Frontiers in Soft Matter最新文献_第6页

Recent scattering approaches to structure and dynamics of polymer nanocomposites 聚合物纳米复合材料结构与动力学的散射研究进展

Frontiers in Soft Matter Pub Date : 2022-09-13 DOI: 10.3389/frsfm.2022.992563

M. Kruteva, A. Genix, O. Holderer, J. Oberdisse

引用次数: 1

Equilibrium configurations in a nematic pi-cell under an electric field 电场作用下向列型电池的平衡构型

Frontiers in Soft Matter Pub Date : 2022-09-02 DOI: 10.3389/frsfm.2022.984400

Aaron Allen, Xiaoyu Zheng

引用次数: 0

Birefringence-modulated total internal reflection in liquid crystal shells 液晶壳的双折射调制全内反射

Frontiers in Soft Matter Pub Date : 2022-08-30 DOI: 10.3389/frsfm.2022.991375

N. Popov, J. Lagerwall

{"title":"Birefringence-modulated total internal reflection in liquid crystal shells","authors":"N. Popov, J. Lagerwall","doi":"10.3389/frsfm.2022.991375","DOIUrl":"https://doi.org/10.3389/frsfm.2022.991375","url":null,"abstract":"The combination of anisotropic boundary conditions and topological constraints acting on a spherical shell of nematic liquid crystal confined between aqueous phases gives rise to peculiar but well-defined configurations of the director field, and thus of the optic axis that defines the impact of the nematic birefringence. While the resulting optics of nematic shells has been extensively investigated in transmission, studies of the reflection behavior are scarce. Here we show that nematic shells exhibit specific light guiding paths mediated by birefringence-modulated total internal reflection (TIR) within the shell. With stabilizers promoting tangential boundary conditions, shells show immobile antipodal spots revealing the locations of maximum effective refractive index, but their intensity is modulated by the polarization of the illuminating light. With normal-aligning stabilizers, shells instead show bright arcs separated by dark spots, and these follow the rotation of the polarization of the illuminating light. Reflection polarizing microscopy thus offers a valuable complement to the more common characterization in transmission, adding data that can be helpful for accurately mapping out director fields in shells of any liquid crystal phase. Moreover, the TIR-mediated light guiding paths may offer interesting handles to localize photopolymerization of reactive liquid crystal shells or to dynamically modulate the response of light-triggered liquid crystal elastomer shell actuators.","PeriodicalId":409762,"journal":{"name":"Frontiers in Soft Matter","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115835856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Impact of deamidation on the physicochemical properties and air-water interfacial behaviour of gliadin nanoparticles 脱酰胺对麦胶蛋白纳米颗粒物理化学性质和空气-水界面行为的影响

Frontiers in Soft Matter Pub Date : 2022-08-24 DOI: 10.3389/frsfm.2022.937152

Maryam Moraveji, A. Sadat, I. Joye

{"title":"Impact of deamidation on the physicochemical properties and air-water interfacial behaviour of gliadin nanoparticles","authors":"Maryam Moraveji, A. Sadat, I. Joye","doi":"10.3389/frsfm.2022.937152","DOIUrl":"https://doi.org/10.3389/frsfm.2022.937152","url":null,"abstract":"Gliadin due to its low water solubility is excellently suited to make biopolymeric nanoparticles through liquid antisolvent precipitation. These gliadin nanoparticles (GNPs) can be utilized to populate and stabilize interfaces. Gliadin, by nature a protein that carries a low charge, can be altered by deamidation. Deamidation effectively alters the physicochemical properties of gliadin through decreasing the protein’s isoelectric point (IEP). The objective of this study is to explore the effect of different degrees of deamidation on gliadin nanoparticle (interfacial) characteristics. Besides altering the physical stability of GNP suspensions, deamidation did alter the functionality of GNPs as interfacial agents. GNP behaviour at the air-water interface is substantially impacted by pH. Particles made with untreated and deamidated gliadin exhibited a greater tendency to adsorb and form strong viscoelastic films at the air-water interface and better foam structures closer to their IEP. The combination of SEM, confocal Raman microscopy and drop tensiometry provides unique insights in the dominant gliadin structures and interactions at the interfacial film. This study provides crucial insights into the potential of deamidation to tailor gliadin and GNP properties for specific food applications.","PeriodicalId":409762,"journal":{"name":"Frontiers in Soft Matter","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133069545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation of viscoelasticity and interfacial potential of polyelectrolyte brush by Ion-specific interactions 离子特异性相互作用对聚电解质电刷粘弹性和界面电位的调节

Frontiers in Soft Matter Pub Date : 2022-07-19 DOI: 10.3389/frsfm.2022.959542

Akihisa Yamamoto, K. Hayashi, Ai Sumiya, F. Weissenfeld, Satoko Hinatsu, Wasim Abuillan, Masaki Nakahata, Motomu Tanaka

{"title":"Modulation of viscoelasticity and interfacial potential of polyelectrolyte brush by Ion-specific interactions","authors":"Akihisa Yamamoto, K. Hayashi, Ai Sumiya, F. Weissenfeld, Satoko Hinatsu, Wasim Abuillan, Masaki Nakahata, Motomu Tanaka","doi":"10.3389/frsfm.2022.959542","DOIUrl":"https://doi.org/10.3389/frsfm.2022.959542","url":null,"abstract":"Polyelectrolyte brushes have drawn increasing attention because their physicochemical properties can be modulated by adjustment of the pH and ion concentration. Here, we report the controlled grafting of poly acrylic acid containing cysteine side chains onto supported lipid membranes to allow for the modulation of viscoelasticity as well as interfacial potential by ion-specific interactions, that is, with cadmium ions. Quartz crystal microbalance with dissipation indicated that the resonance frequency increased and the dissipation decreased as the cadmium concentration increased, attributed to the dehydration of brushes. Systematic variation of the molecular structure demonstrated that the coexistence of thiol and carboxyl moieties is necessary for the viscoelastic response, suggesting that these structural features, common with naturally occurring proteins, form complexes with cadmium ions. Analysis of the height fluctuation of colloidal particles by reflection interference contrast microscopy indicated that the change in the viscoelasticity of the polymer brush layer alters the curvature of the effective interfacial potential. Intriguingly, we found that modulation of the viscoelasticity and interfacial potential caused by calcium ions is weak, suggesting that the interaction is ion-specific. Polymer brushes that can alter the interfacial potential through changes in the degree of hydration opens new avenues for the design of smart, adaptable surfaces.","PeriodicalId":409762,"journal":{"name":"Frontiers in Soft Matter","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125214327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Opportunities and challenges in biological soft matter research 生物软物质研究的机遇与挑战

Frontiers in Soft Matter Pub Date : 2022-07-18 DOI: 10.3389/frsfm.2022.958524

Jay X. Tang

引用次数: 2

Can the Concentration of a Transcription Factor Affect Gene Expression? 转录因子的浓度能影响基因表达吗?

Frontiers in Soft Matter Pub Date : 2022-07-01 DOI: 10.3389/frsfm.2022.914494

Zafer Koşar, A. Erbaş

{"title":"Can the Concentration of a Transcription Factor Affect Gene Expression?","authors":"Zafer Koşar, A. Erbaş","doi":"10.3389/frsfm.2022.914494","DOIUrl":"https://doi.org/10.3389/frsfm.2022.914494","url":null,"abstract":"DNA is the ultimate molecule that encodes life through genes. Genes positioned along the meter-long DNA molecule have to be expressed at the right time and in the right amount via strict regulatory processes. Regulation of a gene starts with the binding of a DNA-binding protein known as a transcription factor (TF) to a target regulatory element along the double-stranded DNA molecule. Often, TFs attach to DNA in a sequence-specific manner and can target DNA motifs of various lengths, yet some TFs can also interact with DNA nonspecifically. The resulting DNA-TF complexes can control gene expression directly via controlling the recruitment of RNA polymerase on the target DNA sequence. Recent single-molecule experiments have added a new dimension to such control mode; the lifetime of a DNA-TF complex (i.e., the residence time of the protein on its DNA site) can function as a regulatory component. This breakthrough inevitably suggests that any physiochemical constituent that can alter the residence time of a DNA-binding protein can also be involved in gene regulation. In this perspective, we argue that a TF protein’s cellular concentration can contribute to the cell-scale transcription activity by modulating the DNA-residence time of the protein. Cells can achieve this either by enabling a concentration-dependent dissociation mechanism or by promoting the formation of multiprotein-DNA complexes. While our discussion here will consider examples from prokaryotic cells, we will also briefly argue that similar mechanisms could also be functional in eukaryotic cells.","PeriodicalId":409762,"journal":{"name":"Frontiers in Soft Matter","volume":"284 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134184510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Influence of pH on the Lipase Digestion of Nanosized Triolein, Diolein and Monoolein Films pH对脂肪酶酶解纳米三油酸、二油酸和单油酸膜的影响

Frontiers in Soft Matter Pub Date : 2022-06-28 DOI: 10.3389/frsfm.2022.929104

Ben A. Humphreys, J. Campos-Terán, T. Arnold, L. Baunsgaard, J. Vind, C. Dicko, T. Nylander

引用次数: 3

Flow-induced buckling of elastic microfilaments with non-uniform bending stiffness 非均匀弯曲刚度弹性微丝的流致屈曲

Frontiers in Soft Matter Pub Date : 2022-06-24 DOI: 10.3389/frsfm.2022.977729

T.-h. Nguyen, Harishankar Manikantan

{"title":"Flow-induced buckling of elastic microfilaments with non-uniform bending stiffness","authors":"T.-h. Nguyen, Harishankar Manikantan","doi":"10.3389/frsfm.2022.977729","DOIUrl":"https://doi.org/10.3389/frsfm.2022.977729","url":null,"abstract":"Buckling plays a critical role in the transport and dynamics of elastic microfilaments in Stokesian fluids. However, previous work has only considered filaments with homogeneous structural properties. Filament backbone stiffness can be non-uniform in many biological systems like microtubules, where the association and disassociation of proteins can lead to spatial and temporal changes into structure. The consequences of such non-uniformities in the configurational stability and transport of these fibers are yet unknown. Here, we use slender-body theory and Euler-Bernoulli elasticity coupled with various non-uniform bending rigidity profiles to quantify this buckling instability using linear stability analysis and Brownian simulations. In shear flows, we observe more pronounced buckling in areas of reduced rigidity in our simulations. These areas of marked deformations give rise to differences in the particle extra stress, indicating a non-trivial rheological response due to the presence of these filaments. The fundamental mode shapes arising from each rigidity profile are consistent with the predictions from our linear stability analysis. Collectively, these results suggest that non-uniform bending rigidity can drastically alter fluid-structure interactions in physiologically relevant settings, providing a foundation to elucidate the complex interplay between hydrodynamics and the structural properties of biopolymers.","PeriodicalId":409762,"journal":{"name":"Frontiers in Soft Matter","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126761535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Combined Wetting and Scattering Study of the Near Surface Ordering in Sugar Surfactant Based Bicontinuous Microemulsions at Hydrophilic and Hydrophobic Surfaces 基于糖表面活性剂的双连续微乳亲疏水表面近表面有序的润湿和散射联合研究

Frontiers in Soft Matter Pub Date : 2022-06-06 DOI: 10.3389/frsfm.2022.887610

S. Wellert, R. Stehle, Samantha Micciulla, Margarethe Dahl, R. Steitz, T. Hellweg, O. Holderer

引用次数: 0