Materials Literature
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A formal [2 + 2] cycloaddition-cycloreversion (CA-CR) between N,N'-dicyanoquinone diimides (DCNQIs) and electron-rich alkynes was explored, providing a new class of π-conjugated donor-acceptor chromophores. These DCNQI adducts exist in the solid state as single diastereoisomers, but as two interconverting diastereoiso…
We demonstrated an efficient sequential two-step near-infrared (NIR) quantum splitting (QS) in a Ho3+ singly doped β-NaYF4. An incident high-energy ultraviolet (UV)-to-visible photon in the wavelength range of 300−560 nm, which enables the Ho3+:5F4,5S2 states excited, could be efficiently split into two NIR photons at…
Single-crystalline CaFe${}_{2}$As${}_{2}$ and (Ca${}_{1\ensuremath{-}x}$Na${}_{x}$)Fe${}_{2}$As${}_{2}$ polycrystals (0 $x$ 0.66) are synthesized and characterized using structural, magnetic, electronic transport, and heat capacity measurements. These measurements show that the structural/magnetic phase transition in…
Abstract The effectiveness of compatibilizers in enhancing the dispersion of polypropylene (PP) at various molecular weights in recycled polyethylene terephthalate (RPET) was elucidated. The idea of incorporating PP of different molecular weights evolved from the intention of simultaneously recycling the PET bottles t…
This work demonstrates a polarization-independent electrically tunable Fabry-Pérot (FP) filter that is based on polymer-stabilized blue phase liquid crystals (PSBPLCs). An external vertical electric field can be applied to modulate the effective refractive index of the PSBPLCs along the optical axis. Therefore, the wa…
Abstract Highly conducting polypyrrole (PPY) films, doped with various anions [pTS − , ClO 4 − , and NO 3 − and mixed electrolyte system (pTS − + ClO 4 − )], have been electrochemically synthesized in aqueous solution at ∼275 K in an inert atmosphere. PPY exhibits metallic order dc conductivity at room temperature and…
Nanocrystals and nanoclusters of the room-temperature magnetic spinel CuCr(2)S(4) have been synthesized using a facile solution-based method. The synthesis involves hot injection of an excess of 1-dodecanethiol (1-DDT) into a boiling coordinating solvent containing CuCl(2) and CrCl(3)·6H(2)O. Using octadecylamine (ODA…
While NMR measurements of nuclear energy spectra are routinely used to characterize the static properties of quantum magnets, the dynamical information locked in NMR $1/{T}_{1}$ relaxation rates remains notoriously difficult to interpret. The difficulty arises from the fact that information about all possible low-ener…
In this study, the surface chemical structure and molecular conformation of one kind of PI alignment film achieving vertical alignment were investigated by XPS, ATR-FTIR, and polarized ATR-FTIR, and the LC alignment on PI film was studied by transmission polarized FTIR. It was found that some chemical groups, such as…
Under 980 nm excitation, multiple ultraviolet and visible upconversion luminescence from Ho3+ and Eu3+ ions were observed in Yb3+/Ho3+/Eu3+ tri-doped NaYF4 microcrystals (MCs). The high-energy states (5H3-7, 5L6, 5D3 and 5D2) of Eu3+ ions could be efficiently populated by two-step energy transfer (ET) processes of Yb…
Abstract Ring‐opening polymerization of D,L ‐lactide was stereoselectively achieved using newly designed aluminum alkoxide complexes as initiators. These half‐SALEN aluminum complexes bearing tridentate nonchiral Schiff‐base ligands are racemates, which provide chirality in the aluminum centers, efficiently afforded a…
This article deals with the small-scale effect on the nonlinear free vibration of orthotropic single-layered graphene sheets using the nonlocal elasticity plate theory. The formulations are based on the Mindlin plate theory, and von Karman-type nonlinearity is considered in strain displacement relations. Virtual work…
The use of a method of studying wetting both for the research of fundamental problems of surface physicochemistry, such as obtaining information on the structure and properties of the interface and the processes that occur with its participation, and for technological applications related to the preparation of new mat…
A synthetic approach has been devised to convert conventional Stöber silica (SiO 2 ) spheres into a new type of porous structural platform for supporting multicomponent catalysts. With this approach, we have first prepared zinc-doped SiO 2 (Zn-SiO 2 ) hollow spheres, on which zinc oxide (ZnO) phase and ruthenium (Ru)…
Gelatin-based polyvinyl alcohol (PVA) films were prepared (using a casting process) by mixing aqueous solutions of gelatin and PVA in different ratios. Monomer 1, 4-butanediol diacrylate (BDDA) was dissolved in methanol. Films containing 95% gelatin + 5% PVA were soaked in 3% BDDA monomer (w/w). These films were then…
Abstract Polymer/layered‐silicate hybrids nanocomposites have attracted strong interest in today's materials research, as it is possible to achieve impressive enhancements of material properties compared to the pure polymers. In the present investigation, at first, Cloisite Na + was modified by protonated form of natu…
Novel electrochromic polynorbornenes poly(NBPYTPAM) and poly(HNBPYTPAM), containing electroactive chromophores, were prepared via ring-opening metathesis polymerization (ROMP) from a new norbornene derivative (NBPYTPAM) using Grubbs’ catalyst and followed by hydrogen reduction. The glass transition temperatures ( T g…
Temperature- and pressure-dependent electrical resistivity [($\ensuremath{\rho}T$,$P$)] studies have been performed on BaMn${}_{2}$As${}_{2}$ single crystal in the 4.2--300 K range up to 8.2 GPa in order to investigate the evolution of its ground state properties. \ensuremath{\rho}($T$) data show negative coefficients…
Abstract Two novel primary antioxidants with dendritic structure and hindered phenolic groups were synthesized using 3‐(3,5‐diter‐butyl‐4‐hydroxyphenyl) propionic acid as raw material and dendritic poly(amidoamine) (PAMAM) as linker in chloroform. The antioxidant activities of the dendritic antioxidants were evaluated…
We report the imaging, mass spectrum, and dynamical behavior of adatoms and small clusters observed on the surface facets of size-selected, truncated octahedral gold clusters, Au(N) (N = 923 ± 23), via aberration-corrected scanning transmission electron microscopy. Our quantitative atom counting measurements show that…