Soft Matter最新文献_第2页

Impact of cross-linking on the time-temperature superposition of creep rupture in epoxy resins. 交联对环氧树脂蠕变断裂时温叠加的影响。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-08 DOI: 10.1039/d4sm01540a

Atsuomi Shundo, Mika Aoki, Satoru Yamamoto, Keiji Tanaka

{"title":"Impact of cross-linking on the time-temperature superposition of creep rupture in epoxy resins.","authors":"Atsuomi Shundo, Mika Aoki, Satoru Yamamoto, Keiji Tanaka","doi":"10.1039/d4sm01540a","DOIUrl":"https://doi.org/10.1039/d4sm01540a","url":null,"abstract":"Epoxy resins are an important class of thermosetting resins, and their network structure, formed by the curing reaction of epoxy and amine compounds, plays a crucial role in determining material properties, including creep behavior. We here applied the time-temperature superposition (TTS) principle to analyze the creep behavior of epoxy resins with well-defined network structures that were systematically varied based on the length of the n-alkyl diamine used. The superposition of isothermal creep curves under small stress was achieved through horizontal and vertical shifting, regardless of the length of the n-alkyl diamine. The temperature dependence of the horizontal shift factor was well described by the Williams-Landel-Ferry equation. Creep rupture measurements under large stress conditions revealed specimen rupture, and the time to rupture was plotted against the imposed stress. These plots, acquired at various temperatures, could be superimposed through horizontal shifting. As the diamine length decreased-namely, the distance between cross-linking points-the temperature dependence of the horizontal shift factors deviated from the WLF equation and exhibited Arrhenius-type behavior. The deviation was associated with differences in the fracture process involving chain scission, which became more pronounced as the diamine length decreased. The insights gained in this study should be valuable for controlling creep response and predicting the long-term durability of epoxy resins.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143802005","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

Designing optimal elastic filaments for viscous propulsion 粘性推进弹性丝的优化设计。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-08 DOI: 10.1039/D4SM01388C

Mariia Dvoriashyna and Eric Lauga

{"title":"Designing optimal elastic filaments for viscous propulsion","authors":"Mariia Dvoriashyna and Eric Lauga","doi":"10.1039/D4SM01388C","DOIUrl":"10.1039/D4SM01388C","url":null,"abstract":"The propulsion of many eukaryotic cells is generated by flagella, flexible slender filaments that are actively oscillating in space and time. The dynamics of these biological appendages have inspired the design of many types of artificial microswimmers. The magnitude of the filament's viscous propulsion depends on the time-varying shape of the filament, and that shape depends in turn on the spatial distribution of the bending rigidity of the filament. In this work, we rigorously determine the relationship between the mechanical (bending) properties of the filament and the viscous thrust it produces using mathematical optimisation. Specifically, by considering a model system (a slender elastic filament with an oscillating slope at its base), we derive the optimal bending rigidity function along the filament that maximises the time-averaged thrust produced by the actuated filament. Instead of prescribing a specific functional form, we use functional optimisation and adjoint-based variational calculus to formally establish the link between the distribution of bending rigidity and propulsion. The optimal rigidities are found to be stiff near the base, and soft near the distal end, with a spatial distribution that depends critically on the constraints used in the optimisation procedure. These findings may guide the optimal design of future artificial swimmers.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 18","pages":" 3503-3514"},"PeriodicalIF":2.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/sm/d4sm01388c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143802003","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

Characterizing semiflexible network structure of wormlike micelles by dynamic techniques† 用动态技术表征蠕虫状胶束的半柔性网络结构。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-08 DOI: 10.1039/D5SM00116A

Hiroki Degaki, Tsuyoshi Koga and Tetsuharu Narita

{"title":"Characterizing semiflexible network structure of wormlike micelles by dynamic techniques†","authors":"Hiroki Degaki, Tsuyoshi Koga and Tetsuharu Narita","doi":"10.1039/D5SM00116A","DOIUrl":"10.1039/D5SM00116A","url":null,"abstract":"Understanding the structure–property relationships of semiflexible polymer networks is essential for their rational design and application across diverse fields. While classical static structural characterizations have been widely used, dynamic investigations also provide a powerful approach to analyzing these networks across multiple hierarchical levels in both time and length scales. This study presents a comprehensive methodology to dynamically determine key structural parameters in semiflexible polymer networks, characterizing time, length, volume, and molecular weight of unit segments at their respective hierarchical levels, such as Kuhn monomers, correlation blobs, and network strands. A wormlike micellar solution of sodium dodecyl sulfate and aluminum nitrate was used as a model system representing semiflexible polymers with a large Kuhn length. By combining dynamic experimental techniques, including dynamic light scattering, macrorheology, and microrheology, crucial structural information was obtained. Integrating information derived from the characteristic parameters successfully revealed the hierarchical network structure of the wormlike micelles, with results validated against static light scattering measurements. Notably, this study effectively utilizes the complex viscoelastic modulus obtained through microrheology, which has received limited attention in the literature. This approach holds potential applicability to a wide range of semiflexible polymer networks.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 17","pages":" 3373-3383"},"PeriodicalIF":2.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801997","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

Tunable assembly of confined Janus microswimmers in sub-kHz AC electric fields under gravity. 重力作用下亚千赫交流电场约束Janus微游泳器的可调谐装配。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-07 DOI: 10.1039/d4sm01511h

Carolina van Baalen, Laura Alvarez, Robert W Style, Lucio Isa

引用次数: 0

Biosurfactant/surfactant mixing properties at the air–water interface: comparing rhamnolipids and sophorolipids mixed with the anionic surfactant sodium dodecyl benzene sulfonate† 生物表面活性剂/表面活性剂在空气-水界面的混合性能：比较鼠李糖脂和槐油脂与阴离子表面活性剂十二烷基苯磺酸钠†的混合

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-07 DOI: 10.1039/D5SM00147A

R. K. Thomas and J. Penfold

{"title":"Biosurfactant/surfactant mixing properties at the air–water interface: comparing rhamnolipids and sophorolipids mixed with the anionic surfactant sodium dodecyl benzene sulfonate†","authors":"R. K. Thomas and J. Penfold","doi":"10.1039/D5SM00147A","DOIUrl":"https://doi.org/10.1039/D5SM00147A","url":null,"abstract":"There is an increasing interest in the use of biosurfactants in the development of more biocompatible and biosustainable surfactant-based products. To optimise performance and mitigate production costs, biosurfactants are commonly mixed with different synthetic surfactants. Understanding in detail their mixing properties at interfaces and in solution is key to the development of optimal formulations. Reported here is a detailed thermodynamic analysis, using the latest developments in the pseudo phase approximation, PPA, of the mixing behaviour at the air–water interface of two glycolipid biosurfactants, rhamnolipids, RL, containing the mono and di-rhamnose isomers R1 and R2, and the sophorolipids, SL, containing the lactonic and acidic isomers LS and AS, with the anionic surfactant sodium dodecyl benzene sulfonate, LAS. The analysis uses the previously reported adsorption data, from neutron reflectivity measurements, NR, for the associated binary and ternary mixtures. The different rhamnolipid and sophorolipid biosurfactant structures and their relative surface activities have a profound effect on their mixing properties at the air–water interface with the anionic surfactant LAS, due predominantly to the steric constraints of the different molecular structures. This results in different synergistic excess free energies of mixing and different optimal compositions.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 18","pages":" 3534-3546"},"PeriodicalIF":2.9,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/sm/d5sm00147a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918829","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

Multiple anisotropy of cellulose nanocrystals self-organized into disc-shaped particles. 纤维素纳米晶体的多重各向异性自组织成圆盘状颗粒。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-07 DOI: 10.1039/d5sm00144g

Emiko Mouri, Kenta Noma, Keito Hirayama, Ryohei Iwahisa, Satsuki Azuma, Teruyuki Nakato

引用次数: 0

The yoga of droplets: coalescence in complex fluids 液滴的瑜伽：复杂流体中的聚合

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-07 DOI: 10.1039/D4SM01128G

Navin Kumar Chandra and Aloke Kumar

引用次数: 0

Toothpicks and toy football players: frictional jamming causes locomotion of vertically-shaken assymetrical objects† 牙签和玩具足球运动员：摩擦干扰导致垂直震动的不对称物体运动†

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-07 DOI: 10.1039/D4SM01408A

Satyanu Bhadra, Shankar Ghosh and Andy Ruina

{"title":"Toothpicks and toy football players: frictional jamming causes locomotion of vertically-shaken assymetrical objects†","authors":"Satyanu Bhadra, Shankar Ghosh and Andy Ruina","doi":"10.1039/D4SM01408A","DOIUrl":"https://doi.org/10.1039/D4SM01408A","url":null,"abstract":"In a vertically shaken vertical round container of loosely packed nominally-vertical toothpicks, the toothpicks gradually progress horizontally. This vibration-driven locomotion is also observed in vintage toy football players on a buzzing support and in modern “Bristlebots” which are toothbrush heads with phone buzzers mounted on top. In all these cases the objects, or their lower parts, have a slant. With experiments, simulations and simple approximate theories we identify the two key features of horizontal locomotion induced by vertical-shaking: (1) the normal-force dependence of Coulomb friction and (2) some, but not too much, rotational freedom of the slanted legs. The small rotational freedom causes the necessary elastic or inertial anisotropy of the slanted objects. On the other hand, the slight restriction on rotation keeps the orientation near this anisotropic state. A key factor is jamming, which tends to occur if the slant of the principal axes of the contact mass or stiffness matrix is less than the friction angle ϕf ≡ arctan(μ), where μ is the friction coefficient.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 18","pages":" 3577-3594"},"PeriodicalIF":2.9,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918833","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

Training allostery-inspired mechanical response in disordered elastic networks 无序弹性网络中训练变构激发的机械响应

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-04 DOI: 10.1039/D4SM01340A

Savannah D. Gowen

引用次数: 0

Compositional versatility enables biologically inspired reverse micelles for study of protein–membrane interactions† 组成的多功能性使生物学启发的反胶束研究蛋白质-膜相互作用†

IF 2.9 3区化学

Soft Matter Pub Date : 2025-04-04 DOI: 10.1039/D5SM00033E

Sara H. Walters, Rachel L. Signorelli, Allyson G. Payne, Alimohammad Hojjatian and Brian Fuglestad

{"title":"Compositional versatility enables biologically inspired reverse micelles for study of protein–membrane interactions†","authors":"Sara H. Walters, Rachel L. Signorelli, Allyson G. Payne, Alimohammad Hojjatian and Brian Fuglestad","doi":"10.1039/D5SM00033E","DOIUrl":"https://doi.org/10.1039/D5SM00033E","url":null,"abstract":"The study of membranes and their associated proteins is critical for understanding cellular processes. In vitro investigations utilizing membrane models often have limitations in their biological relevance due to the dissimilarity of experimentally compatible membrane mimetics to biological membranes. Development of membrane models that better mimic cellular membranes enables more biologically accurate observations of membrane associated proteins. In this work, we present upper tolerance concentrations for a range of lipids incorporated into reverse micelles (RMs), confirmed with dynamic light scattering (DLS). A breadth of lipid incorporation enabled biologically inspired RMs to be formulated based on the molar ratios of lipids present in eukaryotic membrane leaflets. Three systems were formulated matching lipid compositions of the inner leaflet of the plasma membrane (PM-RM), the outer mitochondrial membrane leaflet (MI-RM), and the outer rough endoplasmic reticulum membrane leaflet (ER-RM). The biologically-inspired RM formulations were characterized using DLS and cryo-electron microscopy (cryo-EM) and were found to have favorable properties for protein encapsulation. All three biologically inspired RM formulations effectively encapsulated fatty acid binding protein 4 (FABP4), a protein which shuttles fatty acids between membranes, confirmed by NMR. Also presented in this work is the first known high-resolution observation of the membrane-bound state of sterol carrier protein 2 (SCP2), a protein responsible for transporting an array of lipids between membranes. SCP2 was successfully encapsulated within all three RM systems, enabling NMR observation of the membrane interface of SCP2. The tolerances and formulations reported here allow for tailoring of RMs to mimic specific cellular membranes and will enhance studies of protein interactions with lipids and membranes among other investigations.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" 18","pages":" 3547-3557"},"PeriodicalIF":2.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/sm/d5sm00033e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918830","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