Materials Literature
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Abstract Chitosan (Ch) and N ‐carboxymethylchitosan ( N ‐CMCh) films were prepared by the casting method at concentrations of 1% and 2% of polymer, with or without plasticizer: polyethylene glycol (PEG‐400) and glycerol (G), at 15% (w/w). The influence of composition on mechanical properties, water vapour transmission…
Dipole moments μ, static averaged polarizabilities ⟨αrang;, and hyperpolarizabilities βvec of thiazole, benzothiazole, and their dipolar substituted derivatives have been computed by means of B3LYP and MP2 theories with the Pol basis set. Basis set effects have been considered for thiazole, benzothiazole, and doubly s…
We describe a novel colour-tunable light-emitting diode whose operation is based on direct band-gap emission from coupled configurations of InP quantum dots and quantum wells embedded in GaP. The control of the emission colour stems from a marked difference in the current dependence of intensities of two different emi…
Numerous commercial and military applications exist for guest–host liquid crystal (LC) devices operating in the near- to mid-IR region. Progress in this area has been hindered by the severe lack of near-IR dyes with good solubility in the LC host, low impact on the inherent order of the LC phase, good thermal and chem…
Abstract Poly(methyl methacrylate) (PMMA)/Titanium oxide (TiO 2 ) composite particles were prepared via in‐situ emulsion polymerization of MMA in the presence of TiO 2 particles. Before polymerization, the TiO 2 particles was modified by the silane coupling agent, which is crucial to ensure that PMMA reacts with TiO 2…
Abstract A new class of organic‐inorganic hybrid polymers with well‐defined structure was prepared by reacting diepoxyhexavinyl polyhedral oligomeric silsesquioxanes (DehvPOSS) with diamines of different chain lengths. The structures and properties of these hybrid polymers were well characterized by FTIR, 29 Si‐NMR, G…
Electron beam-induced deposition (EBID) using organometallic precursors is a promising technique for nanometre-sized fabrication, but the deposits have been mostly limited to carbonaceous materials. In this study, vapours of water and iron pentacarbonyl were mixed with precise control and the mixture used as a precurs…
Abstract To effectively modify the properties of an epoxy, branched oligomers were synthesized from ϵ‐caprolactone (CL) and end‐functionalized to realize network precursors that can be reactively blended with the epoxy. The ring‐opening polymerization (ROP) of the CL in the presence of polyglycerol (PGL) initiator (3.…
Abstract Nano‐CaCO 3 /polypropylene (PP) masterbatch containing above 80 wt % nano‐CaCO 3 was prepared by nano‐CaCO 3 coated PP modified by reactive monomers. The chemical interaction, crystallization and melting behavior, thermal stability, morphology, and surface contact angle of masterbatch were investigated with I…
Abstract The phase transitions and the morphology of hard‐segment domains of those siloxane‐containing hard‐segmented polyurethane copolymers are studied by differential scanning calorimetry (DSC). The NH‐SiPU2 copolymer, which comprises a siloxane–urea hard segment and a polytetramethylene ether glycol soft segment (…
In this work, we studied a newly reported class of colossal nonlinear effects observed near the nematic-isotropic temperature transition. We show that the origin of this nonlinearity may be attributed to the onset of critical opalescence. Large diffraction efficiency (23%) and colossal nonlinear refractive index (n2 ≈…
We study the self-aligned growth of a single carbon nanotip on a sharp metal tip via the field-emission-induced growth method. Under typical growth conditions, a micron long nanotip can be formed in around 10 s by field emission in the presence of acetylene gas at ∼10 −2 mbar. The tip radius of the carbon nanotip can…
Abstract A novel polysiloxane softener bearing dodecyl side groups (dodecylpolysiloxane [DDPS]) was synthesized by copolymerization of octamethylcyclotetrasiloxane with dodecyltrimethoxysilane and hexamethyldisiloxane. Chemical structure and film morphology of the synthesized polysiloxane are characterized and investi…
The article examines the characterization of local structures in water-blown flexible polyurethane foams with various amine catalysts. In this study, the authors have applied solid-state nuclear magnetic resonance (NMR) relaxation, nuclear spin diffusion, and Fourier transform infrared (FTIR) microscope analysis on fl…
Dynamic response of a dual-frequency liquid crystal (DFLC) based near infrared phase modulator is investigated through numerical simulations and experiments. The relationships between the optical response times and various voltage driving conditions are studied. An optical phase retarder operating at 1.55 μm wavelengt…
The effect of the recipe on the isocyanurate yield in polyisocyanurate (PIR) foams has been studied quantitatively using ATR—FTIR spectroscopy and the adiabatic temperature method based on the measurement of the reaction temperature during the course of the reaction. In this way, the effect of the index on the PIR rea…
Glänzendes Silber: In einer Überstruktur aus Ag-Nanopartikeln und CdTe-Nanodrähten, die durch ein Streptavidin(SA)-D-Biotin(B)-Affinitätspaar verbunden sind, ist die Lumineszenz des Nanodrahtes verdoppelt. Der beteiligte optische Prozess könnte auch in anderen Metamaterialien ablaufen, und er könnte als Grundlage für…
Abstract The overall crystallization rates of poly (3‐hexyl thiophene) (P3HT) cocrystals with different amount of regioregularity of the components are measured using differential scanning calorimetry (DSC). Two pairs of cocrystals with varying compositions of the component polymers (viz P3HT(R) (regioregularity 92 mo…
Using n -butanol released in situ as the cosurfactant, transparent large-pore mesoporous nanocrystalline anatase (meso-nc-TiO 2 ) thin films with narrow pore size distribution have been successfully synthesized in a Ti(OBu n ) 4 –P123–EtOH–HCl system. Furthermore, the mesopore size can be easily controlled in the rang…
The morphology of the hydrous alumina coating on TiO 2 particles from aqueous precipitation at different pHs and temperatures was studied, and a “phase diagram” was obtained. Al 2 (SO 4 ) 3 solution was the coating reagent, and NaOH solution was the precipitant reagent. The effect of pH and temperature on the hydrolys…