Aqueous solution properties of oligo- and poly(ethylene oxide) by static light scattering and intrinsic viscosity

Kawaguchi, Seigou; Imai, Genji; Suzuki, Junto; Miyahara, Akira; Kitano, Toshiaki; Ito, Koichi

doi:10.1016/s0032-3861(96)00859-2

Cited by 355 publications

(349 citation statements)

References 42 publications

Supporting

Mentioning

304

Contrasting

Order By: Relevance

“…From the bond lengths and angles, the contour length per one ethylene oxide unit is 3.5Å, while the Kuhn length for poly(ethylene oxide) is about 10Å [46]. From these values R g =5Å is obtained for the hydrophilic chains of 5 EO units, which agrees with other theoretical calculations [47] and values calculated by extrapolation of experimental data of longer chains [48,49].…”

Section: Small-angle Neutron Scattering (Sans) Measurementssupporting

confidence: 85%

Erratum to: Solution behavior of aqueous mixtures of low and high molecular weight hydrophobic amphiphiles

et al. 2010

View full text Add to dashboard Cite

Mixtures of a hydrophobic triblock copolymer (L121, PEO 5 PPO 68 PEO 5 ) and a hydrophobic anionic surfactant (AOT, Sodium bis(2-ethylhexyl)sulfosuccinate), each alone forming turbid vesicular solutions in water, aggregate to produce a thermodynamically stable, transparent and isotropic solution. Mixed AOT/L121 aggregates could be confirmed by fluorescence, surface tension, differential scanning calorimetry (DSC) and isothermal titration calorimetry (ITC). In an isotropic region, where mixed aggregates are formed, there is a synergistic interaction between monomers of AOT and L121 in the mixture. In addition, Small Angle Neutron Scattering (SANS) experiments provided evidence that mixed aggregates have the shape of either spheres (with a certain polydispersity) or very short ellipsoids (axial ratio below 2), confirming a transition from giant multilamellar vesicles to small aggregates upon mixing the two hydrophobic amphiphiles. Upon dilution, the morphology changes to disk-like. From an examination of the results of all the methods the peculiar behavior of the mixed AOT/L121 system is explained.The online version of the original article can be found at http://dx.doi.

show abstract

Section: Small-angle Neutron Scattering (Sans) Measurementssupporting

confidence: 85%

Erratum to: Solution behavior of aqueous mixtures of low and high molecular weight hydrophobic amphiphiles

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The M w values vary from batch to batch between 9 and 12.5 kg/mol for a specified nominal M w of 10, 16-25 kg/mol for nominal M w of 20, and 28-38 kg/mol for nominal M w of 35 kg/mol, according to the supplier. This corresponds to polymer to particle size ratios n ¼ R g /R ¼ 0.03 6 0.008, 0.048 6 0.012, 0.067 6 0.016, respectively [Kawaguchi et al (1997)]. PEO concentration was varied between 1 and 10 g/l.…”

Section: Methodsmentioning

confidence: 99%

Effect of weak attractive interactions on flow behavior of highly concentrated crystalline suspensions

Weis¹,

Natalia²,

Willenbacher³

2014

Journal of Rheology

View full text Add to dashboard Cite

SynopsisWeak attractive interactions lead to a substantial broadening of the fluid-crystalline coexistence region of crystalline, colloidal hard-sphere dispersions. Here, we demonstrate that a weak depletion attraction introduced by nonadsorbing polymer added to the continuous phase results in a strong decrease of the low shear viscosity even at particle concentrations up to U ¼ 0.65 analogous to the re-entry phenomenon in highly concentrated glassy systems. This promotes flow in macroscopic channels but the scenario changes in confined, microfluidic geometries. Pure crystalline suspensions exhibit flow induced melting in the region of highest shear rates close to the wall, and this promotes flow through microchannels (<100 lm). In contrast, weak attractive interactions fortify preferential crystallization at the channel walls finally resulting in channel clogging and cessation of flow. This wall crystallization phenomenon particularly impairs viscosity determination from classical parallel plate rotational rheometry if the gap width is set too low. These findings may find application in the important biotechnological field of protein preparation and crystallization.

show abstract

“…[19][20][21][22][23][24] like the colloid concentration, c, expressed in g L À1 to reduced quantities like the colloid volume fraction, f, typically used in theoretical descriptions. To this end, we measure scattering intensities of a colloid/salt concentration series with SAXS, as shown in Fig.…”

Section: Colloid Characterizationmentioning

confidence: 99%

Phase behaviour of colloids with short-range repulsions plus nonadsorbing polymer chains

Gruijthuijsen¹,

Tuinier²,

Brader³

et al. 2013

Soft Matter

View full text Add to dashboard Cite

The colloidal gas-liquid phase behaviour has been studied for aqueous mixtures of well-defined spherical particles with shortranged repulsions mixed with relatively monodisperse poly(ethylene oxide) polymers. We show that our set of experimental phase diagrams are in quantitative agreement with theoretical predictions using generalized free volume theory [G. J. Fleer and R. Tuinier, Phys. Rev. E, 2007, 76, 041802]. The determination of the equilibrium composition of coexisting phases reveals qualitative deviations between the two, for which we propose a tentative explanation.

show abstract

Aqueous solution properties of oligo- and poly(ethylene oxide) by static light scattering and intrinsic viscosity

Cited by 355 publications

References 42 publications

Erratum to: Solution behavior of aqueous mixtures of low and high molecular weight hydrophobic amphiphiles

Erratum to: Solution behavior of aqueous mixtures of low and high molecular weight hydrophobic amphiphiles

Effect of weak attractive interactions on flow behavior of highly concentrated crystalline suspensions

Phase behaviour of colloids with short-range repulsions plus nonadsorbing polymer chains

Contact Info

Product

Resources

About