Theoretical and experimental approaches to the electro-optical study of boehmite nanoparticles with given morphology

Transformation process of boehmite to γ-Al2O3 induced by high-energy ball milling

“…3 The N 2 temperature adsorption-desorption isotherms of the milled samples as a function of milling duration. to the asymmetric and symmetric stretching vibrations of (Al)O-H. 28 With the extension of milling duration, the attenuation of the characteristic peaks (∼1080 cm −1 , ∼1160 cm −1 , ∼3100 cm −1 , and ∼3300 cm −1 ) representing hydroxyl groups in all samples signified that mechanical ball milling induced and altered the crystallite size and amorphization of samples, 29,30 which agreed well with the observation of XRD spectrums. Additionally, the alterations in the displacement and the reduction in the peak intensity at around 490 cm −1 , 630 cm −1and 750 cm −1 , corresponding to AlO 6 could be observed, where two peaks at 490 cm −1 and 750 cm −1 almost merged with the central peak at 630 cm −1 , suggesting that the content of AlO 6 had decreased with further milling, which was in agreement with the 27 Al NMR results.…”

“…27 The peaks at 3100 cm −1 and 3300 cm −1 were likely ascribed to the asymmetric and symmetric stretching vibrations of (Al)O–H. 28…”

Synthesis and Characterization of Boehmite Particles Obtained from Recycling: Water Disinfection Application

“…The boehmite sample morphology (Figure 4a) presented irregular plates, as reported for products obtained using the same pH as this study [37]. To distinguish boehmite and Ag particles and to determine the Ag-NP density distribution, the Ag-loaded boehmite samples were visualized in the back scattered electron (BSE) mode of SEM (BSE-SEM) (Figure 4b,d).…”

Оптический Эффект В Магнитных Эмульсиях При Воздействии Магнитного Поля

“…Измерение времени вращательной броуновской релаксации для сильно вытянутых частиц широко используется в электрооптических исследованиях для определения размеров и формы макромолекул [33] и других частиц органической и неорганической природы по кривым нарастания или спада электрооптического эффекта (двойного лучепреломления, дихроизма, изменения прозрачности или интенсивности рассеянного света) [34], а также данным динамического рассеяния поляризованного света [35]. Для вытянутых микрокапель с радиусом эквиобъемной сферы r 0 , взвешенных в среде с эффективной вязкостью η eff , выражение для времени вращательной броуновской релаксации оптического эффекта можно записать в виде:…”