Fabrication and characterization of Al/PMMA/Cr metal-insulator-metal diode (original) (raw)

Construction and application of UNS S31254 stainless steel as indicator electrode in conductimetric tritations

Química Nova

UNS S31254 SS electrodes have been built to substitute platinum in conductimetric titrations. The electrodes were tested in both acid-basic titration (chloridric acid and sodium hydroxide) and precipitation titration (sodium chloride and argentum nitrate as titrant). The practical application was exemplified from conductimetric tritations of HF ¾ HNO3 mixtures used in metalurgical industry to passivate stainless steels. The results were compared with those obtained using commercial platinum electrodes. The equivalent volumes obtained were comparable within 3% experimental error. Its application depends on the nature of electrolyte. These results have shown that stainless steel, less expensive than platinum (about three order of magnitude), can substitute platinum electrodes in routine analyses and didactic laboratories.

Hdpe/Methylsilane Modified Diatomite Composites: Analysis of Thermal and Mechanical Properties

Periódico Tchê Química

According to IUPAC, the composites are multicomponent materials comprising multiple, different (nongaseous) phase domains in which at least one type of phase domain is a continuous phase.High density polyethylene (HDPE) reinforced with silica particles is an example of a composite material. Diatomite is a natural silica commonly used in filter media.In the present work, the diatomite was organofunctionalized with methyltriethoxysilane (C1) and then used in the preparation of HDPE/diatomite composites with diatomite content of 2.0 and 5.0 wt%. The composites were evaluated in terms of mechanical properties by dynamicmechanical analysis (DMTA), Izod impact test and flexural strength and tensile strength tests.TheFourier transform infrared spectrum (FTIR) of the organofunctionalized diatomite presented bands characteristic of methyl groups, proving the efficiency of the surface modification.The addition of 5.0% diatomite in HDPE resulted in an increase of 8.0 °C in thermal stability, c...