arXiv: Soft Condensed Matter最新文献_第7页

On the properties of methanolic NaCl solution by molecular dynamics simulations 用分子动力学模拟研究甲醇NaCl溶液的性质

arXiv: Soft Condensed Matter Pub Date : 2020-05-01 DOI: 10.5488/CMP.23.23602

M. C. Sanchez, H. Domínguez, O. Pizio

引用次数: 0

Effect of Laponite® on the structure, thermal stability and barrier properties of nanocomposite gelatin films 拉脱石®对纳米复合明胶薄膜结构、热稳定性和阻隔性能的影响

arXiv: Soft Condensed Matter Pub Date : 2020-04-28 DOI: 10.1016/j.fbio.2020.100596

Daniel L'opez-Angulo, A. M. B. Bittante, C. Luciano, German Ayala-Valencia, C. Flaker, M. Djabourov, P. Sobral

引用次数: 27

Microrheological approach for the viscoelastic response of gels 凝胶粘弹性响应的微流变学方法

arXiv: Soft Condensed Matter Pub Date : 2020-04-20 DOI: 10.1122/8.0000034

L. Rizzi

引用次数: 3

Direct evidence of stress-induced chain proximity in a macromolecular complex 大分子络合物中应力诱导链邻近的直接证据

arXiv: Soft Condensed Matter Pub Date : 2020-04-18 DOI: 10.1103/PhysRevMaterials.4.055603

Steven van Kesteren, T. Nikolaeva, H. Van As, J. Dijksman

{"title":"Direct evidence of stress-induced chain proximity in a macromolecular complex","authors":"Steven van Kesteren, T. Nikolaeva, H. Van As, J. Dijksman","doi":"10.1103/PhysRevMaterials.4.055603","DOIUrl":"https://doi.org/10.1103/PhysRevMaterials.4.055603","url":null,"abstract":"The mechanical properties of many supramolecular materials are often determined by non-covalent interactions that arise from an interplay between chemical composition and molecular microstructural organization. The reversible nature of non-covalent interactions gives supramolecular materials responsive properties that are otherwise difficult to obtain, such as becoming rigid as a response to mechanical stress. How exactly non-covalent interactions emerge from microstructure, how they might change in response to applied force or deformation is not understood. Here we combine Nuclear Magnetic Resonance (NMR) and rheology to directly probe the role of chain proximity in polymer complexes. We observe an increase in chain proximity in response to imposed flow, which we hypothesize to originate from enhanced hydrogen bonding. The chain proximity is directly correlated to rod climbing and shear banding. Flow persists only when applied stresses are low, suggesting a stress-induced thickening mechanism. We verify that hydrogen bond disruptors can turn off both the non-trivial flow behavior and the spectroscopic evidence of chain proximity. The combined rheo-NMR approach shows that it is possible to directly observe the molecular origins behind supramolecular mechanics, paving the way for further study into mechano-chemical properties of supramolecular materials.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77234215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A mesoscopic model for the collective dynamics of water coherence domains 水相干域集体动力学的介观模型

arXiv: Soft Condensed Matter Pub Date : 2020-04-16 DOI: 10.13140/RG.2.2.29629.61920

Alessandro Scire

引用次数: 3

Extended micromorphic computational homogenization for mechanical metamaterials exhibiting multiple geometric pattern transformations 具有多重几何图案变换的机械超材料的扩展微形态计算均匀化

arXiv: Soft Condensed Matter Pub Date : 2020-04-10 DOI: 10.1016/j.eml.2020.100708

O. Rokos, M. M. Ameen, R. Peerlings, M. Geers

引用次数: 12

Viscous flow properties and hydrodynamic diameter of phenothiazine-based redox-active molecules in different supporting salt environments 吩噻嗪基氧化还原活性分子在不同支持盐环境下的粘性流动特性和水动力直径

arXiv: Soft Condensed Matter Pub Date : 2020-04-08 DOI: 10.1063/5.0010168

Yilin Wang, A. Kaur, N. Attanayake, Zhou Yu, T. M. Suduwella, Lei Cheng, S. Odom, R. Ewoldt

{"title":"Viscous flow properties and hydrodynamic diameter of phenothiazine-based redox-active molecules in different supporting salt environments","authors":"Yilin Wang, A. Kaur, N. Attanayake, Zhou Yu, T. M. Suduwella, Lei Cheng, S. Odom, R. Ewoldt","doi":"10.1063/5.0010168","DOIUrl":"https://doi.org/10.1063/5.0010168","url":null,"abstract":"We report viscous flow properties of a redox-active organic molecule, N-(2-(2-methoxyethoxy)ethyl)phenothiazine (MEEPT), a candidate for non-aqueous redox flow batteries, and two of its radical cation salts. A microfluidic viscometer enabled the use of small sample volumes in determining viscosity as a function of shear rate and concentration in the non-aqueous solvent, acetonitrile, both with and without supporting salts. All solutions tested show Newtonian behavior over shear rates of up to 30,000 1/s, which is rationalized by scaling arguments for the diffusion-based relaxation time of a single MEEPT molecule without aggregation. Neat MEEPT is flowable but with a large viscosity (412 mPa s) at room temperature), which is approximately 1,000 times larger than acetonitrile. When dissolved in acetonitrile, MEEPT solutions have low viscosities; at concentrations up to 0.5 M, the viscosity increases by less than a factor of two. From concentration-dependent viscosity measurements, molecular information is inferred from intrinsic viscosity (hydrodynamic diameter) and the Huggins coefficient (interactions). Model fit credibility is assessed using the Bayesian Information Criterion (BIC). It is found that the MEEPT and its charged cation are \"flowable\" and do not flocculate at concentrations up to 0.5 M. MEEPT has a hydrodynamic diameter of around 0.85 nm, which is largely insensitive to supporting salt and state of charge. This size is comparable to molecular dimensions of single molecules obtained from optimized structures using density function theory calculations. The results suggest that MEEPT is a promising candidate for redox flow batteries in terms of its viscous flow properties.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89029411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Viscoelastic multiscaling in immersed networks 浸入式网络中的粘弹性多尺度

arXiv: Soft Condensed Matter Pub Date : 2020-04-05 DOI: 10.1103/PHYSREVRESEARCH.2.033222

J. L. B. de Araújo, J. S. de Sousa, W. P. Ferreira, C. L. Oliveira

引用次数: 3

Getting jammed in all directions: Dynamic shear jamming around a cylinder towed through a dense suspension 在各个方向卡住:动态剪切卡住周围的圆柱体拖过一个密集的悬架

arXiv: Soft Condensed Matter Pub Date : 2020-04-03 DOI: 10.1103/PhysRevFluids.6.063301

Olav Rømcke, I. Peters, R. J. Hearst

{"title":"Getting jammed in all directions: Dynamic shear jamming around a cylinder towed through a dense suspension","authors":"Olav Rømcke, I. Peters, R. J. Hearst","doi":"10.1103/PhysRevFluids.6.063301","DOIUrl":"https://doi.org/10.1103/PhysRevFluids.6.063301","url":null,"abstract":"Experimental results are presented from towing a cylinder through a dense suspension of cornstarch and sucrose-water. Focus is placed on the jamming fronts that exist in such systems. The literature has concentrated on the propagation of the jammed region under pushing, pulling or shearing conditions independently. How the different fronts interact and if the fronts are symmetric has remained unexplored. With the current setup, we are able to view a continuous, quasi-2D field around the cylinder. As such, a new way of generating jamming fronts is presented whereby pushing, pulling and shearing can be examined simultaneously. In agreement with previous studies, the front propagates roughly twice as fast in the longitudinal direction compared to the transverse direction, which is attributed to a single underlying onset strain, regardless of orientation from the cylinder. Although the jamming front shows nearly perfect transverse symmetry, there is small but repeatable longitudinal asymmetry. This is clearly evident in the velocity and strain field outside the jammed region, and also detectable in the front propagation and onset strain.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78906414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Viscoelastic properties of ring-linear DNA blends exhibit nonmonotonic dependence on blend composition 环状线性DNA共混物的粘弹性性能与共混物的组成呈非单调关系

arXiv: Soft Condensed Matter Pub Date : 2020-03-31 DOI: 10.1103/PHYSREVRESEARCH.2.023213

K. Peddireddy, Megan Lee, Charles M. Schroeder, R. Robertson-Anderson

{"title":"Viscoelastic properties of ring-linear DNA blends exhibit nonmonotonic dependence on blend composition","authors":"K. Peddireddy, Megan Lee, Charles M. Schroeder, R. Robertson-Anderson","doi":"10.1103/PHYSREVRESEARCH.2.023213","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.023213","url":null,"abstract":"Entangled ring polymers, along with blends of ring and linear polymers, continue to be a topic of great interest and debate due to the conflicting experimental results in the literature as well as the difficulty of producing entangled synthetic rings devoid of linear contaminants. Here, we create blended solutions of entangled ring and linear DNA with varying mass fractions of linear DNA. We use optical tweezers microrheology to measure the linear and nonlinear viscoelastic response of these blends. Our measurements reveal a strong non-monotonic dependence of linear viscoelastic properties on linear DNA fraction, with a pronounced maximum when the mass fraction of rings and linear chains are comparable, suggestive of pervasive threading of rings by linear chains. We observe a similar non-monotonicity in the nonlinear regime; however, a comparatively higher fraction of linear chains (0.5-0.7) is required for a substantial increase in resisitive force and slowing of relaxation dynamics to emerge. This nonlinear response also appears to be rate dependent, which we argue arises from force-induced de-threading of rings at high strain rates. Our results fill a longstanding gap in knowledge regarding the microrheology and nonlinear response of ring-linear polymer blends. Moreover, the uniquely strong mechanical response that ring-linear blends exhibit, along with the ability to finely tune these blends by varying the blend composition, provides new materials design principles.","PeriodicalId":8472,"journal":{"name":"arXiv: Soft Condensed Matter","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90071603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15