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Showing 1 to 20 of 218 for “"Porous Materials"”.
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Charge Transfer Reactions in Porous Materials
Porous materials, such as sol-gels and zeolites, contain nanometer-scale spaces in which molecules are confined, leading to significant changes in their chemical dynamics. In this dissertation, the effects of confinement on chemical behavior are studied. By understanding how the properties of a …
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Study of Porous Materials Incorporating Boronate Esters
… esters as secondary building units to form a porous material. COF-18Å has the ability to store gases, high surface areas, good thermal stability, but is susceptible to hydrolysis. Preliminary results show that the covalent organic frameworks have the ability to be repaired, recycled, and …
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MODELLING PORE-LEVEL PROPERTIES OF POROUS MATERIALS
… model of the pore-space within a porous material. As a result of this project, a much-improved version has been produced. The mercury intrusion curves for the simulated structures now converge automatically onto the experimental curves, so reducing the simulation time from several …
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On Determining Spontaneous Ignition in Porous Materials
… in terms of two key material constants and these materials are related to real incident spontaneous ignition scenarios. The Damkohler number is compared to the critical Damkohler number, value of heat generation at the onset of runaway condition, to determine if spontaneous ignition is likely. …
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Porous Materials Prepared by Ultrasonic Spray Pyrolysis
… approach was used to prepare meso- and macroporous carbons. A variety of carbon morphologies were observed (as indicated by SEM and TEM). Analysis of the carbon precursors using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) suggests that the decomposition …
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Optimising Mass Transfer in Synthetic Porous Materials
The performance of materials is determined by their intricate structures. A primary example can be seen in hierarchically porous materials. Their characteristic multi-level networks facilitate efficient mass transfer through larger pores and increase the specific surface area via smaller branching …
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Nanocharacterization of Porous Materials with Atomic Force Microscopy
… have proven very useful in the investigation of porous nanostructured surfaces. Especially, Atomic Force Microscopy (AFM) has been widely used due to its compatibility with non-conducting surfaces. In particular, AFM often complements other techniques like scanning and transmission electron …
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Vibro-acoustics of porous materials with periodic inclusions
… models exist to study the physical behavior of porous and poro-elastic media, and the most complex ones are based on the definition of more than ten parameters. For example, the theory of poro-elasticity formulated by Maurice Biot allows to take into account the mechanical properties of the …
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The interaction of shock waves with porous materials
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1983
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Latent heat fluxes through nano-engineered porous materials
… atmosphere). Cooling efficacy was assessed for porous membranes with pore diameters ranging from 39 to 14,400 nm, varied in regular increments. Evaporative cooling experiments simulated combined daytime desert solar and metabolic thermal load on humans by heating an evaporation chamber partially …
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Evaluation of Moisture Diffusion Theories in Porous Materials
Moisture transport in building materials is directly responsible for structural damage, as well as poor indoor air quality. For these reasons, the need to understand transfer mechanisms and predict moisture transport through building materials has increased over the last couple of decades. Although …
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Numerical studies of reactive polymer flows in porous materials
… model of reactive polymer flow in heterogeneous porous media. A moment representation of the log-normal polymer molecular weight distribution is used to model polymer as a multi-component species. Three leading moments are used to simulate the polymer transport and reaction processes in a …
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Freeze-Casting For Facile Synthesis Of Novel Porous Materials
Freeze-casting is a method of synthesizing porous materials from mixtures comprised of a dispersed phase (colloidal and/or solutal) and a liquid dispersant, typically water. Cooling the mixture to temperatures below the freezing point of water causes nucleation and growth of ice crystals along the …
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Fracture of porous materials induced by crystallization of salt
The penetration of salt into porous materials is known to have deleterious effects, often resulting in fracture. The damage process begins with a saline solution penetrating the porous network by way of capillary action. This is followed by supersaturation of the saline solution, which may result …
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Electrokinetic salt rejection in hyper-filtration through porous materials.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1974. Ph.D.
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Hierarchical Templates and Their Application to Multimodal Porous Materials Fabrication
Hierarchical materials offer great promise for high-performance sensors and catalysis carriers. Well-defined hierarchically porous materials are promising candidates for a wide range of applications relating to biosensors, separations, drug delivery, surface-enhanced Raman scattering (SERS), etc. …
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