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22 results on '"Sines, Ian T."'

2. On-wire conversion chemistry: engineering solid-state complexity into striped metal nanowires using solution chemistry reactions

Author

Anderson, Mary E., Buck, Mattew R., Sines, Ian T., Oyler, Karl D., and Schaak, Raymond E.

Subjects
Nanotechnology -- Research, Platinum -- Chemical properties, Solvation -- Analysis, Chemistry
Abstract

The process of transforming single-component metal nano wires into multisegment nanowires with multimetal components is discussed. These solution chemistry conversion reactions provide a cpnvenient tool kit for engineering complex solid-state compoenets into template-grown metal nanowires.

Published
2008

19. Engineering Porosity intoSingle-Crystal ColloidalNanosheets Using Epitaxial Nucleation and Chalcogenide Anion ExchangeReactions: The Conversion of SnSe to SnTe.

Author

Sines, Ian T., Vaughn, Dimitri D., Biacchi, Adam J., Kingsley, Corinne E., Popczun, Eric J., and Schaak, Raymond E.

Subjects
*POROSITY, *SINGLE crystals, *COLLOIDAL crystals, *NANOSTRUCTURED materials, *TIN compounds, *NUCLEATION, *EPITAXY, *CHALCOGENIDES
Abstract

Single-crystal colloidal SnSe nanosheets react with atrioctylphosphine–telluriumcomplex to transform into porous single-crystal SnTe nanosheets withoriented nanocube protrusions. This chemical transformation reaction,which provides chemical and crystallographic guidelines for designingsecondary nanostructural features into single crystal colloidal nanosheetsand also results in two-dimensional nanosheets of a three-dimensionallybonded material, proceeds via a diffusion-mediated anion exchangepathway. Intermediate nanosheets reveal that SnTe nucleates with crystallographicalignment on the surface of the SnSe nanosheet, which ultimately isconsumed to produce the porous SnTe nanosheet product. The anion exchangereaction is general, successfully converting a library of metal selenidesand sulfides to the corresponding tellurides. [ABSTRACT FROM AUTHOR]

Published
2012
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20. Phase-Selective Chemical Extraction of Selenium and Sulfur from Nanoscale Metal Chalcogen ides: A General Strategy for Synthesis, Purification, and Phase Targeting.

Author

Sines, Ian T. and Schaak, Raymond E.

Subjects
*NANOCHEMISTRY, *PROPERTIES of matter, *CHALCOGENIDES, *SULFIDES, *NANOPARTICLES, *CHEMISTRY
Abstract

Controlling the composition and phase formation of bulk and nanoscale solids underpins efforts to control physical properties. Here, we introduce a powerful new chemical pathway that facilitates composition-tunable synthesis, post-synthesis purification, and precise phase targeting in metal chalcogenide systems. `When metal sele-nides and sulfides react with trioctylphosphine (TOP) at temperatures that range from 65 to 270 °C, selenium and sulfur are selectively extracted to produce the most metal-rich chalcogenide that is stable in a particular binary system. This general approach is demonstrated for SnSe2, FeS2, NiSe2, and CoSe2, which convert to SnSe, FeS, Ni3Se2, and Co9Se8, respectively. In-depth studies of the Fe-Se system highlight the precise phase targeting and purification that is achievable, with PbO-type FeSe (the most metal-rich stable Fe-Se phase) forming exclusively when other Fe-Se phases, including mixtures, react with TOP. This chemistry also represents a new template-based nanoparticle "conversion chemistry" reaction, transforming hollow NiSe2 nano-spheres into hollow NiSe nanospheres with morphological retention. [ABSTRACT FROM AUTHOR]

Published
2011
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21. Magnetically Directed Two-Dimensional Crystallization of OmpF Membrane Proteins in Block Copolymers

Author

Manish Kumar, Kaushik Dayal, Meagan S. Mauter, Ian T. Sines, Thomas Walz, Po-Lin Chiu, Steven S. Klara, Mahnoush Babaei, Rita Dezorzi, Patrick O. Saboe, Klara, Steven S., Saboe, Patrick O., Sines, Ian T., Babaei, Mahnoush, Chiu, Po Lin, DE ZORZI, Rita, Dayal, Kaushik, Walz, Thoma, Kumar, Manish, and Mauter, Meagan S.

Subjects
Diffraction, Polymers, Porins, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Catalysis, law.invention, Catalysi, chemistry.chemical_compound, symbols.namesake, Magnetics, Colloid and Surface Chemistry, law, Copolymer, Crystallization, Ethylene oxide, Chemistry (all), General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Magnetic field, Membrane, Fourier transform, chemistry, Membrane protein, Chemical engineering, symbols, 0210 nano-technology
Abstract

Two-dimensional (2D) alignment and crystallization of membrane proteins (MPs) is increasingly important in characterizing their three-dimensional (3D) structure, in designing pharmacological agents, and in leveraging MPs for biomimetic devices. Large, highly ordered MP 2D crystals in block copolymer (BCP) matrices are challenging to fabricate, but a facile and scalable technique for aligning and crystallizing MPs in thin-film geometries would rapidly translate into applications. This work introduces a novel method to grow larger and potentially better ordered 2D crystals by performing the crystallization process in the presence of a strong magnetic field. We demonstrate the efficacy of this approach using a β-barrel MP, outer membrane protein F (OmpF), in short-chain polybutadiene-poly(ethylene oxide) (PB-PEO) membranes. Crystals grown in a magnetic field were up to 5 times larger than conventionally grown crystals, and a signal-to-noise (SNR) analysis of diffraction peaks in Fourier transforms of specimens imaged by negative-stain electron microscopy (EM) and cryo-EM showed twice as many high-SNR diffraction peaks, indicating that the magnetic field also improves crystal order.

Published
2015

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