The corrosion inhibition of thiadiazole derivatives for brass in natural seawater has been evaluated by potentiodynamic polarisation and electrochemical impedance spectroscopic techniques. It was found that the inhibition efficiency of the thiadiazole derivatives, namely, 2-amino-5-ethyl-1,3,4- thiadiazole(AETD), 2-amino-5-ethylthio-1,3,4-thiadiazole(AETTD) and 2-amino-5-tert-butyl-1,3,4- thiadiazole (ATBTD) increases with increase in concentration. The adsorption of thiadiazole derivatives on brass surface exposed to inhibitor-containing solutions was confirmed using SEM/EDX spectra and FT-IR spectra. Adsorption of these inhibitors on brass surface followed Langmuir adsorption isotherm. ICP-AES analysis confirms that dezincification was minimized to a greater extent in the presence of these inhibitors.

Effective ablation of dental hard tissues by means of the erbium:yttrium-aluminum garnet (Er: YAG) laser has been reported recently, and its application to caries removal and cavity preparation has been expected. However, few studies have investigated the morphological changes in hard dental tissues after Er: YAG laser caries treatment. In the present study the morphological changes in hard dental tissues after Er: YAG laser caries ablation in vitro was compared with that of conventional mechanical treatment. Thirty extracted human teeth with caries were used. Ten tooth was treated with the Er: YAG laser, and the other was treated with a conventional steel and diamond burs. Laser treatment was performed by means of a non-contact irradiation modes with cooling water spray, with a new Er: YAG laser (LiteTouch). Conventional bur treatment was conducted by means of a low-speed micromotor and air turbine with water cooling. Scanning electron microscope (SEM) observations were performed for each treatment. The Er: YAG laser ablated carious dentin effectively with minimal thermal damage to the surrounding intact dentin, and removed infected and softened carious dentin to the same degree as the burtreatment. In addition, a lower degree of vibration was noted with the Er: YAG laser treatment. The SEM examination revealed characteristic micro-irregularities of the lased dentin and enamel surfaces with potential benefits for adhesive restorations. Our results show that the Er: YAG laser is promising as a new technical modality for caries treatment
Tomov Georgi SEM evaluation of the morphological changes in hard dental tissues prepared by Er: YAG laser and rotary instruments // Saratov Journal of Medical Scientific Research, Vol. 6, Issue 3, 2010, pp. 667-671

Abstract. Two silver ion conducting solid electrolytes, Ag2HgI4 and Ag2CdI4, representing a wide class of AgI-based halogenide superionics have been the subjects of study by means of electrical impedance spectroscopy, SEM, porosity measurements and fractal dimension analysis. Even though both materials have been obtained by the same method under strictly identical conditions they were found to exhibit certain differences at the microstructural level. Thus, by the direct measurements of porosity and density it was found that the grain boundaries are better developed in silver mercuric iodide. On the assumption that pore geometry in the materials under study displays fractal character it was shown that the fractal dimension of the pore contours is larger in the case of Ag2HgI4. These results are in agreement with electrical studies which indicated that the grain boundary capacitance in Ag2CdI4 is two orders of magnitude smaller than that of the silver mercuric iodide.
J. Phys.: Condens. Matter 20 (2008) 474211 (5pp)