Emulsion-templated macroporous polymer/polymer composites with switchable stiffness

2014 ◽  
Vol 86 (2) ◽  
pp. 203-213 ◽  
Author(s):  
Qixiang Jiang ◽  
Angelika Menner ◽  
Alexander Bismarck
Keyword(s):  
Mechanical Properties ◽  
Methacrylic Acid ◽  
Elastic Moduli ◽  
Humidity Sensor ◽  
Crosslinking Density ◽  
Sensor Technology ◽  
Water Interface ◽  
Aqueous Emulsion ◽  
Internal Phase ◽  
Oil Water

Abstract Emulsion templates containing monomers in both emulsion phases were used to manufacture polystyrene-co-divinylbenzene based polymerized high internal phase emulsions (polyHIPEs) which have been reinforced by poly(methacrylic acid) (polyMAA) and poly(dimethyl aminoethyl methacrylate) (polyDMAEMA). The morphology of the hydrogel-filled polyHIPEs is affected by the hydrogels synthesized in the aqueous emulsion phase. The pore structure of polyMAA-filled polyHIPEs is highly interconnected indicating the formation of a methacrylic acid-co-styrene copolymer at the oil/water interface of the emulsion templates during synthesis. However, polyDMAEMA-filled polyHIPEs are predominately closed celled and the pore walls are covered by grafted hydrogel. The ability of the hydrogel-filled polyHIPEs to absorb water decreased with increasing crosslinking density of the hydrogels. The dry hydrogel reinforced the polyHIPE scaffolds possessed higher elastic moduli and crush strengths than the control polyHIPEs. The reinforcing ability of the dry hydrogels was further enhanced by increasing their degree of crosslinking. However, the reinforcement could be “switched off” simply by hydrating the hydrogels. The switchable mechanical properties of the hydrogel-filled polyHIPEs could potentially be utilized in smart humidity sensor technology.

scholarly journals Mechanical Properties of Solidifying Assemblies of Nanoparticle Surfactants at the Oil–Water Interface

Langmuir ◽  
2019 ◽  
Vol 35 (41) ◽  
pp. 13340-13350
Author(s):  
Anju Toor ◽  
Joe Forth ◽  
Simone Bochner de Araujo ◽  
Maria Consiglia Merola ◽  
Yufeng Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Interface ◽  
Oil Water

scholarly journals Formulation, Stability and Physicochemical Properties of Pickering Emulsions: An Overview

2019 ◽  
Vol 11 (1) ◽  
pp. 41 ◽  
Author(s):  
Papa Mady Sy ◽  
Sidy Mouhamed Dieng ◽  
Mounibe Diarra
Keyword(s):  
Pharmaceutical Industry ◽  
Physicochemical Properties ◽  
Solid Particles ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Internal Phase ◽  
Potential System ◽  
Oil Water ◽  
Formulation Stability ◽  
Targeted Release

This review work focuses mainly on the formulation, characterization, physicochemical properties and parameters of stability of emulsions stabilized by solid particles (Pickering emulsions). This concept of emulsions stabilized by particles strong knows a renewed interest in our days saw the benefits they present: good stability, protection of the environment, safety of users, types of particles etc. The adsorption of the solid particles at the oil-water interface is almost irreversible and strong, leading to the formation of a dense film, creating a barrier around the droplets and thus making the droplets very resistant to coalescence. Recently, the possibilities of application of emulsions stabilized by particles are considered in the pharmaceutical industry. This type of formulation may be a potential system of encapsulation of the active ingredients, allowing controlled and targeted release of the active ingredient from the internal phase.

Mechanical properties of reconstituted actin networks at an oil–water interface determined by microrheology

Soft Matter ◽  
2012 ◽  
Vol 8 (21) ◽  
pp. 5896 ◽  
Author(s):  
Dmitry Ershov ◽  
Martien Cohen Stuart ◽  
Jasper van der Gucht
Keyword(s):  
Mechanical Properties ◽  
Water Interface ◽  
Actin Networks ◽  
Oil Water

scholarly journals Films of bacteria at interfaces: three stages of behaviour

Soft Matter ◽  
2015 ◽  
Vol 11 (30) ◽  
pp. 6062-6074 ◽  
Author(s):  
Liana Vaccari ◽  
Daniel B. Allan ◽  
Nima Sharifi-Mood ◽  
Aayush R. Singh ◽  
Robert L. Leheny ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Interface ◽  
Three Stages ◽  
Oil Water

Films formed by bacteria at an oil-water interface display a varied series of dynamical and mechanical properties as they evolve through three stages of behavior: active, viscoelastic, and elastic.

Interplay of Hydrogen Bonding and Hydrophobic Interactions to Control the Mechanical Properties of Polymer Multilayers at the Oil–Water Interface

2014 ◽  
Vol 4 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Sandrine Le Tirilly ◽  
Corentin Tregouët ◽  
Stéphane Bône ◽  
Cédric Geffroy ◽  
Gerald Fuller ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Hydrophobic Interactions ◽  
Water Interface ◽  
Oil Water

Porous materials from cellulose nanocrystal and mxene surfactants at the oil/water interface

2020 ◽  
Author(s):  
Bingqing qian ◽  
Haiqiao Wang ◽  
Dong Wang ◽  
Hao-Bin Zhang ◽  
Jessica Wu ◽  
...  
Keyword(s):  
Porous Materials ◽  
Cellulose Nanocrystal ◽  
Water Interface ◽  
Oil Water

An analysis of the transport properties and mechanical stability of rapidly solidified Al-Sb alloy

2015 ◽  
Vol 10 (2) ◽  
pp. 2663-2681
Author(s):  
Rizk El- Sayed ◽  
Mustafa Kamal ◽  
Abu-Bakr El-Bediwi ◽  
Qutaiba Rasheed Solaiman
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Melt Spinning ◽  
Elastic Moduli ◽  
Mechanical Stability ◽  
Microstructural Analysis ◽  
Alloy System ◽  
Antimony Content ◽  
The Stability ◽  
Rapidly Solidified

The structure of a series of AlSb alloys prepared by melt spinning have been studied in the as melt–spun ribbons  as a function of antimony content .The stability  of these structures has  been  related to that of the transport and mechanical properties of the alloy ribbons. Microstructural analysis was performed and it was found that only Al and AlSb phases formed for different composition.  The electrical, thermal and the stability of the mechanical properties are related indirectly through the influence of the antimony content. The results are interpreted in terms of the phase change occurring to alloy system. Electrical resistivity, thermal conductivity, elastic moduli and the values of microhardness are found to be more sensitive than the internal friction to the phase changes. 

Polarizability and nonpolarizability of oil-water interfaces with relevance to a.c. impendance measurements

1991 ◽  
Vol 56 (1) ◽  
pp. 112-129 ◽  
Author(s):  
Takashi Kakiuchi ◽  
Mitsugi Senda
Keyword(s):  
Charge Transfer ◽  
Numerical Calculation ◽  
Supporting Electrolyte ◽  
Water Interface ◽  
Migration Effect ◽  
Ac Current ◽  
Stationary Interface ◽  
Oil Water ◽  
Anion Transfer

We have estimated the degree of polarizability of a polarized oil-water interface used as a working interface and that of the nonpolarizability of a nonpolarized interface used as a reference oil-water interface from the numerical calculation of dc and ac current vs potential behavior at both interfaces. Theoretical equations of dc and ac currents for simultaneous cation and anion transfer of supporting electrolytes have been derived for the planar stationary interface for reversible and quasi-reversible cases. In the derivation, the migration effect and the coupling of the cation and anion transfer have been incorporated. The transfer of ions constituting a supporting electrolyte contributes to the total admittance of the interface even in the region where the interface may be considered as polarized in dc sense, as pointed out first by Samec et al. (J. Electroanal. Chem. 126, 121 (1981)). Moreover, the reference oil-water interface is not ideally reversible, so that the contribution from this interface to the measured admittance cannot be negligible, unless the area of the reference oil-water interface is much larger than that of the working oil-water interface. The effect of non-ideality of the reference oil-water interface on the determination of double layer capacitances and kinetic parameters of charge transfer at the working oil-water interface has been estimated.

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