Khouchaf Lahcen, Oufakir Abdelhamid
IMT Nord Europe, Institut Mines-Telecom, University Lille, Centre for Materials and Processes, F-59000 Lille, France.
Department of Chemistry, Faculty of Science, Cadi Ayyad University, Marrakech 40000, Morocco.
Molecules. 2024 Dec 13;29(24):5898. doi: 10.3390/molecules29245898.
Understanding the relationship between elastic, chemical, and thermal properties is essential for the prevention of the behavior of SiO flint aggregates during their application. In fact, the elastic properties of silica depend on chemical and heat treatment. In order to identify the crystallite sizes for natural SiO before and after chemical treatment samples, Williamson-Hall plots and Scherer's formulas are used. The silica nanofibers obtained and their microstructure changes under thermal and chemical treatment are characterized using different techniques (XRD, VP-SEM, TEM, FTIR, TDA, and TGA). Both the strains (ε) and the crystallite sizes (DW-H) are obtained from the slope and from the βcosθ-intercept of a graph, respectively. The crystalline quality is improved upon heating, as shown by the decrease in the FWHM of the SiO(101) peaks, which is confirmed by Fourier transform infrared spectroscopy (FTIR). The microstrain estimated at 1.50 × 10 units for natural SiO is smaller than that for SiO after chemical attack which is estimated at 2.01 × 10 units. Based on the obtained results, SiO characterized with controlled micromechanical, thermal, and chemical properties may be used as a filler to improve the performance properties of the strength, microstructure, and durability of some composites.
了解弹性、化学和热性能之间的关系对于防止SiO燧石聚集体在应用过程中的行为至关重要。事实上，二氧化硅的弹性性能取决于化学和热处理。为了确定化学处理前后天然SiO的微晶尺寸，使用了威廉姆森-霍尔图和谢勒公式。使用不同技术（XRD、VP-SEM、TEM、FTIR、TDA和TGA）对获得的二氧化硅纳米纤维及其在热和化学处理下的微观结构变化进行表征。应变（ε）和微晶尺寸（DW-H）分别从图的斜率和βcosθ截距获得。加热后晶体质量得到改善，如SiO(101)峰的半高宽减小所示，这通过傅里叶变换红外光谱（FTIR）得到证实。天然SiO估计的微应变为1.50×10单位，小于化学侵蚀后SiO估计的2.01×10单位。基于所得结果，具有可控微机械、热和化学性能的SiO可用作填料，以改善某些复合材料的强度、微观结构和耐久性等性能。
