interfacial adhesion between ionic copolymers and high-modulus surface-treated carbon fibers

to increase interfacial strength, the research described focuses on modifying the fiber surface (via high-temperature acid treatment or zinc electrolysis) to facilitate chemical functional groups on the fiber that might increase fiber-matrix interactions the thermoplastic matrix materials used were random copolymers of ethylene and methac..

the fibre/matrix interfacial shear strength in titanium alloy matrix composites reinforced by silicon carbide or boron cvd filaments

the mechanical adhesion between cvd filaments (b, sic) and titanium matrices was studied. because a single fiber composite was chosen for this purpose, the critical length measurement and the shear strength were calculated using a statistical analysis. the study indicated the role played by the surface treatments of the fibers on the rein..

wetting improvement of carbon or silicon carbide by aluminium alloys based on a k/sub 2/zrf/sub 6/ surface treatment' application to composite material casting

a surface treatment with aqueous solutions of k/sub 2/zrf/sub 6/ has been carried out to improve, in dramatic manner, the wetting of carbon (or sic)-base ceramics by liquid light alloys at low temperatures (i.e within the 700 to 900 degrees c range). the mechanism which is thought to be responsible for the wetting improvement involves two..

electrochemical fabrication of amperometric microenzyme sensor

enzyme electrodes were microfabricated by electrochemical incorporation of enzyme molecules in the continuously electrochemically developing micropores of platinum black particles two electrochemical processes, electrochemical absorption of enzyme molecules and reductive deposition of metallic microparticles from its complexal form, were ..

method for measuring the glossiness of curved surfaces and its application for pearls

the psychological glossiness g/sub ph/ observed by humans depends on the radius of curvature of the object, even if the material and the surface finish are identical. however, the conventional physical glossiness is almost unrelated to g/sub ph/. a system for measuring the indistinctness-degree glossiness g/sub id/ has been fabricated wit..

spin-on diffusion for silicon solar cell fabrication

the process parameters of spin-on diffusion technique for the fabrication of single crystal silicon solar cells have been investigated in some detail. it is shown that a simple hydrophilic surface treatment before the thermal diffusion greatly improves the uniformity of spin-on diffusion on texturised silicon solar cell. it is also report..

integrated multi-biosensors based on an ion-sensitive field-effect transistor using photolithographic techniques

two kinds of multifunctional biosensors, one sensitive to glucose and triolein and the other to glucose and urea, have been constructed using semiconductor fabrication techniques. an integrated isfet (ion-sensitive field-effect transistor) with three hydrogen-ion-sensitive fet elements on one chip was used as a transducer for the biosenso..

prediction of viscoelastic properties of glass/ether-amide block copolymer composite materials

a model is developed to predict the thermomechanical behavior of composite materials based on ether-amide block copolymers (peba) as matrix and woven glass fiber reinforcement. from viscoelastic properties (storage modulus, e', and loss factor, tan delta ) of pure peba matrices, the characteristics of composites are calculated and compare..

continuous micro-indenter push-through technique for measuring interfacial shear strength of fiber composites

describes a continuous push-through, micro-indentation technique for measuring the fiber-matrix interfacial shear strength e-glass fibers embedded perpendicular to the plane of thin polished specimens of epoxy matrix, with and without coupling agents were indented with a micro-indenter until failure of the interface occurred and the fiber..

depth profiling of multilayered samples and comparisons of secondary ion and laser desorption mass spectra in the same instrument

a secondary ion mass spectrometer, interface in an nd'yag laser via an optical fiber, has been used for direct comparisons of secondary ion and laser desorption mass spectra of the same samples the quality of the mass spectra obtained by both techniques is similar. sharp differences in the secondary ion and laser desorption mass spectra a..