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   Musselman, Matthew A. ; Wilkinson, Taylor M. ; Haberl, Bianca ; Packard, Corinne E. ( January 2018 , Journal of the American Ceramic Society)
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   https://doi.org/10.1002/pol.20200220  

   Hu, Leiqing ; Pal, Sankhajit ; Nguyen, Hien ; Bui, Vinh ; Lin, Haiqing ( July 2020 , Journal of Polymer Science)

   Over the last two decades, polymers with superior H₂/CO₂separation properties at 100–300 °C have gathered significant interest for H₂purification and CO₂capture. This timely review presents various strategies adopted to molecularly engineer polymers for this application. We first elucidate the Robeson's upper bound at elevated temperatures for H₂/CO₂separation and the advantages of high‐temperature operation (such as improved solubility selectivity and absence of CO₂plasticization), compared with conventional membrane gas separations at ~35 °C. Second, we describe commercially relevant membranes for the separation and highlight materials with free volumes tuned to discriminate H₂and CO₂, including functional polymers (such as polybenzimidazole) and engineered polymers by cross‐linking, blending, thermal treatment, thermal rearrangement, and carbonization. Third, we succinctly discuss mixed matrix materials containing size‐sieving or H₂‐sorptive nanofillers with attractive H₂/CO₂separation properties.

    

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3. Rearrangement of a Ge( ii ) aryloxide to yield a new Ge( ii ) oxo-cluster [Ge 6 (μ 3 -O) 4 (μ 2 -OC 6 H 2 -2,4,6-Cy 3 ) 4 ](NH 3 ) 0.5 : main group aryloxides of Ge( ii ), Sn( ii ), and Pb( ii ) [M(OC 6 H 2 -2,4,6-Cy 3 ) 2 ] 2 (Cy = cyclohexyl)

   https://doi.org/10.1039/D3DT00906H  

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   Spontaneous Ge₆O₈cluster formation under ambient conditions using dispersion enhanced aryloxo ligands.

    

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   Separation of higher hydrocarbons from methane is an important and energy‐intensive operation in natural gas processing. We present a detailed investigation of thin and oriented MFI zeolite membranes fabricated from 2D MFI nanosheets on inexpensive α‐alumina hollow fiber supports, particularly for separation ofn‐butane, propane, and ethane (“natural gas liquids”) from methane. These membranes display high permeances and selectivities for C₂–C₄hydrocarbons over methane, driven primarily by stronger adsorption of C₂–C₄hydrocarbons. We study the separation characteristics under unary, binary, ternary, and quaternary mixture conditions at 298 K and 100–900 kPa feed pressures. The membranes are highly effective in quaternary mixture separation at elevated feed pressures, for example allowingn‐butane/methane separation factors of 170–280 andn‐butane permeances of 710–2,700 GPU over the feed pressure range. We parametrize and apply multicomponent Maxwell–Stefan transport equations to predict the main trends in separation behavior over a range of operating conditions.

    

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5. The role of indium composition in InxGa1−xN prestrained layer towards optical characteristics of EBL free GaN / InGaN nanowire LEDs for enhanced luminescence

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   In this work, an electron blocking layer (EBL) free light emitting diode (LED) nanowire is proposed with alternate prestrained layers of In_xGa_1−xN/GaN, which are inserted between the GaN/InGaN multi‐quantum wells (MQWs) and n‐GaN layer. This study signifies the role of prestrained layers on the piezoelectric polarization of LED nanowires, for enhanced luminescence. When compared with the conventional one, the EBL free LED nanowire with prestrained layer shows an enhancement of ~2.897% efficiency, which occurs due to the reduction of polarization field in the active region. The LED with 15% indium in the prestrained layer obtains a maximum efficiency of 85.21% along with a minimum efficiency droop of 3.848% at 40 mA injected current. The proposed III‐nitride LED nanostructure allows for achieving superior optical power across the output spectral range.

    

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