Materials Literature
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Characterization of a free-electron laser (FEL) pulse can be done with a pump–probe scheme, using an FEL pump and a visible light probe on an optically transparent solid-state target. With such experimental scheme, pulse duration can be monitored on a shot-to-shot basis. It relies on the changes in optical properties…
In this paper, we report the fabrication of silicon microtubes (SMT) by electrochemical dissolution of macroporous silicon layers immersed into aqueous solution of NH4F mixed with Na2SO4, at different pH levels (4.5–9.5). Well-defined SMT have been obtained at pH 6.5, 7.5 and 9.5, whereas for other pH levels, the surf…
Unusual specular X-ray diffraction patterns have been observed from certain thin film intergrowths of metal monochalcogenide (MX) and transition metal dichalcogenide (TX2) structures. These patterns exhibit selective “splitting” or broadening of selected (00l) diffraction peaks, while other (00l) reflections remain re…
ABSTRACT Poly(butyl acrylate‐co‐methyl methacrylate)‐montmorillonite (MMT) waterborne nanocomposites were successfully synthesized by semibatch emulsion polymerization. The syntheses of the nanocomposites were performed in presence of sodium montmorillonite (Na‐MMT) and organically modified montmorillonite (O‐MMT). O‐…
Abstract Large single crystals of the tetragonal (space group I 4̅2 d ) guanidinium zinc sulfate, [C(NH 2 ) 3 ] 2 Zn(SO 4 ) 2 , were grown and the crystal structure was redetermined. Vibrational spectra obtained by Raman and IR investigations are presented, together with an assignment of the observed vibration modes.…
Diblock copolymers undergo microphase separation to form various microstructures, for example, lamellar, gyroid, cylindrical, cubic phases depending on composition and segregation strength (Flory–Huggins parameter χ). Thus, it can act as template to organize doped nanomaterials into different 3D self-assembled structu…
The influence of dimensional effects on the compositions and properties of polydicarbonfluoride (C2 F)n prepared from multilayered graphenes was investigated. Multilayered graphenes were produced by destructive thermal decomposition of intercalation compounds of "idealized" (C2 F)n that were obtained by reaction of ga…
Residual velocity of the projectile plays an importance role in evaluating the resistance of the target. A mathematical model of the truncated ogival-nose projectile penetrating into the stiffened plates is designed to describe the destruction according to the momentum conservation theorem, and relationships between t…
The Zr–Nb alloys were modified by doping of Mo as a minor alloying element to seek for the nuclear fuel cladding materials with better characteristics. The effects of Mo on microstructural evolution and mechanical properties in Zr–Nb alloys were systematically investigated and elucidated. Results showed that the marte…
The compound undecyloxy benzoic acid (11Oba) exhibits nematic and smectic-C phases while a nano-doped undecyloxy benzoic acid with ZnO exhibits the same nematic and smectic-C phases with reduced clearing temperature as expected. The doping is done with 0.5% and 1% ZnO molecules. The clearing temperatures are reduced b…
We report a comprehensive study of the flow of liquid triggered by injecting a droplet into a liquid foam microchannel, also called a Plateau border. This drop-injected experiment reveals an intricate dynamics for the liquid redistribution, with two contrasting regimes observed, ruled either by inertia or viscosity. W…
Abstract Antithrombogenicity is one of the most critical properties required for materials used in biomedical devices, particularly in devices that contact blood. The antithrombogenicity of surfaces coated with amphiphilic block copolymers composed of hydrophobic poly(2-methoxyethyl acrylate) (M) and hydrophilic poly(…
Abstract The particle sizes of mesoporous silica nanoparticles most greatly affect their properties, including cellular uptake, cytotoxicity, and dispersity. The growth of colloidal mesostructured silica nanoparticles (CMSS) with particle sizes less than 100 nm was controlled by a modified seed‐growth method by using…
This paper demonstrates a metamaterial capable of realizing a dual-band quasi-zero refractive index and a negative refractive index, which consists of a coin-shaped slice and two parallel planar wires. The zero refractive index is achieved over a very wide frequency range. The bandwidth of the first band of the quasi-…
The polymerization reactions of styrene oxide (SO) at different temperatures for different time intervals were performed by four different tin catalysts, tin(IV) perfluorooctanoate (PFO-Sn), tin(IV) methacrylate (MAc-Sn), tin(II) chloride (SnCl2), and SnCl2/hexamethyldisilazane. Tin(IV) perfluorooctanoate and methacry…
A simple one-pot process to exfoliate graphite and synthesize nanographene-dimesitylporphyrin hybrids has been developed. Despite the bulky mesityl groups, which are expected to hinder the efficient π-π stacking between the porphyrin core and graphene, the liquid-phase exfoliation of graphite is significantly favored…
Based on a survey among specialists, the impact of criteria such as thickness, bulkiness, smoothness, stiffness, extensibility and elasticity on the handle of terry fabrics is evaluated and ranked. A methodology was developed to determine the weight coefficient of the factors involved in the evaluation. A relation was…
ABSTRACT Combination of the organic–inorganic hybrid such as silsesquioxane with ε‐caprolactone will lead to materials expected to be environmentally friendly and applicable to biomedical usages. A ladder‐like poly(phenyl silsesquioxane) based hybrid star‐shaped copolymer of ε‐caprolactone was prepared by ring opening…
Poly( l ‐lysine) dendrimer end‐functionalized with arginine‐6‐oligomer conjugated biodegradable poly(3‐hydroxybutyrate) (PHB)–poly(ethylene glycol) (PEG)–PHB copolymer may be considered a promising macromolecular drug delivery vehicle. To prepare amphiphilic triblock copolymers, bulk ring‐opening polymerization (ROP)…
Hydrolytic degradation of BAB terpolymers with δ-valerolactone as the central (A) block and d, l -lactide as the terminal (B) block was studied by 1 H NMR and Raman spectroscopic techniques. The following variations were investigated: (i) the ratio of δ-valerolactone to d, l -lactide, (ii) replacement of d, l -lactide…