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Figure 1. The super lens design driven by the advanced manufacturing technology of the beetle image under the green LED illumination by MCHL promotes the emergence of ultra-thin, lightweight, flat and other unprecedented functional lenses. Due to the simple manufacturing, single-step lithography is generally required, so it is possible to integrate vertically. These flat lenses can be replaced or complemented by conventional refractive and diffractive lenses, further miniaturizing high performance optical devices and systems. Harvard University's Federico Capasso (corresponding author) reviewed the development of super lenses. The author first gave a brief overview of the super lens, summarizing its important characteristics: diffraction limit focusing, high quality imaging and versatility. Afterwards, the current problems and solutions were discussed, and the future development of the industry was prospected. 2. Advanced Materials Review: Nanomaterials Rebuild on Demand: When Electrons Encounter Ions 
Figure 2 Reconstruction of nanomaterials Due to the rapid development of the industry, which is approaching the basic physical limits and facing severe performance and cost constraints, multifunctional materials and devices are transforming into new intelligent and efficient computing systems. By controlling the internal ion distribution of the solid film, after applying an applied electric field to it at room temperature, the chemical composition and physical properties of the material will be reversibly reconfigured after device fabrication. Remodelability can be observed in many materials, including commonly used dielectric films, which can be used to develop new devices such as variable resistance memories. Physical reconfigurability further combines memory and logic operations in the same device for efficient in-memory calculations and neuromorphic calculations. Electrical, optical, and magnetic effects can also be coupled by directly changing the chemical composition of the material. Professor Lu Wei of the University of Michigan (corresponding author) reviewed the latest developments in the field of nanomaterial remodeling, introduced basic materials and equipment research, revealed dynamic ion processes, and discussed system modeling, device and material challenges, and Future research directions. 3.Nature Reviews Materials Review: Breaking Shockley–Queisser Limits with Singlet Excitonic Fission 
Figure 3. Basic concept of singlet exciton fission Singlet exciton fission is a process of carrier multiplication in organic semiconductors. Two electron-hole pairs can be generated for each photon absorption. Singlet fission occurs in 100 fs with a yield of up to 200%, and photovoltaic devices based on singlet fission can achieve an apparent quantum efficiency of more than 100%. The main challenge in this area is to use single-line fission to increase the efficiency of traditional inorganic solar cells, breaking the Shockley-Queisser limit for single-junction photovoltaic efficiency. Cambridge University Akshay Rao (corresponding author) evaluated the current status of singlet exciton fission, focusing on the basis of singlet exciton fission, quantitative detection, mechanism and application of singlet exciton fission materials in photovoltaic devices. Finally, the future development of singlet exciton fission is expected. 4. Progress in Polymer Science: Free Radical Polymerization in Eutectic Solvents: Green Synthesis of Functional Materials 
Figure 4. Application of eutectic solvents (DESs) in free radical polymerization. 5. Progress in Polymer Science: Preparation of polycondensates by enzymatic polymerization: Taking aliphatic polyesters, polyamides and polyesteramides as examples with human environmental awareness The increasing use of reducing or avoiding the use of conventional organic solvents in polymer science is imperative, so the search for alternative reaction media is imminent. Low eutectic solvents (DESs), a type of ionic liquid, have become a solvent for sustainable use in a wide range of chemical reactions. Josué D. Mota Morales (corresponding author) of the National Autonomous University of Mexico, etc., reviewed DES for free radical polymerization. The article first introduces DES monomers that can act as hydrogen bond donors or ammonium salts of DES and can undergo free radical polymerization. Subsequently, DES was introduced as a solvent for homogeneous or emulsion polymerization. Finally, the properties of polymers using specific chemical synthesis methods are discussed. 5. Progress in Polymer Science: Enzymatic Polymerization to Prepare Polycondensates: Examples of Aliphatic Polyesters, Polyamides, and Polyester Esters 
Figure 5 Synthesis of Aliphatic Polyesters, Polyamides and Polyester Esters and Substrates As an efficient and feasible means of polymerization, enzymatic polymerization is expected to replace traditional chemically catalyzed polymerization processes. Compared with traditional chemical catalytic polymerization, enzyme polymerization has significant advantages, such as mild reaction conditions, low toxicity and high selectivity of catalyst (enzyme), eliminating the protection-deprotection step and improving the quality/performance of the final product. In the past three decades, the biocatalytic synthesis route of polycondensation polymers containing a large amount of monomer homopolymerization and copolymerization has been in the research stage. The enzyme polymerization system of aliphatic polyesters, polyamides and polyesteramides was reviewed by Stamatina Vouyiouka (corresponding author), National Technical University of Athens, Greece. The author first introduced the principle of polycondensation reaction, the chemical catalytic polymerization of aliphatic polyesters and polyamides, and the history of enzyme catalysis. Then, in the enzymatic polymerization principle of aliphatic polyester and polyamide, the mechanism and mechanism of enzymatic polymerization, the mechanism of enzymatic polycondensation and ring-opening polymerization were proposed, and the enzymatic polymerization process of aliphatic polyester and polyamide was introduced. Related parameters, such as the type and concentration of the enzyme, the length and type of the monomer chain, the reaction temperature and time, and the type of solvent, by-product removal methods, and the like. 6.Chemical Society Reviews: Fluorescent Chemical Sensors: Yesterday, Today and Tomorrow 
Figure 6. Hela cells under fluorescent microscopy Fluorescent chemical sensors for ionic and neutral analytes have been used in a wide range of applications such as biology, physiology, pharmacology, and environmental science. Fluorescent chemical sensors have been around for about 150 years and a large number of fluorescent chemical sensors are available for the detection of biologically and/or environmentally important substances. Despite the significant progress in this area, there are still some problems and challenges. Tony D. James of the University of Bath, Juyoung Yoon of the Ewha Women's University of Korea, Engin U. Akkaya of the University of Birken, Turkey, and Thorfinnur Gunnlaugsson of the University of Dublin, Ireland (co-communication author) introduced the history of fluorescent sensors, commonly known as chemical sensors. And a general overview of its research and development. The basic principles of chemical sensor design for specific analytes, problems and challenges in the field, and possible future research directions are described. 7.Chemical Society Reviews: From supramolecular polymers to multi-component biomaterials 
Figure 7 Schematic diagram of extracellular matrix (ECM) Â Â Â Â The most striking and general property of extracellular matrix (ECM) biofibrous structures is the strong and directional interaction between bioactive protein subunits. These fibers have a rich dynamic behavior without losing the integrity of their architecture. The complexity of ECM has inspired synthetic chemists to imitate these properties in artificial one-dimensional fiber structures with the goal of obtaining multi-component biomaterials. Supramolecular biomaterials are a powerful alternative to regenerative medicine due to the dynamic characteristics required to interact with natural tissues. Depending on the field of application, the above-mentioned multi-component fiber biomaterials have different design criteria as elastomeric or gel systems. Elastomeric materials are used to carry the properties while hydrogels are used to support in vitro cell culture. EW Meijer and Patricia YW Dankers of Eindhoven University of Technology (co-author) showcased the conversion of one-dimensional supramolecular polymers into multi-component functional biomaterials for regenerative medicine. The article first introduces the historical development of supramolecular polymers, followed by the description of supramolecular polymers that can be used as elastomeric materials or gelling factors. 8.Accounts of Chemical Research: Conversion of MOFs/CPs to Functional Nanomaterials: Experimental Process Based on Mechanical Perspective 
Figure 8 Conversion of MOFs/CPs to functional nanomaterials Nanomaterials (such as porous metal oxides, metal nanoparticles, porous carbon and their composites) have been widely used due to their wide range of applications in energy conversion and storage devices, catalysis, and gas storage. Research. Metal organic frameworks (MOFs) and coordination polymers (CPs) have become novel precursors for these nanomaterials because they contain both organic and inorganic species as templates and precursors under given conditions. The thermal conversion of MOFs provides a viable route for the preparation of functional nanomaterials that are difficult to obtain using conventional methods. Hoi Ri Moon (communication author) of Ulsan University of Science and Technology in Korea reviewed the preparation of functional nanomaterials using MOFs/CPs as precursors, and discussed various experimental methods based on mechanical perspective. 9.Accounts of Chemical Research: Multi-luminescence Center Chemical Sensing of Lanthanide Functionalized MOF Composites 
Fig. 9 Construction and application of lanthanide functionalized MOF composites Due to the special structural adjustability and performance of metal organic frameworks (MOFs), they have certain advantages over other chemically induced materials. MOFs contain versatile modules (linkers or ligands) with special chemical reactions, so post-synthesis modification (PSM) offers the possibility to develop and expand its properties. The introduction of photoactive lanthanide ions (Ln3+) into the bulk of the MOF produces new luminescent signals at different locations in the MOF linker. The nature of the unique luminescent center may cause changes in the response to sensitive species (such as ratio sensing), which provides new opportunities for luminescence research and chemical sensing applications. Professor Yan Bing (corresponding author) of Tongji University reviewed the latest research progress of lanthanide functionalized MOF composites for chemical sensing in multiple luminescent centers. The authors first proposed a general strategy for functionalizing MOF hosts of lanthanide ions, compounds or other luminescent species (organic dyes or carbon dots) and based on functionalized MOF photofunctional composite systems. Five methods were used: in situ composite, Ion doping, ion exchange, post-covalent post-synthesis modification, and post-synthesis post-modification. Then the application of the functionalized MOF composites in temperature sensing, pH sensing, food quality and air pollutant detection was introduced.
The latest review of the material frontier
1.Science Review: Super Lens: Multi-Purpose Multi-Function Optical Components