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Hap has been developed from eggshell by UV-irradiation for the first time. The negligible cytotoxicity and the efficient delivery of a therapeutic level of ciprofloxacin as well as bioactivity of this UV- Hap supports its use in biomedical fields.

Using scanning electrochemical microscopy (SECM) we have measured quantitatively the depletion of O2 during the photodegradation of 4-chlorophenol at supported TiO2 films for the first time and established the connection between Cl-formation and O2 depletion rates.

The channel flow method with electrochemical detection (CFMED) has been used to investigate the photoelectrochemical reduction of O2 at UV-illuminated TiO2 surfaces in both aerated and oxygenated solutions. This approach detects O2 amperometrically at a working detector electrode strategically positioned downstream of a TiO2 surface, comprising a thin film of particulate material (Degussa P-25). By monitoring the transport-limited current as a function of flow rate with and without illumination, it has been possible to analyze the reaction kinetics in terms of various models proposed in the literature. The kinetics of the reduction process are reported, and the implications for semiconductor photocatalysis are discussed.

A well-known biomaterial, hydroxyapatite (HAp), was synthesized by employing a wet chemical precipitation method utilizing orthophosphoric acid and calcium hydroxide.

Key words: Ceramic tile; water absorption; bulk density; firing shrinkage; modulus of ruptureDOI: http://dx.doi.org/10.3329/bjsr.v24i2.10775 Bangladesh J. Sci. Res. 24(2):169-180, 2011 (December)

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