This paper reports the effect of aging time (2, 4 and 6 days) on the formation of mesoporous mitania nanoparticles (MTN) prepared via sol-gel method. The structural properties of the prepared catalysts were investigated by X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM) with EDX analysis and N2 adsorption-desorption analysis (BET). The XRD analysis revealed that MTNs were successfully synthesized and possessed different crystallite size depending on the aging time. Morphology studies using FESEM-EDX witnessed the formation of agglomerated spherical nanoparticles in the range of 5-50 nm and uniform distribution of Ti and O on the surface of catalysts. N2 adsorption-desorption analyses demonstrated MTN-2 possessed the largest surface area and pore volume compared to the MTN-4 and MTN-6, which due to blockage of the interparticle voids and excessive particles growth of MTN upon prolonged aging time. The MTN-2 achieved 88.35% of MB photodegradation within 210 m.....

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The use of Palladium (Pd) as a substrate for studying graphene growth presents a unique avenue of exploration. Pd is known as a "carbon sponge" with extensively studied carbon solubility and diffusivity. This study uses Pd as a catalyst for studying graphene growth, revealing a solid-phase reaction process in in-situ transmission electron microscopy (TEM). The study reveals significant structural changes in amorphous carbon nanofibers (CNF) catalyzed with Pd when electrical potential is applied through two-probe system. Notably, the gradual recrystallization and agglomeration of Pd particles, beginning in the middle segment of the CNF and advancing toward the end, were observed under high current flow ranging from 0.35 µA to 12 µA. This transformation, influenced by joule heating and significant thermal gradients, led to the crystallization of amorphous carbon, resulting in sp2 hybridized carbon formation and the formation of graphene sheets starting from the Pd surface's tip. Struct.....

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