Materials Literature
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Superconducting planar terahertz (THz) metamaterials (MMs), with unit cells of different sizes, are fabricated on 200 nm-thick niobium nitride (NbN) films deposited on MgO substrates. They are characterized using THz time domain spectroscopy over a temperature range from 8.1 K to 300 K, crossing the critical temperatu…
We report a thermally-induced increase of electrical conductivity of polymer/multiwalled carbon nanotube (MWCNT) composites using Diels-Alder-adduct-modified MWCNTs as additives. Thermal treatments of the composites induce the defunctionalization of the modified MWCNTs through retro-DA reaction, consequently to recove…
We present extensive simulations on the TIP4P∕2005 water model showing significantly enhanced small-angle scattering (SAS) in the supercooled regime. The SAS is related to the presence of a Widom line (T(W)) characterized by maxima in thermodynamic response functions and Ornstein-Zernike correlation length. Recent exp…
The modified effective medium approximation model proposed by Minnich and Chen [Appl. Phys. Lett. 91, 073105 (2007)] for the thermal conductivity of nanocomposites is extended for spheroidal inclusions. It is shown that the dependence of the thermal conductivity of nanocomposites on the shape and size of particle incl…
To achieve the applications of graphene, the modulation of its electrical properties is of great significance. The element doping might give a promising approach to produce fascinating properties of graphene. Herein we report a facile chemical doping method to obtain nitrogen-doped (N-doped) few-layer graphene sheets…
Heterostructured thin films consisting of distinct layers of the Prussian blue analogues Rb a Co b [Fe(CN) 6 ] c · m H 2 O (CoFe PBA) and Rb j M k [Cr(CN) 6 ] l · n H 2 O (MCr PBA, where M = Ni or Co) have been fabricated, and their photomagnetic properties have been investigated. The CoFe PBA is known to be photoacti…
In this letter, we analyze the direct and converse effect in laminate composites of magnetostrictive and piezoelectric materials. Our results deterministically show that direct magnetoelectric (ME) effect is maximized at antiresonance frequency while the converse ME effect is maximized at resonance frequency of the la…
LiNbO(3)-type MnMO(3) (M = Ti, Sn) were synthesized under high pressure and temperature; their structures and magnetic, dielectric, and thermal properties were investigated; and their relationships were discussed. Optical second harmonic generation and synchrotron powder X-ray diffraction measurements revealed that bo…
We present the development of a new imaging technique for the early diagnosis of hepatocellular carcinoma that utilizes surface-modified gold nanoparticles in combination with X-ray imaging. Tissues labeled with these electron-dense particles show enhanced X-ray scattering over normal tissues, distinguishing cells con…
The quantum states in metal clusters bunch into supershells with associated orbitals having shapes resembling those in atoms, giving rise to the concept that selected clusters could mimic the characteristics of atoms and be classified as superatoms. Unlike atoms, the superatom orbitals span over multiple atoms and the…
Accumulating evidence suggests that the success of some anticancer therapies not only relies on their direct cytotoxicity on tumor cells but also on their ability to promote anticancer immune responses. However, immunosuppressive cells such as Myeloid Derived Suppressor Cells (MDSC) that are generated during tumor pro…
Atomically resolved structural and electronic properties of FeTe${}_{1\ensuremath{-}x}$Se${}_{x}$ ($x$ $=$ 0 and 0.45) have been studied with scanning tunneling microscopy/spectroscopy (STM/STS). In contrast to the extreme flatness of the Te-terminated FeTe surface, nanoscale chemical phase separation between Te and S…
Block copolymer cross-linked nanoassemblies (CNAs) were developed as stable supramolecular templates for particulate drug delivery. Poly(ethylene glycol)-poly(aspartate) [PEG-p(Asp)] block copolymers, consisting of PEG (5 or 12 kDa) and Asp (5, 14, 25, 33, and 37 repeating units), were used as scaffolds and grafts in…
A giant magnetocaloric effect has been observed in NdMn2Ge0.4Si1.6 associated with the first-order magnetic phase transition from antiferromagnetism to ferromagnetism around TC=36K. The magnetic entropy change –ΔSM and adiabatic temperature change ΔTad have been determined from magnetization and specific heat measurem…
A divanadium-substituted phosphotungstate, [γ-PW(10)O(38)V(2)(μ-OH)(2)](3-) (I), showed the highest catalytic activity for the H(2)O(2)-based epoxidation of allyl acetate among vanadium and tungsten complexes with a turnover number of 210. In the presence of I, various kinds of electron-deficient alkenes with acetate,…
C-Schalen: Eine einfache Synthese mit Dopamin als Kohlenstoffquelle liefert hohle Kohlenstoffkugeln und Au@Kohlenstoff-Nanokomposite mit Ei-artiger Struktur (siehe Bild). Die Einheitlichkeit der Dopaminbeschichtungen und ihre hohe Kohlenstoffausbeute hat Produkte mit hoher struktureller Integrität zur Folge. Die Au@C-…
A star in the making: Gold nano-hexapods with controlled arm lengths were synthesized by selective growth on the vertices of octahedral Au seeds. Depending on the arm length, their surface plasmon resonance peaks shifted from the visible to the near-infrared region (see picture), which could be readily controlled by v…
Tunable and highly reproducible metal–insulator transitions have been observed in bilayer graphene upon thermal annealing at 400 K under high vacuum conditions. Before annealing, the sample is metallic in the whole temperature regime of study. Upon annealing, the conductivity changes from metallic to that of an insula…
We uncover the interlayer shear mode of multi-layer graphene samples, ranging from bilayer-graphene (BLG) to bulk graphite, and show that the corresponding Raman peak measures the interlayer coupling. This peak scales from~43cm-1 in bulk graphite to~31cm-1 in BLG. Its low energy makes it a probe of near-Dirac point qu…
Low-energy ion beam modification was proposed to create graphene on the top of the insulated diamond-like carbon films. In such low-temperature fabrication process the surface of the amorphous carbon could crystallize to graphene as a result of point defect creation and enhanced diffusion caused by the ion bombardment…