Abstract:By using three configurations of cationic surfactants〔cetyltrimethylammonium bromide(CTAB), Dimethylene-1,2-bis(N-dodecyl-N,N-dimethylammonium bromide)(Gemini 12-2-12) and decamethonium bromide(Bola)〕modified Fe3O4 nanoparticles to produce Fe3O4@CTAB, Fe3O4@Gemini and Fe3O4@Bola (all three are collectively called Fe3O4@surfactants). Respectively, which were used for the treatment of As(Ⅴ) and As(Ⅲ) in water. The morphology was characterized by XRD, TEM, FTIR and magnetic measurement system(VSM), while the adsorption kinetics, adsorption isotherm model fitting and adsorption behavior of As(Ⅴ) and As(Ⅲ) were studied, and the adsorption-desorption regeneration cycle performance and structural stability of Fe3O4@surfactants were investigated. The results showed that the adsorption effect of Fe3O4@surfactants on As(Ⅴ) was higher than that of As(Ⅲ), the adsorption was consistent with the quasi-secondary kinetic model and the Langmuir adsorption isotherm model, and the adsorption capacity of Fe3O4 nanoparticles modified by Gemini 12-2-12 surfactant was the largest. The adsorption driving force of this adsorption process mainly comes from the arrangement behavior of cationic surfactant molecules at the solid-liquid interface, the electrostatic interaction between the surfactant head group and the anion, and the coordination between the tail chain and As(Ⅴ) and As(Ⅲ). The cycle experiment was conducted with As(Ⅴ), which has a high removal efficiency. After five adsorption-desorption cycles, the adsorption rate of As(Ⅴ) by Fe3O4@surfactants was still maintained at about 85%, and the recovery of nanoparticles were all above 90%.

Abstract:Liquid cooling technology is an efficient solution to the cooling problem of data centers. In particular, immersion liquid cooling is most ideal and environmentally friendly among the three methods of liquid cooling. The development status of immersion coolant is reviewed, which is the key role of immersion liquid cooling technology, including the technical indicators of ideal immersion coolant, and classification, physical and chemical properties of current immersion coolant. Considering the insulation, heat transfer performance, thermal stability, safety and other factors, it is proposed that perfluoroolefin is an ideal immersion coolant at present. In view of the achievements and existing problems of current research, future research will focus on scientific molecular design of immersion coolants, establishment of efficient and comprehensive screening mechanisms, and development of green synthetic process routes.

Abstract:Hydrogen production by electrolysis of water is a hot topic in the research of green hydrogen energy, the high overpotential of the oxygen evolution reaction is the main reason for the slow kinetics of electrolysis of water. In order to improve the efficiency of hydrogen production by electrolysis of water, the amorphous transition metal boride Ni-Fe-Co-B was mainly prepared by simple liquid phase synthesis with sodium borohydride and transition metal Ni, Fe and Co salts as raw materials, using it as the oxygen evolution reaction catalyst. The materials were characterized by SEM, TEM, XRD, XPS and Electrochemical characterization. The results show that the amorphous catalytic material Ni-Fe-Co-B has been successfully synthesized, When n(Ni)∶n(Fe)∶n(Co)=1∶1∶1, the overpotential is only 299 mV and the Tafel slope is 101 mV/dec at current density of 20 mA/cm2. Under the constant voltage test of 0.47 V, Ni-Fe-Co-B has excellent stability of more than 12 h.

Abstract:Azobenzene-terminated poly(dimethylaminoethylmethacrylate) (PDMAEMA-AZO) with pH, temperature and light triple-sensitivity was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization of dimethylaminoethylmethacrylate (DMAEMA) at present of azobenzene-containing trithiocarbonate chain transfer agent (CTA-AZO). The structure of the prepared PDMAEMA-AZO polymer was characterized by ultraviolet spectroscopy (UV), Fourier transform infrared spectroscopy (FTIR), hydrogen nuclear magnetic resonance spectroscopy (1HNMR) and gel permeation chromatography (GPC), and the properties of photo, temperature and pH-sensitivity of the polymer were investigated. The results of GPC indicate that the relative molecular weight of the as-synthesized polymers is controllable and the molecular weight distribution (PDI) is below 1.78. The photosensitivity of PDMAEMA-AZO polymer in water, ethanol and chloroform shows that PDMAEMA-AZO polymer can undergo rapid and reversible cis-trans photo-isomerization subjected to UV and visible light alternately, and quickly reach photo stable state. The thermosensitivity of PDMAEMA-AZO shows that the lower critical solution temperature (LCST) of PDMAEMA-AZO is lower than that of PDMAEMA. The LCST of polymer decreases with the increase of its concentration, and the window of the phase transition is narrowed. When the pH exceeds 9.44, the LCST of the PDMAEMA-AZO polymer remains unchanged. When the pH drops from 9.44 to 7.34, the LCST increases, and when the pH is less than 7.34, it is no longer temperature sensitive. The above thermosesitivity results indicate that the polymer was a LCST-type temperature-sensitive polymer under the control of pH. Finally, the LCST of the polymer reversibly increases and decreases subjected to multiple alternating irradiation of UV and visible light, which shows that the PDMAEMA-AZO polymer has light-controlled thermosensitivity.

Abstract:Nano CeO2 colloids was prepared at the room temperature with cerium nitrate as cerium source, ammonia as pH regulator and polyvinyl alcohol as dispersant. The structure and properties of nano CeO2 colloids was characterized by FTIR, DLS, XRD and TEM. The possible formation mechanism and stable existence of nano CeO2 colloids was also be discussed. The results show that nano CeO2 colloids effectively dispersed in polyvinyl alcohol was obtained by mild and simple preparation process. Its crystal form was face centered cubic crystal system, the crystal structure was fluorite-type, the average diameter was about 28.2 nm, the storage time was 12 months. The UV aging resistance and thermal stability of nano CeO2 modified waterborne polyurethane (CWPU) and 2,4-dihydroxybenzophenone (UV-0) modified waterborne polyurethane (DWPU) were compared. The results of UV aging resistance showed that under the same test conditions, the ΔE, the b value and the wear loss compared with DWPU film decreased by 58.2%, 62.5% and 56.3% respectively, and the reduction rates of tensile strength and elongation at break were 47.8% and 43.3% of DWPU film respectively. The thermal stability test results showed that when the weight loss rate of DWPU film was 50%, the decomposition temperature was 310.62 ℃. At this temperature, the weight loss rate of CWPU film was only 12.35%. The temperature corresponding to the maximum thermal decomposition rate of CWPU film was 80 ℃ higher than that of DWPU film.

Abstract:The bio-based amine (DAPVD) was prepared from the amination of the diglycidyl ether (DEPVD), and cured with camphoric acid-based diglycidyl ester (DGECA) to prepare epoxy resin. The chemical structure was confirmed by the FT-IR spectrum, and the resin samples and carbon fiber reinforced polymers (CFRPs) were prepared for tests. The properties of DGECA-DAPVD were characterized by DMA, the tensile test, the stress relaxation test and TGA, and the recycle of carbon fiber was confirmed by the Raman spectra of virgin fiber and recycle fiber. The result indicated that the spior diacetal made the crossed-linked network degradable and tertiary amines-catalyzed transesterification reactions endowed DGECA-DAPVD with repairing and remolding functions. In addition, CFRPs based on DGECA-DAPVD resin can degrade rapidly in 0.1 M H+ acid solution at 50℃/48h and promoted the recycle of carbon fiber, derived from the excellent degradation property of epoxy resins.

Abstract:The intelligent drug delivery system with multi stimulus cooperative response has important research value. In this paper, PNIPAM-co-AA microgels were synthesized using N-isopropylacrylamide (NIPAM) as monomer, acrylic acid (AA) as functional monomer by emulsion polymerization. PNIPAM-co-AA/GO composite system was obtained by ultrasonic blending of PNIPAM-co-AA and GO, which was applied to the study of drug release. The microstructure and properties of microgels and composite system were characterized by FTIR, SEM, DLS and UV-Vis. The results showed that the particle size of PNIPAM-co-AA microgels was about 458.7 nm, the Lower Critical Solution Temperature (LCST) increases to 40 ℃, showing temperature and pH sensitivity. After the introduction of GO into the PNIPAM-co-AA microgel system, the presence of GO transformed the temperature response control of the composite system into Near Infra-Red (NIR) response. The results showed that the composite system is irradiated by NIR light, and can convert NIR light energy into LCST in microgel within 3 min. After multiple cycles, the photothermal conversion performance is stable. The drug release study showed that under the conditions of NIR and pH 7.4, the cumulative release rate of 5-Fluorouracil (5-FU) within 24 hours was the highest, reaching 77.24%.

Abstract:Highly oriented carbon nanotube arrays have good electrochemical properties such as large capacity, excellent rate performance and long cycle life due to their superior conductivity, high specific surface area and well-developed porous structure. Carbon nanotube arrays show great potential in electrochemical applications. The preparation of carbon nanotube arrays is introduced. Recent advances in the electrochemical applications of carbon nanotube arrays are reviewed in the fields of electrochemical storage, electrochemical catalysis and electrochemical sensors. The problems of carbon nanotube arrays in electrochemical applications are analyzed, and the future research direction of carbon nanotube arrays is proposed.

Abstract:A traditional copolymer pour point depressant PSMS was prepared by radical polymerization of stearyl acrylate, maleic anhydride and styrene monomers with azobisisobutyronitrile as initiator. In order to improve the pour point depressant effect and stability of the polymer, the organically modified montmorillonite (OMMT) and the polymer pour point depressant PSMS were selected for solution intercalation and composite to prepare the nanocomposite pour point depressant PSMS/OMMT. It was applied to Karamay crude oil for effect evaluation, and the mechanism of pour point depressurization was preliminarily elucidated with the help of Polarizing microscope (POM) and other tests. Studies have shown that the addition of 10% (based on monomer quality) of modified montmorillonite and the use of 0.1%(based on crude oil quality) of PSMS/OMMT can reduce the pour point of Karamay crude oil by 25 °C, and the viscosity reduction rate reaches 65.7%; compared with pure polymer pour point depressant, the usage is reduced by 1/3, the pour point decreased by 3°C, the viscosity reduction rate is increased by about 10%, and anti-aging performance has also been greatly improved.

Abstract:A carboxyl terminated hyperbranched macromonomer HPAE-C was prepared from diethanolamine (DEA), methyl acrylate (MA), trimethylolpropane (TMP) and maleic anhydride (MAH). And quaternary polymer thickener PHPAE-C was synthesized from HPAE-C, acrylamide (AM), acrylic acid (AA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) by aqueous solution polymerization .The structure of PHPAE-C was characterized with FTIR spectrum and1H-NMR spectrum, and the major performance and crosslinking ability of PHPAE-C were evaluated. The results showed that the viscosity of thickener solution with the concentration of 3000 mg / L was 846.7 MPa·s (The Shear rate is 7.34 s-1, 25℃), when the temperature rose to 90 ℃, the viscosity was still 570 MPa·s, and when the concentration of Na+ is 6000 mg/L and the concentration of Ca2+and Mg2+ was 600 mg/L, the viscosity was still more than 300 MPa·s.The above data showed that PHPAE-C had good viscosity increasing, temperature resistance, salt resistance and shear resistance; The optimum conditions of crosslinking were as follows: the crosslinking ratio was 100∶0.06, the crosslinking temperature was 55 ℃ and pH = 5. The performance of the fracturing fluid with the best crosslinking effect was evaluated. It was obtained that the viscosity of the system was about 450 MPa·s after continuously shearing at 120 ℃ for 80 minutes, and it was a low damage fracturing fluid system with good sand suspension and gel breaking performance.

Abstract:With ethylene glycol monovinyl ether (EPEG) as the major monomer, acrylic acid (AA) as the minor monomer, and 2- hydroxyethyl methacrylate (HEMAP) or blocked amide phosphate (CAP) as the functional monomer, two EPEG mud-resistant polycarboxylate superplasticizers PCE-EP1 and PCE-EP2 were synthesized by free radical copolymer-ization in aqueous solution. The structure of superplasticizer was characterized by FTIR and 1HNMR. The dispersion and anti-mud performance of the synthesized superplasticizer to cement were tested by the fluidity of cement paste. Combined with XRD and XPS, the interaction mechanism between superplasticizer and cement and montmorillonite was explored. The results show that when the dosage of superplasticizer is 0.2% and the dosage of montmorillonite is 2%, PCE-EP1 and PCE-EP2 have certain mud resistance. XRD shows that the water reducing agents PCE-EP1 and PCE-EP1 have no intercalation adsorption on montmorillonite, thus improving the dispersing ability of the water reducing agent to soil.

Abstract:Conductive fabrics have broad prospects in the field of wearable electronics, however, the stability in the use process still needs to be improved. Cotton fabric (CF) was grafted by condensation reaction γ- Mercaptopropyltrimethoxysilane (MPTS), and then silver particles were deposited by electroless plating to prepare cotton fabric electrode (Ag/M-CF). The surface square resistance of Ag/M-CF is as low as 0.04 Ω/sq, and it has good stability in many aspects (washing, stretching, bending and oxidation). After 200 washing cycles, the surface resistance is only 1.88 Ω/sq, which meets the actual application requirement; after 5% stretching, the surface square resistance is only 1.00 Ω/sq; after 3000 bending cycles, the surface square resistance of Ag/M-CF increases to 1.38 Ω/sq; after 9 weeks in constant temperature and humidity environment, the surface square resistance is only 0.50 Ω/sq; When Ag/M-CF before and after washing is implanted into smart clothing, the electrocardiogram (ECG) signal of human body in motion can be successfully captured, and the measured heart rate is almost the same. In addition, Ag/M-CF also has good mechanical properties and antibacterial properties.

Abstract:Using bacterial cellulose (BC), polyvinyl alcohol (PVA) as raw materials, the superstretched gel electrolyte was prepared by 3D printing and freeze-thaw cycle method. The physical, electrochemical and tensile properties of gel electrolytes were characterized by SEM, contact angle measurement, XRD, EIS and tensile test. The experimental results show that when m(BC)∶m(PVA)=0.6∶1, the gel electrolyte prepared based on 3D printing has a stable three-dimensional network structure, excellent tensile properties and electrochemical performance, the tensile strength can reach 0.9 MPa, and the elongation at break can reach 961%, the ionic conductivity is 1.10×10-1 S/cm. The gel electrolyte is applied to flexible aluminum-air battery, the power density can reach 21 mW/cm2. When the current density of aluminum-air battery is 20 mA/cm2, the specific capacity of aluminum anode is 1124 mA?h/g, and the battery can discharge stably for 90 minutes.

Abstract:N,N'- hexylbispyrrolidinone was synthesized from γ-butyrolactone and hexanediamine. Its boiling point is 440-450 ℃. The reaction conditions were optimized. It was found that the yield of the product was 76.22% with the molar ratio of ester to amine 2.5:1, 280℃, 2 h. The purified product was characterized by elemental analysis, GC-MS, HNMR，IR. It was confirmed that the synthetic product was N,N'- hexylbispyrrolidinone. The aromatics extraction performance of N,N'- hexylbispyrrolidinone was preliminarily studied, the liquid-liquid ternary phase diagram showed that N,N'- hexylbispyrrolidinone has excellent aromatics selectivity and good solubility. The aromatic extraction properties of N,N'- hexylbispyrrolidinone at different extraction temperatures were also investigated. With the increase of extraction temperature, the selectivity of N,N'- hexylbispyrrolidinone for aromatics extraction decreases and the solubility increases, but the overall change is small and the solvent performance is relatively stable. The experimental results show that N,N'- hexylbispyrrolidinone is feasible to be used as aromatics extraction solvent for reforming gasoline and diesel oil.

Abstract:The oxygen and moisture resistance of packaging materials are highly related to the life of electronic products, the conversion efficiency of solar cells and the shelf life of food. It is critical to develop biodegradable barrier materials for packaging responding to the goals of double-carbon target and ban on free plastic bags. Recently, cellulose has been widely used in flexible packaging due to the advantages in abundant resources, renewability and barrier properties. Our current study integrated research progress of cellulose-based barrier materials over the years mainly aiming to different sizes, structures and physicochemical properties of cellulose. We further elucidated the preparation and properties of oxygen and moisture resistance among barrier films, regenerated cellulose、cellulose derivatives and nanocelluloses according the diversity of in barrier mechanisms. Especially, comparative analyses were employed to explore performance of composite barrier films between different cellulose matrices or functional fillers. Meanwhile, we summarize the advanced applications of cellulose-based barrier films in the field of packaging and the challenges in the development process of multi-component cellulose-based packaging barrier film materials are prospected.

Abstract:MXene is an intriguing new class of 2D transition metal carbide and/or carbonitride, which can be obtained by etching the active metal element in the MAX with the help of hydrofluoric acid, lithium fluoride with hydrochloric acid or inorganic fluoride. MXene has high specific surface area, high conductivity, excellent optical, electrical, and mechanical properties. After introducing MXene, the coating can obtain the properties of photothermal conversion, conductivity, reinforcement, flame retardant and antibacterial to broaden their application in the fields of sensors, special protection, and so on. Firstly, this paper reviews the preparation methods of MXene, including hydrofluoric acid etching, modified acid etching, molten fluoride etching and fluorine-free etching. Meanwhile, the influence of exfoliation on MXene is discussed. Then, three modification methods which can improve the surface reactivity, electrical and stability of MXene are introduced in detail, namely intercalation modification, doping modification and antioxidation modification. In addition, their applications in sensors, electromagnetic shielding, photothermal and other functional coatings are summarized. Finally, the future re-search direction and development prospect on the functional application of MXene are prospected.

Abstract:polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) were used as passivators to prepare PVP/PEG/Cu composite nanoaggregates (CuNP) by in-situ coating copper nanoparticles. Then, CuNP, as a thermal conductivity enhancer, were introduced into the phase change system to prepare CuNP/PEG solid-liquid phase change materials (CuNP/PEG PCMs). FT-IR, XRD, DSC and TGA were used to investigate the interaction and thermal properties of the PCMs. The physical interaction between the PVP coated on the nanoaggregate and the working material PEG, and the protective effect of PVP ensured that the PCMs exhibit stable performance, good thermal cycle stability and service life. The results showed that the introduction of CuNP significantly improved the thermal conductivity of the PCMs and accelerated the crystallization of the working material as a crystal nucleus. When the mass fraction of CuNP was 5%, the phase change enthalpy of the solid-liquid PCMs was 157.0 J/g, and the material also exhibited strong thermal stability under 370°C. The heat accumulation rate, heat release rate, and crystallization rate were increased 34.09%, 31.45%, and 55.33%, respectively, when comparing with the pure PEG.

Abstract:Water is the source of life, but trace water in organic solvents is considered as contaminate. In recent years, explosions caused by trace water in organic solvents have occurred frequently in factories and laboratories, which have attracted great attention from the society. Thus, a convenient method for assessing the water content in organic solvents is desired, urgently. As an emerging analytical tool, organic fluorescent probes offer high sensitivity, good selectivity, low toxicity, real-time visual monitoring and are commonly used in chemical engineering, food, environment, and other fields. This review summarizes fluorescent probes for detecting water content in organic solvents and their applications in foodstuff and other industries since 2016. It focuses on seven strategies for responding to water, which has certain guidance for the development of water content probes.

Abstract:Antibacterial composite film was prepared by blending fish scale gelatin (SG) and chitosan (CS) as raw materials and lavender essential oil (LEO) as antibacterial agent. The morphology and structure of the composite film were characterized by Fourier infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermogravimetric analysis, and the mechanical, optical, barrier and antibacterial properties were tested and analyzed. The results showed that LEO was well combined with SG/CS base film. Compared with the SG/CS base film, when the content of LEO was 1%, the composite film had good mechanical strength (26.36 MPa) and the elongation at break increased by 12.96%; The transparency decreased to 70.50%; The water resistance and water vapor barrier performance were significantly enhanced, and the water content, water solubility and water vapor transmittance decreased by 22.48%, 30.49% and 26.03% respectively; The DPPH radical scavenging rate was increased by 247.88%, the oxidation resistance was significantly improved and had a good inhibitory effect on E. coli and S.aureus.

Abstract:The foam fractionation of quinoa protein was optimized by response surface methodology, based on the single-factor test, Box-Behnken design was adopted to investigate the influence of four factors: the ratio of material to solvent, the loading liquid volume, temperature, and pH value on recovery and enrichment ratio of quinoa protein, and the subunit distribution and functional properties of quinoa protein were studied. The optimum conditions for the foam fractionation of quinoa protein were found to the temperature of 35.30℃, pH value of 3.98, the loading volume of 259.61 mL, the ratio of material to solvent of 0.29 mg·mL-1, under the conditions, the recovery of quinoa protein was 96.71% and the enrichment ratio was 7.27. The actual process was considered, the optimization process was the temperature of 35℃, pH value of 4.0, the loading volume of 260 mL, the ratio of material to solvent of 0.3mg·mL-1, under the conditions, the recovery of quinoa protein was 95.68% and the enrichment ratio was 7.89. The SDS-PAGE analysis showed that quinoa protein had basic subunits with molecular weights of 50, 32~39, 22~23, and 8~9 kDa. The functional properties and antioxidant activity of quinoa protein were studied, and the results showed that the highest water-holding capacity of quinoa protein was 9.733 g/g at 60℃, and the highest oil-holding capacity was 5.848 g/g at 60℃. With the increase of the ratio of material to solvent, the emulsifying capacity (EC), emulsion stability (ES), the foaming capacity(FC), and foam stability (FS)of quinoa protein tended to increase and then decreased.The scavenging rate of DPPH radical was positively correlated with the dose. When the concentration of quinoa protein was 2.5mg/mL, the scavenging rate of DPPH radical reached (56.01±1.34)%.

Abstract:Interfacial interaction is an important factor determining the properties of polymer composites. Firstly, ultilized two-step reactions of silane coupling agent and maleic anhydride, the surface modification of layered aluminum phosphate (LAP) was prepared; then chain extended bismaleimide (BMI) resin prepolymer was obtained by 4, 4' -bismaleimide diphenylmethane (BDM) and 2, 2' -diallylbisphenol A (DABPA) reaction; finally, LAP/BMI composites was successfully prepared by mechanical blending and thermal curing. It was found that continuous, tight and low-defect interface binding was formed between modified LAP (m-LAP) particles and BMI matrix. Compared with pure BMI, the bending and tensile strength of m-LAP/BMI-3.5% composites at room temperature are 173.37 MPa and 86.79 MPa, which are increased by 15.14 % and 30.6 %, respectively. After heat treatment at 300 ℃ for 6 h, the bending strength of m-LAP/BMI-3.5 composites can still maintain 71.22 % of the normal temperature strength, which is much higher than that of pure BMI resin after heat treatment. The glass transition temperature (Tg) of m-LAP/BMI composites was increased to 234~240 ℃. The dielectric constant and dielectric loss of m-LAP/BMI-3.5 composite are 4.46 and 0.05 respectively. Therefore, the two-step surface modification can significantly improve the overall properties of LAP/BMI composites.

Abstract:A series of quaternary ammonium salt-type gelators were designed, and two gelators with different self-assembly modes were obtained only by modulating the length of quaternary alkyl side chains. The self-assembly patterns of the xerogels were investigated by FTIR and XRD. This two xerogels had opposite surface zeta potentials and achieved selective adsorption of anionic and cationic dyes through electrostatic interaction. In binary anionic-cationic mixed dyes, xerogel with negatively charged surfaces preferentially captured cationic dyes, while xerogel with positively charged surfaces captured anionic dyes. Particularly, the xerogel with a negative surface charge showed excellent adsorption performance on crystal violet, with the equilibrium adsorption amount up to 1313.16 mg/g in 60 min. By loading the xerogel on the surface of melamine sponge skeleton, and the obtained modified sponge adsorbed the same kinds of dyes as the xerogel modified on it. And the adsorption capacities of the dyes were all significantly higher than those xerogels, especially the adsorption capacity for crystal violet reached 2488.22 mg/g.

Abstract:Photocatalytic technology and photo-Fenton technology are effective means to solve the problems of environmental pollution and energy shortage, and photocatalyst is the research core. Due to its potential in photocatalytic energy conversion and environmental purification, perovskites have become a research hotspot of new photocatalytic materials. In this paper, the characteristics of perovskites, the influencing factors of activity and the development status of them were reviewed. The application progress of perovskite-type photocatalysts in dye wastewater treatment, ammonia nitrogen wastewater treatment, metal ion redox, atmospheric pollutant purification and soil organic matter and heavy metal removal were summarized. The challenges and future development directions in practical application were discussed. Finally, it is pointed out that the key problems in the current development of perovskite photocatalysts are the development of energy-saving green preparation methods, the development of new composite perovskite-type photocatalysts, especially high specific surface area perovskite matrix materials, and the construction of reactors for the characteristics of perovskite-type photocatalysts.

Abstract:Vesicles composed of phospholipids and block copolymers combine the advantages of liposomes and polymers while overcoming their respective disadvantages. In this study, phospholipid - block copolymer hybrid vesicle was assembled from polycholesterol methacrylate - block - dimethylaminoethyl methacrylate copolymer (PCMA-B-PDMAEMA) and phospholipids. The morphology, size distribution and zeta-potential of the phospholipid - block copolymer hybrid vesicle were measured. The cytotoxicity and internalization of selected phospholipid - block copolymer hybrid vesicles were measured using RAW 264.7 mouse macrophages. The cell viability of A3 and A8 co-cultured with macrophages were 93.4±1.1% and 92.1±0.8%, which were relatively higher than other hybrid vesicle samples. These results demonstrate that P2 polymer is more suitable than P1 for preparing hybrid vesicles for drug carrier research. Through fluorescence intensity test, A18 was more easily absorbed by macrophages than A16, and DOX loaded with anti-cancer drug was used to treat human kidney cancer cells (OS-RC-2). When DOX final concentration was 3.00 μmol/L, the inhibition rate of OS-RC-2 cancer cells was 75±1.1%.

Abstract:Dimethyl carbonate (DMC) is a widely used as green chemical raw material. Methanol oxidation carbonylation synthesis of DMC is one of the most important synthesis methods of DMC, which has the advantages of high product selectivity, low reaction temperature, atomic economy. The progress of halogen containing copper catalyst and halogen free copper catalyst for methanol oxidation carbonylation to dimethyl carbonate is reviewed. The reaction mechanism of halogen-free catalysts and the influence of activated carbon, graphene and molecular sieve on catalytic performance are discussed emphatically. It was found that the mesoporous structure, defect sites and surface groups in the support could enhance the interaction between Cu and the support, also could inhibit the agglomeration and loss of Cu species and the oxidation of active Cu species, thus the catalytic performance was improved.

Abstract:A chitosan quaternary ammonium salt crosslinked amide copolymer (CC-GPPC) was prepared by aqueous copolymerization using adipic acid (AA) and diethylenetriamine (DETA) as raw materials, glycidyl methacrylate (GMA) as crosslinking monomer and hydroxypropyl trimethylammonium chloride chitosan (CC) as cationic monomer. The structure and stability of CC-GPPC were characterized by IR, SEM, TG and GPC. The effects of DETA, CC and GMA monomers dosage on the properties of CC-GPPC and the physical properties of paper after sizing were discussed. The results showed that when the content of CC was 1.0g and the molar ratio of AA:DETA:GMA is 1:1.1:0.9, the better performance of amide polyamine copolymer CC-GPPC can be prepared. At this time, the molecular weight of the polymer solution is 74520, the average particle size is 795 nm, and the dispersion index(PDI) is 0.581, it can be stably stored for more than 60 days at room temperature. when the amount of CC-GPPC is 0.6% of the total dry pulp, the dry and wet tensile indexes of paper were 52.99N.m/g and 15.21N.m/g, respectively. Compared with base paper, the dry and wet tensile indexes of paper increased by 29.8% and 63.4% respectively, paper wet-strength performance significantly improved, compared with commercial PAE wet strength resin, chlorine free and superior performance, paper wet resistance to tensile index increased 10.9%, CC-GPPC is a green paper wet-strength agent.