Abstract:Abstract: Magnesium-ion batteries emerge as a promising candidate in the energy storage field because of its high specific capacity, rich resources, environmental friendliness and excellent safety (dendrite-free). However, the magnesium metal anode is easily passivated in the liquid electrolyte, resulting in the poor electrochemical performance. Therefore, developing highly efficient and applicable solid electrolytes is essential for the realization of high-performance and practical magnesium ion batteries. In recent years, polymer based solid electrolytes have been rapidly developed. This article reviews the ionic conductivity of polymer-based magnesium ion solid electrolytes at home and abroad, the contribution to solving the passivation effect of magnesium metal anodes, and the research progress of its application in magnesium ion batteries. This article summarizes recent advance in polymer-based magnesium ion solid electrolyte, in terms of ionic conductivity, contribution to solving the magnesium anode passivation and application in Mg-ion batteries. Polymer electrolyte has excellent mechanical/electrochemical/thermal stability, high ionic conductivity, and low cost. However, the high charge density and strong solvation of magnesium ions limit its dissociation and diffusion in solid electrolytes. Also, the surface passivation issue of Mg metal anode has not been fully addressed in polymer-based solid electrolyte. This review will enable researchers to quickly grasp the current challenges and feasible solutions in the research of solid magnesium ion electrolytes, and provide guidance for the development of electrolytes in the future.

Abstract:Pesticides are used to inhibit fungi, prevent insect pests and regulate plant growth mechanism. the analysis of pesticide residues is of great significance to promote the sustainable development of agricultural products. Surface-enhanced Raman spectroscopy (SERS) has the advantages of non-invasion, high sensitivity and fingerprint recognition. Using precious metal nanomaterials with excellent plasma properties as the substrate, single-component or complex multi-component trace pesticide residues can be analyzed and detected. However, this kind of nanoparticles with high surface energy are easy to agglomerate, in order to solve this problem, researchers at home and abroad have proposed to introduce cellulose, polymers and carbon materials with large voids to support and fix the surface modified precious metal nanomaterials to provide spectral enhancement. In this paper, the common preparation methods and applications of different types of flexible SERS substrates (cellulose, transparent tape, polymers, biomass materials, carbon materials, etc.) were reviewed, and the latest research progress in the application of flexible SERS substrates to different pesticide residues was introduced by making full use of the advantages of SERS fingerprint analysis. Finally, the problems to be solved urgently for the development and application of SERS technology are put forward.

Abstract:Modified biochar prepared by ball milling mechanochemical technology has the advantages of low cost, high productivity, green solvent-free and so on. It has been widely concerned by researchers in recent years. Ball milling modification can increase the surface functional groups, expand the specific surface area and improve the adsorption capacity. It makes biochar have excellent removal performance for environmental pollutants and broad application prospect in the field of environmental remediation. This paper introduces the preparation and physicochemical characteristics of ball milling modified biochar, summarizes the latest progress of ball milling modified biochar in the removal of pollutants in environmental remediation, and defines its removal mechanism of various pollutants. On this basis, the existing problems and limiting factors of ball milling modified biochar in environmental remediation are discussed. The future research directions are put forward from the aspects of clarifying the economic and technical feasibility, expanding the application scope of materials, clarifying the potential ecological and environmental risks, to provide reference for the basic scientific research and application technology development of ball milling modified biochar.

Abstract:Periodic mesoporous organosilicas (PMOs) represents a class of bridging organic-inorganic hybrid mesoporous materials, which are prepared by sol-gel self-assembly of sesquisiloxane as precursor in the presence of structural directing agent. By bridging different organic groups, the physical and chemical properties of the materials can be changed to obtain mesoporous carrier materials with adjustable pore size, high specific surface area, good biocompatibility, low cytotoxicity, good hydrothermal stability, and easy surface and internal modification. PMOs are widely used in drug and gene delivery, tumor cell targeting and imaging, and drug irritant response release, etc. This paper reviewed the preparation methods, types and characteristics of PMOs, and summarized their application in biomedicine, in order to provide reference for the synthesis of PMOs and their application in biomedicine.

Abstract:SDS, CTAB, HT A-103 and OP-10 with the concentration of 0.1 wt% were incorperated into multi-walled carbon nanotubes(MWCNTs) dispersions, respectively. And these four surfactant/MWCNTs solutions were treated by ultrasonic waves for further dispersion. After that, the Zeta potential, SEM were employed to characterize the dispersion, revealing the intermolecular micromechanical mechanism. At the same time, the adsorption methods of various surfactants on the surface of MWCNTs and their influence on the dispersion performance were obtained. The results show that: The best dispersion effect of MWCNTs is achieved at the concentration of SDS, CTAB, HT A-103 and OP-10 at 0.3wt%, 0.04wt%, 0.025wt%, 0.055wt%, respectively. And the dispersibility of surfactants-modified MWCNTs is: CTAB>HT A-103>OP-10>SDS; the dispersibility of each system first increases and then decreases with the increase of surfactant concentration. Both surface potential and steric hindrance of surfactants-assitied MWCNTs are higher than the other, in which CTAB molecules can form a double layer adsorption on the MWCNTs through electrostatic force, van der Waals force, and hydrophobic force. Compared with SDS, HT A-103 can endow MWCNTs with a higher surface potential, and enhance the adsorption performance by virtue of the π-π interaction between the benzene ring and the MWCNTs.

Abstract:By esterification of maleic anhydride (MAH) with flax fiber (LF) C6-OH, LF (LF-g-MAH) containing carboxyl group was prepared and the carboxyl group esterified again with the hydroxyl of hydroxylated multi-wall carbon nanotubes (MWCNT-OH) get the carbon nanotubes (CNTs) chemically grafted LF (LF-g-MAH-MWCNTs) with electrical conductivity and pressure sensing properties. The successful grafting was confirmed by FTIR and EDX. The effects of the grafted carbon nanotubes on the crystallization properties, surface properties, combustion properties and mechanical properties of LFs were studied by XRD, SEM, LOI and stress-strain curves, respectively. The electrical conductivity and pressure sensitivity of the LFs grafted carbon nanotubes were tested. The results show that the grafted carbon nanotubes have no obvious effect on the crystallization properties, surface morphology, combustion properties and mechanical properties of LFs, but making the non-conductive LFs have electrical conductivity and stable and sensitive pressure sensing properties. The pressure sensor can generate a resistance change of 1.0~1.5 kΩ pressed by index finger or generate a resistance change of 10~70 kΩ stepped on by a subject weighing 60 kg to 80 kg.

Abstract:Three dimensional (3D) flower ball Ti3C2/TiO2 composite photocatalyst was derived from two-dimensional (2D) layered Ti3C2. The materials were characterized by XRD, SEM, TEM, UV-Vis DRS and PL analytical methods, and the photocatalytic activity of Ti3C2/TiO2 synthesized at different temperatures was compared. The results showed that Ti3C2/TiO2 synthesized at 500 ℃ showed better photocatalytic degradation efficiency for acid fuchsin (AF). After 90 min of light reaction, the degradation rate reached 97.57%. With its high conductivity and Schottky barrier formed at the interface with TiO2, Ti3C2 effectively improves the charge separation rate, inhibits the electron hole recombination, and improves the photocatalytic activity of the material. In addition, the photocatalyst has good stability. After repeated cycles of use for 5 times, the AF degradation rate can still reach 86.39%. Active species capture experiments show that holes (h+) and superoxide radicals (·O2-) are the main active substances that degrade AF. This study reveals the enhancement mechanism of Ti3C2 to the improvement of photocatalytic performance, and provides a relevant reference for the application of MXene materials in the field of photocatalysis.

Abstract:TA-MoS2 modified waterborne polyurethane (TMPU) was prepared by using polyadipate-1,4-butanediol ester diol (PBA), isophorone diisocyanate (IPDI), 2,2-dimethylpropionic acid (DMPA) as the main raw material and tannic acid stripped nano-molybdenum disulfide aqueous solution (TA-MoS2 aqueous solution) as the modifier. Then, MoS2 loaded PHMG antibacterial waterborne polyurethane (P-TMPU) was prepared by immerging TMPU film in 2% (based on the mass of water, the same below) polyhmethylene guanidine hydrochloride (PHMG) aqueous solution. The results of DLS, SEM and AFM showed that TA successfully stripped MoS2 with good dispersion. The TMPU emulsions were analyzed and characterized by FTIR, TG, SEM, contact angle and other methods. The results showed that the thermal decomposition temperature at 30% weight loss (T30%) and thermal decomposition temperature at 50% weight loss (T50%) of the film modified by adding 60mL TA-MoS2 aqueous solution were 324.9 and 354.9, respectively, and the water contact angle was 91.1℃. Compared with the unmodified film without TA-MoS2 aqueous solution, the T30% and T50% increased by 6.4℃ and 11.4℃, respectively, and the water contact angle increased by 27.9℃. The antibacterial test of P-TMPU film showed that the antibacterial rate of the film soaked in 2% PHMG aqueous solution to Escherichia coli and Staphylococcus aureus reach more than 99%, and it could be widely used in textile, leather, furniture and other fields.

Abstract:In this study, using micron diatomite and nanometer alumina particles as raw materials, the surface with a certain rough structure was constructed. Using cetyltrimethoxysilane (HDTMOS) as low surface energy modifier and epoxy resin as adhesive, the diatomite /Al2O3 composite superhydrophobic coating was prepared. Firstly, diatomite and alumina particles were surface modified by HDTMOS hydrolyzate, and then epoxy resin solution was added to obtain suspension. The suspension was sprayed on the surface of the substrate by spraying method, and the superhydrophobic coating was obtained after heating and curing. The optimum preparation process (V(HTDMOS)∶V(ethanol)=0.04∶1; m (diatomite)∶ m (Al2O3) =1.5∶0.8; m (E51)∶ m(acetone) =1∶5), the water static contact angle of the surface is as high as 163.4°, and the surface is characterized by uniform microstructure by scanning electron microscopy. The coating is suitable for filter paper, wood block, stainless steel plate and other substrates, which can show excellent superhydrophobic properties. Meanwhile, the surface water static contact angle of the coating is still as high as 146.3° after 100 cycles of wear experiments.

Abstract:Self-healing and flame retardant waterborne polyurethanes (WPU) consisting of isophorone diisocyanate (IPDI) and polypropylene glycol (PPG), 2-Hydroxyethyl disulfide (HEDS) and OP550 were prepared. The effect of OP550 on self-healing ability of waterborne polyurethanes was studied. And the result showed that when the OP550 content is up to 20%, the limiting oxygen index reached 29.0% which is increased by 7.4% in comparison to HWPU; the healed tensile strength is 4.71 MPa and self-healing efficiency is 107.9% for 3 h at 80 ℃.

Abstract:Two luminescent materials with 1,3,6,8-tetramethylcarbazole (TMCz) donors and 1,3,4-oxadiazole (OXD) or 1,3,4-thiadiazole (THD) acceptor, namely TMCz-OXD and TMCz-THD, were designed and synthesized. The photophysics, electrochemical properties and electroluminescence were characterized by UV-vis absorption and emission spectroscopy and electrochemical analysis. Experiment results show the steric hindrance caused by two methyl groups on the 1,8 sites of TMCz can effectively increase the dihedral angle (86?) between donor and acceptor. Both doped films of TMCz-OXD and TMCz-THD exhibited thermally activated delayed fluorescence (TADF) character. And the external quantum efficiencies (EQEs) of the corresponding electroluminescence were 6.5% and 6.4%, respectively. As a versatile blue TADF material donor, TMCz can be applied widely in the field of organic light-emitting diode (OLED).

Abstract:In this paper, two allyl compounds (EUPH and EUIS) were prepared from eugenol (EU), phthaloyl chloride (PH-Cl) and m-phthaloyl chloride (IS-Cl) and their molecular structures were respectively characterized by FTIR, 1H NMR and 13C NMR. Two thiol-ene click polymers (TCPs, EUPH/4SH and EUIS/4SH) were respectively obtained by curing with pentaerythritol tetrakis(mercaptopropionate) (4SH) and their thermal properties, thermomechanical properties, mechanical properties and thermal stability of EUPH/4SH and EUIS/4SH were respectively confirmed by DSC, DMA, universal material testing machine and TGA. The results showed that EUPH/4SH exhibited better thermal and mechanical properties. Specifically, its glass transition temperature (TgDSC) was 65.4 oC, and the tensile strength and tensile modulus of EUPH/4SH were 61.4 MPa and 1.4 GPa, respectively. These excellent comprehensive properties of EUPH/4SH are due to the unique rigid molecular structures of EUPH and the high network crosslinking density of EUPH/4SH. Moreover, the cytotoxicity grade of EUPH/4SH was grade 0 by MTT method, which demonstrates that it has potential application in biomedical materials.

Abstract:(NH4)2V10O25?8H2O(NVO) pure phase was synthesized by hydrothermal method with NH4VO3 as the vanadium source and C2H2O4?2H2O as the reducing agent. Al3 pre-intercalation modification Al(NO3)3?9H2O as aluminum source (Al-NVO). The phase and morphology of the material were characterized by XRD, SEM, TEM and EDS. The results show that Al3 is uniformly dispersed in the material, and the pre-embedding of Al3 changes the morphology of the material from the densely stacked sheet structure to the finer and more dispersed nanosheet structure. Electrochemical performance tests such as constant current charge and discharge, cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT) showed that Al3 pre-embedding could effectively improve the capacity, rate performance and cyclic stability of the material. The initial discharge specific capacity of the sample Al-NVO material was 329 mAh/g at the current density of 0.5 A/g. After 100 cycles, the specific capacity was 252 mAh/g. At the current density of 2.0 A/g, the capacity is still 122.8 mAh/g after 1200 cycles, and the capacity retention rate is as high as 94.6 %. Through the calculation of cyclic voltammetry and pseudo capacitance at different scan rates, the interlayer pre-embedded Al3 effectively improves the diffusion kinetics of Zn2 and the electrochemical performance of the material.

Abstract:We designed a petal-like QL@ZnO material by hydrothermal method, which was obtained from quaternized lignin(QL) and zinc acetate. It was combined with a UV-curable polymer dye synthesized with PTEA and DR60 and applied to textiles by screen printing. The structure and performance of URPD were analyzed by FTIR, GPC, DSC, etc. The results showed that QL@ZnO/URPD printed fabric obtained by UV-curing had good color fastness (4-5~5 grade). Due to the synergistic effect of QL and ZnO, the UPF value of the QL@ZnO/URPD printed fabric reached 128.49.

Abstract:The essential oils of Artemisia verlotorum and Artemisia argyi from Tangyin County were extracted by steam distillation (SD) and supercritical fluid extraction combined molecular distillation (SFE-MD), and then the chemical components were determined and analyzed by gas chromatography-mass spectrometry (GC-MS). Meanwhile, their antibacterial activities were examined. The results showed that the yield of essential oil extracted by SD was 1.3~2.6 times higher than that by SFE-MD. The main components of Artemisia verlotorum essential oil were β-caryophyllene, endo-borneol, caryophyllene oxide and germacrene D, etc., while the main components of Artemisia argyi essential oil were eucalyptol, terpinene-4-ol and neointermedeol, etc. The essential oil of Artemisia argyi was mainly monoterpenoids, while Artemisia verlotorum essential oil contained more sesquiterpenoids. SFE-MD would lead to the loss of some monoterpenoids, such as eucalyptol. The wormwood leaf essential oil had an excellent bacteriostatic and bactericidal effects on Escherichia coli, Staphylococcus aureus and Candida albicans. The order of antibacterial effect was,Artemisia argyi essential oil > Artemisia verlotorum essential oil.

Abstract:In order to explore the volatile aroma components of tangerine peel, solvent assisted flavor evaporation (SAFE) method was used to extract volatile components from tangerine peel. Gas chromatography-mass spectrometry (GC-MS) and gas chromatography olfactometry (GC-O) were applied to identify the volatile flavor compounds in the natural dried tangerine and Jiuzhi dried tangerine. The results showed that a total of 93 volatile compounds and 46 aroma active compounds were identified in the natural dried tangerine and Jiuzhi dried tangerine. In order to determine the key aroma compounds, aroma extract dilution analysis (AEDA) method was used to further analyzed the aroma active compounds of two kinds of tangerine peel. The results showed that terpenes, alcohols and aldehydes were the main aromatic active compounds. Among them, limonene and camphene were the common key aroma components. In addition, 1, 4-dimethyl-4-acetyl-1-cyclohexene, nerolol, citronellol, myristic aldehyde and α -sweet orange aldehyde were the key aroma components the in the natural dried tangerine. However, vanillin, carvannol, perillol, linalor, carvone and β -ziroone were the key aroma components of Jiuzhi dried tangerine. Through the comparative analysis of the key aroma components of two kinds of tangerine peel, the aroma components contributing to the flavor of the two kinds of tangerine peel and their different components were determined, which provided theoretical support for the development of tangerine peel products.

Abstract:Using H2Ti3O7 nanowires as precursors, yM/TiO2 catalysts（M=Fe, Co, Ni, y = 0.25%, 0.75%, 1.25%, 1.75%, 2.25%）with different metal-doped were prepared by simple ion exchange and high temperature calcination. yM/TiO2 catalysts were characterized by XRD, SEM, TEM and XPS. The results showed that the doped metal elements were evenly dispersed on the surface of the prepared TiO2 nanowire matrix. The morphology of yM/TiO2 catalysts were nanowire/nanorod. The incorporation of metal ions caused the distortion of local lattice in the TiO2 Crystal structure, resulting in the formation of more oxygen vacancies on the catalyst surface and improved the catalytic activity. The catalytic performance of yM/TiO2 in the synthesis of N-methylmorpholine (NMM) to N-methylmorpholine-N-oxide (NMMO) with H2O2 as oxidant was investigated. The results showed that when the doped metal Fe content was 1.75%, the surface defect oxygen content of the catalyst was as high as 16.86%, and the catalytic performance was the best. The yield of NMMO reached 97.5% after reaction at 35 ℃ for 3 h.

Abstract:The lignin from moso bamboo was fractionated mildly and efficiently using formic acid / guanidine hydrochloride acidic deep eutectic solvent (DES). The structure, thermal stability and antioxidant activity of the lignin were characterized. It was found that formic acid / guanidine hydrochloride (molar ratio was 4:1) DES resulted in a high lignin yield of 59.31% under mild conditions (100 ℃, 2 h) and further increased to 73.98% at 120 ℃. This was attributed to the acidic DES donated active protons to selectively cleave β-O-4、β-β、β-5 bonds and further facilitated a large amount of lignin removal. The following lignin profiling indicated that the lignin had a high purity (>96.6%), low molecular weight (Mw=1040~2040 g/mol), low polydispersity (PDI<1.5), homogeneous structure, excellent thermal stability. The antioxidant performance of the lignin (IC50=0.016~0.045 mg/ml) was better than that of the commercial antioxidant butylated hydroxytoluence (IC50=0.056 mg/ml).

Abstract:To investigate the preventive effect and related machanism of 7,8-dihydroxyflavone (7,8-DHF) nanoparticles on metabolic syndrome (MetS), C57BL/6J female mice fed with two different dietary patterns (high-fat and low-fat) were intervened with 7,8-DHF nanoparticles (constructed using turnips polysaccharide as wall material) for 24 weeks. The dose of 7,8-DHF and its nanoparticles were all 10 mg/kg· body weight (BW) (based on the relative mass fraction of 7,8-DHF). At the end of the intervention, related MetS indexes, inflammatory factors and ovarian reserve function were determined by molecular biology techniques. It was shown that both 7,8-DHF and its nanoparticles could alleviate symptoms of MetS: significantly (P < 0.05) down-regulated the excessive body weight gain induced by high-fat diet (HFD) in mice, compared with the HFD control group, the body weights of mice in 7,8-DHF and 7,8-DHF nanoparticle groups decreased by 8.5% and 16.4%, respectively; obviously (P < 0.05) improved blood lipid, fasting blood glucose and insulin levels; markedly improved glucose tolerance and insulin sensitivity of mice; In addition, the 7,8-DHF nanoparticles constructed with turnips polysaccharide exhibited a better anti-MetS effect compared with 7,8-DHF alone. Furthermore, it was found that 7,8-DHF and its nanoparticles could significantly reduce the levels of circulating lipopolysaccharide (LPS), tumor necrosis factor alpha (TNF-α) and interleukin-6 (IL-6) in serum. Moreover, 7,8-DHF and its nanoparticles can effectively protect the ovarian reserve function of mice, maintain the normal estrus cycle and the homeostasis of serum estradiol (E2) and follicular estrogen (FSH). Thus, it is speculated that the intervention effect of 7,8-DHF and its nanoparticles on MetS in female mice might attributed to its Protective effect on the ovarian reserve function by alleviating the systemic inflammation mediated by gut microbiota.

Abstract:In order to improve the stability of camellia oil microcapsules, camellia oil microcapsules was prepared by using gelatin modified by nano-SiO2, corn syrup, sodium caseinate as wall and camellia oil as core material. The microencapsulation of camellia oil was prepared by spray drying method, and the effects of nano-SiO2 addition on microcapsules were studied by investigating the characteristics of physical and chemical properties, thermal stability, morphology and storage stability. The results showed that nano-SiO2 could enhance the stability of microcapsules. The addition of nano-SiO2 had no effect on water content and water absorption. At the same time, At the addition of nano SiO2 was 3% of the mass of gelatin, the comprehensive properties of camellia oil microcapsules were better than that of control samples. At this time, the particle size was 30.55 μm, the embedding rate was 92.58% and melting temperature was 171.05 ℃, which were increased by 3.16% and 15.13% compared with the control samples, respectively. The surface morphology of the microcapsules was full and dense without any cracks and the porous structure was weakened. The camellia oil microcapsules had good thermal and oxidative stability. The POV of camellia oil microcapsules were the lowest after 35 days storage under different conditions. POV was 15.98 mmol /kg in 50 ℃, which decreased by 13.14% compared with the microcapsules without nano-SiO2. The results of POV kinetic showed that the oxidation kinetics of camellia oil microcapsules was suitable for the first-order reaction.

Abstract:In order to study the influence of the carrier on the physical and chemical properties of pesticide solid nanoformulations and its selection principles, the emamectin benzoate solid nanodispersions with seven different carries were prepared by self-emulsifying and solidification technology. The powder size, solubility, specific surface area and morphology of the carriers were compared. Furthermore, the effects of the carriers on the particle size, dispersibility, interfacial charge, pH, crystallinity and foliar wettability of the solid nanodispersions were revealed.The physicochemical properties and structures of the carriers have a significant impact on the particle size, dispersibility, interfacial property and crystallinity of the solid nanodispersion.Sodium benzoate and sodium butyrate were excellent carriers for emamectin benzoate solid nanodispersions. The particle sizes of the solid nanodispersions with sodium benzoate as carriers was 22 nm and the PDI was 0.358.

Abstract:In order to solve the problems of high production cost and short catalytic cycling life of commercial Pt/C electrodes in the field of hydrogen evolution reaction （HER）, phosphotungstic acid was used to provide tungsten source, while the single-layer graphene oxide （GO） was used as a carrier and carbon nanotubes （CNTs） with favorable electron transport orbits was adulterated. WO3 crystals was prepared by one-step hydrothermal method and calcination in air. After that, WO3-rGO-CNTs nanoheterostructure was successfully synthesized. The chemical structure and physical morphology of WO3-rGO-CNTs were characterized by FT-IR, XRD, XPS, TG, SEM, EDAX, TEM and BET. The results show that WO3 crystals is uniformly grown on the surface of the single layer of GO with CNTs, the WO3-rGO-CNTs exhibits excellent HER electrocatalytic activities in an acidic electrolyte. Linear Sweep Voltammetry （LSV） and Cyclic Voltammetry （CV） measurements were performed for HER testing with WO3-rGO-CNTs nanoheterostructure. When the current density is 10 mA/cm2, the overpotential is 218 mV and the Tafel slope is 130.5 mV /dec. When the overpotential is -0.5 V vs. RHE, the impedance value is 8.2 Ω. At the same time, WO3-rGO-CNTs nanoheterostructure can maintain long-term stability and durability for up to 50 h under the overpotential of 218 mV （current density is 10 mA/cm2）, while its double-layer capacitance value is 1.2 mF/cm2. All of the electrochemical data show that WO3 crystals and GO with CNTs have synergistic effect due to the existence of heterogeneous structure: GO provides a wide range of metal reaction active sites for WO3 crystals, while CNTs provides active orbitals that are conducive to electron transport.

Abstract:In order to design anode materials for sodium ion batteries with high capacity and cyclic stability, ordered flower-like SnSe was synthesized in this paper. The ordered flower-like SnSe0.5S0.5@N-C composite material was obtained by nitrogen and carbon doping on its surface and further vulcanization. The ordered flower-like SnSe0.5S0.5@N-C composite material was used as the anode of sodium ion batteries for performance testing, the structure and morphology of the composites were characterized by SEM, TEM, XRD and XPS. The results show that SnSe0.5S0.5@N-C exhibits high reversible capacity and excellent cycling performance, when used as the negative electrode of sodium ion battery. The initial discharge capacity of the composite is 746 mA·h/g at the current density of 0.2 A/g, and the reversible specific capacity is still up to 430.7 mA·h/g after 100 cycles.

Abstract:N,N'-2-(4,6-dichloro-1,3,5-triazine-2-amino)-dimethylpropylamine(TAMP) was synthesized by cyanuric chloride and 3-dimethylaminopropylamine in the medium of acetone and water, and was characterized by FT-IR and 1H-NMR. Taking the delimed and softened sheepskin as the tanning experimental material, and taking the shrinkage temperature and physical sense of tanned leather as an inspection index. The suitable tanning conditions were determined by single factor experiment: dosoage of TAMP 20% (based on the mass of limed skin), the tanning process adopts step temperature control mode of 25℃, 35℃ and 45℃, and the tanning time of each temperature stage is 1h, 1.5h and 3 h in turn; In the dyeing experiment of tanned leather, the influence of TAMP tanned leather on the absorption and binding properties of dyes was evaluated by the aid of dye uptake and fastness to wet and dry rubbing. The results indicated that the shrinkage temperature of TAMP primary tanned leather could reach 71.6℃, and the grain surface is white and delicate; The tear strength was 34.00N/mm2,the tensile strength was 71.33N/mm, the dye uptake was 96.8%, and the color fastness to dry/wet rubbing was 2.0-4.0. The physical properties of TAMP primary tanned leather are higher than those of F-90 tanned leather. This experimental study provides a novel technical idea and way for the development and application of chrome-free tanning agents.

Abstract:A novel phosphaphenanthrene derivative, MAH-DOPS was synthesized with DOPS and maleic anhydride (MAH), and it was added into polylactic acid(PLA) to form a series of PLA/MAH-DOPS composites by melt blending. The structure of MAH-DOPS was characterized by Fourier infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) and high resolution mass spectrometry (HR MS). The thermal stabilities, flame-retardant, mechanical properties and thermal degradation behaviour of MAH-DOPS on PLA are investigated by TG, LOI, UL-94, CONE, TG-FTIR and SEM-EDS. The results show that the P and S elements in the flame retardant MAH-DOPS exert a synergistic flame retardant effect, increasing the flame retardant efficiency and improving the flame retardant properties of PLA. At flame-retardant content of 5 wt% (P 0.47%)，the initial decomposition temperature(T5%) of PLA/MAH-DOPS is 315.4℃, which is lower than that of PLA(332.5℃）, the char residue is increased，the LOI value of PLA/MAH-DOPS is 28.6% , the vertical combustion grade is UL-94 V-0, both of THR and Av-EHC of PLA/MAH-DOPS were decreased.The?mechanical?properties results show that compared with pure PLA, the bending strength of PLA/MAH-DOPS increases by 2.66%, while the tensile strength and notch impact strength decreases slightly. MAH-DOPS exert a flame retardant effect in the gas phase and condensed phase by flame suppression and carbon formation respectively, and the gas phase flame retardant mechanism mainly.

Abstract:A anionic polyurethane dispersions were prepared from isophorone diisocyanate (IPDI), polyethylene glycol 200, 400, 600, 800 (PEG), dimethylpropyl acid (DMPA), 1-phenyl-1,2-glycol, neutralizer (TEA), methylketoxime and so on. The structure and properties of the dispersant were characterized by FTIR、GPC and TG. The liquid indigo dispersion was prepared by grinding method with the self-made dispersant. The influence of the chain length and amount of the dispersant on the performance of the dispersion was discussed. After grinding for 1h, when the amount of polyurethane dispersant synthesized with polyethylene glycol 400 as the soft segment was 60% of the amount of dye, the particle size of liquid indigo prepared was 277.1 nm, the centrifugal stability at 1000 r/min was 94%, and the centrifugal stability at 3000 r/min was 51%. After being placed at room temperature for 7 days, the particle size changed within 20 nm, and the K/S of the dyed fabric was about 10, which was twice that of powdered indigo, The color properties of the dyed fabric did not change. SEM showed that the particle size distribution of the dispersion was uniform. There was little difference in the stability of the dispersion system compared with the formaldehyde condensate (MF) of sodium methylnaphthalene sulfonate and lignin 85A.

Abstract:Emulsification and viscosity increase often occur during fracturing production of jimusar crude oil, which affects the normal production of crude oil. In order to clarify the cause of crude oil emulsification, the effects of crude oil composition, fracturing fluid composition and pH on emulsion stability and interface properties were studied; Petroleum acid was obtained by alcohol alkali extraction. The distribution and composition of petroleum acid were analyzed by high resolution mass spectrometry. The results show that guanidine gum fracturing fluid system is more emulsified than polymer fracturing fluid system. The main reasons for the emulsification of jimusar crude oil are as follows: first, there are many interfacial active substances such as naphthenic acid, aromatic acid and fatty acid in the crude oil; Second, the alkali and weakly alkaline formation water in the fracturing fluid components interact with the acidic substances in the crude oil for a long time to form soaps with strong interfacial activity; Third, strong stirring in the production process to promote crude oil emulsification. In order to solve the problem of emulsification and viscosity increasing, after adding 0.5% JN-1 viscosity reducing and drag reducing agent to the mixture of crude oil and fracturing fluid, the viscosity of the mixture decreases from 2232 mPa·s to 155 mPa·s at 30 ℃, which can effectively reduce the viscosity of the mixture. In view of the emulsification problem of jimusar shale oil, it is suggested to adopt alkali free sliding water system for fracturing development, and add viscosity reducer to the fracturing fluid, which is one of the effective methods to solve the emulsification and viscosity increase of jimusar crude oil after fracturing.

Abstract:In order to solve the problem that conventional polymers cannot meet the technical requirements of acid fracturing in ultra-high temperature and deep wells, two polymers SY-1 and SY-2 were prepared by free radical polymerization using acrylamide(AM) 2-trimethylammonium ethyl methacrylate chloride (DMC)and AM DMC SMA ( octadecyl methacrylate ) as raw materials, and their structures were characterized and their properties were tested. The results showed that 720 cm-1in SY-2 infrared spectrum was the bending vibration absorption peak of—(CH2)n—, and the monomer was successfully grafted onto the polyacrylamide molecular chain. Thermogravimetric analysis showed that the weight loss ratio of SY-1 to 600?Cwas 98%, and that of SY-2 was 86%, and the thermal stability was improved. In 20% hydrochloric acid, the mass fraction of SY-2 is 0.8%: 180?C, 170s-1 rheological properties test, SY-2 shear end viscosity 56mPa?s, 90?C, 120?C, 150?C shear 1h, viscosity 83.6mPa?s, 43.5mPa?s, 27.8mPa?s, shear stability were 85.66%, 74.45%, 52.01%. At 180?C and 3 MPa, the static acid-rock reaction rate is 8.94 ? 10-5 (g/cm2 ? s), which is one order of magnitude lower than the conventional SY-1 reaction rate of 1.69 ? 10-4 (g/cm2 ? s). It has good compatibility with corrosion inhibitor and iron ion stabilizer to overcome the application bottleneck of high temperature acid fracturing technology.

Abstract:Hydroxyl groups in (4S)-3-[(5S)-5-(4-fluorophenyl)-5-hydroxypentanoyl]-4-phenyl-1,3-oxazolidin-2-one (Ⅱ) and 4-{[(4-fluorophenyl)imino]methyl}phenol (Ⅲ) were protected by chlorotrimethylsilane and N,O-bis(trimethylsilyl)acetamide, respectively. Then key intermediate of ezetimibe, (S)-3-{(2R,5S)-5-(4-fluorophenyl)-2-((S)-[(4-fluorophenyl)amino]{4-[(trimethylsilyl)oxy]phenyl}methyl)-5-[(trimethylsilyl)oxy]pentanoyl}-4-phenyloxazolidin-2-one (Ⅰ) was obtained by Mannich-like reaction with TiCl4 as catalyst and dichloromethane as solvent. The structure of product was characterized by 1HNMR, 13CNMR, MS, FTIR and polarimeter. The effects of molar ratio of reactants and reaction temperature on the yield of product Ⅰ were investigated by single factor method. The optimum conditions were obtained as follows：n(Ⅱ)∶n(Ⅲ)∶n(TiCl4)=1.0∶1.5∶1.2, reaction time of 4.0 h, reaction temperature between -30 and -25 ℃. Under the above conditions, product Ⅰ had a yield of 63.17% and purity of 97.28%. The purity of Ⅰ could be improved to 98.96% after the refining.