Broadening the Scope of Functional Groups Accessible in Aliphatic Polycarbonates by the Introduction of RAFT Initiating Sites
peer reviewed
Materials Literature
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Theoretical Model of Yb$^{3 + }$-Er$^{3 + }$-Tm$^{3 + }$-Codoped System for White Light Generation
We present a theoretical model of Yb3+-Er3+-Tm3+-co-doped system for white light generation. The energy level, electron transition process and numerical model are proposed to calculate fluorescence intensity of the system pumped by 980 nm laser. The numerical results reveal that our theoretical model is in good agreem…
Characterisation of melt‐processed poly(ethylene terephthalate)/synthetic mica nanocomposite sheet and its biaxial deformation behaviour
Abstract BACKGROUND: Poly(ethylene terephthalate) (PET) is widely used in the packaging industry. In order to enhance the mechanical and barrier properties, nanoscale fillers are added to PET matrices to form nanocomposites. In the work reported here, a melt‐processed PET/synthetic mica nanocomposite sheet was charact…
Synthesis and Characterization of ZnO Nanowire–CdO Composite Nanostructures
ZnO nanowire-CdO composite nanostructures were fabricated by a simple two-step process involving ammonia solution method and thermal evaporation. First, ZnO nanowires (NWs) were grown on Si substrate by aqueous ammonia solution method and then CdO was deposited on these ZnO NWs by thermal evaporation of cadmium chlori…
Second-Order Nonlinear Optical Properties of Trisubstituted Keggin and Wells−Dawson Polyoxometalates: Density Functional Theory Investigation of the Inorganic Donor-Conjugated Bridge−Acceptor Structure
The donor-conjugated bridge-acceptor (D-A) model, as a simple molecular scheme, has been successfully used in the development of second-order organic compound, organometallic compound, and metal complex nonlinear optical (NLO) materials. However, for the totally inorganic molecules, the use of this model is still proh…
Dynamics of internal stresses and scaling of strain recovery in an aging colloidal gel
We monitor the relaxation of internal stresses in a fractal colloidal gel on cessation of flow and find a weak power-law decay, ${\ensuremath{\sigma}}_{i}\ensuremath{\sim}{t}^{\ensuremath{-}\ensuremath{\alpha}}$ over five decades of time where $\ensuremath{\alpha}\ensuremath{\approx}0.07$. The system exhibits physical…
Effect of thallium doping on the thermal conductivity of PbTe single crystals
The thermal conductivity of thallium-doped PbTe single crystals has been measured in the temperature range 80–310 K, and the electronic and lattice (χ ph ) components of their thermal conductivity have been evaluated. The results indicate that thallium doping markedly reduces the lattice thermal conductivity of PbTe s…
Pseudospinodal Mode of Decomposition in Films and Formation of Chessboard-Like Nanostructure
A new decomposition mode, a coherent pseudospinodal decomposition under geometrically confined conditions, is discovered. This mode is associated with a coupling of the decomposition with the displacive crystal lattice rearrangement and results in a gradual separation of compositions of two product phases. We consider…
Fabrication of Core−Shell Structure of M@C (M=Se, Au, Ag2Se) and Transformation to Yolk−Shell Structure by Electron Beam Irradiation or Vacuum Annealing
Selenium @ carbon core−shell spheres have been synthesized via a simple one-step hydrothermal carbonization process using sucrose and sodium selenite as precursors. Metal selenide or noble metal, e.g. Ag 2 Se or Au, can be easily encapsulated into the carbon shell by using the as-prepared Se@C core−shell samples as si…
Bimetallic Nanostructures as Active Raman Markers: Gold‐Nanoparticle Assembly on 1D and 2D Silver Nanostructure Surfaces
It is demonstrated that bimetallic silver-gold anisotropic nanostructures can be easily assembled from various nanoparticle building blocks with well-defined geometries by means of electrostatic interactions. One-dimensional (1D) silver nanowires, two-dimensional (2D) silver nanoplates, and spherical gold nanoparticle…
Direct Synthesis of Solvent-Free Multiwall Carbon Nanotubes/Silica Nonionic Nanofluid Hybrid Material
The solvent-free nonionic nanofluid hybrid material consisting of multiwall carbon nanotubes (MWNTs) and silica nanoparticles is prepared by a facile route. The content of MWNTs/silica nanoparticles is up to 31 wt %. The hybrid material exhibits liquid-like behavior in the absence of solvent at 45 degrees C, which is…
Quantifying the Semiconducting Fraction in Single-Walled Carbon Nanotube Samples through Comparative Atomic Force and Photoluminescence Microscopies
A new method was used to measure the fraction of semiconducting nanotubes in various as-grown or processed single-walled carbon nanotube (SWCNT) samples. SWCNT number densities were compared in images from near-IR photoluminescence (semiconducting species) and AFM (all species) to compute the semiconducting fraction.…
The University of California Center for the Environmental Implications of Nanotechnology
Assessing nanomaterialsfor human health and ecotoxicological impact can be well aided by using high-throughput laboratory methods.
Structure of a trimeric bacterial microcompartment shell protein, EtuB, associated with ethanol utilization inClostridium kluyveri
It has been suggested that ethanol metabolism in the strict anaerobe Clostridium kluyveri occurs within a metabolosome, a subcellular proteinaceous bacterial microcompartment. Two bacterial microcompartment shell proteins [EtuA (ethanol utilization shell protein A) and EtuB] are found encoded on the genome clustered w…
Optically switchable gratings based on azo-dye-doped, polymer-dispersed liquid crystals
We report a holographically fabricated, optically switchable grating using azo-dye-doped, polymer-dispersed liquid crystals (LCs). Our experiments show that upon photoirradiation, the diffraction of the grating was decreased significantly. We believe that this switching behavior is due to two factors--nematic-isotropi…
Nanodiamonds as vehicles for systemic and localized drug delivery
Owing to their exceptional biocompatibility and unique surface properties, nanodiamonds (NDs) are shown to be a progressively promising nanomaterial for drug delivery. In this article, NDs as a platform for a host of biomedical applications are described, with an emphasis on cancer therapy, ranging from systemic modal…
Tailoring the Morphology of Carbon Nanotube Arrays: From Spinnable Forests to Undulating Foams
Directly spinning carbon nanotube (CNT) fibers from vertically aligned CNT arrays is a promising way for the application of CNTs in the field of high-performance materials. However, most of the reported CNT arrays are not spinnable. In this work, by controlling catalyst pretreatment conditions, we demonstrate that the…
Magnetism in Re-based ferrimagnetic double perovskites
We have investigated spin and orbital magnetic moments of the Re 5d ion in the double perovskites A2FeReO6 (A = Ba, Sr, Ca) by X-ray magnetic circular dichroism (XMCD) at the Re L(2,3) edges. In these ferrimagnetic compounds an unusually large negative spin and positive orbital magnetic moment at the Re atoms was dete…
Domain walls, canted states and stripe width variation in ultrathin magnetic films with perpendicular anisotropy
Stripe width variation in ultrathin magnetic films is a well known phenomenon still not well understood. We analyze this problem considering a 2D Heisenberg model with ferromagnetic exchange interactions, dipolar interactions and perpendicular anisotropy, relevant e.g. in Fe/Cu(001) films. By extending a classic resul…
Existence of an upper limit on the density of excitons in carbon nanotubes by diffusion-limited exciton-exciton annihilation: Experiment and theory
Through an investigation of photoemission properties of highly photoexcited single-walled carbon nanotubes, we demonstrate that there is an upper limit on the achievable excitonic density. As the intensity of optical excitation increases, all photoluminescence emission peaks arising from different chirality single-wal…