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Rapid Micelle-Mediated Size-Controlled Fabrication of Calcium Sulfate Nanorods Using Silver Nanoparticles.
Langmuir ( IF 3.7 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.langmuir.0c01043 Taichi Nakagawa 1 , Willie L Hinze 2 , Yoshitaka Takagai 1
Langmuir ( IF 3.7 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.langmuir.0c01043 Taichi Nakagawa 1 , Willie L Hinze 2 , Yoshitaka Takagai 1
Affiliation
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Calcium sulfate nanorods (CS-NRs) are valuable materials utilized in various applications, particularly in the medical field. In this work, the size-controlled synthesis of CS-NRs was carried out on the basis of the micelle-mediated phase separation phenomenon. A nonionic surfactant, Triton X-114, was employed for the thermoresponsive phase separation of a homogeneous solution to a surfactant-rich phase. Whereas each specific ion, Ca2+ and SO42–, was difficult to individually extract when present at concentrations less than their equilibrium concentration (solubility product constant, Ksp), the synthesized CS microrods (CS-μRs) were extracted into the surfactant-rich phase (enrichment factor = ca. 50). The presence of nitric acid increased the size of the materials up to 6707 ± 3488 nm on the long side and 87 ± 37 nm on the short side. The addition of silver nanoparticles (Ag-NPs) to the reaction mixture led to the formation of much smaller products, i.e., uniform CS-NRs whose sizes were in the range of 89 ± 15 nm (long side) and 25 ± 4 nm (short side). The size of the extracted Ag-NPs and CS-NRs decreased with an increase in added Ag-NP concentration until their microscopic observation became difficult. The factors (such as additive concentration, pH, temperature) affecting size control were evaluated.
中文翻译：
使用银纳米颗粒的快速胶束介导的尺寸控制的硫酸钙纳米棒的制备。
硫酸钙纳米棒（CS-NRs）是有价值的材料，可用于各种应用，特别是在医学领域。在这项工作中，在胶束介导的相分离现象的基础上进行了CS-NRs的尺寸控制合成。非离子型表面活性剂Triton X-114用于将均相溶液热分离为富表面活性剂的相。当每种特定离子Ca 2+和SO 4 2–的浓度低于其平衡浓度时（浓度乘积常数，K sp），将合成的CS微棒（CS-μRs）提取到表面活性剂丰富的相中（富集系数=约50）。硝酸的存在使材料的尺寸从长边增加到6707±3488 nm，从短边增加到87±37 nm。向反应混合物中添加银纳米颗粒（Ag-NPs）导致形成更小的产物，即尺寸在89±15 nm（长边）和25±4 nm（短边）。提取的Ag-NP和CS-NRs的尺寸随着添加的Ag-NP浓度的增加而减小，直到它们的显微观察变得困难为止。评估影响尺寸控制的因素（如添加剂浓度，pH，温度）。
更新日期：2020-07-07
中文翻译：
使用银纳米颗粒的快速胶束介导的尺寸控制的硫酸钙纳米棒的制备。
硫酸钙纳米棒（CS-NRs）是有价值的材料，可用于各种应用，特别是在医学领域。在这项工作中，在胶束介导的相分离现象的基础上进行了CS-NRs的尺寸控制合成。非离子型表面活性剂Triton X-114用于将均相溶液热分离为富表面活性剂的相。当每种特定离子Ca 2+和SO 4 2–的浓度低于其平衡浓度时（浓度乘积常数，K sp），将合成的CS微棒（CS-μRs）提取到表面活性剂丰富的相中（富集系数=约50）。硝酸的存在使材料的尺寸从长边增加到6707±3488 nm，从短边增加到87±37 nm。向反应混合物中添加银纳米颗粒（Ag-NPs）导致形成更小的产物，即尺寸在89±15 nm（长边）和25±4 nm（短边）。提取的Ag-NP和CS-NRs的尺寸随着添加的Ag-NP浓度的增加而减小，直到它们的显微观察变得困难为止。评估影响尺寸控制的因素（如添加剂浓度，pH，温度）。
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