Materials Literature
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This Review article details the preparation and encapsulation–release properties of novel amphiphilic hyperbranched polymers with a micellar characteristic as a single molecule, which are referred to as “unimolecular micelles” or “unimolecular nanocapsules”. Amphiphilic hyperbranched polymers consisting of a hydrophil…
There is contemporary research interest in the development of second-order nonlinear optical materials exhibiting large first hyperpolarizabilities (β) for possible applications in electro-optic devices. In this article, the structure–property relationships of octupolar molecules such as tris(bipyridyl) metal ion comp…
Based on the broadside-coupled split-ring resonator (BC- SRR), a tunable left-handed metamaterial (LHM) was proposed in this paper.The two rings of BC-SRR are etched on two separate substrates so that the coupling between the two rings can be adjusted by slightly slipping one of the two substrates relative to the othe…
Abstract: The aim of this study is to investigate the effect of alkali and SLS (Sodium Lauryl Sulphate) treatment on Banana/Kenaf Hybrid composites and woven hybrid composites. The fibers are treated with 10 % of sodium hydroxide (NaOH) and 10 % Sodium Lauryl Sulfate (SLS) for 30 minutes. Woven banana and kenaf fiber…
25 wild plants were collected from the south of Tunisia. The dried aerial parts were extracted under a continuous reflux set-up in a Soxhlet extractor with hexane, ethyl acetate, methanol and water. The extracts were screened for total phenolic content, antioxidant and antimicrobial activities. Total phenolic contents…
Two novel silicon(IV) phthalocyanines substituted axially with two BODIPY or mono-styryl BODIPY moieties have been synthesised, which exhibit predominantly a photo-induced energy or electron-transfer process in toluene depending on the axial substituents.
An improved pegylated liposomal formulation of docetaxel has been developed with the purpose of improving the docetaxel solubility without any need to use tween80 that is responsible for hypersensitivities following administration. Liposomes all had spherical shape with size of 130–160 nm. The most important finding o…
The possibilities of vacancy-induced magnetism in perovskite BaTiO(3) are investigated by first-principles calculations. Calculated results show that both titanium and oxygen vacancies could induce magnetism, but the barium vacancy did not induce magnetism. New and interesting magnetic properties of half-metallic magn…
Cobalt oxide (Co(3)O(4)) nanopolyhedrons and nanosheets were controlled synthesized at the low temperature of 80 degrees C via a novel, simple, aqueous method; the obtained nanosheets are only 2-3 nm thick.
We show that bent-core liquid crystalline materials exhibit non-Newtonian flow in their optically isotropic liquid phase. We conjecture that this behavior is due to the existence of nanostructured, fluctuating clusters composed of a few smectic-like layers. Shear alignment of these clusters explains the shear thinning…
A racemic bis(nitrile) ligand based on the Tröger's base scaffold self-assembles into an achiral dinuclear heterochiral rhomb in a diastereoselective self-discrimination process; this occurs upon coordination to (dppp)Pd(OTf)(2) as evidenced by nmr spectroscopy and X-ray crystal structure analysis.
The current widespread and diverse use of engineered nanoparticles (ENPs) in consumer products is expected to result in direct and indirect emissions to the aquatic environment. In Europe, the Water Framework Directive (WFD) is responsible for maintaining a good chemical and ecological status of surface waters. This r…
Nos últimos anos, o interesse pelo uso de fibras naturais em materiais compósitos poliméricos tem aumentado significativamente. Neste trabalho foram investigadas as propriedades, químicas, físicas, térmicas e estruturais da fibra de sisal brasileira da variedade Agave sisalana. Nosso objetivo foi avaliar a qualidade e…
Here we report on an all-in-one approach to prepare robust antimicrobial films on stainless steel. The strategy is based on the layer-by-layer deposition of polyelectrolytes. A polycationic copolymer bearing 3,4-dihydroxyphenylalanine units (DOPA, a major component of natural adhesives) was synthesized and co-deposite…
A series of zinc complexes with oximate ligands is investigated for their suitability as precursors for zinc oxide in inkjet printing. The variation of hydrogen and alkyl groups in the side chains of the oximate framework (R1–ON–C2O2–R2) of the corresponding zinc complexes influences the decomposition temperature, and…
Single-walled carbon nanotubes (SWCNTs) with large diameters (LDs) (≥3 nm) have wide applications. But, up to now, the synthesis of these novel nanostructured carbon materials is still a great challenge, and exploration of a simple synthesis method suitable for economical and large-scale production is still an importa…
Seven soluble metal nanoparticle catalysts including Pt, Ru, Rh, Pd, Ir, Ag and Au were synthesized and studied for the aqueous-phase selective oxidation of non-activated alcohols under atmospheric pressure of O2. The effects of particle size were examined on the Pt catalysts with mean diameters of 1.5–4.9 nm. Pt nano…
Stable Au and Ag nanoparticles with diameter 5–10 nanometers were synthesized in water at pH 7 and at room temperature by a novel green photocatalytic method. The method features very low energy consumption and non-toxic reagents with high yields of concentrated nanoparticles in aqueous solution obtained in less than…
Nanoparticle technology refers to research and technology developed at the atomic or molecular level for materials of approximately 1-100 nm in length. Through accidental or involuntary exposure, nanoparticles are potentially toxic to the body, including reproductive organs. Ovarian granulosa cells play a major role i…
Despite impressive advances in chemistry and biology, the mimicking of the complexity and functionality of natural cells in artificial systems still remains in its infancy. Liposomes for instance have been extensively used to reproduce some basic properties of cells and particularly biological membranes, whereas other…