Research on Ice Crystal Growth Inside the Vitrified Vs55 with Magnetic Nanoparticles During Devitrification by Cryomicroscopy
Research on Ice Crystal Growth Inside the Vitrified Vs55 with Magnetic Nanoparticles During Devitrification by Cryomicroscopy
复制标题
低温显微镜法研究磁性纳米颗粒玻璃化 Vs55 失透过程中冰晶生长的研究
DOI：
10.1007/s40242-019-8230-6
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发表时间：
2019-06-01
影响因子：
3.1
通讯作者：
Yu Hongmei
中科院分区：
文献类型：
--
作者：
Liu Ke;Xu Yi;Yu Hongmei
采用差示扫描量热法（DSC）和低温显微镜系统研究了磁性纳米粒子（mNPs）对典型玻璃化溶液Vs 55失透结晶的影响。结果表明：（i）羧酸（CA）和聚乙二醇（PEG）包覆的mNPs对Vs 55的玻璃化转变温度（Tg）影响不大，但对失透转变温度（Td）和失透焓有显著影响;（ii）在失透区范围内，（-85--60 °C）时，随着等温温度和降温速率的增加，CA包覆的MNP能显著加速Vs 55的失透，在-85 °C等温时，冰的生长速率为0.37 μm/s，在−75 °C时约为2.19 μm/s。当冷却速率从2 °C/min增加到100 °C/min时，冰的生长速率从1.72 μm/s增加到3.54 μm/s（在-75 °C的等温温度下），（iii）由PEG和CA两者包覆的磁性纳米颗粒可以促进Vs 55的失透，例如，在-80 °C的等温温度下，Vs 55内部没有任何晶体生长，而加入CA和PEG包覆的磁性纳米粒子时，其速度分别为1.04和2.31 μm/s。与CA包覆的样品相比，PEG以更积极的方式促进Vs 55的失透，在-85 ° C和-75 °C的等温温度下，冰的生长速率分别为0.62和6.25 μm/s。这些结果表明，MNP的表面包覆可以显着影响Vs 55的再结晶，并在未来的研究中需要进一步的工作。
The effect of magnetic nanoparticles(mNPs) on the devitrification crystallization of typical vitrification solution Vs55 was systematically explored by differential scanning calorimetry(DSC) and cryomicroscope system. The results show that, (i) the mNPs coated by both carboxylic acid(CA) and polyethylene glycol(PEG) had little effect on the glass transition temperature(Tg) of Vs55, but had significant effect on the devitrification transition temperature(Td) and devitrification enthalpy, (ii) in the range of the devitrification area(−85— −60 °C), the MNPs coated by CA can significantly accelerate the devitrification of Vs55 as the isothermal temperatures and the cooling rates increased, and the ice growth rate was 0.37 μm/s at the isothermal temperature of −85 °C, and was about 2.19 μm/s at −75 °C. Also, the ice growth rates rose from 1.72 μm/s to 3.54 μm/s when the cooling rates were increased from 2 °C/min to 100 °C/min(at the isothermal temperature of −75 °C), (iii) magnetic nanoparticles coated by both PEG and CA could promote the devitrification of Vs55, for instance, without any crystal growth inside Vs55 at the isothermal temperature of −80 °C, but 1.04 and 2.31 μm/s for adding magnetic nanoparticles coated by CA and PEG, respectively. Compared with the samples coated by CA, PEG promoted the devitrification of Vs55 in a much more positive way, and the ice growth rates were 0.62 and 6.25 μm/s at the isothermal temperatures of −85 and −75 °C, respectively. These results indicate that the surface coating of MNPs could significantly affect the recrystallization of Vs55, and further work should be conducted in the future research.