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Xiaorui Zheng, Binke Ning, Chao Xue, Lieping Wang, Wei Wang, Kangyun Liu, Xiao-Ying Huang, Yadong Liu
A new platinum(ii) complex containing a quaternary ammonium group was synthesized. The monomer and excimer emission of the complex could be tuned via the solvophobic effect, which was accompanied by transformation from a fiber to ribbon-like morphology.
May 17, 2018: Soft Matter
Tetsumin Lee, Richard A Shlofmitz, Lei Song, Theofanis Tsiamtsiouris, Thomas Pappas, Antonio Madrid, Allen Jeremias, Elizabeth S Haag, Ziad A Ali, Jeffery W Moses, Mitsuaki Matsumura, Gary S Mintz, Akiko Maehara
AIMS: We evaluated the effectiveness of excimer laser coronary angioplasty (ELCA) to treat in-stent restenosis (ISR) due to peri-stent calcium-related stent under-expansion as assessed by optical coherence tomography (OCT). METHODS AND RESULTS: We studied 81 patients (81 lesions with ISR, stent under-expansion, and peri-stent calcium >90°) who underwent OCT imaging both pre- and post-percutaneous coronary intervention and compared lesions treated with ELCA (n=23) vs without ELCA (n=58)...
May 15, 2018: EuroIntervention
Álvaro González-Vila, Andreas Ioannou, Médéric Loyez, Marc Debliquy, Driss Lahem, Christophe Caucheteur
Surface plasmon resonance excitation with optical fiber gratings has been typically studied in aqueous solutions. This work describes the procedure to excite a plasmon wave in gaseous media and perform refractive index measurements in these environments. Grating photo-inscription with 193 nm excimer laser radiation allows us to obtain slightly tilted fiber Bragg gratings exhibiting a cladding mode resonance comb along several hundreds of nanometers. Their refractive index sensitive range extends from gases to liquids, so operation in both media is compared...
May 15, 2018: Optics Letters
Hajime Maeda, Tsubasa Suzuki, Masahito Segi
1,3,6,8-Tetrasilylpyrenes and related germyl and stannyl derivatives were synthesized, and their absorption and fluorescence spectroscopic and structural properties were elucidated. The results show that the UV-vis absorption maxima of these substances in CH2Cl2 solutions shift to longer wavelengths as the size of the alkyl groups and numbers of phenyl groups on silicon increase. Fluorescence quantum yields of tetrasilylpyrenes in cyclohexane are larger than that of pyrene, and a pentamethyldisilyl derivative has an emission efficiency of 0...
May 9, 2018: Photochemical & Photobiological Sciences
Jakob Siedlecki, Nikolaus Luft, Wolfgang J Mayer, Martin Siedlecki, Daniel Kook, Bertram Meyer, Martin Bechmann, Rainer Wiltfang, Siegfried G Priglinger, Martin Dirisamer
PURPOSE: To report the outcomes of enhancement after small incision lenticule extraction (SMILE) using the VisuMax CIRCLE option (Carl Zeiss Meditec AG, Jena, Germany), which converts the SMILE cap into a femtosecond LASIK flap for secondary excimer laser application. METHODS: Of 2,065 SMILE procedures, 22 eyes (1.1%) re-treated with CIRCLE with a follow-up of 3 months were included in the analysis. SMILE was performed in the usual manner. For re-treatment, the CIRCLE procedure was performed with pattern D flap creation on the VisuMax system and subsequent excimer laser ablation with a Zeiss MEL 90 laser (Carl Zeiss Meditec) with plano target in all cases...
May 1, 2018: Journal of Refractive Surgery
Yulong Zheng, Kort Bremer, Bernhard Roth
In this work we investigate the strain, temperature and humidity sensitivity of a Fiber Bragg Grating (FBG) inscribed in a near infrared low-loss multimode perfluorinated polymer optical fiber based on cyclic transparent optical polymer (CYTOP). For this purpose, FBGs were inscribed into the multimode CYTOP fiber with a core diameter of 50 µm by using a krypton fluoride (KrF) excimer laser and the phase mask method. The evolution of the reflection spectrum of the FBG detected with a multimode interrogation technique revealed a single reflection peak with a full width at half maximum (FHWM) bandwidth of about 9 nm...
May 5, 2018: Sensors
Hong-Ru Fu, Xiao-Xia Wu, Lu-Fang Ma, Fei Wang, Jian Zhang
In this study, a water stable metal-organic framework FIR-53 is applied as single-crystal container for anion exchange. The exceptional chemical stability and low crystallographic symmetry of FIR-53 makes it possible to determine anionic guests. Through ion exchange and single-crystal to single-crystal (SC-SC) transformation, 8-hydroxypyrene-1,3,6-trisulfonate, (SG7, solvent green 7, ion form as SG73-) is introduced into the pores of FIR-53 to obtain SG7@FIR-53. Due to the spatial confinement and partition effect, SG7@FIR-53 shows the bright pyrene exciter emission of SG7 ions...
May 7, 2018: ACS Applied Materials & Interfaces
Mark A Prelas, Modeste Tchakoua Tchouaso
This paper discusses the use of one of the safest isotopes known isotopes, Kr-85, as a candidate fuel source for deep space missions. This isotope comes from 0.286% of fission events. There is a vast quantity of Kr-85 stored in spent fuel and it is continually being produced by nuclear reactors. In using Kr-85 with a novel Dual Cycle Conversion System (DCCS) it is feasible to boost the system efficiency from 26% to 45% over a single cycle device while only increasing the system mass by less than 1%. The Kr-85 isotope is the ideal fuel for a Photon Intermediate Direct Energy Conversion (PIDEC) system...
April 26, 2018: Applied Radiation and Isotopes
Masaharu Tsuji, Takashi Kawahara, Keiko Uto, Naohiro Kamo, Masato Miyano, Jun-Ichiro Hayashi, Takeshi Tsuji
The photochemical removal of benzene was studied in air at atmospheric pressure using a side-on type 172 nm Xe2 excimer lamp with a wide irradiation area. After 1.5 min photoirradiation, C6 H6 (1000 ppm) in air was completely converted to HCOOH, CO, and CO2 at a total flow rate of 1000 mL/min. The initial decomposition rate of C6 H6 was determined to be 1.18 min-1 . By using a flow system, C6 H6 (200 ppm) was completely removed at a total flow rate of 250 mL/min. The conversion of C6 H6 and the energy efficiency in the removal of C6 H6 changed in the 31-100% and 0...
May 2, 2018: Environmental Science and Pollution Research International
Edward Manche, Joshua Roe
PURPOSE OF REVIEW: Laser vision correction remains an active area of research, and there have been many recent advances in the field. The purpose of this review is to provide an update on the recent advances for one of the most common methods of laser vision correction, wavefront-guided laser in-situ keratomileusis (LASIK). RECENT FINDINGS: Recent technological advancements in wavefront aberrometry are largely responsible for the improved visual outcomes that have been recently reported...
April 27, 2018: Current Opinion in Ophthalmology
M Kono, M Niizawa, T Takeichi, Y Muro, M Akiyama
A 79-year-old Japanese male (Case 1) had had repetitive erosions on the neck and trunk every summer for 13 years (Fig. 1a). A 69-year-old Japanese female (Case 2) had had recurrent erosions on the axillae, the inframammary areas and the groin every summer since her early sixties (Fig. 1d). The lesions of both patients revealed acantholysis and dyskeratosis in the epidermis (Fig. 1c, f). Neither patient had any family history of similar skin disorders. This article is protected by copyright. All rights reserved...
April 28, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
Giacomo Savini, Domenico Schiano-Lomoriello, Kenneth J Hoffer
PURPOSE: To evaluate the repeatability of automatic measurements by a new anterior segment optical coherence tomographer (AS-OCT) combined with Placido topography and their agreement with those provided by 2 rotating Scheimpflug cameras. SETTING: G.B. Bietti Foundation IRCCS, Rome, Italy. DESIGN: Evaluation of a diagnostic test instrument. METHODS: Unoperated eyes and eyes with previous myopic excimer laser surgery were analyzed...
April 25, 2018: Journal of Cataract and Refractive Surgery
Sebastian Schlangen, Kort Bremer, Yulong Zheng, Sebastian Böhm, Michael Steinke, Felix Wellmann, Jörg Neumann, Bernhard Roth, Ludger Overmeyer
Long-period fiber gratings (LPGs) are well known for their sensitivity to external influences, which make them interesting for a large number of sensing applications. For these applications, fibers with a high numerical aperture (i.e., fibers with highly germanium (Ge)-doped fused silica fiber cores) are more attractive since they are intrinsically photosensitive, as well as less sensitive to bend- and microbend-induced light attenuations. In this work, we introduce a novel method to inscribe LPGs into highly Ge-doped, single-mode fibers...
April 27, 2018: Sensors
Yu Gao, Haichao Liu, Shitong Zhang, Qiang Gu, Yue Shen, Yunpeng Ge, Bing Yang
Herein, density functional theory (DFT) computations were performed to investigate the discrete dimer of a mono-substituted anthracene derivative (2-TA-AN), which exhibited highly efficient pure excimer fluorescence in its crystal form. As a more practical model, its geometry, potential energy curve and excited state property were systematically calculated to better understand the excimer formation process and photophysical properties. The compressed excimer geometry is responsible for the highly efficient excimer emission, arising from the enhanced rigidity that greatly suppresses its non-radiative vibrations...
April 23, 2018: Physical Chemistry Chemical Physics: PCCP
Tomasz J Merta, Nicholas E Geacintov, Vladimir Shafirovich
The mechanistic aspects of one-electron oxidation of G-quadruplexes in the basket (Na+ ions) and hybrid (K+ ions) conformations were investigated by transient absorption laser kinetic spectroscopy and HPLC detection of the 8-oxo-7,8-dihydroguanine (8-oxoG) oxidation product. The photo-induced one-electron abstraction from G-quadruplexes was initiated by sulfate radical anions (SO4 •- ) derived from the photolysis of persulfate ions by 308 nm excimer laser pulses. In neutral aqueous solutions (pH 7.0), the transient absorbance of neutral guanine radicals, G(-H)• is observed following the complete decay of SO4 •- radicals (~10 μs after the actinic laser flash)...
April 21, 2018: Photochemistry and Photobiology
Jinhwan Kim, Jae-Hoon Ji, Gae-Hun Jo, Sung-Wook Min, Jung-Hyuk Koh
Laser direct patterning (LDP) technology has attracted great attention due to its process simplification and environmental friendliness. It is replacing the existing photo-lithography technology. Infrared (IR) laser equipment also has advantages such as low cost and long duration, although it is difficult to implement fine line width compared to ultraviolet (UV) or excimer laser. Therefore, it is very important to realize 3-D patterning system based on cheap infrared laser system. In this paper, 3-D infrared laser direct patterning system was designed by introducing an etching process on Ag paste/ITO/PET flexible film...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Ming-Shen Sun, Li Zhang, Ning Guo, Yan-Zheng Song, Feng-Ju Zhang
AIM: To evaluate and compare the uniformity of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided ablation of laser in situ keratomileusis (LASIK) by EX500 excimer laser for myopia. METHODS: Totally 145 cases (290 consecutive eyes )with myopia received LASIK with a target of emmetropia. The ablation for 86 cases (172 eyes) was guided manually based on Oculyzer topography (study group), while the ablation for 59 cases (118 eyes) was guided automatically by Topolyzer Vario topography (control group)...
2018: International Journal of Ophthalmology
Anna Maria Roszkowska, Mario Urso, Giuseppe Alberto Signorino, Leopoldo Spadea, Pasquale Aragona
AIM: To evaluate the efficacy and safety of the excimer laser correction of the residual refractive errors after cataract extraction with intraocular lens (IOL) implantation in uncommon cases. METHODS: Totally 24 patients with high residual refractive error after cataract surgery with IOL implantation were examined. Twenty-two patients had a history of phacoemulsification and IOL implantation, and two had extra-capsular cataract extraction with IOL implantation...
2018: International Journal of Ophthalmology
Beatriz Santiago-Gonzalez, Angelo Monguzzi, Chiara Capitani, Mirko Prato, Carlo Santambrogio, Francesco Meinardi, Sergio Brovelli
Metal cluster are promising nontoxic candidates in optoelectronics and photonics. Recently, clusters with appropriate molecular ligands have been demonstrated to be uniquely suitable as subnanometer building blocks for supramolecular architectures with controlled secondary interactions, providing access to physical regimes not achievable with conventional intermolecular motifs. A compelling example of this is the excimer photophysics exhibited by individual cluster-based superstructures produced by top-down etching of gold nanoparticles...
April 19, 2018: Angewandte Chemie
Yuening Zhang, Dong Yang, Jianlei Han, Jin Zhou, Qingxian Jin, Minghua Liu, Pengfei Duan
Soft nanomaterials with circularly polarized luminescence (CPL) have been currently attracting great interests. Here, we report a pyrene-containing π-peptide dendrons hydrogel, which showed 1D and 2D nanostructures with varied CPL activities. It was found that the individual dendron formed hydrogels in a wide pH range (3-12) and self-assembled into helices with pH-tuned pitches. Through chirality transfer, the pyrene unit could show CPL originated from both the monomer and excimer bands. When cyclodextrin was introduced, different supra-dendrons were obtained with β-cyclodextrin (PGAc@β-CD) and γ-cyclodextrin (PGAc@γ-CD) through host-guest interactions, respectively...
April 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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