The Phase Behavior of Dispersions of Silica Particles in Mixtures of Polystyrene and Dimethylformamide

Zhou, Juan; Duijneveldt, Jeroen S. van; Vincent, Brian

doi:10.1021/la1003963

Cited by 19 publications

(30 citation statements)

References 41 publications

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“…4 GFVT can be extended to include the effect of screened Coulomb repulsions between the colloids, integrated into an effective colloid-colloid interaction radius, R eff . [7][8][9] Several experimental studies of colloid-polymer mixtures conrm the qualitative effects of additional repulsions, [9][10][11][12][13][14][15] as well as the quantitative shi of the binodal towards higher polymer concentrations. 9 We now present a set of experimental phase diagrams of aqueous dispersions containing charged polystyrene (PS) colloids and neutral poly(ethylene oxide) (PEO) polymer.…”

Section: Introductionmentioning

confidence: 99%

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

Gruijthuijsen¹,

Tuinier²,

Brader³

et al. 2013

Soft Matter

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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.

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Section: Introductionmentioning

confidence: 99%

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

Gruijthuijsen¹,

Tuinier²,

Brader³

et al. 2013

Soft Matter

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“…In reference [22], the van der Waals attraction energy (V A ) between the silica particles, at a separation equivalent to the diameter of two DMF molecules (DMF is known to be strongly bound to silica [30]), was estimated, resulting in the following values: V A = 0.5 kT for the 30 nm particles and 3.5 kT for the 200 nm particles. Since the average, thermal (translational) energy of the particles is ~1.5 kT, one may expect the smaller silica particles to be stable, even in the absence of any charge repulsion.…”

Section: Introductionmentioning

confidence: 99%

“…In the two previous papers by us on this topic [22,23] polystyrene was employed as the added, non-adsorbing polymer. DMF is a near-theta (Θ) solvent for polystyrene [22].…”

Section: Introductionmentioning

confidence: 99%

“…DMF is a near-theta (Θ) solvent for polystyrene [22]. Various parameters for the two polystyrene samples used, in DMF are listed in Table 1 where M w is the weight-average molar mass of the polymer, R g is its radius of gyration in the solvent concerned and N A is the Avagadro constant.…”

Section: Introductionmentioning

confidence: 99%

“…q values are also given in Table 1, for each polymer, with respect to the small particles (q s ) and the large particles (q l ). In the first paper [22] in this series we reported on the phase behavior of each of the two sizes In the second paper [23] we reported some preliminary studies on the phase behavior of the corresponding ternary systems, i.e. on mixtures of both sizes of silica particles, dispersed in DMF containing 40 mM LiCl, on the addition of polystyrene (M n = 115,000).…”

Section: Introductionmentioning

confidence: 99%

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Phase separation in mixtures of two sizes of silica particles dispersed in DMF on the addition of polystyrene

2011

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A Morphological Transition of Inverse Mesophases of a Branched‐Linear Block Copolymer Guided by Using Cosolvents

Shin

et al. 2015

Angewandte Chemie

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We report here as trategy for influencing the phase and lattice of the inverse mesophases of as ingle branchedlinear block copolymer (BCP) in solution which does not require changing the structure of the BCP.T he phase of the self-assembled structures of the blockc opolymer can be controlled ranging from bilayer structures of positive curvature (polymersomes) to inverse mesophases (triply periodic minimal surfaces and inverse hexagonal structures) by adjusting the solvent used for self-assembly.B yu sing solvent mixtures to dissolve the blockc opolymer we were able to systematically change the affinity of the solvent towardthe polystyrene block, which resulted in the formation of inverse mesophases with the desired lattice by self-assembly of as ingle branched-linear blockc opolymer.O ur method was also applied to an ew solution self-assembly method for ab ranched-linear block copolymer on as tationary substrate under humidity,w hich resulted in the formation of large mesoporous films.O ur results constitute the first controlled transition of the inverse mesophases of blockc opolymers by adjusting the solvent composition.The direct self-assembly of amphiphilic block copolymers (BCPs) into inverse bicontinuous structures in solution is an emerging strategy for creating highly ordered porous polymers with three-dimensionally interconnected networks of large pores. [1][2][3][4][5][6][7][8][9] In am anner similar to the self-assembly of lipids such as monoolein into colloidal particles of inverse bicontinuous cubic mesophases (cubosomes) in water, [10][11][12][13][14][15] BCPs in solution could be directly self-assembled into colloidal particles of inverse bicontinuous cubic phases of the BCP bilayer (polymer cubosomes). [1][2][3][4][5][6][7][16][17][18][19] We recently reported that diblock copolymers,composed of adendritic or branched hydrophilic block and ahydrophobic linear polymer block, preferentially self-assemble into triply periodic minimal surfaces (TPMSs) of the BCP bilayers in solution, resulting in the creation of polymer cubosomes having highly defined internal large-pore networks. [16][17][18] The TPMSs of the BCP bilayers exhibited distinct crystalline structures such as primitive cubic (Im3m,Psurface), double diamond (Pn3m,Dsurface), and gyroid (Ia3d,Gsurface) lattices,d epending on the architecture of the dendritic hydrophilic block as well as the block ratio between two distinct polymer domains.T he polymer cubosomes of these BCPs exhibited al arge surface area, which could be functionalized by implementing the desired functional groups through co-assembly with linear BCPs with a-functionalized hydrophilic blocks.M oreover,t he TPMSs of the BCP bilayer could be expanded to large-scale films by the diffusion of water under saturated humidity into ac oncentrated solution of BCP cast on as tationary substrate. [18] Our previous studies suggested that the branched architecture of the hydrophilic block played ac rucial role in the preferential self-assembly of branched-linear BCPs (Scheme 1) i...

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The Phase Behavior of Dispersions of Silica Particles in Mixtures of Polystyrene and Dimethylformamide

Cited by 19 publications

References 41 publications

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

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

Phase separation in mixtures of two sizes of silica particles dispersed in DMF on the addition of polystyrene

A Morphological Transition of Inverse Mesophases of a Branched‐Linear Block Copolymer Guided by Using Cosolvents

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