We have used self-assembled monolayers (SAMs) prepared from omega-terminated alkanethiols on gold to generate model surfaces and examine the effect of surface composition on the adsorption of Photosystem I (PSI), stabilized in aqueous solution by Triton X-100. Triton-stabilized PSI adsorbs to high-energy surfaces prepared from HO- and HO2C-terminated alkanethiols but does not adsorb to low-energy surfaces. The inhibition of PSI adsorption at low-energy surfaces is consistent with the presence of a layer of Triton X-100 that adsorbs atop the hydrophobic SAM and presents a protein-resistant poly(ethylene glycol) (PEG) surface. While the presence of the PEG surface prevents the adsorption of PSI, the displacement of the inhibiting layer of Triton X-100 by dodecanol, a more active surfactant, greatly enhances the adsorption of PSI. This inhibiting effect by Triton X-100 can be extended to other protein systems such as bovine serum albumin.
This work probes the effects of La on reactions involving CuO sorbents and H2S in gaseous streams. La‐CuO sorbents with nominal La/Cu atomic ratios of 1:2 achieved higher capacities (27 and 36 g H2S per 100 g sorbent) compared to CuO sorbents (25 g H2S per 100 g sorbent). Comparison of the La‐CuO sorbents using energy dispersive x‐ray spectroscopy and La L3‐edge XAS suggested that increased capacity resulted from more uniform dispersion of La within the CuO phase (3.3 wt.% vs. 1.0 wt.% La). X‐Ray absorption near edge structure analysis suggested more electron‐rich Cu species in La‐CuO samples, while extended X‐ray absorption fine structure modeling showed an increase in single‐scattering path lengths for neighboring and near‐neighbor atoms. These changes suggest that La induces strain in the Cu‐O lattice, thereby increasing H2S capacity by reducing energy barriers associated with surface reactions between oxygen atoms and adsorbed H2S molecules.
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