Drobež Katja, Popov Nina, Lisjak Darja
Department for Material Synthesis, Jožef Stefan Institute 1000 Ljubljana Slovenia
Jožef Stefan International Postgraduate School 1000 Ljubljana Slovenia.
Nanoscale Adv. 2025 Jun 11. doi: 10.1039/d4na01035c.
In this study, barium hexaferrite nanoplatelets (BHF NPLs) were functionalized with different catechols, pyrocatechol (CAT), dopamine (DA), and caffeic acid (CAFA). Possible adsorption mechanisms, structural effects, and their potential impact on the functionalization and decomposition of the NPLs were investigated. We synthesized the BHF NPLs hydrothermally and functionalized them with catechols in an aqueous suspension (pH = 3) using ultrasonication or heating at 80 °C. We characterized the morphologies and size distributions of the core and functionalized BHF NPLs using transmission electron microscopy (TEM). The functionalization of the BHF NPLs was followed by electrokinetic measurements and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Mass fractions of ligands in the functionalized samples were determined by thermogravimetric analysis (TGA), and the room-temperature magnetic properties of the core and functionalized BHF NPLs were measured with a vibrating-sample magnetometer (VSM). The analyses showed that CAT and CAFA attached stably under the studied conditions, whereas the attachment of DA with an electron-donating group was labile. Chemical analysis of the dissolved iron ions performed with inductively coupled plasma-optical emission spectroscopy (ICP-OES) revealed that catechols enhanced the decomposition of the BHF NPLs at acidic pH.
在本研究中，用不同的儿茶酚（邻苯二酚（CAT）、多巴胺（DA）和咖啡酸（CAFA））对六方铁酸钡纳米片（BHF NPLs）进行功能化处理。研究了可能的吸附机制、结构效应及其对纳米片功能化和分解的潜在影响。我们通过水热法合成了BHF NPLs，并在水悬浮液（pH = 3）中使用超声或在80℃加热的方式用儿茶酚对其进行功能化处理。我们使用透射电子显微镜（TEM）对核心BHF NPLs和功能化BHF NPLs的形态和尺寸分布进行了表征。对BHF NPLs进行功能化处理后，进行了电动电位测量和漫反射红外傅里叶变换光谱（DRIFTS）分析。通过热重分析（TGA）测定功能化样品中配体的质量分数，并用振动样品磁强计（VSM）测量核心BHF NPLs和功能化BHF NPLs的室温磁性。分析表明，在研究条件下，CAT和CAFA能稳定附着，而带有供电子基团的DA的附着不稳定。用感应耦合等离子体发射光谱（ICP - OES）对溶解的铁离子进行化学分析表明，儿茶酚在酸性pH条件下会促进BHF NPLs的分解。
