Hot Article: Alpha-Helix Unfolding in Simple Shear Flow

Graphical abstract: α-Helix unfolding in simple shear flowProtein unfolding can lead to aggregation and is linked to protein conformational disorders. In order to learn more about the effect of hydrodynamic forces on protein unfolding Dave Dunstan and co-workers at University of South Australia and The University of Melbourne, Australia, have studied the unfolding of polypeptide helices under shear flow using real-time circular dichroism.

The extent of unfolding is dependent on the monomer size of the poly-L-lysine chains, as well as shear rate and the duration of its application. The shear-stability of the α-helical poly-L-lysine structure increased with increasing chain-length.

Interested to know more? Read the full article for free here:

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Reviews on materials for tissue engineering and regenerative medicine

Soft Matter and Journal of Materials Chemistry have recently published a series of review articles as part of the joint themed issue  on materials for tissue engineering and regenerative medicine. We’ve brought these articles together as they collectively make a great overview of this important and evolving area.

The full issues for Soft Matter and Journal of Materials Chemistry include the original research articles. We hope you’ll enjoy reading them. 

Outside front cover for Journal of Materials Chemistry issue 40, 2010Outside front cover for Soft Matter issue 20, 2010

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Christos Likos joins the Soft Matter Editorial Board

We are delighted to welcome Christos Likos to the Soft Matter Editorial Board. Christos Likos is Professor of Multiscale Computational Physics at the Faculty Physics, University of Vienna, Austria.

Head and shoulders photograph of Christos Likos

Christos’ current research interests include theoretical and computational physics of soft condensed matter. In particular the Likos group focuses on coarse-graining, structure and dynamics of complex fluids, solutions of colloidal particles and macromolecular aggregates.

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Have you read the joint Soft Matter and Journal of Materials Chemistry themed issue on tissue engineering?

Outside front cover for Soft Matter issue 20 Soft Matter issue 20 was part of a themed on tissue engineering. The guest editors for this issue were Molly M. Stevens and Ali Khademhosseini. You can read their editorial here. In it they discuss emerging materials for tissue engineering and regenerative medicine.

The paper featured on the outside front cover was ‘Fibronectin-mimetic peptide-amphiphile nanofiber gels support increased cell adhesion and promote ECM production by Efrosini Kokkoli and co-workers at University of Minnesota, Minneapolis, USA.

Inside front cover for Soft Matter issue 20The inside front cover featured Guiding endothelial progenitor cell tube formation using patterned fibronectin surfaces by Sharon Gerecht and co-workers at Johns Hopkins University, USA.

The papers published in Journal of Materials Chemistry (Issue 40, 2010) as part of the joint themed issue are available here.

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Shape memory polymers get graded

A polymer that changes shape in response to a variety of temperatures could be used in a wide range of applications from temperature sensors to weather-responsive public art scientists claim.

Indents viewed using polar optical microscopy disappear on heating

Indents viewed using polar optical microscopy disappear on heating

Polymers that return to a previous conformation after stimulation are called shape memory polymers. Normally they have one critical temperature where the shape change begins and a different shape memory polymer is needed get responses at different temperatures. Now a team led by Patrick Mather at Syracuse University in the US has overcome this problem. ‘You can use one material with one base formulation’ says Mather. ‘It’s the first time that someone’s graded the response of a shape memory polymer.’

To view the full Highlights in Chemical Technology article, please click here: Shape memory polymers get graded

Link to journal article

A functionally graded shape memory polymer
Andrew M. DiOrio, Xiaofan Luo, Kyung Min Lee and Patrick T. Mather, Soft Matter, 2010
DOI:
10.1039/c0sm00487a

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Top Ten most-read Soft Matter articles

The latest top ten most downloaded Soft Matter articles

See the most-read papers of August 2010 here:

Yuhan Lee, Hyun Jung Chung, Sangho Yeo, Cheol-Hee Ahn, Haeshin Lee, Phillip B. Messersmith and Tae Gwan Park, Soft Matter, 2010, 6, 977-983
DOI: 10.1039/B919944F
 
Paul Roach, Neil J. Shirtcliffe and Michael I. Newton, Soft Matter, 2008, 4, 224-240
DOI: 10.1039/B712575P
 
Li Liu, Wei Wang, Xiao-Jie Ju, Rui Xie and Liang-Yin Chu, Soft Matter, 2010, 6, 3759-3763
DOI: 10.1039/C002231D
 
Dave J. Adams and Paul D. Topham, Soft Matter, 2010, 6, 3707-3721
DOI: 10.1039/C000813C
 
Fu-Sheng Du, Yang Wang, Rui Zhang and Zi-Chen Li, Soft Matter, 2010, 6, 835-848
DOI: 10.1039/B915020J
 
Jan Genzer and Jan Groenewold, Soft Matter, 2006, 2, 310-323
DOI: 10.1039/B516741H
 
Myoung-Woon Moon, Tae-Gon Cha, Kwang-Ryeol Lee, Ashkan Vaziri and Ho-Young Kim, Soft Matter, 2010, 6, 3924-3929
DOI: 10.1039/C0SM00126K
 
A. Serghei, D. Chen, D. H. Lee and T. P. Russell, Soft Matter, 2010, 6, 1111-1113
DOI: 10.1039/B921757F
 
Franziska Gröhn, Soft Matter, 2010, 6, 4296-4302
DOI: 10.1039/C0SM00411A
 
Martin Malmsten, Soft Matter, 2006, 2, 760-769
DOI: 10.1039/B608348J
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Hot Article: Suction of hydrosoluble polymers into nanopores

A team led by Hervé Duval at Ecole Centrale Paris, France, has reported the forced penetration of large hydrosoluble polymer chains through pores in a membrane.

Graphical abstract: Suction of hydrosoluble polymers into nanopores

The team measured the rejection coefficient Robs from retentate and permeate mean concentrations, and its corrected value R including polymer accumulation at the membrane. The variations of R as a function of solvent flow rate per pore in adimensional units collapse into the same curve well fitted by de Gennes’ “suction model”. This curve, universal for flexible polymers in good solvents, leads to an estimate of the critical penetration flow.

Interested to know more? Read the full article here:

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Hot Article: The characterisation of polygalacturonic acid-based layer-by-layer deposited films using a quartz crystal microbalance with dissipation monitoring, a dual polarization interferometer and a Fourier-transform infrared spectrometer in attenuated total reflectance mode

Scientists at the Institute of Food Research, Norwich, UK, examined the growth of polymer mass of polygalacturonic acid-based multilayers using a range of acoustic and optical techniques.

Graphical abstract: The characterisation of polygalacturonic acid-based layer-by-layer deposited films using a quartz crystal microbalance with dissipation monitoring, a dual polarization interferometer and a Fourier-transform infrared spectrometer in attenuated total reflectance mode

The comparative study showed that the different techniques give quantitatively different results when used to measure what is nominally the same quantity (multilayer hydrated mass and polymer mass).

Interested to know more? Read the full article here: Marta Westwood, Timothy R. Noel and Roger Parker, Soft Matter, 2010, DOI:10.1039/C0SM00331J

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Announcing the themed issue on the Dynamics and Rheology of Fluid Interfaces

We are delighted to announce a high-profile themed issue on the Dynamics and Rheology of Fluid Interfaces to be published in 2011. Professor Gerald Fuller (Stanford University, USA) and Professor Jan Vermant (K.U. Leuven, Belgium) are the Guest Editors and it is our pleasure to invite you to submit to this themed issue.

Now in its sixth year of publication, Soft Matter has quickly been established as the platform where biologists, colloid scientists, physicists, polymer scientists, chemical engineers, chemists, and materials scientists can present work for interdisciplinary inspiration. We have published several themed issues on other important emerging topics in recent years, and it now seems particularly timely to publish a focused set of articles covering the Dynamics and Rheology of Fluid Interfaces. The key aim is to highlight the most important areas and directions in this field within a high quality and high impact issue.

The deadline for the receipt of manuscripts for this themed issue is 15th February 2011.

Submissions, either communications or full papers, should be high-quality manuscripts of original, unpublished research, containing important new insight. All submissions will be subject to rigorous peer review to meet the usual high standards of Soft Matter. Accepted manuscripts will be shown to the Guest Editors to ensure they are suitable for the scope of the theme issue.

Manuscripts can be submitted using our online submission service. Please state in your covering letter that your article was submitted in response to the Call for Papers for the themed issue on the Dynamics and Rheology of Fluid Interfaces.

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Hot Article: Dynamics of a deformable self-propelled particle in three dimensions

Japanese scientists at Kyoto University have studied the dynamics of a self-propelled particle in three dimensions by solving the time-evolution equations for the center of mass and a tensor variable characterizing deformations around a sphere.

Graphical abstract: Dynamics of a deformable self-propelled particle in three dimensions 

There are successive bifurcations in the dynamics caused by changing the parameters. A straight motion becomes unstable and a rotating motion on a plane appears. After this rotating motion becomes unstable, a helical motion occurs. A linear stability analysis of these solutions is carried out to determine the bifurcation thresholds, which is in a good agreement with the numerical results.

Read the full paper: Tetsuya Hiraiwa, Kyohei Shitara and Takao Ohta, Soft Matter, 2011, DOI:10.1039/C0SM00856G

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