Soft Matter最新文献_第3页

Binary mixtures of active Brownian particles with distinct nonzero activities. 具有明显非零活度的活性布朗粒子的二元混合物。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-17 DOI: 10.1039/d4sm01290a

Nicholas J Lauersdorf, Ehssan Nazockdast, Daphne Klotsa

引用次数: 0

Materials science underpinnings of micro and nanoplastics. 微和纳米塑料的材料科学基础。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-16 DOI: 10.1039/d5sm00297d

Maninderjeet Singh, Nicholas F Mendez, Michele Valsecchi, Guruswamy Kumaraswamy, Sanat K Kumar

{"title":"Materials science underpinnings of micro and nanoplastics.","authors":"Maninderjeet Singh, Nicholas F Mendez, Michele Valsecchi, Guruswamy Kumaraswamy, Sanat K Kumar","doi":"10.1039/d5sm00297d","DOIUrl":"https://doi.org/10.1039/d5sm00297d","url":null,"abstract":"There is considerable interest in microplastics and nanoplastics (MNPL) due to their ubiquity and their potential for serious health consequences. A framework that allows us to consider all relevant aspects of MNPL requires us to enunciate (a) their formation mechanisms, their sizes, shapes, and chemical functionalities (upstream properties); and (b) their health and environmental consequences (downstream properties). In this perspective, we discuss the materials science underpinnings of MNPL formation, and the current open questions that need immediate attention from the research community. Specifically, we highlight the lack of understanding of how angstrom-level environmentally triggered bond-breaking events lead to the formation of ∼10 nm-1 mm-sized fragments. Are there universal theoretical ideas that unify MNPL formation in disparate situations? What is the role of external stressors, polymer morphology, and molecular weight? Answering these questions requires us to develop a suite of novel metrologies - from accurate, accelerated aging tests that mimic natural MNPL creation processes but speed up these rare events into the normal laboratory time scales; to the extension of standard physicochemical characterization tools which are hard to apply in the context of MNPL formation due to small sample masses.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641294","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

Poly(acrylic acid)-catalyzed supramolecular self-assembly enables free-standing low-molecular-weight hydrogels. 聚丙烯酸催化的超分子自组装使独立的低分子量水凝胶成为可能。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-16 DOI: 10.1039/d5sm00468c

Samahir Sheikh Idris, Hucheng Wang, Yuliang Gao, Peiwen Cai, Yiming Wang, Kangkang Zhi, Shicheng Zhao

{"title":"Poly(acrylic acid)-catalyzed supramolecular self-assembly enables free-standing low-molecular-weight hydrogels.","authors":"Samahir Sheikh Idris, Hucheng Wang, Yuliang Gao, Peiwen Cai, Yiming Wang, Kangkang Zhi, Shicheng Zhao","doi":"10.1039/d5sm00468c","DOIUrl":"https://doi.org/10.1039/d5sm00468c","url":null,"abstract":"Supramolecular hydrogels self-assembled by low-molecular-weight gelators through non-covalent interactions present potent application potential in fields ranging from biomedicine to energy. However, the underwhelming mechanical properties dramatically limit real-life applications. In this contribution, we report our access to free-standing supramolecular hydrogels by triggered self-assembly of gelators using polyacrylic acid (PAA) as a catalyst. This is achieved using a hydrazone formation-induced self-assembly system, where the formation and self-assembly of hydrazone-based gelators can be dramatically accelerated under the catalysis of acid. The addition of PAA dramatically accelerates the hydrogelation process, resulting in hydrogels exhibiting well-defined networks and high stiffness. Under optimal conditions, the stiffness can even reach 37.5 kPa compared to only 2.9 kPa for the pure hydrogel. Furthermore, we find that the resultant hydrogels can stand freely and can be remolded in various shapes. Our study presents a simple approach towards strong supramolecular hydrogels that can retain their shape and size while maintaining the functionalities and stability, accelerating the applications of supramolecular hydrogels in the field of, for instance, biosensors, tissue engineering, and drug delivery.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641295","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

Cornerstones are the key stones: using interpretable machine learning to probe the clogging process in 2D granular hoppers. 基石是关键的基石：使用可解释的机器学习来探测二维颗粒漏斗中的堵塞过程。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-16 DOI: 10.1039/d5sm00367a

Jesse M Hanlan, Sam Dillavou, Andrea J Liu, Douglas J Durian

{"title":"Cornerstones are the key stones: using interpretable machine learning to probe the clogging process in 2D granular hoppers.","authors":"Jesse M Hanlan, Sam Dillavou, Andrea J Liu, Douglas J Durian","doi":"10.1039/d5sm00367a","DOIUrl":"https://doi.org/10.1039/d5sm00367a","url":null,"abstract":"The sudden arrest of flow by formation of a stable arch over an outlet is a unique and characteristic feature of granular materials. Previous work suggests that grains near the outlet randomly sample configurational flow microstates until a clog-causing flow microstate is reached. However, factors that lead to clogging remain elusive. Here we experimentally observe over 50 000 clogging events for a tridisperse mixture of quasi-2D circular grains, and utilize a variety of machine learning (ML) methods to search for predictive signatures of clogging microstates. This approach fares just modestly better than chance. Nevertheless, our analysis using linear Support Vector Machines (SVMs) highlights the position of potential arch cornerstones as a key factor in clogging likelihood. We verify this experimentally by varying the position of a fixed (cornerstone) grain, which we show non-monotonically alters the average time and mass of each flow by dictating the size of feasible flow-ending arches. Positioning this grain correctly can even increase the ejected mass by 70%. Our findings suggest a bottom-up arch formation process, and demonstrate that interpretable ML algorithms like SVMs, paired with experiments, can uncover meaningful physics even when their predictive power is below the standards of conventional ML practice.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641293","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

Shear-induced assembly and breakup in suspensions of magnetic Janus particles with laterally shifted dipoles. 具有横向移动偶极子的磁性Janus粒子悬浮液中的剪切诱导组装和破裂。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-16 DOI: 10.1039/d5sm00457h

Joysy R Tafur-Ushiñahua, Ronal A DeLaCruz-Araujo, Ubaldo M Córdova-Figueroa

{"title":"Shear-induced assembly and breakup in suspensions of magnetic Janus particles with laterally shifted dipoles.","authors":"Joysy R Tafur-Ushiñahua, Ronal A DeLaCruz-Araujo, Ubaldo M Córdova-Figueroa","doi":"10.1039/d5sm00457h","DOIUrl":"10.1039/d5sm00457h","url":null,"abstract":"We employ Brownian dynamics simulations to investigate the shear-induced assembly and breakup of aggregates in dilute suspensions of magnetic Janus particles with laterally shifted dipoles. By systematically displacing the magnetic dipole from its geometric center, given by the dipolar shift s, and the strength of magnetic interactions relative to flow- and Brownian-induced forces, given by the Péclet number Pe and the dipolar coupling constant λ, respectively, distinct aggregation regimes are revealed. At low dipolar shifts (s ≤ 0.1) and low Pe, shear-enhanced diffusion promotes particle collisions, leading to faster aggregation of particles forming loop-like clusters that align with the flow. As Pe increases, these structures fragment into smaller aggregates and eventually disperse into gas-like arrangements. In contrast, particles with medium dipolar shifts (s ≥ 0.2) exhibit significant stability, forming compact vesicle- and micelle-like assemblies that resist shear-induced breakup even at high Pe, provided λ is sufficiently large. Orientational analysis indicates that particles maintain head-to-tail, head-to-side, and antiparallel alignments under shear, depending on s and Pe. The critical Pe required to induce cluster breakdown increases with both s and λ, underscoring the stabilizing influence of lateral dipole displacement and strong magnetic interactions. The transition to gas-like dispersion occurs when hydrodynamic and Brownian torques on the particles overcome the torques resulting from the interparticle interactions. Overall, these findings provide fundamental insights into the non-equilibrium self-assembly of anisotropic colloids, offering a framework for designing advanced materials with tunable structural and dynamic properties in microfluidics, drug delivery, and magnetorheological applications.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641296","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

Hyperuniform mixing of binary active spinners. 二元主动旋丝的超均匀混合。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-15 DOI: 10.1039/d5sm00458f

Rui Liu, Mingcheng Yang, Ke Chen

{"title":"Hyperuniform mixing of binary active spinners.","authors":"Rui Liu, Mingcheng Yang, Ke Chen","doi":"10.1039/d5sm00458f","DOIUrl":"https://doi.org/10.1039/d5sm00458f","url":null,"abstract":"Spinner mixtures consisting of both clockwise and counterclockwise self-spinning particles are often expected to phase separate. However, we demonstrate that such a demixing is absent for dimer (or rod-like) spinners. These particles always mix, even in a globally-hyperuniform way, with the total structure factor S(q → 0) ∼ qα (α > 0). This global hyperuniformity can be enhanced or weakened by changes in the driving torques or the particle density. The corresponding microscopic mechanism is attributed to the competition between a dynamical heterocoordination effect and effective like-particle attractions. Critical scaling for the absorbing state transition of the system is also found to persist, with a significant shift in its critical point observed. The system can be further thermalized, by the driving torques or through thermostating, into an ideal solution with identical partial radial distribution functions, which denies the possibility of being multi-hyperuniform. A simply-extended coupled density-oscillator theory explains why the system cannot be multi-hyperuniform, but can have a global hyperuniformity with the scaling exponent α approaching 2. Such a hyperuniform mixing provides a way to regulate the topological boundary flows of this chiral system, and this mixing regulation is found to barely affect the bulk density fluctuations, or even preserve the localization of the flows and the bulk hyperuniformity.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635794","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

Evolution of adaptive force chains in reconfigurable granular metamaterials. 可重构颗粒材料中自适应力链的演化。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-15 DOI: 10.1039/d4sm00965g

Sven Witthaus, Atoosa Parsa, Dong Wang, Nidhi Pashine, Jerry Zhang, Arthur K MacKeith, Mark D Shattuck, Josh Bongard, Corey S O'Hern, Rebecca Kramer-Bottiglio

{"title":"Evolution of adaptive force chains in reconfigurable granular metamaterials.","authors":"Sven Witthaus, Atoosa Parsa, Dong Wang, Nidhi Pashine, Jerry Zhang, Arthur K MacKeith, Mark D Shattuck, Josh Bongard, Corey S O'Hern, Rebecca Kramer-Bottiglio","doi":"10.1039/d4sm00965g","DOIUrl":"https://doi.org/10.1039/d4sm00965g","url":null,"abstract":"Under an externally applied load, granular packings form force chains that depend on the contact network and moduli of the grains. In this work, we investigate packings of variable modulus (VM) particles, where we can direct force chains by changing the Young's modulus of individual particles within the packing on demand. Each VM particle is made of a silicone shell that encapsulates a core made of a low-melting-point metallic alloy (Field's metal). By sending an electric current through a co-located copper heater, the Field's metal internal to each particle can be melted via Joule heating, which softens the particle. As the particle cools to room temperature, the alloy solidifies and the particle recovers its original modulus. To optimize the mechanical response of granular packings containing both soft and stiff particles, we employ an evolutionary algorithm coupled with discrete element method simulations to predict the patterns of particle moduli that will yield specific force outputs on the assembly boundaries. The predicted patterns of particle moduli from the simulations were realized in experiments using quasi-2D assemblies of VM particles and the force outputs on the assembly boundaries were measured using photoelastic techniques. These studies represent a step towards making robotic granular metamaterials that can dynamically adapt their mechanical properties in response to different environmental conditions or perform specific tasks on demand.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635767","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

Viscous dissipative energy density as a general adhesion characteristic of adhesive tape. 粘性耗散能量密度作为胶带的一般粘附特性。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-14 DOI: 10.1039/d5sm00347d

Kosuke Takahashi, Masako Yamada, Tatsuya Sasaki, Takashi Nakamura

{"title":"Viscous dissipative energy density as a general adhesion characteristic of adhesive tape.","authors":"Kosuke Takahashi, Masako Yamada, Tatsuya Sasaki, Takashi Nakamura","doi":"10.1039/d5sm00347d","DOIUrl":"https://doi.org/10.1039/d5sm00347d","url":null,"abstract":"The strength of adhesive tapes is generally evaluated using a peel or probe-tack test. However, these tests strongly depend on sample geometry considering the tape thickness of the backing film and pressure sensitive adhesive (PSA) layer. In this study, we propose the viscous dissipative energy density as a new parameter for evaluation, which is equivalent to the adhesion energy divided by the maximum elongation of the PSA layer during separation. Rubber-based adhesive tapes of different styrene contents were prepared, and their adhesion performance was evaluated based on the proposed parameter. Peel and probe-tack tests using tapes of various thicknesses were conducted with in situ observation using a high-speed camera. In the peel test, the adhesion energy can be obtained by converting the peel force using the tape width and peel angle; in the probe-tack test, it can be obtained by integrating the force divided by the contact area and elongation of the PSA layer. The adhesion energy divided by the maximum elongation from the probe-tack test showed an identical linear relationship with the strain rate of the PSA layer on a logarithmic scale, independent of the tape thickness. This relationship obtained from the peel test was slightly higher with more scattering. This is because the elongation of the PSA layer was distributed along the curved backing film, whereas it was almost uniform under the probe-tack test. Therefore, we confirmed that the viscous dissipative energy density can be used effectively as a material parameter, particularly when obtained from the probe-tack test.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144625038","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

Droplet spreading in a wedge: a route to fluid rheology for power-law liquids. 楔形液滴扩散：幂律液体的流体流变学研究途径。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-14 DOI: 10.1039/d5sm00286a

Marcel Moura, Vanessa Kern, Knut Jørgen Måløy, Andreas Carlson, Eirik G Flekkøy

引用次数: 0

Turbulent-like flows in quasi two-dimensional dense suspensions of motile colloids. 准二维运动胶体密集悬浮液中的湍流状流动。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-07-11 DOI: 10.1039/d5sm00192g

Rui Luo, Alexey Snezhko, Petia M Vlahovska

引用次数: 0