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Nanoscale

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https://www.readbyqxmd.com/read/30657518/quench-resistant-and-stable-nanocarbon-dot-sheet-emitters-with-tunable-solid-state-fluorescence-via-aggregation-induced-color-switching
#1
Qing Chang, Yamei Ding, Shuai Cheng, Wei Shen, Zhe Zhou, Yuhang Yin, Tao Sun, Chaoyi Ban, Zhengtao Deng, Juqing Liu, Fei Xiu, Wei Huang
Nanocarbon fluorescence materials are promising color converters for multicolor emission via phosphor-coated light emitting devices (LEDs). Herein, a facile time-controlled solvothermal route was developed to prepare solid-state multicolor nanocarbon emitters comprising dot/sheet nanohybrids. The nanocarbons demonstrate an aggregation-induced color switching behavior, leading to tunable light emission from blue to yellow by modulating the solvothermal reaction time. Particularly, these emitters show outstanding film-forming ability directly and a high production yield (∼40%)...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30657514/technology-driven-layer-by-layer-assembly-of-a-membrane-for-selective-separation-of-monovalent-anions-and-antifouling
#2
Yan Zhao, Congjie Gao, Bart Van der Bruggen
Selective separation of monovalent anions with reduced fouling is one of the major challenges for anion exchange membranes (AEM) in electrodialysis (ED). In this research, an alternating current layer-by-layer (AC∼LbL) assembly technology was first proposed and then applied to the construction of a durable multilayer with the selective separation of monovalent anions with reduced fouling. Under an alternating current (AC) electric field, the hydrophilic poly(4-styrenesulfonic acid-co-maleic acid) sodium salt and 2-hydroxypropyltrimethyl ammonium chloride chitosan were homogenized and rapidly assembled on a commercial original AEM and then crosslinked using 1,4-bis(2',3'-epoxypropyl) perfluoro-1-butane...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30657513/ultralight-superelastic-and-bendable-lashing-structured-nanofibrous-aerogels-for-effective-sound-absorption
#3
Leitao Cao, Yang Si, Yuanyuan Wu, Xueqin Wang, Jianyong Yu, Bin Ding
Low-density nanofibrous aerogels enable various applications but are often hindered by their fragile bendability and poor tensile strength. Herein, we report a strategy to design nanofibrous aerogels with robust bendability and superelastic property, which has been achieved by fabricating bamboo lashing-like structures through a freeze-drying method. The obtained reinforced nanofibrous aerogels (RNFAs) can maintain their structural integrity after 100 bending-recovery cycles at a bending angle of about 100°...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30657512/growth-and-optical-properties-of-zno-zn-1-x-mg-x-o-quantum-wells-on-zno-microrods
#4
Agnieszka Pieniążek, Henryk Teisseyre, Dawid Jarosz, Jan Suffczyński, Bartłomiej S Witkowski, Sławomir Kret, Michał Boćkowski, Anna Reszka, Marek Godlewski, Adrian Kozanecki, Bogdan J Kowalski
While synthesis methods for pure ZnO nanostructures are well established, an efficient technique for the growth of ZnO-based nanowires or microrods that incorporate any type of quantum structure is yet to be established. Here, we report on the fabrication and optical properties of axial Zn1-xMgxO/ZnO/Zn1-xMgxO quantum wells that were deposited by molecular beam epitaxy on ZnO microrods obtained using a hydrothermal method. Using the emission energy results found in cathodoluminescence measurements and the results of a numerical modeling process, we found the quantum well width to be 4 nm, as intended, at the growth stage...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30657510/high-throughput-3d-visualization-of-nanoparticles-attached-to-the-surface-of-red-blood-cells
#5
André Dias, Marco Werner, Kevin R Ward, Jean-Baptiste Fleury, Vladimir A Baulin
Blood circulation is the main distribution route for systemic delivery and the possibility to manipulate red blood cells (RBCs) by attaching nanoparticles to their surface provides a great opportunity for cargo delivery into tissues. Nanocarriers attached to RBCs can be delivered to specific organs orders of magnitude faster than if injected directly into the bloodstream. Another advantage is a shielding from recognition by the immune system, thereby increasing the efficiency of delivery. We present a high-throughput microfluidic method that can monitor the shape of drifting cells due to interactions with nanoparticles and characterize the 3D dispersion of fluorescent silica nanoparticles at the surface of RBCs...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656330/tough-and-electro-responsive-hydrogel-actuators-with-bidirectional-bending-behavior
#6
Haoyang Jiang, Lixia Fan, Shuang Yan, Feibo Li, Huanjun Li, Jianguo Tang
Electro-responsive hydrogel actuators have gained much attention because of their fast response, low power consumption and easy modulation. However, such hydrogel actuators suffer from poor mechanical properties and restricted bending direction, which limit their practical applications. Herein, we report a nanocomposite hydrogel actuator with a combination of high mechanical tensile strength (2 MPa) and automatic bidirectional bending behavior in response to electric signals. The resulting hydrogel, crosslinked by aluminum hydroxide nanoparticles, shows rapid bending behavior and could be cyclically actuated up to ten times in an electric field...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656329/quantum-3d-thermal-imaging-at-the-micro-nanoscale
#7
Jun Yang, Ben Q Li, Rongheng Li, Xuesong Mei
Real-time and accurate measurement of three-dimensional (3D) temperature field gradient maps of cells and tissues would provide an effective experimental method for analyzing the coupled correlation between metabolism and heat, as well as exploring the thermodynamic properties of nanoparticles under complex environments. In this work, a new principle of quantum 3D thermal imaging is proposed. The photoluminescence principle of quantum dots is expounded and CdTe QDs are prepared by aqueous phase synthesis. Fluorescence spectral characteristics of QDs at different temperatures are studied...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656328/perfluoroarene-induces-a-pentapeptidic-hydrotrope-into-a-ph-tolerant-hydrogel-allowing-naked-eye-sensing-of-ca-2-ions
#8
Bappa Maiti, Subham Bhattacharjee, Santanu Bhattacharya
Self-assembly of a novel thermoresponsive, pyrene-appended oligopeptide sequence VPGKP (PyP) leads to the formation of spherical aggregates in water. The sizes of the globular aggregates of the peptide, PyP, strongly depend on the temperature of its suspension in water and decrease with the decrease in temperature showing a lower critical solution temperature (LCST) phenomenon. Furthermore, a pyrene-octafluoronaphthalene (OFN) 'pair' has been used as a supramolecular synthon to induce hydrogelation of PyP in the presence of an equimolar amount of OFN via complementary quadrupole-quadrupole interactions...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656325/realizing-a-highly-luminescent-perovskite-thin-film-by-controlling-the-grain-size-and-crystallinity-through-solvent-vapour-annealing
#9
Sang-Hyun Chin, Jin Woo Choi, Hee Chul Woo, Jong H Kim, Hong Seok Lee, Chang-Lyoul Lee
Organometallic halide perovskite films were treated with novel facile solvent vapour annealing to control crystal grain size as well as the crystallinity of perovskite. As both polarity and vapour pressure of the treatment solvent for perovskite increase, luminance increases and the wavelength of the photoluminescence emission peak decreases due to enhanced crystallinity and reduced grain size.
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656324/flexible-artificial-nociceptor-using-a-biopolymer-based-forming-free-memristor
#10
Jun Ge, Shan Zhang, Zhiyu Liu, Zhikun Xie, Shusheng Pan
The development of electronic devices possessing the functionality of a nociceptor is a crucial step toward electronic receptors that can transfer the external stimuli to the internal nerve system. Of the various materials that have been used to realize artificial nociceptors, biopolymers have the advantages of being abundant, inexpensive, biocompatible, and flexible. In this study, nociceptor behaviors are demonstrated by the flexible Ag/carboxymethyl ι-carrageenan/ITO/PET forming-free memristors for the electronic receptors...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656322/a-sensitive-and-selective-electroanalysis-strategy-for-histidine-using-the-wettable-well-electrodes-modified-with-graphene-quantum-dot-scaffolded-melamine-and-copper-nanocomposites
#11
Yue Hua, Shuai Li, Yuanyuan Cai, Huan Liu, Yuqi Wan, Mengyuan Yin, Fengxiang Wang, Hua Wang
A wettable well was fabricated on an electrode, which was further modified with carbon quantum dot-scaffolded nanocomposites of melamine and copper for probing histidine through a unique displacement reaction route. The developed electrode with wettable well enables the condensing enrichment of analytes from the sample droplets, improving the electroanalytical sensitivity.
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656317/a-novel-mosaic-type-nanoparticle-for-selective-drug-release-targeting-hypoxic-cancer-cells
#12
Weiwei Wang, Xiangyun Li, Zhaohong Wang, Jinfu Zhang, Xiao Dong, Yunzhao Wu, Chao Fang, Aiwu Zhou, Yingli Wu
The surface potential of particles is a double-edged sword for nanomedicine. The negative charge can protect nanoparticles from clearance before they reach the tumor tissue; however, it is difficult to phagocytose the negative particles by target cells due to the negative potential of the cytomembrane. Preparing techniques to efficiently release the encapsulated drug from negative nanoparticles into target cells is a formidable challenge facing advanced drug delivery studies. Herein, we have developed a novel "mosaic-type" nanoparticle system (GA-Cy7-NP) for selective drug release targeting hypoxic cancer cells...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30656311/direct-conversion-of-carbon-nanofibers-and-nanotubes-into-diamond-nanofibers-and-the-subsequent-growth-of-large-sized-diamonds
#13
J Narayan, A Bhaumik, R Sachan, A Haque, S Gupta, P Pant
We report a pulsed laser annealing method to convert carbon fibers and nanotubes into diamond fibers at ambient temperature and pressure in air. The conversion of carbon nanofibers and nanotubes into diamond nanofibers involves melting in a super undercooled state using nanosecond laser pulses, and quenching rapidly to convert into phase-pure diamond. The conversion process occurs at ambient temperature and pressure, and can be carried out in air. The structure of diamond fibers has been confirmed by selected-area electron diffraction in transmission electron microscopy, electron-back-scatter-diffraction in high-resolution scanning electron microscopy, all showing characteristic diffraction lines for the diamond structure...
January 18, 2019: Nanoscale
https://www.readbyqxmd.com/read/30648721/porous-liquid-zeolites-hydrogen-bonding-stabilized-h-zsm-5-in-branched-ionic-liquids
#14
Peipei Li, Hao Chen, Jennifer A Schott, Bo Li, Yaping Zheng, Shannon M Mahurin, De-En Jiang, Guokai Cui, Xunxiang Hu, Yangyang Wang, Lengwan Li, Sheng Dai
Porous liquids, as a newly emerging type of porous material, have great potential in gas separation and storage. However, the examples and synthetic strategies reported so far likely represent only the tip of the iceberg due to the great difficulty and challenge in engineering permanent porosity in liquid matrices. Here, by taking advantage of the hydrogen bonding interaction between the alkane chains of branched ionic liquids and the Brønsted sites in H-form zeolites, as well as the mechanical bond of the long alkyl chain of the cation penetrated into the zeolite channel at the interface, the H-form zeolites can be uniformly stabilized in branched ionic liquids to form porous liquid zeolites, which not only significantly improve their gas sorption performance, but also change the gas sorption-desorption behavior because of the preserved permanent porosity...
January 16, 2019: Nanoscale
https://www.readbyqxmd.com/read/30648720/towards-multiplexed-near-infrared-cellular-imaging-using-gold-nanostar-arrays-with-tunable-fluorescence-enhancement
#15
Ioannis G Theodorou, Pakatip Ruenraroengsak, Daniel A Gonzalez-Carter, Qianfan Jiang, Ernesto Yagüe, Eric O Aboagye, R Charles Coombes, Alexandra E Porter, Mary P Ryan, Fang Xie
Sensitive detection of disease biomarkers expressed by human cells is critical to the development of novel diagnostic and therapeutic methods. Here we report that plasmonic arrays based on gold nanostar (AuNS) monolayers enable up to 19-fold fluorescence enhancement for cellular imaging in the near-infrared (NIR) biological window, allowing the application of low quantum yield fluorophores for sensitive cellular imaging. The high fluorescence enhancement together with low autofluorescence interference in this wavelength range enable higher signal-to-noise ratio compared to other diagnostic modalities...
January 16, 2019: Nanoscale
https://www.readbyqxmd.com/read/30644964/site-selective-growth-of-ag-nanoparticles-controlled-by-localized-surface-plasmon-resonance-of-nanobowl-arrays
#16
Aonan Zhu, Renxian Gao, Xiaoyu Zhao, Fan Zhang, Xinyuan Zhang, Jinghai Yang, Yongjun Zhang, Lei Chen, Yaxin Wang
Hexagonal Ag nanoparticle arrays are exclusively grown on top of the interstices of Au nanobowl arrays. The photoinduced effect of the enhanced electromagnetic field between Au nanobowls accelerated the chemical reaction and is responsible for Ag growth in defined local positions. The enhanced electric field of the Au nanobowl array induced a photoreaction, which resulted in Ag growth in the hot area. Interestingly, the sizes and positions of the Ag nanoparticles distributed in the strong electric field of the Au nanobowl array are easily controlled...
January 15, 2019: Nanoscale
https://www.readbyqxmd.com/read/30644963/fast-upconversion-super-resolution-microscopy-with-10-%C3%AE-s-per-pixel-dwell-times
#17
Xingyun Peng, Bingru Huang, Rui Pu, Haichun Liu, Tao Zhang, Jerker Widengren, Qiuqiang Zhan, Hans Ågren
Multi-photon upconversion super-resolution microscopy is a recently proposed imaging modality, based on lanthanide-doped nanocrystals, which can emit visible emission upon low-intensity near-infrared excitation. This imaging modality exhibits many advantages, including increased imaging depth, high signal-to-noise ratio, low phototoxicity, and high photostability. However, two factors seriously restrict its scanning speed, sometimes even to an intolerable degree; the long lanthanide emission lifetime and the low brightness...
January 15, 2019: Nanoscale
https://www.readbyqxmd.com/read/30644961/resonant-spin-wave-excitation-in-magnetoplasmonic-bilayers-using-short-laser-pulses
#18
Stanislav Kolodny, Dmitry Yudin, Ivan Iorsh
In magnetically ordered solids a static magnetic field can be generated by virtue of the transverse magneto-optical Kerr effect (TMOKE). Moreover, the latter was shown to be dramatically enhanced due to the optical excitation of surface plasmons in nanostructures with relatively small optical losses. In this paper we suggest a new method for resonant optical excitation in a prototypical bilayer composed of a noble metal (Au) with grating and a ferromagnetic thin film of yttrium iron garnet (YIG) via a frequency comb...
January 15, 2019: Nanoscale
https://www.readbyqxmd.com/read/30644959/enhancing-the-photocatalytic-properties-of-pbs-qd-solids-the-ligand-exchange-approach
#19
Rafael Abargues, Juan Navarro, Pedro J Rodríguez-Cantó, Alberto Maulu, Juan F Sánchez-Royo, Juan P Martínez-Pastor
Surface engineering of nanomaterials is a promising tool towards the design of new materials for conversion of solar energy into chemical energy. In this work, we examine the influence of ligand exchange on the photocatalytic performance of solution-processed PbS films. We test different ligands such as oleylamine (OAm), 1,2-ethanedithiol (EDT), 3-mercaptopropionic acid (MPA) and tetrabutylammonium iodide (TBAI). The study demonstrates that PbS films capped with MPA and EDT exhibit 3.5-fold enhanced photocatalytic performance for the photodecomposition of methyl orange upon sunlight exposure...
January 15, 2019: Nanoscale
https://www.readbyqxmd.com/read/30644958/membrane-potential-drives-direct-translocation-of-cell-penetrating-peptides
#20
Xinli Gao, Song Hong, Zhiping Liu, Tongtao Yue, Jure Dobnikar, Xianren Zhang
Cell-penetrating peptides (CPPs) are frequently employed as drug delivery agents with rapid cellular uptake, however, the uptake mechanism and the detailed translocation pathway are at present not completely understood. Both endocytosis and direct translocation through membrane pores have been observed in experiments and simulations under different conditions. Here we report the molecular dynamics simulations providing evidence for the direct translocation of CPPs across the membrane driven by the membrane electrostatic potential...
January 15, 2019: Nanoscale
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