百欧林 Apr 31, ’11 < 20191231

百欧林简报-表界面科学最新文献- QSense -2019年第18期

瑞典百欧林科技有限公司为纳米尺度的表/界面研究提供精确稳定的实验仪器及数据分析系统。借助于我们的仪器,来自全球的科学家在各领域的顶级刊物上发表了数以千计的文章,百欧林为您实时推送科学家们最新发表的科研成果。

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1. Influence of Water Contamination on the SEI Formation in Li-Ion Cells: An Operando EQCM-D Study
Author: Paul Kitz, Petr Novák, Erik Berg
Journal: ChemRxiv
DOI: 10.26434/chemrxiv.10255580.v1
Abstract: The interphase formation on carbon (C) anodes in LiPF6/EC + DEC Li-ion battery electrolyte is analyzed by combining operando electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) with in situ online electrochemical mass spectrometry (OEMS). EQCM-D enables unique insights into the anode solid electrolyte interphase (SEI) mass/thickness, its viscoelastic properties, and changes of electrolyte viscosity during the initial formation cycles. The interphase in pure electrolyte is relatively soft (G’SEI ≈ 0.2 MPa, ηSEI ≈ 10 mPa s) and changes its viscoelastic properties dynamically as a function of electrode po-tential. With increasing electrolyte water content, the SEI becomes thicker and much more rigid. Doubly labeled D218O is added to the electrolyte in order to precisely track the reaction pathway of water at the anode by OEMS…

2. Nanoparticle Charging with Mixed Reverse Micelles in Apolar Media
Authors: Benjamin S.Ponto and John C.Berg
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects
DOI: 10.1016/j.colsurfa.2019.124275
Abstract: The charging of colloidal particles using mixed surfactants in apolar media is investigated. Previous work has shown that one can predict the sign and magnitude of particle charge by comparing the acid-base properties of an oil-soluble surfactant to the acid-base properties of a specific particle. The present work sought to tune the acid-base properties by using mixed surfactants. Unexpected mineral oxide particle charging results were obtained however, from mixing the acidic surfactant sorbitan monooleate (SPAN 80), with the basic surfactant polyisobutylene succinimide (OLOA 11000), requiring further investigation into the mixed reverse co-micelle particle charging mechanism. Conductometric titrations and small-angle neutron and x-ray scattering measurements showed that the surfactant mixtures formed spherical reverse co-micelles. Quartz crystal microbalance adsorption measurements demonstrated that both surfactants can adsorb to the particle surface…

3. Interaction and Adsorption of Hydrophobically Modified Polyacrylamide on Silica and Asphaltene Surfaces
Authors: Wenjie Zou, Zichuan Fang, Zhijun Zhang, and Zhenzhen Lu
Journal: Advances in Polymer Technology
DOI: 10.1155/2019/5423178
Abstract: The adsorption of polymers affects the cost and oil recovery in oil reservoir exploitation and the flocculation effect in the treatment of oil sand tailings. The adhesion and adsorption of a hydrophobically modified polyacrylamide (HMPAM), i.e., P(AM-NaAA-C16DMAAC), on silica and asphaltene were investigated using surface force measurements, thermodynamic analysis and quartz crystal microbalance with dissipation (QCM-D) measurement…

4. Site-Specific and Covalent Immobilization of His-Tagged Proteins via Surface Vinyl Sulfone-Imidazole Coupling
Authors: Mingyang Li, Fang Cheng, Haoqiang Li, Weiwei Jin, Chen Chen, Wei He, Gang Cheng and Qing Wang
Journal: Langmuir
DOI: 10.1021/acs.langmuir.9b02933
Abstract: Site-specific immobilization of proteins on a surface has been a long-lasting challenge in the fields of biosensing and biotechnology, because of the need for improving the biological activity of immobilized protein via the maximal exposure of its bioactive domain. Herein, we reported a new site-specific immobilization method for his-tagged proteins onto vinyl sulfone (VS)-bearing surface in a covalent manner. X-ray photoelectron spectroscopy (XPS) characterization indicated the specificity of the addition reaction of the imidazole group in histidine on the VS-bearing surface at pH 7.0. Solution-based experiments were carried out to verify the reaction priority of imidazole residue of histidine with the VS group at neutral conditions. The real-time immobilization process of two his-tagged proteins (HaloTag-6His and anti-HER2 Fab-6His) on surfaces presenting VS, pre-activated carboxyl, and NTA groups were studied by quartz crystal microbalance (QCM)…

5. BMP-2 functionalized PEDOT:PSS-based OECTs for stem cell osteogenic differentiation monitoring
Authors: Francesco Decataldo, Victor Druet, Anna-Maria Pappa, Ellasia Tan, Achilleas Savva, Charalampos Pitsalidis, Sahika Inal, Ji-Seon Kim, Beatrice Fraboni, Roisin Owens
Journal: Flexible and Printed Electronics
DOI: 10.1088/2058-8585/ab5bfc
Abstract: Stem cell osteogenic differentiation is a complex process, associated with a number of events such as the secretion of collagen type I, osteopontin, osteonectin, osteocalcin and Bone Morphogenic Protein 2 (BMP-2). These molecules can be used as markers to monitor stem cell fate while studying the effects of a specific osteogenic differentiation treatment (e.g. electrical stimulation). Currently available techniques, such as the evaluation of the expression levels of specific genes and end-point biochemical assays, do not allow real-time monitoring of cellular processes, therefore overlooking potentially interesting information…

6. Peptide disc mediated control of membrane protein orientation in supported lipid bilayers for surface-sensitive investigations
Authors: Alessandra Luchini, Frederik Grønbæk Tidemand, Nicolai Tidemand Johansen, Mario Campana, Javier Sotres, Michael Ploug, Marité Cárdenas and Lise Arleth
Journal: Anal. Chem.
DOI: 10.1021/acs.analchem.9b04125
Abstract: In vitro characterization of membrane proteins requires experimental approaches providing mimics of the microenvi-ronment that proteins encounter in native membranes. In this context, supported lipid bilayers provide a suitable plat-form to investigate membrane proteins by a broad range of surface-sensitive techniques such as Neutron Reflectometry (NR), Quartz Crystal Microbalance with Dissipation monitoring (QCM-D), Surface Plasmon Resonance (SPR), Atomic Force Microscopy (AFM) and fluorescence microscopy…

7. Surface Grafted MSI-78A Antimicrobial Peptide has High Potential for Gastric Infection Management
Author: Paula Parreira, Claudia Monteiro, Vanessa Graça, Joana Gomes, Sílvia Maia, Paula Gomes, Inês C. Gonçalves and M. Cristina L. Martins
Journal: Scientific Reports
DOI: 10.1038/s41598-019-53918-4
Abstract: As we approach the end of the antibiotic era, newer therapeutic options, such as antimicrobial peptides (AMPs), are in urgent demand. AMP surface grafting onto biomaterials has been described as a good strategy to overcome problems associated with their in vivo stability. Helicobacter pylori is among the bacteria that pose greatest threat to human health, being MSI-78A one of the few bactericidal AMPs against this bacterium. Here, we report that MSI-78A grafted onto model surfaces (Self-Assembled Monolayers –SAMs), in a concentration of 30.3 ± 1.2 ng/cm2 determined by quartz crystal microbalance with dissipation (QCM-D), was able to kill, by contact, 98% of planktonic H. pylori in only 2 h…

8 .Correlation Between the Adsorption and the Nanotribological Performance of Fatty Acid-Based Organic Friction Modifiers on Stainless Steel
Authors: Zita Zachariah, Prathima C. Nalam, Amogha Ravindra, Archana Raju, Anupama Mohanlal, Kaiyu WangR. Veronica Castillo and Rosa M. Espinosa-Marzal
Journal: Tribology Letters
DOI: 10.1007/s11249-019-1250-z
Abstract: Surface adsorption of amphiphilic molecules is a vital mechanism of boundary lubrication on stainless steel surfaces. The self-assembly of four fatty acid-based organic friction modifiers in two alkane solvents and their adsorption onto stainless steel surfaces was investigated using Dynamic Light Scattering and Quartz Crystal Balance with Dissipation, respectively. These properties were related to the friction force between a sharp tip and the steel surface measured using Lateral Force Microscopy…

9. Supported Lipid Membranes at the Au‐Buffer Interface by Solvent Exchange: The Effect of Initial Solvent Concentration
Authors: Kai Betlem, George Cordoyiannis and Patricia Losada-Pérez
Journal: physica status solidi (a).
DOI: 10.1002/pssa.201900837
Abstract: The recently introduced solvent‐assisted lipid bilayer (SALB) formation method has proved a fast, simple, and versatile alternative to vesicle fusion in forming membrane‐mimicking platforms on solid supports such as SiO2, TiO2, graphene, and Au. This confers SALB with a broad applicability for developing biomaterial coatings for implants, biomimetic cell culture platforms, and cancer diagnostics. Although significant understanding on the interplay of the parameters controlling SALB (type of solvent, lipid concentration, and flow rate) has been achieved to date, there still exists several unexplored specific questions to be tackled. Herein, the question of how the initial solvent concentration affects the formation and organization of (zwitterionic) lipid membranes formed by SALB on Au surfaces is addressed. Using quartz crystal microbalance with dissipation monitoring, differences in frequency and dissipation responses are observed upon dissolving the lipid compound dimyristoyl phosphatidylcholine (DMPC) in either pure isopropanol or mixtures of different volume ratios of isopropanol and aqueous buffer…

10. Probing the influence of tether density on tethered bilayer lipid membrane (tBLM)-peptide interactions
Authors: Soohyun Park, Saziye Yorulmaz Avsar, Bruce Cornell, Abdul Rahim Ferhan, Won-Yong Jeon, Minsub Chung and Nam-JoonCho
Journal: Applied Materials Today
DOI: 10.1016/j.apmt.2019.100527
Abstract: Tethered bilayer lipid membranes (tBLMs) represent a promising model membrane system that can host transmembrane proteins to serve as biosensors with exceptional detection performance. Herein, using the quartz crystal microbalance-dissipation (QCM-D) technique, we systematically investigated the influence of tether density on tBLM-peptide interactions and characterized the membrane binding dynamics of membrane-active peptides on tBLMs using AH peptide as a model. To achieve both physical stability and nanoscale separation from the support substrate, the tBLMs were fabricated on self-assembled monolayers (SAMs) obtained using a mixture of tether and spacer molecules with controlled tether-to-spacer ratio from 1:99 (T1) to 100:0 (T100). The solvent-assisted lipid bilayer (SALB) formation method was then employed to form the tBLMs, before the introduction of AH peptide. The QCM-D measurement responses indicated that the interactions between AH peptide and tBLMs involved peptide adsorption on the membrane layer followed by peptide translocation across the membrane…

11. Biofuel powered glucose detection in bodily fluids with an n-type conjugated polymer
Authors: David Ohayon, Georgios Nikiforidis, Achilleas Savva, Andrea Giugni, Shofarul Wustoni, Tamilarasan Palanisamy, Xingxing Chen, Iuliana Petruta Maria, Enzo Di Fabrizio, Pedro M. F. J. Costa, Iain McCulloch & Sahika Inal
Journal: Nature Materials
DOI: 10.1038/s41563-019-0556-4
Abstract: A promising class of materials for applications that rely on electron transfer for signal generation are the n-type semiconducting polymers. Here we demonstrate the integration of an n-type conjugated polymer with a redox enzyme for the autonomous detection of glucose and power generation from bodily fluids. The reversible, mediator-free, miniaturized glucose sensor is an enzyme-coupled organic electrochemical transistor with a detection range of six orders of magnitude. This n-type polymer is also used as an anode and paired with a polymeric cathode in an enzymatic fuel cell to convert the chemical energy of glucose and oxygen into electrical power…

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