@article{farias_haeri_khan_2021, title={Linking polymer hydrophobicity and molecular interactions to rheology and tribology in phospholipid-containing complex gels}, volume={584}, ISSN={["1095-7103"]}, DOI={10.1016/j.jcis.2020.09.113}, abstractNote={The rheological behavior and frictional properties (macroscopic level) of systems containing a hydrophobically modified polymer and phospholipids depend on the hydrophobic association that occur between the hydrophobic moiety of the polymer and the phospholipid tails (molecular level). The hydrophobicity of the polymer can thus be used to control its interactions with phospholipids, and manipulate complex gel macroscopic behavior. By using systems composed of a crosslinked hydrophobically modified polyacrylic acid (HMPAA) or a crosslinked polyacrylic acid polymer (PAA) and phospholipids, we examine the underlying mechanisms through which the components interact using isothermal titration calorimetry (ITC) and their effect on rheological and tribological characteristics of complex gels. We find the systems containing HMPAA and phospholipid exhibit gel-like behavior with the elastic modulus increasing substantially upon phospholipid addition due to hydrophobic interactions that result in a more interconnected network formation, as evidenced by ITC measurements. Similar experiments with a crosslinked polyacrylic acid polymer (PAA) show no interactions, lending credence to our hypothesis. In addition, soft tribological behavior shows lower friction coefficients at low entrainment speeds with HMPAA concentration and the addition of phospholipid, while no change in friction coefficient was observed in the case of increasing PAA concentration, indicating HMPAA and phospholipids to be interacting with the soft PDMS contacts.}, journal={JOURNAL OF COLLOID AND INTERFACE SCIENCE}, author={Farias, Barbara V. and Haeri, Farrah and Khan, Saad A.}, year={2021}, month={Feb}, pages={134–144} }
 @article{gao_haeri_he_li_2018, title={Alkali Metal-Promoted LaxSr2-xFeO4-delta Redox Catalysts for Chemical Looping Oxidative Dehydrogenation of Ethane}, volume={8}, ISSN={["2155-5435"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85042879284&partnerID=MN8TOARS}, DOI={10.1021/acscatal.7b03928}, abstractNote={Chemical looping oxidative dehydrogenation (CL-ODH) represents a redox approach to convert ethane into ethylene under an autothermal scheme. Instead of using gaseous oxygen, CL-ODH utilizes lattice oxygen in transition metal oxides, which acts as an oxygen carrier or redox catalyst, to facilitate the ODH reaction. The oxygen-deprived redox catalyst is subsequently regenerated with air and releases heat. The current study investigated alkali metal (Li, Na, and/or K)-promoted LaxSr2–xFeO4−δ (LaSrFe) as redox catalysts for CL-ODH of ethane. While unpromoted LaSrFe exhibited poor ethylene selectivity, addition of Na or K promoter achieved up to 61% ethane conversion and 68% ethylene selectivity at 700 °C. The promotional effect of K on LaSrFe was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), low-energy ion scattering spectroscopy (LEIS), transmission electron microscopy (TEM), O2-temperature-programmed desorption (TPD), H2-temperature-programmed reduction (TPR), and 18O2...}, number={3}, journal={ACS CATALYSIS}, author={Gao, Yunfei and Haeri, Farrah and He, Fang and Li, Fanxing}, year={2018}, month={Mar}, pages={1757–1766} }