Dopamine intranasal(MetP Pharma AG)

Metal-organic frameworks (MOFs) have been widely applied in the field of electromagnetic wave absorption (EMWA) on account of unique morphol., simple fabrication, and ultra-high porosity.Nevertheless, the facile method of protecting its structure from being destroyed remains challenging.Herein, we proposed a hydrothermal method combined with a carbonization strategy to construct the 0D/1D/2D Fe₃C@NC@Mo₂C/Fe₃C composites.Owing to the incorporation of polydopamine (PDA), the carbon shell formed during high-temperature carbonization effectively protected the original MIL-88A rod-like structure, and the 2D Mo₂C nano-sheets and 1D Fe₃C nanoparticles were coated on the surface of 1D Fe₃C nanorods.With the increase in carbonization temperature, the EMWA properties of the composites presented a trend of first increasing and then decreasing.Impressively, the composites (at 750°C) exhibited praiseworthy EMWA performances with a min. reflection loss value of -43.70 dB at 8.00 GHz, alongside a maximum effective absorption bandwidth of 6.08 GHz (11.20-17.28 GHz).D. functional theory calculations confirmed the distinctive charge distribution resulting from the heterointerface, which is beneficial to the polarization loss and conductive loss.As a result, the outstanding EMWA performance was credited to the distinctive hierarchical structure, appropriate impedance matching, numerous heterogeneous interfaces, and magnetic loss.Moreover, Radar cross-section calculations indicated that the composites have tremendous potential for practical application.Thus, this work may pave new avenues for designing high-performance and structure-controllable absorbing materials.

In response to the growing demand for lithium resources driven by the advancements in high technol., efficient extraction of Li⁺ from brine with a high Mg²⁺/Li⁺ ratio is of great significance.Herein, the interface polymerization process was employed to fabricate the stable monovalent selective cation exchange membranes (MCEMs) and the chem. microenvironment in the membrane separation layer was optimized to increase the selectivity of membrane.The presence of pos. charged groups on the surface or inside the membrane could effectively increase the membrane selectivity, but the membranes with charged groups on the inside have higher cation fluxes than those with charged groups outside.The alternating pos. layers and neg. layers created cascade charged channels on membrane surface, which would effectively increasing energy consumption of charged ions and attenuating the competitive passage effect of lithium and magnesium ions in membranes.The Q-T-Q membrane with optimized charge distribution exhibited significantly improved selectivity for Li⁺/Mg²⁺ (70.59), which was eight times higher than that of the com. CIMS membrane (8.86).The long-term stability experiments and tests in simulated brine also confirmed that the MCEMs prepared by interfacial polymerization have a great potential for application, which will open a new insight for the scale-up preparation of high-performance MCEMs membranes.