keyword
MENU ▼
Read by QxMD icon Read
search

Optics

keyword
https://www.readbyqxmd.com/read/28441775/progress-in-the-correlative-atomic-force-microscopy-and-optical-microscopy
#1
REVIEW
Lulu Zhou, Mingjun Cai, Ti Tong, Hongda Wang
Atomic force microscopy (AFM) has evolved from the originally morphological imaging technique to a powerful and multifunctional technique for manipulating and detecting the interactions between molecules at nanometer resolution. However, AFM cannot provide the precise information of synchronized molecular groups and has many shortcomings in the aspects of determining the mechanism of the interactions and the elaborate structure due to the limitations of the technology, itself, such as non-specificity and low imaging speed...
April 24, 2017: Sensors
https://www.readbyqxmd.com/read/28441670/plaque-erosion-causing-st-segment-elevation-myocardial-infarction-report-of-an-optical-coherence-tomography-documented-case-and-concise-literature-review
#2
Lorenzo Genuardi, Francesco Burzotta, Rocco Vergallo, Filippo Crea
No abstract text is available yet for this article.
June 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/28441503/robust-uniform-and-highly-emissive-quantum-dot-polymer-films-and-patterns-using-thiol-ene-chemistry
#3
Markus Smith, Sidney T Malak, Jaehan Jung, Young Jun Yoon, Chun Hao Lin, Sunghan Kim, Kyung Min Lee, Ruilong Ma, Timothy J White, Timothy J Bunning, Zhiqun Lin, Vladimir V Tsukruk
This work demonstrates a facile and versatile method for generating low scattering crosslinked quantum dots (QD)-polymer composite films and patterned highly emissive structures with ultra-high QD loading, minimal phase-separation, and tunable mechanical properties. Uniform QD-polymer films are fabricated using thiol-ene chemistry, in which cross-linked polymer networks are rapidly produced in ambient conditions via fast UV polymerization in bulk to suppress QD aggregation. UV-controlled thiol-ene chemistry limits phase separation through producing highly QD loaded crosslinked composites with loading rate above majority of those reported in literature (<1%) and approaching 30%...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28441500/thermoplasmonic-semitransparent-nanohole-electrodes
#4
Daniel Tordera, Dan Zhao, Anton V Volkov, Xavier Crispin, Magnus P Jonsson
Non-radiative decay of plasmons in metallic nanostructures offers unique means for light-to-heat conversion at the nanoscale. Typical thermoplasmonic systems utilize discrete particles, while metal nanohole arrays were instead considered suitable as heat sinks to reduce heating effects. By contrast, we show for the first time that, under uniform broadband illumination (e.g. the sun), ultrathin plasmonic nanohole arrays can be highly competitive plasmonic heaters and provide significantly higher temperatures than analogous nanodisk arrays...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28441498/thin-wall-gan-inaln-multiple-quantum-well-tubes
#5
Christophe Durand, Jean-François Carlin, Catherine Bougerol, Bruno Gayral, Damien Salomon, Jean-Paul Barnes, Joel Eymery, Raphael Butte, Nicolas Grandjean
Thin-wall tubes composed of nitride semiconductors (III-N compounds) based on GaN/InAlN multiple quantum wells (MQWs) are fabricated by metal-organic vapor-phase epitaxy in a simple and full III-N approach. The synthesis of such MQW-tubes is based on the growth of N-polar c-axis vertical GaN wires surrounded by a core-shell MQW heterostructure followed by in situ selective etching using controlled H2/NH3 annealing at 1010°C to remove the inner GaN wire part. After this process, well-defined MQW-based tubes having non-polar m-plane orientation exhibit UV light near 330 nm up to room temperature, consistent with the emission of GaN/InAlN MQWs...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28441494/the-role-of-the-reducing-agent-in-the-electroless-deposition-of-copper-on-functionalized-sams
#6
Ashley Ann Ellsworth, Amy Victoria Walker
Metallized organic layer constructs have a wide range of technological applications. Electroless deposition is an attractive technique by which to deposit metal overlayers because it is inexpensive and can be performed low temperatures compatible with organic materials. Amine borane reducing agents are versatile which are capable of depositing metals, semiconductors and even insulators. We have investigated the role of amine borane reducing agents in the electroless deposition of copper on -CH3, -OH, and -COOH terminated SAMs adsorbed on gold using time-of-flight secondary ion mass spectrometry, optical microscopy and complementary MP2 calculations...
April 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28441478/energy-transfer-kinetics-driven-by-mid-infrared-amplified-spontaneous-emissions-after-two-photon-excitation-from-xe-s0-to-the-xe-6p-1-2-0-state
#7
Shan He, Yafu Guan, Dong Liu, Xusheng Xia, Baodong Gai, Shu Hu, Jingwei Guo, Fengting Sang, Yuqi Jin
In optically pumped laser systems, rare gas lasers (RGLs) are a field of great interest for researchers. Gas laser regimes with metastable Ne, Ar, and Kr atoms have been investigated, while studies of RGLs based on metastable Xe are sparse. In this work, when a strong excitation laser (2.92 mJ/pulse, 7.44*10^5 W/cm2) was applied to excite Xe atoms from the ground state to the 6p[1/2]0 state, an interesting phenomenon emerged: An intense fluorescence of 980 nm (6p[1/2]1-6s[3/2]2) was produced. However, when the energy of excitation laser was decreased to 0...
April 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28441473/assembly-of-macrocycle-dye-derivatives-into-particles-for-fluorescence-and-photoacoustic-applications
#8
Hoang Dung Lu, Tristan L Lim, Shoshana Javitt, Andrew Heinmiller, Robert K Prud'homme
Optical imaging is a rapidly progressing medical technique that can benefit from the development of new and improved optical imaging agents suitable for use in vivo. However, the molecular rules detailing what optical agents can be processed and encapsulated into in vivo presentable forms are not known. We here present the screening of series of highly hydrophobic porphyrin, phthalocyanine, and naphthalocyanine dye macrocycles through a self-assembling Flash NanoPrecipitation process to form a series of water dispersible dye nanoparticles (NPs)...
April 25, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28441398/the-effects-of-immune-protein-cd3%C3%AE-development-and-degeneration-of-retinal-neurons-after-optic-nerve-injury
#9
Tao He, Xavier Mortensen, Ping Wang, Ning Tian
Major histocompatibility complex (MHC) class I molecules and their receptors play fundamental roles in neuronal death during diseases. T-cell receptors (TCR) function as MHCI receptor on T-cells and both MHCI and a key component of TCR, CD3ζ, are expressed by mouse retinal ganglion cells (RGCs) and displaced amacrine cells. Mutation of these molecules compromises the development of RGCs. We investigated whether CD3ζ regulates the development and degeneration of amacrine cells after RGC death. Surprisingly, mutation of CD3ζ not only impairs the proper development of amacrine cells expressing CD3ζ but also those not expressing CD3ζ...
2017: PloS One
https://www.readbyqxmd.com/read/28441351/probing-temperature-and-ph-dependent-binding-between-quantum-dots-and-bovine-serum-albumin-by-fluorescence-correlation-spectroscopy
#10
Zonghua Wang, Qiyan Zhao, Menghua Cui, Shichao Pang, Jingfang Wang, Ying Liu, Liming Xie
Luminescent quantum dots (QDs) with unique optical properties have potential applications in bio-imaging. The interaction between QDs and bio-molecules is important to the biological effect of QDs in vivo. In this paper, we have employed fluorescence correlation spectroscopy (FCS) to probe the temperature- and pH-dependent interactions between CdSe QDs with carboxyl (QDs-COOH) and bovine serum albumin (BSA) in buffer solutions. The results have shown that microscopic dissociation constant K'D is in the range of (1...
April 25, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28441321/a-cost-effective-relative-humidity-sensor-based-on-side-coupling-induction-technology
#11
Yingzi Zhang, Yulong Hou, Wenyi Liu, Huixin Zhang, Yanjun Zhang, Zhidong Zhang, Jing Guo, Jia Liu, Liang Zhang, Qiu-Lin Tan
A intensity-modulated optical fiber relative humidity (RH) sensor based on the side coupling induction technology (SCIT) is presented and experimentally demonstrated. The agarose gel and the twisted macro-bend coupling structure are first combined for RH sensing applications. The refractive index (RI) of the agarose gel increases with the increase of the RH and is in linear proportion from 20 to 80%RH. The side coupling power, which changes directly with the RI of the agarose gel, can strip the source noise from the sensor signal and improve the signal to noise ratio substantially...
April 25, 2017: Sensors
https://www.readbyqxmd.com/read/28441288/investigation-of-optically-stimulated-luminescence-and-signal-fading-properties-of-several-materials
#12
W Geoffrey West, Kimberlee J Kearfott, Chun Yong Seow
Optically stimulated luminescence (OSL) dosimetry involves the illumination of an irradiated sample on an appropriate material to produce a stimulated emission of light, whose intensity is indicative of the radiation dose. This technique is currently used for personnel dosimetry, environmental dosimetry, and geological dating applications. While a great deal of published research focusing on α-Al2O3:C and natural materials used for geological dating exist, relatively little is known about the OSL properties of thermoluminescent (TL) materials...
June 2017: Health Physics
https://www.readbyqxmd.com/read/28441214/the-osteo-odonto-keratoprosthesis
#13
Mehran Zarei-Ghanavati, Venkata Avadhanam, Alfonso Vasquez Perez, Christopher Liu
PURPOSE OF REVIEW: To describe the practice of and recent developments in the osteo-odonto-keratoprosthesis. RECENT FINDINGS: Formal psychological assessment and support have been described. A sub-aqua system for fashioning the osteo-odonto-keratoprosthesis lamina; adoption of thicker laminae; use of bisphosphonate drugs; advances in laminar imaging; and use of bone augmentation and bone morphogenetic protein have been described for prevention, detection, and management of laminar resorption...
April 24, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28441068/a-controlled-randomized-double-blind-study-to-evaluate-the-safety-and-efficacy-of-chitosan-n-acetylcysteine-for-the-treatment-of-dry-eye-syndrome
#14
Doreen Schmidl, René Werkmeister, Semira Kaya, Angelika Unterhuber, Katarzyna J Witkowska, Renate Baumgartner, Sonja Höller, Maria O'Rourke, Ward Peterson, Annika Wolter, Martin Prinz, Leopold Schmetterer, Gerhard Garhöfer
PURPOSE: This study was designed to evaluate the effect of chitosan-N-acetylcysteine (C-NAC) eye drops on tear film thickness (TFT) in patients with dry eye syndrome (DES). METHODS: This was a controlled, randomized, double-blind clinical investigation with patients assigned to 2 cohorts. In Cohort I, 21 patients were randomized to receive 1 instillation of C-NAC eye drops in 1 eye and placebo (normal saline solution) in the contralateral eye. In Cohort II, 17 patients were randomized to receive C-NAC eye drops once (QD) or twice (BID) daily for 5 days...
April 25, 2017: Journal of Ocular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28441067/anterior-segment-optical-coherence-tomography-angiography-for-identification-of-iris-vasculature-and-staging-of-iris-neovascularization-a-pilot-study
#15
Philipp K Roberts, Debra A Goldstein, Amani A Fawzi
Purpose/Aim of the study: To assess the ability of optical coherence tomographic angiography (OCTA) to visualize the normal iris vasculature as well as neovascularization of the iris (NVI). MATERIALS AND METHODS: Study participants with healthy eyes, patients at risk of NVI development and patients with active or regressed NVI were consecutively included in this cross-sectional observational study. Imaging was performed using a commercially available OCTA system (RTVue- XR Avanti, Optovue Inc...
April 25, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28441014/chemistry-inspired-adaptable-framework-structures
#16
Zhiguo Xia, Kenneth R Poeppelmeier
Adaptable crystalline frameworks are important in modern solid-state chemistry as they are able to accommodate a wide range of elements, oxidation states, and stoichiometries. Owing to this ability, such adaptable framework structures are emerging as the prototypes for technologically important advanced functional materials. In this Account, the idea of cosubstitution is explored as a useful "pairing" concept that can potentially lead to the creation of many new members of one particular framework structure...
April 25, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28440793/wavelength-dependent-plasmon-mediated-coalescence-of-two-gold-nanorods
#17
Jiunn-Woei Liaw, Wu-Chun Lin, Mao-Kuen Kuo
Plasmon-mediated coalescence of two nearby gold nanorods (NRs) suspended in water induced by the illumination of a linearly polarized (LP) light was studied theoretically. We analyzed the coupled optical forces and torques in terms of Maxwell's stress tensor upon two identical NRs irradiated by a LP plane wave using the multiple multipole method to estimate the optomechanical outcome. Numerical results show that the light-matter interaction can perform attraction or repulsion, depending on their initial configurations...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440658/revealing-large-scale-homogeneity-and-trace-impurity-sensitivity-of-gaas-nanoscale-membranes
#18
Zhuo Yang, Alessandro Surrente, Gözde Tütüncüoglu, Krzysztof Galkowski, Melanie Cazaban-Carrazé, Francesca Amaduzzi, Pierre Leroux, Duncan K Maude, Anna Fontcuberta I Morral, Paulina Plochocka
III-V nanostructures have the potential to revolutionize optoelectronics and energy harvesting. For this to become a reality, critical issues such as reproducibility and sensitivity to defects should be resolved. By discussing the optical properties of MBE grown GaAs nanomembranes we highlight several features that bring them closer to large scale applications. Uncapped membranes exhibit a very high optical quality, expressed by extremely narrow neutral exciton emission, allowing the resolution of the more complex excitonic structure for the first time...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28440638/dielectric-relaxation-of-the-ionic-liquid-1-ethyl-3-methylimidazolium-ethylsulfate-microwave-and-far-ir-properties
#19
Nilesh Ramchandra Dhumal, Johannes Kiefer, David Andrew Turton, Klaas Wynne, Hyung J Kim
Dielectric relaxation of the ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate (EMI(+)ETS(-)), is studied using molecular dynamics (MD) simulations. The collective dynamics of polarization arising from cations and anions are examined. Character- istics of the rovibrational and translational components of polarization dynamics are analyzed to understand their respective roles in the microwave and terahertz regions of dielectric relaxation. The MD results are compared with the experimental low- frequency spectrum of EMI(+)ETS(-), obtained via ultrafast optical Kerr effect (OKE) measurements...
April 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28440618/design-of-antibacterial-polyethersulfone-membranes-via-covalently-attaching-hydrogel-thin-layers-loaded-with-ag-nanoparticles
#20
Min He, Qian Wang, Rui Wang, Yi Xie, Weifeng Zhao, Changsheng Zhao
In order to inhibit the bacteria attachment and the subsequent formation of bio-films on polyethersulfone (PES) membranes, poly(sulfobetaine methacrylate) (PSBMA)/poly(sodium acrylate) (PAANa) antibacterial hydrogel thin layers were covalently attached onto the membranes, followed by loading Ag nanoparticles. In our strategy, double bonds were firstly introduced onto PES membrane surfaces to provide anchoring sites, and then the hydrogel layers were synthesized on the membrane surfaces via UV light initiated cross-linking copolymerization...
April 25, 2017: ACS Applied Materials & Interfaces
keyword
keyword
112894
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"