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ACS Nano

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https://www.readbyqxmd.com/read/28549217/surface-enhanced-raman-scattering-active-gold-nanoparticles-with-enzyme-mimicking-activities-for-measuring-glucose-and-lactate-in-living-tissues
#1
Yihui Hu, Hanjun Cheng, Xiaozhi Zhao, Jiangjiexing Wu, Faheem Muhammad, Shichao Lin, Jian He, Liqi Zhou, Chengping Zhang, Yu Deng, Peng Wang, Zhengyang Zhou, Shuming Nie, Hui Wei
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme mimicking properties with their surface-enhanced Ra-man scattering (SERS) activities has yet to be explored. Here we designed a peroxidase mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal-organic framework (MOF) called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as the peroxidase mimics to oxidize Raman inactive reporter leucomalachite green (LMG) into the active malachite green (MG) with hydrogen peroxide, and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28549216/agglomeration-determines-effects-of-carbonaceous-nanomaterials-on-soybean-nodulation-dinitrogen-fixation-potential-and-growth-in-soil
#2
Ying Wang, Chong Hyun Chang, Zhaoxia Ji, Dermont C Bouchard, Roger M Nisbet, Joshua P Schimel, Jorge L Gardea-Torresdey, Patricia A Holden
The potential effects of carbonaceous nanomaterials (CNMs) on agricultural plants are of concern. However, little research has been performed using plants cultivated to maturity in soils contaminated with various CNMs at different concentrations. Here, we grew soybean for 39 days to seed production in soil amended with 0.1, 100, or 1000 mg kg-1 of either multi-walled carbon nanotubes (MWCNTs), graphene nanoplatelets (GNPs), or carbon black (CB), and studied plant growth, nodulation, and dinitrogen (N2) fixation potential...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28549215/nanowire-mesh-templated-growth-of-out-of-plane-three-dimensional-fuzzy-graphene
#3
Raghav Garg, Sahil Kumar Rastogi, Michael Lamparski, Sergio de la Barrera, Gordon T Pace, Noel T Nuhfer, Benjamin Matthew Hunt, Vincent Meunier, Tzahi Cohen-Karni
Graphene, a honeycomb sp(2) hybridized carbon lattice, is a promising building block for hybrid-nanomaterials due to its electrical, mechanical, and optical properties. Graphene can be readily obtained through mechanical exfoliation, solution-based deposition of reduced graphene oxide (rGO), and chemical vapor deposition (CVD). The resulting graphene films' topology is two-dimensional (2D) surface. Recently a three-dimensional (3D) graphene topology has been demonstrated by various approaches. However, the resulting graphene films are lying flat on the surface hence still exposing a 2D surface topology...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28549214/griffith-criterion-for-nanoscale-stress-singularity-in-brittle-silicon
#4
Takashi Sumigawa, Takahiro Shimada, Shuuhei Tanaka, Hiroki Unno, Naoki Ozaki, Shinsaku Ashida, Takayuki Kitamura
Brittle materials such as silicon fail via the crack nucleation and propagation, which is characterized by the singular stress field formed near the crack tip according to Griffith or fracture mechanics theory. The applicability of these continuum-based theories is, however, uncertain and questionable in nanoscale system due to its extremely small singular stress field of only a few nanometers. Here, we directly characterize the mechanical behavior of a nano-crack via the development of in situ nanomechanical testing using a transmission electron microscope, and demonstrate that Griffith or fracture mechanics theory can be applied to even 4-nm stress singularity despite their continuum-based concept...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28548843/zwitterionic-nanocarrier-surface-chemistry-improves-sirna-tumor-delivery-and-silencing-activity-relative-to-polyethylene-glycol
#5
Meredith A Jackson, Thomas A Werfel, Elizabeth J Curvino, Fang Yu, Taylor Elizabeth Kavanaugh, Samantha M Sarett, Mary D Dockery, Kameron V Kilchrist, Ayisha N Jackson, Todd D Giorgio, Craig L Duvall
Although siRNA-based nanomedicines hold promise for cancer treatment, conventional siRNA-polymer complex (polyplex) nanocarrier systems have poor pharmacokinetics following intravenous delivery, hindering tumor accumulation. Here, we determined the impact of surface chemistry on the in vivo pharmacokinetics and tumor delivery of siRNA polyplexes. A library of diblock polymers was synthesized, all containing the same pH-responsive, endosomolytic polyplex core-forming block but different corona blocks: 5 kDa (benchmark) and 20 kDa linear PEG, 10 kDa and 20 kDa brush-like poly(oligo ethylene glycol) (POEGMA), and 10 kDa and 20 kDa zwitterionic phosphorylcholine-based polymers (PMPC)...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28537714/enhanced-afterglow-performance-of-persistent-luminescence-implants-for-efficient-repeatable-photodynamic-therapy
#6
Wenpei Fan, Nan Lu, Can Xu, Yijing Liu, Jing Lin, Sheng Wang, Zheyu Shen, Zhen Yang, Junle Qu, Tianfu Wang, Siping Chen, Peng Huang, Xiaoyuan Chen
Persistent luminescence nanoparticles (PLNPs) have been used for bioimaging without autofluorescence background interference, but the poor afterglow performance impedes their further applications in cancer therapy. To overcome the Achilles' heel of PLNPs, herein we report the construction of injectable persistent luminescence implants (denoted as PL implants) as a built-in excitation source for efficient repeatable photodynamic therapy (PDT). The injectable ZGC (ZnGa1.996O4:Cr0.004) PL implants were prepared by dissolving ZGC PLNPs in poly(lactic-co-glycolic acid)/N-methylpyrrolidone oleosol, which demonstrated much stronger persistent luminescence (PersL) intensity and longer PersL lifetime than that of ZGC PLNPs both in vitro and in vivo...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28535341/fully-stretchable-optoelectronic-sensors-based-on-colloidal-quantum-dots-for-sensing-photoplethysmographic-signals
#7
Tae-Ho Kim, Chang-Seok Lee, Sangwon Kim, Jaehyun Hur, Sangmin Lee, Keun Wook Shin, Young-Zoon Yoon, Moon Kee Choi, Jiwoong Yang, Dae-Hyeong Kim, Taeghwan Hyeon, Seongjun Park, Sungwoo Hwang
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28525720/experimental-and-theoretical-investigations-of-surface-assisted-graphene-nanoribbon-synthesis-featuring-carbon-fluorine-bond-cleavage
#8
Hironobu Hayashi, Junichi Yamaguchi, Hideyuki Jippo, Ryunosuke Hayashi, Naoki Aratani, Mari Ohfuchi, Shintaro Sato, Hiroko Yamada
Edge-fluorinated graphene nanoribbons are predicted to exhibit attractive structural and electronic properties, which, however, still need to be demonstrated experimentally. Hence, to provide further experimental insights, an anthracene trimer comprising a partially fluorinated central unit is explored as a precursor molecule, with scanning tunneling microscopy and X-ray photoelectron spectroscopy analyses, indicating the formation of partially edge-fluorinated polyanthrylenes via on-surface reactions after annealing at 350 °C on Au(111) under ultrahigh-vacuum conditions...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541681/platelet-microcapsule-hybrids-leverage-contractile-force-for-targeted-delivery-of-hemostatic-agents
#9
Caroline E Hansen, David R Myers, Wallace Hunter Baldwin, Yumiko Sakurai, Shannon L Meeks, L Andrew Lyon, Wilbur A Lam
We report a cell-mediated, targeted drug delivery system utilizing polyelectrolyte multilayer capsules that hybridize with the patient's own platelets upon intravenous administration. The hybridized platelets function as the sensor and actuator for targeted drug delivery and controlled release in our system. These capsules are biochemically and mechanically tuned to enable platelet adhesion and capsule rupture upon platelet activation and contraction, enabling the targeted and controlled "burst" release of an encapsulated biotherapeutic...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541666/unveiling-the-molecular-structure-of-pulmonary-surfactant-corona-on-nanoparticles
#10
Qinglin Hu, Xuan Bai, Guoqing Hu, Yi Y Zuo
The growing risk of human exposure to airborne nanoparticles (NPs) causes a general concern on the biosafety of nanotechnology. Inhaled NPs can deposit in the deep lung at which interacting with the pulmonary surfactant (PS). Despite the increasing study of nano-bio interactions, detailed molecular mechanisms by which inhaled NPs interact with the natural PS system remain unclear. Using coarse-grained molecular dynamics simulation, we studied the interaction between NPs and the PS system in the alveolar fluid...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541662/in-operando-quantification-of-three-dimensional-water-distribution-in-nanoporous-carbon-based-layers-in-polymer-electrolyte-membrane-fuel-cells
#11
Saad Alrwashdeh, Ingo Manke, Henning Markötter, Merle Klages, Martin Göbel, Jan Haußmann, Joachim Scholta, John Banhart
Understanding the function of nanoporous materials employed in polymer electrolyte membrane fuel cells (PEMFCs) is crucial to improve their performance, durability and cost efficiency. Up to now, the water distribution in the nm-sized pore structures was hardly accessible during operation of the cells. Here we demonstrate that phase contrast synchrotron X-ray tomography allows for an in-operando quantification of the three-dimensional water distribution within the nm-sized pores of carbon-based micro porous layers (MPLs)...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541660/supra-nanoparticle-functional-assemblies-through-programmable-stacking
#12
Cheng Tian, Marco Aurelio L Cordeiro, Julien Lhermitte, Huolin L Xin, Lior Shani, Mingzhao Liu, Chunli Ma, Yosef Yeshurun, Donald DiMarzio, Oleg Gang
The quest for the by-design assembly of material and devices from nanoscale inorganic components is well recognized. Conventional self-assembly is often limited in its ability to control material morphology and structure simultaneously. Here, we report a general method of assembling nanoparticles in a linear "pillar" morphology with regulated internal configurations. Our approach is inspired by supramolecular systems, where intermolecular stacking guides the assembly process to form diverse linear morphologies...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541656/charge-transfer-and-orbital-level-alignment-at-inorganic-organic-interfaces-the-role-of-dielectric-interlayers
#13
Michael Hollerer, Daniel Lüftner, Philipp Hurdax, Thomas Ules, Serguei Soubatch, Frank Stefan Tautz, Georg Koller, Peter Puschnig, Martin Sterrer, Michael G Ramsey
It is becoming accepted that ultra-thin dielectric layers on metals are not merely passive decoupling layers, but can actively influence orbital energy level alignment and charge transfer at interfaces. As such, they can be important in applications ranging from catalysis to organic electronics. However, the details at the molecular level are still under debate. In this study, we present a comprehensive analysis of the phenomenon of charge transfer promoted by a dielectric interlayer with a comparative study of pentacene adsorbed on Ag(001) with and without an ultra-thin MgO interlayer...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28541654/stable-1t-mose2-and-carbon-nanotubes-hybridized-flexible-film-binder-free-and-high-performance-li-ion-anode
#14
Ting Xiang, Shi Tao, Weiyu Xu, Qi Fang, Chuanqiang Wu, Daobin Liu, Yu Zhou, Adnan Khalil, Zahir Muhammad, Wangsheng Chu, Zhonghui Wang, Hongfa Xiang, Qin Liu, Li Song
Two-dimensional stable metallic 1T-MoSe2 with expanded interlayer spacing of 10.0 Å in-situ grown on SWCNTs film is fabricated via a one-step solvothermal method. Combined with X-ray absorption near-edge structures, our characterizations reveals that such 1T-MoSe2 and single-walled carbon nanotubes (abbreviated as 1T-MoSe2/SWCNTs) hybridized structure can provide strong electrical and chemical coupling between 1T-MoSe2 nanosheets and SWCNTs film in a form of C-O-Mo bonding, which is significantly benefiting a high-efficiency electron/ion transport pathway and structural stability, thus directly enabling high performance lithium-storage properties...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28531351/pharmaceutical-intermediate-modified-gold-nanoparticles-against-multidrug-resistant-bacteria-and-wound-healing-application-via-an-electrospun-scaffold
#15
Xinglong Yang, Junchuan Yang, Le Wang, Bei Ran, Yuexiao Jia, Lingmin Zhang, Guang Yang, Huawu Shao, Xingyu Jiang
Remedying a multidrug-resistant (MDR) bacteria wound infection is a major challenge due to the inability of conventional antibiotics to treat such infections against MDR bacteria. Thus, developing wound dressings for wound care, particularly against MDR bacteria, is in huge demand. Here, we present a strategy in designing wound dressings: we use a small molecule (6-aminopenicillanic acid, APA)-coated gold nanoparticles (AuNPs) to inhibit MDR bacteria. We dope the AuNPs into electrospun fibers of poly(ε-caprolactone) (PCL)/gelatin to yield materials that guard against wound infection by MDR bacteria...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530820/behavior-of-germanium-and-silicon-nanowire-anodes-with-ionic-liquid-electrolytes
#16
Guk-Tae Kim, Tadhg Kennedy, Michael Brandon, Hugh Geaney, Kevin M Ryan, Stefano Passerini, Giovanni B Appetecchi
The electrochemical behavior of binder-free, germanium and silicon nanowires as high-capacity anode materials for lithium-ion battery systems is investigated in an ionic liquid electrolyte. Cyclic voltammetry, cycling tests, and impedance spectroscopy reveal a highly reversible lithium alloying/dealloying process, as well as promising compatibility between the Ge and Si materials and the electrolyte components. Reversible capacities of 1400 and 2200 mA h g(-1) are delivered by the Ge and Si anodes, respectively, matching the values exhibited in conventional organic solutions...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28525715/ultrasmall-magnetic-cufese2-ternary-nanocrystals-for-multimodal-imaging-guided-photothermal-therapy-of-cancer
#17
Xinxin Jiang, Shaohua Zhang, Feng Ren, Lei Chen, Jianfeng Zeng, Mo Zhu, Zhenxiang Cheng, Mingyuan Gao, Zhen Li
Nanoscale ternary chalcogenides have attracted intense research interest due to their wealth of tunable properties and diverse applications in energy and environmental and biomedical fields. In this article, ultrasmall magnetic CuFeSe2 ternary nanocrystals (<5.0 nm) were fabricated in the presence of thiol-functionalized poly(methacrylic acid) by an environmentally friendly aqueous method under ambient conditions. The small band gap and the existence of intermediate bands lead to a broad NIR absorbance in the range of 500-1100 nm and high photothermal conversion efficiency (82%) of CuFeSe2 nanocrystals...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28538094/in-situ-atomic-scale-observation-of-droplet-coalescence-driven-nucleation-and-growth-at-liquid-solid-interfaces
#18
Junjie Li, Zhongchang Wang, Francis Leonard Deepak
Unravelling dynamical processes of liquid droplets at liquid/solid interfaces and the interfacial ordering is critical to understanding solidification, liquid-phase epitaxial growth, wetting, liquid-phase joining, crystal growth, and lubrication process, all of which are linked to different important applications in material science. In this work, we observe direct in-situ atomic-scale behaviour of Bi droplets segregated on SrBi2Ta2O9 by using aberration corrected transmission electron microscopy and demonstrate ordered interface and surface structures for the droplets on the oxide at the atomic-scale and unravel a nucleation mechanism involving droplet coalescence at the liquid/solid interface...
May 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28538092/discriminating-residue-substitutions-in-a-single-protein-molecule-using-a-sub-nanopore
#19
Zhuxin Dong, Eamonn Kennedy, Mohammad Hokmabadi, Gregory Timp
It is now possible to create, in a thin inorganic membrane, a single, sub-nanometer-diameter pore, i.e. a sub-nanopore, about the size of an amino acid residue. To explore the prospects for sequencing protein with it, measurements of the force and current were performed as two denatured histones, which differed by four amino acid residue substitutions, were impelled systematically through the sub-nanopore one-at-a-time using an atomic force microscope. The force measurements revealed that once the denatured protein, stabilized by sodium dodecyl sulfate (SDS), translocated through the sub-nanopore, a disproportionately large force was required to pull it back...
May 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28535349/solitary-oxygen-dopant-emission-from-carbon-nanotubes-modified-by-dielectric-metasurfaces
#20
Xuedan Ma, Anthony R James, Nicolai F Hartmann, Jon K Baldwin, Jason Dominguez, Michael B Sinclair, Ting S Luk, Omri Wolf, Sheng Liu, Stephen K Doorn, Han Htoon, Igal Brener
All-dielectric metasurfaces made from arrays of high index nanoresonators supporting strong magnetic dipole modes have emerged as a low-loss alternative to plasmonic metasurfaces. Here we use oxygen-doped single-walled carbon nanotubes (SWCNTs) as quantum emitters and couple them to silicon metasurfaces to study effects of the magnetic dipole modes of the constituent nanoresonators on the photoluminescence (PL) of individual SWCNTs. We find that when in resonance, the magnetic mode of the silicon nanoresonators can lead to a moderate average PL enhancement of 0...
May 23, 2017: ACS Nano
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