The microstructure of samples was investigated using field emission scanning electron microscopy.
The surface morphologies of the samples were analyzed using field emission scanning electron microscopy (FE-SEM, Nova Nano 200).
The appearance of the samples was studied using field emission scanning electron microscopy (FE-SEM) (JEOL JSM-7800 F, Japan).
The morphology of the samples was observed using field emission scanning electron microscope (FESEM; S4800, Hitachi Corp., Chiyoda-ku, Japan).
The morphologies of samples were observed using field emission scanning microscopy (FESEM, JEOL JSM-6700F, Akishima-shi, Japan) with an accelerated voltage of 3 kV.
The microstructures and morphologies of the samples were examined using field emission scanning electron microscopy (FE-SEM) and energy-dispersive X-ray spectroscopy (EDS).
To study the effect of water penetration in the fibre/matrix interface, fractured samples were examined using field emission scanning electron microscopy (FESEM).
The morphologies of the samples were characterized using field emission scanning electron microscopy and a microscope equipped with an energy-dispersive X-ray spectrometer (EDX) (FEI, Sirion200) and TEM JEM-2100FF, Japan Japan).
The morphologies and microstructures of the samples were examined using field emission scanning electron microscopy (FESEM; JEOL-6500, JEOL Ltd., Tokyo, Japan) and transmission electron microscopy (TEM; JEOL 2100; operated under 200 eV), respectively.
The effect of fine grinding and ball milling on morphology of PbO samples was studied using field emission scanning electron microscopy (FESEM, JEOL JSM-600F, Japan) with an acceleration voltage of 15 kV.
