Nanjing University Professor Chen Su Task Force research highlights
TF innovative applications mainly carried out basic research, research comprising: , the photonic crystal material, the inorganic nano micro-macro – molecular assembly functional organic polymer material, the front end of the polymerization reaction engineering, microfluidic control technology, the hydrogel material. Meanwhile, for application in engineering technology research fields of functional polymer material, a semiconductor material, a fluorescent material, LED light-emitting device, an aqueous resin. Professor Chen Su number of technology industry has achieved, his team developed microfluidic spinning technique (including microfluidic spinning, electrospinning microfluidics, microfluidics gas jet spinning, etc.), once launch would be a high degree of attention and recognition of the industry, the technology has been used in many key areas (including spinning chemical, functional medicine, wear flexible, intelligent optical, etc.). Here Professor Chen Su Task Force findings recently in the photonic crystal fiber storage, quantum dots and hydrogels, etc.
1. crystals and a highly hydrophobic microfluidic assembly
ishaving a periodic dielectric structure and artificially designed and manufactured crystalline photonic bandgap. However, the presence of a single species of synthetic photonic crystal material and production method, the conventional photonic crystal film mainly polystyrene (PS), polymethyl methacrylate (PMMA) and silica (SiO2) is assembled, since they It has a high deposition temperature and to build a weak force acting between the assembly units, so that the photonic crystal film susceptible to cracking, color saturation difference , causing it to increase in fluorescence inefficient . Therefore, how to develop high-quality photonic crystal materials become one of the challenging issues in this area. Professor Chen Su developed a research group P (t-BA) A new method a highly hydrophobic photonic crystal , prepared using polymeric microspheres hydrophobic monomer, its inherent hydrophobic high driving force can be assembled photonic crystal material, the photonic crystal film is difficult to solve the large-area construction, and easy to enhance the efficiency of low fluorescence cracking problems. Found a low glass transition temperature of the soft monomers: t-butyl acrylate monomer (t-BA, Tg = 43 ℃), P (t-BA) was prepared by the emulsion polymerization method is not an emulsion. Since P (t-BA) moleculeHydrophobic chain having a t-butyl group, a hydrophobic group in the P (t-BA) latex can be provided during the assembly of the driving force of one hydrophobic self-assembly, thereby inducing P (t-BA) having a photonic crystal film does not crack large, bright structural color having excellent hydrophobicity and . Meanwhile, the photonic crystal film with a high efficiency of fluorescence enhancement (up to 10-fold increase in fluorescence efficiency) . Furthermore, clever use of microfluidic technology microspheres and photonic crystals Janus microspheres in the magnetic field induced microfluidic assembly and constructed and applied magnetic display device. Reference: Hydrophobic Poly (tert-butyl acrylate) Photonic Crystals towards Robust Energy-Saving Performance Angewandte Chemie International Edition , 2019, 58, 13556-13564
. 2. a new method of forming colloidal photonic crystals
easy to produce colloidal photonic crystals coffee rings and cracking during assembly into an ordered microstructure of material, seriously hampered to build a large area colloidal photonic crystal film. Based on this, Professor Chen Su Task Force developed A new method for the deposition of colloidal photonic crystals , solved the colloid latex film formation difficult, issue can not be a large area of construction. Milk is easy to produce by the heated surface inspired \”milk skin effect\”, by precise control of the and the liquid droplets forming conditions , and skillfully introduced into a layer of colloidal particles during assembly \”hydrocolloid skin\” , a good solution due to non-uniform heterogeneous systems coffee ring effect due to volatilization. Based on this theory, the researchers also realized Full color printing spectrum structure , patterned functional materials, preparation of high performance devices and 3D printing, ink create colorful photonic crystal has important significance. At the same time, by means of this method and a roll coating may be, A large area of large area coating assembly means respectively may be implemented with a structural color coating colloidal particles prepared successfully colloidal photonic crystal film 90 × 70 cm of the , and LED backlight for display by bright. References: Large-scale colloidal films with robust structural colors Materials Horizons , 2019, 6 (1):.. 90-96
3 photonic crystal film metal organic frameworks [ 123] metal-organic frameworks (of MOFs) guide photonic structural material attracted wide attention. However, in order to MOF particles as units built directly into the photonic crystal is still a challenge.
Professor Chen Su Synthesis of monodisperse TF polyamidoamine dendrimer (of PAMAM) imidazole ester modified zeolite skeleton (ZIF-8) particles (PAMAM @ ZIF-8), making ZIF-8 has hydrophilicity. PAMAM @ ZIF-8 can be directly assembled into uniform particles of the photonic structure, and the coffee ring effect can be suppressed, a homogeneous structure of the photonic crystal films having different colors. Using a membrane separating an auxiliary assembly process, the reduced graphene oxide (RGO) surface obtained PAMAM @ ZIF-8 photonic crystal film (PAMAM @ ZIF-8 / rGO), and showing is excellent in separation ability of the organic dye solution , thus enriching the function of the photonic crystal material, provides a new strategy for the manufacture of a functional MOFs photonic crystal material. Reference: MOF-Based Photonic Crystal Film toward Separation of Organic Dyes ACS Applied Materials & Interfaces , 2020,12 (2):.. 2816-2825
4 colloidal amorphous photonic crystal for the conventional method of a photonic crystal (e.g.Vertical deposition, dip, spin coating method, etc.) and build process cumbersome, time-consuming and difficult issues key construction of a large area,
Professor Chen Su subjects developed A a new method for preparing amorphous colloidal photonic crystals, photonic crystals to solve the low deposition efficiency and industrial production problems can not be . using hydrophilically modified graphene / polymer separation membrane colloidal emulsion of water and the colloidal particles, while the assembled structure of graphene color film surface, rapid and efficient method which can be prepared in the 2 minutes photonic crystal film. The present study explored the mechanism of formation of the structural color, found black key graphene substrate is formed of a structural color, and the graphene substrate surface facilitates the formation of wrinkles amorphous photonic crystal structure, such that the amorphous structure photonic crystal color does not depend on the viewing angle reasons. The study also explored the use of photonic crystals in passive cooling is found in a sunlight too, as compared to ordinary polystyrene film, a structural color film of the surface temperature may be reduced 6.8 ℃. The research study for photonic crystal insulating material provides idea. Reference: Reduced Graphene Oxide Membrane Induced Robust Structural Colors toward Personal Thermal Management ACS Photonics , 2018, DOI:. 10.1021 / acsphotonics.8b00952
1. the microfluidic spinning heterostructure constructed micrometer fiber nonwoven fabric currently, new energy storage technology in the field of scientific research has become, industrial production, etc. research focus, especially in the high-end smart wearable device industry (annual production value of 28 billion US dollars). Wherein, the development of lightweight, flexible and energy storage material having a high energy density is powered wearable electronic device is a major challenge of the subject field. Based on this,
Professor TF by spinning the microfluidic technology Chen SuPreparation technique black phosphorus-based fibers and high flexibility nonwoven fabric highly conductive electrode, and its flexibility to build a supercapacitor with high energy density. by a two-dimensional black phosphorus (BP) a bridging dimensional carbon nanotube sheet (of CNTs), increasing the electron conductivity between the black phosphorus sheet, mechanical stability, and a redox ion diffusion channel thereby promoting ion electrode – an electrolyte layer faster transfer at the interface and accumulated more. Thanks to this spinning heterostructure and microfluidic design, performance is obtained with super capacitor electrodes of the nonwoven fabric of high energy density (96.5 mWh cm -3 ) [123 ] application stability and deformation energy supply capacity, and the successful implementation of energy supply for LEDs, smart watch, color displays and other electronic devices. Reference: Microfluidic-spinning construction of black-phosphorus-hybrid microfibres fornon-woven fabrics toward a high energy density flexible supercapacitor Nature Communications, 2018, 9:.. 4573. 2 gas ejection microfluidic spinning the nanofiber nonwoven fabric constructed hierarchy
for the fibrous material microstructure of uncontrollable size and large-scale preparation and the like difficult, resulting in slow ion transport device, less charge storage density and low energy disadvantage, Professor Chen Su
TF first microfluidic droplet method, rapid response by the composition within the droplet primitives confinement space, thereby continuously producing a uniform and orderly microstructure – mesoporous carbon backbone nanohybrids electrode material. so quickly pass in droplet mass and heat transfer in the reactor, to achieve MOFs (ZIF-8), quick and efficient assembly of graphene and carbon nanotubes reaction, the annealed carbon skeleton prepared nano hybrid material having good pore structure (pore narrow 0.86nm), large specific surface area (1206 m 2 g -1 ) and rich in nitrogen content (10.63%). Furthermore,Mechanical problems for poor performance fiber electrodes and the like is difficult to scale preparation, to develop microfluidic gas jet spinning process, large-scale preparation having high conductivity (236 S m -1 ) and high mechanical properties (Young\’s modulus of 235.2 Mpa, elongation at break 43.1%) of nanofiber based electrode materials for supercapacitor. In this fiber constructed supercapacitors exhibit excellent electrochemical properties, such as high energy density (147.5 mWh cm -3 ), a large specific capacitance (472 F cm -3 [ 123]) and new ways of self-powered stable characteristics can provide a flexible wearable for the development of the industry. Reference:.. HierarchicalMicro-Mesoporous Carbon-Framework-Based Hybrid Nanofibres for High-DensityCapacitive Energy Storage Angewandte Chemie International Edition, 2019, 58,17465-17473 3 microfluidic control apparatus nitrogen porous structure doping the graphene fiber electrode
for an electrode component fibers uneven, disordered pore structure distribution problems in areas such as, Prof. Chen Su
TF using the microfluidic control method for the preparation of [123 ] graphene nitrogen-doped uniformly porous fibrous material . using graphene oxide (GO) and urea uniformly assembly reaction, programmed pyrolysis in the microchannel, tiered regulatory doped with nitrogen and controlled pore structure. The preparation method can not only mass production of fibers, which also gives high flexibility and may be braided resistance. Through regulation of the experiment, the total amount to achieve the graphene fibers doped with nitrogen atoms at 1.71% to 7.4% of the control, to obtain the pyridine nitrogen doping amount was 2.44%, more fibers exhibit a uniform pore structure (average pore size 3.2 nm), large specific surface area (388.6 m 2 g -1 ), high onElectrically (30,785 S m -1 ) and Tensile Strength (286 MPa). Fibrous constructed exhibits a large specific capacitance capacitor (1132 mF cm -2 ) and High energy density (95.7 μWh cm -2 ). Based on the above excellent electrical, mechanical, electrochemical properties, fibrous audiovisual capacitor successfully applied power electronics. Reference:.. High-Performance Wearable Micro-Supercapacitors Based on Microfluidic-Directed Nitrogen-DopedGraphene Fiber Electrodes Advanced Functional Materials, 2017,27 (36), 1702493 4 construct microfluidic point / electrode structure of the fiber sheet the key issue for low electrode surface area fibers and mechanical strength,
Prof. Chen Su TF
in the nano-carbon-doped quantum dot material as a means of self-assembled inner and confinement hetero microchannels, carbon build quantum dots have high mechanical strength and a high energy density / fiber graphene supercapacitor. confinement within the microfluidic channel, hydrophilic carbon nano quantum dots, and the graphene through hydrogen bonding and dehydration – self-condensation form the assembled bridge connected \”Dot-Sheet\” structure, so that the mechanical strength of the fiber electrodes and electrochemical properties were 3-fold increased . Reference:. Enriched Carbon Dots / Graphene Microfibers towards High-Performance Micro-Supercapacitors Journalof Materials Chemistry A, 2018, 6, 14112-14119 amountPoint dots
1. Preparation of fluorescent magnetic mass Calorimetry carbon quantum dots
As a carbon material, carbon quantum dot its excellent optical and physico-chemical performance attracted researchers\’ attention. Carbon quantum dots non-toxic, inexpensive, widely available raw materials, etc., have important applications in biology, energy, displays, and other fields. However, the quantum dots carbon single species and production method, the solvent method the reaction rate conventional heat, microwave synthesis slow, low conversion rate, the carbon can not achieve quantum dots
Large Scale Preparation . Therefore, how to develop new technology to achieve low-cost rapid preparation of large-scale carbon quantum dots become one of the challenging issues in this area. Chen Su Prof. TF
magnetic innovative use of the thermal reactor, fast pyrolysis citrates and urea, in three minutes step rapid carbon fluorescent quantum dots prepared. By optimizing the reaction conditions, can be obtained up to 80g of carbon powder quantum dots within one hour (yield is higher than traditional methods nearly 160 times) . Compared with ordinary reactor, high-energy magnetic thermal reactor, the temperature rise fast and the temperature stability, heat evenly throughout the reaction from the reaction transition contact non-contact type reaction, safe and efficient. This method not only provides a new way to synthesize carbon quantum dot material, but also greatly promote the industrial development of carbon quantum dots. Reference: Rapid and Large-Scale Production of Multi-Fluorescence Dots via Carbon Magnetic Hyperthermia Method Angewandte Chemie International Edition, 2020, DOI:.. 10.1002 / anie.201914331 2 construct electrostatic microfluidics high water perovskite polymeric fiber membrane using the external field build micro-nano fibers has been one of the hot research abroad. Especially in the one-dimensional micro-nano fiber electrospinning, represented by its easy to get fiber, small fiber diameter and other outstanding features attracted widespread attention in the last two decades. However, the electrospinning process is a physical process, it isChemical changes occur is difficult.
Professor Chen Su The microfluidic research group developed electrostatic spinning machine used to construct full-inorganic perovskite halide nanocrystals (PNCs) doped polymer material.
innovative new concept chemical fiber spinning (Fiber-spinningchemistry, FSC), i.e. in situ generation PNCs achieved in the fiber micro-nano fibers confined space. In one aspect, the method solves the problem of poor water stability PNCs; on the other hand, proposed a new method of FSC synthesizing new PNCs ; the same time, this method is environment-friendly, greatly reduces volatile organic compound (VOCs) emissions, the PNC prepared water resistance greatly improved after 90 days storage in the air, PNCs / polymer fiber membrane is kept constant in photoluminescence (PL), and held in the 120 hours of water immersion 82% PL . Reference:.. Fiber-Spinning-Chemistry Method toward In Situ Generation of Highly Stable Halide Perovskite Nanocrystals Advanced Science, 2019, 6, 1901694. 3 point carbon / polymer composite is applied to the fingerprint extraction and recognition for the current application of quantum dots carbon limitation problem,
Prof. Chen Su TF
the point of carbon / polymer composite material as a non- matrices of the ink pattern, can be realized a latent fingerprint extraction and identification . Compared with the traditional method of extracting a fingerprint, which can be not only safe effective non-toxic fingerprints on the surface of a variety of materials, the material surface can be avoided interference color fingerprinting. Based Point Carbon / polymer composites in principle fingerprint extraction and recognition of, the composite material can be applied to gravure and letterpress printing industry, offers a new approach to fingerprint recognition and extraction of green printing industry. Reference: Recognition of Latent Fingerprints andInk-Free Printing Derived fromInterfacial Segregation of Carbon Dots ACS Applied Materials & Interfaces, 2018, DOI:.. 10.1021 / acsami.8b13545 Hydrogels
1 micromolar fluidics design self-healing driving force of the macroscopic self-assembly
at present, the study focused on the self-assembly of molecular-level assembly, self-assembly macro rarely reported, in particular, the nature of artificial self-assembled and self-assembly efficiency low, has become a bottleneck hindering their development, how to improve the efficiency of self-assembly is one of today\’s international challenging task.
Professor Chen Su TF to microfluidic technology as a means
The original design and development of a method of assembling a self-healing macroscopic driving force . clever use of Self-healing Hydrogel microspheres as an assembly unit, to achieve the supramolecular hydrogel beads within the microfluidic channel continuous confinement of directed assembly , by designing different types of channels, such as a single-channel, Y-channel, parallel channels, channel stereo triangle, can achieve a particular morphology controlled assembly of assembly. And based on the inherent hydrogen bonding between the supramolecular assembly force cell, can be done in minutes assembly , from a structural unit assembled into micron macro-material, increasing the efficiency of assembly, prepared the hydrogel material has good biocompatibility, is a good human tissue material. In addition, researchers also use this method to achieve a self-assembled fluorescent beads, and preparing an LED for its success. The research is multi-dimensional materials design and rapid build new functional materials provides a new method. Reference: Versatile Hydrogel Ensembles with Macroscopic Multi-Dimensions.Advanced Materials, 2018, 30, 1803475 2. The microfluidic gel spinning situ synthesis of self-healing and self-assembled to build a fiber fabric How to transform a simple manner by a one-dimensional (1D) into a fibrous material multi-dimensional ordered structure material has important significance of research and application.
Professor Chen Su TF-based microfluidic gel spun fibers situ synthesis of self-healing, and self-healing using the cooperation between the fibrils force
fiber achieved 1D the multi-dimensional woven fabric. The microfluidic spinning technique because it is simple, efficient and flexible controllable and environmentally friendly process for the continuous chemical fibers and gel structure of the microreactor provides a powerful platform. Force based on the main object, by the inherent force between the supramolecular fibrils, to achieve a simple multi-dimensional fabric quickly build up, the fabric has good flexibility, tensile properties and high mechanical properties. In addition, researchers gel fibers combined with the conductive nano material, successful self-healing composite wire and ultracapacitor prepared using this method. The findings of the multi-dimensional fibrous materials of construction and design provides a rapid build new idea. Reference: Microfluidic-Directed Hydrogel Fabrics Based on Interfibrillar Self-Healing Effects Chemistry of Materials, 2018, DOI:. 10.1021 / acs.chemmater.8b03579 Professor Chen TF Su page: https: //www.x-mol .com / groups / su_chen Professor Chen Su Introduction Chen Su , Ph.D., professor, doctoral tutor, vice president of Chemical Engineering, Nanjing University, Jiangsu Province, high-function fine molecular materials High-Tech Research laboratory Director. 2002–2004 were conducted respectively and post-doctoral research fellow in the Department of Polymer Science, Department of Chemistry, University of Massachusetts and the University of Southern Mississippi. After returning mainly in the innovative application of basic research, research comprising: a quantum dot, the photonic crystal material, the inorganic nano micro-macro – assembling organic moleculesFunctional polymer materials, distal polymerization reaction engineering, microfluidics, hydrogel material. Meanwhile, for application in engineering technology research fields of functional polymer material, a semiconductor material, a fluorescent material, LED light-emitting device, an aqueous resin. It has hosted the National Natural Science Foundation of China and the surface of the item 6, six people national \”Eleventh Five-Year\” Technology Support Program sub-project, \”863\” key project sub-topics, sub-topics key national research and development program, in Jiangsu Province \” peak \”high-level personnel project, Jiangsu Province university science major basic research projects, Jiangsu Science and Technology support Program (industrial) projects, doctoral Program of higher Research Fund, American Celanese Corporation international cooperation, Ministry of personnel and projects focused on returning from overseas funds and other projects. To the first or corresponding contacts in Nat. Commun., J. Am. Chem. Soc., Angew. Chem. Int.Ed., Adv. Mater., Published by SCI more than 200 papers in the journal Macromolecules and other internationally renowned , related achievements are American Science News, widely reported in Nature-NPG AsiaMaterials, MRS Bulletin, Chemical & Engineering News, Chemistry Views and other academic media. Journal ofNanomaterials magazine as Guest Editor, The Scientific World Journal magazine editorial, J. Am. Chem. Soc., Chem. Mater., And Macromolecules journals and a dozen well-known reviewers and the British Royal Society of Chemistry invited reviewers. National Ministry of Education Natural Science Award 1, China Petroleum and Chemical Industry Association Technology Invention 1, Jiangsu Province Science and Technology Progress Award 2, the International Nanotechnology and nanotechnology achievements contest won silver Award 1. Jiangsu province \”Blue Project\” academic leaders, China Instrument Society materials, synthetic resins, director of engineering and technology research center in Jiangsu Province Technical Committee. team photo