Now showing items 2811-2830 of 5065

    • (n,m)-Specific Absorption Cross Sections of Single-Walled Carbon Nanotubes Measured by Variance Spectroscopy 

      Sanchez, Stephen R.; Bachilo, Sergei M.; Kadria-Vili, Yara; Lin, Ching-Wei; Weisman, R. Bruce; (2016)
      A new method based on variance spectroscopy has enabled the determination of absolute absorption cross sections for the first electronic transition of 12 (n,m) structural species of semiconducting single-walled carbon nanotubes (SWCNTs). Spectrally resolved measurements of fluorescence variance in dilute bulk samples provided particle number ...
    • NAF-1 and mitoNEET are central to human breast cancer proliferation by maintaining mitochondrial homeostasis and promoting tumor growth 

      (2013)
      Mitochondria are emerging as important players in the transformation process of cells, maintaining the biosynthetic and energetic capacities of cancer cells and serving as one of the primary sites of apoptosis and autophagy regulation. Although several avenues of cancer therapy have focused on mitochondria, progress in developing mitochondria-targeting ...
    • NaFe0.56Cu0.44As: A Pnictide Insulating Phase Induced by On-Site Coulomb Interaction 

      Matt, C.E.; Xu, N.; Lv, Baiqing; Ma, Junzhang; Bisti, F.; (2016)
      In the studies of iron pnictides, a key question is whether their bad-metal state from which the superconductivity emerges lies in close proximity with a magnetically ordered insulating phase. Recently, it was found that at low temperatures, the heavily Cu-doped NaFe1−xCuxAs (x>0.3) iron pnictide is an insulator with long-range antiferromagnetic ...
    • Nanoantenna-Enhanced Light-Matter Interaction in Atomically Thin WS2 

      (2015)
      Atomically thin transition metal dichalcogenides (TMDCs) are an emerging class of two-dimensional semiconductors. Recently, the first optoelectronic devices featuring photodetection as well as electroluminescence have been demonstrated using monolayer TMDCs as active material. However, the lightヨmatter coupling for atomically thin TMDCs is limited ...
    • Nanocrystalline materials: recent advances in crystallographic characterization techniques 

      Ringe, Emilie (2014)
      Most properties of nanocrystalline materials are shape-dependent, providing their exquisite tunability in optical, mechanical, electronic and catalytic properties. An example of the former is localized surface plasmon resonance (LSPR), the coherent oscillation of conduction electrons in metals that can be excited by the electric field of light; this ...
    • Nanofibrous peptide hydrogel elicits angiogenesis and neurogenesis without drugs, proteins, or cells 

      Moore, Amanda N.; Lopez Silva, Tania L.; Carrejo, Nicole C.; Origel Marmolejo, Carlos A.; Li, I-Che; (2018)
      The design of materials for regenerative medicine has focused on delivery of small molecule drugs, proteins, and cells to help accelerate healing. Additionally, biomaterials have been designed with covalently attached mimics of growth factors, cytokines, or key extracellular matrix components allowing the biomaterial itself to drive biological response. ...
    • Nanofibrous Snake Venom Hemostat 

      Kumar, Vivek A.; Wickremasinghe, Navindee C.; Shi, Siyu; Hartgerink, Jeffrey D. (2015)
      Controlling perioperative bleeding is of critical importance to minimize hemorrhaging and fatality. Patients on anticoagulant therapy such as heparin have diminished clotting potential and are at risk for hemorrhaging. Here we describe a self-assembling nanofibrous peptide hydrogel (termed SLac) that on its own can act as a physical barrier to blood ...
    • Nanoparticles Heat through Light Localization 

      (2014)
      Aqueous solutions containing light-absorbing nanoparticles have recently been shown to produce steam at high efficiencies upon solar illumination, even when the temperature of the bulk fluid volume remains far below its boiling point. Here we show that this phenomenon is due to a collective effect mediated by multiple light scattering from the dispersed ...
    • Nanoparticulate carbon black in cigarette smoke induces DNA cleavage and Th17-mediated emphysema 

      (2015)
      Chronic inhalation of cigarette smoke is the major cause of sterile inflammation and pulmonary emphysema. The effect of carbon black (CB), a universal constituent of smoke derived from the incomplete combustion of organic material, in smokers and non-smokers is less known. In this study, we show that insoluble nanoparticulate carbon black (nCB) ...
    • Nanoporous Metals: From Plasmonic Properties to Applications in Enhanced Spectroscopy and Photocatalysis 

      Koya, Alemayehu Nana; Zhu, Xiangchao; Ohannesian, Nareg; Yanik, A. Ali; Alabastri, Alessandro; (2021)
      The field of plasmonics is capable of enabling interesting applications in different wavelength ranges, spanning from the ultraviolet up to the infrared. The choice of plasmonic material and how the material is nanostructured has significant implications for ultimate performance of any plasmonic device. Artificially designed nanoporous metals (NPMs) ...
    • Nanoscale coupling of endocytic pit growth and stability 

      Lehmann, Martin; Lukonin, Ilya; Noé, Frank; Schmoranzer, Jan; Clementi, Cecilia; (2019)
      Clathrin-mediated endocytosis, an essential process for plasma membrane homeostasis and cell signaling, is characterized by stunning heterogeneity in the size and lifetime of clathrin-coated endocytic pits (CCPs). If and how CCP growth and lifetime are coupled and how this relates to their physiological function are unknown. We combine computational ...
    • Nanoscale Engineering of Inorganic Composite Scintillation Materials 

      Korzhik, Mikhail; Fedorov, Andrei; Dosovitskiy, Georgy; Anniyev, Toyli; Vasilyev, Maxim; (2021)
      This review article considers the latest developments in the field of inorganic scintillation materials. Modern trends in the improvement of inorganic scintillation materials are based on engineering their features at the nanoscale level. The essential challenges to the fundamental steps of the technology of inorganic glass, glass ceramics, and ceramic ...
    • Nanoscale Probing of Image-Potential States and Electron Transfer Doping in Borophene Polymorphs 

      Liu, Xiaolong; Wang, Luqing; Yakobson, Boris I.; Hersam, Mark C. (2021)
      Because synthetic 2D materials are generally stabilized by interfacial coupling to growth substrates, direct probing of interfacial phenomena is critical for understanding their nanoscale structure and properties. Using field-emission resonance spectroscopy with an ultrahigh vacuum scanning tunneling microscope, we reveal Stark-shifted image-potential ...
    • NanoSIMS results from olivine-hosted melt embayments: Magma ascent rate during explosive basaltic eruptions 

      (2014)
      The explosivity of volcanic eruptions is governed in part by the rate at which magma ascends and degasses. Because the time scales of eruptive processes can be exceptionally fast relative to standard geochronometers, magma ascent rate remains difficult to quantify. Here we use as a chronometer concentration gradients of volatile species along open ...
    • Nanostructure investigations of nonlinear differential conductance in NdNiO3 thin films 

      (2014)
      Transport measurements on thin films of NdNiO3 reveal a crossover to a regime of pronounced nonlinear conduction below the well-known metal-insulator transition temperature. The evolution of the transport properties at temperatures well below this transition appears consistent with a gradual formation of a gap in the holelike Fermi surface of this ...
    • Nanostructured Films of Oppositely Charged Domains from Self-Assembled Block Copolymers 

      Fultz, Brandon A.; Terlier, Tanguy; Dunoyer de Segonzac, Beatriz; Verduzco, Rafael; Kennemur, Justin G. (2020)
      The exploration of poly(tert-butyl methacrylate)-block-poly(4-vinylpyridine), PtBMA-b-P4VP, as a precursor material for the creation of nanostructured films with oppositely charged domains is reported. Thin films of hexagonally packed P4VP cylinders were self-assembled perpendicular to the surface and subsequently treated with bromoethane vapor at ...
    • A Nanostructured Synthetic Collagen Mimic for Hemostasis 

      (2014)
      Collagen is a major component of the extracellular matrix and plays a wide variety of important roles in blood clotting, healing, and tissue remodeling. Natural, animal derived, collagen is used in many clinical applications but concerns exist with respect to its role in inflammation, batch-to-batch variability, and possible disease transfection. ...
    • Nanotechnology-enhanced immunotherapy for metastatic cancer 

      Zhang, Peisen; Meng, Junli; Li, Yingying; Yang, Chen; Hou, Yi; (2021)
      A vast majority of cancer deaths occur as a result of metastasis. Unfortunately, effective treatments for metastases are currently lacking due to the difficulty of selectively targeting these small, delocalized tumors distributed across a variety of organs. However, nanotechnology holds tremendous promise for improving immunotherapeutic outcomes in ...
    • Nanowire electrodes for high-density stimulation and measurement of neural circuits 

      (2013)
      Brain-machine interfaces (BMIs) that can precisely monitor and control neural activity will likely require new hardware with improved resolution and specificity. New nanofabricated electrodes with feature sizes and densities comparable to neural circuits may lead to such improvements. In this perspective,we review the recent development of vertical ...