Archive for the ‘Hot Article’ Category

Block Copolymer Spheres or Block Copolymer Worms: Which Pickering Emulsifier Has More Backbone?

This recent publication from the Armes group investigates the ability of a number of amphiphilic block copolymer nanoparticles to stabilize n-dodecane-in-water emulsions. The aim of the work was to compare spherical and worm-like nano-structures and their efficiency as Pickering emulsifiers, i.e. the ability of these solid particles to adsorb irreversibly at the liquid-liquid interface to form a Pickering emulsion.

Graphical abstract: Are block copolymer worms more effective Pickering emulsifiers than block copolymer spheres?

In previous work by the University of Sheffield group, a number of both linear and branched block copolymers were produced in the form of vesicular structures. It was found that branching was necessary in order to prevent the vesicles dissociating into individual copolymer chains when exposed to high-shear homogenization. In this work linear and branched analogues of the copolymer poly(glycerol monomethacrylate)–poly(2-hydroxypropyl methacrylate) (PGMA-PHPMA) are synthesized as both spherical and worm-like nanoparticles. Armes et al. report that the linear nano-structures are not sufficiently robust enough to survive the high-shear conditions necessary for emulsification, whereas the cross-linked copolymer structures are more likely to retain their morphologies and yield genuine Pickering emulsions. Spherical and worm-like structures are provided greater covalent stabilization via chemical cross-linking, allowing structures to survive homogenization as with the vesicles reported previously.

The use of the more hydrophobic poly(benzyl methacrylate) (PBzMA) in place of PHPMA was also investigated in order to examine if increased amphiphilicity could enhance the stability of linear nano-objects in the absence of chemical cross-linking. Both the spherical and worm-like structures comprised of these linear polymer chains formed stable Pickering emulsions, suggesting that branching is not mandatory for the formation of the particulate surfactants.

Due to strong adsorption at the liquid-liquid interface and their ability to produce smaller droplets at a given nanoparticle concentration, it is concluded that branched copolymers with worm-like morphologies are the more effective Pickering emulsifiers. This is also aided by the suggestion that they are at least as efficiently adsorbed at the interface as their spherical analogues.

K. L. Thompson, C. J. Mable, A. Cockram, N. J. Warren, V. J. Cunningham, E. R. Jones, R. Verber and S. P. Armes

This post was written by web writer Rob Woodward. Rob is currently based in Imperial College London working in the Polymer and Composite Engineering (PaCE) group. Rob has a background in both responsive polymeric surfactants and microporous organic polymers for carbon capture and storage.

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HOT articles for October!

 
Magneto-optic and converse magnetoelectric effects in a ferromagnetic liquid crystal
Alenka Mertelj, Natan Osterman, Darja Lisjak and Martin Čopič 

 Graphical abstract: Magneto-optic and converse magnetoelectric effects in a ferromagnetic liquid crystal
 
Trajectories of probe spheres in generalized linear viscoelastic complex fluids
Manas Khan and Thomas G. Mason  

Graphical abstract: Trajectories of probe spheres in generalized linear viscoelastic complex fluids

These articles will be free until 29th October 2014


Capillary tube wetting induced by particles: towards armoured bubbles tailoring
Farzam Zoueshtiagh, Michael Baudoin and David Guerrin

Graphical abstract: Capillary tube wetting induced by particles: towards armoured bubbles tailoring

 
Measuring cellular forces using bis-aliphatic hydrazone crosslinked stress-relaxing hydrogels
D. D. McKinnon, D. W. Domaille, T. E. Brown, K. A. Kyburz, E. Kiyotake, J. N. Cha and K. S. Anseth

Graphical abstract: Measuring cellular forces using bis-aliphatic hydrazone crosslinked stress-relaxing hydrogels

These articles will be free until 13th November 2014


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HOT articles for September!

Engineering entropy in soft matter: the bad, the ugly and the good
Fernando A. Escobedo 

Graphical abstract: Engineering entropy in soft matter: the bad, the ugly and the good

3D Viscoelastic traction force microscopy
Jennet Toyjanova, Erin Hannen, Eyal Bar-Kochba, Eric M. Darling, David L. Henann and Christian Franck

Graphical abstract: 3D Viscoelastic traction force microscopy

These articles will be free until 10th October 2014


 
Approach to universal self-similar attractor for the levelling of thin liquid films
Michael Benzaquen, Paul Fowler, Laetitia Jubin, Thomas Salez, Kari Dalnoki-Veress and Elie Raphaël  

Graphical abstract: Approach to universal self-similar attractor for the levelling of thin liquid films
 
Discovery of a tetracontinuous, aqueous lyotropic network phase with unusual 3D-hexagonal symmetry
Gregory P. Sorenson, Adam K. Schmitt and Mahesh K. Mahanthappa  

Graphical abstract: Discovery of a tetracontinuous, aqueous lyotropic network phase with unusual 3D-hexagonal symmetry

These articles will be free until 15th October 2014


Extracting the dynamic correlation length of actin networks from microrheology experiments
Adar Sonn-Segev, Anne Bernheim-Groswasser and Yael Roichman

Graphical abstract: Extracting the dynamic correlation length of actin networks from microrheology experiments

Tuning the surface properties of hydrogel at the nanoscale with focused ion irradiation
Y. Kim, A. Y. Abuelfilat, S. P. Hoo, A. Al-Abboodi, B. Liu, Tuck Ng, P. Chan and J. Fu  

Graphical abstract: Tuning the surface properties of hydrogel at the nanoscale with focused ion irradiation 
 

These articles will be free until 22nd  October 2014


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HOT articles for August!

Thermal transitions in hydrated layer-by-layer assemblies observed using electrochemical impedance spectroscopy
Choonghyun Sung, Katelin Hearn and Jodie Lutkenhaus

Graphical abstract: Thermal transitions in hydrated layer-by-layer assemblies observed using electrochemical impedance spectroscopy


Structural and mechanical characteristics of polymersomes
Hung-Yu Chang, Yu-Jane Sheng and Heng-Kwong Tsao

Graphical abstract: Structural and mechanical characteristics of polymersomes

These articles are free to access until 5th September 2014

 


Crystallizing hard-sphere glasses by doping with active particles
Ran Ni, Martien A. Cohen Stuart, Marjolein Dijkstra and Peter G. Bolhuis  

Graphical abstract: Crystallizing hard-sphere glasses by doping with active particles

Phase transitions in supported lipid bilayers studied by AFM
Andrea Alessandrini and Paolo Facci

Graphical abstract: Phase transitions in supported lipid bilayers studied by AFM

These articles are free to access until 11th September 2014


Prediction and validation of diffusion coefficients in a model drug delivery system using microsecond atomistic molecular dynamics simulation and vapour sorption analysis
Christopher Forrey, David M. Saylor, Joshua S. Silverstein, Jack F. Douglas, Eric M. Davis and Yossef A. Elabd

Graphical abstract: Prediction and validation of diffusion coefficients in a model drug delivery system using microsecond atomistic molecular dynamics simulation and vapour sorption analysis

 
Biobased building blocks for the rational design of renewable block polymers
Angela L. Holmberg, Kaleigh H. Reno, Richard P. Wool and Thomas H. Epps, III 

Graphical abstract: Biobased building blocks for the rational design of renewable block polymers

These articles are free to access until 18th September 2014


 
Highly ordered 2D microgel arrays: compression versus self-assembly
Karen Geisel, Walter Richtering and Lucio Isa  

Graphical abstract: Highly ordered 2D microgel arrays: compression versus self-assembly
Evidence for equilibrium gels of valence-limited particles
Nikola A. Dudukovic and Charles F. Zukoski

Graphical abstract: Evidence for equilibrium gels of valence-limited particles

These articles are free to access until 25th September 2014


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HOT articles for July!

Capillary bridge rupture in dip-pen nanolithography
Daniel J. Eichelsdoerfer, Keith A. Brown and Chad A. Mirkin  

 Graphical abstract: Capillary bridge rupture in dip-pen nanolithography
 
A universal scaling law of grain chain elasticity under pressure revealed by a simple force vibration method
Lichen Chai, Xuebang Wu and C. S. Liu    

Graphical abstract: A universal scaling law of grain chain elasticity under pressure revealed by a simple force vibration method

These papers are free to access until 3rd August 2014


Growth of equilibrium structures built from a large number of distinct component types
Lester O. Hedges, Ranjan V. Mannige and Stephen Whitelam   

 Graphical abstract: Growth of equilibrium structures built from a large number of distinct component types

Branched–linear polyion complexes investigated by Monte Carlo simulations
Daniel G. Angelescu and Per Linse  

Graphical abstract: Branched–linear polyion complexes investigated by Monte Carlo simulations

 
The adsorption–desorption behaviour and structure function relationships of bile salts
Roger Parker, Neil M. Rigby, Michael J. Ridout, A. Patrick Gunning and Peter J. Wilde  
Graphical abstract: The adsorption–desorption behaviour and structure function relationships of bile salts

Tiling patterns from ABC star molecules: 3-colored foams?
Jacob J. K. Kirkensgaard, Martin C. Pedersen and Stephen T. Hyde  
Graphical abstract: Tiling patterns from ABC star molecules: 3-colored foams?

These papers are free to access until 21st  August 2014


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HOT articles for June!

Director/barycentric rotation in cholesteric droplets under temperature gradient
Jun Yoshioka, Fumiya Ito, Yuto Suzuki, Hiroaki Takahashi, Hideaki Takizawa and Yuka Tabe

Graphical abstract: Director/barycentric rotation in cholesteric droplets under temperature gradient

The force of impacting rain
Dan Soto, Aurélie Borel De Larivière, Xavier Boutillon, Christophe Clanet and David Quéré

Graphical abstract: The force of impacting rain

These papers are free to access until 2nd July 2014


Self-organizing microfluidic crystals
William E. Uspal and Patrick S. Doyle  

Graphical abstract: Self-organizing microfluidic crystals

Torque density measurements on vortex fluids produced by symmetry-breaking rational magnetic fields
Kyle J. Solis and James E. Martin 

Graphical abstract: Torque density measurements on vortex fluids produced by symmetry-breaking rational magnetic fields
A microscopic view of the yielding transition in concentrated emulsions
E. D. Knowlton, D. J. Pine and L. Cipelletti   

Graphical abstract: A microscopic view of the yielding transition in concentrated emulsions

These papers are free to access until 15th July 2014


Binding of amphiphilic and triphilic block copolymers to lipid model membranes: the role of perfluorinated moieties
Christian Schwieger, Anja Achilles, Sven Scholz, Jan Rüger, Kirsten Bacia, Kay Saalwaechter, Jörg Kressler and Alfred Blume  
Soft Matter, 2014, Advance Article
DOI: 10.1039/C4SM00830H 

Graphical abstract: Binding of amphiphilic and triphilic block copolymers to lipid model membranes: the role of perfluorinated moieties 

Bending elastic properties of a block copolymer-rich lamellar phase doped by a surfactant: a neutron spin-echo study
H. Egger, G. H. Findenegg, O. Holderer, R. Biehl, M. Monkenbusch and T. Hellweg  
Soft Matter, 2014, Advance Article
DOI: 10.1039/C4SM00494A

Graphical abstract: Bending elastic properties of a block copolymer-rich lamellar phase doped by a surfactant: a neutron spin-echo study 

These papers are free to access until 25th July 2014


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Hot articles for May!

A particle based model to simulate microscale morphological changes of plant tissues during drying
H. C. P. Karunasena, W. Senadeera, R. J. Brown and Y. T. Gu

Graphical abstract: A particle based model to simulate microscale morphological changes of plant tissues during drying


Mapping amyloid-β(16-22) nucleation pathways using fluorescence lifetime imaging microscopy
Neil R. Anthony, Anil K. Mehta, David G. Lynn and Keith M. Berland

Graphical abstract: Mapping amyloid-β(16-22) nucleation pathways using fluorescence lifetime imaging microscopy

These papers are free to access until 2nd June 2014


Evolving design rules for the inverse granular packing problem
Marc Z. Miskin and Heinrich M. Jaeger

Graphical abstract: Evolving design rules for the inverse granular packing problem


Ionic effects in self-propelled Pt-coated Janus swimmers
Aidan Brown and Wilson Poon

Graphical abstract: Ionic effects in self-propelled Pt-coated Janus swimmers

These papers are free to access until 16th June 2014


Saddle-splay screening and chiral symmetry breaking in toroidal nematics
Vinzenz Koning, Benjamin C. van Zuiden, Randall D. Kamien and Vincenzo Vitelli

Graphical abstract: Saddle-splay screening and chiral symmetry breaking in toroidal nematics


Emerging bioinspired polymers: glycopolypeptides
Kai-Steffen Krannig and Helmut Schlaad

Graphical abstract: Emerging bioinspired polymers: glycopolypeptides


Analysis of liquid metal foams through X-ray radioscopy and microgravity experiments
F. García-Moreno, S. T. Tobin, M. Mukherjee, C. Jiménez, E. Solórzano, G. S. Vinod Kumar, S. Hutzler and J. Banhart

Graphical abstract: Analysis of liquid metal foams through X-ray radioscopy and microgravity experiments

These papers are free to access until 20th June 2014


Destruction of cancer cells by laser-induced shock waves: recent developments in experimental treatments and multiscale computer simulations
Martin Oliver Steinhauser and Mischa Schmidt  

Graphical abstract: Destruction of cancer cells by laser-induced shock waves: recent developments in experimental treatments and multiscale computer simulations


Strong effect of weak charging in suspensions of anisotropic colloids
Sven Dorosz, Nikhilesh Shegokar, Tanja Schilling and Martin Oettel  

Graphical abstract: Strong effect of weak charging in suspensions of anisotropic colloids

These papers are free to access until 28th June 2014


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Hot articles for April!

Tunable interactions between paramagnetic colloidal particles driven in a modulated ratchet potential
Arthur V. Straube and Pietro Tierno


Phase behavior of Janus colloids determined by sedimentation equilibrium
Daniel J. Beltran-Villegas, Benjamin A. Schultz, Nguyen H. P. Nguyen, Sharon C. Glotzer and Ronald G. Larson

These papers are free to access until 23rd May 2014



The effect of drop volume and micropillar shape on the apparent contact angle of ordered microstructured surfaces
Luciano Afferrante and Giuseppe Carbone


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Hot Articles for March!

 

 


Rheology dynamics of aggregating colloidal suspensions
Mikael Mohtaschemi, Antti Puisto, Xavier Illa and Mikko J. Alava 
 
 

 These papers are free to access until 28th April 2014
 


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February’s Hot Articles!

Ruijuan Wang, Maozhang Tian and Yilin Wang

This paper is free to access until 21st March


Erik Edlund, Oskar Lindgren and Martin Nilsson Jacobi
This paper is free to access until 21st March


Directed colloidal self-assembly in toggled magnetic fields

James W. Swan, Jonathan L. Bauer, Yifei Liu and Eric M. Furst

This paper is free to access until 21st March


(more…)

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