Soft Matter最新文献_第2页

Pinch-off dynamics of emulsion filaments before and after polymerization of the internal phase. 内相聚合前后乳液细丝的掐断动力学。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-21 DOI: 10.1039/d4sm00618f

Parisa Bazazi, Howard A Stone

{"title":"Pinch-off dynamics of emulsion filaments before and after polymerization of the internal phase.","authors":"Parisa Bazazi, Howard A Stone","doi":"10.1039/d4sm00618f","DOIUrl":"10.1039/d4sm00618f","url":null,"abstract":"The capillary break-up of complex fluid filaments occurs in many scientific and industrial applications, particularly in bio-printing where both liquid and polymerized droplets exist in the fluid. The simultaneous presence of fluid and solid particles within a carrier fluid and their interactions lead to deviations in the filament break-up from the well-established capillary breakup dynamics of single-phase liquids. To examine the significance of the dispersed phase and the internal interactions between liquid droplets and solid particles, we prepare emulsions through photopolymerization and conduct experimental investigations into the pinch-off dynamics of fluid filaments, focusing on the impact of varying concentrations of liquid droplets (before polymerization) and polymerized droplets. Despite the increase in bulk viscosity due to the presence of polymerized droplets in the fluid and their aggregation, the results show that polymerization significantly reduces the length of the fluid filament before breakup, thus shortening the duration of pinch-off. We investigate two categories of complex fluids, characterized by their droplet sizes: (i) sub-micrometer droplets and (ii) droplets with an average diameter of 50 micrometers. In emulsions containing sub-micrometer droplets, the individual droplet contributions remain undetectable during capillary breakup, and the measured pinch-off dynamics predominantly reflect the bulk shear viscosity or viscoelasticity of the system. This is due to the droplet sizes falling below our imaging resolution. In contrast, emulsions with larger polymerized droplets exhibit behavior analogous to single-phase carrier fluids: once the filament's length equals the droplet diameter, the droplets are expelled. Concurrently, larger liquid droplets are deformed and elongated along the flow direction. Our study highlights the effect of mixing liquid and polymerized droplets on the capillary breakup dynamics of fluid filaments, providing insights to formulate 3D printing inks.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11749522/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996547","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

Two-dimensional squishy glass: yielding under oscillatory shear. 二维软玻璃：振动剪切作用下的屈服。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-21 DOI: 10.1039/d4sm01069h

Sayantan Ghosh, Rahul Nayak, Satyavani Vemparala, Pinaki Chaudhuri

引用次数: 0

Boundaries and cross-linking densities modulate domain sizes of polydomain nematic elastomers. 边界和交联密度调节多畴向列弹性体的畴尺寸。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-21 DOI: 10.1039/d4sm01419g

Takuya Ohzono, Kaoru Katoh, Nariya Uchida

{"title":"Boundaries and cross-linking densities modulate domain sizes of polydomain nematic elastomers.","authors":"Takuya Ohzono, Kaoru Katoh, Nariya Uchida","doi":"10.1039/d4sm01419g","DOIUrl":"https://doi.org/10.1039/d4sm01419g","url":null,"abstract":"When nematic liquid crystal elastomers (LCEs) crosslinked at their isotropic phase are quenched to the nematic phase, they show polydomain patterns, in which nematic microdomains with different orientations self-organize into a three-dimensional mosaic with characteristic correlation patterns. The orientational correlation length of the domain, which is usually in the micrometer range, is believed to emerge as a result of a competition between liquid crystalline ordering and frozen network inhomogeneity. Although polydomain patterns show potentials as the basic platform for optical, memory, and mechanical devices, no study exists regarding how they are modulated by experimentally accessible parameters. Here, using confocal polarized fluorescence microscopy, we study the effects of a solid-wall or open boundary on the domain size in conjunction with effects of cross-linking density. The LCE bounded by solid glass shows reduced domain size near the boundary. In contrast, increased domain size appears at the free surface. With increasing cross-linking density, the domain size decreases, also exhibiting the boundary effects. Guided by theoretical considerations, the results are explained by a picture that the effective strength of the inhomogeneity frozen in the polymer network, i.e., the effective disorder strength, varies depending on the cross-linking density and constrained states at boundaries. The results offer the first experimental approach to global and local modulation of the polydomain pattern in nematic LCEs.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996585","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

Modular addition strategy-regulated polymerization-induced self-assembly: an in silico experiment. 模块化加成策略调控聚合诱导自组装：一个硅实验。

IF 2.9 3区化学

Soft Matter Pub Date : 2025-01-20 DOI: 10.1039/d4sm01403k

Bin Liu, Hui Lu, Yuqi Guo, Hong Liu, Tianhang Zhou, Yao-Hong Xue

{"title":"Modular addition strategy-regulated polymerization-induced self-assembly: an in silico experiment.","authors":"Bin Liu, Hui Lu, Yuqi Guo, Hong Liu, Tianhang Zhou, Yao-Hong Xue","doi":"10.1039/d4sm01403k","DOIUrl":"https://doi.org/10.1039/d4sm01403k","url":null,"abstract":"We propose a modular addition strategy-regulated polymerization-induced self-assembly (PISA) system to effectively control the reaction kinetics and self-assembly morphologies. We validated this strategy by performing in silico experiments on a well-established PISA system. Two categories of modular addition strategies, i.e., the multistep addition strategy and the constant rate addition strategy, were investigated. Results showed that the modular addition operation of macromolecular chain transfer agents (macro-CTAs) effectively regulated the width of the molecular weight distribution for the hydrophobic PSt block, which further led to an assembly of vesicle structures with irregular aspherical cavities. Besides, we found a new transition pathway for the formation of vesicles, which involved generation of small vesicles in the early stage followed by a gradual growth in the intermediate and late stages. In the constant rate addition strategy, with the increase in the addition rate of macro-CTA, we found that the morphology basically tended to change from a micellar structure to a vesicle structure. This study holds potential to inspire future work toward the improvement of experimental techniques in PISA-relevant systems.","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":"142996543","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 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