Influence of polymer–surfactant aggregates on fluid flow

Malcher, Tadeusz; Gzyl-Malcher, Barbara

doi:10.1016/j.bioelechem.2012.01.011

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…Mainly internal structure formation and chemical reaction processes in polymer-micellar solutions are highlighted in a few published works related to this subject (DaRocha et al, 1999;Hou et al, 1999;Suksamranchit et al, 2006;Kim et al, 2011). The first attempts of drag reduction effect experimental examination have been performed, confirming that the simultaneous addition of polymer and surfactant with salt into the solvent, combine positive features of their purely polymer and micellar analogues providing additional extension of drag reduction zones (Matras et al, 2008;Malcher and Gzyl-Malcher, 2012;Mohsenipour and Pal, 2013b;. The pipeline drag reduction measurements reveal a considerable synergistic effect, that is, the mixed polymer-surfactant aggregates produce a significantly higher drag reduction, when compared with their pure polymer or pure surfactant equivalents.…”

Section: Introductionmentioning

confidence: 92%

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Intensification of drag reduction effect by simultaneous addition of surfactant and high molecular polymer into the solvent

Matras

Kopiczak

2015

Chemical Engineering Research and Design

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Clear existence of three drag reduction zones was observed: stable transitional zone, unstable transitional zone and in particular the third turbulent drag reduction zone.The dominant factor which influenced DR in the transitional zone was the addition of CTAB + NaSal. In the third zone, the addition of PEO had decisive influence on the DR intensity. The increase of PEO concentration enhanced DR in this zone.The influence of pipes diameter on the DR was investigated. The increase of pipe diameter caused clear extension of the stable transitional zone. In the third zone DR increased while decreasing pipe diameter.Analyses showed that the value of the n flow index was not an important factor in the DR.The results indicate that polymer-micellar solutions combine and intensify positive features of their pure polymer and micellar equivalents, providing efficient DR in a wider range of the Reynolds numbers.

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Section: Introductionmentioning

confidence: 92%

“…Nevertheless the researches indicate that this new effect requires a comprehensive experimental study to gain a deeper knowledge of this phenomenon (Matras et al, 2008;Malcher and Gzyl-Malcher, 2012;Mohsenipour and Pal, 2013b;.…”

Section: Introductionmentioning

confidence: 99%

Intensification of drag reduction effect by simultaneous addition of surfactant and high molecular polymer into the solvent

Matras

Kopiczak

2015

Chemical Engineering Research and Design

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“…Surfactants and polymers are often mixed together for a variety of applications. − For example, the presence of polymer reduces the free surfactant concentration in solutions and correspondingly reduces cytotoxicity, enhances drug carrier ability by increasing drug solubility, acts as a thickening agent to viscosify the solution, and maintains the stability of the colloidal structure . Nevertheless, solutions containing large polymers with small amphiphiles are also relevant to biological systems .…”

Section: Introductionmentioning

confidence: 99%

Effect of Surfactant Tail Length on the Hydroxypropyl Cellulose-Mediated Premicellar Aggregation of Sodium n-Alkyl Sulfate Surfactants

et al. 2021

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Polymer/surfactant composites have emerged as a subject of interest for their diverse applications. The improved solution properties in polymer/surfactant composites have been correlated to the formation of premicellar surfactant aggregate-polymer complexes (PS) at a surfactant concentration well below their critical micelle concentrations. Using different physicochemical and spectroscopic techniques here we have studied PS formed by hydroxypropyl cellulose, a nonionic-biocompatible polymer, and alkyl sulfate surfactants of different tail lengths. Our study shows that an increase in surfactant tail length eases PS formation and enhances PS-induced polymer cross-linking and, correspondingly, solution viscosity. PS consisting of shorter tail surfactants and those with longer tail surfactants differ microscopically as the former offers more polar interior than the later as evidenced from fluorescence measurements. Our study establishes that shorter tail surfactants intend to stay loosely packed inside PS and allow larger water penetration, which creates a relatively polar hydrophobic core compared to the PS with longer tail surfactants. The stronger packing of PS with longer tail surfactants is an outcome of favorable interaction between polymer polar groups and surfactant headgroups, which further creates strongly hydrogen-bonded water in their hydration shell.

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“…For example, Sanchez et al,[41] have reported the formation of larger aggregates at concentrations above the CMC for dirhamnolipid produced by Peudomonas aeruginosa. Despite the fact that the maximum concentration of biosurfactant employed was more than 5 times lower than the CMC, Malcher and Gzyl-Malcher[42] have also observed that salicylate ions facilitate the formation of polymermicelle aggregates by screening the electrostatic repulsions between the charge surfactant head groups. Thus, in this case, salicylic acid contributed to the formation of aggregates through a synergistic effect to a much greater extent than other compounds.…”

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confidence: 99%

The effect of the presence of biosurfactant on the permeation of pharmaceutical compounds through silicone membrane

Rodríguez‐López

Shokry

Cruz

et al. 2019

Colloids and Surfaces B: Biointerfaces

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The permeation of ten model drugs through silicone membrane was analysed to investigate the effect of the presence of a biosurfactant obtained from corn steep liquor. The ten selected pharmaceutical compounds were chosen to include a diverse range of physicochemical properties, such as variable hydrophobicities, pKa's, molecular masses and degrees of ionisation. When compared with compound permeation alone, the additional inclusion of biosurfactant in the donor phase altered the rate and extent of permeation. It significantly enhanced permeation for five of the compounds, whereas it decreased permeation for four of the compounds and remained approximately the same for the tenth compound. These effects were observed at both biosurfactant concentrations considered, namely 0.005 mg/mL, i.e. below the critical micellar concentration (CMC) and 0.500 mg/mL, i.e. above the CMC of the biosurfactant. Upon analysing permeation change with respect to physicochemical properties of the compounds, it was determined that compounds with a relative molecular mass below 200 resulted in an increase in permeation with biosurfactant present, and those above 200 resulted in a decrease in permeation with biosurfactant present. This effect was therefore attributed to the formation of a drug-biosurfactant interaction that enhanced permeation of smaller compounds, yet retarded permeation for those with a higher molecular mass. These in vitro findings can be considered an indication of potential novel formulation options that incorporate biosurfactant to create transdermal products that have bespoke permeation profiles.

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Influence of polymer–surfactant aggregates on fluid flow

Cited by 16 publications

References 42 publications

Intensification of drag reduction effect by simultaneous addition of surfactant and high molecular polymer into the solvent

Intensification of drag reduction effect by simultaneous addition of surfactant and high molecular polymer into the solvent

Effect of Surfactant Tail Length on the Hydroxypropyl Cellulose-Mediated Premicellar Aggregation of Sodium n-Alkyl Sulfate Surfactants

The effect of the presence of biosurfactant on the permeation of pharmaceutical compounds through silicone membrane

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