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  • 1
    Electronic Resource
    Electronic Resource
    Fiber-Optic-Dynamic-Light-Scattering and Two-Color-Cross-Correlation Studies of Turbid, Concentrated, Sterically Stabilized Polystyrene Latex (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 4724-4727 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00012a024
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature sensitive microgel suspensions: Colloidal phase behavior and rheology of soft spheres (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 1705-1711 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rheological properties and the equilibrium colloidal phase behavior of concentrated dispersions of a temperature sensitive microgel were investigated. The temperature sensitive hydrogel particles consist of poly (N-isopropylacrylamid) (PNiPAM) chemically crosslinked with N,N′ methylenbisacrylamid (BIS). With increasing temperature the microgel particles decrease in size (hydrodynamic radius 142 nm at 10 °C and 58 nm at 35 °C) and with it the effective volume fraction, which leads to dramatic changes in rheology—vanishing yield stress and decreasing viscosity and elastic properties. The relative zero-shear viscosity and the plateau modulus at different temperatures superpose to mastercurves when plotted vs the effective volume fraction. The monodisperse hydrogel particles form colloidal crystals and glasses in concentrated solution but at higher effective volume fractions as compared to model hard sphere suspensions. Comparison of the experimental freezing point with soft sphere computer simulations indicate a repulsive interaction potential of the order 1/r12. The frequency independent shear modulus exhibited a power law concentration dependence which also agrees with the soft sphere behavior. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479430
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of uncompensated resistance on large-amplitude chronoamperometric experiments
    Amsterdam : Elsevier
    Electrochimica Acta 34 (1989), S. 1685-1688 
    Details
    ISSN: 0013-4686
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(89)85049-2
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  • 4
    Electronic Resource
    Electronic Resource
    Surface stoichiometric changes of n-GaAs after anodic treatment: An XPS study
    Amsterdam : Elsevier
    Surface Science 169 (1986), S. 414-424 
    Details
    ISSN: 0039-6028
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-6028(86)90622-9
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  • 5
    Electronic Resource
    Electronic Resource
    Surface stoichiometric changes of n-GaAs after anodic treatment: An XPS study
    Amsterdam : Elsevier
    Surface Science Letters 169 (1986), S. A188 
    Details
    ISSN: 0167-2584
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-2584(86)91256-9
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of brighteners on hydrogen evolution during zinc electroplating from zincate electrolytes (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 1107-1112 
    Details
    ISSN: 1572-8838
    Keywords: zinc deposition ; hydrogen evolution ; brighteners ; zincate electrolyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Hydrogen evolution during zinc electrodeposition on a steel substrate from zincate electrolytes containing different additives was studied using various experimental techniques.The hydrogen evolution reaction is limited by the electron transfer step. Hydrogen evolution is most intensive during the first seconds from the beginning of electrodeposition due to the lower overpotential of hydrogen on steel as compared with that on zinc. The evolved hydrogen is dissipated in three ways. Most is dissipated to the atmosphere via gas bubbles at a constant rate. Some is dispersed in the electrolyte some diffuses into the steel substrate, predominantly at the commencement of deposition. The additives affect both the total amount of evolved hydrogen and its distribution. The highest amount of hydrogen is evolved in the presence of the anisaldehyde bisulphite containing composite additive. The highest amount of hydrogen included in the substrate and remaining in the electrolyte corresponds to the use of the Na–N-benzylnicotinate containing additive. In this case blistering is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003443219874
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  • 7
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering from a hexagonal phase under shear (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 85-88 
    Details
    ISSN: 1435-1536
    Keywords: Hexagonal phase ; small-angle neutron scattering ; shear orientation ; nonionic surfactant ; lyotropic liquid crystal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The shear orientation of a micellar hexagonal liquid crystalline phase was investigated by small-angle neutron scattering. The hexagonal phase in the quiescent state showed a symmetrical scattering pattern typical of a polydomain structure. Enhanced scattering along the flow direction was observed during shear and the anisotropy of scattering intensity became stronger with increasing shear rate. The anisotropic scattering pattern corresponds to an orientation perpendicular to the flow direction and can be interpreted as a log-rolling state. The oriented sample did not relax after cessation of shear. The results from small-angle neutron scattering confirm data obtained previously from rheo-small angle light scattering measurements and are discussed in comparison to shear alignment of lyotropic liquid crystalline polymer solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658914
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  • 8
    Electronic Resource
    Electronic Resource
    Solution behavior of two liquid crystalline polymers of different architectures (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 568-576 
    Details
    ISSN: 1435-1536
    Keywords: Liquidcrystallinesidechainpolymers ; static anddynamiclightscattering ; semi-dilutesolutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Solutions of two different liquid crystalline polymers of high molecular weight are investigated by static and dynamic light scattering (LS), membrane osmometry and size-exclusion chromatography (SEC). Measurements in dilute solution in different solvents showed no specific behavior as formation of aggregates or chain stiffening. Large discrepancies between the LS results and the results from osmometry and SEC show that the latter methods are in the present cases not suitable for molecular weight determination. In semi-dilute solution the osmotic modulus and the time correlation function were studied. Behavior of flexible chains was observed. In one system a slight aggregation of small molecules onto longer chains was found causing less interpenetration of the chains in that solvent. At moderately high concentrations cluster formation was observed from i) a small angle excess scattering, ii) a downturn of the osmotic modulus, and iii) the appearance of a slow motion in the time-correlation function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410432
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of shear-induced structures in lyotropic mesophases by scattering experiments (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 90-96 
    Details
    ISSN: 1435-1536
    Keywords: Lamellar phase ; hexagonal phase ; vesicle ; viscosity ; neutron scattering ; light scattering ; SALS ; SANS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of shear on the structure of lyotropic liquid crystalline phases was investigated by small angle light and neutron scattering (SALS, SANS). Three different systems were studied involving nonionic and ionic surfactants: a hexagonal phase, a lamellar phase and a defective lamellar phase. Three different regimes are discussed in the hexagonal phase. A polydomain sample with dominating elastic properties, an aligned sample with the rodlike micelles being aligned in flow direction and characterized by a stripe texture. This texture can be disrupted at high shear rates leading to a further decrease of the moduli. Different regimes were also found with the defective lamellar phase. Multilamellar vesicles were formed at intermediate shear rates leading to an increase of viscosity. At higher shear rates these vesicles were destroyed and oriented lamellae were obtained. The lamellae were aligned with the layer normal parallel to the neutral (vorticity) axis. Vesicles were also obtained with a classical lamellar phase. Here the vesicles could not be destroyed at high shear rates but a butterfly pattern was observed in light and neutron scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182419
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of cross-link density on rheological properties of temperature-sensitive microgel suspensions (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 830-840 
    Details
    ISSN: 1435-1536
    Keywords: Key words Temperature-sensitive microgel ; Poly(N-isopropylacrylamide) ; Rheology ; Hard spheres ; Colloidal suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of the cross-link density on rheological properties of thermosensitive microgels was investigated. The temperature-sensitive hydrogel particles consisted of poly (N-isopropylacrylamide) (PNiPAM) chemically cross-linked with several different molar ratios of N,N′-methylenebisacrylamide. The variation of cross-link density leads to soft spheres that possess a different particle interaction potential and a different swelling ratio. With increasing temperature the microgel particles decrease in size and with it the effective volume fraction, which leads to strong changes in rheological properties. The relative zero-shear viscosity and the plateau modulus at different temperatures superpose to mastercurves when plotted versus the effective volume fraction. Up to an effective volume fraction of 0.5 the microgels behaved like hard spheres and the maximum volume fraction, as determined from the divergence of the zero-shear viscosity, was mainly dominated by the polydispersity of the spheres and not by the cross-link density. The plateau modulus, on the other hand, revealed soft-sphere behavior and the interaction potential became softer with decreasing cross-linker content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000329
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