Materials Literature
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Phonons scatter and travel ballistically in systems smaller than the phonon mean free path. At larger lengths, the transport is instead predominantly diffusive. We employ molecular dynamics simulations to describe the length dependence of the thermal conductivity. The simulations show that the interfacial thermal resi…
About 75% of extant sponge species use dissolved silicon (DSi) to build a siliceous skeleton. We show that silicon (Si) uptake by sublittoral Axinella demosponges follows an enzymatic kinetics. Interestingly, maximum uptake efficiency occurs at experimental DSi concentrations two orders of magnitude higher than those…
Amine for improvement: A non-injection approach using an amine as a reducing agent is developed to produce spherical EuSe nanocrystals (NCs) exhibiting blue emission (peaking at 403 nm with 2.8 % quantum yield) and room-temperature magnetic coercivity of 80.2 Oe (see scheme). The NC morphologies can be controlled easi…
A novel template was designed for photocontrollable drug release. Multiple functional groups can be loaded and unloaded onto the template via UV irradiation. Importantly, the template can inhibit loaded drug being uptaken by normal cells. However, upon the irradiation of UV light to the target site, such as tumor tiss…
Rare-earth upconversion nanobarcodes (UPNBs) have been developed for multiplexed signaling. There is no optical cross talk between the upconversion optical code and any reporter dyes. The midrange IR radiation used to excite the upconversion materials does not excite dyes that absorb in the visible and UV region and,…
Pattern array of CVD-grown single layer graphene (SLG) is demonstrated by using micro-patterned PDMS stamp. These ultrathin SLG electrodes can use as the source and drain for organic field effect transistors. The devices have high hole mobilities exceeding 10 cm2/Vs, high on-off current ratios larger than 107 and a lo…
The electronic structure of Ce2 is studied in a valence bond model with two 4f electrons localized at two cerium sites. It is shown that the low-lying energy spectrum of the simplest cerium chemical bond is determined by peculiarities of the occupied 4f states. The model allows for an analytical solution which is disc…
The formation of a novel drug-delivery carrier for the controlled release of plasmid DNA that comprises layer-by-layer polymer capsules subcompartmentalized with pH-sensitive nanometer-sized polymersomes is reported. The amphiphilic diblock copolymer poly(oligoethylene glycol methacrylate)-block-poly(2-(diisopropylami…
Topological insulators represent a new state of quantum matter attractive to both fundamental physics and technological applications such as spintronics and quantum information processing. In a topological insulator, the bulk energy gap is traversed by spin-momentum locked surface states forming an odd number of surfa…
Native cellulose nanofibers are functionalized using luminescent metal nanoclusters to form a novel type of functional nanocellulose/nanocluster composite. Previously, various types of cellulose fibers have been functionalized with large, non-luminescent metal nanoparticles. Here, mechanically strong native cellulose…
Differences in carbon assimilation pathways and reducing power requirements among organisms are likely to affect the role of the storage polymer poly-3-hydroxybutyrate (PHB). Previous researchers have demonstrated that PHB functions as a sole growth substrate in aerobic cultures enriched on acetate during periods of c…
The electronic structures of tetragonally distorted half-Heuselr compound LaPtBi in the C1b structure are investigated in the framework of density functional theory using the full potential linearized augmented plane with local spin density approximation method. The calculation results show that both the band structur…
Phonon spectra of solid substitutional solutions with finite concentrations of impurities were analyzed on the microscopic level. The local phonon densities of impurity atoms were calculated, in particular the formation of quasilocal vibrations and their evolution with increasing of the concentration of impurities wer…
A comparative study by FP-LAPW calculations based on DFT within LDA, PBE-GGA, EV$_{ex}$-PW$_{co}$-GGA, and EV$_{ex}$-GGA-LDA$_{co}$ schemes is introduced for the structural and electronic properties of ScN in RS, ZB, WZ, and CsCl phases. According to all approximations used in this work, the RS phase is the stable gro…
Hydrophobic self-assembled monolayers (SAMs) with alkyl chains of various lengths were inserted between CVD-grown graphene layers and their SiO2 substrates (figure). As the SAM alkyl chain length increased, substrate-induced doping was suppressed by the ordered close-packed structure of SAMs with long alkyl chains. Ac…
Hexagonal graphene flakes: Equiangular hexagon-shaped graphene domains are synthesized by methane chemical vapor deposition on copper surface in a controlled manner. These graphene domains possess either armchair or zigzag edge, and are formed via nucleation and growth mechanism. Left image is a typical AFM image of o…
Spider silks with periodic spindle-knots are skillful at collecting water from the foggy air. Under controlled fabrication conditions, a series of bioinspired artificial spider silks (BAS) with different sized spindle-knots are realized. Furthermore, the water collection ability of these BASs is investigated. The stud…
Highly stretchable 2D buckled polypyrrole film is prepared by a simple electropolymerization method on pre-strained Au-coated elastic substrate. This electrode retains its electrochemical properties in Mg batteries after 2000 stretching cycles with 30% strain applied. A combination of exceptional stretchability and el…
The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recent…
The local atomic structure of graphene oxide has been probed using synchrotron radiations. Detailed investigations of recently proposed simplistic model of graphene oxide using x-ray absorption near edge spectroscopy have been performed. X-ray diffraction measurements and calculations indicate loss of coherence betwee…