RESUMO
BaTiO3 (BT) powder, with average particle size of 1.4 microm, was synthesized by solid-state reaction. A high-intensity ultrasound irradiation (ultrasonication) was used to de-agglomerate micro-sized powder to nano-sized one. The crystal structure, crystallite size, morphology, particle size, particle size distribution, and specific surface area of the BT powder de-agglomerated for different ultrasonication times (0, 10, 60, and 180 min) were determined. It was found that the particles size of the BT powder was influenced by ultrasonic treatment, while its tetragonal structure was maintained. Therefore, ultrasonic irradiation can be proposed as an environmental-friendly, economical, and effective tool for the de-agglomeration of barium titanate powders.
Assuntos
Bário/química , Titânio/química , Química Farmacêutica , Cristalização , Microscopia Eletrônica de Varredura , Tamanho da Partícula , Pós , Sonicação , Propriedades de Superfície , Ultrassom , Difração de Raios XRESUMO
Controversy surrounds the value of optic magnification for peripheral nerve surgery. The aim of this study was to compare the loupe magnification with microscope-assisted techniques in a rat tibial nerve graft model. The parameters studied included motor nerve conduction velocity (MNCV), clinical test equivalent (CTE), soleus muscle weight (SMW) and morphometric nerve indices. In the loupe and microscope groups MNCV mean was 26.77 +/- 9.37 m/sec and 44.19 +/- 11.36 m/sec respectively. MNCV results suggest better regeneration in the microscope group, as confirmed by CTE, SMW and myelinated fibre (MF) diameter.