Read by QxMD icon Read

Chemical luminescence

Haifang Liu, Zhaohui Li, Yuanqiang Sun, Xin Geng, Yalei Hu, Hongmin Meng, Jia Ge, Lingbo Qu
Carbon dots (CDs) have a wide range of applications in chemical, physical and biomedical research fields. We are particularly interested in the use of CDs as fluorescence nanomaterials for targeted tumor cell imaging. One of the important aspects of success is to enhance the fluorescence quantum yields (QY) of CDs as well as increase their targetability to tumor cells. However, most of the reported CDs are limited by relative low QY. In the current study, for the first time, one-step synthesis of highly luminescent CDs by using folic acid (FA) as single precursor was obtained in natural water through hydrothermal method...
January 18, 2018: Scientific Reports
Maria Marsova, Serikbay Abilev, Elena Poluektova, Valeriy Danilenko
Oxidative stress cause serious damages in human organism resulting in multiple diseases. Antioxidant therapy includes diet, the use of chemical agents or commensal bacteria such as lactobacilli. This study aims to evaluate the antioxidant (AO) activity of cell-free culture supernatants of lactobacilli, isolated from different parts of the human body. A test system based on Escherichia coli MG1655 strains carrying plasmids encoding luminescent biosensors pSoxS-lux and pKatG-lux inducible by superoxide anion and hydrogen peroxide, respectively, was used to analyze cell-free culture supernatants of lactobacilli...
January 17, 2018: World Journal of Microbiology & Biotechnology
Meiheng Lu, Panwang Zhou, Yinhua Ma, Zhe Tang, Yanqiang Yang, Keli Han
Rapid detection of chemical explosives is crucial for national security and public safety, and investigation of sensing mechanisms is important to design highly efficient chemosensors. This study theoretically investigates the detection and fluorescence mechanism of a newly synthesized pyrene based chemosensor for detection of trinitrotoluene (TNT) through density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods, suggesting a different interaction product of the probe and TNT from previously reported ones (Mosca, L...
January 16, 2018: Journal of Physical Chemistry. A
Rakesh Radhakrishnan, Kumaran G Sreejalekshmi
Probing chemical space of luminescent organic materials built on novel cores is highly imperative for its potential to expand the horizons of advanced functional materials. Small organic fluorophores possessing therapeutic traits can contribute to theranostics. We coupled computational and classical synthetic chemistry strategies for the rational design of 5-(hetero-2-yl)-1,3-thiazoles as colour tunable fluorophore core. With the aid of DFT and TD-DFT, we prove multiheterocyclic system built on thiazole-het core with three inherent tunable sites on thiazole (C2, C4 and C5) capable of accommodating panoply of substituents, as a multifunctional molecular materials' platform...
January 15, 2018: Journal of Organic Chemistry
Fang Zhao, Dario Cambié, Jeroen Janse, Eric W Wieland, Koen P L Kuijpers, Volker Hessel, Michael G Debije, Timothy Noël
The use of solar energy to power chemical reactions is a long-standing dream of the chemical community. Recently, visible-light-mediated photoredox catalysis has been recognized as the ideal catalytic transformation to convert solar energy into chemical bonds. However, scaling photochemical transformations has been extremely challenging due to Bouguer-Lambert-Beer law. Recently, we have pioneered the development of luminescent solar concentrator photomicroreactors (LSC-PMs), which display an excellent energy efficiency...
January 2, 2018: ACS Sustainable Chemistry & Engineering
Edmundo Percástegui, Carlos Reyes-Mata, Marcos Flores-Alamo, Beatriz Quiroz-García, Ernesto Rivera, Ivan Castillo
Self-assembly of bis-picolyl-appended calix[4]arene (L) with Cu(I) or Cu(II) salts resulted in a collection of multinuclear architectures capable of expressing structural reconfigurations in response to various chemical stimuli: addition of copper salt, solvents, or oxidation. Coordination of L to CuX (X = Br, I) selectively yielded dinuclear macrocycles Cu(I)₂L₂Br₂ (1) and Cu(I)₂L₂I₂ (3) that were transformed into tetranuclear assemblies Cu(I)₄L₂Br₄ (2) and Cu(I)₄L₂I₄ (4) upon further addition of CuX...
January 9, 2018: Chemistry, An Asian Journal
Christian Detellier
The world resources of all clays are extremely large. Among the various types of clays, the world mine production of kaolin in 2016 was 37.0 Mt, the largest mined clay. Kaolin is traditionally used in ceramics, refractories and as paper coating and filling. But kaolin, as it is demonstrated in this paper, has a bright potential for use in non-traditional, high value-added, applications. This is particularly true for its principal component: the mineral species kaolinite which has a chemical structure allowing its functionalization, leading to a variety of potential applications...
January 4, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Peiqing Cai, Xiangfu Wang, Hyo Jin Seo
A Mn4+ doped Na2WO2F4 phosphor was synthesized through a two-step wet chemical method. The relationship between crystal structure and luminescence properties is discussed and unusual strong intense zero phonon lines (ZPLs) have been found in a distorted octahedral environment. The power dependent luminescence spectra exhibit the existence of down conversion luminescence intensity saturation under a high pumping power limit. The fluorescence intensity ratios of anti-Stokes bands to the ZPL and Stokes bands reveal an obvious temperature dependent relationship based on thermal de-population from the low states to the upper states of an intrinsic Mn4+ 2Eg → 4A2g transition...
January 4, 2018: Physical Chemistry Chemical Physics: PCCP
Massimo Varisco, Denis Zufferey, Olimpia Mamula Steiner
Carbon nanodots can be obtained in good yields by direct combustion of an abundant waste from the wine industry, wine lees. The extraction of these nanoparticles followed by their chemical functionalization lead to an ink-jettable material emitting in the visible region (blue) under specific UV irradiation.
December 1, 2017: Chimia
B Naveen Kumar Reddy, S Sailaja, K Thyagarajan, Young Dahl Jho, B Sudhakar Reddy
Four series of borosilicate glasses modified by alkali oxides and doped with Tb3+ and Sm3+ ions were prepared using the conventional melt quenching technique, with the chemical composition 74.5B2 O3 + 10SiO2 + 5MgO + R + 0.5(Tb2 O3 /Sm2 O3 ) [where R = 10(Li2 O /Na2 O/K2 O) for series A and C, and R = 5(Li2 O + Na2 O/Li2 O + K2 O/K2 O + Na2 O) for series B and D]. The X-ray diffraction (XRD) patterns of all the prepared glasses indicate their amorphous nature. The spectroscopic properties of the prepared glasses were studied by optical absorption analysis, photoluminescence excitation (PLE) and photoluminescence (PL) analysis...
December 28, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Xiaoting Ma, Guannan Li, Jiawei Tao, Ping Li, Hongzhi Zheng, Shougui Li, Yan Xu
Higher-order organization of inorganic nanoparticles with hierarchical architectures and tailored functionality is crucial in the nanofabrication of advanced materials. Here we demonstrate that three-dimensional b-oriented MFI superstructures can be organized by synergistic chemical synthesis and self-assembly. The organization is accomplished by vapor treatment of tetrapropylammonium hydroxide (TPAOH)-coated inorganic/bacterial cellulose scaffolds. TPA+ acts to direct nucleation and to mediate crystal morphology leading to oriented assembly of MFI crystals along crystallographic b-axis, while bacterial cellulose holds the oriented assembly together forming three-dimensional superstructures with macroporosity...
December 27, 2017: Chemistry: a European Journal
Yao Yao, Loruhama Delgado-Rivera, Hamid Samareh Afsari, Liang Yin, Gregory R J Thatcher, Terry W Moore, Lawrence W Miller
Hydrogen sulfide (H2S) is now recognized as an important gaseous transmitter that is involved in a variety of biological processes. Here, we report the design and synthesis of a luminescent lanthanide biosensor for H2S, LP2-Cu(II)-Ln(III), a heterobinuclear metal complex that uses Cu(II) decomplexation to control millisecond-scale-lifetime-Tb(III)- or Eu(III)-emission intensity. LP2-Cu(II)-Ln(III) responded rapidly, selectively, and with high sensitivity to aqueous H2S. The probe's potential for biological applications was verified by measuring the H2S generated by the slow-releasing chemical-sulfide-donor GYY4147, by cystathionine γ-lyase (CSE), and by Na2S-stimulated HeLa cells...
December 27, 2017: Inorganic Chemistry
Yixi Zhuang, Ying Lv, Le Wang, Wenwei Chen, Tianliang Zhou, Takashi Takeda, Naoto Hirosaki, Rong-Jun Xie
Deep-trap persistent luminescence materials exhibit unique properties of energy storage and controllable photon release under additional stimulation, allowing for both wavelength and intensity multiplexing to realize high-capacity storage in the next-generation information storage system. However, the lack of suitable persistent luminescence materials with deep traps is the bottleneck of such storage technologies. In this paper, we successfully developed a series of novel deep-trap persistent luminescence materials in the Ln2+/Ln3+-doped SrSi2O2N2 system (Ln2+ = Yb, Eu; Ln3+ = Dy, Ho, Er) by applying the strategy of trap depth engineering...
December 26, 2017: ACS Applied Materials & Interfaces
Fabiola Navarro-Pardo, Haiguang Zhao, Zhiming M Wang, Federico Rosei
Semiconductor nanocrystals exhibit size-tunable absorption and emission ranging from the ultraviolet (UV) to the near-infrared (NIR) spectral range, high absorption coefficient, and high photoluminescence quantum yield. Effective surface passivation of these so-called quantum dots (QDs) may be achieved by growing a shell of another semiconductor material. The resulting core/shell QDs can be considered as a model system to study and optimize structure/property relations. A special case consists in growing thick shells (1...
December 20, 2017: Accounts of Chemical Research
Karan Kumar Gupta, R M Kadam, N S Dhoble, S P Lochab, S J Dhoble
The present paper reports on the γ-ray and C6+ ion beam induced effect on the structural and luminescence properties of Eu doped LiNaSO4 phosphors synthesized via wet the chemical method. The material was irradiated by 60Co and 137Cs γ-rays and 75 MeV C6+ ions in a fluence range varying from 2 × 1010 to 1 × 1012 ion per cm2. The ion induced modified properties were investigated using X-ray diffraction (XRD), micro-Raman spectroscopy, photoluminescence (PL), thermoluminescence (TL) and electron paramagnetic resonance (EPR) studies...
December 20, 2017: Physical Chemistry Chemical Physics: PCCP
Li-Lin Luo, Xiang-Long Qu, Zheng Li, Xia Li, Hao-Ling Sun
A series of the anhydrous lanthanide-based metal-organic frameworks (Ln-MOFs) were successfully synthesized under hydrothermal conditions of Ln(iii) ions with 3,4'-oxybis(benzoate) (3,4'-oba), oxalate (ox) and 1,10-phenanthroline (phen). Structural analyses revealed that they are isostructural 3D open-frameworks with the formula of [Ln(3,4'-oba) (phen)(ox)0.5]n (Ln = Sm for 1, Eu for 2, Gd for 3, Tb for 4, and Dy for 5) and the topology of {33·43·58·6}. Within the 3D structure, the [LnO6N2] units are bridged by ox to form [Ln2ox] dimers and then are further connected by 3,4'-oba ligands...
December 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Rakesh Kr Singh, Sanjay Kumar, Abhay Kr Aman, S M Karim, Sunil Kumar, Manoranjan Kar
BACKGROUND: Tamra Bhasma is derived from metallic copper that is recommended for different ailments of liver and spleen, dropsy, abdominal pain, heart disease, colitis, tumors, anemia, loss of appetite, tuberculosis, as well as eye problems. OBJECTIVES: The knowledge of crystallite size and active ingredients in Bhasma materials is limited restricting its use as nanomedicine in the modern era. Also, the 2015 Nobel prize in medicine has motivated many researchers towards traditional medicines...
December 15, 2017: Journal of Ayurveda and Integrative Medicine
Donald Benza, Unaiza Uzair, Yash Raval, Tzuen-Rong J Tzeng, Caleb J Behrend, Jeffrey N Anker
X-ray excited luminescent chemical imaging (XELCI) uses a combination of X-ray excitation to provide high resolution and optical detection to provide chemical sensing. A key application is to detect and study implant-associated infection. The implant is coated with a layer of X-ray scintillators which generate visible near infrared light when irradiated with an X-ray beam. This light first passes through a pH indicator dye-loaded film placed over the scintillator film in order to modulate the luminescence spectrum according to pH...
January 2017: Proceedings of SPIE
Xiaolong Wang, Xuan Wang, Qingyin Di, Hongli Zhao, Bo Liang, Jingkai Yang
SnO₂ and F doped SnO₂ (FTO) nanoparticles (NPs) have been synthesized by the hydrothermal method with subsequent annealing at 500 °C. The microstructure and photoluminescence (PL) property of SnO₂ and FTO NPs have been investigated, and an assumption model about the luminescence process of FTO NPs has been proposed. All of the SnO₂ and FTO NPs possess polycrystalline tetragonal rutile structures, and the average size in the range of 16.5-20.2 nm decreases with the increasing of F doping content. The doping element F is shown a uniformly distribution by electron energy loss spectroscopy (EELS) mapping...
December 7, 2017: Materials
Ling Ding, Le-Hui Liu, Qing Shi, Yan-Qiong Sun, Yong-Jiang Wang, Yi-Ping Chen
Four novel three-dimensional (3D) 4d-4f heterometal-organic compounds, [LnCd2(Pbc)4(Meimdc)(H2O)]·3H2O (Ln = Eu, 1a; Tb, 1b; Sm, 1c; Dy, 1d) (HPbc = 4-(4-pyridinyl)benzoic acid; H3Meimdc = 2-methyl-1H-4,5-imidazole-dicarboxylic acid), have been successfully prepared by a hydrothermal method. All the compounds are isostructural and show three-dimensional microporous pillar-layered structures with uncoordinated carboxylate sites hung in the channels. Compound 1a possesses excellent chemical stability. The luminescent investigations show that compounds 1a, 1b, 1c, and 1d display the characteristic emission bands of Ln3+ ions...
December 4, 2017: Inorganic Chemistry
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"