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Red dot

Nagamalai Vasimalai, Vânia Vilas-Boas, Juan Gallo, María de Fátima Cerqueira, Mario Menéndez-Miranda, José Manuel Costa-Fernández, Lorena Diéguez, Begoña Espiña, María Teresa Fernández-Argüelles
Carbon dots have demonstrated great potential as luminescent nanoparticles in bioapplications. Although such nanoparticles appear to exhibit low toxicity compared to other metal luminescent nanomaterials, today we know that the toxicity of carbon dots (C-dots) strongly depends on the protocol of fabrication. In this work, aqueous fluorescent C-dots have been synthesized from cinnamon, red chilli, turmeric and black pepper, by a one-pot green hydrothermal method. The synthesized C-dots were firstly characterized by means of UV-vis, fluorescence, Fourier transform infrared and Raman spectroscopy, dynamic light scattering and transmission electron microscopy...
2018: Beilstein Journal of Nanotechnology
Xue-Ping Cai, Bin Zhang, Xiao-Bo Chen, Hai-Yang Ding, Bing-Ren Gu, Hong-Ping Xie
Cationic poly-diallyldimethylammonium (PDADMAC), green CdTe quantum dots (QDs) or red CdS coated CdTe QDs, and anionic polyacrylic acid (PAA) were respectively assembled on the nano-carrier SiO2 to prepare green fluorescence composite nanoparticles (GF-QDs) and red ones (RF-QDs) with the structure SiO2 /PDADMAC/QD/PDADMAC/PAA. The sandwich structure "PDADMAC/QD/PDADMAC" on the nano-carrier not only realized the protection to fluorescence of QDs but also avoided the fluorescence shielding of silica shell for the assembled QDs...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Chenwen Xiao, Ling Li, Limin Lao, Yan Liu, Qiang Wei, Quan'an Ji, Guochang Sun, Fucheng Lin, Jiaoyu Wang, Guolian Bao
Trichophyton mentagrophytes is a fungus that causes skin disease in humans and other animals worldwide. Studies on molecular biology and fluorescent labeling of the fungus are limited. Here, we applied mCherry for the first time in T. mentagrophytes to label the fungus and its organelles. We constructed four expression vectors of mCherry or mCherry fusions containing a variety of resistance markers and promoters, which were then integrated, together with two previous mCherry expression vectors, in T. mentagrophytes via Agrobacterium tumefaciens-mediated transformation (AtMT)...
March 1, 2018: FEMS Microbiology Letters
JunJun Liu, Daowei Li, Kai Zhang, Mingxi Yang, Hongchen Sun, Bai Yang
Carbon dots with long-wavelength emissions, high quantum yield (QY) and good biocompatibility are highly desirable for biomedical applications. Herein, a green, facile hydrothermal synthesis of highly efficient red emissive nitrogen-doped carbonized polymer dots (CPDs) with optimal emission at around 630 nm are reported. The red emissive CPDs possess a variety of superior properties including excellent water dispersibility, good biocompatibility, narrow bandwidth emission, an excitation-independent emission, and high QY (10...
March 6, 2018: Small
Nanasaheb Shinde, Qi Xun Xia, Je Moon Yun, Rajaram Mane, Kwang Ho Kim
Superfast (10 min) room-temperature (300 K) chemical synthesis of 3-D polycrystalline and mesoporous bismuth(III) oxide (Bi2O3) nanostructured negatrode (as an abbroviation of negative electrode) materials, viz. coconut-shell, marigold, rose, and honey-nest cross-sections with different surface areas, charge transfer resistances, and electrochemical performances essential for energy storage, harvesting, and even catalysis devices, are directly grown onto Ni-foam without and with poly(ethylene glycol), ethylene glycol, and ammonium fluoride surfactants, respectively...
February 27, 2018: ACS Applied Materials & Interfaces
Qingdi Zhu, Lihong Zhang, Krystyn J Van Vliet, Ali Miserez, Niels Holten-Andersen
Polymers that confer changes in optical properties in response to chemical or mechanical cues offer diverse sensing applications, particularly if this stimuli response is accessible in humid or aqueous environments. Here, luminescent hydrogels were fabricated using a facile aqueous process by incorporating lanthanide ions and carbon dots (CD) into a network of polyacrylamide and poly(acrylic acid). White luminescence was obtained by tuning the balance of blue light-emitting CD to green and red light-emitting lanthanide ions...
February 26, 2018: ACS Applied Materials & Interfaces
Tzu-Chan Wu, Keng-Liang Wu, Wen-Long Hu, Jer-Ming Sheen, Cheng-Nan Lu, John Y Chiang, Yu-Chiang Hung
BACKGROUND: Upper gastrointestinal disorders are common in clinical practice, for example, gastritis, peptic ulcer disease, and gastroesophageal reflux disease. Panendoscopy or upper gastrointestinal endoscopy is viewed as the primary tool for examining the upper gastrointestinal mucosa, and permitting biopsy and endoscopic therapy. Although panendoscopy is considered to be a safe procedure with minimal complications, there are still some adverse effects, and patients are often anxious about undergoing invasive procedures...
January 2018: Medicine (Baltimore)
Feng Li, Chao Nie, Lai You, Xiao Jin, Qin Zhang, Yuancheng Qin, Feng Zhao, Yinglin Song, Zhongping Chen, Qinghua Li
White light emitting diodes (WLEDs) based on quantum dots (QDs) are emerging as robust candidates for white light source, however they are suffering from the problem of energy loss resulted from the re-absorption and self-absorption among the employed QDs of different peak wavelengths. It still remains a challenging task to construct WLEDs based on single-phase QD emitters. Here, CdS QDs with short synthesis time is introduced to the fabrication of WLEDs. With short synthesis time, on one hand, CdS QD of small diameter with blue emission can be obtained...
February 22, 2018: Nanotechnology
Sarah Beck, Matthew A Wyon, Emma Redding
Beck, S, Wyon, MA, and Redding, E. Changes in energy demand of dance activity and cardiorespiratory fitness during 1 year of vocational contemporary dance training. J Strength Cond Res 32(3): 841-848, 2018-Previous literature has demonstrated that the intensity of dance class as well as its discontinuous nature is not sufficient to elicit an aerobic training response and that the aerobic capacity of dancers is relatively low. These findings have raised questions on the suitability of training, through class and rehearsal, as adequate preparation for the physical demands of performance and a sustained, successful career in dance...
March 2018: Journal of Strength and Conditioning Research
Victoria Billero, Kate E Oberlin, Mariya Miteva
No abstract text is available yet for this article.
January 2018: Skin Appendage Disorders
Yugang Zhang, Guopeng Li, Ting Zhang, Zihang Song, Hui Wang, Zhongping Zhang, Yang Jiang
The selenium dioxide was used as the precursor to synthesize wide-size-ranged CdSe quantum dots (2.4-5.7 nm) via hot-injection route. The CdSe quantum dots are featured with high crystalline, monodisperse, zinc blende structure and wide emission region (530-635 nm). In order to improve the stability and quantum yield, a phosphine-free single-molecular precursor approach is used to obtain CdSe/CdS core/shell quantum dots. The CdSe/CdS quantum dots are highly fluorescent with quantum yield up to 65%, and persist the good monodispersity and high crystallinity...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Jinyang Zhu, Xue Bai, Xu Chen, Zhifeng Xie, Yongsheng Zhu, Gencai Pan, Yue Zhai, Hanzhuang Zhang, Biao Dong, Hongwei Song
Carbon dots (CDs) have attracted extensive attention over the past decade due to their excellent advantages. However, few attempts have been reported for realizing the long-wavelength emission, especially for obtaining efficient solid-state red emission with high photoluminescence quantum yield (QY). Herein, we developed highly red light emitting CDs by the step-by-step surface modifications of the nitrogen-doped CDs. By introducing hexadecyltrimethyl ammonium bromide to modulate a red CD aqueous solution, the photoluminescence QY increases from 23...
February 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Dhamodaran Manikandan, D W Boukhvalov, S Amirthapandian, I S Zhidkov, A I Kukharenko, S O Cholakh, E Z Kurmaev, Ramaswamy Murugan
SnO 2 and Mn-doped SnO 2 single-phase tetragonal crystal structure quantum dots (QDs) of uniform size with control over dopant composition and microstructure were synthesized using the high pressure microwave synthesis technique. On a broader vision, we systematically investigated the influence of dilute Mn ions in SnO 2 under the strong quantum confinement regime through various experimental techniques and density functional theoretical (DFT) calculations to disclose the physical mechanism governing the observed ferromagnetism...
February 15, 2018: Physical Chemistry Chemical Physics: PCCP
Qunying Zeng, Zhongwei Xu, Congxiu Zheng, Yang Liu, Wei Chen, Tailiang Guo, Fushan Li, Chaoyu Xiang, Yixing Yang, Weiran Cao, Xiangwei Xie, Xiaolin Yan, Lei Qian, Paul Holloway
A solution-processed molybdenum oxide (MoOx) as the hole injection layer by doctor-blade coating was developed to improve the efficiency and lifetime of red emitting quantum-dot light emitting diodes (QD-LEDs). It has been demonstrated that by adding isopropyl alcohol into the MoOx precursor during doctor-blade coating process, the morphology, composition, and the surface electronic structure of MoOx hole injection layer could be tailored. High quality MoOx film with optimized charge injection was obtained, based on which all-solution-processed highly efficient red emitting QD-LEDs were realized by using low-cost doctor-blade coating technique at ambient conditions...
February 9, 2018: ACS Applied Materials & Interfaces
Jingbin Huang, Qingfeng Li, Jia Wang, Lin Jin, Boshi Tian, Chunyang Li, Yurong Shi, Zhenling Wang, Jianhua Hao
Lanthanide ion (Yb3+, Er3+) co-doped AWO4 (A = Ca, Sr, Ba) up-conversion (UC) luminescent materials have been synthesized using a hydrothermal method and characterized by various microstructural and optical techniques. The results indicate that AWO4:Yb3+,Er3+ samples have an identical body-centered tetragonal scheelite structure with different morphologies, including CaWO4:Yb3+,Er3+ microspheres, dumbbell-like SrWO4:Yb3+,Er3+ and bipyramid-like BaWO4:Yb3+,Er3+. These samples exhibit visible emissions via an UC process under near-infrared (NIR) light (980 nm) excitation...
February 9, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Ying Nan Zhang, Yu Sheng Liu, Min Ming Yan, You Wei, Qi Lun Zhang, Yong Zhang
The utilization of triplet excitons plays a key role in obtaining highly efficient quantum-dot light-emitting diodes (QD-LEDs). However, to date, only phosphorescent materials have been implemented to harvest the triplet excitons in QD-LEDs. In this work, we introduced a thermally activated delayed fluorescence (TADF) emitter, 4,5-di(9H-carbazol-9-yl)phthalonitrile (2CzPN), doped into poly(N-vinylcarbazole) (PVK) as exciton harvester in red QD-LEDs by solution-processed. As a result, electrons leaking to PVK layer will be trapped by 2CzPN to form long lifetime TADF excitons in 2CzPN:PVK layer and then these harvesting exciton energy can be effectively transferred to the adjacent QDs by Förster resonance energy transfer process...
February 7, 2018: ACS Applied Materials & Interfaces
Di Li, Pengtao Jing, Lihuan Sun, Yang An, Xinyan Shan, Xinghua Lu, Ding Zhou, Dong Han, Dezhen Shen, Yuechen Zhai, Songnan Qu, Radek Zbořil, Andrey L Rogach
Carbon dots (CDs) have significant potential for use in various fields including biomedicine, bioimaging, and optoelectronics. However, inefficient excitation and emission of CDs in both near-infrared (NIR-I and NIR-II) windows remains an issue. Solving this problem would yield significant improvement in the tissue-penetration depth for in vivo bioimaging with CDs. Here, an NIR absorption band and enhanced NIR fluorescence are both realized through the surface engineering of CDs, exploiting electron-acceptor groups, namely molecules or polymers rich in sulfoxide/carbonyl groups...
February 7, 2018: Advanced Materials
Rachita S Dhurat, Sujit J S Shanshanwal, Ameet L Dandale
Background: Cosmetic deformities can result from various types of alopecia or even post hair transplantation procedures. Patients with such deformities seek aesthetically appealing longer-lasting options. Scalp concealers are commonly used by men and women to camouflage these deformities. Scalp micropigmentation (SMP) is one of the concealers recently gaining popularity. Objectives: SMP is a novel technique wherein microdot tattoos are placed in a stippling pattern to mimic hair follicles that are cut close to the scalp and various variables affecting its outcome were evaluated...
July 2017: Journal of Cutaneous and Aesthetic Surgery
Lizhen Liao, Xiaodong Zhuang, Weidong Li, Qibiao Su, Jie Zhao, Ying Liu
Polysaccharide from Fuzi (FPS) is a water‑soluble polysaccharide isolated from the traditional Chinese herbal medicine Fuzi. It has been demonstrated to protect hepatocytes against ischemia‑reperfusion injury through its potent antioxidant effects, and to attenuate starvation‑induced cytotoxicity in H9c2 cells by increasing autophagic activity. In the present study, Alizarin Red S staining was used to detect mineral deposition and reverse transcription‑quantitative polymerase chain reaction was used to detect the core binding factor α1 and smooth muscle 22α mRNA expression...
January 25, 2018: Molecular Medicine Reports
Ruma Das, Gone Rajender, P K Giri
We explore the mechanism of the fluorescence enhancement and fluorescence quenching effect of single walled carbon nanotubes (SWCNTs) on highly fluorescent graphene quantum dots (GQDs) over a wide range of concentrations of SWCNTs. At very low concentrations of SWCNTs, the fluorescence intensity of the GQDs is enhanced, while at higher concentrations, systematic quenching of fluorescence is observed. The nature of the Stern-Volmer plot for the latter case was found to be non-linear indicating a combined effect of dynamic and static quenching...
January 29, 2018: Physical Chemistry Chemical Physics: PCCP
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