Electrical Tortuosity in Nanostructured Mesoporous Silica Powder and Nanocomposite Membranes

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Transport in Porous Media Pub Date : 2024-06-14 DOI:10.1007/s11242-024-02095-8
Dessie Belay Emrie
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Abstract

Polymer silica nanocomposites are advanced materials with unique properties combining the advantages of an inorganic nanofiller and the organic polymer matrix, which attracted considerable interest for applications in energy conversion and storage, drug delivery, environmental remediation, and many more. However, the dispersion of the nanofiller in the polymer matrix leads to complexified nanocomposite materials whose barrier properties are altered resulting in a tortuous pathway for the transport of current, matter, and velocity. The tortuosity of these nanocomposite materials, which depends on their porosity organization, is a parameter usually challenging to quantify accurately. Therefore, the objective of this study was to develop a method to quantify the electrical tortuosity and to develop a theoretical model to accurately predict electrical tortuosity in these in-house prepared silica powder and nanocomposite membrane materials at different porosity ranges. The SBA-15 silica powder and nanocomposite membranes’ conductivity was measured with the help of impedance spectroscopy in a 1 M sodium chloride electrolyte solution from which the electrical tortuosity is quantified. The calculated tortuosity of SBA-15 silica powder was found to be well correlated to the entire range of its porosity. The plots of the tortuosity versus porosity from the Maxwell and the modified Maxwell models showed a well-fitted curve to the entire range of porosity. These theoretical models will help to give a perfect prediction of the electrical tortuosity of materials from porosity measurements, which would be a vital technique to characterize materials used in electrochemical devices and battery technology.

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纳米结构介孔二氧化硅粉末和纳米复合膜中的电曲度
聚合物二氧化硅纳米复合材料是一种先进的材料,具有独特的性能,结合了无机纳米填料和有机聚合物基体的优点,在能源转换和储存、药物输送、环境修复等领域的应用引起了广泛的兴趣。然而,纳米填料在聚合物基体中的分散会导致纳米复合材料的复杂化,其阻隔特性会发生改变,从而导致电流、物质和速度的传输路径变得曲折。这些纳米复合材料的迂回度取决于其孔隙度组织,通常是一个难以准确量化的参数。因此,本研究的目的是开发一种量化电迂回度的方法,并建立一个理论模型,以准确预测内部制备的硅粉和纳米复合膜材料在不同孔隙率范围内的电迂回度。在 1 M 氯化钠电解质溶液中,利用阻抗光谱法测量了 SBA-15 硅粉和纳米复合膜的电导率,并从中量化了电扭曲度。结果发现,计算得出的 SBA-15 硅粉曲折度与其整个孔隙率范围密切相关。根据麦克斯韦模型和修正的麦克斯韦模型绘制的曲折度与孔隙率曲线图显示,整个孔隙率范围的曲线拟合良好。这些理论模型将有助于根据孔隙率测量结果完美预测材料的电扭曲度,这将是表征电化学装置和电池技术中所用材料的重要技术。
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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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