The Effect of Diameter Ratio and Volume Ratio on the Viscosity of Bimodal Suspensions of Polymer Latices

Greenwood, R.; Luckham, P.F.; Gregory, T.

doi:10.1006/jcis.1997.4915

Cited by 102 publications

(95 citation statements)

References 53 publications

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“…The volume mean size of our control sample was 142 nm and for coating with 1% PF68, almost 50 nm enhancement in size was observed which is comparable to the result obtained by Greenwood [25]. Since due to the poloxamer coating one peak remained in the size distribution (not shown), we assumed that all of the size increment was the result of the poloxamer coating.…”

Section: Discussionsupporting

confidence: 86%

Surface modification of HSA containing magnetic PLGA nanoparticles by poloxamer to decrease plasma protein adsorption

Shubhra

Tóth

Gyenis

et al. 2014

Colloids and Surfaces B: Biointerfaces

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Lifetime prolongation for hydrophobic drug carriers has been the focus of interest for many years. Poloxamer (Pluronic F68, PF68) has been employed in this study for modifying the surface of magnetic poly(D,L-lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) loaded with human serum albumin (HSA) model drug. Surface characteristics of untreated and PF68 treated NPs were analyzed by size, zeta potential and electrophoretic mobility studies. UV/VIS spectroscopic analysis, isothermal titration calorimetry (ITC) and dynamic light scattering methods were used to investigate serum protein (bovine serum albumin, BSA) adsorption. Results showed the successful surface attachment of PF68. Among different concentrations (0.1 to 1% wt/vol) of PF68 studied, 0.5% was found to be the most useful, since a higher concentration can issue in micelle formation. 50% less BSA tended to be adsorbed on the treated NPs in comparison to the untreated ones.

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Section: Discussionsupporting

confidence: 86%

Surface modification of HSA containing magnetic PLGA nanoparticles by poloxamer to decrease plasma protein adsorption

Shubhra

Tóth

Gyenis

et al. 2014

Colloids and Surfaces B: Biointerfaces

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“…Shariati et al [17] found good dispersion at 1.5-6 wt% for two-size silica nanoparticles of 17 and 65 nm diameters but did not find any considerable coactive effects on stiffness and fracture energy absorption. Such previous works have indicated that the interplay of particle content, size ratio, and composition ratio affect the particle distribution and subsequent collaborative effects, which is consistent with suggestions made by Greenwood et al [11,12] and Dames et al [13]. It is important to note that these previous studies focused on epoxy behavior under static loading, which may differ from that under dynamic loading owing to strain rate sensitivity of the epoxy and of matrix-filler interactions.…”

Section: Introductionsupporting

confidence: 83%

“…Composing an appropriate composition ratio between two sizes of silica particles for a given size ratio reduces viscosity and breaks up the agglomerate, thus improving particle dispersion [11][12][13][14]. Additionally, such bimodal silica particles induce more complex matrix-filler and inter-particle interactions, which generate concurring effects on epoxy dynamic properties [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Yohanes

Sekiguchi

2018

J. dynamic behavior mater.

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Dynamic stiffness and damping of epoxy adhesives are critical for ensuring the safety, reliability, and comfort of structures subjected to vibrations and impact loads. This study conducts split Hopkinson pressure bar (SHPB) tests to investigate the synergistic effects of silica micro-nanoparticles on these critical properties. Micro-nanoparticle content and composition ratio purity are varied at 2, 5, and 10% by weight (wt%) and from 0% (pure microparticles) to 100% (pure nanoparticles), respectively. Positive simultaneous stiffening and energy absorption effects are observed at a silica content of 5 wt% owing to improved nanoparticle dispersion; this increases the interface area and induces cooperative matrix-filler interactions. At this silica content and a composition ratio of 50%, stiffness and damping are 45 and 40% larger than those of neat epoxy, respectively. Silica micro-nanoparticles are less effective in improving particle dispersion at more than 5 wt%. Conventional mechanical dispersion is limited to applications below a certain silica content; the results suggest a simple, low-cost dispersion technique as an alternative to the in-situ technique and provide options for designing epoxy stiffness and damping appropriate for specific applications.

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“…When bimodal fillers were used, a minimum viscosity of the mixture was achieved at a suitable bimodal filler ratio, and it usually corresponded to the maximum packing fraction (MPF) of the filler. 23,25,30,31 The theoretical analysis of MPF and the viscosity measurement of the bimodal filler showed that the suitable ratio was 0.2-0.3. However, a remarkable decrease in the viscosity with control of the bimodal filler ratio was observed only at high filler contents.…”

Section: Density and Volume Percentagementioning

confidence: 99%

Effect of the filler size and content on the thermomechanical properties of particulate aluminum nitride filled epoxy composites

Yung

Zhu

Yue

et al. 2009

J of Applied Polymer Sci

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Polymer matrix composites based on brominated epoxy as the matrix and aluminum nitride (AlN) particles as the filler were prepared. The influences of the size, content, and size distribution of AlN on the thermomechanical properties, including the glass-transition temperature (T g ), coefficient of thermal expansion (CTE), dynamic storage modulus (E 0 ), dynamic loss modulus (E 00 ), and loss factor (tan d), of the composites were investigated by thermomechanical analysis and dynamic mechanical analysis. There was a total change trend for T g ; that is, T g of the composites containing nano-aluminum nitride (nano-AlN; 50 nm) was lower than that of the micro-aluminum nitride (micro-AlN; 2.3 lm) filled composites, especially at high nano-AlN contents. The T g depression of the composites containing nano-AlN was related to the aggregation of nano-AlN and voids in the composites. On the other hand, the crosslink density of the epoxy matrix decreased for nano-AlN-filled composites, which also resulted in a T g depression. The results also show that E 0 and E 00 increased, whereas tan d and CTE of the composites decreased, with increasing the AlN content or increasing nano-AlN fraction at the same AlN content. These results indicate that increasing the interfacial areas between AlN and the epoxy matrix effectively enhanced the dynamic modulus and decreased CTE. In addition, at a fixed AlN content of 10 wt %, a low E 0 of pre-T g (before T g temperature) and high T g were observed at the smaller weight ratio of nano-AlN when combinations of nano-AlN plus micro-AlN were used as the filler. This may have been related to the best packing efficiency at that weight ratio when the bimodal filler was used.

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The Effect of Diameter Ratio and Volume Ratio on the Viscosity of Bimodal Suspensions of Polymer Latices

Cited by 102 publications

References 53 publications

Surface modification of HSA containing magnetic PLGA nanoparticles by poloxamer to decrease plasma protein adsorption

Surface modification of HSA containing magnetic PLGA nanoparticles by poloxamer to decrease plasma protein adsorption

Synergistic Effects of Mixed Silica Micro-nanoparticles on Compressive Dynamic Stiffness and Damping of Epoxy Adhesive

Effect of the filler size and content on the thermomechanical properties of particulate aluminum nitride filled epoxy composites

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