Materials Literature
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Functionally graded materials (FGMs) are a new class of materials whose compositions change from one surface to another surface. FGMs can be fabricated under a centrifugal force. Fabrication methods of FGMs under the centrifugal force are classified into three categories, namely centrifugal method (application of cent…
We present a model for the simulation of ferroelectric hysteresis loops. It is based on the Preisach operator and takes advantage of an analytic weight function for the underlying fundamental switching operators. The five independent parameters describing this weight function are determined for a discoidal piezocerami…
Adsorption behaviors of dodecanethiol (C 12 H 25 SH) molecules are investigated on the surface of single‐walled carbon nanotubes (SWCNTs) with vibrational and X‐ray photoelectron spectrometers. The active adsorption sites are proved as Stone‐Wales (SW) defects (5–7 ring defects). The SW defect‐removed SWCNTs formed by…
In this paper, we report on photoluminescence decay measurements on CdSe quantum dots (QDs) as a function of size in the diameter range of 2.1 to 3.5 nm. The nanoparticles were synthesized by the kinetic growth method from CdO and elemental Se precursors. We studied the effects of growth time on the diameter, emission…
In this communication, a method is described for estimating the order of magnitude of energy yield and detonation depth for underwater explosions, based on the acoustical signals radiated. The method determines the ratio of the periods of the first two oscillations made by the gas bubble formed by an explosion, with b…
Al-rich single-crystal mullite [Al(2)(Al(2.8)Si(1.2))O(9.6)] nanowires were prepared by B(2)O(3)-doped molten salts synthesis. The nanowires have diameters in the range 30-50 nm and typical lengths of 1 microm. The mullite nanowires were well dispersed and facile to obtain.
We describe the preparation, the crystal structure refined from neutron powder diffraction (NPD) data, and study of the permittivity of two related double perovskites, Pb2Sc(Ti0.5Te0.5)O6 and Pb2Sc(Sc0.33Te0.66)O6. These compounds were synthesized by standard ceramic procedures; Rietveld refinements from room temperat…
AIM: To develop the simple, rapid and sensitive dual-label time-resolved fluoroimmunoassay for pepsinogens in human serum. METHODS: Based on two-site sandwich protocol, monoclonal antibodies (McAbs) against pepsinogen I (PG I) and PG II were co-coated in 96 microtitration wells, and tracer McAbs against PG I and PG II…
A novel thionine (TH) sensing platform was proposed based on immobilization of TH on a periodate-oxidized chitosan (CS) modified glassy carbon electrode (GCE) surface. Oxidation of CS by periodate can lead to the cleavage of carbon–carbon bonds on the pyranosidic ring of CS, with the generation of dialdehyde groups. T…
Spherical particles of ordered mesoporous aluminium organophosphonates (AOPs) were fabricated by spray-drying of precursor solutions containing Pluronic F127 (EO106PO70EO106) at low temperature. Expansion of the mesopores (10.5 nm) were investigated using the triblock copolymer by the addition of typical aromatic comp…
The polarizability and redox properties for the tetranuclear vanadium-oxide-carboxylates have been investigated using density functional theory (DFT). These so-called inorganic crown ethers possess large polarizabilities, which are equivalent to fullerene and generate large polarization on the guest anions into the ho…
A method that significantly improves the charge-transfer barrier properties of self-assembled n-alkanethiol films on polycrystalline copper is presented in this paper. Chemically-formed films were further modified electrochemically by repetitive potentiodynamic cycling in ethanolic solutions containing small quantitie…
Reactions of 2,6-diacetylpyridine dioxime (dapdoH₂) with Mn(NO₃)₂ or Mn(SO₃CF₃)₂ under a variety of conditions or co-ligands yield compounds with the formula [Mn₆O₂(OMe)₂(dapdo)₂(dapdoH)₄](X)₂ in which X = NO₃⁻ (1) or SO₃CF₃⁻ (2), [Mn₈O₂(dapdo)₆(NO₃)₂]·H₂O (3) and [Mn(dapdoH₂)(N₃)₂](n) (4). Compounds 1, 3 and 4 were s…
NiTi shape memory alloys are considered to be difficult to machine. Dimensional accuracy can hardly be met especially in micro-machining. Being a non-contact tool and therefore independent from machining forces, the laser is a promising alternative for manufacturing NiTi micro-parts. This paper presents research resul…
Polymeric nanofibers fabricated via electrospinning are regarded as promising scaffolds for biomimicking a native extracellular matrix. However, electrospun scaffolds have poor porosity, resulting in cells being unable to infiltrate into the scaffolds but grow only on its surface. In this study, we modified regular el…
Walnut-like structures made up of a polyaniline (PANI) nanofiber network and polystyrene (PS) microspheres are successfully fabricated by a novel approach, “competitive adsorption–restricted polymerization”. In the reaction system, PS microspheres are simultaneously encapsulated by cationic surfactant and aniline hydr…
Chitosan is a biocompatible, biodegradable and non-toxic material. It is also an advanced material used for wound dressings, drug and gene delivery, and tissue engineering. In this study, we treated chitosan film with argon plasma and characterized both its physical and chemical properties. We found that argon plasma…
Multi‐walled carbon nanotubes (MWNTs) were hydrogenated by using lithium in ethylenediamine under Benkeser's conditions, which is convenient due to the avoidance of liquid ammonia used in the classical Birch reaction. The hydrogenated MWNTs were characterized by Raman, infrared spectroscopy, transmission electron micr…
Life prediction of steel structure in marine environment is a challenging task for design and corrosion engineers for existing structures as well as new structures to be constructed. The rate of marine corrosion is a complex function of many parameters of fluid properties and chemistry of seawater. The major parameter…
Influence of SiC composition with different particle size on mechanical properties and microstructure of reaction-bonded SiC have been investigated using infiltration process of liquid Si. SiC specimens were prepared by reaction-bonding sintering at 1620°C in vacuum using different SiC–C composition. Reaction-bonded S…