2019 Impact factor 4.389
Particles and Fields

EPJ E Highlight - Gap geometry grasped

Illustration of the sphere packing in two dimensions. © M. Maiti et al.

A new algorithm could help understand the structure of liquids, and how they flow through porous media

Theoretical physicist Moumita Maiti and colleagues at the Jawaharlal Nehru Centre for Advanced Scientific Research in Bangalore, India, have now implemented an algorithm for analysing void space in sphere packing, where the spheres need not all be the same size. This method, just published in EPJ E, could be applied to analyse the geometry of liquids present between multi-sized spheres that are akin to a model for porous material. This provides a tool for studying the flow of such fluids through porous material. More importantly, it can also be used to study the packing geometry of proteins.


EPJ E Highlight - Liquid crystal’s chaotic inner dynamics

Numerically obtained projection of the trajectory of liquid crystal molecules. © W. Jeżewski et al.

Scientists have unearthed a new dynamic process induced by strong electric fields in thin liquid crystal cells

Liquid crystal displays are ubiquitous. Now, Polish physicists have demonstrated that the application of a very strong alternating electric field to thin liquid crystal cells leads to a new distinct dynamic effect in the response of the cells. The theory of spatio-temporal chaos explains this effect. It was elucidated by Wojciech Jeżewski and colleagues from the Institute of Molecular Physics, Polish Academy of Sciences, in Poznań, Poland, and was just published in EPJ E. This effect has implications for the operation of liquid-crystal devices because their operation is based on the electro-optic switching phenomenon, subject to the newly discovered effect.


EPJ E Highlight - Adhesion disturbed by noise

Schematic illustrations of the pining and de-pinning events of the fibrils in contact with a rigid sphere. © M. K. Chaudhury and P. S. Goohpattader

A new model could ultimately help robotic fingers, made of a soft surface, manipulate small objects

Imagine a solid ball rolling down a slightly inclined ramp. What could be perceived as child’s play is the focus of serious theoretical research by Manoj Chaudhury and Partho Goohpattader, two physicists from Lehigh University, Bethlehem, Pensylvania, USA. Their study, which has just been published in EPJ E, has one thing in common with childhood behaviour. It introduces a mischievous idea, namely studying the effect of random noise, such as vibrations, on the ball. They found it could lower the energy barrier to set the ball in motion.


EPJ E Colloquium - Hidden order in the liquid phase

A snapshot of 2D spin liquid in a supercooled state. (Fig. 3 from the paper)

A two-order parameter model proposed to describe water-like anomalies, liquid-liquid transition, glass transition, crystal nucleation and quasicrystal formation within the same framework.

The liquid state of matter is far from being a perfectly disordered homogeneous state. In a Colloquium paper published in EPJ E, Hajime Tanaka argues that to achieve a better understanding of liquids, it is crucial to recognize that a liquid has a general tendency to exhibit local structural order, and that this order is intrinsic and universal to any liquid. In other words, there is a need for a new order parameter describing a low local free-energy configuration (this is a bond-orientational order parameter in many cases), in addition to a density order parameter.


EPJ E Highlight - Enigmatic Nematics

Ordered macroscopic states of active particles. © A. Baskaran, M. C. Marchetti

The law of hydrodynamics governing the way internally driven systems behave could explain their complex structure

Physicists use hydrodynamics to understand the physical mechanism responsible for changes in the long-range order of groups of particles. Particularly, Aparna Baskaran of Brandeis University, Massachusetts, USA, and Cristina Marchetti of Syracuse University, New York, USA, focused on ordered groups of elongated self-propelled particles. They studied the breakdown of long-range order due to fluctuations that render them unstable and give rise to complex structures, in a study just published in EPJ E within the topical issue on Active Matter.


EPJ E Highlight - DNA’s double stranded stretch

Understanding how DNA and proteins interact could come from a better grasp of DNA’s behaviour once stretched. © Svilen Milev

Models simulate what happens to DNA strands when stretched to the breaking point

Theoretical physicists like to play with very unconventional toys. Manoel Manghi from Toulouse University in France and his colleagues have adopted a seemingly playful approach to examining what happens to a double stranded molecule of DNA when it is stretched to the breaking point, in a study about to be published in EPJ E. Instead of using optical tweezers to stretch DNA as previously done in experimental settings, the authors focused on using a theoretical model to account for the structural deformations of DNA and determine how its mechanical characteristics could explain certain biological processes.


EPJ E Highlight - The hidden threat posed by inconspicuous stripes

Stripy patterns observed during the processing of medicinal powder. © N. Nirmal Thyagu

Physicists investigate the cause of striped patterns formed by fine particles deposited on surfaces

Patterns fascinate. Particularly stripes. Found in nature in zebras, they are also found in the most unlikely places, such as powdered drugs’ mixing vessel walls. In an article just published in EPJ E, Nirmal Thyagu and his colleagues from Rutgers University, New Jersey, USA, propose a traffic model to predict the formation of different patterns, ranging from stripes to spots.


EPJ E Highlight - Scaling up polymer blobs


Several new simulations performed on polymers outline their scaling-up behaviour at extreme limits where it depends on their density and length.

Scientists use simulations to test the limits of their object of study—in this case thin films of polymers—to extremes of scale. In a study just published in EPJ E, Nava Schulmann, a researcher at Strasbourg University, France, and colleagues use a well-known model capable of providing information on heat and mechanical energy exchange between these polymer chains. They found that polymer blends confined to ultrathin two-dimensional films displayed enhanced compatibility. This was made possible by simulations using a fairly standard model, which is simple enough to allow the efficient computation of dense large-chain systems.


EPJ E Highlight - Self-forming biological scaffolding


A model system that can interpret the role of cross-linking proteins.

A new model system of the cellular skeletons of living cells is akin to a mini-laboratory designed to explore how the cells’ functional structures assemble. A paper just published in EPJ E by physicist Volker Schaller and his colleagues from the Technical University Munich, Germany, presents one hypothesis concerning self-organisation. It hinges on the findings that a homogeneous protein network, once subjected to stresses generated by molecular motors, compacts into highly condensed fibres.


EPJ E Colloquium – From shear banding to elastic turbulence


A new model provides an alternative description of atomic level gold bonding.

While simple Newtonian liquids are structured at the molecular scale, complex fluids are structured at the mesoscopic scale. Shear-banding is a ubiquitous phenomenon in complex fluids. It relates to the formation of regions (bands) with different fluidities and stacked along the velocity gradient direction. Shear banding is a transition towards a heterogeneous state induced by the flow itself. It’s been observed in many systems of practical relevance, including giant (wormlike) micelles, telechelic polymers, emulsions, clay suspensions, colloidal gels, star polymers, granular materials, or foams. Giant micelles, the subject of a recent EPJE Colloquium,


L. Baudis, G. Dissertori, K. Skenderis and D. Zeppenfeld

Deputy Editors-in-Chief
D. J. Schwarz

We especially appreciate the reviewer's patience and many helpful suggestions.

Zhang-Yu Nie

ISSN: 1434-6044 (Print Edition)
ISSN: 1434-6052 (Electronic Edition)

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