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BNL--99102-2013-CP
In-situ spectro-microscopy on organic films: Mn-Phthalocyanine on Ag(100)
OSTI ID: 1062635 - Metal phthalocyanines are attracting significant attention, owing to their potential for applications in chemical sensors, solar cells and organic magnets. As the electronic properties of molecular films are determined by their crystallinity and molecular packing, the optimization of film quality is important for improving the performance of organic devices. Here, we present the results of in situ low-energy electron microscopy / photoemission electron microscopy (LEEM/PEEM) studies of incorporation-limited growth [1] of manganese-phthalocyanine (MnPc) on Ag(100) surfaces. MnPc thin films were grown on both, bulk Ag(100) surface and thin Ag(100)/Fe(100) films, where substrate spin-polarized electronic states can be modified through tuning the thickness of the Ag film [2]. We also discuss the electronic structure and magnetic ordering in MnPc thin films, investigated by angle- and spin-resolved photoemission spectroscopy."
Al-Mahboob A.
,
Vescovo, E.
,
Sadowski, J.T.
2013 Aug 18
PNNL-SA-89373
Molecular Characterization of Organic Aerosol Using Nanospray Desorption/Electrospray Ionization Mass Spectrometry: CalNex 2010 field study
OSTI ID: 1063717 - Aerosol samples from the CalNex 2010 field study were analyzed using high resolution mass spectrometry (HR-MS) coupled to a nanospray-desorption/electrospray ionization (nano-DESI) source. The samples were collected in Bakersfield, CA on June 22-23, 2010. The chemical formulas of over 1300 unique molecular species were detected in the mass range of 50-800 m/z. Our analysis focused on identification of two main groups: compounds containing only carbon, hydrogen, and oxygen (CHO only), and nitrogen-containing organic compounds (NOC). The NOC accounted for 35% (by number) of the compounds observed in the afternoon, and for 59% in the early morning samples. By comparing plausible reactant-product pairs, we propose that over 50% of the NOC in each sample could have been formed through reactions transforming carbonyls into imines. The CHO only compounds were dominant in the afternoon suggesting a photochemical source. The average O:C ratios of all observed compounds were fairly consistent throughout the day, ranging from 0.34 in the early morning to 0.37 at night. We conclude that both photooxidation and ammonia chemistry play important roles in forming the compounds observed in this mixed urban-rural environment."
O'Brien, Rachel E.
,
Laskin, Alexander
,
Laskin, Julia
, et.al.
2013 Apr 01
PNNL-SA-92347
Preparation, characterization of Fe3O4 at TiO2 magnetic nanoparticles and their application for immunoassay of biomarker of exposure to organophosphorus pesticides
OSTI ID: 1060116 - Novel Fe3O4 at TiO2 magnetic nanoparticles were prepared and developed for a new nanoparticle-based immunosensor for electrochemical quantification of organophosphorylated butyrylcholinesterase (BChE) in plasma, a specific biomarker of exposure to organophosphorus (OP) agents. The Fe3O4 at TiO2 nanoparticles were synthesized by hydrolysis of tetrabutyltitanate on the surface of Fe3O4 magnetic nanospheres, and characterized by attenuated total reflection Fourier-transform infrared spectra, transmission electron microscope and X-ray diffraction. The functional Fe3O4 at TiO2 nanoparticles were performed as capture antibody to selectively enrich phosphorylated moiety instead of phosphoserine antibody in the traditional sandwich immunoassays. The secondary recognition was served by quantum dots (QDs)-tagged anti-BChE antibody (QDs-anti-BChE). With the help of a magnet, the resulting sandwich-like complex, Fe3O4 at TiO2/OP-BChE/QDs-anti-BChE, was easily isolated from sample solutions and the released cadmium ions were detected on a disposable screen-printed electrode (SPE). The binding affinities were investigated by both surface plasmon resonance (SPR) and square wave voltammetry (SWV). This method not only avoids the drawback of unavailability of commercial OP-specific antibody but also amplifies detection signal by QDs-tags together with easy separation of samples by magnetic forces. The proposed immunosensor yields a linear response over a broad OP-BChE concentrations range from 0.02 to 10 nM, with detection limit of 0.01 nM. Moreover, the disposable nanoparticle-based immunosensor has been validated with human plasma samples. It offers a new method for rapid, sensitive, selective and inexpensive screening/evaluating exposure to OP pesticides."
Zhang, Xiao
,
Wang, Hongbo
,
Yang, Chunming
, et.al.
2013 Mar 15
1 Mb
DE-FG36-05GO15009
Nano Structured Activated Carbon for Hydrogen Storge
OSTI ID: 1063989 - Development of a nanostructured synthetic carbons materials that have been synthesized by thermal-decomposition of aromatic rich polyether such as poly(ether ether ketone) (PEEK) is reported. These polymers based nanostructured carbons efficacious for gas adsorption and storage and have Brunauer-Emmett-Teller (BET) surface area of more than 3000 m2/g, and with average pore diameter of < 2nm. Surface-area, pore characteristics, and other critical variables for selecting porous materials of high gas adsorption capacities are presented. Analysis of the fragments evolved under various carbonization temperatures, and the correlation between the activation and carbonization temperatures provides a mechanistic perspective of the pore evolution during activation. Correlations between gas (N2 and H2) adsorption capacity and porous texture of the materials have been established. The materials possess excellent hydrogen storage properties, with hydrogen storage capacity up to 7.4 wt% (gravimetric) and ~ 45 g H2 L-1 (volumetric) at -196oC and 6.0 MPa."
Israel Cabasso
,
Youxin Yuan
2013 Feb 27
1060051
Controlling factors in tensile deformation of nanocrystalline cobalt and nickel
OSTI ID: 1060051 - Abstract not provided"
Wang, Y.M.
,
Ott, R.T.
,
van Buuren, T.
, et.al.
2013 Feb 27
1064470
Opening and Closing of Nanocavities under Cyclic Loading in a Soft Nanocomposite Probed by Real-Time Small-Angle X-ray Scattering
OSTI ID: 1064470 - Abstract not provided"
Zhang, Huan
,
Scholz, Arthur K.
,
Vion-Loisel, Fabien
, et.al.
2013 Feb 25
1064461
Self-Assembled DNA Crystals: The Impact on Resolution of 5;#8242;-Phosphates and the DNA Source
OSTI ID: 1064461 - Abstract not provided"
Sha, Ruojie
,
Birktoft, Jens J.
,
Nguyen, Nam
, et.al.
2013 Feb 22
LA-UR-13-21171
Density Functional Study of the Structure, Stability and Oxygen Reduction Activity of Ultrathin Platinum Nanowires
OSTI ID: 1063919 - Abstract Not Provided"
Gonzales, Ivana
,
Henson, Neil J.
,
Garzon, Fernando H.
2013 Feb 20
LA-UR-13-21028
"Giant" nanocrystal quantum dots for light-emission applications
OSTI ID: 1063241 - Abstract Not Provided"
Hollingsworth, Jennifer A.
2013 Feb 15
1059529
Molecular Crystallization Controlled by pH Regulates Mesoscopic Membrane Morphology
OSTI ID: 1059529 - Abstract not provided"
Leung, Cheuk-Yui
,
Palmer, Liam C.
,
Qiao, Bao Fu
, et.al.
2013 Feb 14
1059548
Marker grazing-incidence X-ray photon correlation spectroscopy: a new tool to peer into the interfaces of nanoconfined polymer thin films
OSTI ID: 1059548 - Abstract not provided"
Jiang, Naisheng
,
Endoh, Maya K.
,
Koga, Tadanori
2013 Feb 13
1059551
Doping-Based Stabilization of the M2 Phase in Free-Standing VO[subscript 2] Nanostructures at Room Temperature
OSTI ID: 1059551 - Abstract not provided"
Strelcov, Evgheni
,
Tselev, Alexander
,
Ivanov, Ilia
, et.al.
2013 Feb 13
1063008
Temperature-dependent competing deformation mechanisms in nanocrystalline metals
OSTI ID: 1063008 - Abstract not provided"
Wang, Y.M.
,
Ott, R.T.
,
Besser, M.F.
, et.al.
2013 Feb 13
1060584
Dopant Location, Local Structure, and Electronic Properties of Au[subscript 24]Pt(SR)[subscript 18] Nanoclusters
OSTI ID: 1060584 - Abstract not provided"
Christensen, Stephen L.
,
MacDonald, Mark A.
,
Chatt, Amares
, et.al.
2013 Feb 12
1061308
Electro- and Photodriven Phase Change Composites Based on Wax-Infiltrated Carbon Nanotube Sponges
OSTI ID: 1061308 - Abstract not provided"
Chen, Liangjie
,
Zou, Ruqiang
,
Xia, Wei
, et.al.
2013 Feb 12
1062426
Structure and optical function of amorphous photonic nanostructures from avian feather barbs: a comparative small angle X-ray scattering (SAXS) analysis of 230 bird species
OSTI ID: 1062426 - Abstract not provided"
Saranathan, Vinodkumar
,
Forster, Jason D.
,
Noh, Heeso
, et.al.
2013 Feb 12
1062430
Effects of Formation Conditions on the Physicochemical Properties, Aggregation, and Phase Transformation of Iron Oxide Nanoparticles
OSTI ID: 1062430 - Abstract not provided"
Ray, Jessica R.
,
Wan, Wei
,
Gilbert, Benjamin
, et.al.
2013 Feb 12
1063005
Ultrahard nanotwinned cubic boron nitride
OSTI ID: 1063005 - Abstract not provided"
Tian, Yongjun
,
Xu, Bo
,
Yu, Dongli
, et.al.
2013 Feb 11
1060580
Comparison of Nanoscaled and Bulk NiO Structural and Environmental Characteristics by XRD, XAFS, and XPS
OSTI ID: 1060580 - Abstract not provided"
Peck, Matthea A.
,
Langell, Marjorie A.
2013 Feb 07
PNNL-SA-92648
Standardizng Data
OSTI ID: 1063695 - To enable the rational design of nanomaterials for improved efficacy and safety, it is critical to understand and exploit the physicochemical properties that drive biological behavior (Morris, 2010). Data mining and computer simulation are essential for deriving information about nanomaterial behavior; however, the datasets needed to support such studies are sparse and stored across a variety of repositories and resources. Schrurs and Lison (2012) have expressed the need for more coherence and structure in the conduct of nanotechnology research. Additionally, the lack of common reporting standards and non-uniformity of information reported have proven to be significant barriers to such data sharing and re-use. The Nanotechnology Working Group (Nano WG), of the US National Institutes of Health National Cancer Informatics Program, has been focused on addressing these barriers. The Nano WG - which includes representatives from over 20 organizations including government agencies, academia, industry, standards organizations, and alliances -has developed ISA-TAB-Nano (Thomas et al, 2013), a general framework for representing and integrating diverse types of data related to the description and characterization of nanomaterials. Recognizing that nanoparticle characterization studies have many of the same challenges as ‘omics-based assays, the Nano WG joined the ISA Commons (Sansone et al., 2012) to leverage lessons learned in ‘omics data sharing. The ISA Commons community brings together 50 collaborators at over 30 scientific organizations around the globe, including regulatory and industrial participants in an increasingly diverse set of life science domains. At the core of the ISA Commons is the ISA metadata tracking framework which forms the basis for the ISA-TAB-Nano extension. The extension of the ISA framework to nanotechnology domain illustrates the power of a synergistic approach that seeks the interoperability of data across multiple research disciplines. To increase adoption, especially in the commercial arena from vendors and manufactures, the ISA-Tab-Nano data-sharing specification has also been submitted for consideration as a standard to the American Society for Testing and Materials (ASTM). Delivering a community-driven specification is only the first phase of the process. To be useful and used, ISA-TAB-Nano must be implemented by tools and databases to assist researchers in reporting their data accordingly, shielding them from unnecessary complexity. Our next step is to extend the open source ISA Software Suite to provide user-oriented tools for the collection, curation, and storage of data compliant with the ISA-TAB-Nano specification. Future work will also focus on the application of the ISA-TAB-Nano format to support emerging standards on minimal information about nanomaterials in biological research (Ostraat et al, 2012; MinChar). ISA-TAB-Nano development is a community-driven effort and we welcome new contributions, collaborations and domain expertise. We invite researchers, software developers, vendors, and other stakeholders to work with us to implement the ISA-Tab-Nano format in their existing systems and research. Likewise, we welcome engagement of regulators, funding agencies, editors, and other policy makers to discuss how this standard can be used to facilitate the sharing and reuse of nanotechnology data across a wide range of disciplines. More information about the ISA-TAB-Nano project can be found online at https://wiki.nci.nih.gov/display/ICR/ISA-TAB-Nano."
Baker, Nathan A.
,
Klemm, Juli
,
Harper, Stacey
, et.al.
2013 Feb 05
PNNL-SA-92348
The Vital Function of Fe3O4@Au nanocomposites for Hydrolase Biosensor Design and Its Application in Detection of Methyl Parathion
OSTI ID: 1063728 - A nanocomposite of gold nanoparticles (AuNPs) decorating a magnetic Fe3O4 core was synthesized using cysteamine (SH–NH2) as linker, and characterized by TEM, XPS, UV and electrochemistry. Then a hydrolase biosensor, based on self-assembly of methyl parathion hydrolase (MPH) on the Fe3O4@Au nanocomposite, was developed for sensitive and selective detection of the organophosphorus pesticide (OP) methyl parathion. The magnetic nanocomposite provides an easy way to construct the enzyme biosensor by simply exerting an external magnetic field, and also provides a simple way to renew the electrode surface by removing the magnet. Unlike inhibition-based enzyme biosensors, the hydrolase is not poisoned by OPs and thus is reusable for continuous measurement. AuNPs not only provide a large surface area, high loading efficiency and fast electron transfer, but also stabilize the enzyme through electrostatic interactions. The MPH biosensor shows rapid response and high selectivity for detection of methyl parathion, with a linear range from 0.5 to 1000 ng/mL and a detection limit of 0.1 ng/mL. It also shows acceptable reproducibility and stability. The simplicity and ease of operation of the proposed method has great potential for on-site detection of P–S containing pesticides and provides a promising strategy to construct a robust biosensor."
Zhao, Yuting
,
Zhang, Weiying
,
Lin, Yuehe
, et.al.
2013 Feb 04
SAND2013-0857C
Single Ion Implant of Self-Aligned Poly-Silicon Nanostructures .
OSTI ID: 1062806 - Abstract Not Provided"
Bielejec, Edward S.
,
Bishop, Nathaniel
,
Carroll, Malcolm S.
, et.al.
2013 Feb 01
SAND2013-0792C
Optical Super-Resolution: The Promise for Visualizing Biological Processes at the Nanoscale.
OSTI ID: 1062849 - Abstract Not Provided"
Timlin, Jerilyn A.
2013 Feb 01
SAND2013-0870C
Strong coupling between metamaterial resonators and AlAs nano layers.
OSTI ID: 1062863 - Abstract Not Provided"
Liu, Sheng.
,
Benz, Alexander
,
Reno, John L.
, et.al.
2013 Feb 01
SAND2013-0971C
Synthesis Development and Characterization of Novel Barium Titanate Lead Lanthanum Zirconate Titanate and NiCuZn Ferrite Nanoparticle Materials.
OSTI ID: 1062910 - Abstract Not Provided"
Diantonio, Christopher
,
Chavez, Thomas P.
,
Hernandez-Sanchez, Bernadette A.
, et.al.
2013 Feb 01
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