Soft Matter最新文献_第3页

Shear thickening inside elastic open-cell foams under dynamic compression. 动压缩下弹性开孔泡沫的剪切增厚。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-20 DOI: 10.1039/d4sm01144a

Samantha M Livermore, Alice Pelosse, Michael van der Naald, Hojin Kim, Severine Atis, Heinrich M Jaeger

{"title":"Shear thickening inside elastic open-cell foams under dynamic compression.","authors":"Samantha M Livermore, Alice Pelosse, Michael van der Naald, Hojin Kim, Severine Atis, Heinrich M Jaeger","doi":"10.1039/d4sm01144a","DOIUrl":"https://doi.org/10.1039/d4sm01144a","url":null,"abstract":"We measure the response of open-cell polyurethane foams filled with a dense suspension of fumed silica particles in polyethylene glycol at compression speeds spanning several orders of magnitude. The gradual compressive stress increase of the composite material indicates the existence of shear rate gradients in the interstitial suspension caused by wide distributions in pore sizes in the disordered foam network. The energy dissipated during compression scales with an effective internal shear rate, allowing for the collapse of three data sets for different pore-size foams. When scaled by this effective shear rate, the most pronounced energy increase coincides with the effective shear rate corresponding to the onset of shear thickening in our bulk suspension. Optical measurements of the radial deformation of the foam network and of the suspension flow under compression provide additional insight into the interaction between shear thickening fluid and foam. This optical data, combined with a simple model of a spring submerged in viscous flow, illustrates the dynamic interaction of viscous drag with foam elasticity as a function of compression rate, and identifies the foam pore size distribution as a critically important model parameter. Taken together, the stress measurements, dissipated energy, and relative motion of the fluid and the foam can be rationalized by knowing the pore size distribution and the average pore size of the foam.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996488","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

Self-assembly of chromatic patchy particles with tetrahedrally arranged patches. 带有四面体排列的斑块的彩色斑块粒子的自组装。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-20 DOI: 10.1039/d4sm01210k

Dariusz Tarasewicz, Edyta Raczyłło, Wojciech Rżysko, Łukasz Baran

{"title":"Self-assembly of chromatic patchy particles with tetrahedrally arranged patches.","authors":"Dariusz Tarasewicz, Edyta Raczyłło, Wojciech Rżysko, Łukasz Baran","doi":"10.1039/d4sm01210k","DOIUrl":"https://doi.org/10.1039/d4sm01210k","url":null,"abstract":"The achievement of selectivity in the formation of cubic diamond is challenging due to the emergence of competing phases such as its hexagonal polymorph or clathrates possessing similar free energy. Although both polymorphs exhibit a complete photonic bandgap, cubic diamond exhibits it at lower frequencies than the hexagonal counterpart, positioning it as a promising candidate for photonic applications. Herein, we demonstrate that the 1 : 1 mixture of identical patchy particles cannot selectively form the cubic diamond polymorph due to the frustrations present in the system that are manifested in the primary adsorption layer and propagate as the film grows. We provide a plausible explanation for why the binary system under confinement, resembling interactions between the complementary DNA bases, cannot yield the selectivity in the formation of cubic diamond crystals, which is based on the similarities to the antiferromagnetic systems. We always observe a mixture of both hexagonal and cubic diamonds; however, the formation of such stacking hybrids is observed for a wider range of patch sizes compared to the one-component system.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996486","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

Electrically conducting porous hydrogels by a self-assembled percolating pristine graphene network. 导电多孔水凝胶的自组装渗透原始石墨烯网络。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-20 DOI: 10.1039/d4sm01311e

Reihaneh Mohammadi Sejoubsari, Thomas O Xu, Shawn P Ward, Nishadi M Bandara, Zhihao Zhang, Douglas H Adamson

{"title":"Electrically conducting porous hydrogels by a self-assembled percolating pristine graphene network.","authors":"Reihaneh Mohammadi Sejoubsari, Thomas O Xu, Shawn P Ward, Nishadi M Bandara, Zhihao Zhang, Douglas H Adamson","doi":"10.1039/d4sm01311e","DOIUrl":"https://doi.org/10.1039/d4sm01311e","url":null,"abstract":"This study introduces a method for synthesizing electrically conductive hydrogels by incorporating a self-assembled, percolating graphene network. Our approach differs from previous approaches in two crucial aspects: using pristine graphene rather than graphene oxide and self-assembling the percolation network rather than creating random networks by blending. We use pristine graphene at an oil-water interface to stabilize a water-in-oil emulsion, successfully creating hydrogel foams with conductivities up to 15 mS m-1 and tunable porosity. Our approach avoids the need for the conductivity-degrading oxidation process to form GO and decreases the amount of graphitic filler needed for percolation, leading to superior mechanical properties. The concentration of monomer and graphite in the emulsion was optimized to control the cell size, stability, and swelling behavior of the final hydrogels, offering versatility in structure and functionality. Electrical conductivity and thermogravimetric analysis (TGA) confirmed the stability and conductive properties imparted by the graphene network. This method demonstrates a cost-effective route to conductive hydrogels, making them promising candidates for applications in sensors, energy storage, bioelectronics, and other advanced technologies.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996589","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

Lipophilic molecular rotor to assess the viscosity of oil core in nano-emulsion droplets. 亲脂分子转子评价纳米乳液滴中油芯的粘度。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-20 DOI: 10.1039/d4sm01234h

Mohamed Elhassan, Carla Faivre, Halina Anton, Guillaume Conzatti, Pascal Didier, Thierry Vandamme, Alteyeb S Elamin, Mayeul Collot, Nicolas Anton

{"title":"Lipophilic molecular rotor to assess the viscosity of oil core in nano-emulsion droplets.","authors":"Mohamed Elhassan, Carla Faivre, Halina Anton, Guillaume Conzatti, Pascal Didier, Thierry Vandamme, Alteyeb S Elamin, Mayeul Collot, Nicolas Anton","doi":"10.1039/d4sm01234h","DOIUrl":"https://doi.org/10.1039/d4sm01234h","url":null,"abstract":"Characterization of nanoscale formulations is a continuous challenge. Size, morphology and surface properties are the most common characterizations. However, physicochemical properties inside the nanoparticles, like viscosity, cannot be directly measured. Herein, we propose an original approach to measuring dynamic viscosity using a lipidic molecular rotor solubilized in the core of nano-formulations. These molecules undergo conformational changes in response to viscosity variations, leading to observable changes in fluorescence intensity and lifetime, able to sense the volume properties of dispersed nano-domains. The lipophilic molecular rotor (BOPIDY derivatives) was specifically synthesized and characterized as oil viscosity sensing in large volumes. A second part of the study compares these results with rBDP-Toco in nano-emulsions. The objective is to evaluate the impact of the formulation, droplet size and composition on the viscosity of the droplet's core. The lipophilic rotor showed a universal behavior whatever the oil composition, giving a master curve. Applied to nano-formulations, it reveals the viscosity inside the nano-emulsion droplets, enabling the detection of slight variations between reference oil samples and the nano-formulated ones. This new tool opens the way to the fine characterization of complex colloids and multi-domain nano and micro systems, potentially applied to hybrid materials and biomaterials.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996538","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

In situ formation of ultrahigh molecular weight polymers in highly concentrated electrolytes and their physicochemical properties. 高浓度电解液中超高分子量聚合物的原位形成及其物理化学性质。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-17 DOI: 10.1039/d4sm01248h

Yuji Kamiyama, Takeshi Ueki, Ryota Tamate

引用次数: 0

Using optical tweezer electrophoresis to investigate clay nanoplatelet adsorption on Latex microspheres in aqueous media. 用光学镊子电泳研究粘土纳米血小板在乳胶微球上的吸附。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-17 DOI: 10.1039/d4sm01319k

Vaibhav Raj Singh Parmar, Sayantan Chanda, Sri Vishnu Bharat Sivasubramaniam, Ranjini Bandyopadhyay

{"title":"Using optical tweezer electrophoresis to investigate clay nanoplatelet adsorption on Latex microspheres in aqueous media.","authors":"Vaibhav Raj Singh Parmar, Sayantan Chanda, Sri Vishnu Bharat Sivasubramaniam, Ranjini Bandyopadhyay","doi":"10.1039/d4sm01319k","DOIUrl":"https://doi.org/10.1039/d4sm01319k","url":null,"abstract":"The adsorption of charged clay nanoplatelets plays an important role in stabilizing emulsions by forming a barrier around the emulsion droplets and preventing coalescence. In this work, the adsorption of charged clay nanoplatelets on a preformed Latex microsphere in an aqueous medium is investigated at high temporal resolution using optical tweezer-based single-colloid electrophoresis. Above a critical clay concentration, charged clay nanoplatelets in an aqueous medium self-assemble gradually to form gel-like networks that become denser with increasing medium salinity. In a previous publication [R. Biswas et. al., Soft Matter, 2023, 19, 24007-2416], some of us had demonstrated that a Latex microsphere, optically trapped in a clay gel medium, is expected to attach to the network strands of the gel. In the present contribution, we show that for different ionic conditions of the suspending medium, the adsorption of clay nanoplatelets increases the effective surface charge on an optically trapped Latex microsphere while also enhancing the drag experienced by the latter. Besides the ubiquitous contribution of non-electrostatic dispersion forces in driving the adsorption process, we demonstrate the presence of an electrostatically-driven adsorption mechanism when the microsphere was optically trapped in a clay gel. These observations are qualitatively verified via cryogenic field emission scanning electron microscopy and are useful in achieving colloidal stabilisation, for example, during the preparation of clay-armoured Latex particles in Pickering emulsion polymerisation.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996496","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

Exploiting photopolymerization to modulate liquid crystalline network actuation. 利用光聚合调节液晶网络驱动。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-17 DOI: 10.1039/d4sm01360c

Marco Turriani, Niccolò Cosottini, Neri Fuochi, Diederik S Wiersma, Daniele Martella, Camilla Parmeggiani

{"title":"Exploiting photopolymerization to modulate liquid crystalline network actuation.","authors":"Marco Turriani, Niccolò Cosottini, Neri Fuochi, Diederik S Wiersma, Daniele Martella, Camilla Parmeggiani","doi":"10.1039/d4sm01360c","DOIUrl":"https://doi.org/10.1039/d4sm01360c","url":null,"abstract":"Liquid Crystalline Networks (LCNs) are widely investigated to develop actuators, from soft robots to artificial muscles. Indeed, they can produce forces and movements in response to a plethora of external stimuli, showing kinetics up to the millisecond time-scale. One of the most explored preparation technique involves the photopolymerization of an aligned layer of reactive mesogens. Following this approach, side-chain polymers are widely described, while a detailed comparison of light-responsive LCNs with different architectures is not properly addressed. In this paper, two synthetic approaches are exploited leading to photoresponsive LCNs with different architectures. Mixed main-chain/side-chain LCNs are obtained in one-pot through a thiol-acrylate chain-transfer reaction, while main-chain LCNs are achieved by a two-step approach involving an aza-Michael addition followed by acrylate crosslinking. Comparison among the two materials highlighted the superior performances in terms of tension developed upon light-activation of the former one, showing muscle-like force production comparable to standard side-chain LCNs combined with the greater ability to contract from common main-chain LCNs.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996354","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

Mechanical feedback links cell division and dynamics in growing cell collectives. 机械反馈将细胞分裂和生长中的细胞群动力学联系起来。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-17 DOI: 10.1039/d4sm01230e

Sumit Sinha, Xin Li, Abdul N Malmi-Kakkada, D Thirumalai

{"title":"Mechanical feedback links cell division and dynamics in growing cell collectives.","authors":"Sumit Sinha, Xin Li, Abdul N Malmi-Kakkada, D Thirumalai","doi":"10.1039/d4sm01230e","DOIUrl":"https://doi.org/10.1039/d4sm01230e","url":null,"abstract":"Local stresses in a tissue, a collective property, regulate cell division and apoptosis. In turn, cell growth and division induce active stresses in the tissue. As a consequence, there is a feedback between cell growth and local stresses. However, how the cell dynamics depend on local stress-dependent cell division and the feedback strength is not understood. Here, we probe the consequences of stress-mediated growth and cell division on cell dynamics using agent-based simulations of a two-dimensional growing tissue. We discover a rich dynamical behavior of individual cells, ranging from jamming (mean square displacement, Δ(t) ∼ tα with α less than unity), to hyperdiffusion (α > 2) depending on cell division rate and the strength of the mechanical feedback. Strikingly, Δ(t) is determined by the tissue growth law, which quantifies cell proliferation, measuring the number of cells N(t) as a function of time. The growth law (N(t) ∼ tλ at long times) is regulated by the critical pressure that controls the strength of the mechanical feedback and the ratio between cell division-apoptosis rates. We show that λ ∼ α, which implies that higher growth rate leads to a greater degree of cell migration. The variations in cell motility are linked to the emergence of highly persistent forces extending over several cell cycle times. Our predictions are testable using cell-tracking imaging techniques.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996540","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

Dynamical arrest for globular proteins with patchy attractions. 具有片状吸引力的球状蛋白的动态阻滞。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-17 DOI: 10.1039/d4sm01275e

Maxime J Bergman, Tommy Garting, Cristiano De Michele, Peter Schurtenberger, Anna Stradner

{"title":"Dynamical arrest for globular proteins with patchy attractions.","authors":"Maxime J Bergman, Tommy Garting, Cristiano De Michele, Peter Schurtenberger, Anna Stradner","doi":"10.1039/d4sm01275e","DOIUrl":"https://doi.org/10.1039/d4sm01275e","url":null,"abstract":"Attempts to use colloid science concepts to better understand the dynamic properties of concentrated or crowded protein solutions are challenging due to the fact that globular proteins generally have heterogeneous surfaces that result in anisotropic or patchy contributions to their interaction potential. This is particularly difficult when targeting non-equilibrium transitions such as glass and gel formation in concentrated protein solutions. Here we report a systematic study of the reduced zero shear viscosity ηr of the globular protein γB-crystallin, an eye lens protein that plays a vital role in vision-related phenomena such as cataract formation or presbyopia, and compare the results to the existing structural and dynamic data. Combining two different tracer particle-based microrheology methods allows us to precisely locate the line of kinetic arrest within the phase diagram and characterize the functional form of the concentration and temperature dependence of ηr. We show that while our results qualitatively confirm the existing view that this protein can be reasonably well described using a coarse-grained picture of a patchy colloid with short range attractions, there are a number of novel findings that cannot easily be understood with the existing simple colloid models. We demonstrate in particular the complete failure of an extended law of corresponding states for a description of the temperature dependence of the arrest line, and discuss the role that transient clusters play in this context.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11740010/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996588","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

Crystallization in load-controlled shearing flows of monosized spheres. 负载控制的单尺寸球体剪切流中的结晶。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-16 DOI: 10.1039/d4sm01359j

Esma Kurban, Dalila Vescovi, Diego Berzi

{"title":"Crystallization in load-controlled shearing flows of monosized spheres.","authors":"Esma Kurban, Dalila Vescovi, Diego Berzi","doi":"10.1039/d4sm01359j","DOIUrl":"https://doi.org/10.1039/d4sm01359j","url":null,"abstract":"Identical, inelastic spheres crystallize when sheared between two parallel, bumpy planes under a constant load larger than a minimum value. We investigate the effect of the inter-particle friction coefficient of the sheared particles on the flow dynamics and the crystallization process with discrete element simulations. If the imposed load is about the minimum value to observe crystallization in frictionless spheres, adding small friction to the granular assembly results in a shear band adjacent to one of the planes and one crystallized region, where a plug flow is observed. The ordered particles are arranged in both face-centered cubic and hexagonal-closed packed phases. The particles in the shear band are in between the crystalline state and the fluid state, but the latter is never reached, which results in a large shear resistance. As the particle friction increases, the shear band disappears, and the ordering in the core region is destroyed. A significant portion of the particles are in a fluid state with a zero shear rate, leading to a substantial and unexpected reduction in the shear resistance with respect to the frictionless case. If the imposed load is increased well above the minimum from the onset of crystallization, we observe the formation of one shear band in the core, where the particles are again between the crystalline state and the fluid state, surrounded by two crystallized regions near the boundaries, in which most of the particles are in the face-centered cubic phase and translate as a rigid body with the boundaries themselves. In this case, the macroscopic shear resistance is independent of the particle friction.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996587","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