The concentrations of the redox pair hydrogen peroxide (HO) and oxygen (O) can promote or decelerate the progression and duration of the wound healing process. Although HO can reach critically high concentrations and prohibit healing, a sufficient O inflow to the wound is commonly desired. Herein, we describe the fabrication and use of a membrane that can contemptuously decrease HO and increase O levels. Therefore, hematite nanozyme particles were integrated into electrospun and cross-linked poly(vinyl alcohol) membranes. Within the dual-compound membrane, the polymeric mesh provides a porous scaffold with high water permeability and the nanozymes act as a catalyst with catalase-like activity that can efficiently convert HO into O, as shown by a catalase assay. When comparing the growth of fibroblasts at an HO concentration of 50 μM, the growth was largely enhanced when applying the nanozyme dressing. Thus, application of the nanozyme dressing can significantly reduce the harmful effect of higher HO concentrations. The described catalytic membranes could be used in the future to provide an improved environment for cell proliferation in wounds and thus applied as advanced wound healing dressings.
AAg 2 M[VO 4 ] 2 with A = Sr 2+ or Ba 2+ present a series of layered compounds featuring a triangular lattice of transition metal cations, M = Co 2+ or Ni 2+ , connected via nonmagnetic ortho-vanadates, which provide the magnetic superexchange within the layers. For this series of insulating compounds, ferromagnetic long-range order below 10 K is suggested by magnetization and specific heat measurements and confirmed by neutron diffraction experiments. We have investigated the impact of the spacer size of A 2+ separating the layers leading to a tilting of the vanadates and consequently inducing a change in the effective magnetic correlations. Magnetization and specific heat measurements corroborate the important dependence of the magnetic superexchange on the orientation of the vanadates and the respective spin system. Furthermore, the ground state properties of the spin systems, S = 1 (Ni 2+ ) and S = 3/2 (Co 2+ ) in their respective octahedral coordination of oxygen, are evaluated. Calculated magnetic moments of the single ion complexes agree well with the magnetic structure. We, furthermore, report the dependence of T c on applied isotropic pressure suggestive of a pressure effect on the effective ferromagnetic exchange coupling constants. In addition spectroscopic investigations probing the electronic structure of the [MO 6 ] complexes and the vibrational structure of the [VO 4 ] units are given.
The effect of surface functionalization on the structural and magnetic properties of catechol-functionalized iron oxide magnetic (γ-Fe2O3) nanocrystals was investigated.
Surface functionalized ZrO2 nanoparticles show strong photoluminescence and are a versatile tool for cellular targeting due to their chemical functionality.
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