无形纳米颗粒在溶液中和热干燥过程中的生长机制
Akshay Narula1, Da Hye Yang1, Paroma Chakravarty2
1Department of Pharmaceutical Sciences, University of Connecticut, 69 North Eagleville Road Unit 3092, Storrs, CT 06269, United States.
Journal of pharmaceutical sciences
|August 26, 2024
概括
无形纳米粒子很容易变形,这给配方带来了挑战. 它们在溶液中和干燥过程中的生长机制严重取决于玻璃过渡温度 (Tg),影响稳定性和加工.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 物理化学 物理化学
背景情况:
- 无形纳米粒子提供了生产优势和多样化的应用,特别是在药物输送中.
- 然而,它们的机械不稳定性和易变形性会给制剂和加工带来重大挑战.
- 了解它们的生长机制对于开发稳定,可重新分散的无形纳米粒子配方至关重要.
研究的目的:
- 确定无形纳米颗粒在溶液中和高温干燥过程中的生长机制.
- 为优化工艺条件和为无形纳米粒子配方选择稳定剂提供指导.
- 阐明玻璃过渡温度 (Tg) 在纳米粒子稳定性中的作用.
主要方法:
- 使用液-液相分离来制备无形纳米粒子.
- 在溶液中和在热干燥过程中研究了颗粒生长机制.
- 分析了相对于玻璃过渡温度 (Tg) 的温度的影响.
主要成果:
- 在溶液中,无形纳米粒子容易发生花,结晶,凝聚和奥斯瓦尔德成熟,凝聚开始奥斯瓦尔德成熟.
- 在热干燥过程中,凝聚和结晶主导了颗粒的生长,而由于分子流动性减少,奥斯瓦尔德成熟变得可以忽略不计.
- 玻璃过渡温度 (Tg) 是一个关键因素:在Tg以下,粒子是刚性的;在Tg或以上,它们变得可变形,容易凝聚.
结论:
- 该研究确定了溶液中和干燥过程中无形纳米颗粒的关键生长机制.
- 粒子行为受到玻璃过渡温度 (Tg) 的强烈影响,决定了从刚性到可变形状态的过渡.
- 这种机制的理解有助于设计稳定的无形纳米粒子配方,并优化软纳米粒子的加工条件.
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