Cruz-Quesada Guillermo, Espinal-Viguri Maialen, López-Ramón María Victoria, Garrido Julián J
Departamento de Ciencias, Edif. Los Acebos, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain.
Institute for Advanced Materials and Mathematics, Edif. Jerónimo de Ayanz, Campus Arrosadía, Public University of Navarre, 31006 Pamplona, Spain.
Polymers (Basel). 2021 Apr 27;13(9):1415. doi: 10.3390/polym13091415.
Hybrid silica xerogels combine the properties of organic and inorganic components in the same material, making them highly promising and versatile candidates for multiple applications. They can be tailored for specific purposes through chemical modifications, and the consequent changes in their structures warrant in-depth investigation. We describe the synthesis of three new series of organochlorinated xerogels prepared by co-condensation of tetraethyl orthosilicate (TEOS) and chloroalkyltriethoxysilane (ClRTEOS; R = methyl [M], ethyl [E], or propyl [P]) at different molar ratios. The influence of the precursors on the morphological and textural properties of the xerogels was studied using Si NMR (Nuclear Magnetic Resonance), FTIR (Fourier-Transform Infrared Spectroscopy), N, and CO adsorption, XRD (X-ray Diffraction), and FE-SEM (Field-Emission Scanning Electron Microscopy). The structure and morphology of these materials are closely related to the nature and amount of the precursor, and their microporosity increases proportionally to the molar percentage of ClRTEOS. In addition, the influence of the chlorine atom was investigated through comparison with their non-chlorinated analogues (RTEOS, R = M, E, or P) prepared in previous studies. The results showed that a smaller amount of precursor was needed to detect ordered domains (ladders and T cages) in the local structure. The possibility of coupling self-organization with tailored porosity opens the way to novel applications for this type of organically modified silicates.
杂化二氧化硅干凝胶在同一材料中结合了有机和无机成分的特性，使其成为多种应用中极具潜力和多功能性的候选材料。它们可以通过化学修饰来定制以满足特定目的，并且其结构的相应变化值得深入研究。我们描述了通过正硅酸四乙酯（TEOS）和氯烷基三乙氧基硅烷（ClRTEOS；R = 甲基[M]、乙基[E]或丙基[P]）以不同摩尔比共缩合制备的三个新系列有机氯化干凝胶的合成。使用硅核磁共振（Si NMR）、傅里叶变换红外光谱（FTIR）、N₂和CO₂吸附、X射线衍射（XRD）以及场发射扫描电子显微镜（FE-SEM）研究了前驱体对干凝胶形态和织构性质的影响。这些材料的结构和形态与前驱体的性质和用量密切相关，并且它们的微孔率与ClRTEOS的摩尔百分比成比例增加。此外，通过与先前研究中制备的非氯化类似物（RTEOS，R = M、E或P）进行比较，研究了氯原子的影响。结果表明，检测局部结构中的有序域（梯子和T笼）所需的前驱体用量较少。将自组装与定制孔隙率相结合的可能性为这类有机改性硅酸盐的新应用开辟了道路。
