Adsorption: Concentration of liquid or gaseous molecules over the surface of a solid material is known as adsorption. It is a surface phenomenon. (e.g.) H2 adsorption over nickel. The solid material is known as adsorbent. (e.g.) Nickel‚ Silica gel‚ Charcoal‚ Zeolite The gaseous or liquid molecules are adsorbate (e.g.) H2 gas‚ Bromine‚ benzene‚ water vapour For gases‚ a special name is given as “occlusion’ 2.If the concentration is of bulk phenomenon‚ it is absorption. (e.g) Absorption
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SUPPLEMENTARY MATERIAL (#2000-0709) SOAP FROM NUTMEG: AN INTEGRATED INTRODUCTORY ORGANIC CHEMISTRY LABORATORY EXPERIMENT Marcio C.S. de Mattos and David E. Nicodem Departamento de Química Orgânica‚ Instituto de Química‚ Universidade Federal do Rio de Janeiro‚ Caixa Postal 68545 21945-970‚ Rio de Janeiro‚ Brazil 1) Written material used by students 2) Instructor notes 3) Chemical abstract registry number of chemicals 1) Written material used by students Soaps
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Chromatography • • • Separation based on polarity of compounds Two potential phases for a compound to exist in: mobile and stationary Partitioning of compounds between mobile phase and stationary phase occurs: o Compounds that are less polar move more in the mobile phase‚ those that are more polar “stick” more on the stationary phase o These polarity differences cause compounds move at different rates and therefore can be separated 1. Mobile Phase: the phase the moves; can be gas or
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2cm= 0.4423cm Unknown B (two separation circles) (1). 3.2cm/5.2cm=0.6153cm (2). 2.4cm/5.2cm=0.4615cm Results: Based on the Rf results Methylene chloride is a better solvent for this experiment than methanol and hexane. This is because silica gel is very polar and methylene chloride is slightly polar but it is mostly non-polar which allow the compound to
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The column fractions were collected in 25 ml test tubes. In that‚ fraction number 271-275th showed identical clear spot which were loaded on the activated silica gel TLC plates (20 cm × 20 cm). The plates were developed using methanol: ethyl acetate (60:40) solvent system. The single spot was located by exposing the plate to iodine fumes. Thus‚ it may indicate the presence of single
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analyses were carried out on a Perkin Elmer 2400 Elemental Analyser. The elemental and spectral analyses of synthesized compounds have been carried out at SAIF Punjab University‚ Chandigarh. The purity of compounds was checked on thin layers of silica gel in various non-aqueous solvent systems‚ e.g. benzene: ethylacetate (9:1)‚ benzene: ethylacetate (8:2). Molecular weight determinations were carried out by the Rast camphor method. Molar conductance measurements were made in anhydrous dimethylformamide
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DEVELOPMENT OF LOW COST EVAPORATIVE COOLER UNIT TO SUIT INDUSTRIAL ENVIRONMENT Project Advisor: Prof. R.A. Attalage G.P.T.K. Abeysekara‚ K.H.H.G. Ketanwila‚ K.A.P. Vithana E-mail: thanujakasun@gmail.com‚ketanwila@gmail.com‚koswatta@gmail.com Department of Mechanical Engineering‚ University of Moratuwa‚ Moratuwa‚ Sri Lanka Abstract The purpose of this paper is to demonstrate the adaptability of evaporative cooling technology to Sri Lankan environment. Desiccant cooling technology
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Analysis of A. fischeri chDNA restriction digestion by Sal I enzyme after isolation and purification via agarose gel electrophoresis Bio 219-064 (Techniques in Molecular Biology) Group 5: Tung Nguyen‚ Uyen Tran‚ Amber Beckley‚ Danielle Exler Department of Biology‚ Drexel University‚ Philadelphia‚ Pennsylvania 19104 Submitted October 27‚ 2014 ________________________________________________________________________ Abstract Bioluminescence is one of the benefits that a deep sea organism received
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Chromatographic method has been developed and validated for the simultaneous estimation of of ellagic acid‚ chlorogenic acid‚ gallic acid and quercetin in the leaf extract of Terminalia tomentosa and its Formulation. The stationary phase used was precoated silica gel 60F254.The mobile phase used was a mixture of Butyl acetate: Formic Acid: Distilled Water 14:5:5 (v/v). The detection of spots were carried out at 254 nm. This HPTLC method was validated statistically and recovery study was performed to confirm
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components of the vapor-compression refrigeration cycle (compressor‚ evaporator‚ condenser‚ and some form of metering device). These machines can implement a variety of refrigerants. Adsorption chillers use municipal water as the refrigerant and benign silica gel as the desiccant. Absorption chillers utilize water as the refrigerant and rely on the strong affinity between the water and a lithium bromide solution to achieve a refrigeration effect. Most often‚ pure water is chilled‚ but this water may also
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