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  Subjects -> PHYSICS (Total: 779 journals)
    - ELECTRICITY AND MAGNETISM (8 journals)
    - MECHANICS (19 journals)
    - NUCLEAR PHYSICS (48 journals)
    - OPTICS (90 journals)
    - PHYSICS (566 journals)
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PHYSICS (566 journals)                  1 2 3 4 5 6 | Last

Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 7)
Acta Mechanica     Hybrid Journal   (Followers: 15)
Advanced Composite Materials     Hybrid Journal   (Followers: 17)
Advanced Functional Materials     Hybrid Journal   (Followers: 40)
Advanced Materials     Hybrid Journal   (Followers: 422)
Advanced Science Focus     Free  
Advances in Condensed Matter Physics     Open Access   (Followers: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 5)
Advances in High Energy Physics     Open Access   (Followers: 12)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 3)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 16)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 14)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 9)
Advances in Physics Theories and Applications     Open Access   (Followers: 8)
Advances in Remote Sensing     Open Access   (Followers: 9)
AIP Advances     Open Access   (Followers: 6)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 2)
American Journal of Applied Sciences     Open Access   (Followers: 32)
American Journal of Condensed Matter Physics     Open Access   (Followers: 5)
American Journal of Signal Processing     Open Access   (Followers: 8)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 2)
Annalen der Physik     Hybrid Journal   (Followers: 3)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 4)
Annales Henri PoincarĂ©     Hybrid Journal   (Followers: 1)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4)
Annals of Physics     Hybrid Journal   (Followers: 3)
Annals of West University of Timisoara - Physics     Open Access  
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 1)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 1)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 4)
APL Materials     Open Access   (Followers: 6)
Applied Composite Materials     Hybrid Journal   (Followers: 10)
Applied Physics A     Hybrid Journal   (Followers: 10)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 26)
Applied Physics Research     Open Access   (Followers: 6)
Applied Physics Reviews     Hybrid Journal   (Followers: 8)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 5)
Applied Remote Sensing Journal     Open Access   (Followers: 10)
Applied Spectroscopy     Full-text available via subscription   (Followers: 13)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 2)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 3)
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access  
Astronomy & Geophysics     Hybrid Journal   (Followers: 2)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 3)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 3)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 10)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 34)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 14)
Biomedical Imaging and Intervention Journal     Open Access   (Followers: 5)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 7)
BMC Nuclear Medicine     Open Access   (Followers: 5)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Bulletin of Materials Science     Open Access   (Followers: 39)
Bulletin of the Atomic Scientists     Full-text available via subscription   (Followers: 4)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de FĂ­sica     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (Followers: 1)
Case Studies in Nondestructive Testing and Evaluation     Open Access  
Cells     Open Access   (Followers: 1)
Central European Journal of Physics     Hybrid Journal   (Followers: 1)
CERN courier. International journal of high energy physics     Free  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 1)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cogent Physics     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 3)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 1)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 56)
Composites Part B : Engineering     Hybrid Journal   (Followers: 80)
Computational Astrophysics and Cosmology     Open Access  
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 19)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
Computational Particle Mechanics     Hybrid Journal  
Computational Science and Discovery     Full-text available via subscription  
Computer Physics Communications     Hybrid Journal  
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 12)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 3)

        1 2 3 4 5 6 | Last

Journal Cover   Colloid Journal
  [SJR: 0.31]   [H-I: 19]   [4 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3067 - ISSN (Online) 1061-933X
   Published by Springer-Verlag Homepage  [2302 journals]
  • Simulation of aerosol fibrous filters at Reynolds numbers of the order of
           unity
    • Abstract: Abstract The deposition of aerosol particles from a flow in a model filter composed of parallel rows of parallel fibers oriented normal to the flow direction has been studied at Reynolds numbers of the order of unity, Re ∼ 1, which are inherent in analytical filtration. The Oseen flow field in a row has been determined by the method of fundamental solutions. It has been shown that the drag forces of the fibers to the flow and the efficiencies of inertial particle collection on the fibers calculated based on the obtained field insubstantially differ from those calculated by the Navier-Stokes equations. The higher the filter packing density, the larger the Re numbers at which the drag forces begin to differ. In the case of inertial particle deposition, the difference between the collection efficiencies increases with the interception parameter. For rows with a/h > 0.2 (a is the fiber radius, and 2h is the interfiber distance in a row), including rows with a nonuniform arrangement of fibers, the calculations performed by both the linearized and complete Navier-Stokes equations yield almost equal results up to Re ∼ 1.
      PubDate: 2015-03-01
       
  • Effect of various factors on the Pt nanoparticle size produced in a
           microemulsion system
    • Abstract: Abstract Nano-sized platinum particles have been produced in AOT/cyclohexane/water microemulsion system. The effects of precursor (H2PtCl6) concentration, reducing agent (N2H4) concentration and W parameter value (W = [water]/[surfactant]) on the synthesized platinum nanoparticle size have been investigated. The synthesized Pt nanoparticles were characterized by using UV-visible absorption spectroscopy and scanning electron microscopy. The obtained data showed that the size of the synthesized Pt nanoparticles can be increased by increasing precursor or reducing agent concentrations as well as that of the water/surfactant molar ratio.
      PubDate: 2015-03-01
       
  • Fluctuating electric fields in electret gas filters
    • Abstract: Abstract Distribution functions of electric fields fluctuating in the vicinity of charged fibers have been calculated under the assumption of a random distribution of charges on a fiber surface. It has been shown that, at a distance of a few radii from the axis of a cylindrical fiber, the distribution function of electric field components has a Gaussian form. When approaching the fiber surface, the variance of the electric fields diverges, while the distribution function deviates from the normal law. Weakly decreasing tails arise in the probability density function at high field strengths. It has been shown that, on the fiber surface, the probability density function of the electric field component directed along the axis is described by the Cauchy distribution. The distribution of fields generated by a system of randomly located and randomly oriented charged or neutral fibers with dipole moments distributed along them has been studied. It has been shown that fluctuating electric fields can increase the filtration efficiency of electret filters.
      PubDate: 2015-03-01
       
  • On the unified mechanism of the action of surface forces of different
           natures
    • Abstract: Abstract Based on simple considerations, it has been shown that surface forces of different natures—electrostatic, dispersion, structural, and hydrophobic ones—are governed by the osmotic pressure of components present in a system.
      PubDate: 2015-03-01
       
  • Empirical equation for the prediction of viscosity for some common
           nanofluids
    • Abstract: Abstract A new model is proposed for calculating the relative viscosity of some common nanofluids. Based both on the available literature data and some theoretical considerations it was proposed that the relative viscosity can be calculated using only the values of densities of the particles and of the base fluid. The comparison of our results with existing empirical models using various concentrations and temperatures demonstrated that the proposed equation predicts satisfactory the experiments with an average error of about 4%. The model confirms the already published dependence of the relative viscosity on the variation of volume concentration, temperature and of the particle characteristics reported in some experimental studies. One can use the proposed model to predict the behavior of the system in the case of missing of contradicting experimental data and to develop innovative nanofluids.
      PubDate: 2015-03-01
       
  • On liquid evaporation from droplets of colloidal solutions of SiO 2 and Fe
           2 O 3 nanoparticles
    • Abstract: Abstract Liquid evaporation from Fe2O3 and SiO2 nanocolloid droplets has been studied. The geometry of the droplets has been juxtaposed with the intensity of light transmitted through them. It has been established that the droplet evaporation process may be divided into a number of stages, with each of them being distinguished by a certain type of the behavior of suspended nanoparticles. The regularities of the formation of ring-shaped deposits, which are referred to as coffee-rings in the literature, have been investigated. The main features of the structures of the ring-shaped deposits resulting from evaporation of different dispersions are the same. The time of complete liquid evaporation determined by spectrometry has appeared to be longer than the time determined by visual monitoring of droplet geometry. A model has been proposed for the evaporation of droplets of colloidal solutions of nanoparticles.
      PubDate: 2015-03-01
       
  • Octadecylamine-based Langmuir-Blodgett films containing iron and copper
           hexacyanoferrates
    • Abstract: Abstract Octadecylamine (ODA)-based Langmuir-Blodgett films modified with metal hexacyanoferrates are promising ion-exchange systems. The analysis of compression isotherms has led to the conclusion that iron and copper hexacyanoferrates are embedded into ODA monolayers. Optimal conditions have been determined for transferring these hybrid films onto a solid substrate by the Langmuir-Blodgett method. The optimal time required for the formation of iron and copper hexacyanoferrates in the monolayer has been established with the use of spectrophotometric measurements. The transfer of ODA monolayers modified with iron and copper hexacyanoferrates onto a conducting substrate has been confirmed by atomic force microscopy. The EMF values of galvanic cells developed based on the ODA/Fe4[Fe(CN)6]3-KCl and ODA/Cu3[Fe(CN)6]2-NH4Cl systems have been shown to be close to the theoretical ones.
      PubDate: 2015-03-01
       
  • Transport properties of sodium chloride polycrystals with liquid
           intergranular interlayers
    • Abstract: Abstract The diffusion permeability, electric conductivity, and filtration coefficient of water-containing sodium chloride polycrystals have been measured. Based on the measurement results, the dynamic thickness of intergranular interlayers, which determines the transport properties of the material, has been calculated. For samples that are initially continuous, this value (120–130 nm) corresponds to the averaged capacity of the grain boundaries with respect to water independently determined by analytical methods. The dynamic thickness of the interlayers in pellets molded from a wetted NaCl powder under a high pressure is significantly smaller (about 20 nm).
      PubDate: 2015-03-01
       
  • A magnetic fluid for operation in strong gradient fields
    • Abstract: Abstract The properties of a magnetic fluid based on colloidal magnetite and VM-3 vacuum oil have been experimentally studied. The fluid is designed for a long-term operation in strong gradient magnetic fields. A variant of magneto-granulometric analysis has been proposed that makes it possible to determine the average magnetic moment, variance of magnetic moments, and number density of particles with no a priori assumptions of the particle size distribution. Magneto-granulometric and cluster analyses of the magnetic fluid have been carried out. It has been shown that individual particles with an average diameter of the magnetic core of 7 nm, which is markedly smaller than those in common commercial fluids, prevail in the studied solution. The volume concentration of multiparticle clusters is also low; their total contribution to the initial magnetic susceptibility of the fluid only slightly exceeds 3%. The small particle sizes and the low cluster concentration provide the colloidal solution with a high stability in a strong magnetic field and a centrifugal force field at a rather high saturation magnetization of the solution.
      PubDate: 2015-03-01
       
  • Diffusion coefficients and viscosities of aqueous solutions of
           alkyltrimethylammonium bromides
    • Abstract: Abstract Dynamic light scattering and capillary viscometry have been employed to study aqueous micellar solutions of nonionic (pentaoxyethylene dodecyl ether) and ionic (decyl-, dodecyl-, and tetradecyltrimethyammonium bromides) surfactants in a wide concentration range covering the first and second critical micelle concentrations (CMC1 and CMC2, respectively). The concentration curve for the diffusion coefficient of the nonionic surfactant has been shown to correspond to a monotonically decreasing function. The diffusion coefficients of the ionic surfactants pass through maxima above CMC1. As the alkyl chain length increases, the slopes of the concentration curves rise in the range of the linear growth in the diffusion coefficient, while the values of the maxima increase, their positions shifting toward lower concentrations. The concentration dependences of the diffusion coefficients have been explained based on their relation to activity coefficients.
      PubDate: 2015-03-01
       
  • Simulation of parameters of submicron particles formed in combustion
           products of coals
    • Abstract: Abstract Thermodynamic analysis of the composition of combustion products have been performed for 15 types of coals with and without allowance for potassium and sodium aluminosilicates. Based on the results obtained, a closed model has been proposed for the formation of submicron particles in the combustion products of the coals, which enables one to obtain the upper estimate for the content of submicron particles in these products. The bulk condensation of potassium sulfate vapor in the flow of the combustion products and upon their cooling along a technological path has been numerically simulated by means of computer-assisted realization of the proposed model. The number concentration and size distribution of the formed particles have been determined. Agreement with experimental data on the average particle size has been reached at a reasonable value of a free parameter of the model.
      PubDate: 2015-03-01
       
  • The effect of the mechanical activation dose on the defective structure of
           artificial graphite
    • Abstract: Abstract Energy parameters (dose D and the work of surface formation) have been determined for the formation of a defective structure as a result of mechanical activation of graphite. Graphite activation has been shown to be a two-stage process: at low doses (D ≤ 20 kJ/g), the disruption and shift of graphite particles are the main processes, which are accompanied by a reduction in particle size, formation of meso- and micropores, and a rise in the BET specific surface area to 450–550 m2/g predominantly due to the development of a slitlike mesoporosity. At the same time, the crystalline structure of graphite is transformed into a turbostrate one with a concomitant increase in the lattice parameter and a decrease in the sizes of coherentscattering regions. The shape of diffraction lines can be described under the assumption that several fractions with greatly different degrees of defectiveness coexist in graphite. At higher doses, turbostrate graphite is transformed into X-ray amorphous carbon with a concomitant decrease in the specific surface area and meso- and microporosity. The defects resulting from the mechanical activation cannot be completely annealed at 2800°C. The main parameter of mechanical activation is the dose of supplied energy D = J g t (J g is the specific power consumption, and t is the duration of the activation). The curves describing accumulation of different defects can be represented in the form of a unified dependence on the dose for the J g and, accordingly, t values varied by more than an order of magnitude (J g = 1.7–22 W/g).
      PubDate: 2015-03-01
       
  • The initial stage of mechanical alloying in Cr-Fe binary systems
    • Abstract: Abstract The initial stage of mechanical alloying in Cr-Fe binary systems with atomic ratios of 80: 20 and 99: 1 (57Fe) has been studied by Auger spectroscopy, X-ray diffraction, and Mössbauer spectroscopy. Cr(Fe) x O y oxide clusters are formed at the sites of the contact between Cr and 57Fe particles at the earliest stages of mechanical treatment of the Cr(99)/57Fe(1) mixture. As the treatment duration is increased and a nanostructured state develops, oxide clusters are destroyed and O dissolves in the Cr matrix to increase the lattice parameter of Cr. As the nanostructure is formed in Cr, Fe atoms penetrate through the grain boundaries into the close-to-boundary distorted zones and then into the grain bulk. The process is characterized by a nonuniform concentration distribution of Fe atoms in Cr. The yield of reaction products and specific surface area of grain boundaries have been established to linearly depend on the mechanical energy dose at the initial stage of mechanical alloying.
      PubDate: 2015-03-01
       
  • A study of cryostructuring of a polymer system. 39. Poly(vinyl alcohol)
           composite cryogels filled with chitosan microparticles
    • Abstract: Abstract Composite macroporous poly(vinyl alcohol) (PVA) cryogels have been prepared by cryogenic treatment (freezing at −20°C for 12 h followed by defrosting at a rate of 0.03°C/min) of dispersions of chitosan particles swollen in an aqueous 120 g/L PVA solution. The elasticity moduli and fusion temperatures have been determined for corresponding samples, and their microstructure has been investigated by optical microscopic examination of their thin sections. The rigidity and heat endurance of the PVA-chitosan composite cryogels have been shown to increase with filler concentration. In addition, the rheological properties of initial dispersions have been studied and the appearance of adhesion contacts between discrete and continuous phases has been revealed already at the stage of dispersion preparation. The optical microscopic investigations of the morphological features of the initial dispersions and the microstructure of the composites have established a relatively uniform distribution of filler particles in the bulk of composite cryogels. It has been shown that chitosan particles incorporated into the matrix of the macroporous PVA cryogel are capable of sorbing heavy metal ions—in particular, bivalent copper ions—from aqueous solutions.
      PubDate: 2015-03-01
       
  • Defective structure and reactivity of mechanoactivated
           magnesium/fluoroplastic energy-generating composites
    • Abstract: Abstract Mechanical activation has been employed to produce highly reactive energy-saturated Mg/(-C2F4-) n composites, chemical transformations in which are initiated by either heating or shock-wave loading. The structure and reactivity of these composites have been analyzed with the use of X-ray diffraction, microscopy, thermogravimetry, calorimetry, and the measurement of combustion and detonation velocities. Mechanical activation is accompanied by the formation of a magnesium/fluoroplastic composite structure with the intercomponent contact area as large as 6 m2/g and accumulation of chaotically arranged dislocations to concentrations as high as 6 × 1010 cm−2, basal and prismatic deformation stacking faults (the maximum probabilities of their formation are 2.1 and 1.4%, respectively), and boundaries of coherent-scattering regions in magnesium. In fluoroplastic, disordering and partial amorphization of the structure take place. Mechanical activation leads to a dramatic increase in the propagation velocity of Mg + (-C2F4-) n → MgF2 + C chemical reaction in the explosive combustion regime (to 400 m/s) and the development of knocking combustion, in which the reaction propagates at a velocity as high as 1100 m/s. The optimal dose of mechanical activation (7–8 kJ/g), at which the maximum velocity of reaction propagation is reached, has been determined. The use of a “slow” heating in the cell of a calorimeter in combination with the mass-spectral analysis of evolved gases has made it possible to distinguish processes of three types in the thermally activated interaction between magnesium and fluoroplastic. The formation of MgF2 at temperatures below 300°C seems to be due to the interaction between defects in magnesium (dislocations and stacking faults) and macromolecules. The reaction occurring at 300–420°C with a slight thermal effect is caused by the solid-phase interaction between magnesium and fluoroplastic brought in contact with one another. The main contribution to the conversion is made by the processes that take place at temperatures above 420°C and are relevant to the thermal depolymerization of fluoroplastic. The layered structure of the composite and the large area of the intercomponent contact ensure the penetration of gaseous products of depolymerization into the bulk of magnesium particles and the completeness of the interaction.
      PubDate: 2015-03-01
       
  • One-pot synthesis of monolithic macroporous polymethylsilsesquioxane
           absorbing oil
    • Abstract: Abstract Single-stage synthesis of monolithic meso/macroporous polymethylsilsesquioxane in a neutral aqueous solution without the use of a catalyst and heating has been described. Calcination at temperatures of no higher than 300°C yields a superhydrophobic material capable of absorbing oil pollutants from water surface.
      PubDate: 2015-03-01
       
  • Evolution of microstructure of lithium fluoride crystals upon their
           vibrodispersion in ultraweak fields of thermalized neutrons
    • Abstract: Abstract BET adsorption, electron-microscopy, and X-ray diffraction analysis have been employed to study the vibrodispergating kinetics of crystalline lithium fluoride particles under conditions of simultaneous irradiation of the material with a flux of thermalized neutrons with low intensity I = 100 neutron/(cm2 s). It has been found that, during vibratory treatment of the powder, the stationary state of the material microstructure is reached much earlier than the limiting (equilibrium) value of its external (specific) surface area is established. The reaction rate constants have been determined for the polygonization and recrystallization, which take place in the material during its vibratory grinding. The influence of the neutron irradiation on the numerical values of these constants has been revealed. The energy parameters of the processes occurring in the system have been analyzed taking into account the heat release caused by neutron absorption in the material.
      PubDate: 2015-03-01
       
  • Surface tension of cavitation pockets according to data of computer
           simulation of nucleation in a stretched fluid
    • Abstract: Abstract Surface tension γ and effective radius R of critical cavitation pockets in a stretched Lennard-Jones fluid have been determined from the data on pocket formation work W *. The W * value has been calculated in terms of the stationary homogeneous nucleation theory from the results of molecular dynamics simulation of the parameters of cavitation process in a range of reduced temperatures T* = k B T/ɛ = 0.35–0.8. The calculated data have been approximated by the extended Tolman equation, which, in addition to linear correction (∼δ∞/R), takes into account the quadratic correction (∼l 2/R 2) for curvature to the surface tension of a critical pocket. It has been shown that parameter δ∞ is negative and amounts to a few tenths of an atom diameter, with the value of l being substantially dependent on temperature and reaching the diameter of a Lennard-Jones atom at the upper boundary of the considered temperature range.
      PubDate: 2015-03-01
       
  • Deposition of nanoparticles in model multilayer fibrous filters with a
           two-dimensional flow field
    • Abstract: Abstract The diffusion deposition of aerosol nanoparticles in model highly porous filters composed of equidistant rows of fibers, which are oriented normal to a flow and form ordered two-dimensional square and hexagonal structures, has been studied at low Reynolds numbers. Efficiencies η of particle collection on the fibers have been calculated as depending on number N of the rows of fibers in a wide range of Peclet numbers. It has been shown that the diffusion wake has a stronger effect for the model with the square structure, and a reduction in the average values of η with a rise in N, as compared with η for an isolated row, becomes more pronounced with an increase in the Peclet diffusion number.
      PubDate: 2015-01-01
       
  • Interfacial behavior of oil/oil and oil/water soluble binary surfactants
           and their effect on stability of highly concentrated W/O emulsions
    • Abstract: Abstract Instability of highly concentrated water-in-oil emulsions which contain a metastable inorganic salt solution in a form of drops arises from the crystallization of salt in the dispersed phase, both on the shelf and under high shear. In this work the interfacial properties of two binary mixtures of oil/oil soluble and oil/water soluble surfactants with different molar ratios were studied to determine their effect on the stability of manufactured emulsions. The two mixed surfactants used were mainly poly (isobutenyl) succinic anhydride (PIBSA)-based surfactant with either sorbitan monooleate (SMO) (oil/oil soluble) or with polyoxyethylene sorbitan monooleate (Tween 80) (oil/water soluble). Interfacial studies showed completely opposite behavior of these two mixtures with changing concentration of polymeric surfactant. A synergetic effect between PIBSA-Mea and Tween 80 molecules was evident. PIBSA/Tween 80 emulsions exhibited better shelf stability than the PIBSA-Mea/SMO mixtures due to the efficiently packed interfacial film produced by this synergetic binary surfactant mixture. In addition, a significant improvement in stability under high shear conditions was achieved with the oil/water soluble PIBSA/Tween 80 mixture. The results showed that the interfacial study are important for the understanding of instability due to crystallization in emulsions with an oversaturated dispersed phase
      PubDate: 2015-01-01
       
 
 
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