Kyushu University · Engineering
Professor Hiroshi Noguchi's research lab specializes in the development and characterization of metal-organic frameworks (MOFs), particularly copper-based MOFs, for gas adsorption and separation applications. The lab focuses on understanding the thermodynamic and kinetic behaviors of gases such as methane, nitrogen, and oxygen in porous materials under various conditions, including supercritical and low-temperature regimes. Key research directions include the investigation of gate-opening phenomena, adsorption isotherms, and the impact of intermolecular interactions on adsorption performance, with applications in gas storage and environmental technologies. The lab also addresses instrumental challenges in real-time gas analysis, such as correcting for mass spectrometer response delays in metabolic measurements.
Figures are computed from collected data and may differ slightly.
Both transport delay (DELAY) and dynamic response (RESPONSE) of a mass spectrometer would theoretically result in considerable errors in the breath-by-breath calculation of VCO2 and VO2. However, curiously, the contribution of RESPONSE has been ignored. The purpose of this study is to quantify the error caused by RESPONSE. We found that RESPONSE of a mass spectrometer was regarded as a first-order response. We determined DELAY and time constant (T) of RESPONSE and compensated the on-line calcula
We measured adsorption and desorption isotherms of methane on [Cu(4, 4'-bipyridine)2(BF4)2] (LPC) at 258, 273, and 303 K. Adsorption proceeds almost vertically at a definite pressure, which is named gate pressure. The lower the measurement temperature, the smaller the gate pressure. The temperature dependence of the gate pressure is expressed by the Clapeyron-Clausius equation, giving a thermodynamic evidence on the clathrate formation between the Cu complex and methane.
The supercritical N2, O2, and CH4 adsorption isotherms on a Cu-based metal−organic framework, [Cu(4,4‘-bipyridine)2(BF4)2]n, over the temperature range of 196−303 K were measured by a gravimetric method. The N2 and O2 adsorption isotherms at 196 K showed a vertical adsorption accompanied by a rectangular hysteresis loop. A method of evaluating the absolute adsorption amount of these gases was developed taking into account the intermolecular interactions for the buoyancy-mediated method. The isot
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