Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"Interlamellar"”.
-
Interlamellar modification of smectite clays
… acid sites within the clay. Two methods of interlamellar modification were identified which lead to enhanced conductivity of laponite, namely ion exchange and tin(IV) oxide pillaring. A monoionic potassium exchanged laponite shows a four fold increase in a.c. conductivity compared to sodium …
-
Stereo–Chemical Control of Organic Reactions in the Interlamellar Region of Cation–Exchanged Clay Minerals
Carbene intermediates can be generated by thermal, photochemical and transition metal catalysed processes from diazoalkanes. The carbene intermediates are very reactive and can add across double bonds to give 3-membered rings (cyclopropanes), insert into OH bonds to give esters and insert into …
-
Modification of clays with ionic liquids for polymer nanocomponents
… anionic clays susceptible to exchange of their interlamellar ions with a variety of other cations or anions, were selected. In order to treat cationic clay, montmorillonite, which contains sodium ions as interlayer ions, reagents having cations differing in size and structure included three …
-
Extracellular Matrix Degradation and Mechanical Integrity of Degenerated Human Annulus Fibrosus from Surgical Specimens
… (AF) remains poorly defined in human tissue. The interlamellar matrix (ILM), which binds adjacent collagen lamellae via cross-bridges, is a key determinant of AF mechanical integrity, but whether its weakening is driven by aging, pathology, or both and whether this weakening is linked to …
-
Steric Effects of Alkyl Ammonium Salts on the Combustion of Exchanged Smectite Clays
… of the salts and how they are oriented in the interlamellar region of the clay. The number of alkyl ammonium salts that bind to the negatively charged sites in the clay layers would represent the CEC of the clay. The orientation of the organic cation in the interlamellar region was examined …
-
Spectroscopic and catalytic investigations of transition metal complexes intercalated in layered silicates
… very selective, due to the environment of the interlamellar layer of the clay mineral. The oxidation of 2,6-dimethylphenol leads to a greater selectivity toward the diphenoquinone than the polyphenyleneoxide polymer when the catalytic reaction occurs in the clay inter-layer.
-
Morphology and Mechanical Properties of High Density Polyethylene Exposed to Chlorinated Water
… study of lamellar morphology, a decrease in the interlamellar spacing, lamella thickness, and long period is observed with increased degradation. The critical interlamellar spacing from the ductile to brittle transition for as-extruded HDPE is observed to occur at ~85Å, determined using the XRD …
-
Crystallization behavior of nylon 6/6 and its blends with poly(vinyl pyrrolidone)
… the occurrence of banding), and modification of interlamellar spacings.
-
Co-deformation of an aluminum zinc alloy
… to produce 100% transformation and an interlamellar spacing of 240nm.The material was tested using strain rate jump tests to determine the temperature sensitivity, tensile tested to determine work hardening and the temperature sensitivity, wire drawn to study the effect of large plastic …
-
Influence of Grain Size and Widmanstätten Colonies on Variability of Tensile Properties of Forged Ti-6Al-4V
… Fractography also suggested that the presence of interlamellar decohesion and trans-lamellar failure may have created sites of further crack initiation, resulting in a lower ultimate tensile strength. These differences were theorized to be caused by a temperature gradient created during the heat …
-
Method Development for the Application of Vibrational Spectroscopy to Complex Organic-Inorganic Materials in Astrobiology. A Systematic Development of Raman Spectroscopy and Related Analytical Methods to the Structural Chemistry at Organic (Biological) and Inorganic (Mineralogical) Interfaces of Material Assemblies Relevant to Astrobiology and Inter-Planetary Science.
… of organic residues intercalated into the interlamellar space of smectite type clays was developed. An evaluation of the effectiveness of uni and multivariate methods for the analysis of large datasets containing a small number of organic features was also carried out, with a view to …
-
Intercalation d'anions organiques dans des composés lamellaires de type hydrotalcite.
… M.W = 5,000) was intercalated in the interlamellar space of the mixed Li-Al hydroxide by exchange with chloride. This reaction was carried out in direct fashion, without the initial use of a monomer, and without a preliminary intercalation step.
-
Solution History Effects and Crystal Phase Transformation in Polybutene-1 and Domain Morphology in Polyurethanes
… irregularly stacked crystal lamellae. Although interlamellar taut tie molecules are believed to accelerate transformation, they are not essential for the process. Many linear polyurethanes composed of alternating hard and soft segments have been shown to be composed of two phases. The hard and …
-
The strengthening and "softening" of low-carbon structural steels by silicon
… structures, decarburized layers, random interlamellar spacings in the pearlite constituent, slip line, twin and dislocation structures. The precipitates observed were studied qualitatively with the transmission electron microscope, and microanalysis was carried out by using the dispersed …
-
The regulation of adrenomedullin and neuroglobin in adult zebrafish during exposure to hypoxia
… the chloride cells on the lamellae and in the interlamellar regions of the gill, and throughout all regions of the brain. Immunostaining revealed the presence of adrenomedullin protein in inner plexiform layer, outer plexiform layer and the pigment epithelium of the eye, apical membrane of …
-
Micromechanisms of polymer sliding wear
… metal counterface during sliding wear involves interlamellar shear of the polymer and results in the development of a highly oriented transfer film. Significant differences have been found in the degree of crystallinity, crystallite size and orientation in the deformed surface layers of the …
-
Chemical modification of smectite clays
… XRD data for humidified samples reveal the interlamellar regions to be strongly hydrophobic, with the by-product sodium chloride being expelled to the external surfaces. Many organic cations will exchange onto a clay. The tetracationic cyclophane, and multipurpose receptor, …
-
Towards Mechanical Reinforcement in Polymer Layered Silicates Nanocomposites of the Second Generation
… and shear-stiff, mica-like nanofiller with no interlamellar reactivity. The collapsed state, moreover, allowed a selective organophilization of external basal surfaces of the tactoids using a polycationic macro-initiator (MIn+) with no signs of intercalation. The multiple electrostatic …
-
Effect of microalloying on pearlite transformation of high carbon wire steels
… hardness, pearlite colony size, and pearlite interlamellar spacing (ILS) were characterized for each alloy. All alloys exhibited pearlitic microstructures with some proeutectoid ferrite at prior austenite grain boundaries, with no evidence of shear transformation products. The V steel has the …
-
Structure-Property Relationships: Model Studies on Melt Extruded Uniaxially Oriented High Density Polyethylene Films Having Well Defined Morphologies
… a high temperature α<sub>II</sub> relaxation, a interlamellar shear induced low temperature mechanical relaxation was also observed. It is concluded that the low temperature relaxation is related to the characteristics of the interface between the crystalline lamellae and amorphous layers. In the …
Page 1 of 2