Materials Literature
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A facile approach to prepare CdSe/ZnS quantum dot-encapsulated chitosan hybrid nanospheres (CS-QD) is developed by utilizing ethanol-aided counterion complexation in aqueous solution. The obtained CS-QD hybrid nanospheres have not only the loading space provided by the chitosan spherical matrix for loading multiply QD…
Solid lipid nanoparticles (SLNs) are submicrometer (1-1000 nm) colloidal carriers developed in the past decade as an alternative system to traditional carriers (emulsions, liposomes, and polymeric nanoparticles) for intravenous applications. Because of their potential as drug carriers, there is much interest in unders…
In this report, we investigate the electrical and optical properties of thin conducting films of SWNTs after treatment with small molecule and polymeric amines. Among those tested, we find hydrazine to be the most effective n-type dopant. We use absorbance, Raman, X-ray photoelectron, and nuclear magnetic resonance sp…
Continued reduction in characteristic dimensions in nanosystems has given rise to increasing importance of material interfaces on the overall system performance. With regard to thermal transport, this increases the need for a better fundamental understanding of the processes affecting interfacial thermal transport, as…
Spin chains have been proposed as quantum wires in many quantum-information processing architectures. Coherent transmission of quantum information in spin chains over short distances is enabled by their internal dynamics, which drives the transport of single-spin excitations in perfectly polarized chains. Given the pr…
The resolution of lenses is normally limited by the wave nature of light. Imaging with perfect resolution was believed to rely on negative refraction, but here we present experimental evidence for subwavelength imaging with positive refraction.
Abstract A new approach on usage of S ‐1‐dodecyl‐ S ′‐(α,α′‐dimethyl‐α″‐acetic acid)trithiocarbonate (DDAT)‐covalently functionalized graphene oxide (GO) as reversible addition fragmentation chain transfer (RAFT) agent for growing of poly( N ‐vinylcarbazole) (PVK) directly from the surface of GO was described. The PVK…
Nanotechnology as well as advanced microscopy can play a fundamental role in understanding biological mechanisms. Here we present a study that combines a new type of nanomaterial with a new type of microscopy and highlights the potential for gathering novel information about cell membrane penetration and cytosol local…
The variations of in- and inter-plane London penetration depths, $\ensuremath{\Delta}\ensuremath{\lambda}(T)$, were measured using a tunnel diode resonator in single crystals of the intrinsic pnictide superconductor LiFeAs. This compound appears to be in the clean limit with a residual resistivity of 4 ($T\ensuremath{…
We present the synthesis of Cd(3)As(2) colloidal quantum dots luminescent from 530 to 2000 nm. Previous reports on quantum dots emitting in the infrared are primarily limited to the lead chalcogenides and indium arsenide. This work expands the availability of high quality infrared emitters.
Dual action: Trackable multifunctional dendritic scaffolds with high internal loading capacity were synthesized based on a PEG core. Orthogonal functionalization of chain-end and internal groups allowed the dendrimers to be both labeled and loaded with releasable dyes for simultaneous monitoring of the dendritic carri…
The poor adhesion of gold nanoparticles (NPs) to glass has been a known obstacle to studies and applications of NP-based systems, such as glass/Au-NP optical devices. Here we present a simple scheme for obtaining stable localized surface plasmon resonance (LSPR) transducers based on Au NP films immobilized on silanize…
Interfaces play an important role in crystalline plasticity as they affect strength and often serve as obstacles to dislocation motion. Here we investigate effects of grain and nanotwin boundaries on uniaxial strength of 500 nm diameter Cu nanopillars fabricated by e-beam lithography and electroplating. Uniaxial compr…
We have performed molecular dynamics simulations to explore the influence of confinement on the glass-transition temperature T g for supported atactic-polystyrene (aPS) thin films of different thickness (1−10 nm) and different strengths of attraction to the substrate (0.1−3.0 kcal/mol). The aPS films have been equilib…
By means of first-principles calculations, we studied in detail the structural, elastic, and electronic properties of the tetragonal CaBe${}_{2}$Ge${}_{2}$-type 5.2 K superconductor SrPt${}_{2}$As${}_{2}$ in comparison with two hypothetical SrPt${}_{2}$As${}_{2}$ polymorphs with ThCr${}_{2}$Si${}_{2}$-type structures,…
A self-consistent, mean-field model of charge-carrier injection and unipolar transport in an organic semiconductor diode is developed utilizing the effective transport energy concept and taking into account a realistic density-of-states distribution as well as the presence of trap states in an organic material. The co…
Magnetic properties of Fe, Co, and Ni at finite temperatures have been investigated on the basis of the first-principles dynamical CPA (Coherent Potential Approximation) combined with the LDA (Local Density Approximation) + $U$ Hamiltonian in the Tight-Binding Linear Muffintin Orbital (TB-LMTO) representation. The Ham…
The effects of the addition of poly(D-lactide) (PDLA) on the crystallization behavior of poly(L-lactide)(PLLA) were investigated by means of differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction(XRD). When the blends were cooled from different temperatures (250, 240, and 190 °C) at the ra…
The structure and interface characteristics of (${\mathrm{LaVO}}_{3}$)${}_{6m}$(${\mathrm{SrVO}}_{3}$)${}_{m}$ superlattices deposited on a (100)-SrTiO${}_{3}$ substrate were studied using transmission electron microscopy (TEM). Cross-section TEM studies revealed that both ${\mathrm{LaVO}}_{3}$ (LVO) and ${\mathrm{SrV…
The intrinsic values of the carriers mobility and density of the graphene layers inside graphite, the well-known structure built on these layers in the Bernal stacking configuration, are not well known mainly because most of the research was done in rather bulk samples where lattice defects hide their intrinsic values…