نتایج جستجو برای: dimethyl methylphosphonate

تعداد نتایج: 26528  

2010
V. M. Bermudez

The adsorption of dimethyl methylphosphonate (DMMP) on the (0 1 0) surface of anatase TiO2, which is isostructural with the (1 0 0), has been studied using density functional theory and two-dimensionallyperiodic slab models. The experimentally-observed faceting of this surface has, for the first time, been included in the modeling. The relaxations of bare surfaces both with and without faceting...

Journal: :Journal of the American Society for Mass Spectrometry 2017
Morphy C Dumlao Dan Xiao Daming Zhang John Fletcher William A Donald

Active capillary dielectric barrier discharge ionization (DBDI) is emerging as a compact, low-cost, and robust method to form intact ions of small molecules for detection in near real time by portable mass spectrometers. Here, we demonstrate that by using a 10 kHz, ~2.5 kVp-p high-voltage square-wave alternating current plasma, active capillary DBDI can consume less than 1 μW of power. In contr...

Journal: :Analytical chemistry 2005
Wes E Steiner Steve J Klopsch William A English Brian H Clowers Herbert H Hill

For the first time, a traditional radioactive nickel (63Ni) beta emission ionization source for ion mobility spectrometry was employed with an atmospheric pressure ion mobility orthogonal reflector time-of-flight mass spectrometer (IM(tof)MS) to detect a chemical warfare agent (CWA) simulant from aerosol samples. Aerosol-phase sampling employed a quartz cyclonic chamber for sample introduction....

Journal: :The journal of physical chemistry. B 2006
Karla A Miller Richard D Yang Michael J Hale Jeongwon Park Bernd Fruhberger Corneliu N Colesniuc Ivan K Schuller Andrew C Kummel William C Trogler

The electrical properties of 50 nm thick metallophthalocyanine films, prepared by organic molecular beam epitaxy (OMBE) on interdigitated electrodes, were studied with DC current-voltage measurements and impedance spectroscopy. The transition from Ohmic behavior at low voltages to space-charge-limited conductivity (SCLC) at higher voltages depends on the metal electrode (Pt, Pd, and Au), but do...

2014
Yi Li Xiaosong Du Yang Wang Huiling Tai Dong Qiu Qinghao Lin Yadong Jiang

To achieve both high speed and separation efficiency in the separation of a mixture of nerve and blister agent simulants, a high-aspect-ratio micro-fabricated multi-capillary column (MCC, a 50-cm-long, 450-μm-deep, and 60-μm-wide four-capillary column) was fabricated by the application of the microelectromechanical system (MEMS) techniques. Mixtures of chemical warfare agent (CWA) simulants - d...

Journal: :Analytical and bioanalytical chemistry 2011
Jennifer L Gottfried

The potential of laser-induced breakdown spectroscopy (LIBS) to discriminate biological and chemical threat simulant residues prepared on multiple substrates and in the presence of interferents has been explored. The simulant samples tested include Bacillus atrophaeus spores, Escherichia coli, MS-2 bacteriophage, α-hemolysin from Staphylococcus aureus, 2-chloroethyl ethyl sulfide, and dimethyl ...

Journal: :Nanotechnology 2011
Liangming Wei Diwen Shi Peiyi Ye Zhenqing Dai Haiyan Chen Changxin Chen Jian Wang Liying Zhang Dong Xu Zi Wang Yafei Zhang

We developed a chemiresistive sensor based on doped and functionalized semiconducting single-walled carbon nanotube (SWNT) networks for ultrasensitive and rapid detection of dimethyl methylphosphonate (DMMP) (simulant of nerve agent sarin) vapor. The semiconducting SWNT network was deposited between interdigitated electrodes and modified by solid organic acid tetrafluorohydroquinone (TFQ). The ...

2016
Yunnan Fang Jimmy G. D. Hester Wenjing Su Justin H. Chow Suresh K. Sitaraman Manos M. Tentzeris

A bio-enabled, environmentally-friendly, and maximally mild layer-by-layer approach has been developed to surface modify inherently hydrophobic Kapton HN substrates to allow for great printability of both water- and organic solvent-based inks thus facilitating the full-inkjet-printing of flexible electronic devices. Different from the traditional Kapton surface modification approaches which are...

2018
Marta Lafuente Erwin J. W. Berenschot Roald M. Tiggelaar Reyes Mallada Niels R. Tas Maria P. Pina

One of the main limitations of the technique surface-enhanced Raman scattering (SERS) for chemical detection relies on the homogeneity, reproducibility and reusability of the substrates. In this work, SERS active platforms based on 3D-fractal microstructures is developed by combining corner lithography and anisotropic wet etching of silicon, to extend the SERS-active area into 3D, with electros...

Journal: :Nucleic acids research 1998
L A Tomky J K Strauss-Soukup L J Maher

Previous electrophoretic experiments suggest that the AP-1 site in duplex DNA bends in response to the pattern of amino acid charges distal to the basic region in bound bZIP proteins. The extent and direction of apparent DNA bending are consistent with the prediction that DNA will collapse locally upon asymmetric phosphate charge neutralization. To prove that asymmetric phosphate neutralization...

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