揭示卷烟过滤嘴多孔异质材料中分子和颗粒的运动轨迹

IF 1.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Express Pub Date : 2024-08-06 DOI:10.1088/2053-1591/ad695a
Sheng Lei, Ling Zhang, Kai Wang, Chunbo Liu, Xianyi Li, Zhongqiu Tang and Lingxiang Jiang
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引用次数: 0

摘要

多孔结构中的分子动力学和质量传输为我们了解多孔约束中的催化、能量存储和产生以及生物过程提供了基础。传统方法是以集合平均的方式提取宏观信息,而我们则打算通过跟踪单个物体在真实空间和实时中的动态,跟踪与香烟滤嘴相关的多孔结构中单个粒子和分子的运动轨迹。不同大小的纳米颗粒被嵌入琼脂糖纤维框架中,其中小颗粒(50 纳米)可以探索孔隙及其连接,局部绘制出多孔结构图;中等大小的颗粒(100 纳米)被困在单个孔隙中波动;而大颗粒(500 纳米)则被周围的纤维完全固定。该模型系统与香烟过滤嘴中常用的纤维素对焦油颗粒或其他颗粒物质的截留和过滤有关。将分子示踪剂装载到沸石基多孔结构中,其中大部分分子通过吸附或微孔捕获固定在空间,在 10 纳米半径范围内呈现局部轨迹,而少数分子则具有流动性,可探查大孔。这种分子体系可以阐明多环芳烃等芳香族分子是如何在微孔、中孔和大孔混合的基质中被吸附和迁移的。
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Revealing the journey of molecules and particles in heterogeneous, porous materials for cigarette filters
Molecular dynamics and mass transportation in porous structures provide a basis for us to understand catalysis, energy storage and generation, and biological processes in porous confinements. While conventional methods extract macroscopic information in an ensemble-averaged manner, we intend to follow the journey of individual particles and molecules in porous structures relevant to cigarette filters by tracking the single-object dynamics in real space and real time. Nanoparticles of various sizes are embedded in fibrous frameworks of agarose where small particles (50 nm) can explore pores and their connections, locally mapping out the porous structure, middle-sized particles (100 nm) are trapped in single pores to fluctuate within, and large particles (500 nm) are fully immobilized by surrounding fibers. This model system is relevant to the retention and filtration of tar particles or other kinds of particulate matters by fibrous cellulose frequently used in cigarette filters. A molecular tracer is loaded to zeolite-based porous structures, where the majority are fixated in space by adsorption or micropore trapping, exhibiting localized trajectories within a 10-nm radius, and the minority are mobile to scout macropores. This molecular system may elucidate on how aromatic molecules like PAHs are adsorbed and transported in a matrix of mixed micro-, meso-, and macropores.
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来源期刊
Materials Research Express
Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
4.50
自引率
4.30%
发文量
640
审稿时长
12 weeks
期刊介绍: A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.
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