在水性甘油溶液中的水凝珠的膨胀动力学
Sebastian Falcioni1, Yanina Lucrecia Roht1, Germán Drazer2
1Universidad de Buenos Aires, Facultad de Ingeniería, Grupo de Medios Porosos, Paseo Colón 850, 1063 Buenos Aires, Argentina.
The journal of physical chemistry. B
|September 20, 2024
概括
聚烯胺水凝珠在糖溶液中随着粘度的增加而膨胀得更慢. 这种胀行为显示出普遍的动力学,表明溶液透的粘性主导的运输机制.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 水凝被广泛用于各种应用,因为它们能够吸收大量的水.
- 了解水凝的膨胀动力学对于优化它们在不同环境中的性能至关重要.
- 糖溶液通常用于修改水性环境的特性,可能会影响水凝的行为.
研究的目的:
- 为了研究聚烯胺水凝珠在水溶液中的胀动力学.
- 为了确定甘油度和溶液粘度对水凝胀的影响.
- 探索控制膨胀过程的潜在运输机制.
主要方法:
- 制备聚烯胺水凝珠的方法.
- 在不同度的水性甘油溶液中进行的胀实验.
- 重力测量分析以测量随时间的推移吸收的质量.
- 对溶液的粘度进行测量.
- 开发和应用一种新的可视化技术来观察内部水凝结构.
- 对膨胀动力学和核心外结构演变的分析.
主要成果:
- 无论糖的度如何,水凝珠的总吸收质量保持不变.
- 随着葡萄糖度 (因此粘度) 的增加,胀率显著降低.
- 吸收容量曲线表明,当时间由依赖于溶液粘度的特征时间重新调整时,普遍动力学.
- 视觉化显示,在早期的胀阶段,有一个核心外结构.
- 核心外结构的演变显示出恒定的前速,表现出与重新缩放时间的普遍行为.
结论:
- 甘油度,主要是通过其对溶液粘度的影响,控制水凝膨胀的速度.
- 膨胀过程是由粘性主导的传输机制控制的.
- 观察到的通用动力学和恒定前速为溶液透到水凝的物理提供了洞察力.
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