Materials Literature
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Three polar noncentrosymmetric (NCS) oxide materials, A(3)V(5)O(14) (A = K(+), Rb(+), or Tl(+)), have been synthesized by hydrothermal and conventional solid state techniques. Their crystal structures and functional properties (second-harmonic generation, piezoelectricity, and polarization) have been determined. The i…
Polypeptide hydrogels are combined with light-sensitive gold nanorods (NRs) to produce NIR-triggered hydrogel dissociation (see image). This transition is used for molecule delivery in a triggered or stepwise manner.
We investigate the energetics of forming heteronanotubes, which are combinations of pure carbon nanotube (CNT) segments and boron-nitride nanotube (BNNT) segments. Our density functional theory calculations predict that the adverse impacts of heterojunctions on the nanotube stability can be minimized if the CNT and/or…
A simple protocol to create nanofibers and -rings through a rational self-assembly approach is described. Whereas the melamine-oligo(p-phenylenevinylene) conjugate 1a self-aggregates to form ill-defined nanostructures, conjugate 1b, which possesses an amide group as an additional interactive site, self-aggregates to f…
The interaction of Pt with CeO(2) layers was investigated by using photoelectron spectroscopy. The 30 nm thick Pt doped CeO(2) layers were deposited simultaneously by rf-magnetron sputtering on a Si(001) substrate, multiwall carbon nanotubes (CNTs) supported by a carbon diffusion layer of a polymer membrane fuel cell…
Abstract Using first‐principles density functional calculations, a systematic study of the elastic properties for all known superconducting MAX phases (Nb2SC, Nb2SnC, Nb2AsC, Nb2InC, Mo2GaC, and Ti2InC) was performed. As a result, the optimized lattice parameters, independent elastic constants, indicators of elastic a…
The aim of this work was to develop a novel method of preparation of loaded nanosize capsules based on liquid core encapsulation by biocompatible polyelectrolyte (PE) multilayer adsorption, with or without pegylated outermost layer. Using AOT (docusate sodium salt) as emulsifier, we obtained cores, stabilized by an AO…
Currently available crosslinking methods for electrospun collagen nanofibers do not preserve the fibrous architecture over prolonged periods of time. In addition, electrospinning of collagen often involves solvents that lead to extensive protein denaturation. In this study, we demonstrate the advantage of acetic acid…
Ultrafast spin probe: A short-lived transient species of light-excited [Fe(bpy)3]2+ (bpy=2,2′-bipyridine) shows geometry variations that correspond to excitation to a high-spin state, in which the spin momentum of FeII has now been directly determined to be S=2 by spin-sensitive ultrafast X-ray emission spectroscopy.
An approach to the design and fabrication of mechanized mesoporous silica nanoparticles is demonstrated at the proof of principle level. It relies on the reductive cleavage of disulfide bonds within an integrated nanosystem, wherein surface-bound rotaxanes incorporate disulfide bonds in their stalks, which are encircl…
We develop a generalized framework based on a Green's function formalism to calculate the efficiency of multiexciton gen-eration in nanocrystal quantum dots. The direct/indirect absorption and coherent/incoherent impact ionization mechanisms, often used to describe multiexciton generation in nanocrystals, are reviewed…
Using a multi-resolution technique, we analyze large in-plane fracture fronts moving slowly between two sintered Plexiglas plates. We find that the roughness of the front exhibits two distinct regimes separated by a crossover length scale $δ^*$. Below $δ^*$, we observe a multi-affine regime and the measured roughness…
Monte Carlo simulations at constant pressure are performed to study coexistence and interfacial properties of the liquid-solid transition in hard spheres and in colloid-polymer mixtures. The latter system is described as a one-component Asakura-Oosawa (AO) model where the polymer's degrees of freedom are incorporated…
We investigate magnetically induced ferroelectricity in ${\text{Cu}}_{2}{\text{MnSnS}}_{4}$ by means of Landau theory of phase transitions and of ab initio density-functional theory. As expected from the Landau approach, ab initio calculations show that a nonzero ferroelectric polarization $\mathbit{P}$ along the $y$…
We report a type of device that combines vertical arrays of one-dimensional (1D) pillar-superlattice (PSL) structures with 2D graphene sheets to yield a class of light emitting diode (LED) with interesting mechanical, optical, and electrical characteristics. In this application, graphene sheets coated with very thin m…
We report a novel class of amphiphilic conjugated block copolymers composed of poly(3-octylthiophene) and poly(ethylene oxide) (POT-b-PEO) that exhibit highly tunable photoluminescence colors spanning from blue to red. POT-b-PEO self-assembles into various well-defined core/shell-type nanostructures as a result of its…
Doxorubicin (Dox) was conjugated onto a biodegradable block copolymer methoxy-poly(ethylene glycol)-block-poly(lactide-co-2,2-dihydroxymethylpropylene carbonate (mPEG-b-P(LA-co-DHP)) via a carbamate linkage and an acid-labile hydrazone linkage, respectively. Mutifunctional mixed micelles consisting of Dox-containing c…
The singlet-triplet relaxation in nanowire-based quantum dots induced by confined phonons is investigated theoretically. Due to the quasi-one-dimensional nature of the confined phonons, the singlet-triplet relaxation rates exhibit multi-peaks as function of magnetic field and the relaxation rate between the singlet an…
The molecular structure of the wetting layer of ice on Pt(111) is resolved using scanning tunneling microscopy (STM). Two structures observed previously by diffraction techniques are imaged for coverages at or close to completion of the wetting layer. At 140K only a sqrt(37) x sqrt(37) R25.3° superstructure can be est…
Using optical spectroscopy, we investigated the electrodynamic properties of $\text{Nb}:{\text{SrTiO}}_{3}/{\text{SrTiO}}_{3}$ superlattices. In these superlattices, a large enhancement of the Seebeck coefficient $(S)$ has been reported with decreasing $\text{Nb}:{\text{SrTiO}}_{3}$ layer thickness [H. Ohta et al., Na…