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Nanoscale

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https://www.readbyqxmd.com/read/30221647/a-water-processable-cellulose-based-resist-for-advanced-nanofabrication
#1
Camilla Dore, Johann Osmond, Agustín Mihi
The ideal nanofabrication technique is one that allows the mass production of high resolution submicrometric features in a cost efficient and environmentally friendly fashion. A great step towards achieving this goal has been the development of nanoimprinting lithography, a procedure with tenths of nanometres resolution while being compatible with roll-to-roll manufacturing. However, an ecofriendly resist that can be efficiently combined with this process is still missing. In this work, we demonstrate the use of hydroxypropyl cellulose (HPC) as a biocompatible, biodegradable, and water processable resist for temperature assisted nanoimprint lithography (tNIL) by fabricating different photonic architectures...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221295/plasmonic-targeting-of-cancer-cells-in-a-three-dimensional-natural-hydrogel
#2
Limor Minai, Matan Hamra, Dvir Yelin
Using specifically designed gold nanoparticles and local laser irradiation, individual cells and small cell clusters could be targeted on a microscopic scale with minimal toxicity to nearby tissue. To date, most scientific studies and technological demonstrations of this approach were conducted on two-dimensional cultures, while most feasibility tests and preclinical trials were conducted using animal models. For bridging the gap between two-dimensional cell cultures and animal experiments, we propose and demonstrate the use of a natural hydrogel for studying the effect of intense, ultrashort laser pulses on a gold nanoparticle targeted tissue...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221289/development-of-a-novel-fept-based-multifunctional-ferroptosis-agent-for-high-efficiency-anticancer-therapy
#3
Ludan Yue, Zhichao Dai, Xue Chen, Chunmiao Liu, Zunfu Hu, Bo Song, Xiuwen Zheng
Ferroptosis as an emerging mechanism has become a research hotspot for killing cancer cells. In this work, a novel ferroptosis agent, FePt-PTTA-Eu3+-FA (FPEF), was rationally designed by harnessing the luminescent lanthanide complexes PTTA-Eu3+ and folic acid (FA) in FePt nanoparticles. FePt-Based nanomaterials have potential applications in magnetic resonance imaging/computed tomography (MRI/CT) in clinical diagnosis and have excellent capacity to induce cancer cell death. Mechanistic studies of FPEP showed that the FePt induced cancer cell death was affirmed as the ferroptosis mechanism...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221287/correction-facile-synthesis-of-silver-nanowire-zeolitic-imidazolate-framework-67-composites-as-high-performance-bifunctional-oxygen-catalysts
#4
Mingming Zhao, Qunxing Zhao, Qing Li, Yuyin Wang, Huan Pang
Correction for 'Facile synthesis of silver nanowire-zeolitic imidazolate framework 67 composites as high-performance bifunctional oxygen catalysts' by Yuyin Wang et al., Nanoscale, 2018, 10, 15755-15762.
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221281/in-situ-formed-nanoparticle-assisted-growth-of-large-size-single-crystalline-h-bn-on-copper
#5
Man Li, Shasha Zhou, Renyan Wang, Yiwei Yu, Hoilun Wong, Zhengtang Luo, Huiqiao Li, Lin Gan, Tianyou Zhai
h-BN is a widely used ultrathin insulator that can be synthesized in a controllable manner by chemical vapor deposition, similar to the growth of graphene. However, it is challenging to grow large-size single crystalline h-BN because of the ambiguous understanding of its growth mechanism. In this study, we propose a novel in situ formed nanoparticle-assisted growth strategy for large-size single crystalline h-BN growth on conventional polycrystalline copper. We found that the areal nucleation density of h-BN can be suppressed from ∼105 nuclei per mm2 to ∼102 nuclei per mm2 by the in situ formed nanoparticles that were introduced by pre-oxidation...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221280/ultraviolet-lasing-in-zn-rich-zno-microspheres-fabricated-by-laser-ablation
#6
X X Wang, C X Xu, F F Qin, Y J Liu, A G Manohari, D T You, W Liu, F Chen, Z L Shi, Q N Cui
Zinc (Zn) surface plasmons (SPs) have been widely reported for their impressive performance in improving the optical properties of semiconductors. Zn is an effective metal with SPs response in the ultraviolet region, but the disadvantage of strong metal activity limits the application mentioned above. Here, in order to ensure the stability of metal Zn, ZnO/Zn microspheres were synthesized by an one-step laser ablation method to distribute Zn nanoparticles simultaneously on both inner and outer surfaces of ZnO microspheres...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221273/effect-of-liquid-droplet-surface-tension-on-impact-dynamics-over-hierarchical-nanostructure-surfaces
#7
Seunghyeon Baek, Hyun Sik Moon, Wuseok Kim, Sangmin Jeon, Kijung Yong
Analyzing impact dynamics is important for practical applications of superhydrophobic surfaces, because these nonwetting surfaces frequently encounter impacting liquid droplets in real environments. Thus, various studies have been conducted to investigate impact dynamics by examining the correlation between the behaviors of impacting liquid droplets and several determining parameters, such as impacting velocity, surface structure and surface energy. The impacting behaviors of pure water droplets were the main focus in most previous studies; the effect of surface tension, another critical parameter, on impact dynamics has rarely been investigated...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221270/preparation-of-long-linear-carbon-chain-inside-multi-walled-carbon-nanotubes-by-cooling-enhanced-hydrogen-arc-discharge-method
#8
Yifan Zhang, Junwei Zhao, Yanghao Fang, Yi Liu, Xinluo Zhao
Long linear carbon chains with sp hybridization inside multi-walled carbon nanotubes (LLCC@MWCNTs) can be prepared in the cathode deposits obtained by hydrogen arc discharge. In this work, a cooling system was introduced into the hydrogen arc discharge method to improve the growth yield of LLCC@MWCNTs samples, as indicated by the corresponding stronger Raman peaks between 1780 cm-1 and 1880 cm-1, compared with conventional systems. Moreover, the cooling largely expanded the narrow scope of suitable conditions for the preparation of LLCC@MWCNTs, and high purity samples were easily produced...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221268/a-novel-speek-nanocomposite-membrane-with-well-controlled-sposs-aggregation-in-tunable-nanochannels-for-fast-proton-conduction
#9
Sang-Woo Kim, Seung-Young Choi, Hee-Woo Rhee
To greatly increase the proton conductivity of a sPEEK nanocomposite membrane without water swelling problems, sulfonated PEEK (sPEEK) nanocomposite membranes were prepared by regulating the nanocomposite concentration of sulfonated POSS (sPOSS). Incorporation of sPOSS into sPEEK afforded a 39% increase in proton conductivity at 80 °C/100% RH and a 70% increase in cell performance at 1.5 wt% sPOSS concentration. In particular, water swelling problems were not observed even with the attained proton conductivity, as with Nafion...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221265/nitrogen-substitution-improves-the-mobility-and-stability-of-electron-transport-materials-for-inverted-perovskite-solar-cells
#10
Rui Zhu, Quan-Song Li, Ze-Sheng Li
A suitable electron transport material (ETM) plays key roles in efficient perovskite solar cells (PSCs), because it is beneficial for exciton dissociation and charge transport at the interface thus increasing the short circuit current density. Based on the experimentally reported efficient electron transport molecule 10,14-bis(5-(2-ethylhexyl)thiophen-2-yl)-dipyrido[3,2-a:2',3'-c][1,2,5]thiadiazolo[3,4-i]phenazine (TDTP), we theoretically design a set of new ETMs (TDTP-1, TDTP-2a, TDTP-2b, TDTP-3a, and TDTP-3b) by introducing a nitrogen atom into the thiophene ring or replacing a hydrogen atom on the methyl with an amino group...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221263/fluorescent-and-photoacoustic-bifunctional-probe-for-the-detection-of-ascorbic-acid-in-biological-fluids-living-cells-and-in-vivo
#11
Wenxiang Xu, Jingqin Chen, Shan Sun, Zhongdi Tang, Kai Jiang, Liang Song, Yuhui Wang, Chengbo Liu, Hengwei Lin
Photoacoustic imaging (PAI) has emerged as a promising clinical technology, thanks to its high-resolution in deep tissues. However, the lack of specificity towards analytes limits further application of the PA probe in molecular imaging. To this end, we herein report a PA and fluorescence (FL) dual-modal probe for the selective detection of ascorbic acid (AA). To realize this design, cobalt oxyhydroxide (CoOOH) was adopted as a multifunctional platform (PA contrast agent, FL quencher and specific oxidant to AA) and hybridized with red-emissive carbon dots (RCDs)...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221262/singlet-fission-in-self-assembled-pdi-nanocrystals
#12
Christoph Schierl, Angelica Niazov-Elkan, Linda J W Shimon, Yishay Feldman, Boris Rybtchinski, Dirk M Guldi
Upon photoexcitation, self-assembled PDI nanocrystals (S1S0) in the form of rods of 70 nm width and 1 μm length are subject to a symmetry breaking charge separation (SBCS) as the first step in the singlet fission (SF) sequence. Hereby, the correlated pair of triplet excited states 1(T1T1) is formed with a quantum yield of 122%. Decoherence and triplet diffusion within the nanocrystals affords a long-lived, uncorrelated pair of triplet excited states (T1 + T1) with a quantum yield of 24%.
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30221261/high-energy-flexible-quasi-solid-state-lithium-ion-capacitors-enabled-by-a-freestanding-rgo-encapsulated-fe-3-o-4-nanocube-anode-and-a-holey-rgo-film-cathode
#13
Tian Liang, Huanwen Wang, Dongming Xu, Ke Liao, Rui Wang, Beibei He, Yansheng Gong, Chunjie Yan
Flexible energy storage devices have become critical components for next-generation portable electronics. In the present work, a flexible quasi-solid-state lithium-ion capacitor (LIC) is developed based on graphene-based bendable freestanding films in a gel polymer electrolyte. A graphene encapsulated Fe3O4 nanocube hybrid film (rGO@Fe3O4) has been fabricated as the anode of LICs through a filtration assisted self-assembly and the subsequent thermal annealing process. In this hybrid architecture, flexible and ultrathin graphene shells uniformly enwrap the Fe3O4 within the whole film, which can effectively suppress the aggregation of Fe3O4 and also accommodate the volume change of Fe3O4 during the cycling process...
September 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30215661/manipulating-the-crystal-structure-of-a-conjugated-polymer-for-efficient-sequentially-processed-organic-solar-cells
#14
Ahra Yi, Sangmin Chae, Seungyeon Hong, Hyun Hwi Lee, Hyo Jung Kim
Recently, the sequential (Sq) process, which forms nanoscale network structures from quasi-solid-state inter-diffusion through swelling and annealing, is considered to be one of the most efficient methods for fabricating organic solar cells and blend films. Here, we examined the effect of the crystallinity and orientation of poly(3-hexylthiophene) (P3HT) molecules on the formation of the nanostructure by carrying out a Sq process using various solvents with different boiling points. We showed that the moderate crystallinity promoted suitable inter-diffusion between the donor (P3HT) and acceptor ([6,6]-pentadeuterophenyl C61 butyric acid methyl ester, PC60BM), and hence was important for achieving high-performance solar cells using Sq processing...
September 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/30215658/unusual-strain-dependent-thermal-conductivity-modulation-of-silver-nanoflower-polyurethane-fibers
#15
Agha Aamir Jan, Daewoo Suh, Seonghyun Bae, Seunghyun Baik
Thermal management of stretchable and wearable electronic devices is an important issue in enhancing performance, reliability, and human thermal comfort. Here, we constructed a unique experimental setup which investigated the strain-dependent thermal conductivity. The thermal conductivity of flower-shaped silver nanoparticle (silver nanoflower)-polyurethane (Ag-PU) composite fibers was systematically investigated as a function of strain. The strain-dependent temperature distribution of the Joule-heated fiber was measured using an infrared camera, and the thermal conductivity was obtained from the 1-dimensional Fourier's conduction model...
September 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/30215650/lactoferrin-conjugated-ph-and-redox-sensitive-polymersomes-based-on-peg-s-s-pla-pcl-oh-boost-delivery-of-bacosides-to-the-brain
#16
Kritika Goyal, Arpita Konar, B S Hemanth Kumar, Veena Koul
In the present study, engineered lactoferrin (Lf)-conjugated pH and redox-sensitive polymersomes derived from the triblock copolymer polyethylene glycol-S-S-polylactic acid-polycaprolactone (PEG-S-S-PLA-PCL-OH) have been used to deliver bacosides to the brain. Bacosides are classified as triterpenoid saponins and are used in Indian Ayurveda for reversal of amnesia; however, no study has extensively demonstrated their efficacy as a nano-formulation in an animal model. The polymer was synthesized by ring opening polymerization of lactide and ε-caprolactone...
September 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/30215442/rare-earth-doped-fluoride-nanoparticles-with-engineered-long-luminescence-lifetime-for-time-gated-in-vivo-optical-imaging-in-the-second-biological-window
#17
Meiling Tan, Blanca Del Rosal, Yuqi Zhang, Emma Martín Rodríguez, Jie Hu, Zhigang Zhou, Rongwei Fan, Dirk H Ortgies, Nuria Fernández, Irene Chaves-Coira, Ángel Núñez, Daniel Jaque, Guanying Chen
Biomedicine is continuously demanding new luminescent materials to be used as optical probes for the acquisition of high resolution, high contrast and high penetration in vivo images. These materials, in combination with advanced techniques, could constitute the first step towards new diagnosis and therapy tools. In this work, we report on the synthesis of long lifetime rare-earth-doped fluoride nanoparticles by adopting different strategies: core/shell and dopant engineering. The here developed nanoparticles show intense infrared emission in the second biological window with a long luminescence lifetime close to 1 millisecond...
September 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/30215088/mercury-ion-dna-specificity-triggers-a-distinctive-photoluminescence-depression-in-organic-semiconductor-probes-guided-with-a-thymine-rich-oligonucleotide-sequence
#18
Jietao Huang, Jin Hyuk Park, Seung Hyuk Back, Yuhui Feng, Chunzhi Cui, Long Yi Jin, Dong June Ahn
DNA strands have been recently found to play a role in crystallizing organic semiconductors as a substitute for conventional surfactants. Such DNA-guided organic semiconductor particles possessed the recognition ability to complementary target DNAs, resulting in "enhanced luminescence" due to the lesser degree of non-radiative dissipation. Apart from this, in this study we developed selective recognition of mercury ions by utilizing DNA probes having ion-specific thymine-rich motifs. Strikingly, the specific ion-DNA interaction triggered rather distinctive "depressed luminescence" emitting from the particles...
September 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/30215080/magnetic-nanoparticles-loaded-with-functional-rna-nanoparticles
#19
Melissa Cruz-Acuña, Justin R Halman, Kirill A Afonin, Jon Dobson, Carlos Rinaldi
RNA is now widely acknowledged not only as a multifunctional biopolymer but also as a dynamic material for constructing nanostructures with various biological functions. Programmable RNA nanoparticles (NPs) allow precise control over their formulation and activation of multiple functionalities, with the potential to self-assemble in biological systems. These attributes make them attractive for drug delivery and therapeutic applications. In the present study, we demonstrate the ability of iron oxide magnetic nanoparticles (MNPs) to deliver different types of RNA NPs functionalized with dicer substrate RNAs inside human cells...
September 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/30211430/self-assembly-of-clay-nanotubes-on-hair-surface-for-medical-and-cosmetic-formulations
#20
Abhishek Panchal, Gölnur Fakhrullina, Rawil Fakhrullin, Yuri Lvov
While most hair care formulations are developed on the basis of surfactants or polymers, we introduce self-assembly coating of micro and nanoparticles as the underlying principle for hair modification, protection and enhancement. Halloysite clay nanotubes formed by rolled sheets of aluminosilicate kaolin assemble on the surface of hair forming a robust multilayer coverage. Prior to the application, clay nanotubes were loaded with selected dyes or drug allowing for hair coloring or medical treatment. This facile process is based on a 3-minute application of 1 wt% aqueous dispersion of color/drug loaded halloysite resulting in a ca...
September 13, 2018: Nanoscale
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