相关实验视频

Updated: Jan 8, 2026

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies

Published on: July 27, 2022

老化对纳米塑料聚合和释放低密度聚乙烯 (LDPE) 的影响

Somayeh Saliminasab¹, Tao Cheng¹

¹Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador A1B 3X5, Canada.

Journal of contaminant hydrology

|December 16, 2025

概括

热和紫外线处理等老化过程显著影响低密度聚乙烯的纳米塑料 (NP) 生产和聚合. 了解这些老的NP对于预测它们的环境命运至关重要.

科学领域:

环境科学环境科学
聚合物科学聚合物科学
纳米技术纳米技术

背景情况:

塑料污染,特别是来自纳米塑料 (NP),由于其移动性和毒性,造成了重大环境风险.
现有的研究经常使用人工原始的NP,这些NP可能不能准确地反映现实世界的条件.
了解老年NP的行为对于准确的环境风险评估至关重要.

研究的目的:

在经过老化处理 (紫外线照射和热) 后,研究从低密度聚乙烯 (LDPE) 中获得的纳米塑料 (NP) 的聚合.
分析衰老对NP物理化学性质的影响以及各种电解质溶液中的聚合行为.
开发和验证一个模拟NP聚合动学的数学模型.

主要方法:

在衰老后的NP的物理化学表征.
纳米塑料聚合实验在电解质溶液中进行,pH值和离子价值差异不同.
应用德贾古恩-兰多-维维-奥弗比克 (DLVO) 理论来解释聚合.
开发一个数学模型来模拟NP聚合动力学.

主要成果:

热处理显著增强了LDPE的NP生成,改变了表面电荷,影响了聚合.
紫外线衰老的NP表现出复杂的聚合行为,可能是由于与Ca2+的桥梁效应.
衰老,pH和阴离子价值是影响NP聚合的关键因素,主要由DLVO理论解释.
开发的模型有效地模拟了观察到的NP聚合动力学.

结论:

老化过程极大地影响了纳米塑料的产生和聚合动态.
现实世界老化的纳米塑料与人造原始代理物有着不同的行为,突出了当前模型的局限性.
对老化纳米塑料的进一步研究对于准确的环境命运和运输预测至关重要.

关键词:

聚合是一种聚合.衰老的衰老衰老的衰老在LDPE中使用LDPE.纳米粒子释放的释放方式纳米塑料的纳米塑料物理化学性质物理化学性质

更多相关视频

PLGA Nanoparticles Formed by Single- or Double-emulsion with Vitamin E-TPGS

PLGA Nanoparticles Formed by Single- or Double-emulsion with Vitamin E-TPGS

Published on: December 27, 2013

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use

Published on: July 24, 2021

相关概念视频

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...

Polymer Classification: Architecture

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

Free-Radical Chain Reaction and Polymerization of Alkenes

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...