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首页> 外文期刊>Polymer Composites >Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel
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Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel

机译：γ辐射在热响应聚（N-异丙基丙烯酰胺）水凝胶中合成的Ag纳米颗粒的结构特征及粘合环境

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To produce well-defined metal clusters stabilized in protective matrix, poly(N-isopropylacrylamide) (PNi-PAAm) hydrogel with different initial concentration of polymer was used as nanoreactor. The in situ synthesis of well dispersed silver nanoparticles (AgNPs) was performed by gamma irradiation. The obtained AgNPs are spherical in shape with the diameter less than 20 nm. Crystalline properties of nanoparticles such as size, texture coefficient, strain, stress, lattice parameter, d-spacing, and dislocation density have been calculated using XRD data. Results confirm that the changes of lattice parameter of crystalline AgNPs sensitively reflect their state of strain and stress depending on the formation conditions (i.e., on the concentration of PNiPAAm) and on the diameter of AgNPs. The negative lattice strain and compression stress were observed for the smaller AgNPs (lattice contraction), while for the larger AgNPs are positively strained and under tensile stress (lattice expansion). XPS spectra revealed the donor-acceptor type of interaction between carbonyl oxygen from PNiPAAm and AgNPs (positive shift of high BE component of O 1s and negative shift of Ag 3d BE). The greater dislocation density of smaller AgNPs incorporated in more concentrated PNiPAAm, resulted in more binding sites and stronger interaction with polymer. (C) 2015 Society of Plastics Engineers
机译：为了生产在保护基质中稳定的明确定义的金属簇，使用具有不同初始浓度聚合物的聚（N-异丙基丙烯酰胺）（PNI-PAAM）水凝胶作为纳米反应器。通过γ辐射进行良好分散的银纳米颗粒（AgNP）的原位合成。所得AgNP的形状为球形，直径小于20nm。使用XRD数据计算了诸如尺寸，纹理系数，应变，应力，晶格参数，D间距和位错密度的纳米颗粒的结晶性能。结果证实结晶AgNP的晶格参数的变化敏感地反映了它们的应变和应力状态，这取决于地层条件（即，在泊匹帕的浓度上）和agnps的直径。对于较小的AgNP（晶格收缩）观察到负晶格菌株和压缩应力，而对于较大的agnps是正紧张和拉伸应力（晶格膨胀）。 XPS光谱揭示了从泊匹帕姆和AgNP之间的羰基氧与AgNP之间的供体 - 受体类型（高于O 1S的正偏移和AG 3D的负偏移）。掺入更浓缩的泊匹帕姆的较小AgNP的较大脱位密度导致更结合位点和与聚合物的相互作用更强。 （c）2015年塑料工程师协会

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