百欧林 Jun 25, ’54 < 20200225

百欧林简报-表界面科学最新文献- QSense -2020年第1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. Release of deposited MnO2 nanoparticles from aqueous surfaces
    Author: Hainan Wang,Ruixing Huang,Chengxue Ma,Xiaoling Li, Caihong Liu, Qiang He, Zhengsong Wu, Jun Ma and Xiaoliu Huangfu
    Journal: Journal of Environmental Sciences
    DOI: 10.1016/j.jes.2019.12.011
    Abstract: Changes in solution chemistry and transport conditions can lead to the release of deposited MnO2 nanoparticles from a solid interface, allowing them to re-enter the aqueous environment. Understanding the release behavior of MnO2 nanoparticles from naturally occurring surfaces is critical for better prediction of the transport potential and environmental fate of MnO2 nanoparticles. In this study, the release of MnO2 nanoparticles was investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D), and different environmental surface types, solution pH values and representative macromolecular organics were considered…
  2. Characterization of chitosan-lysine surfactant bioactive coating on silicone substrate
    Authors: Urban Ajdnik, Matjaž Finšgar and Lidija Fras Zemljič
    Journal: Carbohydrate Polymers
    DOI: 10.1016/j.carbpol.2019.115817
    Abstract: Chitosan (Chi) and anionic surfactant derived from lysine (77KS) were used to prepare a novel bioactive coating and as a drug delivery system for amoxicillin (AMOX) on a model polydimethylsiloxane (PDMS) surface. The bioactive coating was formulated as polyelectrolyte-surfactant complex (PESC). Aggregation behaviour between the cationic Chi and oppositely charged 77KS in bulk was analysed using turbidity and ζ-potential measurement. Furthermore, the adsorption and stability of the formulations were evaluated using quartz crystal microbalance with dissipation (QCM-D)…
  3. Effect of Amines on the Lubricity of Castor Oil-Sulfated Sodium Salt Solution for Titanium Alloys
    Authors: Ye Yang, Tengfei Liu, Yuanjing Dai, Yan Wang and Chenhui Zhang
    Journal: Tribology Letters
    DOI: 10.1007/s11249-019-1261-9
    Abstract: This work investigates the effect of amines on the lubricity of castor oil-sulfated sodium salt (CSS) emulsion solution for titanium alloys. It is found that the amines with hydrophilic parts such as diglycolamine, have a negative effect on the lubrication while those with hydrophobic parts such as dicyclohexylamine (DCHA), show a synergistic effect when they are mixed with the CSS. The mechanisms of both the synergistic and negative effects of amines are investigated. The quartz crystal microbalance with dissipation-monitoring results show that the ammonium salt with hydrophobic parts such as DCHA can form a strong adsorption film on the titanium surface…
  4. Carboxybetaine functionalized nanosilicas as protein resistant surface coatings
    Authors: Knowles, B. R., Wagner, P., Maclaughlin, S., Higgins, M. J., & Molino, P. J.
    Journal: Biointerphases
    DOI: 10.1063/1.5126467
    Abstract Materials with protein resistant properties are increasingly sought after for their potential application as low-fouling surface coatings. Hydrophilic coatings with improved resistance to protein fouling have been prepared from zwitterionic carboxybetaine (CB) functionalized silica nanoparticles (SiNPs). The authors report three methods of coating preparation via direct tethering of CB to predeposited particle films, a two-step surface functionalization process, and deposition of CB functionalized particle dispersions. The pH at which aqueous CB solutions were prepared and reacted to SiNPs was found to drastically influence the mechanism of CB attachment and affect the protein resistance of the resultant coatings…
  5. Deposition of cellulose nanocrystals onto biomimetic lipid membranes
    Authors: Yotam Navon, Bruno Jean, Liliane Coche-Guerente, Franck Dahlem, Anne Bernheim-Groswasser and Laurent Heux
    Journal: Langmuir
    DOI: 10.1021/acs.langmuir.9b02888
    Abstract: The deposition of cellulose nanocrystals (CNCs) on a supported lipid bilayer (SLB) was investigated at different length scales. A quartz crystal microbalance with dissipation monitoring (QCM-D) was used to probe the bilayer formation and to show for the first time the CNCs deposition onto the SLB. Specifically, classical QCM-D measurements gave estimation of the adsorbed hydrated mass and the corresponding film thickness, whereas complementary experiments using D2O as the solvent allowed the quantitative determination of the hydration of the CNCs layer, showing a high hydration value. Scanning force microscopy (SFM) and total internal reflection fluorescence microscopy (TIRF) were used to probe the homogeneity of the deposited layers and reveal the structural details at the particle and film length scales, respectively, and to give information on the effect of CNCs concentration on the surface coverage…6. pH-Responsive Copolymer Films Prepared by Surface-Initiated Polymerization and Simple Modification
    Authors: Xuanli Deng, Joshua L. Livingston, Nathan Spear and G. Kane Jennings
    Journal: Langmuir
    DOI: 10.1021/acs.langmuir.9b03026
    Abstract: We report the preparation of pH-responsive, ester/carboxylic acid random copolymer films via simple modification of poly(norbornene diacyl chloride) (pNBDAC), prepared via surface-initiated ring-opening metathesis polymerization, with mixtures of water and ethanol to form carboxylic acid and ethyl ester side groups. The pNBDAC film serves as a compositionally versatile platform to controllably obtain copolymers with multiple functionalities. In modifying the pNBDAC to form the copolymer film, ethanol exhibits a significantly higher reactivity with acyl chloride groups within the film than does water…
    7. Further interpretation of the underlying causes of the strengthening effect of alkali on gluten and noodle quality: Studies on gluten, gliadin, and glutenin
    Author: Chuanwu Han, Meng Ma, Man Li and Qingjie Sun
    Journal: Food Hydrocolloids
    DOI: 10.1016/j.foodhyd.2020.105661
    Abstract: Alkali significantly enhanced gluten strength and noodle texture. To further understand the underlying mechanisms of the gluten strengthening effect of alkali, the macroscopic rheological properties, microstructure, intermolecular interactions, water mobility, molecular weight distribution (MWD) and structure, and the molecular chain morphology changes of gluten and its subfractions (glutenin and gliadin) were separately investigated. Alkali increased the G′ and G″ of gluten and glutenin fractions. Scanning electron microscopy (SEM) images confirmed that alkali induced a more compact structure in all fractions and a membrane-like structure in gluten and glutenin. Quartz crystal microbalance with dissipation (QCM-D) results demonstrated that alkali promoted alkali/protein-protein interactions in gluten and glutenin fractions…

    8 . Supramolecular Protein Assembly Retains Its Structural Integrity at Liquid–Liquid Interface
    Authors: Mridul Sarker, Hwankyu Lee, Rui A. Gonçalves, Yeng Ming Lam, Haibin Su and Sierin Lim
    Journal: Advanced Materials Interfaces
    DOI: 10.1002/admi.201901674
    Abstract: Adsorption of globular proteins at liquid–liquid interface results in compromised structures and functionalities to maintain a thermodynamically favorable state. However, the structural behavior of highly symmetrical supramolecular protein assemblies, adsorbed at the liquid–liquid interface, is not well understood. In this study, a model supramolecular protein assembly, E2 protein nanocage, a dodecahedral cage‐structured protein, is studied upon adsorption at the oil–water interface by both theoretical and experimental analyses…
  1. Formation and characteristics of mixed lipid/polymer membranes on a crystalline surface-layer protein lattice
    Authors: Czernohlavek, Christian, and Bernhard Schuster
    Journal: Biointerphases
    DOI: 10.1116/1.5132390
    Abstract: The implementation of self-assembled biomolecules on solid materials, in particular, sensor and electrode surfaces, gains increasing importance for the design of stable functional platforms, bioinspired materials, and biosensors. The present study reports on the formation of a planar hybrid lipid/polymer membrane on a crystalline surface layer protein (SLP) lattice. The latter acts as a connecting layer linking the biomolecules to the inorganic base plate. In this approach, chemically bound lipids provided hydrophobic anchoring moieties for the hybrid lipid/polymer membrane on the recrystallized SLP lattice. The rapid solvent exchange technique was the method of choice to generate the planar hybrid lipid/polymer membrane on the SLP lattice. The formation process and completeness of the latter were investigated by quartz crystal microbalance with dissipation monitoring and by an enzymatic assay using the protease subtilisin A, respectively…
  2. Electrochemically induced changes in TiO2 and Carbon films, studied with QCM-D
    Authors: Narayanan, Aditya, Frieder Mugele, and Michael HG Duits
    Journal: ACS Applied Energy Materials
    DOI:1021/acsaem.9b02233
    Abstract: Semi-solid fluid electrode-based battery (SSFB) and supercapacitor technologies are seen as very promising candidates for grid energy storage. However, unlike for traditional batteries, their performance can quickly get compromised by the formation of poorly conducting Solid Electrolyte Interphase on the particle surfaces. In this work we examine SEI film formation in relation to typical electrochemical conditions, by combining Cyclic Voltammetry (CV) with Quartz Crystal Microbalance-Dissipation monitoring (QCM-D)…
  3. Synergistic improvement in the performance of insect odorant receptor based biosensors in the presence of Orco
    Authors: Roshan Khadka, Colm Carraher, Cyril Hamiaux, Jadranka Travas-Sejdic and AndrewKralicek
    Journal: Biosensors and Bioelectronics
    DOI: 10.1016/j.bios.2020.112040
    Abstract: Insect odorant receptors (ORs) are believed to be a complex of an odorant binding subunit, OrX, and an ion channel forming subunit, Orco. In our previous study, we showed that the OrX subunit on its own in liposomes could detect volatile organic compounds (VOCs) ultrasensitively using Electrochemical Impedance Spectroscopy (EIS). In this study, we investigated the effect of the presence of Orco on the response of the OrX subunit to detect the VOCs. The OrXs – Or10a, Or22a, Or35a and Or71a, together with Orco, were recombinantly expressed, purified and integrated into liposomes. These OrX/Orco liposomes were covalently attached to a gold surface modified with N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide) (NHS/EDC)-activated self-assembled monolayers (SAMs) of 6-mercaptohexanoic acid (MHA). It was demonstrated that the OrX/Orco liposomes could sensitively and selectively detect their ligands by monitoring a change in frequency and impedance signal upon binding with both Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) and EIS…
  4. Quartz Crystal Microbalance Based Sensor Arrays for Detection and Discrimination of VOCs Using Phosphonium Ionic Liquid Composites
    Authors: Vaughan, S. R., Pérez, R. L., Chhotaray, P., and Warner, I. M.
    Journal: Sensors
    DOI: 10.3390/s20030615
    Abstract: Herein, we examine two sensing schemes for detection and discrimination of chlorinated volatile organic compounds (VOCs). In this work, phosphonium ionic liquids (ILs) were synthesized and vapor sensing properties examined and compared to phosphonium IL-polymer composites. Pure IL sensors were used to develop a QCM-based multisensory array (MSA), while IL-polymer composites were used to develop an MSA and virtual sensor arrays (VSAs). It was found that by employing the composite MSA, five chlorinated VOCs were accurately discriminated at 95.56%, which was an increase in accuracy as compared to pure ILs MSA (84.45%). Data acquired with two out of three VSAs allowed discrimination of chlorinated VOCs with 100% accuracy. These studies have provided greater insight into the benefits of incorporating polymers in coating materials for enhanced discrimination accuracies of QCM-based sensor arrays. To the best of our knowledge, this is the first report of a QCM-based VSA for discrimination of closely related chlorinated VOCs.
  5. Effect of surface chemistry on hMSC growth under xeno-free conditions
    Authors: Maura Cimino, Paula Parreira, Sílvia Bidarra, Raquel M.Gonçalves, Cristina C.Barrias and M. Cristina L.Martins
    Journal: Colloids and Surfaces B: Biointerfaces
    DOI: 10.1016/j.colsurfb.2020.110836
    Abstract: Human mesenchymal stem/stromal cells (hMSC) are promising therapeutic agents for regenerative medicine. However, therapeutic doses necessary for clinical application require in vitro expansion, ideally under Xeno-Free conditions (XF) to avoid the use of foetal bovine serum (FBS). We previously reported that hMSCs could be expanded using a pharmaceutical-grade human plasma-derived supplement for cell culture (SCC, Plastem®) combined with bFGF and TGFβ1, on fibronectin (Fn)-coated surfaces…
  6. RoomTemperature Partial Conversion of αFAPbI3 Perovskite Phase via PbI2 Solvation Enables HighPerformance Solar Cells
    Authors: Dounya Barrit, Peirui Cheng, Kasra Darabi, Ming‐Chun Tang, Detlef‐M. Smilgies, Shengzhong (Frank) Liu, Thomas D. Anthopoulos, Kui Zhao and Aram Amassian
    Journal: Advanced Functional Materials
    DOI: 10.1002/adfm.201907442
    Abstract: The two‐step conversion process consisting of metal halide deposition followed by conversion to hybrid perovskite has been successfully applied toward producing high‐quality solar cells of the archetypal MAPbI3 hybrid perovskite, but the conversion of other halide perovskites, such as the lower bandgap FAPbI3, is more challenging and tends to be hampered by the formation of hexagonal nonperovskite polymorph of FAPbI3, requiring Cs addition and/or extensive thermal annealing. Here, an efficient room‐temperature conversion route of PbI2 into the α‐FAPbI3 perovskite phase without the use of cesium is demonstrated. Using in situ grazing incidence wide‐angle X‐ray scattering (GIWAXS) and quartz crystal microbalance with dissipation (QCM‐D), the conversion behaviors of the PbI2 precursor from its different states are compared…
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