Search results for "GOLD"

showing 10 items of 1320 documents

Symmetry breaking in ligand-protected gold clusters probed by nonlinear optics

2016

The first hyperpolarizabilities of [Au25(SR)18](-1/0) and Au38(SR)24 clusters were determined by Hyper-Rayleigh Scattering. A strong dependence on the molecular symmetry was observed, and we explore two strategies to destroy the center of inversion in [Au25(SR)18](-1/0), protection by chiral ligands and alloying of the cluster with silver. This may open new avenues to applications of Au : SR clusters in second-order nonlinear optics.

ta114Condensed matter physicsligandsChemistryScatteringLigandnonlinear opticsNonlinear optics02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnologygold clusters01 natural sciencesMolecular physics0104 chemical sciencesmolecular symmetryMolecular symmetryCluster (physics)General Materials ScienceSymmetry breaking0210 nano-technologyta116Nanoscale
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The Role of the Anchor Atom in the Ligand of the Monolayer-Protected Au25(XR)18– Nanocluster

2015

We present a density functional theory (DFT) investigation on the role of the anchor atom and ligand on the structural, electronic, and optical properties of the anionic Au25(XR)18– nanocluster (X = S, Se, Te; R = H, CH3, and (CH2)2Ph). Substituting the anchor atom with other group 16 elements induces subtle changes in the Au–Au and Au–X bond lengths and polarization of the covalent bond. The changes in the electronic structure based on substituting both the anchor and R groups are presented through careful analysis of the density of states and theoretical determined optical spectra. We give a detailed side-by-side comparison into the structural, electronic, and optical properties of Au25(X…

ta114LigandChemistryligandsElectronic structureanchor atomsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsBond lengthCrystallographyGeneral EnergyCovalent bondComputational chemistryAtomMonolayerDensity of statesDensity functional theoryPhysical and Theoretical Chemistryta116gold nanoclustersJournal of Physical Chemistry C
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Emotions and Technoethics

2020

The relationship between emotions and ethics has been debated for centuries. The act of understanding emotions through the framework of ethics involves accepting that emotions are to some extent culturally dependent. By linking emotions in design to larger ethical discussions, it may be accepted that ethics and design are both technological constructions designed to shape a collective worldview. While both are cultural constructions, they are in constant dialogue with one another through social discourse and individualistic cognitive–affective appraisal processes. This chapter presents an account of technoethics that challenges ideas of ethical values embedded within technology, drawing att…

technoethicsmedia_common.quotation_subjectihmisen ja tietokoneen vuorovaikutusdesigntekoälyEthical valuesemotionsartificial intelligenceEpistemologyInterdependenceIndividualismsuunnitteluexperiencethe golden ruletunteetIntentionalitykokemuksetihminen-konejärjestelmätetiikkakäyttäjäkokemusPsychologySocial discoursemedia_common
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CCDC 953879: Experimental Crystal Structure Determination

2013

Related Article: Huayan Yang, Yu Wang, Huaqi Huang, Lars Gell, Lauri Lehtovaara, Sami Malola, Hannu Hakkinen, Nanfeng Zheng|2013|Nat.Commun.|4|2422|doi:10.1038/ncomms3422

tetrakis(Tetraphenylphosphonium) tetracosakis(mu3-34-difluorobenzenethiolato)-hexakis(mu2-34-difluorobenzenethiolato)-dodeca-gold-dotriaconta-silver dichloromethane solvateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 953883: Experimental Crystal Structure Determination

2013

Related Article: Huayan Yang, Yu Wang, Huaqi Huang, Lars Gell, Lauri Lehtovaara, Sami Malola, Hannu Hakkinen, Nanfeng Zheng|2013|Nat.Commun.|4|2422|doi:10.1038/ncomms3422

tetrakis(Tetraphenylphosphonium) tetracosakis(mu~3~-4-(trifluoromethyl)benzenethiolato)-hexakis(mu~2~-4-(trifluoromethyl)benzenethiolato)-dodeca-gold-dotriaconta-silverSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 916957: Experimental Crystal Structure Determination

2013

Related Article: Igor O. Koshevoy, Yuh-Chia Chang, Antti J. Karttunen, Julia R. Shakirova, Janne Jänis, Matti Haukka, Tapani Pakkanen, Pi-Tai Chou|2013|Chem.-Eur.J.|19|5104|doi:10.1002/chem.201204611

tetrakis(mu~2~-eta^2^-(9-hydroxy-9H-fluoren-9-yl)ethynyl)-bis(tetrahydrofuran)-di-copper-di-gold tetrahydrofuran solvateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 916958: Experimental Crystal Structure Determination

2013

Related Article: Igor O. Koshevoy, Yuh-Chia Chang, Antti J. Karttunen, Julia R. Shakirova, Janne Jänis, Matti Haukka, Tapani Pakkanen, Pi-Tai Chou|2013|Chem.-Eur.J.|19|5104|doi:10.1002/chem.201204611

tetrakis(mu~2~-eta^2^-(9-hydroxy-9H-fluoren-9-yl)ethynyl)-dipyridine-di-copper-di-gold tetrahydrofuran solvateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1020496: Experimental Crystal Structure Determination

2014

Related Article: Huayan Yang , Yu Wang , Juanzhu Yan , Xi Chen , Xin Zhang , Hannu Häkkinen , and Nanfeng Zheng|2014|J.Am.Chem.Soc.|136|7197|doi:10.1021/ja501811j

tetrakis(tetraphenylphosphonium) icosakis(mu-4-(trifluoromethyl)benzenethiolato)-trideca-gold-dodeca-copper dichloromethane solvate tetrahydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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Biodegradable Ultrasmall-in-Nano Gold Architectures: Mid-Period In Vivo Distribution and Excretion Assessment

2018

theranosticsPeriod (periodic table)Chemistry02 engineering and technologyGeneral ChemistryBiodegradationgold010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesbiodegradation0104 chemical sciencesExcretionIn vivoColloidal goldsilicaEnvironmental chemistryDistribution (pharmacology)General Materials Scienceexcretion0210 nano-technologybiodegradation; excretion; gold; silica; theranostics
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Recombinant nanocapsid for targeted theranostic delivery

2017

Developments in diagnostic and therapeutic delivery are trending towards molecular level targeting with nano-platforms. Targeted delivery reduces generalized distribution by localizing diagnostic and/or therapeutic (theranostic) molecules to an intended target site. The first section of this thesis proposes Hepatitis E Virus (HEV) nanocapsids as a vector to stabilize and target theranostic delivery. Derived from the capsid protein of HEV, a feco-orally transmitted virus, HEV-like particles self-assemble in to non-infectious, nanocapsids that can withstand harsh protease and pH conditions in the mucosal system. The flexible nanocapsid surface protrusion domain is amenable to substantial modi…

theranosticshepatiitti E -virusviruksetenterovirustargeted deliverybioconjugationyksilöity lääkehoitonanolääketiedekultaenteroviruksetnanocapsidkemialliset sidoksetgold nanoclusterhepatiittiviruksetencapsulationnanohiukkasetkapsidi
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