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The interaction, at a low temperature, between molecular hydrogen and the zeolite Li–FER was studied by means of variable temperature infrared spectroscopy and theoretical calculations using a periodic DFT model. The adsorbed dihydrogen molecule becomes infrared active, giving a characteristic IR absorption band (H–H stretching) at 4090cm–1. Three different Li+ site types with respect to H2 adsorption were found in the zeolite, two of which adsorb H2. Calculations showed a similar interaction energy for these two sites, which was found to agree with the experimentally determined value of standard adsorption enthalpy of H0=–4.1(±0.8)kJ.mol–1. The results are discussed in the broader context of previously reported data for H2 adsorption on Na–FER and K–FER.

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To evaluate the FTIR of Hydroxyapatite additives 2 %, and 5 % of dry (HAP) prepared fromegg shells to the polymer. Materials and Methods: Thirty six specimens of heat cured acrylic resinand other specimens of heat cured acrylic resin with 2 % and or 5 % prepared then immersed in distilledwater for 48 hours then dried for 24 hours then scratched with sharp knife and measured by FTIRspectra. Results: The result showed when adding 2% &/or 5% hydroxy apatite to heat cured acrylicresin denture base material resulting a homogenous mixture, without chemical reaction in between andwithout changes of acrylic resin properties. Conclusion: they can be used together in patients withbone hydroxy apatite deficiency

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New azo dye was synthesized by reaction dizonium salt of sulfanilic acid with antimelaria drug (chloro quin diphosphate).This product was characterized by FTIR(Fourier Transform Infrared)andUV.Visible spectrophotometer .The antibacterial activities of the compound was studied and evaluated using gram positive and negative gram stain. The purity of the dye was checked by thin layer chromatography(TLC) using solvent system( sec.Butanol-water-acetic acid)(2:2:1).The melting point of the purified dye was measured in an open capillary tube. We have been concluded that the prepared azo dye showed antibacterial activity against this micro organism.

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The present study included the extraction and characterization of EPS production by a local soil isolate Bacillus subtilis and examine the effect of different factors pH, inoculums size, incubation periods, and carbon, nitrogen and phosphate sources on EPS production. The exopolysaccharide was recovered from the culture supernatant by using a cold ethanol precipitation. The total carbohydrate content was determined by phenol sulfuric acid method at 488 nm, and major structural groups were detected by Fourier transform infrared (FTIR) spectroscopy at frequency range of 400 to 4000 cm-1. Basal salt solution (BSS) showed higher efficacy in supporting the bacteria to produce EPS (0.986 mg/ml) as dry weight. The study showed that glucose and fructose were gave maximum EPS production as a carbon source along with ammonium chloride as a nitrogen source. The optimal medium conditions were pH 7.0, inoculum size 5-6%, after four days of incubation to promote the maximum EPS production for the bacteria under study

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This study was aimed to extract exopolysaccharide (EPS) produced by Listeria monocytogenes and investigate the maximum production by using different culture media and various factors. The EPS was obtained from the culture supernatant by cold ethanol precipitation and yield maximum production (0.368mg /ml ) in basal salt solution (BSS) as dry weight. The total carbohydrate content was determined by phenol sulfuric acid method. The functional groups were detected by Fourier transform infrared (FTIR) spectroscopy at frequency range of 400- 4000cm-1. Different alcohols were checked for their efficiency on precipitating EPS, those other than ethanol, methanol and isopropanol were able to sediment the EPS, while isoamylalcohol show no effect on precipitation.The results also indicated that the medium volume play an important role in EPS production.

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Abstract: The electronic spectra within UV¬¬-Vis region for benzene (C6H6) and Carbone tetrachloride (CCl4) molecules have been studied. Since Benzene molecule belongs to D6h point group, with very high symmetry elements, therefore it may be expected for its internal vibrations to be either infrared or Raman active only. The spectral properties of (CCl4) are also have been studied. This (CCl4) belongs to Td point group, where its fundamental internal vibrations will be also, infrared or Raman actives. These aspects will be considered and discussed in this work.

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Changes in the crystalline domains caused by heat treating Mylar filmsbetween Tg to 240 oC have been studied by Fourier Transform Infraredspectroscopy (FTIR) and X-ray Diffraction (XRD). Prior to glass transition temperature, shrinkage in the film is insignificant, but progresses rather abruptly as melting point is approached bringing the smooth film surface to rather wrinkle.The absorbance increase in the FTIR spectra is due to the thickened film caused by shrinking rather than the improvement in the crystalline orientation. XRD on the other hand show that heat treatment of the film near melting point only reduces the contribution of the crystalline domains in the direction [100] in favor of other direction namely rather than on the account of loosing order in favor of the amorphous regions.

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The aim of this work was to use a spectrophotometric method for thedetermination of paracetamol in pharmaceutical formulations.The quantification of paracetamol through infrared spectroscopy was developed and validated for pharmaceuticals in tablet forms. The method involves the extraction of the active ingredient with chloroform and the measurement of the area of the infrared band corresponding to the carbonyl group centered at 1650cm-1. The specificity,linearity,detection limits,precision and accuracy of the calibration curve, paracetamol extraction, infrared analysis and data manipulation were determined in order to validate the method. The statistical results were compared with the quantification of paracetamol through UVdetection.The recovery values obtained in the analysis of pharmaceuticals are within the range 98-105%.

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In this paper, the nanocrystalline porous silicon (PS) films is prepared by electrochemical etching of p-type silicon wafer with different currents density (15 and 30 mA/cm2) and etching times on the formation nano-sized pore array with a dimension of around few hundreds nanometric. The films were characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties.We have estimated crystallites size from X-Ray diffraction about nanoscale for porous silicon and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on surface chemical composition of PS. The etching possesses inhomogeneous microstructures that contain a-Si clusters (Si3–Si–H) dispersed in amorphous silica matrix and (O-SiO,C-SiO). From the FTIR analyses showed that the Si dangling bonds of the as-prepared PS layer have large amount of Hydrogen to form weak Si–H bonds. The atomic force microscopy investigation shows the rough silicon surface, with increasing etching process (current density and etching time) porous structure nucleates which leads to an increase in the depth and width (diameter) of surface pits. Consequently, the surface roughness also increases.

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Low pressure nitrogen plasma has been used to modify surface properties of polycarbonate membrane. Evaluation of surface morphology changes has been carried out using atomic force microscopy (AFM). To study surface topography changes related to etching effect, the scanning electron microscopy (SEM) has been carried out. The results show a considerable improvement in surface roughness, SEM and AFM analyses show remarkable changes in surface topography as a consequence of the plasma-etching mechanism. The increasing of optical transparency of the plasma treated membranes was observed from UV-visible spectroscopy. The refractive index value for treated films has been decreased as observed from laser ellipsometry measurement. Furthermore, the changes in chemical bonds for polymer films were studied. It is found that plasma treatment can change chemical structure of polymer surfaces partially.

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