A metal matrix composite prepared from electrospun TiO2 nanofibers and an Al 1100 alloy via friction stir processing.

Electrospun TiO2 nanofibers, consisting of anatase phase TiO2 single-crystalline crystallites with sizes of approximately 10 nm, were impregnated into an Al 1100 alloy by the technique of friction stir processing (FSP). The studies of the resulting TiO2-Al composite revealed that the electrospun TiO2 nanofibers with diameters of approximately 200 nm were broken into nanoparticles during FSP; the in situ generated pristine surfaces led to the interfacial reaction between TiO2 and Al and resulted in the formation of strong interfaces between the electrospun TiO2 nanoparticles and the Al 1100 matrix. This was evidenced by the fact that the filler-matrix fracture always occurred on the Al matrix side in the interfacial region.

Migration of levonorgestrel IUS in a patient with complex medical problems: what should be done?

Patients with complex medical problems should be counselled about the need for highly effective contraception. As failure resulting in pregnancy, could cause significant morbidity and mortality. The LNG-IUS has gained great popularity and generally has a low side effect profile; however, perforation of the uterus and migration of the device is a potentially serious complication known to be associated with its use.

Preparation and characterization of electrospun SiO2 nanofibers.

The objective of this study was to prepare and characterize electrospun SiO2 nanofibers for composite (particularly dental composite) applications. We investigated (1) tetraethyl orthosilicate (TEOS) as the alkoxide precursor, (2) polyethylene oxide (PEO) and polyvinyl pyrrolidone (PVP) as the carrying polymers, (3) several solvents for making the spin dopes, and (4) the morphological and structural properties of the electrospun SiO2 nanofibers and their relationship with the pyrolysis temperatures. We also investigated the morphology durability of the prepared SiO2 nanofibers by subjecting them to vigorous ultrasonic vibrations.