INTRODUCTION: EXCESS MOLAR ENTHALPIES (HEM) OF NON-ELECTROLYTE LIQUID SOLUTION ARE OF CONSIDERABLE IMPORTANCE FOR MIXING OR SEPARATION PROCESSES IN THE CHEMICAL ENGINEERING AND PETROLEUM INDUSTRIES. …

INTRODUCTION: THE PREDICTION OF THE THERMODYNAMIC PROPERTIES OF TERNARY, QUATERNARY AND HIGHER ORDER SYSTEMS IS IMPORTANT IN CALCULATING PHASE DIAGRAMS. THE THERMOPHYSICAL PROPERTIES ARE IMPORTANT TO QUANTIFY THE DEVIATION FROM IDEALITY OF THE THERMODYNAMIC FUNCTIONS OF MIXTURES, WHICH RESULT ESSENTIALLY FROM MOLECULAR INTERACTIONS. FOR INDUSTRIAL APPLICATIONS, IT IS OF GREAT IMPORTANCE TO HAVE ACCESS TO RELIABLE PHYSICOCHEMICAL PROPERTIES OF MULTI-COMPONENT SYSTEMS [1, 2]...

RECENTLY, MANY RESEARCHES HAVE BEEN DONE ON THE THERMO-PHYSICAL PROPERTIES OF NANO FLUIDS [1-3]. ACCORDING TO THE CONCEPT OF MIXING THEORY FOR IDEAL MIXTURES, ADDING NANOPARTICLES TO THE BULK FLUID INCREASES ITS DENSITY [2]. BY COMPARING THE CALCULATED RESULTS OF DENSITY USING MIXING THEORY WITH THE EXPERIMENTAL DATA, THE DEVIATION OF DENSITY WAS OBSERVED. IN THIS WORK, WE SHOWED THAT THIS DEVIATION IS DUE TO FORMATION OF NANO LAYER AROUND CENTRAL NANOPARTICLE. FROM STATISTICAL MECHANICS WE KNOW THAT FLUID MOLECULES AROUND NANOPARTICLE HAS AN OSCILLATORY STRUCTURE, THAT CAN BE OBTAINED USING DENSITY FUNCTIONAL THEORY (DFT) [1]. WE CALCULATED THE TOTAL EXCESS ADSORPTION FOR DIFFERENT NANO FLUIDS USING THE DFT AND FOUND THAT THE DENSITY ENHANCEMENT IN NANO FLUIDS HAS A LINEAR CORRELATION WITH THE TOTAL EXCESS ADSORPTION. THE TOTAL EXCESS ADSORPTION IS EQUAL TO THE NUMBER OF NANOPARTICLES MULTIPLY TO THE EXCESS ADSORPTION ABOUT EACH NANOPARTICLE. OUR RESULTS DEMONSTRATED THAT THE VARIATION OF DENSITY ENHANCEMENT VERSUS TOTAL EXCESS ADSORPTION FOR AL2O3-WATER NANO FLUID HAS LINEAR CORRELATION WITH R2=0.999.ELUCIDATING THE INTERACTIONS OCCURRING IN NANO FLUIDS, WE DECIDED TO DETERMINE THE PARTIAL MOLAR VOLUME USING THE EXPERIMENTAL DENSITY RESULTS FOR DIFFERENT NANO FLUIDS. OUR RESULTS SHOW THAT THE PARTIAL MOLAR VOLUME OF FLUIDS IN NANO FLUIDS HAS A LINEAR CORRELATION WITH VOLUME CONCENTRATION OF NANO PARTICLS. ALSOA LINEAR CORRELATION BETWEEN THE EXCESS PARTIAL MOLAR VOLUME AND THE WATER MOLECULES ADSORPTION ON NANOPARTICLES SURFACES HAD BEEN FOUND. FOR AL2O3-WATER NANO FLUID, THE REGRESSION COEFFICIENT OBTAINED IS 0.999.

INTRODUCTION: THE EXCESS MOLAR VOLUMES AND REFRACTIVE INDICES ARE OF GREAT INTEREST FOR THE ADEQUATE DESIGN OF INDUSTRIAL PROCESSES AND FOR THEORETICAL PURPOSES. IN THIS PROJECT, DENSITY AND REFRACTIVE INDEX FOR TERNARY SYSTEMS OF (2-PROPANOL+BUTYLAMINE+ISOBUTYLMETHYLKETONE) AT T=298.15 K HAVE BEEN MEASURED OVER A WHOLE RANGE OF MOLE FRACTIONS AND WERE USED TO CALCULATE THE EXCESS MOLAR VOLUME AND THE DEVIATIONS OF REFRACTIVE INDEX...

INTRODUCTION IN THIS PAPER EXPERIMENTAL DENSITIES, VISCOSITIES AND DERIVED PROPERTIES OF TERNARY MIXTURES CONSIST OF (DIETHYLKETONE+2-BUTANOL+ETHYLCHLOROACETAT) AT TEMPERATURE 298.15 K WERE PRESENTED. THE EXCESS MOLAR VOLUMES AND OTHER THERMOCHEMICAL PROPERTIES AS VISCOSITY DEVIATION ARE OF GREAT INTEREST FOR THE ADEQUATE DESIGN OF INDUSTRIAL PROCESSES AND FOR THE ORETICAL PURPOSES.THE INTERACTION BETWEEN SOLVENTS WITH POLAR GROUPS AND CARBONYL CARBON GROUP OF KETONE PLAYS A CRUCIAL ROLE IN THE STRUCTURAL EFFECTS, MOLECOLAR LEVEL AND FOR PRACTICAL APPLICATIONS.

A RESEARCH IS IN PROGRESS IN OUR LABORATORY WHICH AIMS AT THE DETERMINATION OF THE MAIN EXCESS THERMODYNAMIC PROPERTIES FOR A SERIES OF LIQUID MIXTURES WHICH MAY BE REALIZED WITH THE FOLLOWING COMPOUNDS: AMINES, ALCOHOLS, ESTERS, AMIDES AND ALKANE. THESE COMPOUNDS WERE SELECTED IN VIEW OF THEIR DIFFERENT POLARITY AND PROTICITY, IN ORDER TO REALIZE MULTI-COMPONENT ASYMMETRIC MIXTURES CHARACTERIZED BY DIFFERENT TYPES OF INTERACTIONS [1, 2]. IN THIS PAPER DENSITIES OF THE QUATERNARY MIXTURE CONSISTING OF {1-CHLOROBUTANE (1) +2-CHLOROBUTANE (2) +BUTYLAMINE (3) +BUTYLACETATE (4)} WERE MEASURED OVER THE WHOLE RANGE OF COMPOSITION AT 298.15 K AND AMBIENT PRESSURE. A NUMBER OF GEOMETRICAL AND EMPIRICAL EQUATIONS WERE ALSO USED TO VERIFY THEIR ABILITY TO PREDICT TERNARY AND QUATERNARY PROPERTIES FROM THEIR LOWER ORDER MIXTURES. THE EXPERIMENTAL DATA WERE USED TO EVALUATE THE NATURE AND TYPE OF INTERMOLECULAR INTERACTIONS IN MULTI-COMPONENT MIXTURES.

THIS WORK REPORTS DENSITY DATA FOR BINARY SYSTEM OF POLYETHYLENE GLYCOL 200 (PEG) AND NMETHYL- 2-PYRROLIDONE (NMP) OVER THE WHOLE CONCENTRATION RANGE, AT 288.15, 293.15, 298.15, 303.15, AND 308.15 K AS A FUNCTION OF COMPOSITION AT ATMOSPHERIC PRESSURE. FROM THE EXPERIMENTAL DENSITY DATA, THE EXCESS MOLAR VOLUMES WERE CALCULATED, AND THE RESULTS WERE FITTED TO A REDLICH– KISTER EQUATION TO OBTAIN THE COEFFICIENTS AND ESTIMATE THE STANDARD DEVIATIONS BETWEEN THE EXPERIMENTAL AND CALCULATED QUANTITIES. IN ADDITION, BASED ON FTIR SPECTRA FOR THE BINARY SYSTEM OF PEG AND NMP, THE INTERMOLECULAR INTERACTIONS OF PEG AND NMP WERE DISCUSSED. ... 

INTRODUCTION: DENSITIES AND REFRACTIVE INDEX OF TERNARY SYSTEM (3-CHLORO-2-METHYL-1-PROPENE+AMYL ALCOHOL+ETHYLENE GLYCOL MONO METHYL ETHER) WERE MEASURED AT TEMPERATURE OF 298.15 K...

INTRODUCTION: EXCESS PROPERTIES OF MIXTURES PROVIDE INFORMATION ABOUT THE MOLECULAR INTERACTIONS BETWEEN THE VARIOUS COMPONENTS AND CAN BE USED FOR THE DEVELOPMENT OF MOLECULAR MODELS DESCRIBING THE THERMODYNAMIC BEHAVIOR OF MIXTURES [1– 2]. THE THERMODYNAMIC PROPERTIES OF MIXTURES ARE OF GREAT INDUSTRIAL INTEREST. THE PROPERTY STUDIED HAS PROVED TO BE MEANINGFUL FROM A THERMODYNAMIC POINT OF VIEW, AS IT PROVIDES DIRECT INFORMATION ABOUT THE ENERGETIC EFFECTS ARISING BETWEEN THE MOLECULES PRESENT IN THE MIXTURE, SO IT CAN HELP TO EXPLAIN THE REARRANGING OF THE BONDING THAT OCCURS DURING THE MIXING PROCESS, WHICH IS ESSENTIAL WHEN STUDYING NEW THEORETICAL APPROACHES TO THE LIQUID STATE, EITHER PURE OR MIXTURE.