Materials Literature
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This chapter describes two enzyme immobilization methods based on the biomolecule encapsulation into polymer matrices: the sol-gel technology and the entrapment into the polymer poly(vinyl alcohol) with styrylpyridinium groups (PVA-SbQ). The sol-gel technology is based on the formation of silica matrices of metal or s…
Thin films of CdS (30-200 nm) and CdSe (10-100 nm) are prepared by physical vapour deposition using one-step (for CdS and CdSe) or step-by-step (for CdSe only) approach. Atomic force microscopy measurements reveal a grain size decrease with decreasing layer thickness. The effect is strongest in the step-by-step CdSe l…
In this study, singular fields at the ends of fibers are discussed by the use of models of rectangular and cylindrical inclusions in a semi-infinite body under pull-out force. The body force method is used to formulate those problems as a system of singular integral equations where the unknown functions are densities…
films were prepared on conductive substrates from a magnesium nitrate aqueous solution containing zinc sulfite kept at by electrochemical deposition techniques. In particular, film with the wide bandgap energy of was grown on conductive substrate at cathodic potential of .
Disorder of intercalated surfactant molecules in clay minerals causes gradual swelling, rather than commonly assumed swelling in discrete steps.
The design of antenna radome utilizing the left-handed materials at a frequency close to 5 GHz for the first time for enhancing the antenna gain is presented. We make use of the multi-layered structure composed of two materials with left-handed materials and air. The two materials have an average index of refraction a…
The addition of a solution of excess K(SCN) to an aqueous solution containing Cu(NO3)2.6H2O and 1,3-bis(amino)-2-propanol (bdapH) yields a novel 2D mixed Cu(I)-Cu(II) complex; X-ray diffraction and magnetic studies are reported herein.
InAs(x)Sb(1-x) alloy nanocrystals for the near-infrared, which have quite a monodisperse crystalline structure of 2.5-3.0 nm and are of a zinc blend structure, are developed.
Gelatin exhibits cross-linking upon storage at stress conditions. Capsules stored at these conditions fail to show appropriate in vitro dissolution. The aim of this study is to show the effect of surfactants in the medium on the disintegration of the gelatin capsule. This is demonstrated in the presence and absence of…
PURPOSE: An important step in the development of liposome-based formulations is estimating the free drug concentration in the aqueous solution surrounding liposomes. This research presents a new method for determination of free concentrations, based on membrane-protected solid-phase microextraction (SPME). METHODS: Fo…
A novel electroless method for depositing corrosion-resistant silicate layers on metallic substrates from aqueous solutions has been developed. The silicate layer was deposited from an aqueous solution of sodium silicate (3.22 weight ratio sodium silicate, 37.5% solution in water from PQ Corporation) and sodium borohy…
The thermal and optical properties of four kinds of aromatic polyimides (PIs) having a common skeletal structure have been investigated using thermogravimetric analysis and UV/Vis absorption and fluorescence spectroscopy. Pyromellitic dianhydride (PMDA) and 1,4-difluoropyromellitic dianhydride (P2FDA) were used as the…
Hybrid polymers [(DeltaO3)4Si3]n and [(DeltaO3)SiMe]n (where Delta = C6N7 or C3N3) have been prepared by a novel sol-gel process based on exchange reactions of MeSiCl3 or SiCl4 with C6N7(OSiMe3)3 and C3N3(OSiMe3)3.
In order to improve the fracture toughness of inherently brittle ceramics, a new material design concept must be developed. One suitable concept involves the use of dislocation activities. Intra-type ceramic-based nanocomposites use dislocation activities to enhance strength and fracture toughness. The dislocations ar…
We designed and synthesised new bolaamphiphiles consisting of hydrophobic rigid cores, flexible trisiloxane spacers, and terminal ammonium groups. Organised structures of the bolaamphiphiles with biphenyl and azobenzene cores were examined in the bulk and in the monolayer states. In the bulk states, these molecules ex…
Relationships between molecular structures of three types of europium complexes and solubility in hexane and fluorinated media were investigated. The solubility of europium complexes with β-diketones (type-1) was correlated to the substituents of β-diketones. Introducing bulky substituents was effective for enhancing…
Surface modification of poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (PFA) with vacuum UV (VUV) photo-oxidation using radiation from excited Ar atoms downstream from an Ar microwave (MW) plasma shows: (1) an improvement in wettability as observed by water contactangle measurements; (2) surface roughening;…
Molecular structure and morphology of a nanocomposite of low-density polyethylene (LDPE) and nano-SiOx were studied by dynamic mechanical analysis (DMA). The storage modulus (E/) and the glass transition temperature (Tg) of the nanocomposite are higher than those of pure LDPE and vary with nano-SiOx contents in U-shap…
A novel series of valence tautomeric (VT) complexes, [Co(Cnbpy)(3,5-DTBQ)2] (Cnbpy = 4,4'-dialkyl-2,2'-bipyridine (alkyl = (C(n)H(2n+1)) where n = 0 (CoC0bpy), 1 (CoC1bpy), 5 (CoC5bpy), 9 (CoC9bpy) and 13 (CoC13bpy); 3,5-DTBQ = 3,5-di-tert-butylsemiquinonate or catecholate), including two previously reported complexes…
For the first time highly-oriented AlPO4-5 molecular sieve films have been achieved on millimeter-sized AlPO4-5 single crystal substrates by epitaxial growth. The orientation of the molecular sieve films can be adjusted via changing the basal faces of the substrate crystal. Furthermore, a laser dye has been successful…