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 21 for “"Shear Rheology"”.
-
PMMA Clay Nanocomposites
… electron microscopy (TEM) and oscillatory shear rheology. Morphological studies of the PCN showed that the extent of clay dispersion depended on the clay type. Within the PMMA/Laponite RD nanocomposites an unusual network structure was formed, which appeared to be continuous throughout the …
-
Structure and Property Evolution During Film Formation From Binary Colloidal Suspensions
… composition of Al2O3:latex were studied by shear rheology, direct visualization, and a controlled environment stress measurement device. Their low shear viscosity was nearly independent of alumina:latex ratio for binary mixtures, whose particle size ratio (D¯ alumina:D¯latex) …
-
PHYSICAL CHEMISTRY OF COLLOIDAL-NANOPARTICLE INTERACTIONS
… as determined by light scattering, steady state shear and small angle oscillatory shear rheology. Tunable rheology was attributed to the physiochemical interactions of disordered fractal microstructures that are formed via spontaneous, non-directional and random complexation. The thermodynamic …
-
Synthesis and Solution Properties of Semi-rigid Polyelectrolytes and Polyampholytes
… organic-soluble polymer precursors. Solution shear rheology and statistical segment length measurements reveal that carboxylated polyanions containing stilbene and maleic acid remain semi-rigid in aqueous solutions. It was found that these semi-rigid polyanions exhibited excellent anti-HIV …
-
A foe-inspired friend: Constructing a tumor tissue-mimicking biomaterial to study intratumoral drug transport
… typically are rich in collagen I fibers. Using shear rheology, tumors with lower collagen density were shown to have a lower stiffness. Similarly, the stiffness of the hyaluronic acid hydrogel models was increased with the addition of collagen fibers to model the bulk biomechanical properties of …
-
An Experimental Study on the Effects of Heat and Chemical Inhibitors on the Flow Behaviour of Waxy Crude Oils. The Effects of Heat and Chemical Inhibitors on the Rheological Properties of Waxy Crude Oils with regard to Pumping in Pipelines
… (CPM), controlled stress and oscillatory shear rheology (CSR and OSR), the principal parameters being the crude temperature and the rate at which the crude was cooled. GC and DSC were useful in establishing wax composition, content and wax appearance temperature (WAT). Control stress …
-
Biphasic Nanoparticle Inks for Direct Write Assembly of Three-Dimensional Periodic Structures
… of these biphasic mixtures were measured through shear viscometry, oscillatory shear rheology, and compressive rheology. Biphasic mixtures have shear elastic properties intermediary between repulsive glasses and attractive gels, yet the scaling of their elastic properties with respect to volume …
-
Flow-Induced Self Assembly in Micellar Fluids with Applications to Nanomanufacturing
Structure and rheology of surfactant solutions are very sensitive to electrostatic interactions and flow deformation. The objectives of this experimental study have been to uncover the essential physics of structure transitions in surfactant solutions under simple shear as well as porous medium …
-
Material Extrusion based Additive Manufacturing of Semicrystalline Polymers: Correlating Rheology with Print Properties
… The melt flow behaviour is characterized using rheology and its effect on the interlayer adhesion of printed parts and print precision is explored. The extent of polymer chain re-entanglement post deposition on the printer bed is quantitatively determined using interrupted shear rheology …
-
Implications of Nanofiber Length and Polydispersity on Flow Alignment
… insight into their colloidal behavior, shear response, and alignment mechanisms remain limited. Additionally, few experimental techniques can probe nanoscale orientation under dynamic conditions, making it difficult to correlate rheological properties with shear-induced alignment. This …
-
Effect of Dairy Cow Diets on the Composition and Processing Characteristics of Milk
… the use of a novel technique called cavitation rheology (CR) to measure the mechanical properties of Mozzarella cheese, produced from GRO milk, during ageing at 4 °C. The linear modulus (E) obtained from CR was much lower when compared G′ (storage modulus) from shear rheology, but correlated …
-
Micro-injection moulded microneedles for drug delivery.
… microneedles with acceptable quality. Hence high shear rheology of these selected materials was performed at wall shear rates carried out in excess of 107 s-1 over a range of temperatures to predict the flow behaviour of polymer melts at such high shear strain rates. This information was fed into …
-
Mechanical characterization of mammalian brain tissue and energy dissipative polymers
… conventional characterization techniques such as shear rheology, several challenges arise when the material of interest has stiffness on the order of 1 kPa or lower, as is the case with brain tissue, largely due to difficulties detecting initial contact with the compliant sample surface. In …
-
Interfacial rheology of globular proteins
… In this thesis, a comprehensive study of the rheology of a model globular protein solution is described. In conventional bulk rheological studies of globular protein solutions a yield-like behavior and shear thinning in the viscosity at low shear rates is observed, even for concentrations as …
-
THE DEVELOPMENT OF ALTERNATIVE STRATEGIES FOR USING CHEMICAL OXIDIZING AND REDUCING AGENTS IN FLOURS AS A MEANS OF CONTROLLING GLUTEN STRENGTH PRIOR TO DEVELOPING DOUGH
… quality, grain and flour composition, and dough rheology. The cultivars varied in proximate composition which in turn directly impacted their dough handling. MicrodoughLAB absorption was found to be positively correlated with protein content, grain hardness, wet gluten and dry gluten content, and …
-
Thermorheology and processing of polyethylene blends : macromolecular structure effects
… added by the LDPE component. On the other hand, shear rheology was found to be insensitive to detect addition of small levels of LDPE up to lwt%. The second set of blends prepared and studied consisted of two Ziegler-Natta LLDPE's (LL3001.32 and Dowlex2045G) and two metallocene …
-
Tunable viscoelasticity, morphology, and charge transport of dynamic covalent polymers
… characterized by 11B solid-state NMR. Shear rheology demonstrated that networks containing only neutral crosslinks exhibited a single damping peak associated with the glass transition Tg. On the other hand, the incorporation of ionic crosslinks introduced an additional damping mode with …
-
An investigation of the role of mucin gels in disease progression and transmission
… hosts or remain in the environment. The high shear rates associated with violent exhalations cause respiratory mucus to fragment into droplets spanning a range of sizes. Once emitted, droplets are propelled to nearby surfaces or entrained and advected in ambient air flows. Larger droplets may …
-
Micro- and macro-rheological studies of the structure and association dynamics of biopolymer gels
… reconstituted mucin gels using micro- and macrorheology in order to gain insight into how environmental factors, including pathogens and therapeutic agents, alter the mechanical properties of fully-constituted mucus. We find that analyses of thermal fluctuations on the length scale of …
-
The Role of Branching Topology on Rheological Properties and its Effect on Film-Casting Performance
… performance. The work includes analysis of the rheology in shear and shear-free flows for sparsely long-chain branched, LCB, polyethylene, PE, resins; determination of the consistency of the molecular based constitutive model, the pom-pom model; for these flows, and evaluation of the same PE …
Page 1 of 2