的材料的光学性质。然而,含有混合磷酸盐颗粒的材料呈现出更高的断裂强度和弹性调节

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