- Published on 19 July 2016
Thanks to the ordering effects of two-faced magnetic beads, they can be turned into useful tools controlled by a changing external magnetic field
Janus was a Roman god with two distinct faces. Thousands of years later, he inspired material scientists working on asymmetrical microscopic spheres - with both a magnetic and a non-magnetic half - called Janus particles. Instead of behaving like normal magnetic beads, with opposite poles attracting, Janus particle assemblies look as if poles of the same type attract each other. A new study reveals that the dynamics of such assemblies can be predicted by modelling the interaction of only two particles and simply taking into account their magnetic asymmetry. These findings were recently published in EPJ E by Gabi Steinbach from the Chemnitz University of Technology, Germany, and colleagues at the Helmholtz-Zentrum Dresden-Rossendorf. It is part of a topical issue entitled "Nonequilibrium Collective Dynamics in Condensed and Biological Matter." The observed effects were exploited in a lab-on-a-chip application in which microscopic systems perform tasks in response to a changing external magnetic field.
- Published on 12 July 2016
The EPJE editors are pleased to announce that this year’s edition of the EPJE Pierre-Gilles de Gennes Lecture Prize goes to German physicist Regine von Klitzing. Von Klitzing was nominated for her important contributions to polymer physics, particularly concerning the structure of polyelectrolyte assemblies and functionalized/responsive microgels. The EPJE Pierre-Gilles de Gennes lecture will be delivered by von Klitzing in Grenoble, France, during the 4th International Soft Matter Conference which takes place from 12 to 16 September 2016.
- Published on 23 June 2016
Daan Frenkel has been awarded the most important prize in the field of statistical mechanics, the 2016 Boltzmann Medal. The award recognises Frenkel’s seminal contributions to the statistical-mechanical understanding of the kinetics, self-assembly and phase behaviour of soft matter. The honour recognises Frenkel’s highly creative large-scale simulations of soft matter capable of explaining the self-assembly of complex macromolecular systems, colloidal and biomolecular systems.
Frenkel is Professor of Theoretical Chemistry at the University of Cambridge, UK and has been Editor in Chief of EPJ E between 2010 and 2014. In this interview with Sabine Louet, Frenkel gives his views on statistical physics, which has become more relevant than ever for interdisciplinary research. He also offers some pearls of wisdom for the next generation Statistical Mechanics experts. The full interview is published in the June issue of EPJE.
EPJ E interview – Yves Pomeau. The universality of statistical physics interpretation is ever more obvious
- Published on 23 June 2016
During the StatPhys Conference on 20th July 2016 in Lyon, France, Yves Pomeau and Daan Frenkel will be awarded the most important prize in the field of Statistical Mechanics: the 2016 Boltzmann Medal. The award recognizes Pomeau’s key contributions to the Statistical Physics of non-equilibrium phenomena in general. And, in particular, for developing our modern understanding of fluid mechanics, instabilities, pattern formation and chaos.
Pomeau, who is an Editor for the European Physical Journal Special Topics, is recognised as an outstanding theorist bridging disciplines from applied mathematics to statistical physics with a profound impact on the neighbouring fields of turbulence and mechanics. In an interview with Sabine Louet, published in EPJ E, Pomeau shares his views and tells how he experienced the rise of Statistical Mechanics in the past few decades. He also touches upon the need to provide funding to people who have the rare ability to discover new things and ideas, and not just those who are good at filling in grant application forms. The full interview is published in the June issue of EPJE.
- Published on 14 June 2016
New high-throughput method to produce both liposomes and polymersomes on the same microfluidic chip
Synthetic biology involves creating artificial replica that mimic the building blocks of living systems. It aims at recreating biological phenomena in the laboratory following a bottom-up approach. Today scientists routinely create micro-compartments, so called vesicles, such as liposomes and polymersomes. Their membranes can host biochemical processes and are made of self-assembled lipids or a particular type of polymers, called block copolymers, respectively. In a new study, researchers have developed a high-throughput method--based on an approach known as microfluidics--for creating stable vesicles of controlled size. The method is novel in that it works for both liposomes and polymersomes, without having to change the design of the microfluidic device or the combination of liquids. Julien Petit from the Max Planck Institute for Dynamics and Self-Organisation (MPIDS) in Göttingen, Germany and colleagues recently published these findings in EPJ E.
- Published on 30 May 2016
In this EPJ E Review, Toor, Feng and Russel present many examples of self-assembly of nanoscale materials (both synthetic and biological) such as nanoparticles, nanorods and nanosheets at liquid/liquid interfaces. For biological nanoparticles, the nanoparticle assembly at fluid interfaces provide a simple route for directing nanoparticles into 2-D or 3-D constructs with hierarchical ordering.
- Published on 18 May 2016
New method for selectively controlling the motion of multiple sized microspheres suspended in water
As our technology downsizes, scientists often operate in microscopic-scale jungles, where modern-day explorers develop new methods for transporting microscopic objects of different sizes across non uniform environments, without losing them. Now, Pietro Tierno and Arthur Straube from the University of Barcelona, Spain, have developed a new method for selectively controlling, via a change in magnetic field, the aggregation or disaggregation of magnetically interacting particles of two distinct sizes in suspension in a liquid. Previous studies only focused on one particle size. These results, just published in EPJ E, show that it is possible to build long chains of large particles suspended in a liquid, forming channels that drive the small particles to move along. This could be helpful, for example, when sorting magnetic beads by size, separating biological or chemical entities in lab-on-a-chip devices or transporting biological species to analyse them.
- Published on 11 April 2016
New model shows how collective transport by synthetic nanomotors along biopolymer filaments can be effectively directed
Ever wondered how a molecular nanomotor works when repairing DNA or transporting material such as organelles in the cell? Typically, nanomotors move along biopolymer filaments to go about their duties in the cell. To do so, they use the energy of chemical reactions derived from their surroundings to propel themselves. In a new study published in EPJ E, Mu-Jie Huang and Raymond Kapral from the University of Toronto in Ontario, Canada show that small synthetic motors can attach to polymeric filaments and - unlike what previous studies showed - move along without changing either their shape or the direction in which they set out to move. This makes it possible to effectively deliver the substances they transport, such as anti-cancer drugs or anti-pollutants.
- Published on 24 March 2016
We congratulate Professor Pawel Pieranski of the Laboratoire de Physique des Solides, Université Paris-Sud, who has been awarded the Prix Félix Robin* 2015 by the French Physical Society.
Today, 24 April, Pieranski will receive the prize from the president of the French CNRS Alain Fuchs during the award ceremony that will take place at the Palais de la Découverte in Paris. During the event Pieranski will give a presentation entitled “La beauté universelle des cristaux liquides” that will bring into focus the peculiarities of liquid crystals and how these materials challenge our understanding of the states of matter.
*The Prix Félix Robin 2015 is one of the 6 grand awards of the Société Française de Physique and the one with the longest tradition - it was instituted in 1922.
- Published on 03 March 2016
New factors influencing particle deposition via solvent evaporation and relevant to microchips manufacturing have now been elucidated
Few of us pay attention to the minutiae of coffee stains’ deposition patterns. However, physicists have previously explained the increased deposition of ground coffee particles near the edge of an evaporating droplet of liquid. They attributed it to the collective dynamics of ground coffee grains as the liquid evaporates along the contact line between the liquid coffee and the table. This kind of dynamics also governs microchip production, when particles are deposited on a substrate by means of solvent evaporation. However, until recently, explanations of how such evaporation patterns are formed did not account for the effect of the mutual interactions between electrically charged particles. Now, Diego Noguera-Marín from the University of Granada, Spain, and colleagues have found that particle deposition may be controlled by the interplay between the evaporation of the solvent via convection and the previously identified collective diffusion of suspension nanoparticles. These findings appear as part of an EPJ E topical issue, entitled Wetting and Drying: Physics and Pattern Formation.