The hydrothermal synthesis of zeolites: precursors, intermediates and reaction mechanism

Recent advances in synthesis, physical properties and applications of conducting polymer nanotubes and nanofibers

Supramolecular electronics; nanowires from self-assembled pi-conjugated systems.

Geopolymers are a class of aluminosilicate materials synthesized by alkaline or alkali-silicate activation of solid alumina- and silica-containing precursor materials at ambient or higher temperature. These products have highly significant commercial and technological potential, but the exact physicochemical nature of the geopolymeric binder phase has never before been determined. Through analysis of existing experimental results from the literature and comparison with related systems, in particular the hydrothermal synthesis of zeolites, geopolymeric binders are identified as being comprised of agglomerates of nanocrystalline zeolites compacted by an amorphous gel phase. The degree of crystallinity is largely determined by product formulation and synthesis conditions. Results from powder X-ray diffraction, microscopy, electron diffraction, mechanical strength testing, and calorimetry are analyzed and shown to be consistent with the theory presented. The implications of nanocrystallinity are discussed, an...

Do Geopolymers Actually Contain Nanocrystalline Zeolites? A Reexamination of Existing Results

This paper presents a comprehensive review of the literature on one-dimensional (1D) nanostructures (nanowires, nanoribbons, nanotubes, nanobelts, and nanofibers) of π-conjugated small molecules, oligomers, and polymers. The diverse methods used in assembling the molecular building blocks into 1D functional nanostructures and nanodevices are discussed, including hard and soft template-assisted synthesis, electrospinning, nanolithography, self-assembly in solution and at interfaces, physical vapor transport, and other strategies. Optical, charge transport, electronic, and photoconductive properties of nanowires and nanotubes of selected classes of π-conjugated molecular systems are discussed next, highlighting unique features of the 1D nanostructures compared to 2D thin films. Overview of applications of these 1D organic nanostructures ranging from nanoscale light-emitting diodes, field-emission devices, organic photovoltaics, sensors/biosensors, spin-electronics, and nanophotonics to nanoelectronics is th...

One-Dimensional Nanostructures of π-Conjugated Molecular Systems: Assembly, Properties, and Applications from Photovoltaics, Sensors, and Nanophotonics to Nanoelectronics†

Infection and inflammation are risk factors in the initiation and progression of atherosclerosis. Periodontitis is one of the most prevalent chronic inflammations of the oral cavity, and has been reported to be associated with systemic disease. In this study, we evaluated whether the heat-shock protein GroEL of Fusobacterium nucleatum, one of the most prevalent bacteria in periodontitis, induces factors that predispose to atherosclerosis in human microvascular endothelial cells (HMEC-1) and apolipoprotein E-deficient (ApoE(-/-)) mice. GroEL induced the expression of chemokines such as monocyte chemoattractant protein-1 and interleukin-8 as well as cell adhesion molecules, such as intercellular adhesion molecule 1, vascular cell adhesion molecule 1, and E-selectin. GroEL induced the activity of tissue factor and reduced the activity of the tissue factor pathway inhibitor. Foam cell formation was induced by GroEL. GroEL-injected ApoE(-/-) mice showed significant atherosclerotic lesion progression compared with control mice. Serum levels of risk factors for atherosclerosis such as interleukin-6, C-reactive protein, and low-density lipoprotein were increased in GroEL-injected ApoE(-/-) mice compared with control mice, whereas serum levels of high-density lipoprotein were decreased. We could detect significantly higher levels of anti-F. nucleatum GroEL antibody in serum and F. nucleatum DNA in gingival crevicular fluid from patients with periodontitis than in that from healthy subjects. Our results indicate that the host response to the GroEL of periodontal pathogens like F. nucleatum may be a mechanism involved in atherosclerosis, supporting the association of periodontitis and systemic infection.

Fusobacterium nucleatum GroEL induces risk factors of atherosclerosis in human microvascular endothelial cells and ApoE(-/-) mice.

Intercalation of magnesium–urea complex into swelling clay

Nanotransport in polyacetylene single fiber: Toward the intrinsic properties

Nanocrystalline sodalite has been synthesized by a non-hydrothermal route from a solid gel mixture of Al2O3 pillared clay and NaOH at 80 °C. The nucleation and crystal growth mechanism for the soli...

S.H. Lee

Papers

Fusobacterium nucleatum GroEL induces risk factors of atherosclerosis in human microvascular endothelial cells and ApoE(-/-) mice.

Intercalation of magnesium–urea complex into swelling clay

Nanotransport in polyacetylene single fiber: Toward the intrinsic properties

Nanocrystalline Sodalite from Al2O3 Pillared Clay by Solid−Solid Transformation

Vacuum seeding and secondary growth route to sodalite membrane