Metal-organic framework (MOF)-derived porous metal/C composites have drawn considerable attention from the microwave absorption field owing to their large pore volumes and surface areas. Exploring single-MOF-derived materials with high intensity and broadband absorption is largely needed but remains a challenge. Here, porous Co/ZnO/C (CZC) microrods were fabricated easily from cuboid-shaped heterobimetallic MOFs. CZC provides an efficient platform for integrating different semiconductors (ZnO), magnetic metal (Co), and carbon sources into one particle, which enhances the electromagnetic (EM) wave-absorbing ability. The carbonization temperature which is critical for EM parameters was studied in detail. CZC annealed at 700 °C outperformed those obtained at 600 or 800 °C in terms of microwave wave-absorbing properties. The reflection loss (RL) was optimized to -52.6 (or -20.6) dB at 12.1 (or 14.8) GHz with an effective bandwidth (RL ≤ -10 dB) of 4.9 (or 5.8) GHz at the coating thickness of 3.0 (or 2.5) mm. Such enhancement of EM wave-absorbing capabilities is ascribed to the well-built porous structure, dielectric loss, and magnetic loss. This work offers a new way to prepare porous magnetic metal/C composites with excellent microwave-absorbing properties starting from heterobimetallic MOFs.

Lightweight and compatible metal–organic framework (MOF)-derived carbon-based composites are widely used in electromagnetic (EM) absorption. Their combination with laminated TiO2-C (derived from Ti3C2T x ) is expected to further strengthen the EM attenuation ability. Herein, novel laminated Co/TiO2-C hybrids were derived from Ti3C2T x /Co-MOF using heat treatment. Compared with pristine MOF-derived carbon-based composites, the EM absorption ability of Co/TiO2-C was improved by multiple reflections between multilayered microstructures and the improved polarization loss (due to the heterogeneous interfaces, residual defects, and dipole polarization) and the strengthened conductivity loss caused by the carbon layers. Specifically, for the Co/TiO2-C hybrids at thicknesses of 3.0 and 2.0 mm, the optimal reflection loss (RL) was −41.1 dB at 9.0 GHz and −31.0 dB at 13.9 GHz, with effective bandwidths (RL ≤ −10 dB) of 3.04 and 4.04 GHz, respectively. This study will underline the preparation of carbon-based absorbing materials starting from MXene/MOF hybrids.

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A great deal of interest has arisen recently with respect to human mesenchymal stem cells (MSCs), due to their broad therapeutic potential. However, the safety and efficacy of MSCs expanded ex vivo for clinical applications remain a concern. In this article, we establish a standardized process for manufacture of human umbilical cord-derived MSCs (UC-MSCs), which encompasses donor screening and testing, recovery, two-stage expansion, and administration. The biological properties and safety of UC-MSCs were then characterized and tested. The safety data from use in human patients have also been reported. After clinical-scale expansion, a yield of 1.03-3.78 × 10(8) MSCs was achieved in 10 batch manufacturing runs. The biological properties, such as plastic adherence, morphology, specific surface antigen (CD105, CD73, CD90, positive ≥ 95%; CD45, CD34, CD31, CD11b, CD19, HLA-DR, negative ≤2%), and multipotent differentiation potential (osteogenesis and adipogenesis) were retained. Bacterial and mycoplasma tests were negative and endotoxin levels were lower than 2 EU/ml. No adverse events were noted in two patients treated with intravenously and/or intrathecally administered MSCs. The data obtained indicate that banking UC-MSCs for clinical use is feasible.

Tunable and high-efficiency electromagnetic wave (EMW) absorption materials composed of a threedimensional (3D) hierarchical reduced graphene oxide (RGO) aerogel network entrapped with TiO 2 /Ti 3 C 2 T x hybrids were fabricated by a hydrothermal method and a mild chemical reduction treatment. The incorporation of the TiO 2 /Ti 3 C 2 T x micronanoheterostructure and construction of the 3D welldesigned hierarchical interconnected network can significantly reduce the agglomeration of RGO sheets together with the beneficial effect of a better impedance match. When the filler loading is 10 wt %, the maximum reflection loss of the composite aerogel reaches up to −65.3 dB with a matching thickness of 2.5 mm. Meanwhile, the effective absorption bandwidth (RL < −10 dB) is 4.3 GHz with the coating thickness of only 2.0 mm, and the tunable absorption bandwidth achieves at 13.74 GHz via modulating the absorber thicknesses in a range from 1.5 to 5.0 mm. The enhanced EMW absorbing performance is closely related to highly porous conductive networks, better impedance match, multiple reflection, and scattering and defective polarization properties. Consequently, these results indicate a promising route to fabricate a lightweight, thin thickness, highly efficient, and broadband EMW absorber, which can facilite the control and purification of the EM environment and realize the sustainable utilization of EMW.