Université Savoie Mont Blanc, Laboratoire Chimie Moléculaire et Environnement (LCME), 73000 Chambéry, France.
Université Claude Bernard Lyon 1, Université de Lyon, Laboratoire Ingénierie des Matériaux Polymères (IMP), CNRS UMR 5223, 69622 Villeurbanne Cedex, France.
Int J Biol Macromol. 2019 May 15;129:68-77. doi: 10.1016/j.ijbiomac.2019.01.216. Epub 2019 Feb 1.
This work emphazises the importance of the solubilizing conditions for the elaboration of chitosan hydrogel beads, which were produced using electromagnetic laminar jet breakup technology, resulting in dried porous beads by further freeze-drying. Paramaters such as the acid nature and concentration (acetic, formic, citric, lactic, maleic and malic, 0.1 to 0.5 mol·L), the chitosan concentration (2 to 5 wt%) and composition of the gelation bath (NaOH, with or without EtOH) were studied. Viscosity versus strain rate measurements were carried out on chitosan acidic solutions and the viscoelastic behaviour was studied on hydrogels. The solutions exhibiting the highest viscosities led to the stiffest macrohydrogels, as a result of chitosan carboxylate interactions. Specific surface areas of the freeze-dried beads were determined in the range from 12 to 107 m·g. Their internal texture was observed by Scanning Electron Microscopy. Water uptake was also measured for further use in the field of water purification.
这项工作强调了为制备壳聚糖水凝胶珠而进行溶胀条件的重要性，这些水凝胶珠是使用电磁层流射流破裂技术制备的，通过进一步冷冻干燥得到干燥的多孔珠。研究了酸的性质和浓度（乙酸、甲酸、柠檬酸、乳酸、马来酸和苹果酸，0.1 至 0.5 mol·L）、壳聚糖浓度（2 至 5 wt%）和凝胶浴组成（NaOH，带或不带 EtOH）等参数。在壳聚糖酸性溶液上进行了粘度与应变速率的测量，并对水凝胶进行了粘弹性研究。由于壳聚糖羧酸盐的相互作用，表现出最高粘度的溶液导致最硬的宏观水凝胶。通过测定冻干珠的比表面积在 12 至 107 m·g 范围内来确定。通过扫描电子显微镜观察其内部结构。还测量了水的吸水量，以便进一步用于水净化领域。
