Materials Literature
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A prototype of an automatic micropositioning system was developed. This prototype uses a shape memory alloy (SMA) actuator, a dedicated PI controller and a piece of software to command a desired motion profile for the actuator. The proposed micropositioning system is characterized by a 4 mm stroke, a 1 μm resolution a…
Anthracene-based microporous polymers comprised of different dicarboximide units (AMPs) are synthesized efficiently by the dioxane forming reactions. AMPs display a BET surface area in the range of 800–1241 m2 g−1, and reversibly adsorb 1.90 wt% H2 at 1.13 bar/77 K with an isosteric heat of adsorption of 7.4 kJ mol−1.…
A facile synthesis of 3–6 nm, water dispersible, near-infrared (NIR) emitting, quantum dots (QDs) magnetically doped with Fe is presented. Doping of alloyed CdTeS nanocrystals with Fe was achieved in situ using a simple hydrothermal method. The magnetic quantum dots (MQDs) were capped with N-acetyl-cysteine (NAC) liga…
The morphological transformation of one dimensional ZnO nanorods to three dimensional hierarchical nanoflowers was observed by hydrothermal growth. The growth period was found to influence the morphology change from rod to flower-like morphology. Hierarchical flower-like nanostructures with an average diameter of 8 μm…
We have fabricated supra-amphiphiles by charge-transfer complexation of azulene-based amphiphiles and pyrene in water, and the self-assembled nanostructures can reversibly change between cylindrical micelles and disklike nanosheets in response to interaction with guest molecules.
We report measurements of the hydrodynamic drag force acting on a smooth sphere falling down under gravity to a plane decorated with microscopic periodic grooves. Both surfaces are lyophilic, so that a liquid (silicone oil) invades the surface texture being in the Wenzel state. A significant decrease in the hydrodynam…
We report the fabrication of novel microcapsules with membranes of co-polymerised cyclodextrin (CD) and polyallylamine hydrochloride (PAH) which allows control of the membrane pore size depending on the type of CD used. The microcapsules were produced by interfacial cross-linking reaction of PAH and CDs with epichloro…
By virtue of periodic density functional theory, we investigate structure and thermodynamic stability of (VO)k and (VO2)k (k = 1, 2, 3) clusters deposited on the CeO2(111) surface, which serve as models for the very active sub-monolayer vanadia catalyst on a ceria support. We find V always completely oxidized (oxidati…
Reactions of [Mn6O2(piv)10(py)2.5(piv)1.5], Ln(NO3)3·6H2O and N-mdeaH2 in MeCN in the presence of Me3SiCl generated a family of octanuclear Mn/Ln complexes [Mn6(III)Mn(II)Ln(N-mdea)3(N-mdeaH)(piv)8O2(OH)3(NO3)(H2O)]·xCH3CN·xH2O [Ln = Gd (1), Dy (2), Er (3), pivH = pivalic acid, N-mdeaH2 = N-methyl diethanolamine]. Eac…
Three sulfonic azobenzenes with tiny differences in the terminal were used to manipulate the assembly of cationic dipeptides (CDP); assemblies with diverse morphologies including urchin-like, flower-like and plate-like structures were formed.
Isoindigo based conducting polymers have attracted extensive interest for polymer solar cell application since isoindigo is a green material and renewable from plants. We have synthesized four soluble low band gap isoindigo based polymers (PCI) with cyclopentadithiophene (CPDT) as the donor unit and isoindigo (I) as t…
We have made a detailed characterization of the molecular weight dependence of isothermal gold nanoparticle embedding into the surface of atactic polystyrene films. Polymers in the range 3 × 103 < Mw < 1.2 × 106 g mol−1 were used within a temperature range that encompassed the bulk glass transition temperature, around…
A pulsed laser deposition process using ozone as an oxidant is developed to synthesize manganese oxide nanosheet arrays, which display excellent rate capability (52% capacity retention at 100 A g−1), comparable capacitance (337 F g−1 at 1 A g−1) and long cycle life (without degradation after 6000 cycles).
Disaggregated magadiite was obtained through ion-exchange in acidic media from magadiite intercalated in the synthesis with cetyltrimethylamonium cations. The combination of Soxhlet extraction and ultrasound during the procedure resulted in different morphology and different properties when compared with the pristine…
Two new 3-D boratopolyoxovanadates {[Zn2NaV12B16O50(OH)8(H2O)7]}·7(H3O)·4H2O (1) and [Cd3Na3.5V12B16O50(OH)8(H2O)8]·2.5(H3O)·11H2O (2) were synthesized employing hydrothermal reactions and structurally characterized. Both 1 and 2 contain the boratopolyoxovanadate cluster [V12B16O50(OH)8]12− built up from one continuou…
We have synthesized an efficient and highly sensitive nanoamplifier composed of gadolinium-doped silica nanoparticles and gold nanoparticles (AuNPs). Magnetic resonance imaging (MRI) in vitro and in vivo assays revealed enhancement of signal sensitivity, which may be explained by electron transfer between water and ga…
Control of the morphology, mesostructure, and surface chemistry of multifunctional materials is important for their applications. We report here the fabrication of multifunctional spheres which possess a silica-coated magnetite core and a highly aminated mesoporous silica shell with radially aligned ordered pore chann…
In this paper, core–shell Fe2O3@SnO2 nanohybrids were fabricated via a simple flame-assisted spray pyrolysis (FASP) process. A shell layer composed of SnO2 nanocrystals (8–10 nm) was grown in situ on the pristine Fe2O3 nanoparticles, with a tailored thickness ranging from 6–20 nm. The construction of such an intriguin…
Molecular dynamics simulations were performed to investigate how the orientation of grain boundary (GB) affects the tensile mechanics of polycrystalline graphene, where two opposite GB groups, i.e., armchair (AC) and zigzag (ZZ)-oriented tilted GBs were considered for the anisotropic study. We found very close mechani…
We study the assembly of PMMA cylinder forming poly(styrene-block-methyl methacrylate) in three different geometries: planar surface, and chemically homogeneous and heterogeneous graphoepitaxy as a function of film thickness and surface chemical composition. On planar surfaces, perpendicular orientation can be achieve…