百欧林简报-表界面科学最新文献- QSense -2019年第11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。

[订阅]

1.Name：Interactions of arabinogalactans with bacterial cellulose during its synthesis: structure ａnd physical properties

Authors：Dehui Lin, Patricia Lopez-Sanchez ａnd Michael J.Gidley

Journal：Food Hydrocolloids

DOI: 10.1016/j.foodhyd.2019.06.010

Abstract：Arabinogalactans (AGs) are plant cell wall constituents, some of which find applications in the food industry. However, there is very limited information about the interactions of AGs with other plant polysaccharides, in particular with cellulose. In the present work, we studied the interactions of two types of AGs, of different botanical origin ａnd Ara/Gal ratio, with cellulose during ａnd after its synthesis by Komagataeibacter xylinus (ATCC 53524). Solution depletion experiments ａnd quartz crystal microbalance with dissipation monitoring show that these two kinds of AG are able to bind reversibly to pre-made cellulose, as also reflected by their relative incorporation in self-assembled composites during cellulose synthesis, with values of 18.0 % (w/w) for acacia AG (Ara:Gal 1:0.9) ａnd 29.1% (w/w) for larch AG (Ara:Gal 1:1.3).

Link：https://www.sciencedirect.com/science/article/pii/S0268005X19302905

2.Name：Multifunctional Tannic Acid (TA) ａnd Lysozyme (Lys) Films Built by Layer by Layer for Potential Application on Implant Coating

Authors：Shuoshuo Yang, Yong Wang, Xiaoxiao Wu, Sunren Sheng, Tian Wang ａnd Xingjie Zan

Journal：ACS Biomaterials-Science & Engineering

DOI: 10.1021/acsbiomaterials.9b00717

Abstract：A multifunctional (TA/Lys)n film, featuring with good antioxidant, fast cell attachment at early stage, enhanced osteogenesis ａnd broad-spectrum antibacterial property, was constructed by layer-by-layer (LBL) method. The building process was monitored by quartz crystal microbalance with dissipation (QCM-D); the physical properties, such as topography, stiffness in dry ａnd liquid state, ａnd conformation of Lys in the film, were thoroughly characterized.

Link：https://pubs.acs.org/doi/abs/10.1021/acsbiomaterials.9b00717

3.Name：Wettability of quartz controlled by UV light irradiation using an azobenzene surfactant

Authors：Rui Dong, Xiaoming Jiang, Chunling Hao, Wei Xu, Huiyong Li, Yue Chen ａnd Tian Xie

Journal：Colloids ａnd Surfaces A: Physicochemical ａnd Engineering Aspects

DOI: 10.1016/j.colsurfa.2019.123586

Abstract：Solids having controllable wettabilty have received much attention due to their great importance in many industrial fields. In this paper, the quartz surfaces ａnd particles with reversibly switchable wettability have been studied. The wettability of quartz can be controlled by UV light irradiation in the presence of an azobenzene surfactant (AZO). The adsorption behavior of AZO at the quartz-liquid interface was investigated by the measurements of the surface tension, contact angle ａnd Zeta potential. The adsorption process was monitored by the quartz crystal microbalance with dissipation (QCM-D).The results show that AZO has a strong tendency to adsorb at the quartz–liquid interface.

Link：https://www.sciencedirect.com/science/article/pii/S0927775719305692

4.Name：Hydrophobic ａnd hydrophilic SiO2-based hybrids in the protection of sandstone for anti-salt damage

Authors：Mengjun Jia, Junyan Liang, Ling He, Xiang Zhao ａnd Stefan Simon

Journal：Journal of Cultural Heritage

DOI: 10.1016/j.culher.2019.06.001

Abstract：The anti-salt damage of sandstone protected by hydrophobic ａnd hydrophilic SiO2-based hybrids is evaluated in NaCl, Na2SO4 ａnd NaCl-Na2SO4 salt-loaded hydrothermal aging (SLHA) cycles. Although both hydrophobic ａnd hydrophilic SiO2-based hybrids could prevent the sandstone from salt damage through improving the matrix strength, the hydrophobic hybrid performs much better protection than hydrophilic one. The sandstone protected by hydrophobic SiO2-based hybrid shows nearly no salt-damage, which is attributed to its excellent water repellence, high adhesive strength ａnd good compatibility with sandstone matrix.

Link：https://www.sciencedirect.com/science/article/pii/S1296207418307301

5.Name：High Performance Organic Electrochemical Transistors based on Conjugated Polyelectrolyte Copolymers

Authors：Philip Schmode, David Ohayon, Paul M. Reichstein, Achilleas Savva, Sahika Inal ａnd Mukundan Thelakkat

Journal：Chemistry of Materials

DOI: 10.1021/acs.chemmater.9b01722

Abstract：A new generation of polythiophene-based polyelectrolytes are reported to address fundamental issues in an organic electrochemical tran-sistor (OECT). In such devices, the semiconductor must be able to transport ａnd store ions ａnd to possess simultaneously a very high electronic mobility. For this, the ion-conducting 6-(thiophen-3-yl) hexane-1-sulfonate tetramethyl ammonium monomer (THS-TMA+) is copolymerized with the hole-conducting 3-hexylthiophene (3HT) to obtain copolymers, PTHS-TMA+-co-P3HT 1-3 with a gradient archi-tecture.

Link：https://pubs.acs.org/doi/abs/10.1021/acs.chemmater.9b01722

6.Name：Magnetically Responsive Janus Nanoparticles Synthesized using Cellulosic Materials for Enhanced Phase Separation in Oily Wastewaters ａnd Water-in-crude Oil Emulsions

Authors：Xiao He, Chen Liang, Qingxia Liu ａnd Zhenghe Xu

Journal：Chemical Engineering Journal

DOI: 10.1016/j.cej.2019.122045

Abstract：A new class of magnetically responsive Janus (M-Janus) nanoparticles was designed ａnd synthesized by sequential adsorption of cellulosic materials: hydrophobic ethyl cellulose (EC) ａnd hydrophilic carboxymethyl cellulose (CMC) on the opposite sides of magnetite (Fe3O4) nanoparticles. The adsorption study using quartz crystal microbalance with dissipation (QCM-D) proved the concept of proposed synthesis of magnetically responsive (M-Janus) nanoparticles. The adsorption of EC ａnd CMC on magnetite nanoparticles was confirmed by zeta-potential measurements, thermogravimetric analysis (TGA), characterization using Fourier transform infrared spectroscopy (FTIR) ａnd TEM.

Link：https://www.sciencedirect.com/science/article/pii/S1385894719314391

7.Name：Surface properties of adsorbed salivary components at a solid hydrophobic surface using a quartz crystal microbalance with dissipation (QCM–D)

Authors：Miodrag Glumac, Christos Ritzoulis ａnd Jianshe Chen

Journal：Food Hydrocolloids

DOI: 10.1016/j.foodhyd.2019.105195

Abstract：Saliva is a human biological fluid that consists of many inorganic ａnd organic substances such as salivary proteins, which play many roles during the consumption of foods. Some of these roles are not well understood while others still remain unknown. Very recent study from this group showed that saliva can function as an effective emulsifier during oral processing of dietary lipids. Therefore, our aim in this work was to establish surface functionality of salivary components at molecular level by using quartz crystal microbalance with dissipation (QCM–D) technique. Both unstimulated saliva ａnd unstimulated dialyzed saliva were studied for their adsorption at a solid hydrophobic surface (SiO2), so that the role of smaller molecular weight salivary components can be examined. Based on the current model system, it was found that large molecular weight components of saliva play a compatibilizing role between water ａnd oil. This allows adhesion to oral tissue surfaces, ａnd could have implications for the perception of oil/fat inside the mouth.

Link：https://www.sciencedirect.com/science/article/pii/S0268005X19306393

8.Name：Solvent Engineering for High‐Performance n‐Type Organic Electrochemical Transistors

Authors：Achilleas Savva, David Ohayon, Jokubas Surgailis, Alexandra F. Paterson, Tania C. Hidalgo, Xingxing Chen, Iuliana P. Maria, Bryan D. Paulsen, Anthony J. Petty II, Jonathan Rivnay, Iain McCulloch ａnd Sahika Inal

Journal：Advanced Electronic Materials

DOI: 10.1002/aelm.201900249

Abstract：Organic electrochemical transistors (OECTs) exhibit strong potential for various applications in bioelectronics, especially as miniaturized, point‐of‐care biosensors, because of their efficient transducing ability. To date, however, the majority of reported OECTs have relied on p‐type (hole transporting) polymer mixed conductors, due to the limited number of n‐type (electron transporting) materials suitable for operation in aqueous electrolytes, ａnd the low performance of those which exist. It is shown that a simple solvent‐engineering approach boosts the performance of OECTs comprising an n‐type, naphthalenediimide‐based copolymer in the channel. The addition of acetone, a rather bad solvent for the copolymer, in the chloroform‐based polymer solution leads to a three‐fold increase in OECT transconductance, as a result of the simultaneous increase in volumetric capacitance ａnd electron mobility in the channel.

Link：https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201900249

9.Name：Effect of Interfacial Water on Nanomechanical Properties of Negatively Charged Floating Bilayers Supported on Gold Electrodes

Authors：Joanna Juhaniewicz-Debinska, Dorota Konarzewska ａnd Slawomir Sek

Journal：Langmuir

DOI: 10.1021/acs.langmuir.9b01311

Abstract：Floating lipid bilayers composed of phosphatidylglycerols ａnd cardiolipin were deposited on gold electrodes pre-modified with 1-thio-β-D-glucose monolayer by spreading of small unilamellar vesicles. The resulting lipid membrane was homogenous ａnd its thickness was ~5.0 nm. Electrochemical characterization combined with surface enhanced infrared absorption spectroscopy revealed that negative polarization of the electrode leads to accumulation of water molecules in the interfacial region between lipid membrane ａnd the thioglucose film. Moreover, the buildup of water layer was demonstrated to affect the nanomechanical properties of the membrane.

Link：https://pubs.acs.org/doi/abs/10.1021/acs.langmuir.9b01311

10.Name：Temperature-activated PEG surface segregation controls the protein repellency of polymers

Authors：N. Sanjeeva Murthy, Wenjie Wang, Sven D. Sommerfeld, David Vaknin ａnd Joachim Kohn

Journal：Langmuir

DOI: 10.1021/acs.langmuir.9b00702

Abstract：Poly(ethylene glycol) (PEG) is widely used to modulate the hydration states of biomaterials ａnd is often applied to produce non-fouling surfaces. Here we present X-ray scattering data which show that non-fouling is caused the surface segregation of PEG, not just its presence in the bulk. We demonstrate a temperature-dependent trigger that transforms a PEG-containing substrate from a protein-adsorbing to a protein-repelling state. On films of poly(desaminotyrosyl-tyrosine-co-PEG carbonate) with high (20 wt %) PEG content, in which very little protein adsorption would have been expected, quartz crystal microbalance (QCM) data showed significant adsorption of fibrinogen (Fg) ａnd bovine serum albumin (BSA) at 8 °C.

Link：https://pubs.acs.org/doi/abs/10.1021/acs.langmuir.9b00702