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Smart magnetic nanopowder based on the manganite perovskite for local hyperthermia

机译：基于锰酸盐钙钛矿的智能磁性纳米粉末局部热疗

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摘要

For many medical applications related to diagnosis and treatment of cancer disease, hyperthermia plays an increasingly important role as a local heating method, where precise control of temperature and parameters of the working material is strongly required. Obtaining a smart material with “self-controlled” heating in a desirable temperature range is a relevant task. For this purpose, the nanopowder of manganite perovskite with super-stoichiometric manganese has been synthesized, which consists of soft spherical-like ferromagnetic nanoparticles with an average size of 65 nm and with a narrow temperature range of the magnetic phase transition at 42 °C. Based on the analysis of experimental magnetic data, a specific loss power has been calculated for both quasi-stable and relaxation hysteresis regions. It has been shown that the local heating of the cell structures to 42 °C may occur for a short time (～1.5 min.) Upon reaching 42 °C, the heating is stopped due to transition of the nanopowder to the paramagnetic state. The obtained results demonstrate the possibility of using synthesized nanopowder as a smart magnetic nanomaterial for local hyperthermia with automatic heating stabilization in the safe range of hyperthermia without the risk of mechanical damage to cell structures.
机译：对于与癌症疾病的诊断和治疗有关的许多医学应用，热疗作用越来越重要的作用作为局部加热方法，其中强烈需要精确控制工作材料的温度和参数。在理想的温度范围内获得“自控”加热的智能材料是相关的任务。为此目的，已经合成了具有超级化学计量锰的锰矿钙钛矿的纳米粉末，其由平均尺寸为65nm的软球状铁磁性纳米颗粒和磁相的窄温度范围在42℃下。基于对实验磁数据的分析，已经针对准稳定和松弛滞后区域计算了特定的损耗功率。已经表明，在达到42℃时，电池结构的局部加热可能发生在短时间（〜1.5分钟）。由于纳米孔的转变为顺磁状态，加热停止加热。所得结果证明了使用合成的纳米粉末作为局部热疗的智能磁性纳米材料，其具有在热疗的安全范围内的自动加热稳定，而不会对细胞结构造成机械损伤的风险。

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