Absorption Spectrum of Conjugated Dyes Bashar Baraz Lab Partners: whole class Physical Chemistry II 3/22/2015 Abstract: The highly conjugated system of the cyanine dyes makes it a very good compound in the development of more efficient solar cells. In this experiment, the maximum wavelength was measured for nine dyes using a UV-Vis spectrum. The result that were obtained agreed with Kuhn’s model for the less polarizable end groups such as 3,3 '-diethyloxadicarbocyanine and 3,3 '-diethyloxatricarbocyanine
(bleaching, use of UV Absorbers, and coloration) additionally impacts the UVR protection capacity of materials and some restoration exercises like wetness, extend, high temperature, or chemical treatment. It has been discovered that filaments containing conjugated fragrant framework like PET are more compelling for UVR retention. The cellulosic strands having no double bond in their molecular backbone have low
Catalysis is one of the most important phenomena both in nature and chemistry. Photochemistry, which means chemical changes induced by absorption of light, constitutes the basis of human life. Plasmonic nanoparticles are characterized by their well-known surface catalytic properties and strong light-matter interactions.[2] Plasmonic nanoparticles are potentially useful in a number of critical technologies, including solar-to-chemical[1][3][4] and solar-to-electrical energy conversion[5], molecular
Results & Discussions: Characterization of photo-catalysts: Raman Spectroscopy: Figure (2) shows the Raman spectrum of prepared activated carbon (AC). The sample shows the characteristic D and G carbon peaks at 1380 cm−1 and 1585 cm−1, respectively. In simple terms, for carbon materials, the D peak intensity correlates with defects in the carbon lattice and is linked to the extent of sp3 hybridization while the G peak arises from the graphitic network and extent of sp2 hybridization. ID/IG = 0
INTRODUCTION Drug delivery Systems Drug delivery systems (DDS) have been developed in order to control pharmacological parameters such as bioavailability, biodistribution and pharmacokinetics of the administered substances. Bioavailability is defined as the percentage of an administered dose of therapeutic agent that becomes available in the systemic circulation in its active form. Drug delivery systems can enhance bioavailability by increasing in-vivohalf-lives of fragile pharmaceuticals e.g. protection
sample of Rhodamine β-Lactone. The absorbance of the sample was then measured over a range of temperatures from which the equilibrium constant (K), enthalpy (ΔH), entropy (ΔS) and Gibbs free energy were then calculated. INTRODUCTION: The xanthene dye Rhodamine β-Lactone can undergo multiple equilibria. “In protic solutions, Rhodamine β-Lactone exists as an equilibrium mixture of a colourless lactone and a coloured zwitterions.” [1] as shown in appendix 1. The position of the equilibrium