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Ultrasound-assisted co-precipitation synthesis of GdFeO3 nanoparticles: structure, magnetic and MRI contrast properties
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-11-25 , DOI: 10.1039/d2cp03688f Yamen Albadi 1, 2 , Maria S Ivanova 3, 4 , Leonid Y Grunin 3, 4 , Rodion A Makarin 5 , Aleksei S Komlev 5, 6 , Maria I Chebanenko 7 , Vladimir N Nevedomskyi 7 , Vadim I Popkov 7
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-11-25 , DOI: 10.1039/d2cp03688f Yamen Albadi 1, 2 , Maria S Ivanova 3, 4 , Leonid Y Grunin 3, 4 , Rodion A Makarin 5 , Aleksei S Komlev 5, 6 , Maria I Chebanenko 7 , Vladimir N Nevedomskyi 7 , Vadim I Popkov 7
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Superparamagnetic nanocrystals of gadolinium orthoferrite (GdFeO3) with close to isometric morphology were successfully synthesized by heat treatment of gadolinium and iron(III) hydroxides obtained by direct co-precipitation with and without ultrasonic irradiation. The obtained samples were investigated by PXRD, low-temperature nitrogen adsorption–desorption isotherm measurements, HRTEM and VSM. It was established that ultrasonication during co-precipitation led to a decrease in the average size of GdFeO3 crystallites obtained after heat treatment by approximately 19%, an increase in their BET specific surface area by more than two times, a decrease in the degree of their aggregation by about five times and an improvement in their magnetic properties due to the increase in phase homogeneity. The colloidal solutions of the GdFeO3 nanoparticles synthesized using ultrasound were investigated by 1H NMR to measure the T1 and T2 relaxation times of water protons at 0.47 T. The resulting relaxivities r1 and r2 were approximately recalculated at 1.5, 3 and 4.7 T on the basis of a semi-statistical ad hoc method by analyzing the literature data for a number of structurally similar compounds with reported relaxivity values at different NMR frequencies. According to the experimental and predicted values of the r2/r1 ratio, the investigated GdFeO3 sample may be classified as a T1-contrast agent for MRI at 0.47 and 1.5 T, as a T1–T2 dual-modal contrast agent at 3 T and as a T2-contrast agent at 4.7 T.
中文翻译：
GdFeO3 纳米粒子的超声辅助共沉淀合成：结构、磁性和 MRI 对比特性
通过热处理直接共沉淀获得的钆和氢氧化铁 ( III )，在有和没有超声辐射的情况下，成功合成了具有接近等距形态的正铁氧体钆 (GdFeO 3 ) 的超顺磁性纳米晶体。通过 PXRD、低温氮气吸附-脱附等温线测量、HRTEM 和 VSM 研究获得的样品。已确定共沉淀过程中的超声处理导致 GdFeO 3的平均尺寸减小热处理后获得的微晶增加了约 19%，BET 比表面积增加了两倍以上，聚集度降低了约五倍，并且由于相均匀性的增加而改善了磁性能. 通过1 H NMR研究了使用超声波合成的 GdFeO 3纳米粒子的胶体溶液，以测量水质子在 0.47 T 下的T 1和T 2弛豫时间。所得弛豫率r 1和r 2近似重新计算为 1.5、3 和4.7 T 基础上的半统计特设方法通过分析许多结构相似的化合物的文献数据，这些化合物在不同的 NMR 频率下报告了弛豫值。根据r 2 / r 1比率的实验值和预测值，研究的 GdFeO 3样品可归类为T 1 -MRI 的 0.47 和 1.5 T 造影剂，作为T 1 – T 2双模态造影剂3 T 的代理和 4.7 T的T 2造影剂。
更新日期：2022-11-25
中文翻译：
GdFeO3 纳米粒子的超声辅助共沉淀合成：结构、磁性和 MRI 对比特性
通过热处理直接共沉淀获得的钆和氢氧化铁 ( III )，在有和没有超声辐射的情况下，成功合成了具有接近等距形态的正铁氧体钆 (GdFeO 3 ) 的超顺磁性纳米晶体。通过 PXRD、低温氮气吸附-脱附等温线测量、HRTEM 和 VSM 研究获得的样品。已确定共沉淀过程中的超声处理导致 GdFeO 3的平均尺寸减小热处理后获得的微晶增加了约 19%，BET 比表面积增加了两倍以上，聚集度降低了约五倍，并且由于相均匀性的增加而改善了磁性能. 通过1 H NMR研究了使用超声波合成的 GdFeO 3纳米粒子的胶体溶液，以测量水质子在 0.47 T 下的T 1和T 2弛豫时间。所得弛豫率r 1和r 2近似重新计算为 1.5、3 和4.7 T 基础上的半统计特设方法通过分析许多结构相似的化合物的文献数据，这些化合物在不同的 NMR 频率下报告了弛豫值。根据r 2 / r 1比率的实验值和预测值，研究的 GdFeO 3样品可归类为T 1 -MRI 的 0.47 和 1.5 T 造影剂，作为T 1 – T 2双模态造影剂3 T 的代理和 4.7 T的T 2造影剂。
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