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工程纳米容器在低和高离子强度介质中的表征和行为
Violeta Ferreira1, Joana Figueiredo1, Roberto Martins1
1CESAM-Centre for Environmental and Marine Studies & Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal.
Nanomaterials (Basel, Switzerland)
|June 10, 2023
概括
与DCOIT (SiNC-DCOIT) 装载的半孔纳米容器 (SiNC) 和SiNC在水性介质中显示出不稳定性. 不同离子强度的聚合可能会增加沉积和对海洋生物的风险.
科学领域:
- 材料科学:纳米材料
- 环境科学:生态毒理学
- 化学:合体和表面化学.
背景情况:
- 半孔纳米容器 (SiNC) 因其药物载体能力而被用于涂料中.
- 装有生物制剂的SiNC,如DCOIT,被建议用于防海洋涂料.
- 离子介质中的纳米材料不稳定性会影响其特性和环境命运.
研究的目的:
- 研究SiNC和SiNC-DCOIT在具有不同离子强度的水性介质中的行为.
- 评估离子强度对纳米材料形态,尺寸和泽塔潜力的影响.
- 了解聚合模式及其对环境风险的影响.
主要方法:
- 在基于超纯水 (UP) 和人工海水 (ASW) 的介质 (ASW和f/2介质) 中分散SiNC和SiNC-DCOIT.
- 描述纳米材料的形态,尺寸和泽塔潜力 (ζP) 随着时间的推移和不同度.
- 在对离子强度变化的反应中分析聚合现象.
主要成果:
- 无论是SiNC还是SiNC-DCOIT,都在水中悬浮时表现出不稳定性,在UP时的初始 ζP 值低于-30 mV.
- 在UP中随着时间的推移而发生聚合,SiNC的粒子大小在148-235nm之间,SiNC-DCOIT的粒子大小在153-173nm之间.
- 在ASW中,聚合物 (<300 nm) 无论时间或度如何形成;更大,异质结构 (>300 nm) 出现在f/2介质中.
结论:
- SiNC和SiNC-DCOIT的聚合模式受到离子强度的影响.
- 增加聚合可能会导致沉积速度更快,可能会增加海洋生物的暴露风险.
- 了解纳米材料在不同水环境中的行为对于评估环境安全至关重要.
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