Lung Surfactant Displacement during Inflammation Alters the Interfacial Tension and Dilatational Modulus
AIChE Annual Meeting
2023
2023 AIChE Annual Meeting
Engineering Sciences and Fundamentals
Soft and Active Systems
Wednesday, November 8, 2023 - 12:00am to 12:15am
From inelastic collisions between the energetic electrons and gas molecules, non-thermal plasma (NTP) produces reactive chemical environments (e.g., electrons, ions, radicals, and vibrationally-excited molecules) at temperatures where such species are thermally inaccessible. Integrating reactive NTP with heterogeneous catalysis has recently gained interest to enhance catalytic activities/selectivities and promote a novel chemical transformation that neither plasma nor catalysis could deliver individually. To better control plasma-catalyst coupling, it is important to understand the interaction between the NTP-activated species and a catalytic surface. In this work, we utilized a multi-modal spectroscopy tool combining polarization-modulation infrared reflection-absorption spectroscopy (PM-IRAS), optical emission spectroscopy (OES), and mass spectrometry (MS) to investigate the interaction between NTP-activated CH4/N2 species and model surfaces (Ni, Pd, Cu, Ag, Au, and SiO2) for C-N coupling. To minimize the plasma-phase interaction between CH4 and N2, we introduce CH4/N2 feed gas sequentially: (1) CH4-N2 in sequence and (2) N2-CH4 in sequence. We show that different sequences lead to CN signatures in OES spectra corresponding to C-N coupled products forming on a catalytic surface. The effects of different surfaces on the nature of surface-adsorbed C-N coupled products are further investigated with ex-situ X-ray photoelectron spectroscopy (XPS) and liquid chromatography-mass spectrometry (LC-MS).