Materials Literature
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Manganese complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane (tmtacn) are highly active and selective alkene oxidation catalysts with aqueous H(2)O(2). Here, carboxylic acid-functionalized SiO(2) simultaneously immobilizes and activates these complexes under oxidation reaction conditions. H(2)O(2) and the functional…
A detailed study into the optimization of carbodiimide-mediated coupling of antibodies (Ab) and quantum dots (QD) for use in cellular imaging has been undertaken. This involved the grafting of commercially available carboxyl-modified QDs (Evident Technologies "Lake Placid Blue" Evitag and eBioscience's eflour nanocrys…
Vertically aligned multiwalled carbon nanotubes (v-MWCNTs) are functionalized using atomic oxygen generated in a microwave plasma. X-ray photoelectron spectroscopy depth profile analysis shows that the plasma treatment effectively grafts oxygen exclusively at the v-MWCNT tips. Electron microscopy shows that neither th…
Preparation of clean monodisperse samples of clusters and nanoparticles for characterization using cutting-edge analytical techniques is essential to understanding their size-dependent properties. Herein, we report a general method for the preparation of high surface coverage samples of monodisperse clusters containin…
We present experimental measurements of the electronic contribution to the Raman spectra of individual metallic single-walled carbon nanotubes (MSWNTs). Photoexcited carriers are inelastically scattered by a continuum of low-energy electron-hole pairs created across the graphenelike linear electronic subbands of the M…
The fabrication and characterization of a dual receptor targeted system (DRTS) are described. It is demonstrated that DRTS is more efficient at delivering gold nanoparticles (AuNPs) to ovarian cancer cells expressing epidermal growth factor receptor (EGFR) and folate receptor (FR) than their corresponding single-recep…
Abstract In this study, electrospun glass (structurally amorphous SiO 2 ) nanofibers (EGNFs) with diameters of ∼ 400 nm were incorporated into epoxy resin for reinforcement and/or toughening purposes; the effects of silanization treatment (including different functional groups in silane molecules) and mass fraction of…
The remarkable mechanical properties of graphene, the thinnest, lightest, and strongest material in existence, are desirable in applications ranging from composite materials to sensors and actuators. Here, we demonstrate that these mechanical properties are strongly affected by the interaction with the substrate onto…
CdSe nanoparticles (NPs) capped with cysteinate (Cys), 3-mercaptopropionate (MP), and mercaptosuccinate (MS) were adsorbed to TiO(2) from basic aqueous dispersions. Native capping groups served as molecular linkers to TiO(2). Thus, the materials-assembly chemistry was simplified and made more reproducible and environm…
The performance of nanomaterials for biomedical applications is highly dependent on the nature and the quality of surface coatings. In particular, the development of functionalized nanoparticles for magnetic resonance imaging (MRI) requires the grafting of hydrophilic, nonimmunogenic, and biocompatible polymers such a…
Heterogeneous catalysis is important in today’s industry. Hence, it is imperative to introduce students to this field and its tools. A new way of introducing one of these tools, the Sabatier principle, via a laboratory exercise is presented. A volcano plot is constructed for the well-known heterogeneous H 2 O 2 cataly…
The ZrB 2 powders with submicrometric particle size and low oxygen content were synthesized by a new borothermal reduction route using ZrO 2 and excess boron as raw materials. The conventional process only contained the borothermal reduction of ZrO 2 with boron at 1550°C. By exploring the mechanism of ZrB 2 particle c…
Lichtsammelnde Peptid-Nanoröhren entstehen durch Selbstorganisation von Diphenylalanin mit THPP und Platinnanopartikeln (nPt; siehe Bild; TEOA=Triethanolamin). Die lichtsammelnden Peptidnanoröhren eignen sich für die Nachahmung der Photosynthese aufgrund ihrer Struktur und elektrochemischen Eigenschaften, die denen de…
Single crystals free from external strains are inevitable for research of the anisotropic intrinsic properties of BiFeO 3 . We have established a procedure to grow highly insulating bulk single crystals of BiFeO 3 for the first time by a newly developed method called the laser-diode heating floating-zone (LDFZ) method…
There has been continuing effort to understand the cause for the thickness dependence observed in the glass transition dynamics of polymer films. In a previous experiment, we showed that a two-layer model, assuming the films to contain a high-mobility surface layer residing on top of a bulklike inner layer, can explai…
Ultrafine polyacrylonitrile (PAN) fiber mats were prepared by electrospinning and subsequently hydrolytically treated with a sodium hydroxide ethanolic/aqueous solution to impart the ability to chelate metal ions. This was achieved through the conversion of the nitrile functional groups on the surface of the PAN fiber…
We utilize femtosecond-to-microsecond time domain pump-probe transient absorption spectroscopy to interrogate for the first time the electronically excited triplet state of individualized single-wall carbon nanotubes (SWNTs). These studies exploit (6,5) chirality-enriched SWNT samples and poly[2,6-{1,5-bis(3-propoxysu…
The influence of a number of N-containing macromolecules on the polycondensation of silicic acid to form amorphous silica is studied by the combined use of 29 Si NMR spectroscopy and the silicomolybdate test. Polymeric additives include poly(allylamine hydrochloride) (PAH), the poly(aminoamide) dendrimer of generation…
The thermal conductance of transfer-printed interfaces is found to be surprisingly high, only a factor of 2–10 smaller than the thermal conductance of interfaces formed by physical vapor deposition. These results have practical importance for the thermal management of electronic devices assembled by transfer-printing…
Abstract This paper reports both experimental and theoretical results of the role of surface modification on the oxygen reduction reaction in low‐temperature solid oxide fuel cells (LT‐SOFC). Epitaxial ultrathin films of yttria‐doped ceria (YDC) cathode interlayers (<10–130 nm) are grown by pulsed laser deposition…