A5067974844- Gas Sensing Nanomaterials and Sensors
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Calcium Carbonate Crystallization and Inhibition
- Advanced ceramic materials synthesis
- Mesoporous Materials and Catalysis
- Catalytic Processes in Materials Science
- Concrete and Cement Materials Research
The University of Texas at Austin
2022-2023
Walker (United States)
2022
North Carolina Agricultural and Technical State University
2021
With the increased demand for hand-held and ambient gas sensors, it is imperative to develop sensors that can offer both selective sensitive detection. Gas preconcentration a widely tried tested method increase sensitivity of detectors. While effectively lowers limit detection, does not impact selectivity detector. Therefore, preconcentrator materials have mostly been used in conjunction with In this work, we use nonselective small portable photoionization detector introduce selectivity. For...
Adsorption-desorption behaviors of polar and nonpolar volatile organic compounds (VOCs), namely, isopropanol nonane, on mesoporous silica were studied using optical reflectance spectroscopy. Mesoporous was fabricated via electrochemical etching silicon subsequent thermal oxidation, resulting in an average pore diameter 11 nm a surface area approximately 493 m2/g. The thickness the porous layer, which is proportional to number adsorbed molecules, measured visible light interferometry. In situ...
The complex composite material cement paste (CP) is under high pressures in underwater applications and when impact loading occurs. mechanical behavior of to hydrostatic compression results from deformations each phase, including unhydrated hydrated minerals. Molecular Dynamics was used study the atomistic deformation individual phases with increasing pressures. pressure-specific volume Birch-Murnaghan equation state (EoS) bulk modulus at zero pressure were determined for phase. Results show...
The adsorption of gas-phase volatile organic compounds into porous materials is the key interaction governing preconcentrator technology, in which adsorbed molecules are concentrated and then desorbed a sharp pulse for detection. Reliable detection by small, portable, inexpensive sensors continues to present significant challenge; preconcentration promising method address this problem. By adding device an existing sensor, its sensitivity limit can potentially be significantly improved. Here,...