Three representative nonsteroidal anti-inflammatory drug molecules, Ibuprofen, Diclofenac, and Indomethacin, have been intercalated within the galleries of an anionic clay, Mg-Al layered double hydroxide (LDH). X-ray diffraction, IR and Raman vibrational spectroscopy and (13)C cross-polarization magic-angle spinning NMR have been used to characterize the confined drug molecules, while molecular...

Abstract This paper presents a framework for modelling the random variation in permeability cement-admixed soil based on binder content and thereby relating coefficient of to unconfined compressive strength clay. The strength–permeability relationship was subsequently implemented finite element method (RFEM). effects spatial both clays RFEM is illustrated using two examples concerning one-dimen...

Introduction: In the search for life on Mars nearsurface soil environments may be important habitats for life accessible to future missions. Serpentinite rocks have been documented on Mars [1], as well as other clay minerals including smectite and kaolinites [2, 3]. Previous studies of soils formed on serpentinites on Earth have documented the formation of extensive clays, including smectite [4...

Using the layer-by-layer (LbL) assembly technique, we create a polymer-clay structure from a unique combination of LbL materials: poly(ethylene imine), Laponite clay, and poly(ethylene oxide). This trilayer LbL structure is assembled using a combination of hydrogen bonding and electrostatic interactions. The films were characterized using ellipsometry, profilometry, X-ray photon spectroscopy, a...

Hybrid nanostructures based on amoxicilin – hydrotalcite type anionic clays were synthesized by using coprecipitation and reconstruction of initial structure as synthesis methods. Scanning electron microscopy (SEM) technique and nitrogen adsorption-desorption isotherms was used to describe textural characteristics of the obtained hybrids. The plate let morphology defines the texture of the iron...

In situ atomic force microscope observations were made of the adsorption of anions (1- or 2-) of the organic diacid 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid from aqueous solution onto the (0001) surface of hydrotalcite (HT), a layered clay. This adsorption process is believed to mimic the ion-exchange reactions that occur within the layers of HT and other layered clays. Atomic force mi...

This paper presents model simulation results of vapor intrusion into structures built atop sites contaminated with volatile or semi-volatile chemicals of concern. A three-dimensional finite element model was used to investigate the importance of factors that could influence vapor intrusion when the site is characterized by non-homogeneous soils. Model simulations were performed to examine how s...

in this paper to predict the critical conditions for onset of elastic-plastic wrinkling of flange of a two-layered circular blank during the deep-drawing process a closed-form semi-analytical elastic-plastic solution using tresca yield criterion alongwith deformation theory in plasticity with considernig the perfectly plastic behaviour of materials is presented. simplifying the presented soluti...