The dynamic clustering of charged particles in solution is a ubiquitous, but poorly understood, phenomenon that underpins many biological processes. , Flory-Huggins parameter, from binary mixtures of Lennard-Jones particles to block copolymer melts Chremos, Alexandros, ISSN: 0021-9606, 1089-7690. Very good agreement between simulation and theory is demonstrated. C, S and Jack Douglas Materials Science and Engineering Division, NIST, Gaithersburg, MD, U.S.A. Finally, the equation of state is determined and compared with the prediction from a scaled-particle theory. The assortativity of the network is measured and is found to be positive, meaning that vertices of equal degree are connected more often than in a random network. Entdecken Sie Hergé Tintin et les Picaros Circa 1980 Affiche Originale Bande Dessinée Mexique in der großen Auswahl bei eBay. A power-law decay of the network degree distribution is one of the characteristics of a scale-free network. This is consistent with the simple idea that for large disks, the number of neighbors is proportional to the disk diameter. Comparisons with the predictions of a maximum-entropy theory suggest that this apparent power-law behavior is not the asymptotic one and that p k ∼ k − 4 in the limit k → ∞. Alexandros Chremos 1, Ferenc Horkay 1 Affiliation 1 Section on Quantitative Imaging and Tissue Sciences, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA. At packing fractions in the range 0.24 ≤ η ≤ 0.36, the decay of the network degree distribution is observed to be consistent with the power law k − γ where the exponent lies in the range 5.6 ≤ γ ≤ 6.0. Graphs are constructed from vertices (disks) with edges (links) connecting each vertex to k neighboring vertices defined by a radical tessellation. Overall, our approach provides a guideline for the development of a more predictive theory of the properties of the thermodynamic and transport properties of these complex fluids.The neighbor network in a two-dimensional polydisperse hard-disk fluid with diameter distribution p ( σ ) ∼ σ − 4 is examined using constant-pressure Monte Carlo simulations.
#Alexandros chremos series#
These findings are also closely related to relative simple case of electrolyte solutions, where the strength of solvent interaction with ionic species dictates the location of the ion along the Hofmeister series and modulating the solution properties of these solutions such as viscosity, density, and surface tension. Our findings demonstrate that the solvent is responsible for heterogeneous structure formation in salt-free polyelectrolyte solutions, revealing the essential role of the solvent interactions with the charged species in the description of the polyelectrolyte solutions. To probe this effect, we perform molecular dynamics simulations based on a coarse-grained model of polyelectrolyte solutions with an explicit solvent. This effect has significant implications for the function of proteins and other natural occurring polyelectrolytes (e.g., DNA), as emphasized long ago by Kirkwood and coworkers. There has been significant interest in the tendency of highly charged particles having the same charge to form dynamic clusters in solution, but an accepted.
The theoretical difficulties are especially great for flexible polyelectrolytes due to the additional complex coupling between the polyelectrolyte chain configurations and a diffuse 'polarizable' cloud of counter-ions around these polymers. While, it is widely appreciated that highly charged particles having the same charge to form dynamic clusters in solution, an accepted theoretical framework which accounts for this ubiquitous phenomenon, has been slow to develop. Most polymers encountered in living systems are polyelectrolytes because of their solubility in water, and this broad class of polymers is also ubiquitous in commercial materials in which water solubility is required examples include hydrogels in diapers and gene delivery, thickeners in food industries, drug delivery, water purification agents, and cosmetics. Title: Solvation effects in (poly)electrolyte solutions Alexandros Chremos,1,a) Emmanouil Glynos, 2and Peter F. ChBE Seminar Series: Alexandros Chremos, NISTĪmy Alexandros Chremos, Postdoctoral Researcher at NIST
0 kommentar(er)
