TITLE

Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C[sub 4] and C[sub 5] )/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

AUTHOR(S)
Moulik, S P; Aylward, Wanda M; Palepu, R
PUB. DATE
January 2001
SOURCE
Canadian Journal of Chemistry;Jan2001, Vol. 79 Issue 1, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The microemulsion forming systems of water/cetylpyridinium chloride/butan-1-ol/n-hexane, and water/cetylpyridinium chloride/pentan-1-ol/n-hexane have been studied with respect to their phase behaviours and percolation of conductance to derive information on their droplet physicochemical characteristics (dimension, interfacial area and composition, and number density). This was carried out at different water contents at specific ratios of surfactant and cosurfactant and at various temperatures. From the information collected, the energetics of the transfer of the alkanol (butan-1-ol and pentan-1-ol) from the continuous oil-phase to the interfacial region (the interphase) have been estimated. At the conductance percolation threshold, the droplets cluster or associate, can be considered to form a pseudophase similar to surfactants forming micelles. Based on this concept, the energetics of the clustering process have been evaluated, and the results are discussed in comparison with other recently studied systems.Key words: energetics of clustering, percolation, phase diagrams, microemulsions and thermodynamics of transfer.Afin de pouvoir d�duire des informations sur les caract�ristiques physicochimiques de leurs gouttelettes (dimension, surface et composition interfaciales et nombre de densit�), on a d�termin� les comportements des phases et la percolation de la conductance des syst�mes eau/chlorure de c�tylpyridinium/butan-1-ol/hexane et eau/chlorure de c�tylpyridinium/pentan-1-ol/hexane qui forment des micro�mulsions. Cette �tude a �t� effectu�e � diverses teneurs en eau, � des rapports sp�cifiques d'agent de surface et de cosurfactant et � diverses temp�ratures. � partir des informations recueillies, on a �valu� les �nergies de transfert des alcools (butan-1-ol et pentan-1-ol) de la phase huileuse continue � la r�gion interfaciale (interphase). Au seuil de percolation de la conductance, on peut consid�rer que les agr�gats de gouttelettes forment une pseudophase semblable � celles des agents de surface qui forment des micelles. En se basant sur ce concept, on a �valu� les �nergies associ�es au processus de formation d'agr�gats et on discute des r�sultats par comparaison avec d'autres syst�mes �tudi�s r�cemment.Mots cl�s : �nergies impliqu�es dans la formation d'agr�gats, percolation, diagrammes de phase, micro�mulsions et thermodynamique de transfert.[Traduit par la R�daction]
ACCESSION #
10579773

 

Related Articles

  • Thermodynamics of triaryltin chloride adduct complexes. Asadi, Mozaffar; Jamshid, Khosrow Aein // Canadian Journal of Chemistry;Jan2001, Vol. 79 Issue 1, p70 

    The stability constants and the thermodynamic data were measured spectrophotometerically for 1:1 adduct formation of triaryltin chlorides, where aryl groups are p-chlorophenyl, phenyl, p-, m-, and o-tolyl, as Lewis acids, with chloride and bromide ions, as Lewis bases, in 50 v/v ethanol-water...

  • Self-Association of Trifluoromethanesulfonamide in Inert Solvents. Chipanina, N. N.; Sherstyannikova, L. V.; Sterkhova, I. V.; Aksamentova, T. N.; Turchaninov, V. K.; Shainyan, B. A. // Russian Journal of General Chemistry;Jun2005, Vol. 75 Issue 6, p876 

    Trifluoromethanesulfonamide exists in inert solvents as an equilibrium mixture of the monomer and self-associates of the structure depending on the solvent polarity. In low-polarity CCl4 and C2Cl4, a cyclic tetramer is formed, in which the NH2 group is involved in two NH?O=S hydrogen bonds; in...

  • Investigations on the thermal decomposition of 1,2-dioxetanes via DSC. Flammersheim, H.-J.; Wei�, D.; Opfermann, J. R. // Journal of Thermal Analysis & Calorimetry;2004, Vol. 77 Issue 3, p883 

    Reproducible measurements, reliable results and 1st order kinetics for the whole reaction are obtained during the thermal decomposition of dioxetanes only, if inclusions of impurities in commercial sample pans are blocked by additional thick (magnitude of 100 ?m) and close Al2O3 protective...

  • Effect of Solvent Deuteration in the Radiative Deactivation of Electronically Excited Uranyl Ion upon Phase Transitions in Aqueous Sulfuric Acid Solutions. Lotnik, S. V.; Khamidullina, L. A.; Kazakov, V. P. // Doklady Physical Chemistry;Sep2003, Vol. 392 Issue 1-3, p227 

    Discusses the effect of solvent deuteration in the radiative deactivation of electronically excited uranyl ion upon phase transitions in aqueous sulfuric acid solutions. Difference between the shapes of the lifetime versus temperature curves of the electronically excited uranyl ion; Approach for...

  • Thermodynamic Characteristics of Solution of Polar Nonelectrolytes in Magnetized Water. Vandyshev, V. N.; Koksharov, S. A. // Russian Journal of General Chemistry;Jun2003, Vol. 73 Issue 6, p838 

    The solution enthalpies of ten polar nonelectrolytes in water preliminarily exposed to a weak magnetic field were measured and compared with thermodynamic data for water and heavy water. The observed regularities provide evidence showing that magnetization affects physicochemical properties of...

  • Cu-Fe-Zn (Copper-Iron-Zinc). Raghavan, V. // Journal of Phase Equilibria & Diffusion;Aug2009, Vol. 30 Issue 4, p386 

    The article focuses on the metastable liquid miscibility gap measured in Copper-Iron (Cu-Fe) binary system. It is noted that a variety of peritectic reactions characterize Cu-Zinc (ZN). Further, it is also shown that face centered cubic (fcc), body centered cubic (bcc) and the close packed...

  • Theory of solutions in the energy representation. II. Functional for the chemical potential. Matubayasi, Nobuyuki; Nakahara, Masaru // Journal of Chemical Physics;8/22/2002, Vol. 117 Issue 8, p3605 

    An approximate functional for the chemical potential of a solute in solution is presented in the energy representation. This functional is constructed by adopting the Percus-Yevick-like approximation in the unfavorable region of the solute-solvent interaction and the hypemetted-chain-like...

  • Particle Arrangement Design for Predicting the Percolation Threshold of Silver/Epoxy Composite for Electrically Conductive Adhesive Application. Zulkarnain, M.; Husaini, Muhammad; Mariatti, M.; Azid, I. // Journal of Electronic Materials;Nov2015, Vol. 44 Issue 11, p4525 

    The early use of electrically conductive adhesives (ECAs) provided an alternative to solder because of their several advantages, such as good electrical conductivity, low cost, extendability to fine pitch of interconnecting material and environmental friendliness. According to previous works, an...

  • Thermochemical Study of Acid-Base Reactions of L-Valine in Salt Solutions. Zelenin, O. Yu.; Kochergina, L. A. // Russian Journal of General Chemistry;Feb2004, Vol. 74 Issue 2, p230 

    Heat effects of protonation and neutralization of L-valine were measured at 298.15 K, ionic strengths of the solutions of 0.25, 0.50, and 0.75, and on lithium, sodium, and potassium nitrate backgrounds. The heat effects of dissociation and neutralization of L-valine were extrapolated to zero...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics