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ACS Applied Materials & Interfaces

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https://www.readbyqxmd.com/read/30439287/friction-and-adhesion-of-different-structural-defects-of-graphene
#1
Manoj Tripathi, Firas Awaja, Rafael A Bizão, Stefano Signetti, Erica Iacob, Guido Paolicelli, Sergio Valeri, Alan B Dalton, Nicola Maria Pugno
Graphene structural defects, namely edges, step-edges and wrinkles are susceptible to severe mechanical deformation and stresses under frictional operations. Applied forces cause deformation by folding, buckling, bending and tearing the defective sites of graphene, which lead to a remarkable decline in normal load and friction bearing capacity. In this work, we experimentally quantified the maximal normal and friction forces corresponding to the damage thresholds of the different investigated defects as well as their pull-out (adhesion) forces...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433763/fast-3d-microscopy-imaging-of-contacts-between-surfaces-using-a-fluorescent-liquid
#2
Dina Petrova, Bart Weber, Clémence Allain, Pierre Audebert, Daniel Bonn, Albert Manfred Brouwer
A novel method is presented for the rapid 3D visualization of the contact between two surfaces by means of fluores-cence microscopy using a fluorescent liquid. Distances be-tween the surfaces of up to several hundred nanometers can be determined with sub-nanometer accuracy in 3D and with-in seconds of measurement time. The method opens new possibilities for research in the areas of contact mechanics, friction, wear and lubrication.
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433759/high-selectivities-among-monovalent-cations-in-dialysis-through-cation-exchange-membranes-coated-with-polyelectrolyte-multilayers
#3
Liu Yang, Chao Tang, Muhammad Ahmad, Andriy E Yaroshchuk, Merlin L Bruening
Cation-exchange membranes allow preferential passage of cations over anions, but they show minimal selectivity among cations, which limits their use in ion separations. Recent studies show that modification of cation-exchange membranes with polyelectrolyte multilayers leads to exceptional monovalent/divalent cation electrodialysis selectivities, but no studies report high selectivity among monovalent ions. This work demonstrates that adsorption of protonated poly(allylamine) (PAH)/poly(4-styrenesulfonate) (PSS) multilayers on Nafion membranes leads to high K+/Li+ selectivities in Donnan dialysis, where K+ and Li+ ions in a source phase pass through the membrane and exchange with Na+ ions in a receiving phase...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433758/fabrication-and-characterization-of-core-shell-nanofibers-using-a-next-generation-airbrush-for-biomedical-applications
#4
Ruby Singh, Farhan Ahmed, Poulomi Polley, Jyotsnendu Giri
Core-shell polymeric nanofiber, owing to its better controlled release of embedded or encapsulated drugs in contrast with the single compartment nanofibers, has been extensively studied for biomedical application such as tissue engineering and wound healing. Electrospinning with co-axial needles is the dominant technique to fabricate nanofiber mat, however, associated with potential limitations such as high voltage requirement, costly equipment, slow deposition rate, required trained personal, not suitable in-situ fabrication and direct deposition of core-shell nanofibers on the wound at patient bedside...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433755/ultra-sensitive-wearable-pressure-sensor-assembled-by-surface-patterned-polyolefin-elastomer-nanofiber-membrane-interpenetrated-with-silver-nanowires
#5
Weibing Zhong, Cui Liu, Qiongzhen Liu, Longhai Piao, Haiqing Jiang, Wen Wang, Ke Liu, Mufang Li, Gang Sun, Dong Wang
Wearable pressure sensors with ultrahigh sensitivity and flexibility have been tremendously concerned due to their abilities to mimic human somatosensory system and percept surrounding pressure distribution. Herein, an ultrasensitive pressure sensor was fabricated with surface patterned nanofibrous membranes (SPNMs) via facile replica method from available plain-weaved nylon textiles. The SPNMs were composed of internal three-dimensional (3-D) interpenetrating polyolefin elastomer (POE) nanofiber and silver nanowires (Ag NWs)...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433754/facile-activation-of-commercial-carbon-felt-as-a-low-cost-free-standing-electrode-for-flexible-supercapacitors
#6
Gaobo Lou, Yatao Wu, Xinqiang Zhu, Yingzhuo Lu, Shuai Yu, Chunhai Yang, Hao Chen, Cao Guan, Lu Li, Zhehong Shen
High cost, low capacitance, and complicated synthesis process are still the key limitations for carbon negative materials to meet their industrial production and application in high-energy-density asymmetric supercapacitors (ASCs). In this work, we demonstrate the facile preparation of ultrahigh-surface-area free-standing carbon material from low-cost industrial carbon felt (CF) and its application for flexible supercapacitor electrode with outstanding performance. Through a simple freeze-drying assisted activation method, the as-prepared activated CF (ACF) was endowed with satisfactory flexibility, ultrahigh specific surface area of 2109 m² g-1, good electric conductivity (311 S m-1), and excellent wettability to aqueous electrolyte...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433753/tailoring-the-energy-levels-and-cavity-structures-toward-organic-cocrystal-microlasers
#7
Manman Chu, Bing Qiu, Wei Zhang, Zhonghao Zhou, Xinzheng Yang, Yongli Yan, Jiannian Yao, Yong Jun Li, Yong Sheng Zhao
Organic cocrystals with unique energy-level structures are potentially a new class of materials for the development of versatile solid state lasers. But till now the stimulated emission in cocrystal materials remains a big challenge possibly due to the nonradiative charge transfer transitions. Here, for the first time, we report organic cocrystal microlasers constructed by simultaneously tailoring the energy levels and cavity structures based on the intermolecular halogen-bonding interactions. The intermolecular interactions triggered different self-assembly processes, resulting in distinct types of high-quality resonant microcavities...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433752/core-shell-transformation-imprinted-solder-bumps-enabling-low-temperature-fluidic-self-assembly-and-self-alignment-of-chips-and-high-melting-point-interconnects
#8
Mahsa Kaltwasser, Udo Schmidt, Shantonu Biswas, Johannes Reiprich, Leslie Schlag, Nishchay Angel Isaac, Thomas Stauden, Heiko O Jacobs
We demonstrate the realization of core-shell transformation-imprinted solder bumps to enable low-temperature chip assembly, while providing a route to high-temperature interconnects through transformation. The reported core-shell solder bump uses a lower melting point BiIn-based shell and a higher melting point Sn core in the initial stage. The bumps enable fluidic self-assembly and self-alignment at relatively low temperatures (60-80 °C). The bumps use the high surface free energy of the liquid shell during the self-assembly to capture freely suspended Si dies inside a heated (80 °C) water bath, leading to well-ordered defect-free chip arrays; the molten liquid shell wets the metal contact (binding site) on the chips and yields self-aligned and electrically connected devices...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30433751/the-adsorption-of-proteins-on-degradable-magnesium-which-factors-are-relevant
#9
Ruiqing Hou, Regine Willumeit-Römer, Vasil M Garamus, Marion Frant, Joachim Koll, Frank Feyerabend
Although the adsorption of proteins on Mg surface was ascribed to be the main reason for the effect of proteins on magnesium (Mg) degradation, few studies about the adsorption of proteins on Mg surface were performed due to the labile circumstance during immersion. In the present study, the adsorption of bovine serum albumin (BSA) and fibrinogen (Fib) on Mg surface during and after immersion was extensively investigated in different media for the first time. The results revealed that BSA and Fib showed a similar adsorption trend on Mg surface during and after immersion, and they adsorbed more on Mg surface in HBSS than in DMEM...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431261/triple-modal-imaging-guided-chemo-photothermal-synergistic-therapy-for-breast-cancer-with-magnetically-targeted-phase-shifted-nanoparticles
#10
Long Wang, Sijie Chen, Yun Zhu, Meixiang Zhang, Shixiong Tang, Jingyi Li, Wenjing Pei, Biying Huang, Chengcheng Niu
Current nanodrug-based cancer therapy is susceptible to the problems of rapid clearance from circulation and limited therapeutic efficacy. Herein, we report a magnetically targeted and photothermal-triggered drug release nanotheranostics system based on superparamagnetic iron oxide (Fe3O4), IR780, doxorubicin (DOX) and perfluoropentane (PFP) entrapped poly-lactide-co-glycolide (PLGA) nanoparticles (IR780/Fe3O4@PLGA/PFP/DOX NPs) for triple-modal imaging guided sysergistic therapy of breast cancer. In this work, IR780 and Fe3O4 convert light into heat, which triggers DOX release from IR780/Fe3O4@PLGA/PFP/DOX NPs and a phase-shift thermoelastic expansion of PFP; this procedure further accelerates the DOX release and tissue extrusion deformation...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431260/correlation-between-structural-changes-and-electrical-transport-properties-of-spinel-znfe2o4-nanoparticles-under-high-pressure
#11
Junkai Zhang, Yilin Zhang, Xiaoxin Wu, Yanzhang Ma, Su-Ying Chien, Renquan Guan, Dongzhou Zhang, Bin Yang, Bingmin Yan, Jinghai Yang
The structural phase transition of synthetic ZnFe2O4 nanoparticles (ZFO NPs) is investigated as a function of pressure up to 40.6 GPa at room temperature for the first time, and its associated intriguing electrical transport properties are resolved from in-situ impedance spectra and magnetoresistivity (MR) measurements. Significant anomalies are observed in the properties of the grain boundary resistance (Rgb), the relaxation frequency (fmax), and the relative permittivity (Ɛr) in the ZFO NPs under the pressures around 17...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431259/laser-induced-periodic-surface-structures-lipss-on-heavily-boron-doped-diamond-for-electrode-applications
#12
Andr Eacute Sartori, Stefano Orlando, Alessandro Bellucci, Daniele Trucchi, Shoshan Abrahami, Thijs Boehme, Thomas Hantschel, Wilfried Vandervorst, Josephus Gerardus Buijnsters
Diamond is known as a promising electrode material in the fields of cell stimulation, energy storage ( e.g. supercapacitors), (bio)sensing, catalysis, etc. However, engineering its surface and electrochemical properties often require costly and complex procedures with addition of foreign material ( e.g. carbon nanotube or polymer) scaffolds or cleanroom processing. In this work, we demonstrate a novel approach using laser-induced periodic surface structuring (LIPSS) as a scalable, versatile and cost-effective technique to nanostructure the surface and tune the electrochemical properties of boron-doped diamond (BDD)...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431258/simultaneous-and-efficient-capture-of-inorganic-nitrogen-and-heavy-metals-by-polyporous-layered-double-hydroxide-and-biochar-composite-for-agricultural-non-point-pollution-control
#13
Lixun Zhang, Shengyin Tang, Chaojin Jiang, Xiaoqian Jiang, Yuntao Guan
Agricultural non-point pollution has been recognized as the main source of aquatic contaminants worldwide, such as inorganic nitrogen (ION) and heavy metals (HMs). It is an important challenge to simultaneously and efficiently immobilize soil ION and HMs in farmland. Herein, we present a polyporous Mg/Fe-layered double hydroxide and biochar composite (Mg/Fe-LDH@biochar) with the efficient co-adsorption capacity of ION and HMs for the mitigation of agricultural non-point pollution toward aquatic systems. The Mg/Fe-LDH@biochar showed strong adsorption toward ION (i...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431257/three-dimensional-and-mesopore-oriented-graphene-conductive-framework-anchored-with-nano-li4ti5o12-particles-as-an-ultrahigh-rate-anode-for-lithium-ion-batteries
#14
Yu Xiang, Pengcheng Zhao, Zhaoqing Jin, Bo Chen, Hai Ming, Hao Zhang, Wenfeng Zhang, Gaoping Cao, Xiayu Zhu
Due to the disadvantages of commercial graphite anode for high power lithium-ion batteries, a kind of spinel nano-lithium titanate (Li4Ti5O12) /graphene microsphere composite (denoted as LTO/rGO) is successfully synthesized. The as-prepared composite is made up of curled graphene sheets which are anchored with nano-Li4Ti5O12 particles. These nano-Li4Ti5O12 particles are uniformly decorated on the conductive graphene framework and its sizes range from just 15 nm to 20 nm. In the as-prepared composite, the curled graphene sheets form unique mesopore-oriented structure which provides plenty of three-dimension channels for ions transportation...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431255/control-of-molecular-recognition-via-modulation-of-the-nano-environment
#15
Roman Kostecki, Sabrina Heng, Adrian Matthew Mak, Heike Ebendorff-Heidepriem, Tanya M Monro, Andrew D Abell
Many biological processes are driven by the interaction of a host with a guest molecule. We show such interactions can be modulated by carefully defining the local molecular environment to give a specific chemical outcome. Particularly, the selectivity of a host towards two different ions (Ca2+ and Al3+ ) is defined by it being in solution or physisorbed state. In solution the host displays greater selectivity towards Ca2+ . When physisorbed, the selectivity profile of the host is reversed with enhanced binding of Al3+ ...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431254/in-situ-synthesis-and-unprecedented-electrochemical-performance-of-double-carbon-coated-cross-linked-co3o4
#16
Ying Wang, Shijia Fan, Shengxiang Wu, Chao Wang, Zhenguo Huang, Lei Zhang
Improving the structural stability and the electron/ion diffusion rate across whole electrode particles is crucial for transition metal oxides as next-generation anodic materials in lithium ion batteries. Herein, we report a novel structure of double carbon coated Co3O4 cross-linked composite, where Co3O4 nanoparticle is in-situ covered by nitrogen-doped carbon and further connected by carbon nanotubes (Co3O4 NP@NC@CNTs). This double carbon coated Co3O4 NP@NC@CNTs framework not only endows a porous structure that can effectively accommodate the volume changes of Co3O4, but also provides multidimensional pathways for electronic/ionic diffusion in and among the Co3O4 nanoparticles...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431253/highly-fluoro-substituted-covalent-organic-framework-and-its-application-in-lithium-sulfur-battery
#17
Degao Wang, Nuo Li, Yiming Hu, Shun Wan, Min Song, Guipeng Yu, Yinghua Jin, Weifeng Wei, Kai Han, Gui-Chao Kuang, Wei Zhang
We report the preparation of a highly fluoro-substituted crystalline covalent organic framework (COF) and its application as a cathode material in lithium sulfur battery (LSB) upon sulfur confinement. A sulfur-functionalized COF with high sulfur content (60 wt%) was obtained through physisorption of elemental sulfur and subsequent SNAr reaction of sulfur with aromatic fluorides on the COF backbone. After such physical and chemical confinement of sulfur through post-functionalization approach, the COF material still shows some structural order, allowing us to investigate the structure-property relationship of such COF materials in LSB application...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431252/selective-de-cross-linking-of-transformable-double-network-hydrogels-preparation-structural-conversion-and-controlled-release
#18
Doyoung Jung, Kyoung Min Lee, Ji Young Chang, Misun Yun, Hak-Jong Choi, Yoong Ahm Kim, Hyeonseok Yoon, Hyungwoo Kim
This study has demonstrated the design of stimuli-responsive double-network hydrogels that are formed by sequential polymerisation and show chemical transformation by selective de-cross-linking without structural failure owing to chemical orthogonality. Each self-immolative and thermoresponsive network established together the double-network structure through a thiol-ene click reaction and radical polymerisation. The hydrogel exhibited enhanced mechanical strength but chemically transformed through the selective de-cross-linking of specific network triggered by a molecular stimulus, which significantly alters physical properties of the material such as tunable toughness and lower critical solution temperature (LCST) behavior...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30431251/unraveling-the-role-of-earth-abundant-fe-in-suppression-of-jahn-teller-distortion-of-p-2-type-na2-3mno2-experimental-and-theoretical-studies
#19
Jiung Choi, Yun Ji Park, Jae Hyeon Jo, Liang-Yin Kuo, Payam Kaghazchi, Seung-Taek Myung
Layered Na2/3MnO2 suffers from capacity loss due to Jahn-Teller (J-T) distortion by Mn3+ ions. Herein, density functional theory calculations suggest Na2/3[FexMn1-x]O2 suppresses the J-T effect. The Fe substitution results in a decreased oxygenmetaloxygen length, leading to decreases in the b, c lattice parameters but an increase in the a lattice constant. As a result, the capacity retention and rate capability are enhanced with additional redox pair associated with Fe4+/3+. Finally, the thermal properties are improved, with the Fe substitution delaying the exothermic reaction and reducing exothermic heat...
November 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30430834/autonomous-damage-detection-in-multilayered-coatings-via-integrated-aggregation-induced-emission-luminogens
#20
Xiaocun Lu, Wenle Li, Nancy R Sottos, Jeffrey S Moore
Detection and assessment of small-scale damage at early stages are essential for polymeric materials to extend lifetime, avoid catastrophic structural failure, and improve cost-efficiency. Previous self-reporting coatings provide visual indication of surface damage but have been limited to a single layer without information on the depth of crack penetration. Here, we present a novel strategy for autonomous indication of damage in multilayered polymeric materials using aggregation-induced emission luminogens (AIEgens)...
November 15, 2018: ACS Applied Materials & Interfaces
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