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https://www.readbyqxmd.com/read/28448043/challenges-in-rheological-characterization-of-highly-concentrated-suspensions-a-case-study-for-screen-printing-silver-pastes
#1
Ceren Yüce, Norbert Willenbacher
A comprehensive rheological characterization of highly concentrated suspensions or pastes is mandatory for a targeted product development meeting the manifold requirements during processing and application of such complex fluids. In this investigation, measuring protocols for a conclusive assessment of different process relevant rheological parameters have been evaluated. This includes the determination of yield stress, viscosity, wall slip velocity, structural recovery after large deformation and elongation at break as well as tensile force during filament stretching...
April 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28440872/lay-health-educators-and-print-materials-for-the-promotion-of-colorectal-cancer-screening-among-korean-americans-a-randomized-comparative-effectiveness-study
#2
Angela M Jo, Tung T Nguyen, Susan Stewart, Min J Sung, Ginny Gildengorin, Janice Y Tsoh, Elisa K Tong, Penny Lo, Charlene Cuaresma, Angela Sy, Hy Lam, Ching Wong, Matthew Jeong, Moon S Chen, Marjorie Kagawa-Singer
BACKGROUND: Colorectal cancer (CRC) is the second most commonly diagnosed cancer among Korean American men and women. Although CRC screening is effective in reducing the burden of this disease, studies have shown that Korean Americans have low screening rates. METHODS: The authors conducted a 2-arm cluster randomized controlled trial comparing a brochure (print) with a brochure and lay health educator (LHE) outreach (print + LHE) in increasing CRC screening rates among Korean American individuals...
April 25, 2017: Cancer
https://www.readbyqxmd.com/read/28439415/stretchable-biofuel-cells-as-wearable-textile-based-self-powered-sensors
#3
Itthipon Jeerapan, Juliane R Sempionatto, Adriana Pavinatto, Jung-Min You, Joseph Wang
Highly stretchable textile-based biofuel cells (BFCs), acting as effective self-powered sensors, have been fabricated using screen-printing of customized stress-enduring inks. Due to synergistic effects of nanomaterial-based engineered inks and the serpentine designs, these printable bioelectronic devices endure severe mechanical deformations, e.g., stretching, indentation, or torsional twisting. Glucose and lactate BFCs with the single enzyme and membrane-free configurations generated the maximum power density of 160 and 250 µW cm(-2) with the open circuit voltages of 0...
December 21, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28433055/pyrenyl-carbon-nanostructures-for-ultrasensitive-measurements-of-formaldehyde-in-urine
#4
Gayan Premaratne, Sabrina Farias, Sadagopan Krishnan
Measurement of ultra-low (e.g., parts-per-billion) levels of small-molecule markers in body fluids (e.g., serum, urine, saliva) involves a considerable challenge in view of designing assay strategies with sensitivity and selectivity. Herein we report for the first time an amperometric nano-bioelectrode design that uniquely combines 1-pyrenebutyric acid units pi-pi stacked with carboxylated multiwalled carbon nanotubes on the surface of gold screen printed electrodes for covalent attachment of NAD(+) dependent formaldehyde dehydrogenase (FDH)...
June 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28430242/thermally-stable-wleds-with-excellent-luminous-properties-by-screen-printing-a-patterned-phosphor-glass-layer-on-a-microstructured-glass-plate
#5
Yang Peng, Xing Guo, Ruixin Li, Hao Cheng, Mingxiang Chen
In order to improve the luminous properties and thermal reliability of white light-emitting diodes (WLEDs), we proposed a promising phosphor-in-glass (PiG) converter, which was prepared by screen-printing a patterned phosphor glass layer on a microstructured glass plate. The patterned layer achieves four-quadrant phosphor geometry based on separated yellow Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sup>3+</sup> (YAG:Ce<sup>3+</sup>) and red CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> (CASN:Eu<sup>2+</sup>) phosphor parts...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28426040/enhancement-of-the-hole-conducting-effect-of-nio-by-a-n2-blow-drying-method-in-printable-perovskite-solar-cells-with-low-temperature-carbon-as-the-counter-electrode
#6
T A Nirmal Peiris, Ajay K Baranwal, Hiroyuki Kanda, Shota Fukumoto, Shusaku Kanaya, Ludmila Cojocaru, Takeru Bessho, Tsutomu Miyasaka, Hiroshi Segawa, Seigo Ito
In this article, we demonstrate for the first time a mesoscopic printable perovskite solar cell (PSC) using NiO as the hole transporting material and low-temperature processed carbon as the counter electrode. A single deposition method assisted by N2 blow drying was used for the deposition of MAPbI3 on a TiO2/ZrO2/NiO screen-printed electrode. As the final step a low-temperature processing (i.e. 75 °C) carbon counter layer was fabricated on MAPbI3 by a blade coating method. It is found that the capping layer thickness of MAPbI3 has a significant effect on the device efficiency, especially when NiO is introduced as a hole transporting material into the structure...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28425441/methyl-parathion-detection-in-vegetables-and-fruits-using-silver-graphene-nanoribbons-nanocomposite-modified-screen-printed-electrode
#7
Mani Govindasamy, Veerappan Mani, Shen-Ming Chen, Tse-Wei Chen, Ashok Kumar Sundramoorthy
We have developed a sensitive electrochemical sensor for Organophosphorus pesticide methyl parathion (MP) using silver particles supported graphene nanoribbons (Ag@GNRs). The Ag@GNRs nanocomposite was prepared through facile wet chemical strategy and characterized by TEM, EDX, XRD, Raman, UV-visible, electrochemical and impedance spectroscopies. The Ag@GNRs film modified screen printed carbon electrode (SPCE) delivers excellent electrocatalytic ability to the reduction of MP. The Ag@GNRs/SPCE detects sub-nanomolar concentrations of MP with excellent selectivity...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28418064/surfactant-exfoliated-2d-hexagonal-boron-nitride-2d-hbn-explored-as-a-potential-electrochemical-sensor-for-dopamine-surfactants-significantly-influence-sensor-capabilities
#8
Aamar F Khan, Dale A C Brownson, Christopher W Foster, Graham C Smith, Craig E Banks
Surfactant exfoliated 2D hexagonal Boron Nitride (2D-hBN) nanosheets are explored as a potential electrochemical sensing platform and evaluated towards the electroanalytical sensing of dopamine (DA) in the presence of the common interferents, ascorbic acid (AA) and uric acid (UA). Surfactant exfoliated 2D-hBN nanosheets (2-4 layers) fabricated using sodium cholate in aqueous media are electrically wired via a drop-casting modification process onto disposable screen-printed graphite electrodes (SPEs). We critically evaluate the performance of these 2D-hBN modified SPEs and demonstrate the effect of 'mass coverage' towards the detection of DA, AA and UA...
April 18, 2017: Analyst
https://www.readbyqxmd.com/read/28414950/a-nanobiosensor-composed-of-exfoliated-graphene-oxide-and-gold-nano-urchins-for-detection-of-gmo-products
#9
Zahra Aghili, Navid Nasirizadeh, Adeleh Divsalar, Shahram Shoeibi, Parichehreh Yaghmaei
Genetically Modified Organisms, have been entered our food chain and detection of these organisms in market products are still the main challenge for scientists. Among several developed detection/quantification methods for detection of these organisms, the electrochemical nanobiosensors are the most attended which are combining the advantages of using nanomaterials, electrochemical methods and biosensors. In this research, a novel and sensitive electrochemical nanobiosensor for detection/quantification of these organisms have been developed using nanomaterials; Exfoliated Graphene Oxide and Gold Nano-Urchins for modification of the screen-printed carbon electrode, and also applying a specific DNA probe as well as hematoxylin for electrochemical indicator...
March 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28398720/immobilization-on-metal-organic-framework-engenders-high-sensitivity-for-enzymatic-electrochemical-detection
#10
Cheng Zhang, Xuerui Wang, Miao Hou, Xiaoyang Li, Xiaoling Wu, Jun Ge
The protection effect of metal-organic framework (MOF) provides high stability for immobilized enzyme. The small cavities of MOFs, however, usually result in decreased apparent substrate affinity and enzymatic activity of immobilized enzyme, compared to native enzyme. We synthesized zeolitic imidazolate framework-8 (ZIF-8) with a combination of mesoporous and microporous channels for cytochrome c (Cyt c) immobilization. Compared with native Cyt c, the immobilized Cyt c displayed increased apparent substrate affinity (Michaelis constant Km reduced by ∼50%), ∼128% increased enzymatic activity, and 1...
April 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28395163/electrochemical-preparation-of-activated-graphene-oxide-for-the-simultaneous-determination-of-hydroquinone-and-catechol
#11
Murugan Velmurugan, Natarajan Karikalan, Shen-Ming Chen, Yi-Hui Cheng, Chelladurai Karuppiah
This paper describes the electrochemical preparation of highly electrochemically active and conductive activated graphene oxide (aGO). Afterwards, the electrochemical properties of aGO was studied towards the simultaneous determination of hydroquinone (HQ) and catechol (CC). This aGO is prepared by the electrochemical activation of GO by various potential treatments. The resultant aGOs are examined by various physical and electrochemical characterizations. The high potential activation (1.4 to -1.5) process results a highly active GO (aGO1), which manifest a good electrochemical behavior towards the determination of HQ and CC...
March 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28394563/unclonable-security-codes-designed-from-multicolor-luminescent-lanthanide-doped-y2o3-nanorods-for-anticounterfeiting
#12
Pawan Kumar, Kanika Nagpal, Bipin Kumar Gupta
The duplicity of important documents has emerged as a serious problem worldwide. Therefore, many efforts have been devoted to developing easy and fast anticounterfeiting techniques with multicolor emission. Herein, we report the synthesis of multicolor luminescent lanthanide-doped Y2O3 nanorods by hydrothermal method and their usability in designing of unclonable security codes for anticounterfeiting applications. The spectroscopic features of nanorods are probed by photoluminescence spectroscopy. The Y2O3:Eu(3+), Y2O3:Tb(3+), and Y2O3:Ce(3+) nanorods emit hypersensitive red (at 611 nm), strong green (at 541 nm), and bright blue (at 438 nm) emissions at 254, 305, and 381 nm, respectively...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28393530/a-new-electrochemical-system-based-on-a-flow-field-shaped-solid-electrode-and-3d-printed-thin-layer-flow-cell-detection-of-pb-2-ions-by-continuous-flow-accumulation-square-wave-anodic-stripping-voltammetry
#13
Qianwen Sun, Jikui Wang, Meihua Tang, Liming Huang, Zhiyi Zhang, Chang Liu, Xiaohua Lu, Kenneth W Hunter, Guosong Chen
Here we describe a new and sensitive flow electrochemical detection system that employs a novel flow-field shaped solid electrode (FFSSE). The system was constructed with a 3D-printed thin-layer flow cell (TLFC) and a flat screen-printed FFSSE with USB connection. This interface facilitates continuous flow accumulation square-wave anodic stripping voltammetry (ASV). The flow distribution in the working space of TLFC was simulated using the finite element method (FEM) and the shape and configuration of electrodes were optimized accordingly...
April 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28391855/determination-of-nickel-ii-by-ion-transfer-to-hydroxide-medium-using-sequential-injection-electrochemical-analysis-sieca
#14
Eakkasit Punrat, Panunporn Tutiyasarn, Suchada Chuanuwatanakul, Orawon Chailapakul
A method for the determination of Ni(II) using ion-transfer to a hydroxide medium has been developed by the sequential injection-electrochemical analysis (SIECA), a combination between an automated flow-based analysis and electrochemical techniques with a homemade screen-printed carbon electrode (SPCE). A sample/standard solution was introduced into an electrochemical flow cell where the Ni(II) in the solution was electrochemically reduced and accumulated on the SPCE. The accumulated Ni was then oxidized to Ni(II) in a hydroxide medium, which led to the formation of nickel hydroxide (Ni(OH)2) and nickel oxyhydroxide (NiOOH) on the SPCE...
June 1, 2017: Talanta
https://www.readbyqxmd.com/read/28387776/enhanced-detection-of-quantum-dots-by-the-magnetohydrodynamic-effect-for-electrochemical-biosensing
#15
Daniel Martín-Yerga, Pablo Fanjul-Bolado, David Hernández-Santos, Agustín Costa-García
In this work, we describe the use of a magnetoelectrochemical support for screen-printed electrodes to improve the anodic stripping voltammetry of cadmium due to the generated magnetohydrodynamic (MHD) effect. To create a significant MHD effect, Fe(iii) was added at mM concentrations to the solution. The reduction of Fe(iii) simultaneously with the cadmium deposition on the electrode surface allowed the production of a high cathodic current, which generated a large Lorentz force capable of exerting a convective effect on the solution in the presence of the magnetic field...
April 7, 2017: Analyst
https://www.readbyqxmd.com/read/28384528/a-new-peroxidase-from-leaves-of-guinea-grass-panicum-maximum-a-potential-biocatalyst-to-build-amperometric-biosensors
#16
Diana A Centeno, Xuxan H Solano, John J Castillo
A new plant peroxidase was isolated from the leaves of guinea grass (Panicum maximum) and partially purified using a biphasic polymer system (poly(ethylene glycol) - ammonium sulfate) followed by size-exclusion chromatography and ultracentrifugation until obtaining a homogeneous extract containing a high peroxidase activity. The novel peroxidase was characterized as having a specific activity of 408U/mg and a molecular weight of 30kDa. The pH for its optimum activity was 8.0 and exhibited a high thermostability at 66°C with a kinact of 8...
March 29, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28382962/performance-stability-and-operation-voltage-optimization-of-screen-printed-aqueous-supercapacitors
#17
Suvi Lehtimäki, Anna Railanmaa, Jari Keskinen, Manu Kujala, Sampo Tuukkanen, Donald Lupo
Harvesting micropower energy from the ambient environment requires an intermediate energy storage, for which printed aqueous supercapacitors are well suited due to their low cost and environmental friendliness. In this work, a systematic study of a large set of devices is used to investigate the effect of process variability and operating voltage on the performance and stability of screen printed aqueous supercapacitors. The current collectors and active layers are printed with graphite and activated carbon inks, respectively, and aqueous NaCl used as the electrolyte...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28379948/materials-science-screen-printing-of-2d-semiconductors
#18
Young Duck Kim, James Hone
No abstract text is available yet for this article.
April 13, 2017: Nature
https://www.readbyqxmd.com/read/28376106/electrochemical-sensor-for-rapid-determination-of-fibroblast-growth-factor-receptor-4-in-raw-cancer-cell-lysates
#19
Rebeca M Torrente-Rodríguez, Víctor Ruiz-Valdepeñas Montiel, Susana Campuzano, María Pedrero, Meryem Farchado, Eva Vargas, F Javier Manuel de Villena, María Garranzo-Asensio, Rodrigo Barderas, José M Pingarrón
The first electrochemical immunosensor for the determination of fibroblast growth factor receptor 4 (FGFR4) biomarker is reported in this work. The biosensor involves a sandwich configuration with covalent immobilization of a specific capture antibody onto activated carboxylic-modified magnetic microcarriers (HOOC-MBs) and amperometric detection at disposable carbon screen-printed electrodes (SPCEs). The biosensor exhibits a great analytical performance regarding selectivity for the target protein and a low LOD of 48...
2017: PloS One
https://www.readbyqxmd.com/read/28364718/determination-of-4-nitrophenol-in-water-by-use-of-a-screen-printed-carbon-electrode-modified-with-chitosan-crafted-zno-nanoneedles
#20
Balamurugan Thirumalraj, Chellakannu Rajkumar, Shen-Ming Chen, Kuan-Yu Lin
The toxicity and environmental pollution by nitro aromatic compounds in water samples is the most recognized problem in worldwide. Hence, we have developed a simple and highly sensitive electrochemical method for the determination of 4-nitrophenol (4-NP) in water samples based on a chitosan (CHT) crafted zinc oxide nanoneedles (ZnO NDs) modified screen printed carbon electrode. The CHT/ZnO NDs were characterized by Field emission scanning electron microscope, Fourier transform infrared spectroscopy and X-ray diffraction technique...
March 23, 2017: Journal of Colloid and Interface Science
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