Planar Voronoi cells : the violation of Aboav's law explained
25 pages
Materials Literature
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Les microgenèses situées.Unités et procédés d’analyse inductive - déductive
L’objectif de cette contribution est d’expliciter les procédés d’interprétation des données qualitatives dans un cadre théorique spécifique, celui des microgenèses situées. Il s’agit de présenter brièvement ce cadre, puis de mettre en lumière ses exigences méthodologiques et ses procédés d’analyse. Ce faisant, la cont…
Encapsulation of Enzymes Using Polymers and Sol-Gel Techniques
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…
Preparation of micro -and nanocrystalline CdSe and CdS thin films suitable for sensor applications
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…
Intensity of Singular Stress at the End of a Fiber under Pull-out Force
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…
Preparation of Zn[sub 1−x]Mg[sub x]O Film by Electrochemical Reaction
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 .
Molecular order and disorder of surfactants in clay nanocomposites
Disorder of intercalated surfactant molecules in clay minerals causes gradual swelling, rather than commonly assumed swelling in discrete steps.
Design of antenna radome composed of metamaterials for high gain
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…
A new 2D network built from potassium sandwiches {K[Cu II 3 (bdap) 3 ] 2 } and {(μ 1,3 -SCN) 3 Cu I (NCS)} anions: structure and magnetic behaviour
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 use in the near infrared
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.
Influence of Enzymes and Surfactants on the Disintegration Behavior of Cross-Linked Hard Gelatin Capsules During Dissolution
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…
Determination of free concentration of Paclitaxel in liposome formulation.
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…
Development of an Electroless Method to Deposit Corrosion-Resistant Silicate Layers on Metallic Substrates
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…
Optical Properties of Rod-like Fluorinated Polyimides and Model Compounds Derived from Diamines having High Electron-donating Properties
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…
s-Triazine and tri-s-triazine based organic–inorganic hybrid gels prepared from chlorosilanes by exchange reactions
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.
Relation between Strength, Fracture Toughness, and Critical Frontal Process Zone Size in Ceramics
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…
Organised structures of flexible bolaamphiphiles with trisiloxane spacers: three- and two-dimensional molecular assemblies with different molecular conformation
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…
Solubility in Fluorinated Medium and Thermal Properties of Europium(III) Complexes with Phosphine Oxides
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 Teflon® PFA with vacuum UV photo-oxidation
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;…
High Field Electrical Conduction in the Nanocomposite of Low-density Polyethylene and Nano-SiOX
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…