in this research the composition of polyurethane closed cell (pucc) with two different concentrations of sio2 nanoparticles (1.0 and 2.0 wt%) have been prepared. optical microscopy and sem imaging, watering uptake, ftir and raman spectroscopy of the synthesized samples were carried out. the optical microscopy imaging of samples showed differences in the appearance of matrix produced by applying...

The application of a multi-frequency laser source for the use in matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOFMS) is described. An elliptically polarized beam of a Nd:YAG laser emitting at 355 nm (200 mJ) is focused into a Raman shifter, filled with high pressure hydrogen. As a result, numerous Raman lasers (including vibrational and rotational Raman em...

Using label-free ToF-SIMS imaging mass spectrometry, we generated a map of small molecules differentially expressed in the Drosophila wing imaginal disc. The distributions of these moieties were in line with gene expression patterns observed during wing imaginal disc development. Combining ToF-SIMS imaging and coherent anti-Stokes Raman spectroscopy (CARS) microspectroscopy allowed us to locall...

Plasmonic biosensors based on the localized surface plasmon resonance (LSPR) of metal nanoparticles have been developed using both nanoparticle arrays and single nanoparticles. We introduce LSPR biosensing by describing the initial experiments performed using both model systems and disease biomarkers. LSPR shift-enhancement methods, exploitation of the short electromagnetic field decay length, ...

The crystallization of hydrogenated amorphous silicon layers (a-Si:H) [1,2] deposited by plasma enhanced chemical vapor deposition (PECVD) is of great interest. Generally, laser or metals are used to induce crystallization in aSi:H films. We have found that films deposited at high rf power (> 0.2 W/cm2) by PECVD technique shows some crystallites embedded in a-Si:H matrix and their after its vac...

Conventional white light endoscopy remains the current standard in routine clinical practice for early detection of gastric cancer. However, it may not accurately diagnose preneoplastic gastric lesions. The technological advancements in the field of endoscopic imaging for gastric lesions are fast growing. This article reviews currently available advanced endoscopic imaging modalities, in partic...

The cluster Ag₄₄SePh₃₀, originally prepared from silver selenolate, upon oxidative decomposition by H₂O₂ gives the same cluster back, in an apparently reversible synthesis. Such an unusual phenomenon was not seen for the corresponding thiolate analogues. From several characterization studies such as mass spectrometry, Raman spectroscopy, etc., it has been confirmed that the degraded and as-synt...

Using confocal Raman and fluorescence spectroscopic imaging in 3-dimensions, we show direct evidence of inhomogeneous Nd(3+) distribution across grain boundaries (GBs) in Nd(3+):YAG laser ceramics. It is clearly shown that Nd(3+) segregation takes place at GBs leading to self-fluorescence quenching which affects a volume fraction as high as 20%. In addition, we show a clear trend of increasing ...

key words: wall paintings, rocky hewn churches, Cappadocia (Turkey), pigments, Raman spectroscopy, Fourier transform infrared spectrometry This paper presents the results of the analysis on the rock hewn wall paintings of eleven churches in Cappadocia, Turkey. A large group of churches in the region of Nevşehir were analysed in order to increase the database of materials and techniques of medie...

Heavy metal and metalloid poisoning in the environment food has piqued public’s interest since it poses significant hazards to ecological system human health. In food, several metals, including cadmium (Cd), lead (Pb), mercury (Hg), tin (Sn), manganese (Mn), aluminium (Al), metalloids, arsenic (As), antimony (Sb), selenium (Se), pose a severe threat It is of utmost importance detect even minute...