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.
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Showing 1 to 20 of 52 for “"Microporosity"”.
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The influence of microporosity on the mechanical properties of bulk, scaffold, and composite scaffold biphasic calcium phosphate
… scaffolds with multi-scale porosity (macro- and microporosity), and BCP/polymethylmethacrylate (PMMA) composite scaffolds with multi-scale porosity were investigated in this work. The elastic properties of bulk BCP with varying micropore size and fraction were analyzed using resonant frequency …
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Design, Synthesis, Characterization, and Evaluation of Boronate Ester-Linked Porous Materials: Covalent Organic Frameworks and Polymers of Intrinsic Microporosity
… of boronate ester-linked polymers of intrinsic microporosity (PIMs). This family utilized the kink in a spirobisindane bis-diol monomer along with linear and trigonal boronic acids to produce amorphous solids which are intrinsically microporous. The potential of these materials to form permeable …
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Quantitative image analysis of in vivo microstructure and growth factor effects in hydroxyapatite bone scaffolds
… bone formation when combined with scaffolds. Microporosity (<20µm) has also been shown to influence bone regeneration in calcium phosphate (CaP) scaffolds. However, many studies use only the term “osteoconductive” to describe the effects of BMP-2 and microporosity on bone formation, and do not …
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Macro- and micro-structural features direct bone regeneration in patterned biphasic calcium phosphate scaffolds
… the influence of scaffold macro- (> 300 μm) and microporosity (< 50 μm) on bone regeneration in BCP scaffolds implanted in pig mandibles. We evaluate capillarity induced by micropores as a mechanism that affects bone growth in vivo. We also assess the influence on bone volume, bone distribution …
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Porosity in Oolitic Limestones
… the individual grains are microporous, and the microporosity consists of irregular equant pores 1-3 (mu)m in size which are located between the rhombic to anhedral carbonate crystals which make up the ooid cortex. These equant micropores are locally constricted to plates or tubes only 0.1 (mu)m …
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Microstructure-induced capillary force effects on penetration and release in hydroxyapatite bone scaffolds
Ceramic bone scaffolds with both microporosity (<50µm) and macroporosity (>100µm) are known to enhance bone formation. Including microporosity in a scaffold increases bone volume and distribution. The integration of the bone with the scaffold is also improved as both cells and mineralized bone have …
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Mechanical Properties and Microstructure of Copper Alloys and Copper Alloy-Stainless Steel Laminates for Fusion Reactor High Heat Flux Applications
… in the bond interfacial regions including: microporosity, new precipitate formation, existing precipitate morphology changes and interdiffusion of constituent elements.
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Study of the properties of cemented carbides from industrial production
… After that, the influence of the residual microporosity on the mechanical properties was evaluated. Considering the production process, another important modification of the final microstructure of WC-Co occurs due to the liquid cobalt migration phenomenon. Based on this, also the liquid …
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The Effect of Newer Methods of Processing on the Fatigue Strength of Cast Steel
… has been investigated.<br/><br/>It is shown that microporosity in cast steel reduces the elongation, reduction in area, and the fatigue strength. However, hot isostatic pressing at an argon pressure of 103MN/m2 and at temperatures varying from 930 °C. to 1210°C. was effective in closing internal …
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Effects of Estrogen Loss on the Vascular Porosity in Rat Cortical Bone
… research has focused on changes in cortical bone microporosity due to estrogen loss, which is important for bone health; load-induced interstitial fluid flow within the lacunar-canalicular porosity surrounding osteocytes is thought to play an important role in bone maintenance, while the vascular …
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PH-gated porosity and reversible swelling transitions in polyelectrolyte multilayers
… memory effects as well as pH-gated nano- and microporosity in PEMs, are described. The PEMs in this thesis are created by an aqueous processing technique, which enables the straightforward manipulation of processing variables to create molecular-level designed polymeric coatings. The first …
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Fabrication and Evaluation of Specialty Nonwoven Materials
… leads to produce high adsorptive capacity and microporosity. Longer heating time also contributed to high surface area, but widened microporosity and developed mesopores. Surface area of 879.05 m2/g and BJH average diameter of 27.67 Å were achieved when rayon was carbonized and activated at 800 …
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The development and characterization of tailored, high surface area adsorbents for enhanced adsorption
… first time we were able to directly observe the microporosity of amorphous activated carbons using STM. These fundamental properties were related to the adsorbate properties and concentration.
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Porous calcium phosphate granules for biomedical applications
… the produced granules show high interconnected microporosity (0.1-10 Î1⁄4m) and surface roughness, properties necessary for osteoconductivity. The solubility behavior of granules was studied and demonstrated that the morphology and microporosity are more important in dissolution processes than …
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The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples
Microporosity (<50μm) in hydroxyapatite (HA) scaffolds is known to improve bone ingrowth. The mechanism for the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the …
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Synthesis and characterization of rigid nanoporous hypercrosslinked copolymers for high surface area materials with potential hydrogen storage capabilities
… class of materials termed Polymers of Intrinsic Microporosity (PIMs) which are also based on a "hypercrosslinked" concept. We enchained N-substituted maleimide and functionalized stilbene alternating copolymers into a "hypercrosslinked system" to achieve high rigidity, high surface areas, high …
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Engineering Dynamic Granular Composites for the Repair of Cartilage Tissue
… and guiding tissue formation through microporosity and microgel properties. This thesis developed granular composites, which are mixtures of MSC spheroids and engineered hyaluronic acid (HA) microgels, to address the limitations in the use of MSC spheroids for biomedical applications. …
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Intercalation d'anions organiques dans des composés lamellaires de type hydrotalcite.
… The products thus obtained exhibited significant microporosity and were stable up to 450$\sp\circ$C. Furthermore, for the intercalation of dicarboxylic acids by anionic exchange of chloride in the mixed Zn-Al hydroxide system, it was shown by careful infrared analysis, that despite the tilted …
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Polymer molecular sieve membranes
… microporous polymers, polymers of intrinsic microporosity (PIMs). Using the PIM-1 polymer as a prototype, we discovered that ultraviolet irradiation of PIM-1 membranes in the presence of oxygen induces oxidative chain scission at the surface, resulting in local densification and structural …
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Small molecule motion within and through organic nanomaterials: an anthology
… guanidinium-functionalized polymer of intrinsic microporosity (PIM-G) membrane. PIM-G shows high permselectivity towards CO₂ over CH₄, N₂, and O₂, and selectivity was further improved by exchanging the polymer’s default Cl− counterion with larger halides. This halide exchange-driven selectivity …
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