A new solution to emulsion liquid membrane problems by non‐Newtonian conversion

Skelland, A. H. P.; Meng, Xianglian

doi:10.1002/aic.690420224

Cited by 34 publications

(13 citation statements)

References 44 publications

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“…As mentioned before, Span 80 has been typically used as the emulsifier for stabilizing of the liquid membrane. However, several reports have mentioned to instability of membranes prepared by Span 80 [20][21][22][23][24][25]. In the present study, we also experienced several evidences of emulsion breakage for the emulsions prepared by Span 80.…”

Section: Effect Of Type and Concentration Of Surfactantsupporting

confidence: 62%

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Study on a new surfactant for removal of phenol from wastewater by emulsion liquid membrane

Mortaheb

Amini

Sadeghian

et al. 2008

Journal of Hazardous Materials

103

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Section: Effect Of Type and Concentration Of Surfactantsupporting

confidence: 62%

“…Numerous researches have noted to instability of liquid membrane due to breakage of the emulsion, which results in reduction in separation efficiency [16,25]. It is often tried to solve the instability problem by increasing of the surfactant concentration, and increasing of the membrane viscosity.…”

Section: Effect Of Stabilizermentioning

confidence: 99%

Study on a new surfactant for removal of phenol from wastewater by emulsion liquid membrane

Mortaheb

Amini

Sadeghian

et al. 2008

Journal of Hazardous Materials

103

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“…[82][83] Despite the high selectivity of liquid membranes, their applications are still restricted due to their limited stability. 84 Various researchers have prepared self-standing membranes with crown ether polymers. 63,[85][86][87] For instance, to a polymer consisting of alternating co-monomers of ethylene and maleic anhydride, crown ethers were attached as side groups.…”

Section: 78mentioning

confidence: 99%

“…These types of β-CD/ferrocene gels were investigated by a variety of research groups, [82][83][84][85] with the work of the Harada group having the highest impact.…”

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Functional macromolecules and smart polymer networks for ion separation, reduction and delivery

Zoetebier

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This thesis is part of NanoNextNL, a micro and nanotechnology innovation consortium of the Government of the Netherlands and 130 partners from academia and industry. More information on www.nanonextnl.nl. IntroductionSince decades, nature has been an inspiration for the fields of polymer chemistry and materials science. To date, it remains a challenge to mimic natural systems to attain their desired properties. 1-2Traditional polymers can generally meet particular parameters one at a time. For example mechanical properties can be improved but often without enhancement of other materials parameters. The same also holds for other properties. In contrast, natural polymers developed during genesis often possess a set of properties which have been simultaneously optimized to achieve a given task. In the field of materials science, chemical properties are combined with structural and surface properties, mimicking, for instance, the gecko foot and the lotus leaf.Self-assembly at different length scales, one of the key elements that nature presents to us, provides simple building blocks for otherwise difficult to achieve structures, which are preferentially assembled through supramolecular chemistry. 5The dynamic, stimuli-responsive character of these interactions provide adaptive reversible connections in many molecular processes and materials. For example, molecular recognition processes can trigger biological responses, awakening the field of biosensors and actuators. 6 The Mimosa pudica, a plant which folds its leafs upon receiving a stimulus, is another fascinating example of the responsiveness of natural systems. Upon a touch or air movement, a release of chemicals is triggered which causes water removal and subsequent cell collapse, giving rise to the folding of its leafs. 7These are just a few examples of the materials and objects developed and evolved over time by nature. Biomimetics brings together scientists from different fields in an attempt to create e.g., molecular-scale devices, nanomedicine, actuators, selfChapter 1 3 assembling and self-healing materials and tools for molecular sensing and recognition.In the related fields of stimulus responsive hydrogels and ionic polymer-metal composite actuators, research is focused on achieving comparable responses with synthetic materials. In this thesis attention will be paid to hydrogels and "unconventional" polymers that incorporate inorganic elements in their main chain. Concept of this thesisThe concept of the research described in this thesis is centered around the synthesis, characterization and function of novel organometallic polyanions, polycations, and their corresponding hydrogels and the exploration of the use of these redox-responsive water-soluble or water-swellable materials in metal nanoparticle fabrication and transfection. In addition, crown ether-functionalized aromatic polymers and organometallic polymers will be employed for ion separation and sensing.Chapter 2 summarizes the field of stimulus responsive polymers, focusing on redox res...

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The influence of system parameters on the stability of colloidal liquid aphrons

Scarpello

Stuckey

1999

J. Chem. Technol. Biotechnol.

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An investigation was carried out on the effect of process parameters involved in Pre‐Dispersed Solvent Extraction (PDSE) on the stability and interactions in dilute dispersions of Colloidal Liquid Aphrons (CLAs). The aim of this work was to derive empirically‐based engineering relationships that could be used in the design of PDSE processes. For this investigation, CLAs were formulated with an Aliquat 336/n‐octanol/Softanol 120 solvent phase, and a Synperonic A20 aqueous phase. These CLAs were intended for use in the reactive pre‐dispersed solvent extraction of polar solutes such as phenylalanine. Light scattering measurements over a range of continuous aqueous and CLA phase conditions were used as a method of obtaining a measure of the rate of disappearance of CLAs from dispersion (a measure of stability), and a comparison of stability under different conditions. Two forms of CLA interaction occurring by independent mechanisms were identified – CLA break‐up, and CLA flocculation. Break‐up was found to be a first order process, allowing CLA stability to be characterised by a first order half‐life (typical half‐life 15–40 min). This was proposed to occur on collision of CLAs with sufficient energy to overcome the stabilising forces provided by the surfactants at the interfaces of the CLAs. It was shown that flocculation occurred at high ionic strengths (>0.1 M NaCl), and that it was not part of the break‐up mechanism. An apparent size dependent CLA half‐life was proposed to be due to smaller particles having a lower collision energy on average. The data suggested that the resistance to CLA break‐up was not charge repulsion, but derived from an interaction between molecules of one of the surfactants making up the aqueous ‘shell’ of the CLAs (Synperonic A20). Finally, the basis for a semi‐empirical design equation for prediction of CLA half‐life developed from the Arrhenius equation was proposed. © 1999 Society of Chemical Industry

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A new solution to emulsion liquid membrane problems by non‐Newtonian conversion

Cited by 34 publications

References 44 publications

Study on a new surfactant for removal of phenol from wastewater by emulsion liquid membrane

Study on a new surfactant for removal of phenol from wastewater by emulsion liquid membrane

Functional macromolecules and smart polymer networks for ion separation, reduction and delivery

The influence of system parameters on the stability of colloidal liquid aphrons

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