Abstract: This paper presents a highly sensitive fiber-optic oxygen sensor. The sensor was fabricated using palladium (II) meso-tetrakis (pentafluorophenyl) porphyrin (PdTFPP) and porous silica nanoparticles embedded in a tetraethylorthosilane (TEOS)/n-octyl-triethoxysilane (Octyl-triEOS) composite xerogel present as a coating on the end of the fiber. Sensitivity is quantified in terms of the r...

Partial carbonized nanoporous resin (PCNR-150), based on organic xerogel compounds, was prepared at 150 oC by sol–gel method from pyrogallol and formaldehyde mixtures in water using perchloric acid as catalyst. The PCNR-150 was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transformed infrared spectroscopy (FTIR) and nitrogen porosim...

treatment with these acids may cause disorder to the stiff fibril structure of native chitin with a slight cleavage of glycosidic linkages, and afford enzymatically digestible colloidal chitins. The enzymic digestibility varies mainly with these acids used for its preparation. Wenow wish to report an improved method for the preparation ofcolloidal chitin by treatment with aqueous methanesulfoni...