Materials Literature
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A novel and facile preparation method for layer-by-layer (LbL) self-assembled films incorporating quantum dots (QDs) and having intense photoluminescence (PL) from blue to red is presented. Functional sol-gel-derived glass layers prepared by the hydrolysis of 3-aminopropyltrimethoxysilane (APS) or 3-mercaptopropyltrim…
Preferential growth of pure single-walled carbon nanotubes (SWNTs) over multi-walled carbon nanotubes (MWNTs) was demonstrated at low temperature by water plasma chemical vapor deposition. Water plasma lowered the growth temperature down to 450 degrees C, and the grown nanotubes were single-walled without carbonaceous…
This paper reports the studies on micelle formation of new biodegradable amphiphilic poly(ethylene oxide)-poly[(R)-3-hydroxybutyrate]-poly(ethylene oxide) (PEO-PHB-PEO) triblock copolymer with various PHB and PEO block lengths in aqueous solution. Transmission electron microscopy showed that the micelles took an appro…
The effect of iron and iron/yttrium codoping on the densification and grain growth of ultra high‐purity (99.995%) fine‐grained alumina has been studied. The experiments were carried out under both oxidizing (flowing air) and reducing conditions (N 2 /H 2 mixture, p O 2 ∼5.1 × 10 −14 ). For studies carried out in air,…
Closed‐cell foams were fabricated by incorporating two different grades of hollow alumino‐silicate spheres (cenospheres) into a silicon carbide matrix. The matrix was formed by the pyrolysis of a preceramic polymer, and multiple polymer infiltration and pyrolysis (PIP) cycles were employed to minimize the open voids i…
Tensile properties of Tyranno™‐SA near‐stoichiometric silicon carbide (SiC)‐fiber–reinforced chemically vapor‐infiltrated SiC‐matrix composites with pyrolytic carbon interphases were experimentally studied. The influence of interphase thickness in a range of 60–300 nm on the tensile properties of the materials appeare…
A new efficient photocaging system with a fluorescence reporting function has been developed. The photolabile latch is based on adducts of C-nucleophiles with aromatic ketones, such as thioxanthones and xanthones. The system is designed to quantify the release of biological effectors and to monitor their spatial distr…
Surface modification of poly(dimethylsiloxane) (PDMS) was carried out via CF4 plasma treatment. The test PDMS used contains significant amounts of quartz and silica fillers, while the control material is the same PDMS with quartz removed by centrifugation. Fluorination accompanied with roughening was produced on both…
The temperature dependence of the reflectance of the cubic bismuth pyrochlores ${\mathrm{Bi}}_{3∕2}\mathrm{Zn}{\mathrm{Ta}}_{3∕2}{\mathrm{O}}_{7}$, ${\mathrm{Bi}}_{3∕2}\mathrm{Mg}{\mathrm{Nb}}_{3∕2}{\mathrm{O}}_{7}$, ${\mathrm{Bi}}_{3∕2}\mathrm{Mg}{\mathrm{Ta}}_{3∕2}{\mathrm{O}}_{7}$, and ${\mathrm{Bi}}_{3∕2}{\mathrm{…
Four-arm, star-shaped poly(D,L-lactide) (PDLLA) oligomers of controlled molar mass and narrow molar mass distribution were successfully synthesized by use of an ethoxylated pentaerythritol initiator. Derivatization of the terminal hydroxyl groups with either methacrylic anhydride (MAAH) or 2-isocyanatoethyl methacryla…
For the first time, the intercalation properties of acid-activated montmorillonites treated at different acid/clay (w/w) ratios with a cationic surfactant cetyltrimethylammonium (C16TMA) hydroxide are reported. The acid activation causes a reduction in the number of cation exchange sides and, hence improves the exfoli…
Luminescent Y 3 Al 5 O 12 : Eu 3+ (YAG : Eu 3+ ) and Y 3 Al 5 O 12 : Tb 3+ (YAG : Tb 3+ ) powders with nanometre and micrometre-sized particles and films have been successfully synthesized by sol–gel route from alkoxide precursors. Advanced YAG coatings were achieved by spray and dip-coating methods, giving rise to di…
Multilayer films were assembled from a copolymer containing both weakly and strongly charged pendant groups, poly(4-styrenesulfonic acid-co-maleic acid) (PSSMA), deposited in alternation with poly(allylamine hydrochloride) (PAH). The strongly charged groups (styrene sulfonate, SS) are expected to form electrostatic li…
Transparent glass ceramics containing CaF 2 nano‐crystals co‐doped with Er–Yb were developed by heat treatment of glasses in the system SiO 2 –Al 2 O 3 –CaF 2 –LnF 3 (Ln=Er, Yb). The crystal size of CaF 2 increased with increasing heat‐treatment temperature. Upconversion emission intensities at 660 and 540 nm increase…
The inclusion of dopants (such as nitrogen) in diamond nanoparticles is expected to be important for use in future nanodevices, such as qubits for quantum computing. Although most commercial diamond nanoparticles contain a small fraction of nitrogen, it is still unclear whether it is located within the core or at the…
Expansion to a total of 11-17 sequential alanine residues from the normal number of 10 in the polyadenine-binding protein nuclear-1 (PABPN1) results in formation of intranuclear, fibrillar inclusions in skeletal muscle and hypothalamic neurons in adult-onset, dominantly inherited oculopharyngeal muscular dystrophy (OP…
The sinterabilities of fine zirconia powders including 5 mass% Y 2 O 3 were investigated, with emphasis on the effect of Al 2 O 3 at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact including a small amount of Al 2 O 3 increased the den…
Rare‐earth‐doped Ca‐α‐SiAlON phosphors, with the compositions of (Ca 1−3/2 x RE x ) m /2 Si 12− m − n Al m+n O n N 16− n (RE=Ce, Sm, and Dy, 0.5≤ m =2 n ≤3.0), were prepared by sintering at 1700°C for 2 h under 10 atm N 2 . The concentration of rare earths varied from 3 to 30 at.% with respect to Ca. The photoluminesc…
Replacement of natural inorganic cations of clay minerals with organic cations has been proposed as a strategy to improve the adsorptive capacity of clay minerals for organic compounds, including pesticides. The organic cations most commonly used for this purpose have been quaternary ammonium ions containing alkyl or…
The local structural environment and the spatial distribution of the lithium ions in lithium silicate glasses with composition ${({\mathrm{Li}}_{2}\mathrm{O})}_{x}{({\mathrm{SiO}}_{2})}_{1\ensuremath{-}x}(0<x\ensuremath{\leqslant}0.40)$ is studied by nuclear magnetic resonance (NMR) and molecular dynamics (MD) simu…