Rapid curing and self-stratifying lacquer coating with antifouling and anticorrosive properties

Abstract

We report on the structure and dynamics of a Cu2+-complexed arachidic acid (AA) monolayer formed by Langmuir–Blodgett (LB) deposition. Infrared reflection–absorption spectroscopy (IRRAS) was used to characterize aliphatic chain −CH2 symmetric and asymmetric stretching modes and determine the chain tilt angle and order as a function of subphase pH. Monolayer structure is controlled by metal ion–amphiphile interactions. At low subphase pH (<5), film buckling at high surface pressure is observed, while for high subphase pH (≥5), monolayer buckling is not observed. This finding is correlated to monolayer structural mediation by metal ion–amphiphile interactions. Dynamics and mobility of a fluorophore incorporated into the monolayer were also affected by Cu2+–AA interactions, determined by fluorescence recovery after photobleaching (FRAP) measurements. These data are consistent with the formation of a rigid film due to Cu2+ coordination to AA headgroups, with the extent of headgroup protonation being determined by the pH of the subphase during monolayer deposition. Link:https://pubs.acs.org/doi/10.1021/acs.langmuir.1c00849 5. Name:Consequences of the exposure to bisphenol A in cell membrane models at the molecular level and hamster ovary cells viability Authors: Mateus D. Maximino , Carla Y. Silva a, Dalita G.S.M. Cavalcante , Cibely S. Martin, Aldo E. Job , Osvaldo N. Oliveira Jr , Priscila Al ́essio Journal:Colloids and Surfaces B: Biointerfaces DOI: 10.1016/j.colsurfb.2021.111762 Abstract:The inadequate disposal and the difficulty in its removal from water treatment systems have made the endocrine disruptor bisphenol A (BPA) a significant hazard for humans and animals. The molecular-level mechanisms of BPA action are not known in detail, which calls for systematic investigations using cell membrane models. This paper shows that BPA affects Langmuir monolayers and giant unilamellar vesicles (GUVs) of 1,2-dipalmitoyl-sn-glycero-3phosphocholine (DPPC) used as membrane models, in a concentration-dependent manner and with effects that depend on BPA aggregation. BPA increases DPPC monolayer fluidity in surface pressure isotherms upon interacting with the headgroups through hydrogen bonding, according to polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS). In DPPC GUVs, BPA induced wrinkling and distortion in the spherical shape of the vesicles, but this was only observed for fresh solutions where it is not aggregated. BPA also decreased the viability of hamster ovary cells (CHO) in in vitro experiments. In contrast, aged, aggregated BPA solutions did not affect the GUVs and even increased CHO viability. These results may be rationalized in terms of size-dependent effects of BPA, which may be relevant for its endocrine-disrupting effects. Link:https://www.sciencedirect.com/science/article/pii/S092777652100206X 6. Name:Self-assembled photo-responsive black phosphorus-azobenzene composite Langmuir films with chemical gas sensor and photoelectric conversion applications Authors:Na Li, Ran Wang, Chongling Wang, Jing Gao, Zhiwei Liu, Jianmin Gu, Tifeng Jiao