Malcolm L. H. Green

Bio: Malcolm L. H. Green is an academic researcher from University of Oxford. The author has contributed to research in topics: Carbon nanotube & Cyclopentadienyl complex. The author has an hindex of 82, co-authored 800 publications receiving 31121 citations. Previous affiliations of Malcolm L. H. Green include Gas Technology Institute & University of Illinois at Urbana–Champaign.

Imaging lattice defects and distortions in alkali-metal iodides encapsulated within double-walled carbon nanotubes

Abstract: The alkali-metal iodide double-walled carbon nanotube composites MI@DWNTs (M = K, Cs) have been prepared using a melt-phase filling procedure. The imaging and subsequent structural analysis of the encapsulated metal iodide crystals was performed with a combination of phase restored high-resolution transmission electron microscopy technique, structural modeling, and image simulation. The atomically resolved structures of the MI crystals were seen to contain several lattice defects including interstitials and vacancies as well as distortions of the crystal planes including shearing and rotation.

Relevance of the Co1-xNixWO4 wolframite-type mixed oxide compositions on the synthesis and catalytic properties of W-based carbides

Abstract: A series of wolframite-type oxides (Co1−xNixWO4) with various compositions was prepared by urea-matrix combustion method and subsequently carburized using a temperature-programmed reaction (1 °C min−1) under a mixture of 10 vol% C2H6/H2, from room temperature to 700 °C, to obtain a mixed Co, Ni and W carbide catalysts The catalytic performance was evaluated in a continuous flow reactor using hydrodenitrogenation of pyridine as model reaction The wolframite-type oxides and the carbide catalysts pre- and post-HDN reaction were characterized using elemental analysis, X-ray diffraction (XRD), laser Raman spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetric (DSC), transmission electron microscopy (TEM) and BET surface area measurements Urea-matrix combustion method is a convenient tool to prepare highly pure wolframite-type oxides, whose composition affects strongly the W-based carbide phase distribution and the HDN catalytic behaviour At Ni compositions lower than Co contents the formation of Co3W3C and β-W2C carbides is favoured, whereas at Ni compositions greater than those of Co the main phases were Ni and α-WC At intermediate composition (Co05Ni05WCx) bimetallic and monometallic carbides were formed The CoWCx bimetallic catalyst showed greater activity in the steady state than Ni-containing catalysts The HDN active phase present in CoWCx is different than that present in the Ni-containing catalysts, that is, carbon–metal bond strength of the bimetallic carbide, for the former, and metal nickel or weak Ni C bond, for the latter, play a very important role in the catalytic process

Unsuspected myasthenia gravis presenting as respiratory failure.

Abstract: A patient developed respiratory failure after surgical removal of a recurrent thymoma, which necessitated removal of part of the diaphragm. The respiratory failure was due to previously undiagnosed myasthenia gravis, which had selectively affected the respiratory muscles.

Oxidative oligomerisation of methane to aromatics

Abstract: The temperature, pressure and residence time effects on the reactions of methane and oxygen over an empty silica tube have been studied. It has been found that at elevated pressure and temperature a considerable amount of aromatics (benzene and toluene) is formed. The yield of aromatic products is comparable to that for the gas-phase production of methanol, and is higher than that reported for form-aldehyde. Metal oxide catalysts enhance the selectivity and the yield of aromatics. Thus, chlorine-promoted manganese oxide gives a consistently higher yield of aromatics than the empty tube reactions. However, we are unable to reproduce recent reports of high benzene selectivity over supported nickel catalysts. The mechanisms for the formation of aromatics have been investigated and the possible path-ways are discussed.

Single-shell carbon nanotubes of 1-nm diameter

Abstract: CARBON nanotubes1 are expected to have a wide variety of interesting properties. Capillarity in open tubes has already been demonstrated2–5, while predictions regarding their electronic structure6–8 and mechanical strength9 remain to be tested. To examine the properties of these structures, one needs tubes with well defined morphologies, length, thickness and a number of concentric shells; but the normal carbon-arc synthesis10,11 yields a range of tube types. In particular, most calculations have been concerned with single-shell tubes, whereas the carbon-arc synthesis produces almost entirely multi-shell tubes. Here we report the synthesis of abundant single-shell tubes with diameters of about one nanometre. Whereas the multi-shell nanotubes are formed on the carbon cathode, these single-shell tubes grow in the gas phase. Electron diffraction from a single tube allows us to confirm the helical arrangement of carbon hexagons deduced previously for multi-shell tubes1.

Chemistry and properties of nanocrystals of different shapes.

Abstract: The interest in nanoscale materials stems from the fact that new properties are acquired at this length scale and, equally important, that these properties * To whom correspondence should be addressed. Phone, 404-8940292; fax, 404-894-0294; e-mail, mostafa.el-sayed@ chemistry.gatech.edu. † Case Western Reserve UniversitysMillis 2258. ‡ Phone, 216-368-5918; fax, 216-368-3006; e-mail, burda@case.edu. § Georgia Institute of Technology. 1025 Chem. Rev. 2005, 105, 1025−1102

Carbon Nanotubes: Present and Future Commercial Applications

Abstract: Worldwide commercial interest in carbon nanotubes (CNTs) is reflected in a production capacity that presently exceeds several thousand tons per year. Currently, bulk CNT powders are incorporated in diverse commercial products ranging from rechargeable batteries, automotive parts, and sporting goods to boat hulls and water filters. Advances in CNT synthesis, purification, and chemical modification are enabling integration of CNTs in thin-film electronics and large-area coatings. Although not yet providing compelling mechanical strength or electrical or thermal conductivities for many applications, CNT yarns and sheets already have promising performance for applications including supercapacitors, actuators, and lightweight electromagnetic shields.

Nanoparticle therapeutics: an emerging treatment modality for cancer

Abstract: Nanoparticles — particles in the size range 1–100 nm — are emerging as a class of therapeutics for cancer. Early clinical results suggest that nanoparticle therapeutics can show enhanced efficacy, while simultaneously reducing side effects, owing to properties such as more targeted localization in tumours and active cellular uptake. Here, we highlight the features of nanoparticle therapeutics that distinguish them from previous anticancer therapies, and describe how these features provide the potential for therapeutic effects that are not achievable with other modalities. While large numbers of preclinical studies have been published, the emphasis here is placed on preclinical and clinical studies that are likely to affect clinical investigations and their implications for advancing the treatment of patients with cancer.

Chemistry of Carbon Nanotubes

Abstract: Department of Materials Science, University of Patras, 26504 Rio Patras, Greece, Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Avenue, 116 35 Athens, Greece, Institut de Biologie Moleculaire et Cellulaire, UPR9021 CNRS, Immunologie et Chimie Therapeutiques, 67084 Strasbourg, France, and Dipartimento di Scienze Farmaceutiche, Universita di Trieste, Piazzale Europa 1, 34127 Trieste, Italy