Graduate School of Human Life Science, Osaka City University, Sugimoto, Sumiyoshiku, Osaka 558-8585, Japan; The High Pressure Research Center of Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
Graduate School of Engineering, Osaka City University, Sugimoto, Sumiyoshiku, Osaka 558-8585, Japan.
Int J Biol Macromol. 2014 Mar;64:409-14. doi: 10.1016/j.ijbiomac.2013.12.021. Epub 2013 Dec 19.
In situ observation of heat- and pressure-induced gelation of methylcellulose (MC) aqueous solution has been studied by using dynamic viscoelastic and fluorescence measurements. The storage modulus G' decreased gradually first on heating, and then leveled off in the temperature range from 25 °C to 75 °C. Methylcellulose solutions were subjected to pressures up to 450 MPa by using a high pressure cell. It was indicated that the microviscosity showed a dramatic change in the vicinity of the phase transition point. The T vs. P phase diagram of methylcellulose aqueous solution was constructed, and it indicated that the melting point was an increasing function of pressure. In situ microscopic observation of pressure-induced gelation of methylcellulose aqueous solution was also performed with a microscope, and it could be seen that gel phase of the sample disappeared and sol formed gradually. Pressure-released study by fluorescence measurement also showed that the phase transition of MC solution was reversible.
通过动态黏弹性和荧光测量研究了甲基纤维素（MC）水溶液的热和压力诱导胶凝的原位观察。在加热过程中，储能模量 G' 首先逐渐降低，然后在 25°C 至 75°C 的温度范围内趋于稳定。使用高压池将甲基纤维素溶液加压至高达 450 MPa。结果表明，在相变点附近，微黏度发生了显著变化。构建了甲基纤维素水溶液的 T 与 P 相图，表明熔点是压力的增函数。还通过显微镜对甲基纤维素水溶液的压力诱导胶凝进行了原位微观观察，可以看出样品的凝胶相逐渐消失并形成溶胶。荧光测量的压力释放研究也表明 MC 溶液的相变是可逆的。
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