Trimeric liquid crystals assembled using both hydrogen and halogen bonding
New liquid crystals are reported that are formed from non-mesomorphic components assembled using both halogen and hydrogen bonding.
Materials Literature
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Preparation of Magnetic Nanoparticles Encapsulated by an Ultrathin Silica Shell via Transformation of Magnetic Fe-MCM-41
Sub-10-nm Fe 2 O 3 nanoparticles were successfully encapsulated within uniform-sized 10 nm silica nanospheres with ultrathin walls (ca. 1 nm) via the transformation of iron-loaded mesoporous MCM-41. This represents a new synthesis approach that involves the deposition of either an iron precursor (i.e., Fe 3+ ) or nano…
Fullerene-encapsulated porphyrin hexagonal nanorods. An anisotropic donor–acceptor composite for efficient photoinduced electron transfer and light energy conversion
We have successfully constructed fullerene-encapsulated porphyrin hexagonal nanorods in DMF-acetonitrile solution mixed with CTAB surfactant, which demonstrate efficient and characteristic photoinduced electron transfer and light energy conversion properties.
Homo- and heteroleptic zinc aminophenolates as initiators for lactide polymerization
The reaction of ZnEt2 with one or two equivalents of aminophenolate ligand N-[methyl(2-hydroxy-3,5-di-tert-butylphenyl)]-N-methyl-N-cyclohexylamine gives hetero- and homoleptic molecular compounds [(micro,eta2-L2)ZnEt]2 and [Zn(eta2-L2)2]. The later is most probably a mixture of diastereoisomers that in solution shows…
Synthesis and characterisation of a Ni4 single-molecule magnet with S4 symmetry
[Ni4Cl4(HL)4] () {H2L=HN(CH2CH2OH)2} has S4 symmetry and crystallises in the tetragonal space group I4(1)/a. Two exchange couplings are observed between the four Ni(II) centres, with J1=7.29 cm(-1) and J2=-2.08 cm(-1), leading to an S=4 ground state. The Ni4 complex shows the onset of frequency dependent signals in th…
Fire Retardancy of Polymers
Globally, fire retardants are needed to satisfy a multibillion dollar market. Fire retardancy of polymeric materials is an important component of fire safety. Fire retardants either reduce the likelihood of ignition and/or reduce the rate of flame spread and hence, escalation of fire. The need to comply with safety le…
Gold–platinum bimetallic clusters for aerobic oxidation of alcohols under ambient conditions
We have developed gold/platinum alloyed bimetallic cluster catalysts supported on a cross-linked polystyrene derivative, which present much higher activity and selectivity than single metal gold or platinum clusters for aerobic oxidation of alcohols under ambient conditions.
Luminescent Properties of Cerium-Activated Garnet Series Phosphor: Structure and Temperature Effects
The behaviors of Y, Tb, and Gd garnet phosphor powders activated by cerium were studied. Emission spectra with a continuous yellowish range from green-yellow to yellow-orange were produced by controlling the compositions of the solid solution. By increasing the substitution concentration of large cations in the garnet…
Time-resolved luminescence microscopy of bimetallic lanthanide helicates in living cells
The cellular uptake mechanism and intracellular distribution of emissive lanthanide helicates have been elucidated by time-resolved luminescence microscopy (TRLM). The helicates are non-cytotoxic and taken up by normal (HaCat) and cancer (HeLa, MCF-7) cells by endocytosis and show a late endosomal-lysosomal cellular d…
Silica-free syntheses of hierarchically ordered macroporous polymer and carbon monoliths with controllable mesoporosity
Hierarchically ordered macroporous polymer and carbon monoliths with walls containing face-centered cubic or 2D-hexagonal mesopores were synthesized via a facile dual-templating technique using poly(methyl methacrylate) (PMMA) colloidal crystals and amphiphilic triblock copolymer surfactants as templates. A nanocastin…
Formation and characterization of surfactant stabilized silver nanoparticles: A kinetic study
Kinetic data for the silver nitrate-ascorbic acid redox system in presence of three surfactants (cationic, anionic and nonionic) are reported. Conventional spectrophotometric method was used to monitor the formation of surfactant stabilized nanosize silver particles during the reduction of silver nitrate by ascorbic a…
A multifunctional organometallic switch with carbon-rich ruthenium and diarylethene units
The perturbation of a dithienylethene system by a ruthenium carbon-rich system, and vice versa, was used to reach a unique and sophisticated light- and electro-triggered multifunctional switch featuring multicolor electrochromism, electrocyclization at remarkably low voltage, and photo/electro tuning of electronic com…
Synthesis and Characterization of Pine Needles Reinforced RF Matrix Based Biocomposites
Synthesis and characterization of pine needles reinforced thermosetting resin (Resorcinol‐Formaldehyde) which is most suitable as composite matrix has been reported. The polycondensation reaction between resorcinol and formaldehyde (RF) in different molar ratios has been applied to the synthesis of RF polymer matrix.…
Influence of Drug-to-Lipid Ratio on Drug Release Properties and Liposome Integrity in Liposomal Doxorubicin Formulations
Recent studies have shown that the release properties of vincristine encapsulated in large unilamellar vesicles (LUV) can be regulated by varying the drug-to-lipid (D/L) ratio. In this work it is shown that the drug-to-lipid ratio technique for regulating drug release also applies to doxorubicin encapsulated in LUV. I…
Stretch and Bagging Properties of Denim Fabrics Containing Different Rates of Elastane
The performance and comfort factors of garments during usage are very important. Generally, the comfortable stretching of fabrics according to body movements as well as recovery after stretching, are good desirable properties. In recent years, due to the demand for more comfortable clothing, which is more adjustable t…
Controlled switching of the wetting behavior of biomimetic surfaces with hydrogel-supported nanostructures
An important feature of biological systems is their response to external stimuli with subsequent changes in properties and function. The ability to “engineer” adaptiveness into next-generation materials is becoming a key requirement and challenge in chemistry, materials science and engineering. Recently we have descri…
Corrosion Inhibition of Aluminum Alloy 2024-T3 by Aqueous Vanadium Species
Nuclear magnetic resonance ͑NMR͒ measurements were made on aqueous vanadate solutions to characterize speciation as a function of pH and vanadate concentration.Additionally, potentiodynamic polarization measurements were carried out on Al alloy 2024-T3 in 50 mM NaCl solutions in which pH and vanadate concentration wer…
Development of the Warp Knitted Spacer Fabrics for Cushion Applications
Polyurethane (PU) foam is a common material used in seats, sofas and mattresses, etc. However, the use of PU foam presents some problems concerning comfort and recycling. Compared with PU foam, warp knitted spacer fabrics can solve these problems. This paper presents work in the development of the warp knitted spacer…
Interactions of micro-rods in a thin layer of a nematic liquid crystal
We present an experimental analysis of the topological properties of a nematic liquid crystal in the vicinity of small cylindrical objects (micro-rods), dispersed in the nematic liquid crystal 5CB (4-n-pentyl-4-cyanobiphenyl). Depending on the type of liquid crystal anchoring on the surfaces of micro-rods, we have obs…
Electroless Deposition of Nanoscale MnO[sub 2] on Ultraporous Carbon Nanoarchitectures: Correlation of Evolving Pore-Solid Structure and Electrochemical Performance
The self-limiting redox reaction of carbon nanofoam substrates with permanganate at room temperature in neutral-pH solutions produces conformal nanoscale deposits throughout the macroscopic thickness of the nanofoam structure. The nanoscale morphology ranges from layered ribbons and rods for a 4 h deposition to polycr…