1. Northwestern Polytechnical University Science: New progress in MOF separation of high-purity ethylene. The purification of ethylene (C2H4) is a key process in the chemical industry. Currently, chemical adsorption (CO2 removal), catalytic hydrogenation (C2H2 conversion) and low

1. Northwestern Polytechnical University Science: New progress in MOF separation of high-purity ethylene

The purification of ethylene (C2H4) is a key process in the chemical industry. Currently, chemical adsorption (CO2 removal), catalytic hydrogenation (C2H2 conversion) and low-temperature distillation are mainly used. (C2H6 separation) and other energy-intensive processes. Although physical sorbent or membrane separation technologies may reduce energy input, the step-by-step removal of multiple impurities, especially trace impurities, still leaves many unanswered questions. Kai-Jie Chen of Northwestern Polytechnical University and David G. Madden of the University of Limerick and others synthesized an easily regenerable super-selective microporous MOFs material, and developed a collaborative adsorbent separation method based on MOFs materials, which can make The ternary (C2H2/C2H6/C2H4) or quaternary (CO2/C2H2/C2H6/C2H4) gas mixture is separated step by step in the packed bed, and finally high-purity ethylene is obtained with low energy consumption.

Kai-Jie Chen et al.Synergistic sorbent separation for one-step ethylene purification from a four-component mixture, Science 2019.

https://science.sciencemag.org/content/366/6462/241

2. Science: Using solids Direct electrosynthesis of 20% purity H2O2 aqueous solution

from electrolytes The high-purity direct synthesis of hydrogen peroxide (H2O2) is an important goal in the field of basic chemical engineering. Rice University Wang Huotian's team reported a new strategy to directly electrosynthesize a 20% purity H2O2 aqueous solution using solid electrolytes. This strategy delivers hydrogen (H2) and oxygen (O2) to an anode and cathode, respectively, separated by a porous solid electrolyte, where the electrochemically generated H+ and HO2- recombine to form a pure H2O2 aqueous solution. By optimizing the functional carbon black catalyst to reduce two-electron oxygen, 90% selectivity to pure H2O2 was achieved at current densities up to 200 mA/cm2, which represents an H2O2 yield of 3.4 mmol/cm2/h. (3660 mol/kg catalyst/hour). By adjusting the water flow rate through the solid electrolyte, pure H2O2 solutions with a concentration range up to 20 wt% were obtained, and the catalyst maintained activity and selectivity for 100 hours.

Chuan Xia et al. Direct electrosynthesis of pure aqueous H2O2solutions up to 20% by weight using a solid electrolyte, Science2019.

https://science.sciencemag.org/content/366/6462/226

3. AM Review: High Performance MQW Perovskite Light-emitting diode

Light-emitting diodes (LEDs) based on solution-processed metal halide perovskites have shown great potential for applications in energy-saving lighting and displays. Multiple quantum well (MQW) perovskites simultaneously possess high photoluminescence quantum efficiency and good film morphology and stability, making them highly attractive for high-performance perovskite LEDs. Recently, Wang Nana, Huang Wei, and Wang Jianpu of Nanjing University of Technology reviewed the advantages of MQW perovskite and the progress of MQW perovskite LED. The challenges and future development directions of perovskite LEDs are also discussed.

Wang, N. Huang, W. Wang, J et al. Multiple‐Quantum‐Well Perovskites for High‐Performance Light‐EmittingDiodes. AM 2019.

DOI: 10.1002/adma.201904163

https://onlinelibrary.wiley.com/doi /pdf/10.1002/adma.201904163

4. AM: Revealing the active origin of electrocatalytic oxygen evolution reaction of isolated Ni atoms supported on N-doped carbon base

Exploring high-efficiency electrocatalysts for oxygen evolution reaction (OER) and revealing their activity Source is critical to energy conversion technology. Recently, Nanyang Technological University in Singapore Lou Xiongwen and others reported an electrocatalyst with high-efficiency OER under alkaline conditions in which Ni sites are atomically distributed on an N-doped hollow carbon matrix.

Experiments found that by optimizing the coordination geometry of the active Ni site, a significant increase in activity can be observed. X-ray absorption spectroscopy studies and DFT calculation results indicate that effective electronic coupling through Ni-N coordination can lower the Fermi level and reduce the adsorption energy of the intermediate, thereby promoting OER kinetics.

HuabinZhang, Xiong Wen (David) Lou*, et al. Unveiling the Activity Origin ofElectrocatalytic Oxygen Evolution over Isolated Ni Atoms Supported on a N‐Doped Carbon Matrix. Adv. Mater. 2019,

DOI: 10.1002/adma.201904548

https: //onlinelibrary.wiley.com/doi/10.1002/adma.201904548

5. AM: Using polydopamine-encapsulated core-shell upconversion nanoparticles to activate anti-tumor immunity and anti-tumor metastasis

Synergistic optical therapy can effectively overcome tumors Heterogeneity and complexity, so it has a better cancer treatment effect than single-modal photodynamic therapy (PDT) or photothermal therapy (PTT). However, previous methods that combined PDT and PTT were mainly focused on treating primary tumors and ignored the process of tumor metastasis. Professor Liu Bifeng of Huazhong University of Science and Technology, Shenzhen University Dr. Wang Yu and Professor Liu Xiaogang collaborated to prepare an upconversion-polymer hybrid nanoparticle, and loaded the photosensitizer Ce6 on its surface to achieve combined treatment of PDT and PTT. The strategy can not only treat the primary tumor but also combat tumor metastasis by activating anti-tumor immune responses.

Research shows that upconversion materials on a polymer core can ensure sufficient light absorption to generate reactive oxygen species under a single near-infrared light irradiation, and that this synergistic optical treatment can also induce a systemic anti-tumor immune response, Combining it with immune checkpoint blockade therapy can effectively inhibit tumor recurrence and metastasis in tumor-bearing mice in two tumor metastasis models, and prolong the survival of tumor-bearing mice.

shuttle . com/doi/10.1002/adma.201905825

6. AM: Nanosubstrates for the detection and characterization of circulating rare cells and their clinical applications

Circulating rare cells in blood are of great significance for both materials research and clinical applications. For example, circulating tumor cells (CTCs) have been shown to be a useful biomarker for tumor liquid biopsies, while circulating fetal nucleated cells (CFNCs) can be used for non-invasive prenatal diagnosis. However, since the abundance of circulating rare cells in blood cells is extremely low, how to isolate and detect them remains very challenging. Substrates with nanostructures can enhance cell adhesion by providing local interactions, and their larger surface areas can also be connected to capture agents to further improve the efficiency, purity, sensitivity, and reproducibility of capturing cells.

Professor Ke Zunfu of Sun Yat-sen University, Dr. Yazhen Zhu and Professor Hsian-Rong Tseng of the University of California collaborated to introduce the relevant research on nanostructured substrates for the detection and characterization of circulating rare cells (such as CTC/CFNC), and gave an introduction to this technology. The application prospects in disease diagnosis, prognosis prediction and dynamic monitoring of treatment response are prospected.

JiantongDong, Zunfu Ke, Yazhen Zhu, Hsian-Rong Tseng. et al. Nanostructured Substrates for Detection and Characterization of Circulating Rare Cells: From MaterialsResearch to Clinical Applications. Advanced Materials. 2019

DOI:10.1002/adma.201903663

https://onlinelibrary. wiley.com/doi/10.1002/adma.201903663

7. AM Review: Designing and developing materials for delivering siRNA in vivo

RNA interference (RNAi)-mediated gene therapy with FDA approval of first siRNA-derived therapeutic It has also begun to move from basic research to clinical practice. The main difficulty facing RNAi therapy is to achieve effective delivery of oligonucleotides.

Michael J. Sailor’s team at the University of California reviewed the key requirements for designing and developing materials for delivering siRNA in vivo, including: (1) the carrier can protect siRNA from degradation and clearance; (2) it can be selectively targeted to the target cells; (3) Able to escape or bypass endocytic uptake to achieve cytoplasmic release of siRNA; subsequently, different types of carrier materials (lipids, polymers, metal-based materials, mesoporous silica, etc.) A summary is provided and the development direction of RNAi therapy is prospected.

ByungjiKim, Michael J. Sailor. et al. Rekindling RNAi Therapy: Materials DesignRequirements for In Vivo siRNA Delivery. Advanced Materials. 2019

DOI:10.1002/adma.201903637

https://onlinelibrary.wiley.com/doi/10.1002/adma. 201903637

8. AM: Emerging self-luminous technology

for flexible displays Flexible displays combine ultra-thin and lightweight properties, excellent mechanical flexibility, low power consumption, and widely adjustable saturation emission characteristics, opening up opportunities for optoelectronics new possibilities. The demand for flexible displays continues to grow, not only due to their successful commercialization, but more importantly, their endless possibilities for wearable integrated systems. So far, self-luminous technologies for displays, flexible active matrix organic light-emitting diodes (flex-AMOLED), flexible quantum dot light-emitting diodes (flex-QLED) and flexible perovskite light-emitting diodes (flex-PeLEDs) have been widely reported , despite significant progress in these technologies, there are still significant obstacles and challenges to the vision of truly wearable applications, especially for flex-QLED and flex-PeLED.

Here, the research team of Lian Duan of Tsinghua University reviews the latest progress of all three self-luminous technologies for flexible displays, including luminescent active materials, device structures and manufacturing methods, flexible substrates and conductive electrodes, and packaging technologies. Rapid improvements in the efficiency of flexible devices in recent years are also summarized. The review summarizes future developments in this field and is expected to help researchers gain a comprehensive understanding of emerging technologies for flexible displays.

Zhang,D. Duan, L. et al. Emerging Self-Emissive Technologies for Flexible Displays.AM 2019.

DOI:10.1002/adma.201902391

https://onlinelibrary.wiley.com/doi/pdf/10.1002/adma. 201902391

9. AM: 2D perovskites with super excitonic optical nonlinearity for high-performance sub-bandgap photodetection

Two-dimensional (2D) perovskites proven to be promising candidates for photovoltaics, photonics and optoelectronics of promising semiconductors. The team of Kian Ping Loh and Wei Ji proposed a strategy to use the exciton effect in two-dimensional RP-type halide perovskites to achieve efficient, sub-bandgap photodetection. Under the near resonance of two-dimensional excitons, the degenerate two-photon absorption (D-2PA) coefficient of layered RPP is as high as 0.2-0.64 cm MW-1.

Two-dimensional RPP-based sub-bandgap photodetectors show excellent detection performance in the near-infrared (NIR): the two-photon generated current response is as high as 1.2×104 cm2 W-2 s-1. The layered RPP detector is very sensitive to the optical polarization of incident photons, showing considerable anisotropy in its D-2PA coefficients. By controlling the thickness of the inorganic quantum well, it was found that layered RPP of (C4H9NH3)2(CH3NH3)Pb2I7 can be used for three-photon light detection in the NIR region.

2DPerovskites with Giant Excitonic Optical Nonlinearities for High-Performance Sub-Bandgap Photodetection, Advanced Materials, 2019

https://onlinelibrary.wiley.com/doi/pdf/10.1002/adma.201904155

10. AM: 15%! High-efficiency single junction Heterojunction Organic Solar Cells

Highly efficient monojunction heterojunction (BHJ) PM6:Y6 systems can achieve high open circuit voltage (VOC) while maintaining excellent fill factor (FF) and short circuit current (JSC) values. The research team of G. N. Manjunatha Reddy and Thuc-Quyen Nguyen at the University of California, Santa Barbara found that blend systems with low energy shifts exhibit radiative and non-radiative recombination losses, which are lower values ​​reported in the literature.

recombination and extraction kinetic studies show that the device exhibits moderate non-double-stranded recombination and excellent extraction performance across the entire range of relevant operating conditions.Surface and bulk characterization techniques can be used to understand phase separation, long-range ordering, and donor:acceptor (D:A) intermolecular and intramolecular interactions at atomic-scale resolution. This was accomplished using photoconductive atomic force microscopy, grazing-incidence wide-angle X-ray scattering, and a solid-state 19F magic angle rotation NMR spectrometer. The synergy of multifaceted characterization and device physics revealed for the first time key insights into the structure-property relationships of this high-performance BHJ blend. Detailed information on atomically resolved D:A interactions and packing suggests that over 15% of the high efficiency in this mixture can be attributed to a beneficial morphology that retains high JSC and FF despite low energy shifts.

Karki, A. Manjunatha Reddy, G.N. Nguyen, T.-Q. et al. Understanding the High Performance of over 15% Efficiency in Single-Junction Bulk Heterojunction Organic Solar Cells. AM 2019.

DOI: 10.1002/adma.201903868

https: //onlinelibrary.wiley.com/doi/10.1002/adma.201903868

11. JACS: Revealing the intrinsic mechanism of 5-AVAI stabilizing α-FAPbI3

Chemical doping of inorganic-organic hybrid perovskites is an important way to improve perovskite solar cells (PSC) performance and operational stability. The team of Michael Grätzel, Lyndon Emsley and Dominik J. Kubick at Ecole Polytechnique de Lausanne in Switzerland used 5-ammonium valeric acid (AVAI) to chemically stabilize the structure of α-FAPbI3. The atomic-level interaction between the molecular modulator and the perovskite lattice was demonstrated using solid-state NMR, and a structural model of the stable three-dimensional structure was further proposed through DFT calculations.

Research has found that one-step deposition of perovskites in the presence of AVAI produces highly crystalline films with micron-sized grains and enhanced carrier lifetime. Therefore, the efficiency (PCE) of the 5-AVA based solar cell is 18.94%. Under continuous operating conditions, the device maintains 90% of its initial efficiency after 300 hours.

Atomic-LevelMicrostructure of Efficient Formamidinium-Based Perovskite Solar CellsStabilized by 5-Ammonium Valeric Acid Iodide Revealed by Multi-Nuclear andTwo-Dimensional Solid-State NMR, J. Am. Chem. Soc. 2019

https://pubs.acs.org /doi/10.1021/jacs.9b07381

12. JACS: Effect of non-solvent on nanoparticles ligand shell and its crystallization

Generally speaking, solution destabilization is often used when people need to separate nanoparticles from the solvent. method or solvent evaporation method. Destabilization of nanoparticle solutions in solvents often results in the formation of supercrystals with facet orientations, while solution evaporation results in the formation of periodic film-like assemblies. In this article, Byeongdu Lee and Elena V. Shevchenko from Argonne National Laboratory in the United States studied the important role of non-solvents in the washing, dispersion and crystallization of nanoparticles. They introduced a variety of non-solvents into the solution and used small-angle neutron scattering to study the structure of the ligand shell formed on the surface of the nanoparticles. They then used small-angle X-ray scattering to track and detect the formation of crystal facets. Their study shows that the relative miscibility of the nonsolvent with the solvent and ligand determines the degree of solvation and thickness of the ligand shell, and thus the structure of the supercrystal.

In the early stage of crystallization, truncated octahedral PbS nanoparticles form a supercrystal with face-centered cubic symmetry. In the later stage, the supercrystal formed by large (5.60nm) nanoparticles maintained face-centered cubic symmetry, while the supercrystal assembled by small (4.14nm) nanoparticles experienced body-centered cubic (bcc) symmetry after Bayesian transformation. The lattice undergoes a phase transition into a polycrystalline supercrystal containing three structurally relevant bcc domains and one untransformed fcc domain. This research work provides a detailed understanding of the non-solvent effect that affects the formation of supercrystals, which can help people choose appropriate reagents and ratios when purifying solvent/non-solvent mixtures.

ByeongduLee, Elena V. Shevchenko et al, Revealing the Effects of the Non-solvent on the Ligand Shell of Nanoparticles and Their Crystallization, JACS, 2019

DOI:10.1021/jacs.9b06010

https://pubs.acs.org/doi/10.1021 /jacs.9b06010

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