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CCDC 242449: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Advances in the Chemistry and Physics of Materials

No abstract is provided for this article.

Characterization of Nanomaterials by Physical Methods

Much progress in nanoscience and nanotechnology has been made in the past few years thanks to the increased availability of sophisticated physical methods to characterize nanomaterials. These techniques include electron microscopy and scanning probe microscopies, in addition to standard techniques such as X-ray and neutron diffraction, X-ray scattering, and various spectroscopies. Characterization of nanomaterials includes the determination not only of size and shape, but also of the atomic and electronic structures and other important properties. In this article we describe some of the important methods employed for characterization of nanostructures, describing a few case studies for illustrative purposes. These case studies include characterizations of Au, ReO 3 , and GaN nanocrystals; ZnO, Ni, and Co nanowires; inorganic and carbon nanotubes; and two-dimensional graphene.

Metal–Insulator Transitions in Metal Clusters: A High-Energy Spectroscopy Study of <font>Pd</font> and <font>Ag</font> Clusters

Theory of Point Defects in Ionic Crystals

No abstract is provided for this article.

Raman scattering in charge-ordered Pr_0.63Ca_0.37MnO₃: Anomalous temperature dependence of linewidth

We report on the evolution of the Raman-active Ag phonon modes in the charge-ordered manganite Pr0.63Ca0.37MnO3 as a function of temperature from 300 K to 25 K. Our studies reveal that the linewidths of the Ag(2) and Ag(4) phonons increase as temperature decreases. This anomalous temperature dependence of phonon lineshapes, seen for the first time in charge-ordered manganites, can be quantitatively understood in terms of a strong spin-phonon coupling involving t2g spins and Ag phonons.

An EXAFS study of Cu/ZnO and Cu/ZnO-Al2O3 methanol synthesis catalysts

No abstract is provided for this article.

Electrical conductivities of polymeric metal complexes

No abstract is provided for this article.

Laser-induced unzipping of carbon nanotubes to yield graphene nanoribbons

Irradiation of undoped and doped multi-walled carbon nanotubes by an excimer laser (energy ∼200–350 mJ) yields graphene nanoribbons (GNRs). The GNRs so obtained have been characterized by transmission electron microscopy, atomic force microscopy and Raman spectroscopy.

MoS₂ and WS₂ Analogues of Graphene

Inorganic sheets: Graphene-like MoS2 and WS2 were prepared by three different chemical methods. Examination by microscopic techniques revealed that they consist of one or a few layers (see depicted TEM image of WS2 layers), and an atomic-resolution TEM image showed that layered MoS2 has a hexagonal arrangement of Mo and S atoms (see inset).

Novel Nanocomposites Made of Boron Nitride Nanotubes and a Physical Gel

This article describes successful incorporation of multiwalled boron nitride nanotubes (BNNTs) and various functionalized BNNTs by Lewis bases such as trioctylamine (TOA), tributylamine (TBA), and triphenylphosphine (TPP), etc., in organogels formed by triphenylenevinylene (TPV)-based low molecular weight gelator (LMWG) in toluene and consequent characterization of the resulting gel nanocomposites. Functionalized BNNTs were synthesized first, and the presence of tubular structures with high aspect ratio and increased diameter compared to the starting BNNTs was confirmed by SEM, TEM, and Raman spectroscopy. The micrographs of composites of 1 and BNNTs showed evidence of wrapping of the gelator molecules on to the BNNT surface presumably brought about by pi-pi stacking and van der Waals interactions. This leads to the formation of densely packed and directionally aligned fibrous networks. Such "reinforced" aggregation of the gelator molecules in presence of doped BNNTs led to an increase in the sol-to-gel transition temperature and the solidification temperature of the gel nanocomposites as revealed from differential scanning calorimetry. Rheological investigations of the gel nanocomposites indicate that the flow properties of the resulting materials become resistant to applied stress upon incorporation of even a very low wt % of BNNTs. Finally, the increase in thermal conductivity of the nanocomposite compared to the gelator alone was observed for the temperature range of 0-60 degrees C which may make these composites potentially useful in various applications depending on the choice and the amount of BNNT loading in the composite.

Strong metal-support interaction in nickel/niobium pentoxide and nickel/titania catalysts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong metal-support interaction in nickel/niobium pentoxide and nickel/titania catalystsG. Sankar, S. Vasudevan, and C. N. R. RaoCite this: J. Phys. Chem. 1988, 92, 7, 1878–1882Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 April 1988https://pubs.acs.org/doi/10.1021/j100318a036https://doi.org/10.1021/j100318a036research-articleACS PublicationsRequest reuse permissionsArticle Views187Altmetric-Citations21LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

A calorimetric investigation of the assembly of gold nanorods to form necklaces

Interaction of gold nanorods with cysteine as well as 3-mercaptopropionic acid (MPA) has been investigated by isothermal titration calorimetry (ITC), in combination with electronic absorption spectroscopy and electron microscopy. The assembly process with MPA shows two steps, the first due to the binding of MPA to gold nanorods through the sulfur atom, and the second due to assembly of the MPA capped gold nanorods through the formation of cyclic hydrogen bonded dimers between the MPA molecules. In the case of cysteine only a single step is observed in ITC, due to the binding of the molecules to gold nanorods.

Simple Synthesis of 2D Molybdenum Carbide Nanosheets and Their Application in the Hydrogen Evolution Reaction

We have synthesized two phases of 2D molybdenum carbides (α‐MoC 1‐x , β‐Mo 2 C) in nanosheets form and use them as electrocatalysts for the hydrogen evolution reaction. The procedure involves the preparation of hexadecylamine intercalated molybdenum oxide (MoO 3 ‐HDA) nanosheets at room temperature, followed by heating at a high temperature for different duration (900 °C) in nitrogen atmosphere. α‐MoC 1‐x and β‐Mo 2 C nanosheets have been characterized by scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS) and other techniques. α‐MoC 1‐x exhibits good HER electrocatalytic performance and is chemically stable for a longer time in acidic conditions.

Semiconductor--metal transitions in NbO$sub 2$ and Nb/sub 1-x/V/sub x/O$sub 2$

No abstract is provided for this article.

Structure–property relationship in superconducting cuprates

C. N. R. Rao and A. K. Ganguli, Chem. Soc. Rev., 1995, 24, 1 DOI: 10.1039/CS9952400001

Structure and properties of Tl0.5Pb0.5Sr2Gd2−xCexCu2O9−δ

A systematic study of the Tl 0.5 Pb 0.5 Sr 2 Gd 2−x Ce x Cu 2 O 9−δ system has revealed the existence of a pure phase in the compositional. range 0.0≤x≤0.6 crystalizzing in the 1222 structure. It has an intersheet distance of approximately 6 Å, a value much higher than those found in other cuprates with double CuO2 sheets interleaved by a single fluorite layer. Superconductivity has been observed in the range 0.1≤x≤0.4 with a T c of 45 K and a superconductive volume fraction up to 20% for the optimal composition. An interesting variation of the superconducting properties of the above system with the composition, i.e. cerium content, has also been noticed. A possible dependence of superconductivity on the coupling between CuO2 sheets in the layered cuprates has been pointed out to bring out a correlation between structure and properties.

CCDC 274224: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.