keyword
MENU ▼
Read by QxMD icon Read
search

VOC

keyword
https://www.readbyqxmd.com/read/27930834/novel-copolymers-based-tetrafluorobenzene-and-difluorobenzothiadiazole-for-organic-solar-cells-with-prominent-open-circuit-voltage-and-stability
#1
Xunfan Liao, Feiyan Wu, Yongkang An, Qian Xie, Lie Chen, Yiwang Chen
Two novel copolymers based on benzothiadiazole (BT) or difluorobenzothiadizole (ffBT) with 2,2'-(perfluoro-1,4-phenylene)dithiophene (2TPF4), namely PBT-2TPF4 and PffBT-2TPF4, are synthesized for applications in polymer solar cells (PSCs). A noticeably high open-circuit voltage (Voc ) of 1.017 and 0.87 V are achieved for PffBT-2TPF4 and PBT-2TPF4-based devices, respectively. Although only a moderate efficiency (5.7%) of PBT-2TPF4-based devices is obtained, it is first demonstrated that 2TPF4 is a promising acceptor block for construction of the donor copolymers which possess high Voc , prominent crystallinity, and long-term stability, simultaneously...
December 8, 2016: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/27925293/an-all-solution-processed-recombination-layer-with-mild-post-treatment-enabling-efficient-homo-tandem-non-fullerene-organic-solar-cells
#2
Shangshang Chen, Guangye Zhang, Jing Liu, Huatong Yao, Jianquan Zhang, Tingxuan Ma, Zhengke Li, He Yan
The first homo-tandem non-fullerene organic solar cell enabled by a novel recombination layer which only requires a very mild thermal annealing treatment is reported. The best efficiency achieved is 10.8% with a Voc over 2.1 V, which is the highest Voc for double-junction organic solar cells reported to date.
December 7, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27924400/an-insight-into-the-secondary-metabolism-of-muscodor-yucatanensis-small-molecule-epigenetic-modifiers-induce-expression-of-secondary-metabolism-related-genes-and-production-of-new-metabolites-in-the-endophyte
#3
Masroor Qadri, Yedukondalu Nalli, Shreyans K Jain, Asha Chaubey, Asif Ali, Gary A Strobel, Ram A Vishwakarma, Syed Riyaz-Ul-Hassan
Muscodor spp. are proficient producers of bioactive volatile organic compounds (VOCs) with many potential applications. However, all members of this genus produce varying amounts and types of VOCs which suggests the involvement of epigenetics as a possible explanation. The members of this genus are poorly explored for the production of soluble compounds (extrolites). In this study, the polyketide synthase (PKS) and non-ribosomal peptide synthetase (NRPS) genes from an endophyte, Muscodor yucatanensis Ni30, were cloned and sequenced...
December 6, 2016: Microbial Ecology
https://www.readbyqxmd.com/read/27924339/electrosprayed-tio2-nanoporous-hemispheres-for-enhanced-electron-transport-and-device-performance-of-formamidinium-based-perovskite-solar-cells
#4
Tao Ye, Shaoyang Ma, Xi Jiang, Miloš Petrović, Chellappan Vijila, Seeram Ramakrishna, Lei Wei
Titanium dioxide (TiO2) nanoporous hemispheres (NHSs) with a radius of ∼200 nm are fabricated by electrospraying a hydrothermally synthesized TiO2 nanoparticle (NP) suspension solution. The resulting TiO2 NHSs are highly porous, which are beneficial to the infiltration of perovskites and provide a larger contact area, as building blocks to construct a mesoporous TiO2 layer for FA0.81MA0.15Pb(I0.836Br0.15)3 based perovskite solar cells (PSCs). By varying the TiO2 NHS collecting period (15 s, 30 s, 60 s and 90 s) during the electrospraying process, the performance of PSCs changes with different TiO2 NHS distribution densities...
December 7, 2016: Nanoscale
https://www.readbyqxmd.com/read/27919530/sources-of-formaldehyde-and-their-contributions-to-photochemical-o3-formation-at-an-urban-site-in-the-pearl-river-delta-southern-china
#5
Z H Ling, J Zhao, S J Fan, X M Wang
Two models (the Positive Matrix Factorization (PMF) model and a photochemical box model with Master Chemical Mechanism (PBM-MCM)) were applied to analyze the formaldehyde (HCHO) data collected in July 2006 at an urban site (GPEMC) in the Pearl River Delta (PRD), southern China. Three major HCHO sources (secondary formation, vehicular exhaust, and solvent usage) were identified and they were found to contribute in average 53%, 31% and 16% respectively to the total HCHO loading at GPEMC. Alkenes was the most important group contributing to the secondary formation of HCHO, followed by aromatics and alkanes...
December 2, 2016: Chemosphere
https://www.readbyqxmd.com/read/27918484/a-novel-wireless-wearable-volatile-organic-compound-voc-monitoring-device-with-disposable-sensors
#6
Yue Deng, Cheng Chen, Xiaojun Xian, Francis Tsow, Gaurav Verma, Rob McConnell, Scott Fruin, Nongjian Tao, Erica S Forzani
A novel portable wireless volatile organic compound (VOC) monitoring device with disposable sensors is presented. The device is miniaturized, light, easy-to-use, and cost-effective. Different field tests have been carried out to identify the operational, analytical, and functional performance of the device and its sensors. The device was compared to a commercial photo-ionization detector, gas chromatography-mass spectrometry, and carbon monoxide detector. In addition, environmental operational conditions, such as barometric change, temperature change and wind conditions were also tested to evaluate the device performance...
December 3, 2016: Sensors
https://www.readbyqxmd.com/read/27918107/achieving-high-performance-ternary-organic-solar-cells-through-tuning-acceptor-alloy
#7
Yusheng Chen, Pan Ye, Zhen-Gang Zhu, Xinlong Wang, Lei Yang, Xiaozhou Xu, Xiaoxi Wu, Tao Dong, Hao Zhang, Jianhui Hou, Feng Liu, Hui Huang
Acceptor alloys based on n-type small molecular and fullerene derivatives are used to fabricate the ternary solar cell. The highest performance of optimized ternary device is 10.4%, which is the highest efficiency for one donor/two acceptors-based ternary systems. Three important parameters, JSC , VOC , and FF, of the optimized ternary device are all higher than the binary reference devices.
December 5, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27917180/role-of-the-gacs-sensor-kinase-in-the-regulation-of-volatile-production-by-plant-growth-promoting-pseudomonas-fluorescens-sbw25
#8
Xu Cheng, Viviane Cordovez, Desalegn W Etalo, Menno van der Voort, Jos M Raaijmakers
In plant-associated Pseudomonas species, the production of several secondary metabolites and exoenzymes is regulated by the GacS/GacA two-component regulatory system (the Gac-system). Here, we investigated if a mutation in the GacS sensor kinase affects the production of volatile organic compounds (VOCs) in P. fluorescens SBW25 (Pf.SBW25) and how this impacts on VOCs-mediated growth promotion and induced systemic resistance of Arabidopsis and tobacco. A total of 205 VOCs were detected by Gas Chromatography Mass Spectrometry for Pf...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27914329/facile-synthesis-of-go-sno2-tio2-nanofibers-and-their-behavior-in-photovoltaics
#9
Ibrahim M A Mohamed, Van-Duong Dao, Ahmed S Yasin, Ho-Suk Choi, KhalilAbdelrazek Khalil, Nasser A M Barakat
Chemical doping is a widely-used strategy to improve the performance of TiO2 for the dye-sensitized solar cells (DSCs). However, the effect of two efficient dopants has been rarely investigated. We present the synthesis of GO@SnO2/TiO2 nanofibers (NFs) by a facile method using electrospinning and hydrothermal processes. The synthesized NFs are described in terms of morphology, crystallinity and chemistry through FESEM, TEM, HR-TEM, XRD, EDX, XPS, FT-IR and Raman spectra. As the results, the axial ratio and the average diameter of NFs decreased after the hydrothermal treatment and calcination process, respectively...
November 12, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27911440/the-prey-s-scent-volatile-organic-compound-mediated-interactions-between-soil-bacteria-and-their-protist-predators
#10
Kristin Schulz-Bohm, Stefan Geisen, E R Jasper Wubs, Chunxu Song, Wietse de Boer, Paolina Garbeva
Protists are major predators of bacteria in soils. However, it remains unknown how protists sense their prey in this highly complex environment. Here, we investigated whether volatile organic compounds (VOCs) of six phylogenetic distinct soil bacteria affect the performance of three different soil protists and how that relates to direct feeding interactions. We observed that most bacteria affected protist activity by VOCs. However, the response of protists to the VOCs was strongly dependent on both the bacterial and protist interacting partner...
December 2, 2016: ISME Journal
https://www.readbyqxmd.com/read/27909432/volatile-mediated-effects-predominate-in-paraburkholderia-phytofirmans-growth-promotion-and-salt-stress-tolerance-of-arabidopsis-thaliana
#11
Thomas Ledger, Sandy Rojas, Tania Timmermann, Ignacio Pinedo, María J Poupin, Tatiana Garrido, Pablo Richter, Javier Tamayo, Raúl Donoso
Abiotic stress has a growing impact on plant growth and agricultural activity worldwide. Specific plant growth promoting rhizobacteria have been reported to stimulate growth and tolerance to abiotic stress in plants, and molecular mechanisms like phytohormone synthesis and 1-aminocyclopropane-1-carboxylate deamination are usual candidates proposed to mediate these bacterial effects. Paraburkholderia phytofirmans PsJN is able to promote growth of several plant hosts, and improve their tolerance to chilling, drought and salinity...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27905825/saliva-volatile-biomarkers-and-profiles
#12
Maciej Milanowski, Paweł Pomastowski, Tomasz Ligor, Bogusław Buszewski
Saliva is an aqueous fluid found in the oral cavity playing fundamental role in the preservation and maintenance of oral health. Apart from higher-molecular-weight constituents it contains volatile organic compounds (VOCs) that may origin from such sources as blood or be result of bacterial metabolism. They can also reach the oral fluid through dissolving of volatiles from breath and consumed foods. Some of them may serve as biomarkers of various diseases, such as dimethyl disulfide (halitosis), pyridine (periodontal disease) and trimethylamine (trimethylaminuria) or occupational exposure...
December 1, 2016: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/27905399/cellular-reactions-to-long-term-volatile-organic-compound-voc-exposures
#13
Johanna M Gostner, Johannes Zeisler, Mohammad Tauqeer Alam, Peter Gruber, Dietmar Fuchs, Kathrin Becker, Kerstin Neubert, Markus Kleinhappl, Stefan Martini, Florian Überall
Investigations of cellular processes initiated by volatile organic compounds (VOCs) are limited when modelling realistic long-term exposure scenarios at low concentrations. Exposure to indoor VOCs is associated with a range of adverse effects, but data on molecular changes at regulatory threshold limits are lacking. Activity analysis of VOC in vitro can be a valuable complement to inhalation toxicological evaluations. We developed an exposure platform that generates a stable VOC atmosphere and allows the exposure of cells for longer periods...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27902490/detection-of-staphylococcus-aureus-in-cystic-fibrosis-patients-using-breath-voc-profiles
#14
A H Neerincx, B P Geurts, J van Loon, V Tiemes, J J Jansen, F J M Harren, L A J Kluijtmans, P J F M Merkus, S M Cristescu, L M C Buydens, R A Wevers
Staphylococcus aureus (S. aureus) is a common bacterium infecting children with cystic fibrosis (CF). Since current detection methods are difficult to perform in children, there is need for an alternative. This proof of concept study investigates whether breath profiles can discriminate between S. aureus infected and non-infected CF patients based on volatile organic compounds (VOCs). We collected exhaled breath of CF patients with and without S. aureus airways infections in which VOCs were identified using gas chromatography-mass spectrometry...
November 30, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27897390/bis-phenothiazyl-ethynylene-based-organic-dyes-containing-dianchoring-groups-with-efficiency-comparable-to-n719-for-dye-sensitized-solar-cells
#15
Chi-Ho Siu, Lawrence Tien Lin Lee, Po-Yu Ho, Cheuk-Lam Ho, Tao Chen, Songwut Suramitr, Supa Hannongbua, Zhiyuan Xie, Mingdeng Wei, Wai-Yeung Wong
A new series of acetylene-bridged phenothiazine-based dianchoring dyes have been synthesized and fully characterized, and used as the photoactive layer for the fabrication of conventional dye-sensitized solar cells (DSSCs). Tuning of their photophysical and electrochemical properties using different π-conjugated aromatic rings as the central bridge has been demonstrated. This molecular design strategy successfully inhibits the undesirable charge recombination and prolongs the electron lifetime significantly to improve the power conversion efficiency (η), which were proven by the detailed studies of electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD)...
November 29, 2016: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/27896356/vapochromic-features-of-new-luminogens-based-on-julolidine-containing-styrene-copolymers
#16
Giuseppe Iasilli, Fabio Martini, Pierpaolo Minei, Giacomo Ruggeri, Andrea Pucci
We report on vapochromic films suitable for detecting volatile organic compounds (VOCs), based on new polystyrene copolymers containing julolidine fluorescent molecular rotors (JCAEM). Poly(styrene-co-hydroxyethylmethacrylate) copolymers functionalized with cyanovinyl-julolidine moieties of different compositions were prepared, (P(STY-co-JCAEM)(m) with m = 0.06-0.61). The sensing performance of the spin-coated copolymer films demonstrated significant vapochromism when exposed to VOCs characterized by high vapour pressure and a favourable interaction with the polymer matrix, such as Et2O and CH2Cl2...
November 29, 2016: Faraday Discussions
https://www.readbyqxmd.com/read/27886068/effects-of-sampling-conditions-and-environmental-factors-on-fecal-volatile-organic-compound-analysis-by-an-electronic-nose-device
#17
Daniel J C Berkhout, Marc A Benninga, Ruby M van Stein, Paul Brinkman, Hendrik J Niemarkt, Nanne K H de Boer, Tim G J de Meij
Prior to implementation of volatile organic compound (VOC) analysis in clinical practice, substantial challenges, including methodological, biological and analytical difficulties are faced. The aim of this study was to evaluate the influence of several sampling conditions and environmental factors on fecal VOC profiles, analyzed by an electronic nose (eNose). Effects of fecal sample mass, water content, duration of storage at room temperature, fecal sample temperature, number of freeze-thaw cycles and effect of sampling method (rectal swabs vs...
November 23, 2016: Sensors
https://www.readbyqxmd.com/read/27875502/sniffing-out-paediatric-gastrointestinal-diseases-the-potential-of-volatile-organic-compounds-as-biomarkers-for-disease
#18
Martin Buijck, Daniel J C Berkhout, Evelien F J de Groot, Marc A Benninga, Marc P C van der Schee, Corneille Marie Frank Kneepkens, Nanne K H de Boer, Tim G J de Meij
The diagnostic work-up and follow-up of paediatric functional gastrointestinal disorders and organic conditions usually includes invasive tests, carrying a high burden on patients. There is a place, therefore, for novel, noninvasive disease-specific biomarkers. Volatile organic compounds (VOCs), originating from (patho)physiological metabolic processes in the human body, are excreted as waste products through all conceivable bodily excrements. The spectrum of VOCs harbours a magnificent source of information, with the potential to serve as noninvasive diagnostic biomarkers and to monitor disease activity...
December 2016: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/27874211/characteristics-of-volatile-organic-compounds-produced-from-five-pathogenic-bacteria-by-headspace-solid-phase-micro-extraction-gas-chromatography-mass-spectrometry
#19
Juan Chen, Junni Tang, Hui Shi, Cheng Tang, Rong Zhang
The characteristics of volatile compounds from five different bacterial species, Escherichia coli O157:H7, Salmonella Enteritidis, Shigella flexneri, Staphylococcus aureus, and Listeria monocytogenes, growing, respectively, in trypticase soy broth were monitored by headspace solid-phase micro-extraction/gas chromatography-mass spectrometry. The results showed that most volatile organic compounds (VOCs) of five pathogens started to increase after the sixth to tenth hour. Methyl ketones and long chain alcohols were representative volatiles for three Gram-negative bacteria...
November 22, 2016: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/27870983/modulation-of-%C3%AF-spacer-of-carbazole-carbazole-based-organic-dyes-toward-high-efficient-dye-sensitized-solar-cells
#20
Chirawat Chitpakdee, Siriporn Jungsuttiwong, Taweesak Sudyoadsuk, Vinich Promarak, Nawee Kungwan, Supawadee Namuangruk
The effects of type and position of π-linker in carbazole-carbazole based dyes on their performance in dye-sensitized solar cells (DSSCs) were investigated by DFT and TDDFT methods. The calculated electronic energy level, electron density composition, charge injection and charge recombination properties were compared with those of the high performance CCT3A dye synthesized recently. It is found that that mixing a benzothiadizole (B) unit with two thiophene (T) units in the π-spacer can greatly shift absorption wavelength to near infrared region and enhance the light harvesting efficiency (LHE) resulting in increasing of short-circuit current density (Jsc), whereas a thienothiophene unit does not affect those properties...
November 12, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
keyword
keyword
83103
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"