keyword
MENU ▼
Read by QxMD icon Read
search

Plasmon

keyword
https://www.readbyqxmd.com/read/28640628/oriented-gold-nanorods-and-gold-nanorod-chains-within-smectic-liquid-crystal-topological-defects
#1
Brigita Rožič, Jérôme Fresnais, Celine Molinaro, Joseph Calixte, Shivakumar Umadevi, Stephanie Lau-Truong, Nordin Felidj, Tobias Kraus, Fabrice Charra, Vincent Dupuis, Torsten Hegmann, Celine Fiorini-Debuisschert, Bruno Gallas, Emmanuelle Lacaze
We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm(2) to around 6 GNRs/μm(2). We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28637278/functional-and-structural-analysis-of-at-specific-minor-groove-binders-that-disrupt-dna-protein-interactions-and-cause-disintegration-of-the-trypanosoma-brucei-kinetoplast
#2
Cinthia R Millan, Francisco J Acosta-Reyes, Laura Lagartera, Godwin U Ebiloma, Leandro Lemgruber, J Jonathan Nué Martínez, Núria Saperas, Christophe Dardonville, Harry P de Koning, J Lourdes Campos
Trypanosoma brucei, the causative agent of sleeping sickness (Human African Trypanosomiasis, HAT), contains a kinetoplast with the mitochondrial DNA (kDNA), comprising of >70% AT base pairs. This has prompted studies of drugs interacting with AT-rich DNA, such as the N-phenylbenzamide bis(2-aminoimidazoline) derivatives 1 [4-((4,5-dihydro-1H-imidazol-2-yl)amino)-N-(4-((4,5-dihydro-1H-imidazol-2-yl)amino)phenyl)benzamide dihydrochloride] and 2 [N-(3-chloro-4-((4,5-dihydro-1H-imidazol-2-yl)amino)phenyl)-4-((4,5-dihydro-1H-imidazol-2-yl)amino)benzamide] as potential drugs for HAT...
June 16, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28636086/selective-and-tunable-near-infrared-and-visible-light-transmittance-of-moo3-x-nanocomposites-with-different-crystallinity
#3
Ning Li, Yamei Li, Guangyao Sun, Yining Ma, Tianci Chang, Shidong Ji, Heliang Yao, Xun Cao, Shanhu Bao, Ping Jin
In this Communication, we report MoO3-x nanocomposites in which the near-infrared and visible light transmittance can be selectively modulated through the crystallinity. The MoO3-x nanocomposites were fabricated by a hydrothermal method, and their optical properties were characterized by UV-Vis spectrometer. The obtained results proved the possibility to tune the nanocomposite's optical properties in the UV/Visible spectral region: crystalline MoO3 mainly regulates the near-infrared range (800-2600 nm), and amorphous MoO3-x mainly changes the visible range from 350 nm to 800 nm and MoO3-x , with semi-crystalline structures mainly modulating around 800-1000 nm...
June 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28634327/high-quality-factor-confined-tamm-modes
#4
C Symonds, S Azzini, G Lheureux, A Piednoir, J M Benoit, A Lemaitre, P Senellart, J Bellessa
We demonstrate that quality factors up to 5000 can be obtained in Tamm-like hybrid metal/semiconductor structures. To do this, a Bragg mirror is covered by a thin transparent layer and a metallic film. The reduced losses of these modes are related to an intermediate behavior between conventional Tamm plasmon and Bragg modes lying deeper in the semiconductor medium. One of the most striking features of this approach is that these super Tamm modes can still be spatially confined with the metal. Confinement on micrometric scale is experimentally demonstrated...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28632272/interfacial-synthesis-of-a-three-dimensional-hierarchical-mos2-ns-ag-np-nanocomposite-as-a-sers-nanosensor-for-ultrasensitive-thiram-detection
#5
Xiu Liang, Yi-Shuo Wang, Ting-Ting You, Xiao-Juan Zhang, Nan Yang, Guang-Sheng Wang, Peng-Gang Yin
Interfacial self-assembly of ordered nanostructures at oil-water interfaces towards the fabrication of nanofilms has attracted the interest of plenty of scientists, since its discovery in 2004. Herein, further developments have been achieved, and we report a new strategy for the synthesis of a three-dimensional (3D) hierarchical nanostructure, through an interfacial synthesis driven microemulsion process. Thus, the synthesis route has been simplified, with the rigorous experimental conditions of traditional compositing technology...
June 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28632165/fano-effect-and-quantum-entanglement-in-hybrid-semiconductor-quantum-dot-metal-nanoparticle-system
#6
REVIEW
Yong He, Ka-Di Zhu
In this paper, we review the investigation for the light-matter interaction between surface plasmon field in metal nanoparticle (MNP) and the excitons in semiconductor quantum dots (SQDs) in hybrid SQD-MNP system under the full quantum description. The exciton-plasmon interaction gives rise to the modified decay rate and the exciton energy shift which are related to the exciton energy by using a quantum transformation method. We illustrate the responses of the hybrid SQD-MNP system to external field, and reveal Fano effect shown in the absorption spectrum...
June 20, 2017: Sensors
https://www.readbyqxmd.com/read/28632153/fabrication-and-characterization-of-plasmonic-nanopores-with-cavities-in-the-solid-support
#7
Bita Malekian, Kunli Xiong, Gustav Emilsson, Jenny Andersson, Cecilia Fager, Eva Olsson, Elin M Larsson-Langhammer, Andreas B Dahlin
Plasmonic nanostructures are widely used for various sensing applications by monitoring changes in refractive index through optical spectroscopy or as substrates for surface enhanced Raman spectroscopy. However, in most practical situations conventional surface plasmon resonance is preferred for biomolecular interaction analysis because of its high resolution in surface coverage and the simple single-material planar interface. Still, plasmonic nanostructures may find unique sensing applications, for instance when the nanoscale geometry itself is of interest...
June 20, 2017: Sensors
https://www.readbyqxmd.com/read/28631921/direct-electron-beam-writing-of-silver-based-nanostructures
#8
Katja Hoeflich, Jakub Jurczyk, Yucheng Zhang, Marcos Vinicius Puydinger Dos Santos, Maximilian Goetz, Carlos Guerra-Nunez, James P Best, Czesław Kapusta, Ivo Utke
Direct writing utilizing a focused electron beam constitutes an interesting alternative to resist based techniques, as it allows for precise and flexible growth onto any conductive substrate in a single-step process. One important challenge, however, is the identification of appropriate precursors which allow for deposition of the material of choice e.g. for envisaged applications in nano-optics. In this regard the coinage metal silver is of particular interest since it shows a relatively high plasma frequency, and thus, excellent plasmonic properties in the visible range...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28630342/autoantibody-profiling-on-a-plasmonic-nano-gold-chip-for-the-early-detection-of-hypertensive-heart-disease
#9
Xiaoyang Li, Tatiana Kuznetsova, Nicholas Cauwenberghs, Matthew Wheeler, Holden Maecker, Joseph C Wu, Francois Haddad, Hongjie Dai
The role of autoimmunity in cardiovascular (CV) diseases has been increasingly recognized. Autoimmunity is most commonly examined by the levels of circulating autoantibodies in clinical practices. Measurement of autoantibodies remains, however, challenging because of the deficiency of reproducible, sensitive, and standardized assays. The lack of multiplexed assays also limits the potential to identify a CV-specific autoantibody profile. To overcome these challenges, we developed a nanotechnology-based plasmonic gold chip for autoantibody profiling...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630331/distinguishing-attosecond-electron-electron-scattering-and-screening-in-transition-metals
#10
Cong Chen, Zhensheng Tao, Adra Carr, Piotr Matyba, Tibor Szilvási, Sebastian Emmerich, Martin Piecuch, Mark Keller, Dmitriy Zusin, Steffen Eich, Markus Rollinger, Wenjing You, Stefan Mathias, Uwe Thumm, Manos Mavrikakis, Martin Aeschlimann, Peter M Oppeneer, Henry Kapteyn, Margaret Murnane
Electron-electron interactions are the fastest processes in materials, occurring on femtosecond to attosecond timescales, depending on the electronic band structure of the material and the excitation energy. Such interactions can play a dominant role in light-induced processes such as nano-enhanced plasmonics and catalysis, light harvesting, or phase transitions. However, to date it has not been possible to experimentally distinguish fundamental electron interactions such as scattering and screening. Here, we use sequences of attosecond pulses to directly measure electron-electron interactions in different bands of different materials with both simple and complex Fermi surfaces...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28629986/identification-of-influenza-polymerase-inhibitors-targeting-polymerase-pb2-cap-binding-domain-through-virtual-screening
#11
Ming Liu, Edwin Chun-Yeung Lo, Guoxin Wang, Hak-Fun Chow, Jacky Chi-Ki Ngo, David Chi-Cheong Wan, Leo Lit-Man Poon, Pang-Chui Shaw
Influenza A virus is the major cause of epidemics and pandemics worldwide. In this study, virtual screening was used to identify compounds interacting with influenza A polymerase PB2 cap-binding domain (CBD). With a database of 21,351 small molecules, 28 candidate compounds were obtained and four of them (225, 225D1, 426 and 426Br) were found to bind directly to PB2 CBD by surface plasmon resonance (SPR). The evaluation of compounds 426Br and 225 indicated that they could bind to PB2 CBD and inhibit influenza virus at low micromolar concentration...
June 16, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28629218/two-dimensional-plasmonic-nanoparticle-as-a-nanoscale-sensor-to-probe-polymer-brush-formation
#12
Assad Ullah Khan, Clayton Scruggs, David Hicks, Guoliang Liu
Conventional analysis and characterization of polymer brush formation relies on laborious methods that use quartz crystal microbalance, atomic force microscope, microcantilever, or other tools that measure concentration change of solutions. Herein we develop a simple and easy method that utilizes intrinsically-flat two-dimensional (2D) plasmonic nanoparticles as sensors for unveiling the mechanism of polymer brush formation on surfaces. Via ultraviolet-visible spectroscopy, the plasmonic nanoparticles can be used to determine the amount of polymers near the surface in situ...
June 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28629186/design-and-performance-of-a-portable-and-multichannel-spr-device
#13
Xiao-Ling Zhang, Yan Liu, Ting Fan, Ning Hu, Zhong Yang, Xi Chen, Zhen-Yu Wang, Jun Yang
A portable multichannel surface plasmon resonance (SPR) biosensor device is presented in this study. As an optical biosensor device, the core component of its light path is a semi-cylindrical prism, which is used as the coupling unit for the excitation of the SPR phenomena. Based on this prism, a wedge-shaped incident light beam including a continuous angle range (10°) is chosen to replace the commonly-used parallel light beam in traditional SPR devices, in which the incident angle is adjusted by a sophisticated mechanical system...
June 19, 2017: Sensors
https://www.readbyqxmd.com/read/28626832/fragment-binding-to-%C3%AE-secretase-1-without-catalytic-aspartate-interactions-identified-via-orthogonal-screening-approaches
#14
Frederik J R Rombouts, Richard Alexander, Erna Cleiren, Alex De Groot, Michel Carpentier, Joyce Dijkmans, Katleen Fierens, Stefan Masure, Diederik Moechars, Martina Palomino-Schätzlein, Antonio Pineda-Lucena, Andrés A Trabanco, Daan Van Glabbeek, Ann Vos, Gary Tresadern
An approach to identify β-secretase 1 (BACE1) fragment binders that do not interact with the catalytic aspartate dyad is presented. A ThermoFluor (thermal shift) and a fluorescence resonance energy transfer enzymatic screen on the soluble domain of BACE1, together with a surface plasmon resonance (SPR) screen on the soluble domain of BACE1 and a mutant of one catalytic Asp (D32N), were run in parallel. Fragments that were active in at least two of these assays were further confirmed using one-dimensional NMR (WaterLOGSY) and SPR binding competition studies with peptidic inhibitor OM99-2...
February 28, 2017: ACS Omega
https://www.readbyqxmd.com/read/28626359/noble-metal-modified-octahedral-anatase-titania-particles-with-enhanced-activity-for-decomposition-of-chemical-and-microbiological-pollutants
#15
Z Wei, M Endo, K Wang, E Charbit, A Markowska-Szczupak, B Ohtani, E Kowalska
Octahedral anatase particles (OAPs) were prepared by hydrothermal (HT) reaction of titanate nanowires (TNWs). OAPs were modified with noble metals (Au, Ag, Cu and Pt) by two photodeposition methods: in the absence and in the initial presence of oxygen in the system. Photocatalytic activities for oxidative decomposition of acetic acid and anaerobic dehydrogenation of methanol under UV/vis irradiation and for oxidation of 2-propanol under visible light irradiation were investigated. Antibacterial activities for bacteria (Escherichia coli) and fungi (Candida albicans) were investigated in the dark and under UV irradiation and/or visible light irradiation...
June 15, 2017: Chemical Engineering Journal
https://www.readbyqxmd.com/read/28625050/new-insight-into-the-chemical-nature-of-the-plasmonic-nanostructures-synthesized-by-reduction-of-au-iii-with-sulfide-species
#16
Maria Ana Huergo, Lisandro J Giovanetti, Mario Sergio Moreno, Christoph M Maier, Felix G Requejo, Roberto C Salvarezza, Carolina Vericat
We have studied the products of the controversial synthesis of HAuCl4 with Na2S, which include gold nanostructures (Au NSs) that absorb in the near-infrared (NIR) and are highly promising for photothermal therapies and other nanomedical applications. From high resolution transmission electron microscopy, X-ray absorption spectroscopy and small angle X-ray scattering we have found that only metallic gold nanostructures are formed as a result of this synthesis, with no detectable amount of gold sulfide or other oxidized gold species that could account for the NIR absorption...
June 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28624745/silver-chloride-enwrapped-silver-grafted-on-nitrogen-doped-reduced-graphene-oxide-as-a-highly-efficient-visible-light-driven-photocatalyst
#17
Liang Wang, Yilun Shi, Tianfu Wang, Lili Zhang
The visible-light-driven plasmonic photocatalyst silver chloride enwrapped silver/nitrogen-doped reduced graphene oxide (AgCl@Ag/N-rGO) was prepared by a facile hydrothermal-in situ oxidation method and characterized by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The characterization results reveal that Ag nanoparticles (NPs) were first grafted on N-rGO via N-groups as anchor sites and then enwrapped by AgCl by in situ oxidation...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28624473/antibody-blood-brain-barrier-efflux-is-modulated-by-glycan-modification
#18
John M Finke, Kari R Ayres, Ryan P Brisbin, Hali A Hill, Emily E Wing, William A Banks
BACKGROUND: Drug delivery to the brain is a major roadblock to treatment of Alzheimer's disease. Recent results of the PRIME study indicate that increasing brain penetration of antibody drugs improves Alzheimer's treatment outcomes. New approaches are needed to better accomplish this goal. Based on prior evidence, the hypothesis that glycan modification alters antibody blood-brain barrier permeability was tested here. METHODS: The blood-brain barrier permeability coefficient Pe of different glycosylated states of anti-amyloid IgG was measured using in vitro models of brain microvascular endothelial cells...
June 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28623338/high-resolution-imaging-of-a-cell-attached-nanointerface-using-a-gold-nanoparticle-two-dimensional-sheet
#19
Shihomi Masuda, Yuhki Yanase, Eiji Usukura, Sou Ryuzaki, Pangpang Wang, Koichi Okamoto, Thasaneeya Kuboki, Satoru Kidoaki, Kaoru Tamada
This paper proposes a simple, effective, non-scanning method for the visualization of a cell-attached nanointerface. The method uses localized surface plasmon resonance (LSPR) excited homogeneously on a two-dimensional (2D) self-assembled gold-nanoparticle sheet. The LSPR of the gold-nanoparticle sheet provides high-contrast interfacial images due to the confined light within a region a few tens of nanometers from the particles and the enhancement of fluorescence. Test experiments on rat basophilic leukemia (RBL-2H3) cells with fluorescence-labeled actin filaments revealed high axial and lateral resolution even under a regular epifluorescence microscope, which produced higher quality images than those captured under a total internal reflection fluorescence (TIRF) microscope...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28623281/tamm-plasmon-modes-on-semi-infinite-metallodielectric-superlattices
#20
Goran Isić, Slobodan Vuković, Zoran Jašić, Milivoj Belić
We analyze the fundamental properties of optical waves referred to as Tamm plasmon modes (TPMs) which are tied to the interface of a semi-infinite two-phase metallodielectric superlattice with an arbitrary homogeneous capping medium. Such modes offer new ways of achieving high electromagnetic field localization and spontaneous emission enhancement in the vicinity of the interface in conjunction with absorption loss management, which is crucial for future applications. The homointerface, formed when the capping medium has the same permittivity as one of the superlattice constituents, is found to support a TPM whose dispersion overlaps the single-interface surface plasmon polariton (SPP) dispersion but which has a cut off at the topological transition point...
June 16, 2017: Scientific Reports
keyword
keyword
12587
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"