Polymer microstructures are incorporated in biomicroelectromechanical system (BioMEMS) devices with applications ranging from drug creening to defense applications. Nanomechanical characterization of the polymer components must be carried out in order to design reliable evices. This paper presents the nanoindentation characterization of polymer beams fabricated through soft lithography-based te...

The effect of clay and chemical cross-linking on the dynamic mechanical properties polyurethane reinforced with different concentrations organically modified montmorillonite is investigated in this study. matrix constituted polytetrahydrofuran soft segment 4,4′-methylenebis(phenyl isocyanate) hard segment. Glycerin was used as crosslinking agent, while Cloisite 30B reinforcing filler. nanocompo...

The degree of the over-consolidation ratio (OCR) silty clay affects soil’s mechanical properties and in situ test results. present study utilized numerical analysis to investigate behavior cone penetration pore pressure dissipation typical soils, while also taking into account impact (OCR). Effective stress finite-element analyses, which accounted for considerable deformation, were carried out ...

The efficiency in water treatment by granulated complexes formed from the clay bentonite with (i) micelles of cations octadecyltrimethyl-ammonium (ODTMA) or (ii) liposomes didodecyldimethyl-ammonium (DDAB) was investigated. bentonite–ODTMA were synthesized three variations: I. mass ratio 68/32, which resulted an excess positive charge half cation exchange capacity and is denoted “ordinary”; II....

The mechanical properties of non-vulcanized natural rubber and dialyzed natural rubber-clay nanocomposites have been studied by uniaxial deformations to evaluate the reinforcement efficiency of the clay. We show that while non-rubber molecules contribute to auto-reinforcement, removal of these molecules improves significantly the performance of clay as reinforcement agent. These mechanical prop...

[1] To understand the aqueous history of Mars, it is critical to constrain the alteration mineralogy of the Martian surface. Previously published analyses of thermal infrared (l = 6–25 mm) remote sensing data of Mars suggest that dark regions have 15–20% clay minerals. However, near-infrared (l = 1–3 mm) spectral results generally do not identify widespread clay minerals. Thermal infrared detec...

This study investigated the structure, mineralogical specifics and chemical composition, of a natural and modified diatomite ore, which obtained from the Aktyubinsk /Kazakhstan deposits by using SEM, XRF, XRD, FTIR, TGA and SDTA. Three modified forms of diatomite’s were prepared by calcinations at 900C and/or calcinations and acidification by 0.5 N HCl (D, D-HCl, D-900 and D-900-HCl). The iron(...

Raw clays, extracted from Bana, west Cameroon, were modified with semiconductors (TiO2 and ZnO) in order to improve their depollution properties the addition of photocatalytic properties. Cu2+ ions also added clay by ionic exchange increase specific surface area. This insertion Cu was confirmed ICP-AES. The presence TiO2 ZnO detection anatase wurzite, respectively, using X-ray diffraction. comp...

A thermoplastic polyurethane (TPU) nanocomposite was synthesized based on Maghnite as an inorganic reinforcement phase. The result of this study to evaluate the gas barrier properties a material containing clay nanoparticles. preparation prepolymer with NCO terminations carried out using in situ solution polymerization method. has already been modified by intercalation 12-amino decanoic acid mo...

This work attempts to explore the dynamic and steady-state rheological properties of chitosan modified clay (CMCs) at highly hydrated state. CMCs with different initial chitosan/clay weight ratios (s) were prepared from pre-exfoliated clay via electrostatic adsorption process. Thermogravimetric analysis and optical microscopy were used to determine the adsorbed content of chitosan (m) in CMCs a...