Soft Matter最新文献_第5页

Artificial neurons made of active matter memristors. 由活性物质忆阻器制成的人工神经元。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-03 DOI: 10.1039/d5sm00402k

Jianli Liu, Marco G Mazza, Yunyun Li, Fabio Marchesoni, Sergey Savel'ev

引用次数: 0

Double symmetry breaking in filamentous colloidal tactoids. 丝状胶体粘状体的双重对称性破缺。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-02 DOI: 10.1039/d5sm00236b

Madina Almukambetova, Hamed Almohammadi, Florine Schleiffer, Raffaele Mezzenga

{"title":"Double symmetry breaking in filamentous colloidal tactoids.","authors":"Madina Almukambetova, Hamed Almohammadi, Florine Schleiffer, Raffaele Mezzenga","doi":"10.1039/d5sm00236b","DOIUrl":"https://doi.org/10.1039/d5sm00236b","url":null,"abstract":"Understanding the dynamics of liquid crystalline tactoids under external forces is of great importance due to their potential applications in optics, medical devices, and displays. However, only recently have tactoids started to be studied systematically under external forces, particularly under extensional flow. Here, we subject tactoids to a shear flow field and study their deformation dynamics under varying conditions of shear and time scales. Using amyloids and nanocellulose to form tactoids from model filamentous colloids with opposite sequences of chirality amplification (left-handed mesoscopic → right-handed cholesteric for amyloids; right-handed mesoscopic → left-handed cholesteric for nanocellulose), we show a complex deformation mechanism in their shape and internal structure under shear flow. When tactoids deform perpendicularly to their long axis, a double symmetry breaking occurs in both their contour shape, with the emergence of a kink, and the orientation of their nematic field. We further show that the mesoscopic chirality of the building blocks directs the position of the kink, with the macroscopic tactoid asymmetry being mirrored when inverting the mesoscopic chirality of the constitutive filamentous colloids, e.g., from the left-handed amyloids to the right-handed nanocellulose.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Depletion effect in an active chiral system† 活性手性体系中的耗竭效应。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-30 DOI: 10.1039/D5SM00361J

Bharti Dabra and Harsh Soni

引用次数: 0

Molecular architecture modulates self-assembly and micellar rheology of model ionic surfactant systems† 分子结构调节模型离子表面活性剂体系的自组装和胶束流变。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-30 DOI: 10.1039/D5SM00252D

Stephen L. Flores, Christopher P. Cabry, Hugh Barlow, Joseph Peterson, Joanne L. Cook, Olga Mihailova, Ian P. Stott, Carlos Avendaño and Christopher Hardacre

{"title":"Molecular architecture modulates self-assembly and micellar rheology of model ionic surfactant systems†","authors":"Stephen L. Flores, Christopher P. Cabry, Hugh Barlow, Joseph Peterson, Joanne L. Cook, Olga Mihailova, Ian P. Stott, Carlos Avendaño and Christopher Hardacre","doi":"10.1039/D5SM00252D","DOIUrl":"10.1039/D5SM00252D","url":null,"abstract":"Understanding and predicting the rheology of micellar systems is key in formulation design with wide-reaching implications for the development of products such as shampoos and detergents. In micellar systems comprising ionic surfactants, predictive models are uniquely challenging to construct as a result of the combined effects of salt screening and surfactant polydispersity on micelle self-assembly. In this work, we provide critical insights into how the amphiphilic nature of ionic surfactants controls self-assembly and rheological behaviour. For pure sodium lauryl ether sulphate surfactants, we demonstrate that the properties of micellar solutions can be described from the average properties of the constituent ingredients. Furthermore, we show that there are three distinct viscosity regimes with varying salt concentrations, and that formulation/property relationships can be systematically controlled by three key aspects of the surfactant molecular geometry in relation to micelle self-assembly: (1) the size of the hydrophilic headgroup (degree of ethoxylation), (2) the length of the hydrocarbon tail, and (3) the polydispersity of the surfactant solutions. In systems with multiple headgroup lengths, the salt concentration required to reach peak viscosity depends exclusively on the average number of ethoxy linkers, while the peak viscosity varies with the relative proportions of the surfactant components. The observed Gaussian symmetry in viscosity trends underscores the intricate relationship between molecular structure and macroscopic behaviour in these systems. These findings have implications for improvements in rheological, thermodynamics, molecular, and predictive models and the design and development of novel formulations.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 29","pages":" 5990-5997"},"PeriodicalIF":2.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/sm/d5sm00252d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Splay and bend deformations in cells near corners† 在角落附近的单元格中展开和弯曲变形。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-26 DOI: 10.1039/D5SM00093A

Aniruddh Murali, Prasoon Awasthi, Kirsten Endresen, Arkadiusz Goszczak and Francesca Serra

引用次数: 0

Precise detection of local relaxation of amorphous polymers at low temperatures via O2 diffusion probed by a dual-luminescent imide compound† 用双发光亚胺化合物探测O2扩散在低温下精确检测非晶聚合物的局部弛豫。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-26 DOI: 10.1039/D5SM00394F

Rika Watanabe, Marina Doi, Haonan Liu, Masatoshi Tokita and Shinji Ando

引用次数: 0

E. coli bacterium tumbling in bulk and close to surfaces: a simulation study† 大肠杆菌大量翻滚并靠近表面：模拟研究。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-26 DOI: 10.1039/D5SM00371G

Pierre Martin, Tapan Chandra Adhyapak and Holger Stark

{"title":"E. coli bacterium tumbling in bulk and close to surfaces: a simulation study†","authors":"Pierre Martin, Tapan Chandra Adhyapak and Holger Stark","doi":"10.1039/D5SM00371G","DOIUrl":"10.1039/D5SM00371G","url":null,"abstract":"Motility is fundamental to the survival and proliferation of microorganisms. The E. coli bacterium propels itself using a bundle of rotating helical flagella. If one flagellum reverses its rotational direction, it leaves the bundle, performs a polymorphic transformation, and the bacterium tumbles. The E. coli bacterium is hydrodynamically attracted to surfaces. This prolongs its residence time, while tumbling facilitates surface detachment. We develop a model of E. coli that uses an extended Kirchhoff-rod theory to implement flagellar flexibility as well as different polymorphic conformations and perform hydrodynamic simulations with the method of multi-particle collision dynamics (MPCD). To establish a reference case, we determine the distribution of tumble angles in the bulk fluid. It shows good agreement with experiments, when we always choose the same tumble time. Increasing the hook stiffness, narrows the tumble angle distribution and reduces the flagellar dispersion during tumbling. Close to a bounding surface, the tumble angle distribution is shifted to smaller angles, while flagellar dispersion is reduced. Reorientation within the plane favors the forward direction, which might be an explanation for prolonged run times observed in experiments.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 29","pages":" 5921-5934"},"PeriodicalIF":2.9,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/sm/d5sm00371g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144537508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defect dynamics in dry active nematics by residue calculus for holomorphic functions of nematic director field 用向列指向域全纯函数的残数演算研究干主动向列的缺陷动力学。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-26 DOI: 10.1039/D5SM00201J

Hiroki Miyazako, Hiroyuki Miyoshi and Takaaki Nara

引用次数: 0

Elastic, viscoelastic, dynamic, topological and structural properties of crosslinked SBR through atomistic molecular dynamics simulations† 通过原子分子动力学模拟交联SBR的弹性、粘弹性、动力学、拓扑和结构性质。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-25 DOI: 10.1039/D5SM00126A

Spyros V. Kallivokas, Anthony Chazirakis, Rohit Ghanta, Anastassia Rissanou, Patrycja Polińska, Craig Burkhart, Manolis Doxastakis and Vagelis Harmandaris

{"title":"Elastic, viscoelastic, dynamic, topological and structural properties of crosslinked SBR through atomistic molecular dynamics simulations†","authors":"Spyros V. Kallivokas, Anthony Chazirakis, Rohit Ghanta, Anastassia Rissanou, Patrycja Polińska, Craig Burkhart, Manolis Doxastakis and Vagelis Harmandaris","doi":"10.1039/D5SM00126A","DOIUrl":"10.1039/D5SM00126A","url":null,"abstract":"In this research work, we provide a detailed investigation of the structural and viscoelastic properties of crosslinked styrene butadiene rubber (SBR) networks that are studied using atomistic molecular dynamics simulations. The composition of the system ratio is (styrene/trans/vinyl/cis): (15/33/26/26) by weight and a 4-atom sulfur chain was used as a hardener for the crosslinking process. The main goal of our work is to characterize a fully percolated SBR network, with a crosslinking density of 8%, at the molecular level, structurally, mechanically and topologically and compare its properties with a system with a lower crosslinking density (3%) and the non crosslinked SBR melt. SBR crosslinked systems are generated via a recently proposed crosslinking algorithm. The shear stress relaxation modulus and the mean square displacement (MSD) were calculated for all systems along with structural properties, such as the pair distribution function, angles and dihedral distributions, and statistical distributions of the atoms between the crosslinks, and finally the topology of these networks was investigated according to the number of clusters that are created during the different crosslink densities, the molecular weight fraction of the largest cluster in these networks, and finally the percolation threshold. The results indicate that the higher we crosslink the SBR, the stiffer our final rubber becomes according to the results of the dynamics and rheology. We further probe the dependence of the structural and viscoelastic properties of the SBS rubber on crosslinking density by comparing a fully percolated system with one having lower crosslinking density (3%) and the non crosslinked SBR melt.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 28","pages":" 5743-5751"},"PeriodicalIF":2.9,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Winding up dynamics for matched and unmatched elastic constants in chiral nematic liquid crystals† 手性向列液晶中匹配和不匹配弹性常数的动力学研究。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-06-25 DOI: 10.1039/D5SM00373C

Eric Khoudi Omori, Renato Ferreira de Souza, Rodolfo Teixeira de Souza and Rafael Soares Zola

引用次数: 0