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https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#1
Kathryn A O'Hara, David P Ostrowski, Unsal Koldemir, Christopher J Takacs, Sean E Shaheen, Alan Sellinger, Michael L Chabinyc
Many high efficiency organic photovoltaics use fullerene-based acceptors despite their high production cost, weak optical absorption in the visible range, and limited synthetic variability of electronic and optical properties. To circumvent this deficiency, non-fullerene small-molecule acceptors have been developed that have good synthetic flexibility, allowing for precise tuning of optoelectronic properties, leading to enhanced absorption of the solar spectrum and increased open-circuit voltages (VOC). We examined the detailed morphology of bulk heterojunctions of poly(3-hexylthiophene) and the small-molecule acceptor HPI-BT to reveal structural changes that lead to improvements in the fill factor of solar cells upon thermal annealing...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530392/a-hexafluoroquinoxaline-based-polymer-for-nonfullerene-solar-cells-reaching-9-4-efficiency
#2
Shutao Xu, Liuliu Feng, Jun Yuan, Zhi-Guo Zhang, Yongfang Li, Hongjian Peng, Yingping Zou
hrough introducing six fluorine atoms onto quinoxaline (Qx), a new electron acceptor unit-hexafluoroquinoxaline (HFQx) is firstly synthesized. Based on this unit, we synthesize a new donor-acceptor (D-A) copolymer (HFQx-T), which is composed of benzodithiophene (BDT) derivative donor block and an HFQx accepting block. The strong electron-withdrawing properties of fluorine atoms increase significantly the voltage open-circuit (Voc) by tuning the highest occupied molecular orbital (HOMO) energy level. In addition, fluorine atoms enhance the absorption coefficient of the conjugated copolymer and change the film morphology, which implies an increase of the short-circuit current density (Jsc) and fill factor (FF)...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530386/controllable-growth-of-ga-film-electrodeposited-from-aqueous-solution-and-cu-in-ga-se2-solar-cells
#3
Jinlian Bi, Jianping Ao, Qing Gao, Zhaojing Zhang, Guozhong Sun, Qing He, Zhiqiang Zhou, Yun Sun, Yi Zhang
Electrodepositon of Ga film is very challenging due to the high standard reduction potential (-0.53 V vs. SHE for Ga3+). In this study, Ga film with compact structure was successfully deposited on Mo/Cu/In substrate by PCE method using GaCl3 aqueous solution. High deposition rate of Ga3+ and H+ can be achieved by applying large overpotential induced by high pulse current. In the meanwhile, the concentration polarization induced by cations depletion can be minimized by changing the pulse frequency and duty-cycle...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28525576/profiling-of-volatile-organic-compounds-produced-by-clinical-aspergillus-isolates-using-gas-chromatography-mass-spectrometry
#4
M G Gerritsen, P Brinkman, N Escobar, L D Bos, K de Heer, M Meijer, H-G Janssen, H de Cock, H A B Wösten, C E Visser, M H J van Oers, P J Sterk
Volatile organic compounds (VOCs) in exhaled breath may identify the presence of invasive pulmonary aspergillosis. We aimed to detect VOC profiles emitted by in vitro cultured, clinical Aspergillus isolates using gas chromatography-mass spectrometry (GC-MS). Three clinical Aspergillus isolates and a reference strain were cultured while conidiation was prevented. Headspace samples were analyzed using a standardized method. Breath samples of patients from which the cultures were obtained were checked for the presence of the VOCs found in vitro...
May 18, 2017: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/28524743/nanoparticle-exposures-from-nano-enabled-toner-based-printing-equipment-and-human-health-state-of-science-and-future-research-needs
#5
Sandra Vanessa Pirela, John Martin, Dhimiter Bello, Philip Demokritou
Toner formulations used by laser printers (LP) and photocopiers (PC), collectively called "toner-based printing equipment" (TPE), are nano-enabled products (NEP) because they contain several engineered nanomaterials (ENM) that improve toner performance. It has been shown that during consumer use (printing), these ENM are released in the air, together with other semi-volatile organic nanoparticles, and newly formed gaseous co-pollutants such as volatile organic compounds (VOC). The aim of this review is to detail and analyze physico-chemical and morphological (PCM), as well as the toxicological properties of particulate matter (PM) emissions from TPE...
May 19, 2017: Critical Reviews in Toxicology
https://www.readbyqxmd.com/read/28518086/ptr-tof-ms-coupled-with-an-automated-sampling-system-and-tailored-data-analysis-for-food-studies-bioprocess-monitoring-screening-and-nose-space-analysis
#6
Vittorio Capozzi, Sine Yener, Iuliia Khomenko, Brian Farneti, Luca Cappellin, Flavia Gasperi, Matteo Scampicchio, Franco Biasioli
Proton Transfer Reaction (PTR), combined with a Time-of-Flight (ToF) Mass Spectrometer (MS) is an analytical approach based on chemical ionization that belongs to the Direct-Injection Mass Spectrometric (DIMS) technologies. These techniques allow the rapid determination of volatile organic compounds (VOCs), assuring high sensitivity and accuracy. In general, PTR-MS requires neither sample preparation nor sample destruction, allowing real time and non-invasive analysis of samples. PTR-MS are exploited in many fields, from environmental and atmospheric chemistry to medical and biological sciences...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28514136/highly-selective-voc-breath-analysis-using-a-broadly-tunable-vecsel
#7
Béla Tuzson, Jana Jágerská, Herbert Looser, Manuel Graf, Ferdinand Felder, Matthias Fill, Luc Tappy, Lukas Emmenegger
A broadly tunable mid-infrared VECSEL is employed in a direct absorption laser spectroscopic setup to measure acetone in breath-like gas matrix. The large wavelength coverage of more than 30 cm(-1) at 3.38 µm allows, besides acetone, the simultaneous measurement of isoprene, ethanol, methanol, methane, and water. Despite the severe spectral interferences from water and alcohols, an unambiguous determination of acetone is realized with a precision of 13 ppbv that is routinely achieved after 5 minutes averaging at typical breath mean acetone levels without any sample preparation...
May 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28513175/effect-of-voc-emissions-from-vegetation-on-air-quality-in-berlin-during-a-heatwave
#8
Galina Churkina, Friderike Kuik, Boris Bonn, Axel Lauer, Rüdiger Grote, Karolina Tomiak, Tim M Butler
The potential of emissions from urban vegetation combined with anthropogenic emissions to produce ozone and particulate matter has long been recognized. This potential increases with rising temperatures and may lead to severe problems with air quality in densely populated areas during heat waves. Here, we investigate how heat waves affect emissions of volatile organic compounds from urban/suburban vegetation and corresponding ground-level ozone and particulate matter. We use the Weather Research and Forecasting Model with atmospheric chemistry (WRF-Chem) with emissions of volatile organic compounds (VOCs) from vegetation simulated with MEGAN to quantify some of these feedbacks in Berlin, Germany, during the heat wave in 2006...
May 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28512557/increased-vasoocclusive-crises-in-o-blood-group-sickle-cell-disease-patients-association-with-underlying-thrombospondin-levels
#9
M Al Huneini, S Alkindi, V Panjwani, K Al Falahi, B Al Balushi, D Gravell, C H Ho, R Krishnamoorthy, A V Pathare
OBJECTIVES: To explore the incidence of vaso-occlusive crisis (VOC) in Blood Group "O" sickle cell disease (SCD) patients, and correlate it with the blood group and thrombospondin (TSP) levels. METHODS: In 89 consecutive SCD patients, blood samples were obtained for von Williebrand factor (vWF:Ag) antigen, collagen binding activity (CBA), ristocetin binding activity (RCo), blood group typing, C-reactive protein (CRP), high performance liquid chromatography (HPLC), Serum TSP 1 and TSP 2 levels, complete blood counts (CBC), lactic dehydrogenase (LDH) levels, liver function (LFT) and renal function tests (RFT) during VOC episodes and in steady state conditions...
2017: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/28512342/a-gas-sensor-array-for-the-simultaneous-detection-of-multiple-vocs
#10
Yumin Zhang, Jianhong Zhao, Tengfei Du, Zhongqi Zhu, Jin Zhang, Qingju Liu
Air quality around the globe is declining and public health is seriously threatened by indoor air pollution. Typically, indoor air pollutants are composed of a series of volatile organic compounds (VOCs) that are generally harmful to the human body, especially VOCs with low molecular weights (less than 100 Da). Moreover, in some situations, more than one type of VOC is present; thus, a device that can detect one or more VOCs simultaneously would be most beneficial. Here, we synthesized a sensor array with 4 units to detect 4 VOCs: acetone (unit 1), benzene (unit 2), methanol (unit 3) and formaldehyde (unit 4) simultaneously...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28511389/variability-of-iron-load-in-patients-of-sickle-cell-anaemia-hbss-a-study-from-eastern-india
#11
Pranati Mohanty, Rabindra Kumar Jena, Sudha Sethy
INTRODUCTION: Sickle Cell Anaemia (SCA) is one of the commonest haemoglobinopathies due to a point mutation (A→T) of the β-globin gene. Out of five haplotypes, the Arab-Indian haplotype present in India is one of the least severe phenotype and least studied also. It is characterized by lifelong haemolytic anaemia requiring red cell transfusion leading to iron overload. In contrast, there is very high incidence of deficiency of iron, folic acid and vitamin B12. AIM: Our objective was to access the Iron status of SCA patients and to find its correlation with various parameters like red cell transfusion, haemolysis and serum hepcidin...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28508912/pyrazine-fused-isoindigo-a-new-building-block-for-polymer-solar-cells-with-high-open-circuit-voltage
#12
Jiu-Long Li, Yun-Fei Chai, Wei Vanessa Wang, Zi-Fa Shi, Zhu-Guo Xu, Hao-Li Zhang
Pyrazine-fused isoindigo (PzIIG) was designed and synthesized as a novel electron acceptor to construct two D-A conjugated polymers, PzIIG-BDT2TC8 and PzIIG-BTT2TC10. Both the polymers were successfully applied in polymer solar cells, and the PzIIG-BDT2TC8 based solar cell device exhibited a PCE of 5.26% with a high Voc over 1.0 V.
May 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28508885/first-characterisation-of-volatile-organic-compounds-emitted-by-banana-plants
#13
Chadi Berhal, Caroline De Clerck, Marie-Laure Fauconnier, Carolina Levicek, Antoine Boullis, Amine Kaddes, Haïssam M Jijakli, François Verheggen, Sébastien Massart
Banana (Musa sp.) ranks fourth in term of worldwide fruit production, and has economical and nutritional key values. The Cavendish cultivars correspond to more than 90% of the production of dessert banana while cooking cultivars are widely consumed locally around the banana belt production area. Many plants, if not all, produce Volatile Organic Compounds (VOCs) as a means of communication with their environment. Although flower and fruit VOCs have been studied for banana, the VOCs produced by the plant have never been identified despite their importance in plant health and development...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28507663/molecular-engineering-and-sequential-cosensitization-for-preventing-the-trade-off-effect-with-photovoltaic-enhancement
#14
Weiwei Zhang, Yongzhen Wu, Xin Li, Erpeng Li, Xiongrong Song, Huiyun Jiang, Chao Shen, Hao Zhang, He Tian, Wei-Hong Zhu
In dye-sensitized solar cells (DSSCs), it is essential to use rational molecular design to obtain promising photosensitizers with well-matched energy levels and narrow optical band gaps. However, the "trade-off" effect between the photocurrent and photovoltage is still a challenge. Here we report four benzoxidazole based D-A-π-A metal-free organic dyes (WS-66, WS-67, WS-68 and WS-69) with different combinations of π-spacer units and anchoring-acceptor groups. Either extending the π-spacer or enhancing the electron acceptor can efficiently modulate the molecular energy levels, leading to a red-shift in the absorption spectra...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28507202/determination-of-volatile-organic-compounds-exhaled-by-cell-lines-derived-from-hematological-malignancies
#15
Hongxia Tang, Yan Lu, Lulu Zhang, Zhonghui Wu, Xiaofang Hou, Hailong Xia
Background: The gas human exhaled contains many volatile organic compounds (VOCs), which is related to the health status of body. Analysis of VOCs has been proposed as a noninvasive diagnostic tool for certain cancers. Detailed research on the VOCs in gas exhaled by cell can characterize cell type specific metabolites and may be helpful to detect the cancer markers in clinical practice. Methods: Solid phase microextraction-gas chromatography-mass spectrometry was used to detect VOCs in the headspace of tissue culture flask in non-Hodgkin's lymphoma cell line JEKO and acute mononuclear leukemia cell line SHI-1, to elaborate the characteristic gaseous biomarkers of hematological malignancies...
May 15, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28503065/serum-cytokine-levels-related-to-exposure-to-volatile-organic-compounds-and-pm2-5-in-dwellings-and-workplaces-in-french-farmers-a-mechanism-to-explain-nonsmoking-copd
#16
Christelle Audi, Nour Baïz, Cara N Maesano, Ollivier Ramousse, Damien Reboulleau, Antoine Magnan, Denis Caillaud, Isabella Annesi-Maesano
Although French farmers smoke less on average than individuals from the general population, they suffer more from COPD. Exposure to biological and chemical air pollutants in the farm may be the cause of these higher COPD rates. This study investigates the role of bio-contaminants, including the relationship of exposure to volatile organic compounds (VOCs) and fine particulate matter (of diameter of 2.5 µm [PM2.5]) objectively measured in the farm settings (dwellings and workplaces) to serum cytokines involved in COPD, in a sample of 72 farmers from 50 farms in the Auvergne region, France...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28501677/modeling-variability-in-air-pollution-related-health-damages-from-individual-airport-emissions
#17
Stefani L Penn, Scott T Boone, Brian C Harvey, Wendy Heiger-Bernays, Yorghos Tripodis, Sarav Arunachalam, Jonathan I Levy
In this study, we modeled concentrations of fine particulate matter (PM2.5) and ozone (O3) attributable to precursor emissions from individual airports in the United States, developing airport-specific health damage functions (deaths per 1000t of precursor emissions) and physically-interpretable regression models to explain variability in these functions. We applied the Community Multiscale Air Quality model using the Decoupled Direct Method to isolate PM2.5- or O3-related contributions from precursor pollutants emitted by 66 individual airports...
May 11, 2017: Environmental Research
https://www.readbyqxmd.com/read/28500682/red-blood-cell-transfusions-during-sickle-cell-anemia-vaso-occlusive-crises-a-report-from-the-magnesium-in-crisis-magic-study
#18
Monica L Hulbert, Julie A Panepinto, J Paul Scott, Robert I Liem, Lawrence J Cook, Timothy Simmons, David C Brousseau
BACKGROUND: Little is known about red blood cell (RBC) transfusion practices for children hospitalized for a sickle cell vaso-occlusive pain crisis (VOC). We hypothesized that transfusion would be associated with the development of acute chest syndrome (ACS), lower hemoglobin (Hb) concentration, and lack of hydroxyurea therapy. STUDY DESIGN AND METHODS: This is a secondary analysis of all children admitted for a sickle cell pain crisis enrolled in the Magnesium in Crisis (MAGiC) randomized trial; all had HbSS or S-β(0) thalassemia...
May 12, 2017: Transfusion
https://www.readbyqxmd.com/read/28498300/volatile-decay-products-in-breath-during-peritonitis-shock-are-attenuated-by-enteral-blockade-of-pancreatic-digestive-proteases
#19
Frank A DeLano, Jason Chow, Geert W Schmid-Schönbein
There is a need to develop markers for early detection of organ failure in shock that can be non-invasively measured at point of care. We explore here the use of volatile organic compounds (VOCs) in expired air in a rat peritonitis shock model. Expired breath samples were collected into Tedlar gas bags and analyzed by standardized gas chromatography. The gas chromatograms were digitally analyzed for presence of peak amounts over a range of Kovach indices. Following the induction of peritonitis, selected volatile compounds were detected within about one hour, which remained at elevated amounts over a 6 hours observation period...
May 11, 2017: Shock
https://www.readbyqxmd.com/read/28494291/distribution-and-sensorial-relevance-of-volatile-organic-compounds-emitted-throughout-wastewater-biosolids-processing
#20
R M Fisher, N Le-Minh, E C Sivret, J P Alvarez-Gaitan, S J Moore, R M Stuetz
A diverse range of volatile organic compounds (VOCs) are emitted from wastewater biosolids processing. Odorous emissions are predominately made up of volatile sulfur compounds (VSCs) which are typically the only odorants measured. However, a range of VOCs are known to contribute to malodours yet previous studies often overlook the contribution of VOCs in comparison with VSCs. This study aims to evaluate how emissions are affected by different biosolids processing configurations, and if any non-sulfur VOCs should be included in odour measurement and management...
May 8, 2017: Science of the Total Environment
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