ExxonMobil

About: ExxonMobil is a company organization based out in Irving, Texas, United States. It is known for research contribution in the topics: Catalysis & Polymer. The organization has 16969 authors who have published 23758 publications receiving 535713 citations. The organization is also known as: Exxon Mobil Corporation & Exxon Mobil Corp..

Catalytic Properties of Single Layers of Transition Metal Sulfide Catalytic Materials

Abstract: Single layer transition metal sulfides (SLTMS) such as MoS2, WS2, and ReS2, play an important role in catalytic processes such as the hydrofining of petroleum streams, and are involved in at least two of the slurry‐catalyst hydroconversion processes that have been proposed for upgrading heavy petroleum feed and other sources of hydrocarbon fuels such as coal and shale oils. Additional promising catalytic applications of the SLTMS are on the horizon. The physical, chemical, and catalytic properties of these materials are reviewed in this report. Also discussed are areas for future research that promise to lead to advanced applications of the SLTMS.

Plasticized polyolefin compositions

Abstract: The present invention relates to plasticized polyolefin compositions comprising a polyolefin and a non-functionalized hydrocarbon plasticizer.

Morphology of Semicrystalline Block Copolymers of Ethylene-(Ethylene-alt-propylene)

Abstract: The morphology of a series of ethylene-(ethylene-alt-propylene) diblock copolymere (E/EP), in which microphase separation is driven by crystallization, has been investigated. The E/EP diblock were prepared by catalytic hydrogenation of narrow-distribution butadiene-isoprene diblocks. All the diblocks crystallized from single-phase melts so that the morphology and domain size were not restricted by «freezing» of a microphase-separated melt. The E/EP diblock adopted a lamellar morphology over the full range of compositions studied (E block fractions ranging from 0.12 to 0.56), and also exhibited spherulitic superstructure

Photoemission from mass-selected monodispersed Pt clusters.

Abstract: We report measurements of the valence- and core-level photoemission spectra of mass-selected, monodispersed Pt clusters For individual samples consisting of the platinum atom through the six-atom cluster deposited onto a silica substrate, we have followed the development of the individual valence-band electronic structure and the Pt 4{ital f} core-electron binding energy, and conclude that such small metal clusters do not yet exhibit metallic character

Long-range correlations in sedimentation

Abstract: Using particle image velocimetry we have measured the sedimentation dynamics of non-Brownian colloidal spheres over a wide range of low concentrations ( $\ensuremath{\varphi}\ensuremath{\le}0.05$) and sample cell sizes $W$. Fluctuations in the settling velocity show universal large-scale finite-range correlations, in the form of swirls, which depend simply on volume fraction and particle radius and follow $〈\ensuremath{\delta}{V}_{z}(0)\ensuremath{\delta}{V}_{z}(z){〉}^{1/2}\ensuremath{\simeq}{2.0V}_{\mathrm{sed}}{\ensuremath{\varphi}}^{1/3}\mathrm{exp}(\ensuremath{-}z/2\ensuremath{\xi})$, where $\ensuremath{\xi}\ensuremath{\simeq}20a{\ensuremath{\varphi}}^{\ensuremath{-}1/3}$. In turn, the predicted divergence of the velocity variance with increasing cell size $W$ is cut off in a universal way as $W$ exceeds the swirl size and is well represented by $〈\ensuremath{\delta}{V}_{z}^{2}(0){〉}^{1/2}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2.0V}_{\mathrm{sed}}{\ensuremath{\varphi}}^{1/3}[1\ensuremath{-}\mathrm{exp}(\ensuremath{-}W/60a{\ensuremath{\varphi}}^{\ensuremath{-}1/3})]$.