IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm00695j

Redhills L Narendran, Archita Patnaik

{"title":"Reversible pH-responsive supramolecular aggregates from viologen based amphiphiles - a molecular design perspective.","authors":"Redhills L Narendran, Archita Patnaik","doi":"10.1039/d4sm00695j","DOIUrl":"https://doi.org/10.1039/d4sm00695j","url":null,"abstract":"pH responsive self-assembled supramolecular systems in water hold tremendous promise spanning across the various realms of science and technology. Herein, we report the design and synthesis of benzyl viologen (BV) based amphiphiles and their ability to form pH responsive aggregates with a water soluble anionic dye (electron donor), a polyelectrolyte (PE), and a surfactant. To counter the low solubility of viologen derivatives, β-cyclodextrin (β-CD) was employed as a solubility promoter and the host-guest complexes were characterized by NMR spectroscopy. The impacts of increasing the number of benzyl units on (i) the water solubility of viologens, (ii) the response of the aggregates of viologens with pyranine, PE, and surfactants towards pH, and (iii) the influence of β-CD on the pH-responsive nature of BV-pyranine, BV-PE, BV-surfactant, etc. were investigated. Apart from improving the solubility of viologens, β-CD also imparted pH-responsive dissolution/aggregation behavior to the viologen-anionic polyelectrolyte and viologen-anionic surfactant complexes. The pH switchable behaviour of the soft supramolecular aggregates in water was rationalized in light of a delicate balance prevailing between multiple non-covalent interactions. Based on the results, we propose an elegant molecular design principle to generate pH responsive colloidal aggregates from amphiphiles and oppositely charged molecular systems.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646172","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

Magnetic colloidal single particles and dumbbells on a tilted washboard moiré pattern in a precessing external field. 预处理外场中倾斜洗衣板摩尔纹图案上的磁性胶体单颗粒和哑铃。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm01183j

Farzaneh Farrokhzad, Nico C X Stuhlmüller, Piotr Kuświk, Maciej Urbaniak, Feliks Stobiecki, Sapida Akhundzada, Arno Ehresmann, Daniel de Las Heras, Thomas M Fischer

引用次数: 0

Phase behavior of symmetric diblock copolymers under 3D soft confinement. 三维软约束下对称二嵌段共聚物的相行为。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm01020e

Zhijuan He, Jin Huang, Kai Jiang, An-Chang Shi

{"title":"Phase behavior of symmetric diblock copolymers under 3D soft confinement.","authors":"Zhijuan He, Jin Huang, Kai Jiang, An-Chang Shi","doi":"10.1039/d4sm01020e","DOIUrl":"https://doi.org/10.1039/d4sm01020e","url":null,"abstract":"The phase behavior of symmetric diblock copolymers under three-dimensional (3D) soft confinement is investigated using self-consistent field theory. Soft confinement is realized in binary blends composed of AB diblock copolymers and C homopolymers, where the copolymers self-assemble to form a droplet embedded in a homopolymer matrix. The phase behavior of the confined block copolymers is regulated by the degree of confinement and the selectivity of the homopolymers, resulting in a rich variety of novel structures. When the C homopolymers are neutral to the A- and B-blocks, stacked lamellae (SL) are formed where the number of layers increases with the droplet volume, resulting in a morphological transition sequence from Janus particles to square SL. When the C homopolymers are strongly selective for the B-blocks, a series of non-lamellar morphologies, including onion-, hamburger-, cross-, ring-, and cookie-like structures, are observed. A detailed free energy analysis reveals a first-order reversible transformation between SL and onion-like (OL) structures when the selectivity of the homopolymers is changed. Our results provide a comprehensive understanding of how various factors, such as the copolymer concentration, homopolymer chain length, degree of confinement, and homopolymer selectivity, affect the self-assembled structures of diblock copolymers under soft 3D confinement.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646170","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

Individual closed-loop control of micromotors by selective light actuation. 通过选择性光驱动实现微电机的单独闭环控制。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm00810c

David P Rivas, Max Sokolich, Sambeeta Das

引用次数: 0

Solvent-free confinement of ordered microparticle monolayers: effect of host substrate and pattern symmetry. 有序微粒单层的无溶剂封闭：主基质和图案对称性的影响。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm01196a

Ignaas S M Jimidar, Mitch T J de Waard, Gijs Roozendaal, Kai Sotthewes

{"title":"Solvent-free confinement of ordered microparticle monolayers: effect of host substrate and pattern symmetry.","authors":"Ignaas S M Jimidar, Mitch T J de Waard, Gijs Roozendaal, Kai Sotthewes","doi":"10.1039/d4sm01196a","DOIUrl":"https://doi.org/10.1039/d4sm01196a","url":null,"abstract":"The self-organisation of individual suspended colloids into ordered structures that can be mediated by confinement has garnered interest recently. Despite the push for solvent reduction for sustainability reasons, the comprehension and development of solvent-free assembly methods remain largely unaddressed. In this study, we explore the effect of confinement without rigid geometrical constraints, i.e., wall-less confinement on the assembly of monodisperse PMMA powder microspheres (diameters of 3 μm and 10 μm) on fluorocarbon-patterned heterogeneous substrates using a solvent-free rubbing assembly approach. Our findings reveal that the PMMA microspheres self-align on the fluorocarbon patterns, adapting to various geometrical shapes of these patterns through symmetry matching. The assembly process is driven by triboelectric charging and elastic properties of the microspheres and substrates. Moreover, we observe that the host substrate and the particle and pattern size ratio significantly influence the ordering of the microparticles on the fluorocarbon patterns. Ultimately, we demonstrate the successful use of fluorocarbon patterns to assemble tunable crystal patterns on rigid substrates, which typically do not exhibit any ordering.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646174","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

The thickness-dependent response of aerosol-jet-printed ultrathin high-aspect-ratio electrochemical microactuators. 气溶胶喷射打印超薄高宽比电化学微执行器的厚度依赖性响应

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm00886c

Ji Zhang, Jeremy J Baumberg, Sohini Kar-Narayan

{"title":"The thickness-dependent response of aerosol-jet-printed ultrathin high-aspect-ratio electrochemical microactuators.","authors":"Ji Zhang, Jeremy J Baumberg, Sohini Kar-Narayan","doi":"10.1039/d4sm00886c","DOIUrl":"10.1039/d4sm00886c","url":null,"abstract":"Trilayer electrochemical actuators comprising an electrolyte layer sandwiched between two electrode layers have been shown to exhibit large deformations at low actuation voltages. Here we report the aerosol-jet printing (AJP) of high-aspect-ratio bending-type trilayer electrochemical microactuators comprised of Nafion as the electrolyte and poly(3,4-ethylenedioxythiophene)polystyrene sulfonate (PEDOT:PSS) as the electrode. We investigated how the thicknesses of the electrolyte and electrode layers affect the DC response of these actuators by fabricating high-aspect-ratio trilayer cantilevers with varied layer thicknesses (0.36 μm to 1.9 μm-thick electrodes, and 3.5 μm to 12 μm-thick electrolyte layers). We found that the transported charge and angular deflection are proportional to the applied voltage at steady state, and the charge-to-voltage ratio scales with the PEDOT:PSS thickness. The deflection-to-voltage ratio is found to be strongly affected by the Nafion electrolyte thickness, showing a decreasing trend, but is less affected by the PEDOT:PSS thickness in the range of dimensions fabricated. The timescales for deflection are found to be generally longer than the timescales for charge transfer and no clear trend is observed with respect to layer thicknesses. This work establishes an experimental protocol in geometry optimisation of printed electrochemical microactuators, verifies the applicability of a theoretical model, and lays the groundwork for designing and optimising more sophisticated printed electrochemical microactuation systems.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646176","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

Fibrotaxis: gradient-free, spontaneous and controllable droplet motion on soft solids. Fibrotaxis：软固体上的无梯度、自发和可控液滴运动。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm01022a

Sthavishtha R Bhopalam, Jesus Bueno, Hector Gomez

引用次数: 0

Modeling collagen fibril degradation as a function of matrix microarchitecture. 作为基质微结构函数的胶原纤维降解模型。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-18 DOI: 10.1039/d4sm00971a

Bhanjan Debnath, Badri Narayanan Narasimhan, Stephanie I Fraley, Padmini Rangamani

{"title":"Modeling collagen fibril degradation as a function of matrix microarchitecture.","authors":"Bhanjan Debnath, Badri Narayanan Narasimhan, Stephanie I Fraley, Padmini Rangamani","doi":"10.1039/d4sm00971a","DOIUrl":"https://doi.org/10.1039/d4sm00971a","url":null,"abstract":"Collagenolytic degradation is a process fundamental to tissue remodeling. The microarchitecture of collagen fibril networks changes during development, aging, and disease. Such changes to microarchitecture are often accompanied by changes in matrix degradability. In a matrix, the pore size and fibril characteristics such as length, diameter, number, orientation, and curvature are the major variables that define the microarchitecture. In vitro, collagen matrices of the same concentration but different microarchitectures also vary in degradation rate. How do different microarchitectures affect matrix degradation? To answer this question, we developed a computational model of collagen degradation. We first developed a lattice model that describes collagen degradation at the scale of a single fibril. We then extended this model to investigate the role of microarchitecture using Brownian dynamics simulation of enzymes in a multi-fibril three dimensional matrix to predict its degradability. Our simulations predict that the distribution of enzymes around the fibrils is non-uniform and depends on the microarchitecture of the matrix. This non-uniformity in enzyme distribution can lead to different extents of degradability for matrices of different microarchitectures. Our simulations predict that for the same enzyme concentration and collagen concentration, a matrix with thicker fibrils degrades more than that with thinner fibrils. Our model predictions were tested using in vitro experiments with synthetic collagen gels of different microarchitectures. Experiments showed that indeed degradation of collagen depends on the matrix architecture and fibril thickness. In summary, our study shows that the microarchitecture of the collagen matrix is an important determinant of its degradability.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142646168","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

Dynamics of switching processes: general results and applications in intermittent active motion. 切换过程的动力学：间歇性主动运动的一般结果和应用。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-15 DOI: 10.1039/d4sm01054j

Ion Santra, Kristian Stølevik Olsen, Deepak Gupta

引用次数: 0

CO₂-induced drastic decharging of dielectric surfaces in aqueous suspensions. 二氧化碳诱导水悬浮液中介质表面急剧放电。

IF 2.9 3区化学

Soft Matter Pub Date : 2024-11-15 DOI: 10.1039/d4sm00957f

Peter Vogel, David Beyer, Christian Holm, Thomas Palberg

{"title":"CO2-induced drastic decharging of dielectric surfaces in aqueous suspensions.","authors":"Peter Vogel, David Beyer, Christian Holm, Thomas Palberg","doi":"10.1039/d4sm00957f","DOIUrl":"10.1039/d4sm00957f","url":null,"abstract":"We study the influence of airborne CO2 on the charge state of carboxylate stabilized polymer latex particles suspended in aqueous electrolytes. We combine conductometric experiments interpreted in terms of Hessinger's conductivity model with Poisson-Boltzmann cell (PBC) model calculations with charge regulation boundary conditions. Without CO2, a minority of the weakly acidic surface groups are dissociated and only a fraction of the total number of counter-ions actually contribute to conductivity. The remaining counter-ions exchange freely with added other ions like Na+, K+ or Cs+. From the PBC-calculations we infer a corresponding pKa of 4.26 as well as a renormalized charge in reasonably good agreement with the number of freely mobile counter-ions. Equilibration of salt- and CO2-free suspensions against ambient air leads to a drastic de-charging, which exceeds by far the expected effects of to dissolved CO2 and its dissociation products. Further, no counter-ion-exchange is observed. To reproduce the experimental findings, we have to assume an effective pKa of 6.48. This direct influence of CO2 on the state of surface group dissociation explains our recent finding of a CO2-induced decrease of the ζ-potential and supports the suggestion of an additional charge regulation caused by molecular CO2. Given the importance of charged surfaces in contact with aqueous electrolytes, we anticipate that our observations bear substantial theoretical challenges and important implications for applications ranging from desalination to bio-membranes.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142612841","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

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