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https://www.readbyqxmd.com/read/28426059/evolution-of-dealloying-induced-strain-in-nanoporous-gold-crystals
#1
Yu-Chen Karen Chen-Wiegart, Ross Harder, David C Dunand, Ian McNulty
We studied the evolution of dealloying-induced strain along the {111} in a Ag-Au nano-crystal in situ, during formation of nanoporous gold at the initial stage of dealloying using Bragg coherent X-ray diffractive imaging. The strain magnitude with maximum probability in the crystal doubled in 10 s of dealloying. Although formation of nano-pores just began at the surface, the greatest strain is located 60-80 nm deep within the crystal. Dealloying induced a compressive strain in this region, indicating volume shrinkage occurred during pore formation...
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
#2
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/28422485/fabrication-of-a-highly-sensitive-single-aligned-tio2-and-gold-nano-particle-embedded-tio2-nano-fiber-gas-sensor
#3
Alireza Nikfarjam, Seyedsina Hosseini, Nahideh Salehifar
In this research, a single-aligned nanofiber of pure TiO2 and Gold nano-particle (GNP)-TiO2 was fabricated using a novel electro-spinning procedure equipped with secondary electrostatic fields on highly sharp triangular and rectangular electrodes provided for gas sensing applications. The Sol used for spinning nanofiber consisted of Titanium Tetraisopropoxide (C12H28O4Ti), Acetic Acid (CH3COOH), Ethanol (C2H5OH) and Polyvinylpyrrolidone (PVP) and gold nanoparticle solution. FE-SEM, TEM, and XRD were used to characterize the single nanofiber...
April 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28420158/intelligent-medical-garments-with-graphene-functionalized-smart-cloth-ecg-sensors
#4
Murat Kaya Yapici, Tamador Elboshra Alkhidir
Biopotential signals are recorded mostly by using sticky, pre-gelled electrodes, which are not ideal for wearable, point-of-care monitoring where the usability of the personalized medical device depends critically on the level of comfort and wearability of the electrodes. We report a fully-wearable medical garment for mobile monitoring of cardiac biopotentials from the wrists or the neck with minimum restriction to regular clothing habits. The wearable prototype is based on elastic bands with graphene functionalized, textile electrodes and battery-powered, low-cost electronics for signal acquisition and wireless transmission...
April 16, 2017: Sensors
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
#5
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/28417536/stretchable-and-soft-electronics-using-liquid-metals
#6
REVIEW
Michael D Dickey
The use of liquid metals based on gallium for soft and stretchable electronics is discussed. This emerging class of electronics is motivated, in part, by the new opportunities that arise from devices that have mechanical properties similar to those encountered in the human experience, such as skin, tissue, textiles, and clothing. These types of electronics (e.g., wearable or implantable electronics, sensors for soft robotics, e-skin) must operate during deformation. Liquid metals are compelling materials for these applications because, in principle, they are infinitely deformable while retaining metallic conductivity...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28415531/new-synthesis-of-poly-ortho-methoxyaniline-nanostructures-and-its-application-to-construct-modified-multi-wall-carbon-nanotube-graphite-paste-electrode-for-simultaneous-determination-of-uric-acid-and-folic-acid
#7
Hossein Rajabi, Meissam Noroozifar
Uric acid (UA) and folic acid (FA) are compounds of biomedical interest. In humans, about 70% of daily uric acid disposal occurs via the kidneys, and in 5-25% of humans, impaired renal (kidney) excretion leads to hyperuricemia. Folate is another form folic acid of which is known as, is one of the B vitamins. It is used as a supplement by women to prevent neural tube defects developing during pregnancy. Polyortho-methoxyaniline nanostructures (POMANS) was synthesized with a new two phase (organic-water) synthesis method...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415529/a-sensitive-voltammetric-detection-of-pramipexole-based-on-1-1-3-3-tetramethyldisilazanecarbon-nanotube-modified-electrode
#8
Saeede Amirighadi, Jahan Bakhsh Raoof, Fereshteh Chekin, Reza Ojani
A simple low-cost method is proposed to fabricate a functionalized multi-wall carbon nanotube (MWCNT) with 1,1,3,3-tetramethyldisilazane (TMDS) molecule. The techniques of scanning electron microscope (SEM) with electron diffraction and energy dispersive X-ray (EDAX) analysis were applied to characterize the functionalized TMDS-MWCNT. The results showed that a MWCNT with high functionalization of TMDS can be obtained using this simple method. A new nanostructure sensor was constructed based on a glassy carbon electrode modified with TMDS-MWCNT (TMDS-MWCNT/GCE)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415523/simultaneous-voltammetric-analysis-of-anti-ulcer-and-d2-antagonist-agents-in-binary-mixture-using-redox-sensor-and-their-determination-in-human-serum
#9
Pakinaz Y Khashaba, Hassan Refat H Ali, Mohamed M El-Wekil
Pencil graphite electrode was successfully modified with a thin film of poly (eriochrome black T) and applied for the sensitive and selective voltammetric simultaneous determination of pantoprazole sodium and domperidone in a binary mixture. The preparation and basic electrochemical behavior of poly (eriochrome black T) film on the Pencil graphite electrode were investigated. The modified electrode has exhibited very high electro-catalytic activity towards the cited mixture. The anodic peaks of the both species were well defined with enhanced oxidation peak currents...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415490/poly-ionic-liquid-functionalized-polypyrrole-nanotubes-supported-gold-nanoparticles-an-efficient-electrochemical-sensor-to-detect-epinephrine
#10
Hui Mao, Haifeng Zhang, Wei Jiang, Jiachen Liang, Ying Sun, Yu Zhang, Qiuhua Wu, Guolin Zhang, Xi-Ming Song
Poly(ionic liquids) (PILs) have been applied as the linkers between Au nanoparticles (NPs) and polypyrrole nanotubes (PPyNTs) for the synthesis of Au/PILs/PPyNTs hybrids. Due to the presence of PILs, high-density and well-dispersed Au NPs have been deposited on the surface of PILs/PPyNTs by anion-exchange with Au precursor and the in-situ reduction of metal ions. The obtained Au/PILs/PPyNTs hybrids can be used as a good steady electrode material for sensitively and selectively detecting epinephrine (EP). The catalytic oxidation peak currents obtained from differential pulse voltammetry (DPV) increased linearly with increasing EP concentrations in the range of 35-960μM with a detection limit of 298...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415478/comparison-of-unusual-carbon-based-working-electrodes-for-electrochemiluminescence-sensors
#11
Muhammad Noman, Alessandro Sanginario, Pravin Jagadale, Danilo Demarchi, Alberto Tagliaferro
In this work, unconventional carbon-based materials were investigated for use in electrochemiluminescence (ECL) working electrodes. Precursors such as bamboo, pistachio shells, kevlar(®) fibers and camphor were differently treated and used as working electrodes in ECL experiments. After a proper process they were assembled as electrodes and tested in an electrochemical cell. Comparison among them and with a commercial glassy carbon electrode (GCE) shows a very good response for all of them thus demonstrating their potential use as disposable low-cost electrodes for early detection electrochemical analysis...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415440/template-electrodeposition-of-high-performance-copper-oxide-nanosensors-for-electrochemical-analysis-of-hydrogen-peroxide
#12
Gajjala Rajendra Kumar Reddy, P Suresh Kumar
We report on the facile electrodeposition of copper nanostructures on graphite lead substrate using anionic, cationic and non-ionic surfactant templates. Physical and electrochemical characterisation confirmed the influence of templates on the morphology and electrochemical catalytic activities of the copper electrodeposits. These electrodes were shown to be excellent electrocatalyst for the fast detection of hydrogen peroxide. A maximum sensitivity of 951.45μA/mM/cm(2), LOD of 0.43μM, response time of <1s and a linearity in wide range of concentration from 1μM to 5mM were observed when sodium dodecyl sulfate was used as the template...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415435/developing-an-electrochemical-sensor-based-on-a-carbon-paste-electrode-modified-with-nano-composite-of-reduced-graphene-oxide-and-cufe2o4-nanoparticles-for-determination-of-hydrogen-peroxide
#13
Ali Benvidi, Mohammad Taghi Nafar, Shahriar Jahanbani, Marzieh Dehghan Tezerjani, Masoud Rezaeinasab, Sudabeh Dalirnasab
In this paper, a highly sensitive voltammetric sensor based on a carbon paste electrode with CuFe2O4 nanoparticle (RGO/CuFe2O4/CPE) was designed for determination of hydrogen peroxide (H2O2). The electrocatalytic reduction of H2O2 was examined using various techniques such as cyclic voltammetry (CV), chronoamperometry, amperometry and differential pulse voltammetry (DPV). CuFe2O4 nanoparticles were synthesized by co-precipitation method and characterized with scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) techniques...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415421/simple-synthesis-of-hierarchical-aupt-alloy-nanochains-for-construction-of-highly-sensitive-hydrazine-and-nitrite-sensors
#14
Ya-Cheng Shi, Jiu-Ju Feng, Sai-Sai Chen, Gao-Mei Tu, Jian-Rong Chen, Ai-Jun Wang
Herein, a single-step co-reduction aqueous route was designed for preparation of hierarchical AuPt alloy nanochains, firstly using amprolium hydrochloride as a new stabilizing agent and structure-director. The morphology, structure, composition, and size of the products were characterized by a series of technique. The growth mechanism of AuPt nanochains was discussed in details. The AuPt nanochains modified glassy carbon electrode showed the improved analytical performances for determination of nitrite and hydrazine...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415401/a-new-2-amino-3-pynanopyrane-3-carbonitrile-derivative-for-electrocatalytic-oxidation-and-determination-of-hydrazine
#15
Leili Shahidi, Masoumeh Taei, Seyed Hossein Banitaba, Nahid Tavakkoli
A noble glassy carbon electrode modified with Au nanoparticles and 2-amino-4-(3,4-dihydroxyphenyl)-6-(hydroxymethyl)-8-oxo-4,8-dihydropyrano[3,2-b]pyran-3-carbonitrile, was fabricated for electrocatalytic determination of hydrazine (AuNPs/APP/GCE). Large over-potential and interference of some species are two limitation factors for the determination of hydrazine at bare electrode. This modified electrode is able to shift a signal to the negative potential, and can amplify the oxidation current of hydrazine by 28...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414950/a-nanobiosensor-composed-of-exfoliated-graphene-oxide-and-gold-nano-urchins-for-detection-of-gmo-products
#16
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/28412845/fetal-and-maternal-temperatures-during-labor-and-delivery-a-prospective-descriptive-study
#17
Tony Lavesson, Karin Källén, Per Olofsson
OBJECTIVE: To study the fetal scalp temperature (FST) and maternal axillary temperature (MAT) during vaginal delivery relative to progression of labor, uterine contractions (UC) and epidural analgesia (EDA), and to construct normal temperature reference ranges related to stage of labor. MATERIAL AND METHODS: Temperatures were recorded continuously in labor of 132 women with a bi-metal temperature sensor attached to the axilla (MAT) and a similar sensor mounted in a scalp electrode (FST)...
April 16, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28412661/reliable-clinical-serum-analysis-with-reusable-electrochemical-sensor-toward-point-of-care-measurement-of-the-antipsychotic-medication-clozapine
#18
Mijeong Kang, Eunkyoung Kim, Thomas E Winkler, George Banis, Yi Liu, Christopher A Kitchen, Deanna L Kelly, Reza Ghodssi, Gregory F Payne
Clozapine is one of the most promising medications for managing schizophrenia but it is under-utilized because of the challenges of maintaining serum levels in a safe therapeutic range (1-3μM). Timely measurement of serum clozapine levels has been identified as a barrier to the broader use of clozapine, which is however challenging due to the complexity of serum samples. We demonstrate a robust and reusable electrochemical sensor with graphene-chitosan composite for rapidly measuring serum levels of clozapine...
April 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28411819/an-electrochemical-bisphenol-a-sensor-based-on-one-step-electrochemical-reduction-of-cuprous-oxide-wrapped-graphene-oxide-nanoparticles-modified-electrode
#19
Rongguang Shi, Jing Liang, Zongshan Zhao, Aifeng Liu, Yong Tian
Bisphenol A (BPA), as an important industrial material, has been widespread concerned in recent years as its endocrine disrupting effect. This study reported a novel bisphenol A sensor via a facile one step electrochemical reduction of graphene oxide (rGO) and cuprous oxide (Cu2O) nanocomposite modified glassy carbon electrodes. The characterization of the fabricated sensor was performed by scanning electron microscopy and X-ray spectroscopy. The prepared Cu2O-rGO electrode presented fast response, high sensitivity and low background current...
July 1, 2017: Talanta
https://www.readbyqxmd.com/read/28409497/identification-of-myoelectric-signals-of-pregnant-rat-uterus-new-method-to-detect-myometrial-contraction
#20
Kálmán F Szűcs, György Grosz, Miklós Süle, Anikó Nagy, Zita Tiszai, Reza Samavati, Róbert Gáspár
AIM: To develop an electromyography method for pregnant rat uterus in vivo and to separate myometrial signals from the gastrointestinal tract signals. METHODS: Pregnant Sprague-Dawley rats (n=8) were anaesthetized and their stomach, small intestine, and large intestine were removed from the abdomen. A pair of thread electrodes was inserted into the uterus, while a pair of disk electrodes was placed subcutaneously above the myometrium. Additionally, a strain gauge sensor was fixed on the surface of the myometrium and cecum for the parallel detection of mechanical contractions in rats (n=18) with intact gastrointestinal tract...
April 14, 2017: Croatian Medical Journal
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