Nanosized r-nickel hydroxide with an interlayer spacing of 7.2 Å has been synthesized with the aid of ultrasound radiation. This method was found to be a simple and convenient method to produce r-nickel hydroxide. The synthesized hydroxide was found to possess good stability in KOH medium and the material might be interesting from the application point of view in secondary alkaline batteries. The r-nickel hydroxide has been characterized by powder X-ray diffraction, transmission electron microscopy, DSC, thermogravimetric analysis, FT-IR spectroscopy, and elemental analysis.

Amorphous silver nanoparticles of ca. 20 nm size have been prepared by the sonochemical reduction of an aqueous silver nitrate solution in an atmosphere of argon-hydrogen. The silver nanoparticles have been characterized by TEM, X-ray diffraction, absorption spectroscopy, differential scanning calorimetry and EPR spectroscopy. The mechanism of the sonochemical reduction has been discussed, and occurs through the generation of hydrogen radicals during the sonication process.Today, nanoparticles have become the focus of intensive ( TEM ). The silver nanoparticles are also characterized using powder X-ray diffraction ( XRD), plasmon spectroscopy, research, owing to their numerous applications in diverse fields differential scanning calorimetry (DSC ), and EPR such as catalyst production, ultramodern electronic and elecspectroscopy. trooptical devices, supermagnets, photographic suspensions, etc.1,2Nanoparticles have a large surface-to-volume ratio, and

Powders of nanocrystalline metal oxides were compared with common macrocrystalline powders and minerals for their ability to reflect near-infrared light (NIR) (750−2500 nm). The nanocrystalline metal oxides were found to possess higher NIR reflectance values (∼15−20%) and this can be attributed to their smaller crystallite sizes coupled with smaller mean aggregate sizes in accordance with the Kubelka−Munk theory.

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