电纺丝法高效制备介孔氧化铝纳米纤维：提高陶瓷与聚合物的比率

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-05-01 DOI:10.1016/j.ceramint.2025.01.550

Leila Sohrabi-Kashani, Seyyed Masih Madani, Hajar Ghanbari, Hossein Sarpoolaky

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引用次数: 0

摘要

本文以薄水铝石、聚乙烯醇和硅溶胶为原料，采用静电纺丝法制备氧化铝介孔纳米纤维。使用静电纺丝法生产柔性和连续陶瓷纤维是具有挑战性的，因为煅烧后再去除聚合物。使用薄水铝石可以在不影响静电纺丝工艺的情况下将陶瓷/聚合物前驱体比提高三倍，这将大大提高纤维的质量并降低纤维的脆性。采用x射线衍射（XRD）分析了经过550、750和950℃热处理的纯氧化铝和氧化铝-硅纤维样品的物相演变。场发射电镜（FESEM）分析表明，纤维的直径随着二氧化硅的加入和煅烧温度的升高而减小。经950℃热处理后，氧化铝-二氧化硅纤维的直径可达210±50 nm ~ 160±50 nm。利用傅里叶变换红外光谱（FTIR）对纳米纤维进行了表征，研究了其化学性质。同时热重分析（STA）表明，薄水铝石和PVA的共存表现出不同的热行为，二氧化硅的存在延缓了薄水铝石随温度升高的相变。合成的γ-Al2O3介孔纤维的比表面积为204 m2/g，平均孔径为9.5 nm，是催化剂载体应用的理想候选材料。

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Cost-effective fabrication of mesoporous alumina nanofibers via electrospinning: Enhanced ceramic-to-polymer ratio

In this paper, inexpensive precursors, such as boehmite, PVA, and silica sol, were used to fabricate alumina mesoporous nanofibers by electrospinning. Producing flexible and continuous ceramic fibers using the electrospinning method is challenging due to the calcination followed by polymer removal. Using boehmite made it possible to increase the ceramic/polymer precursor ratio up to three times without disturbing the electrospinning process, which will extensively improve the quality and decrease the brittleness of the fibers. The phase evolution of the pure alumina and alumina-silica fiber samples heat-treated at 550, 750, and 950 °C were investigated by X-ray diffraction (XRD) analysis. Field-emission electron microscopy (FESEM) analysis showed that the diameter of fibers decreased with the addition of silica and increased calcination temperature. The diameter of alumina-silica fibers reached from 210 ± 50 nm to 160 ± 50 nm after heat treatment at 950 °C. The nanofibers were also characterized by Fourier-transform infrared (FTIR) spectroscopy to investigate their chemical properties. Simultaneous thermogravimetric analysis (STA) indicated that the coexistence of boehmite and PVA shows different thermal behavior, and the presence of silica retards the phase transformations of boehmite as the temperature increases. The as-synthesized γ-Al₂O₃ mesoporous fibers exhibited a surface area of 204 m²/g with an average pore diameter of 9.5 nm, which makes it an acceptable candidate for catalyst support applications.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.