Absorption spectroscopy

Absorption Spectroscopy Author: Cesar M. Lemas Lab Partners: Jahnnan Jayesh Patel, Myong Ho Lee & Salem Alsaif Instructor: Jordan Andrew Mudery Chem 151, Section 7D Date Work Performed: October 18th 2012 Date Report submitted: October 25th 2012 Abstract Absorption spectroscopy is a practical way to find what the light absorption of a substance is, and whit this data combining the Beer’s law equation you can determine the concentration of different things in a solution, in

Atomic absorption spectroscopy (AAS) defined as spectroanalytical method for the quantitative pledge of chemical elements utilizing the absorption of optical radiation by free atoms in the gaseous state. In short, AAS is measurement and interpretation of absorbed radiation in atomic level. 70 different elements in solution or solid samples practically used in pharmacology, biophysics and toxicology research can be found by ASS. [1] Atomic absorption spectroscopy was initiate as an analytical technique

were used gamma irradiation to synthesis the Ag nanoparticles in PVA [15,16], and the other literature were prepared Ag-PVA nanocomposite films and then irradiated with gamma at doses (25, 50, 75, 100 KGy) [17,]. According to this literature the absorption peak intensity at 427 nm for silver nanoparticles is increased with increasing the gamma doses, until the higher doses 100 KGy, its decrease and the reason for this behaviour at higher doses the polyvinyl alcohol will suffer degradation. But in

2-1. Syntheses of the cysteamine-capped ZnS:Mn nanocrystals All the solvents, except deionized (DI) water, were purchased from Sigma-Aldrich (reagent grade) and distilled prior to use. All the reactants, including cysteamine (HSCH2CH2NH2), ZnSO4, MnSO4, and Na2S, were purchased from Sigma-Aldrich and used as received. A solution of quinine sulfate in H2SO4 (0.1 M) was purchased from Fluka to evaluate the relative quantum efficiencies of the products. ZnS:Mn-Cyst nanocrystals were synthesized following

(0.1, 3, 5, 7, 9 h) were prepared by chemical reduction methods. Surface topology, optical and electrical properties of PVA-Ag nanocomposite were studied using absorption spectroscopy, electrometer, atomic force microscope (AFM) and photoluminescence (PL) spectroscopy were used to characterize the prepared nanocomposites. Optical absorption coefficient studies showed a peak at 427 nm for all samples, in addition to the peak at 200 nm for undoped PVA film. There is observable change in the absorbed

(0.1, 3, 5, 7, 9 h) were prepared by chemical reduction methods. Surface topology, optical and electrical properties of PVA-Ag nanocomposite were studied using absorption spectroscopy, electrometer, atomic force microscope (AFM) and photoluminescence (PL) spectroscopy were used to characterize the prepared nanocomposites. Optical absorption coefficient studies showed a peak at 427 nm for all samples, in addition to the peak at 200 nm for undoped PVA film. There is observable change in the absorbed

reflectance data was convert absorption mode [27]. As shown in figure 7 the as-prepared CuO nanostructures with different ratio of citric acid exhibit different sensitivities to visible light, the absorption edge is shifted to shorter wavelength with compact size and altered morphology. Our results point out not only the size but also the morphology of the CuO nanocrystals affects the bandgap. It is quite observable from the figure 7b that SP0.10A exhibits the hogher absorption properties in the visible

are analysed by FTIR, XRD, SEM-EDX, UV-Visible and incubation studied. 3.1 Fourier Transform Infrared Spectroscopy The FTIR spectrum of CoCaOxM crystals were as shown in Fig 3. In FTIR spectrum, a strong band at 3434cm-1 and 3062cm-1 is due to asymmetric and symmetric OH stretching while an intense absorptions band at 3261cm-1 show inters molecular hydrogen bonded OH stretch. Intense absorption band at 1612cm-1 and 1318cm-1 can be assigned to asymmetric and symmetric C=O stretching bands specific

Water samples were stored in a cooler and brought 143 back to the laboratory on the same day. The samples were immediately filtered using pre-rinsed 0.2 μm Remote Sens. 2015, 7 5 Nuclepore membrane filters (Whatman GmbH) and analyzed for optical 144 absorption. Meteorological 145 data (wind speed and wind direction) were acquired from NOAA 's National Data Buoy Center 146 (NDBC) at the Grand Isle station (GISL1, 20.265°N 89.958°W) for 2010 and 2011. River discharge 147 information was obtained

ultrasonic process, whereas the broad band in the region of 1100 – 1000 cm-1 maintained its intensity even after ultrasonic process. This region is often related to the Si-O-Si asymmetric stretching in bioactive glasses, and may be overlapping C-O-C absorption region of the PU. P-O stretching in bioactive glasses is often assigned to