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ACS Nano

Yunfei Bu, Ohhun Gwon, Gyutae Nam, Haeseong Jang, Seona Kim, Qin Zhong, Jaephil Cho, Guntae Kim
Of the various catalysts that have been developed to date for high performance and low cost, perovskite oxides have attracted the attention due to their inherent catalytic activity as well as structural and structural flexibility. Especially, high amount of Pr substitution of the cation ordered perovskite oxide originated from the state-of-the-art Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) electrode could be a good electrode or catalyst because of its high oxygen kinetics, electrical conductivity, oxygen capacity and structural stability...
October 19, 2017: ACS Nano
Bin Ai, Zengyao Wang, Helmuth Möhwald, Gang Zhang
We show that the growth of Ag nanoparticles (NPs) follows the areas of maximum plasmonic field in nanohole arrays (NAs). We thus obtain Ag NP rings not connected to the metallic rim of the nanoholes. The photocatalytic effect resulting from the enhanced E-field of NAs boosts the reaction and is responsible for the site-selectivity. The strategy, using plasmonics to control a chemical reaction, can be expanded to organic reactions, e.g., synthesis of polypyrrole. After removing the NA film, ordered ring-shaped Ag NPs are easily obtained, inspiring a facile micropatterning method...
October 19, 2017: ACS Nano
Néstor Merino-Díez, Aran Garcia-Lekue, Eduard Carbonell-Sanromà, Jingcheng Li, Martina Corso, Luciano Colazzo, Francesco Sedona, Daniel Sánchez-Portal, Jose Ignacio Pascual, Dimas G de Oteyza
We report on the energy level alignment evolution of valence and conduction bands of armchair-oriented graphene nanoribbons (aGNR) as their band gap shrinks with increasing width. We use 4,4''-dibromo-para-terphenyl as molecular precursor on Au(111) to form extended poly-para-phenylene nanowires, which can be fused sideways to form atomically precise aGNRs of varying widths. We measure the frontier bands by means of scanning tunneling spectroscopy, corroborating that the nanoribbon's band gap is inversely proportional to their width...
October 19, 2017: ACS Nano
Xiujuan Wang, Kai Chen, Gang Wang, Xiaojie Liu, Hui Wang
Transition metal phosphides (TMPs) have been extensively investigated owing to their high theoretical capacities and relatively low intercalation potentials vs. Li/Li+, but their practical applications have been hindered by low electrical conductivity and dramatic volume variation during cycling. In this work, an interesting strategy for rational design of graphene (GR) encapsulated with hollow FeP@carbon nanocomposite (H-FeP@C@GR) via a combination of hydrothermal route, carbon coating process, phosphidation treatment, and carbothermic reaction is reported...
October 19, 2017: ACS Nano
Jun Li, Lei Tan, Xiangmei Liu, Zhenduo Cui, Xianjin Yang, Kelvin Wai Kwok Yeung, Paul K Chu, Shuilin Wu
Bacterial infection and lack of bone tissue integration are two major concerns of orthopedic implants. In addition, osteoinductivity often decreases and toxicity may arise when antibacterial agents are introduced to increase the antibacterial ability. Here hybrid ZnO/polydopamine (PDA)/arginine-glycine-aspartic acid-cysteine (RGDC) nanorod (NR) arrays are designed and prepared on titanium (Ti) implants to not only enhance the osteoinductivity but also effectively kill bacteria simultaneously, which are ascribed to the selective physical puncture and the biofunctionalization of ZnO/PDA/RGDC nanorods during the competition between bacteria and osteoblasts, that is, owing to the much larger size of osteoblasts than bacteria, the hybrid NRs can puncture bacteria but not damage osteoblasts...
October 19, 2017: ACS Nano
Zheyu Shen, Tianxiang Chen, Xuehua Ma, Wenzhi Ren, Zijian Zhou, Guizhi Zhu, Ariel Zhang, Yijing Liu, Jibin Song, Zihou Li, Huimin Ruan, Wenpei Fan, Lisen Lin, Jeeva Munasinghe, Xiaoyuan Chen, Aiguo Wu
The recently emerged exceedingly small magnetic iron oxide nanoparticles (ES-MIONs) (<5 nm) are promising T1-weighted contrast agents for magnetic resonance imaging (MRI) due to their good biocompatibility compared with Gd-chelates. However, the best particle size of ES-MIONs for T1 imaging is still unknown because the synthesis of ES-MIONs with precise size control to clarify the relationship between the r1 (or r2/r1) and the particle size remains a challenge. In this study, we synthesized ES-MIONs with seven different sizes below 5 nm and found that 3...
October 19, 2017: ACS Nano
Bin Feng, Nathan R Lugg, Akihito Kumamoto, Yuichi Ikuhara, Naoya Shibata
Crystalline interfaces in materials often govern the macroscopic functional properties owing to their complex structure and chemical inhomogeneity. For ionic crystals, however, such understanding has been precluded by the debatable local anion distribution across crystal interfaces. In this study, using yttria-stabilized zirconia as a model material, the oxygen vacancy distribution across individual grain boundaries was directly quantified by atomic-resolution scanning transmission electron microscopy with ultrahigh-sensitive energy-dispersive X-ray spectroscopy...
October 19, 2017: ACS Nano
Catherine A Fromen, William J Kelley, Margaret B Fish, Reheman Adili, Jeffery Noble, Mark J Hoenerhoff, Michael Holinstat, Omolola Eniola-Adefeso
Although nano- and microparticle therapeutics have been studied for a range of drug delivery applications, the presence of these particles in blood flow may have considerable and understudied consequences to circulating leukocytes, especially neutrophils, which are the largest human leukocyte population. The objective of this work was to establish if particulate drug carriers in circulation interfere with normal neutrophil adhesion and migration. Circulating blood neutrophils in vivo were found to be capable of rapidly binding and sequestering injected carboxylate-modified particles of both 2 and 0...
October 19, 2017: ACS Nano
Ernest Y Lee, Toshiya Takahashi, Tine Curk, Jure Dobnikar, Richard L Gallo, Gerard C L Wong
Double-stranded RNA (dsRNA) induces production of pro-inflammatory cytokines in normal human epidermal keratinocytes (NHEK) by specific binding to endosomal Toll-like receptor-3 (TLR3). Recently, it has been shown that hyperactivation of TLR3 in psoriatic keratinocytes by dsRNA can occur in the presence of human antimicrobial peptide (AMP) LL37. Here, we combine synchrotron X-ray scattering, microscopy, computer simulations, and measurements of NHEK cytokine production to elucidate a previously unanticipated form of specific molecular pattern recognition...
October 19, 2017: ACS Nano
Junjie Si, Yang Liu, Zhuofei He, Hui Du, Kai Du, Dong Chen, Jing Li, Mengmeng Xu, He Tian, Haiping He, Dawei Di, Changqing Lin, Yingchun Cheng, Jianpu Wang, Yizheng Jin
We report a facile solution-based approach to the in-situ growth of perovskite films consisting of monolayers of CsPbBr3 nanoplates passivated by bulky phenylbutylammonium (PBA) cations, i.e. two-dimensional layered PBA2(CsPbBr3)n-1PbBr4 perovskites. Optimizing film-formation processes leads to layered perovskites with controlled n values in the range of 12-16. The layered perovskite emitters show quantum-confined bandgap energies with a narrow distribution, suggesting the formation of thickness-controlled quantum-well (TCQW) structures...
October 18, 2017: ACS Nano
Fulvio Grigolato, Claudio Colombo, Raffaele Ferrari, Lenka Rezabkova, Paolo Arosio
Interactions between proteins and surfaces in combination with hydrodynamic flow and mechanical agitation can often trigger the conversion of soluble peptides and proteins into aggregates, including amyloid fibrils. Despite the extensive literature on the empirical effects of surfaces and mechanical forces on the formation of amyloids, the molecular details of the mechanisms underlying this behavior are still elusive. This limitation is, in part, due to the complex reaction network underlying the formation of amyloids, where several microscopic reactions of nucleation and growth can occur both at the interfaces and in bulk...
October 18, 2017: ACS Nano
Feng Chen, Min Bai, Ke Cao, Yue Zhao, Xiaowen Cao, Jing Wei, Na Wu, Jiang Li, Lihua Wang, Chunhai Fan, Yongxi Zhao
Molecular nanodevices are computational assemblers that switch defined states upon external stimulation. However, interfacing artificial nanodevices with natural molecular machineries in living cells remains a great challenge. Here we delineate a generic method for programming assembly of enzyme-initiated DNAzyme nanodevices (DzNanos). Two programs including split assembly of two partzymes and toehold-exchange displacement assembly of one intact DNAzyme initiated by telomerase are computed. The intact one obtains higher assembly yield and catalytic performance ascribed to proper conformation folding and active misplaced assembly...
October 18, 2017: ACS Nano
Luis Estevez, Venkateshkumar Prabhakaran, Adam L Garcia, Yongsoon Shin, Jinhui Tao, Ashleigh M Schwarz, Jens Darsell, Priyanka Bhattacharya, Vaithiyalingam Shutthanandan, Ji-Guang Zhang
Developing hierarchical porous carbon (HPC) materials with competing textural characteristics such as surface area and pore volume in one material is difficult to accomplish-particularly for an atomically ordered graphitic carbon. Herein we describe a synthesis strategy to engineer tunable HPC materials across micro- meso- and macroporous length scales, allowing the fabrication of a graphitic HPC material (HPC-G) with both very high surface area (>2500 m(2)/g) and pore volume (>11 cm(3)/g), the combination of which has not been attained previously...
October 18, 2017: ACS Nano
Yijuan Li, Jingmin Fan, Jinhua Zhang, Jingfang Yang, Ru Ming Yuan, Jeng-Kuei Chang, Ming Sen Zheng, Quan Feng Dong
Because of the high theoretical capacity of 1675 mAh g-1 and high energy density of 2600 Wh kg-1, respectively, lithium-sulfur batteries are attracting intense interest. However, it remains an enormous challenge to realize high utilizations and loadings of sulfur in cathode for the practical applications of Li-S batteries. Herein, we design a quasi-2D Co@N-C composite with honeycomb architecture as multi-functional sulfur host via a simple sacrificial templates method. The cellular flake with large surface area and honeycomb architecture can encapsulate much more sulfur leading to high sulfur content (HSC) composites, and by stacking these HSC flakes, a high sulfur loading (HSL) electrode can be realized due to their high layer bulk density...
October 18, 2017: ACS Nano
James I Griffin, Guankui Wang, Weston J Smith, Vivian P Vu, Robert Scheinman, Dominik Stitch, Radu Moldovan, Seyed Moein Moghimi, Dmitri Simberg
Accumulation of intravenously injected cytotoxic liposomes in the skin induces serious toxicity. We used single time point and longitudinal intravital microscopy to understand skin accumulation dynamics of non-PEGylated and PEGylated liposomes after systemic injection into mice. Non-PEGylated egg phosphatidylcholine (PC) liposomes showed short circulation half-life (1.3 h) and immediate aggregation in the blood, with some aggregates lodging in skin microvasculature soon after the injection. At 24 h, and more prominently at 48 h postinjection, liposomes appeared in dermal and subdermal cells...
October 18, 2017: ACS Nano
Torben Daeneke, Paul Atkin, Rebecca Orrell-Trigg, Ali Zavabeti, Taimur Ahmed, Sumeet Walia, Maning Liu, Yasuhiro Tachibana, Maria Javaid, Andrew D Greentree, Salvy P Russo, Richard B Kaner, Kourosh Kalantar-Zadeh
Atomically thin semiconductors are one of the fastest growing categories in materials science due to their promise to enable high-performance electronic and optical devices. Furthermore, a host of intriguing phenomena have been reported to occur when a semiconductor is confined within two dimensions. However, the synthesis of large area atomically thin materials remains as a significant technological challenge. Here we report a method that allows harvesting monolayer of semiconducting stannous oxide nanosheets (SnO) from the interfacial oxide layer of liquid tin...
October 18, 2017: ACS Nano
Charles Reilly, Donald E Ingber
Many have recognized the potential value of facilitating activities that span the art-science interface for the benefit of society; however, there are few examples that demonstrate how pursuit of an artistic agenda can lead to scientific insights. Here, we describe how we set out to produce an entertaining short film depicting the fertilization of the egg by sperm as a parody of a preview for another Star Wars movie to excite the public about science, but ended up developing a simulation tool for multiscale modeling...
October 18, 2017: ACS Nano
Gabriella D Shepard, Jenny V Ardelean, Obafunso A Ajayi, Daniel Rhodes, Xiaoyang Zhu, James C Hone, Stefan Strauf
Monolayer photonic materials offer a tremendous potential for on-chip optoelectronic devices. Their realization requires knowledge of optical coherence properties of excitons and trions that have so far been limited to nonlinear optical experiments carried out with strongly inhomogeneously broadened material. Here we employ h-BN-encapsulated and electrically gated MoSe2 to reveal coherence properties of trion species directly in the linear optical response. Autocorrelation measurements reveal long dephasing times up to T2 = 1...
October 18, 2017: ACS Nano
Zheng Li, Tieqi Huang, Weiwei Gao, Zhen Xu, Dan Chang, Chunxiao Zhang, Chao Gao
Carbon textiles are promising electrode materials for wearable energy storage devices owing to their conductive, flexible, and lightweight features. However, there still lacks a perfect choice for high-performance carbon textile electrodes with sufficient electrochemical activity. Graphene fiber fabrics (GFFs) are newly discovered carbon textiles, exhibiting various attractive properties, especially a large variability on the microstructure. Here we report the fabrication of hierarchical GFFs with significantly enlarged specific surface area using a hydrothermal activation strategy...
October 18, 2017: ACS Nano
Hongwei Tan, Gang Liu, Huali Yang, Xiaohui Yi, Liang Pan, Jie Shang, Shibing Long, Ming Liu, Yihong Wu, Run-Wei Li
Memristive devices are able to store and process information, which offers several key advantages over the transistor-based architectures. However, most of the two-terminal memristive devices have fixed functions once made and cannot be reconfigured for other situations. Here, we propose and demonstrate a memristive device "memlogic" (memory logic) as a nonvolatile switch of logic operations integrated with memory function in a single light-gated memristor. Based on nonvolatile light-modulated memristive switching behavior, a single memlogic cell is able to achieve optical and electrical mixed basic Boolean logic of reconfigurable "AND", "OR", and "NOT" operations...
October 18, 2017: ACS Nano
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