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Conghui Yuan, Tong Wu, Jie Mao, Ting Chen, Yuntong Li, Min Li, Yiting Xu, Birong Zeng, Weiang Luo, Lingke Yu, Gaofeng Zheng, Lizong Dai
Core-shell structures are of particular interest in the development of advanced composite materials as they can efficiently bring different components together at nanoscale. The advantage of this structure greatly relies on the crucial design of both core and shell, thus achieving an inter-component synergistic effect. In this report, we show that decorating semiconductor nanocrystals with a boronate polymer shell can easily achieve programmable core-shell interactions. Taking ZnO and anatase TiO2 nanocrystals as inner core examples, the effective core-shell interactions can narrow the band gap of semiconductor nanocrystals, change the HOMO and LUMO levels of boronate polymer shell and significantly improve the carrier density of core-shell particles...
May 24, 2018: Journal of the American Chemical Society
Anthony Fiorino, Dakotah Thompson, Linxiao Zhu, Rohith Mittapally, Svend-Age Biehs, Odile Bezencenet, Nadia El-Bondry, Shailendra Bansropun, Philippe Ben-Abdallah, Edgar Meyhofer, Pramod Reddy
In this work we demonstrate thermal rectification at the nanoscale between doped Si and VO2 surfaces. Specifically, we show that the metal-insulator transition of VO2 makes it possible to achieve large differences in the heat flow between Si and VO2 when the direction of the temperature gradient is reversed. We further show that this rectification increases at nanoscale separations, with a maximum rectification coefficient exceeding 50% at ∼140 nm gaps and a temperature difference of 70 K. Our modeling indicates that this high rectification coefficient arises due to broadband enhancement of heat transfer between metallic VO2 and doped Si surfaces, as compared to narrower-band exchange that occurs when VO2 is in its insulating state...
May 23, 2018: ACS Nano
Haluk Dinçalp, Gözde Murat Saltan, Ceylan Zafer, Adem Mutlu
Five isoindigo-based donor-acceptor-donor (D-A-D) type small molecules have been synthesized in order to investigate their intramolecular charge transfer characteristics. UV-vis absorption of these dyes exhibits a wide absorption band ranging from 300 to 650 nm with two distinct bands, giving the narrow bandgaps between 1.72 and 1.85 eV. Taking into account their HOMO-LUMO energy levels and bandgaps, isoindigo dyes have been used in the active layer of organic solar cell (OSC) devices. When these small molecule semiconductors were used as acceptors with the donor poly(3-hexylthiophene-2,5-diyl (P3HT) polymer in the inverted OSC devices, the highest power conversion efficiency (PCE) was obtained as 0...
May 19, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Gang Wang, Yu-Sheng Wang, Emily Kay Huang, Weilun Hung, Kai-Lin Chao, Ping-Yeh Wu, Yi-Hsin Chen, Ite A Yu
We present high-contrast electromagnetically-induced-transparency (EIT) spectra in a heated vapor cell of single isotope 87 Rb atoms. The EIT spectrum has both high resonant transmission up to 67% and narrow linewidth of 1.1 MHz. We get rid of the possible amplification resulted from the effects of amplification without population inversion and four-wave mixing. Therefore, this high transmitted light is not artificial. The theoretical prediction of the probe transmission agrees well with the data and the experimental parameters can be derived reasonably from the model...
May 21, 2018: Scientific Reports
Kazuyoshi Kitazaki, Atsushi Fukushima, Ryo Nakabayashi, Yozo Okazaki, Makoto Kobayashi, Tetsuya Mori, Tomoko Nishizawa, Sebastian Reyes-Chin-Wo, Richard W Michelmore, Kazuki Saito, Kazuhiro Shoji, Miyako Kusano
Light-emitting diodes (LEDs) are an artificial light source used in closed-type plant factories and provide a promising solution for a year-round supply of green leafy vegetables, such as lettuce (Lactuca sativa L.). Obtaining high-quality seedlings using controlled irradiation from LEDs is critical, as the seedling health affects the growth and yield of leaf lettuce after transplantation. Because key molecular pathways underlying plant responses to a specific light quality and intensity remain poorly characterised, we used a multi-omics-based approach to evaluate the metabolic and transcriptional reprogramming of leaf lettuce seedlings grown under narrow-band LED lighting...
May 21, 2018: Scientific Reports
David Martin, Anya Hurlbert, David Andrew Cousins
Psychiatric inpatient units often maintain a degree of lighting at night to facilitate the observation of patients, but this has the potential to disrupt sleep. Certain wavelengths of light may be less likely to disturb sleep and if such lighting permitted adequate observations, patient wellbeing may be improved. AIMS AND METHOD: This study explored the effects of changing night-lights from broad-band white to narrow-band red on the amount of sleep observed, 'as required' medication administered and number of falls, in an old age psychiatry inpatient setting...
June 2018: Archives of Psychiatric Nursing
Tuhin Shuvra Basu, Simon Diesch, Elke Scheer
We have fabricated organically capped stable luminescent silicon nanocrystals with narrow size distribution by a novel, high yield and easy to implement technique. We demonstrate transport measurements of individual silicon nanocrystals by scanning tunnelling microscopy at a low temperature in a double-barrier tunnel junction arrangement in which we observed pronounced single electron tunnelling effects. The tunnelling spectroscopy of these nanocrystals with different diameters reveals quantum confinement induced bandgap modifications...
May 21, 2018: Nanoscale
Xiaowei Li, Paul D McNaughter, Paul O'Brien, Hiro Minamimoto, Kei Murakoshi
Electromotive force of photovoltaics is a key to define the output power density of photovoltaics. Multiple exciton generation (MEG) exhibited by semiconductor quantum dots (QDs) has great potential to enhance photovoltaic performance owing to the ability to generate more than one electron-hole pairs when absorbing a single photon. However, even in MEG-based photovoltaics, limitation of modifying the electromotive force exists due to the intrinsic electrochemical potential of the conduction band-edges of QDs...
May 21, 2018: Physical Chemistry Chemical Physics: PCCP
Nicole Proulx, Ali-Akbar Samadani, Tom Chau
Event-related potentials (ERPs) have previously been used to confirm the existence of the fast optical signal (FOS) but validation methods have mainly been limited to exploring the temporal correspondence of FOS peaks to those of ERPs. The purpose of this study was to systematically quantify the relationship between FOS and ERP responses to a visual oddball task in both time and frequency domains. Near-infrared spectroscopy (NIRS) and electroencephalography (EEG) sensors were co-located over the prefrontal cortex while participants performed a visual oddball task...
May 16, 2018: NeuroImage
Tony Ma, Lenore Ellett, Kate McIlwaine, Janine Manwaring, Alex Eskander, Prathima Chowdary, Emma Readman, Peter Maher
STUDY OBJECTIVE: To assess the utility of narrow band imaging (NBI) to detect additional areas of endometriosis not identified by standard white light in patients undergoing laparoscopy for investigation of pelvic pain. DESIGN: Prospective cohort trial DESIGN CLASSIFICATION: Level II: Evidence obtained from well-designed cohort study. SETTING: Tertiary laparoscopic sub-specialty unit in Melbourne, Australia. PATIENTS: Fifty-seven patients undergoing laparoscopy for investigation of pelvic pain were recruited...
May 15, 2018: Journal of Minimally Invasive Gynecology
Guifang Ge, Xinwen Guo, Chunshan Song, Zhongkui Zhao
Developing a facile method to overcome the intrinsic shortcomings of g-C3N4 photocatalyst concerning its insufficient visible-light absorption and dissatisfactory separation efficiency of charge carriers is of great significance but remains a challenge. In this work, we report, for the first time, a sapiential strategy for preparing highly-efficient nitrogen deficient g-C3N4 featuring bunchy microtubes (R-TCN) via a KOH-assisted hydrothermal treatment of rodlike melamine-cyanuric acid supramolecular aggregates (RMCA) followed by heating the reconstructed RMCA, in which KOH serves as an all-rounder for breaking hydrogen bonds, accelerating hydrolysis of melamine and nitrogen defects forming...
May 18, 2018: ACS Applied Materials & Interfaces
J H Wu, X Y Luo
Objective: To explore the role of narrow band imaging (NBI) endoscopy in the diagnosis of oropharyngeal and laryngopharyngeal lesions. Method: NBI and white light (WLI) endoscopy were performed on 90 patients with oropharyngeal and laryngopharyngeal lesions from August 2016 to May 2017. NBI findings were classified into 5 types according to the Ni classification and were compared with histopathological results. Accuracy of NBI on premalignant and malignant lesions were compared with WLI. The connection between NBI findings and phathological results were explored...
May 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
L Wang, Y N Xue, Z W Li, W Zhang, X P Ji, Z Fan, Y J Li
Pityriasis rosea (PR), a skin rash, causes substantial discomfort in patients. There is a lack of effective therapies for PR. A combination of ultraviolet irradiation and indigo naturalis treatment has been shown to be a safe and effective regime for control of PR; however, the data have been largely inconsistent. Tis meta-analysis further evaluated the efficacy and safety of this combination in patients with PR. The PubMed, Embase, Cochrane Library, CNKI, VIP, and Wan Fang databases were searched for relevant RCTs of this combination therapy in patients with PR...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
Philipp Strobel, Christian Maak, Volker Weiler, Peter J Schmidt, Wolfgang Schnick
Highly efficient phosphor-converted light-emitting diodes (pc-LEDs) are popular in lighting and high-tech electronics applications. The main goals of present LED research are increasing light quality, preserving color point stability and reducing energy consumption. For those purposes excellent phosphors in all spectral regions are required. Here, we report on ultra-narrow band blue emitting oxoberyllates AELi2[Be4O6]:Eu2+ (AE = Sr,Ba) exhibiting a rigid covalent network isotypic to the nitridoalumosilicate BaLi2[(Al2Si2)N6]:Eu2+...
May 16, 2018: Angewandte Chemie
Krishna Kumar Rai, Nagendra Rai, Shashi Pandey Rai
Salicylic acid (SA) and sodium nitroprusside (SNP, NO donor) modulates plant growth and development processes and recent findings have also revealed their involvement in the regulation of epigenetic factors under stress condition. In the present study, some of these factors were comparatively studied in hyacinth bean plants subjected to high temperature (HT) environment (40-42 °C) with and without exogenous application of SA and SNP under field condition. Exogenous application of SA and SNP substantially modulated the growth and biophysical process of hyacinth bean plants under HT environment...
April 26, 2018: Plant Physiology and Biochemistry: PPB
Chunzhi Cui, Na Yeon Hong, Dong June Ahn
The present study reports a quantified monitoring by means of in situ resonance Raman scattering that analyzes phase-shifting characteristics of π-systems upon interacting with target analytes. A chemo- and thermochromic polydiacetylene vesicular probe is evaluated with multiple-wavelength Raman scattering modes in resonance with its phases, respectively, and thus can trace the phase-shifts. This Raman scattering-based analytical quantification is also successful in monitoring host-guest recognition events by utilizing much narrower bands, compared to those in conventional absorption or photoluminescence (PL) methods...
May 14, 2018: Small
Sapana Jadoun, Liza Biswal, Ufana Riaz
Tailoring of conjugated monomers via copolymerization is a facile method to obtain tunable spectral, morphological and optical properties. To investigate the effect of copolymerization of pyrrole with o-phenylenediamine on the optoelectronic properties of the synthesized copolymers, the present work reports the synthesis of copolymers of o-phenylenediamine with pyrrole with varying mol ratios via chemical polymerization in methylene blue (MB) medium. Copolymerization was confirmed by Fourier transform infrared spectroscopy and ultraviolet-visible studies...
2018: Designed Monomers and Polymers
F M J Cozijn, P Dupré, E J Salumbides, K S E Eikema, W Ubachs
Weak transitions in the (2,0) overtone band of the hydrogen deuteride molecule at λ=1.38  μm were measured in saturated absorption using the technique of noise-immune cavity-enhanced optical heterodyne molecular spectroscopy. Narrow Doppler-free lines were interrogated with a spectroscopy laser locked to a frequency comb laser referenced to an atomic clock to yield transition frequencies [R(1)=217105181895(20)  kHz; R(2)=219042856621(28)  kHz; R(3)=220704304951(28)  kHz] at three orders of magnitude improved accuracy...
April 13, 2018: Physical Review Letters
Y Pan, W M Guan
The intermediate product Li2 S2 plays a pivotal role in the charge/discharge process of lithium-sulfur batteries. However, the structural configuration and relevant properties of Li2 S2 are unclear. In this work, by using ab initio calculations, we present results of novel phases, average open circuit voltages ( Voc s), and electronic properties of the stable Li2 S2 . Two new Li2 S2 phases are predicted: orthorhombic ( Cmca) and orthorhombic ( Immm) structures. The calculated Voc s of hexagonal ( P63 / mmc), orthorhombic ( Cmca), and orthorhombic ( Immm) are 3...
May 14, 2018: Inorganic Chemistry
Anna Rzepakowska, Ewelina Sielska-Badurek, Michal Żurek, Ewa Osuch-Wójcikiewicz, Kazimierz Niemczyk
BACKGROUND: This study investigates relevance of narrow band imaging (NBI) in stratifying risk of malignant transformation within leukoplakia. METHODS: We conducted a prospective analysis that included 62 patients with 91 changes of leukoplakia on vocal folds. The NBI was obtained before microsurgery. Categorization of the lesion as benign was made when vessels of surrounding epithelium were classified as type I, II, or IV according to Ni classification. If there were visualized intraepithelial papillary capillary loops of type V, the lesion was classified as malignant...
May 13, 2018: Head & Neck
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