Liquid Interfacial Systems: Oscillations and Instability
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Electrostatic Layer-by-Layer Self-Assembly of Poly(carboxybetaine)s: Role of Zwitterions in Film Growth
We report on self-assembly of a weak zwitterionic polymer poly(carboxybetaine), PCB5 within a polyelectrolyte multilayer film. Multilayer growth and ionization of carboxylic groups are monitored in situ using ATR-FTIR. Deposition of PCB5 within the film is contrasted for two pH regimes: (1) at slightly acidic pH value…
Polymer Chain Dynamics in a Random Environment: Heterogeneous Mobilities
We present a neutron scattering investigation on a miscible blend of two polymers with greatly different glass-transition temperatures Tg. Under such conditions, the nearly frozen high-Tg component imposes a random environment on the mobile chain. The results demand the consideration of a distribution of heterogeneous…
Using a cut–paste method to prepare a carbon nanotube fur electrode
We describe and realize an aligned carbon nanotube array based 'carbon nanotube fur (CNTF)' electrode. We removed an 800 µm long aligned carbon nanotube array from the silica substrate, and then pasted the array on a nickel foam current collector to obtain a CNTF electrode. CNTF's characteristics and electrochemical p…
A Simple Way of Synthesizing Single-Crystalline Semiconducting Copper Sulfide Nanorods by Using Ultrasonication during Template-Assisted Electrodeposition
We demonstrate here the utilization of ultrasonication during template-assisted electrodeposition to synthesize high quality one-dimensional nanostructures. Copper sulfide nanorods were synthesized “sonoelectrochemically” to achieve single-crystal nanorods with predominantly single stoichiometric composition (1.0:1.0…
Fabrication of “Tadpole”-like Magnetite/Multiwalled Carbon Nanotube Heterojunctions and Their Self-Assembly under External Magnetic Field
Novel "tadpole"-like Fe3O4/multiwalled carbon nanotube (MWCNT) heterojunctions were successfully synthesized by position-selectively attaching Fe3O4 sphere on the tips of MWCNTs through a straightforward and effective polyol-medium solvothermal method. Transmission and scanning electron microscopy (TEM and SEM) and X-…
Electrochemical Growth and Control of ZnO Dendritic Structures
The dendritic crystal growth patterns that typically grow along principal crystallographic axes and have the hierarchical structure have been attracting much attention from scientists for several centuries. Here we report that the ZnO dendritic nanostructure as a new member of the ZnO family could be successfully prep…
Spontaneous Stretching of DNA in a Two-Dimensional Nanoslit
DNA molecules in silicon dioxide-glass fluidic nanoslits spontaneously extend at the lateral sidewalls of the slit. The nanoslit geometry, however, physically confines polymer molecules to two spatial dimensions; further reduction in configurational entropy resulting in axially stretched molecules arises spontaneously…
Chemical Properties of Small Au Clusters: An Analysis of the Local Site Reactivity
The chemical properties of small gold clusters Au n with n up to 10 atoms were investigated using density functional theory (DFT). These clusters have planar structures, and we analyzed the effects of the planarity on the chemistry of the clusters. Using atomic hydrogen as a chemical probe, we found a strong site depe…
Stable Biomimetic Superhydrophobicity and Magnetization Film with Cu-Ferrite Nanorods
We describe a simple and inexpensive method to produce lotus leaf-like Cu-ferrite films on copper alloy engineering materials fabricated via a sol−gel process and chemical modification. The films show stable superhydrophobicity and magnetization, even in many corrosive solutions, such as acidic or basic solutions, and…
Hierarchical Morphologies Formed by ABC Star-Shaped Terpolymers
Three types of hierarchical morphologies, i.e., cylinders-in-lamella, lamellae-in-cylinder, and lamellae-in-sphere structures, have been identified for ABC star-shaped terpolymers by transmission electron microscopy and small-angle X-ray scattering. The samples are composed of polyisoprene (I), polystyrene (S), and po…
Synthesis and Functionalization of Germanium Triphenylcorrolate: The First Example of a Partially Brominated Corrole
Abstract Ge complexes of 5,10,15‐triphenylcorrole were prepared in refluxing dry DMF using GeCl 4 as the source of Ge. Chromatographic separation of the crude reaction mixture afforded the μ‐oxo dimer 1 and the methoxy derivative 2a . The corresponding chloride 2b can be obtained by treatment of 1 or 2a with HCl. The…
Theoretical Study on the Second Hyperpolarizabilities of Phenalenyl Radical Systems Involving Acetylene and Vinylene Linkers: Diradical Character and Spin Multiplicity Dependences
We have investigated the static second hyperpolarizabilities (gamma) of the singlet diradical systems with intermediate diradical character involving phenalenyl radicals connected by acetylene and vinylene pi-conjugated linkers, 1 and 2, using the hybrid density functional theory. For comparison, we have also examined…
Reversible ferromagnetic switching in ZnO:(Co, Mn) powders
We report here on the magnetic properties of ZnO:Mn- and ZnO:Co-doped nanoparticles. We have found that the ferromagnetism of ZnO:Mn can be switched on and off by consecutive low-temperature annealings in ${\mathrm{O}}_{2}$ and ${\mathrm{N}}_{2}$, respectively, while the opposite phenomenology was observed for ZnO:Co.…
Polarizing beam splitter of a deep-etched fused-silica grating
We described a highly efficient polarizing beam splitter (PBS) of a deep-etched binary-phase fused-silica grating, where TE- and TM-polarized waves are mainly diffracted in the -1st and 0th orders, respectively. To achieve a high extinction ratio and diffraction efficiency, the grating depth and period are optimized b…
Tuning the Release Rate of Acidic Degradation Products through Macromolecular Design of Caprolactone-Based Copolymers
Macromolecular engineering is presented as a tool to control the degradation rate and release rate of acidic degradation products from biomedical polyester ethers. Three different caprolactone/1,5-dioxepan-2-one (CL/DXO) copolymers were synthesized: DXO/CL/DXO triblock, CL/DXO multiblock, and random cross-linked CL/DX…
On the study of collective dynamics in supercooled liquids through the statistics of the isoconfigurational ensemble
The use of the isoconfigurational ensemble to explore structure-dynamic correlations in supercooled liquids is examined. The statistical error of the dynamic propensity and its spatial distribution are determined. The authors present the spatial distribution of the particle non-Gaussian parameter as a measure of the i…
Counterions Release from Electrostatic Complexes of Polyelectrolytes and Proteins of Opposite Charge: A Direct Measurement
Though often considered as one of the main driving processes of the complexation of species of opposite charges, the release of counterions has never been experimentally directly measured on polyelectrolyte/proteins complexes. We present here the first structural determination of such a release by small angle neutron…
Raman spectroscopy of optical phonons confined in semiconductor quantum dots and nanocrystals
Abstract This paper gives an overview of theoretical and experimental results on Raman‐active optical phonon modes confined in nearly spherical nanocrystals (NCs) of polar semiconductor materials with cubic crystal structure. A systematic consideration of the effect of reduced dimensionality on both electrons and phon…
Synthesis and Reactions of 20 π-Electron β-Tetrakis(trifluoromethyl)-meso-tetraphenylporphyrins
The 20 π-electron nonaromatic isophlorin 2 had been successfully isolated and thoroughly characterized and was formed by reduction of Cu(II) β-tetrakis(trifluoromethyl)- meso -tetraphenylporphyrin ( Cu1 ) with activated zinc powder. However, the reaction utilizing Ni(II) β-tetrakis(trifluoromethyl)- meso -tetraphenylp…