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  • 1
    Electronic Resource
    Electronic Resource
    Dissolution Kinetics of Hydroxyapatite (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 77-78 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The dissolution kinetics of synthetic hydroxyapatite do not seem to have been studied previously in detail. Single crystal studies are not yet feasible because large hydroxyapatite crystals cannot be readily prepared5, if at all. Data obtained on slurry systems would be complicated by the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212077a0
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  • 2
    Electronic Resource
    Electronic Resource
    Coil-to-globule transitions of interfacial copolymers in better than theta-solvents (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 622-627 
    Details
    ISSN: 1435-1536
    Keywords: Interfacial copolymers ; coil-to-globule transitions ; hydrophobically modified poly(acrylamides) ; poly(N-isopropylacrylamide) ; n-clusters
    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 Experimental studies of the coil-to-globule transitions exhibited in better than θ-solvents by interfacial copolymers ofN-isopropylacrylamide and acrylamide imply that a lower bound for the value of ‘n’ in then-clusters of poly(N-isopropylacrylamide) (PNIPAM) is 3. The corresponding upper bound is therefore likely to be 5 or 6. Statistical copolymers of PNIPAM containing upwards of 0.75 mole fraction of acrylamide (whose homopolymer does not itself displayn-clustering) exhibited this transition, which disappeared at higher mole fractions of acrylamide. Interfacial homopolymers ofN-ethylacrylamide and its statistical copolymers withN-isopropylacrylamide exhibitedn-clustering at all compositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653058
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  • 3
    Electronic Resource
    Electronic Resource
    A reversible transformation from enthalpic to entropic stabilization (1969)
    Springer
    Colloid & polymer science 234 (1969), S. 1149-1151 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01501097
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  • 4
    Electronic Resource
    Electronic Resource
    A diffraction theory approach to the total scattering by cubes (1967)
    Springer
    Colloid & polymer science 218 (1967), S. 41-46 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Theorie des anomalen Streueffekts von Würfeln wird betrachtet. Für drei verschiedene Anordnungen, Inzidenz der Flächen, Kanten und Ecken wird der totale Streukoeffizient abgeleitet. Ein Näherungsausdruck für den mittleren totalen Streukoeffizienten einer An einanderreihung von Würfeln, statistisch innerhalb des Streuvolumens orientiert, wird von diesen Anordnungen aus formuliert. Der Bereich der Lagen des PrimärMaximums und -Minimums in den totalen Streukoeffizientenkurven wird für Werte des relativen Brechungsindex der Grö\e von 2 erwartet.
    Notes: Summary The anomalous diffraction theory of cubes is considered. Three orientations, face, edge and corner incidence, are presented and the respective total scattering coefficients derived. An approximate expression for the average total scattering coefficient of an array of cubes, oriented randomly within the scattering volume, is formulated from these orientations. The range of the positions of the first primary maximum and minimum in the total scattering coefficient curves are expected to hold for values of the relative refractive index as large as 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01517274
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  • 5
    Electronic Resource
    Electronic Resource
    Flocculation of Latices by Low Molecular Weight Polymers (1973)
    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 34-35 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We now report that even low molecular weight non-ionic polymer molecules (Mv^103 to 104) are able to flocculate some polymer latices. They also seem to function by a bridging mechanism but require the presence at the particle surfaces of suitable groups with which the flocculant can interact ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/246034a0
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  • 6
    Electronic Resource
    Electronic Resource
    Steric stabilization II (1973)
    Springer
    Colloid & polymer science 251 (1973), S. 329-336 
    Details
    ISSN: 1435-1536
    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 A theory of steric stabilization is developed that is essentially an extension ofFischer's solvency theory. It treats both interpenetration and compression using a latice approach. This permits the introduction of segment density distribution functions. One virtue of the new theory is that it is in good qualitative agreement with the results of experiment. Some limitations of the theory are also noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01498731
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  • 7
    Electronic Resource
    Electronic Resource
    Steric stabilization I (1973)
    Springer
    Colloid & polymer science 251 (1973), S. 409-414 
    Details
    ISSN: 1435-1536
    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 A comparison is presented between the qualitative predictions of the various theories of steric stabilization with the results of experiments. It is shown that with the notable exception ofFischer's solvency theory, all of the theories advanced to-date are at odds with results of experiments. Possible reasons for these discrepancies are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01498687
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical prediction of the elastic contribution to steric stabilization (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 161-167 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, daß die Netzwerktheorie vonFlory benutzt werden kann, einfache analytische Ausdrücke zu entwickeln für den elastischen Anteil der sterischen Stabilisierung durch Makromoleküle. Konstante Segmentdichte und Gaußverteilung der Segmentdichte werden vorausgesetzt. Es ist wahrscheinlich, daß der elastische Anteil im Bereich der wechselseitigen Durchdringung vernachlässigt werden kann, aber wirksam wird bei merklicher Kompression. Die Anfangsstadien der Flockung hängen mit dem pseudosekundären Minimum zusammen, dessen Tiefe nahezu unabhängig ist von jedem elastischen Beitrag.
    Notes: Summary It is shown how it is possible to use the Flory network theory to develop simple analytic formulae for the elastic contribution (first proposed byJäckel) to the steric stabilization by macromolecules. Constant segment density and gaussian segment density distribution models are discussed. It seems likely that the elastic contribution is negligible in the interpenetration domain but becomes important as significant compression occurs. Incipient flocculation is inferred to occur in a pseudo-secondary minimum, the depth of which is almost independent of any elastic contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01777275
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  • 9
    Electronic Resource
    Electronic Resource
    Steric stabilization in worse thanθ-solvents (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 748-756 
    Details
    ISSN: 1435-1536
    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 stabilization of colloidal particles by nonionic polymers that exhibit loopy adsorption is considered in terms of an exponentially decaying segment density distribution function. It is shown that the steric interaction, whether repulsive or attractive, in the interpenetrational domain is drastically reduced for an exponential function, compared with that for a constant or a Gaussian distribution function. This reduction originates in the small segment densities that occur in the outer regions of steric layers exhibiting loopy adsorption. The net effect is that incipient instability in such systems can only be generated by significant penetration into the worse than 8-solvent domain. Any correlation between the critical flocculation point and the θ-point is thus weakened and stable dispersions can be prepared in worse than θ-solvents for the stabilizing chains in free solution. Both phenomena have been observed experimentally. It is predicted that, in general, the penetration into the worse than B-solvent domain will be greater for nonaqueous than for aqueous dispersion media. The conformational effects are reinforced by any changes in the thermodynamic parameters due to loopy adsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474105
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  • 10
    Electronic Resource
    Electronic Resource
    The slow convergence of the characteristic ratio of polymers terminally attached to an inert interface (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 1153-1158 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Monte-Carlo-Berechnungen haben empirisch gezeigt, daß das charakteristische Verhältnis (C n ) für kettenförmige Polymerenden nur allmählich konvergiert. Die Berechnungen zeigen, daßC n für Ketten in freier Lösung augenblicklich, für gebundene Ketten aber nur langsam konvergiert. Die analytischen Voraussagen stimmen sehr gut mit den Monte Carlo-Berechnungen für das gleiche Modell überein. Es wird außerdem gezeigt, daß diex-Komponente des “Persistence Vectors” divergent ist und mit der Quadratwurzel der Anzahl der Bindungen ansteigt. Die Bedeutung dieser Ergebnisse wird diskutiert für reale Systeme mit Ketten, die an einer Grenzfläche gebunden sind.
    Notes: Summary Monte Carlo calculations have demonstrated empirically the slow convergence of the characteristic ratio (C n ) of linear polymer tails. Analytical expressions are derived for bothC n and thex-component of the persistence vector for random flight chains attached to an inert interface. These show that whereasC n for the chain in free solution converges instantaneously, the characteristic ratio of the attached chain is only a slowly converging function. The analytical predictions are in good agreement with the Monte Carlo results on the same model. It is also shown that the x-component of the persistence vector is divergent, increasing as the square root of the number of bonds. The implications of these results for real chains attached to an interface are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382459
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