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Showing 1 to 20 of 70 for “"rheometry"”.
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Precision rotational rheometry
For rotational rheometers, alignment of rotating surfaces is of prime importance in conducting accurate, reproducible measurements. A custom glass bottom surface has been designed and fabricated that has < 1 µm of planar misalignment with respect to the instrument axis of rotation. This also …
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Capillary rheometry of soy isolate dough
Viscosity of 30 and 48% soy isolate (Promine-D) dough is determined using an Instron capillary rheometer at 298K, 333K and 363K. Thermal transitions of 10 to 100% soy isolate dough are measured using a Perkin-Elmer Differential Scanning Calorimeter (DSC-2) over 310 to 350K. The observed behavior of …
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Improvements in Powder Rheometry Through Novel 3D Printed Tools
Powders and other granular media are used in a variety of industries, including pharmaceutical manufacturing, 3D printing, food production, construction, and more. As such, understanding the frictional rheological behavior of granular media is of great interest. We present a novel testing paradigm …
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Rheometry and direct flow observations of a model wax-oil system
… study of the model fluid using Flow Assurance Rheometry. The data from this combined approach shows that the model fluid exhibits a complex behavior due to heterogeneities within the domain of the fluid. Specifically, the wax-oil system is shown to consist of two distinct phases: rigid clumps …
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On-line shear and extensional rheometry of polymer melts in the extrusion process.
… screw extrusion (TSE). Comparisons with off-line rheometry were made using a twin-bore capillary rheometer and a modular in-line slit die rheometer (ILR) provided in-line rheometry comparisons. Both capillary rheometers were controlled via PCs running dedicated software, and the extrusion line and …
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On-line shear and extensional rheometry of polymer melts in the extrusion process.
… screw extrusion (TSE). Comparisons with off‑line rheometry were made using a twin‑bore capillary rheometer and a modular in‑line slit die rheometer (ILR) provided in‑line rheometry comparisons. Both capillary rheometers were controlled via PCs running dedicated software, and the extrusion line and …
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Soft hydrated sliding interfaces as complex fluids
… an aluminum annulus using stepped-velocity tribo-rheometry over 5 decades of sliding speed in increasing and decreasing steps. We postulate that the mechanisms of hydrogel-against-hard material lubrication are due to distinct complex fluid behavior characterized by weakly or strongly …
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INVESTIGATING RHEOLOGICAL TECHNIQUES TO MODEL AND PREDICT OPERATING CONDITIONS OF A SINGLE SCREW EXTRUDER WITH INTERNAL RESTRICTIONS
… extrusion conditions. Both off-line capillary rheometry and in-line extruder fed rheometry techniques have been used to model rheology of materials during extrusion. Investigations on use of an off-line capillary rheometer to model apparent viscosity of full fat soy flours revealed inability of …
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EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL
… tension tests and small strain torsional rheometry tests were performed at different rates in a temperature range of 13 to 50 Celsius. The rheometry data show that time-temperature superposition can be used to condense the data to a master curve. It is found that by allowing the model …
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Taking Magnetic Resonance into Industrial Applications
… is typically performed using conventional rheometry methods operating offline, with an online, or inline, method sought for process control and optimisation. Until recently, MR was an unlikely choice for this application due to the requirement of high-field MR hardware. However, recent …
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Evaluation of Phenol Formaldehyde Resin Cure Rate
… adhesives. Two methods are used, parallel-plate rheometry and dielectric spectroscopy. Viscosity data from a parallel-plate rheometer may be used to track the advance of polymerization as a function of temperature. This data can then be used to optimize press conditions and reduce production …
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Microscopic characterization of macroscopic colloidal gel rheology
… a model colloidal gel via optical microscopy and rheometry. We employ differential dynamic microscopy to quantify the thermal fluctuations of the gel network across multiple length and timescales and rotational rheometry to characterize macroscopic strain and stress responses under shear. Use of …
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Quantitative estimates of mechanical properties from in vivo tumors of rodent animals
… modulus. Subsequently, tumors were excised for rheometry testing to independently validate coefficient estimates and later histologically processed to evaluate tumor type. Four benign mammary fibroadenomas (2-4 cm diameter), one benign lobular hyperplasia (3 cm diameter) and four 4T1 cell line …
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Microrheology and microstructure of poly(vinyl alcohol)-based physical gels
… properties measured using conventional shear rheometry, and correlate the rheological properties to the structure of the materials. We develop a new technique for investigating the viscoelastic properties of soft materials using the atomic force microscope. The electronic feedback of an atomic …
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Engineering mechanical dissipation in solid poly(ethylene glycol) hydrogels with bio-inspired metal-coordinate crosslinks
… via metal ion coordinated crosslinks. Using rheometry, we study the contribution of the metal-coordinate network to the bulk gels mechanics and find that we can control both the amplitude and the frequency of peak mechanical dissipation with the histidine: metal ion ratio and the choice of …
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Production And Structure/Properties Of Nylon-6 Core / Isotactic Polypropylene Sheath Bicomponent Fibers Suitable For Use In Carpeting Applications
… these materials was obtained using capillary rheometry. A number of analytical techniques including DSC, TGA, and SEM were used to better understand the structure of the maleated materials.
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Characterization of an oxygen suspension used for intravenous infusion
… particle size distribution, oxygen tension, and rheometry. The data collected from the experiments will serve to create a model for delivering a specific volumetric flow rate of the fluid at atmospheric pressure.
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From interfacial nanostructures to advanced constructs: harnessing surfactant self-assembly at liquid interfaces
… properties are evaluated through shear rheometry. Compared to other soft materials explored for LL3DP, bijel-based prints offer unique advantages, including interconnected hydrophobic and hydrophilic domains confined within defined geometries, along with tunable structural and …
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Creation of brain tissue-mimicking material and multi-material gradient 3D printer for magnetic resonance elastography phantom
… stiffness of developed materials was tested with rheometry to verify that the stiffness matched that of brain white matter. Phantom development started with creating a 3D printer to extrude soft materials. The printer was further modified to print two materials separately or in mixed ratios so …
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