Abstract:Lithium-rich manganese-based cathode materials (xLi2MnO3·(1-x)LiTMO2,0

Abstract:Porphyrinoid-based metal organic framework (MOF) is featured with a crystal structure formed by the coordinating self-assembly between metal or metal clusters and porphyrin ligand or porphyrinoid family compounds. It combines the good photophysical properties and biocompatibility of porphyrinoid molecules, bearing a periodic and controllable structure, which can be potentially used in the field of photochemistry and biological medicine. In particular, the excellent performance of porphyrinoid molecules in the porphyrinoid MOFs can be remained which can thus play a role in killing harmful cells in human bodies via the photo-assisted medical treatment including photokinetic and photothermal therapies. In this paper, we reviewed the recent development of porphyrinoid-based MOFs and their applications in the biomedical field including anti-tumor and anti-bacterial treatments. We mainly focused on the performance improvement of porphyrinoid-based MOF type photosensitizers, compared to that of porphyrinoid molecules, and the diverse functions derived from the different type of porphyrinoid MOFs. The development potentials of porphyrinoid MOFs were also proposed.

Abstract:Microencapsulated phase change materials (MEPCMs) that encapsulate phase change materials in shell, effectively alleviating the leakage problem, have been widely applied in thermal storage field with great performance. However, the existence of shell hinders thermal conduction between phase change materials and outer space, inducing low thermal conductivity of MEPCMs that constrains their practical uses. Hence, modification of MEPCMs as a widely adopted way can effectively enhance the thermal conductivity of MEPCMs. In this review, components and structure of MEPCMs are first introduced, and microscopic thermal conduction mechanisms from phonon-phonon and electron-phonon interaction perspective are elaborated. Then, recent advances in thermal conductivity enhancement by modifying the shell and core materials is respectively summarized and analyzed by quantitative experimental results and microcosmic mechanism. In addition, the application of modified phase change microcapsules in textile temperature control, slurry and construction is summerized. Finally, the main outlooks and challenges of modified MEPCMs and applications are outlined.

Abstract:CCUS is an important way for green development of the energy industry. Compared with traditional processes such as chemical absorption, pressure swing adsorption, and cryogenic distillation, membrane separation method has the advantages of low energy consumption, high efficiency, miniaturization, environmental-friendly and easy integration with other technologies. At present, the selection and modification of membrane materials and the reconstruction of membrane structure are the keys to improving the separation performance. This paper summarizes and compares the research progress of organic polymer membranes, inorganic membranes and mixed matrix membranes, and reviews their separation mechanism, separation performance, modification research and filling materials used to prepare mixed matrix membranes. The research direction of improving the performance of CO₂ separation membrane materials and the challenges faced by membrane separation technology are further prospected.

Abstract:Although SiO anode has high specific capacity and reasonable working voltage, it still faces the common problems of silicon-based anode materials such as low initial Coulomb efficiency, large volume expansion (~160%) and poor conductivity, which seriously hinders its large-scale commercial application in lithium-ion battery (LIBs). Among many metal oxides, titanium oxides anods have been reported many times in recent years to improve the electrochemical performance of SiO due to its small volume change during charge and discharge and excellent lithium storage capacity and thermal stability after lithiation. Above all, based on the microstructure and lithiation mechanism of SiO, this paper briefly summarizes the cases of composite modification of SiO and many metal oxides,; Secondly, it focuses on the research work of titanium oxides modify SiO anode, stressing the induction and analysis of TiO2 and TiO2-x modified SiO anode, and summarizes the mechanism of titanium oxides improving the electrochemical performance of SiO and the structure-activity relationship between modification process and electrochemical performance. In the end, the realization of the goal of commercialization of SiO-based anode with high energy density is prospected: making full use of relevant software algorithms to simulate the system with the lowest chemical complexity, which is conducive to in-depth analysis of the reaction process and electrochemical mechanism; strengthening the modification of SiO anode by new low-cost titanium oxides (such as Ti2O3) is beneficial to promote the academic research and commercial application of SiO-based anode.

Abstract:Bisphenol A based polycarbonate (BPA-PC) by petroleum as raw materials is limited in the application of food packaging and other fields due to the non-renewable and estrogenic effects of bisphenol A. In recent years, Isosorbide (IS), as a bio-based renewable monomer that is non-toxic and harmless, is currently the most promising key raw material for replacing bisphenol A in the synthesis of polycarbonates. And the isosorbide based polycarbonate (IS-PC) has non-toxicity, excellent optical properties, scratch resistance, thermal stability, biodegradability and biocompatibility, which has shown good application prospects in packaging, automobiles, electronics, biomedicine and other fields. This article reviews the preparation methods and performance regulation of IS-PC, focusing on the preparation of IS-PC by melt transesterificationthe, summarizing the methods of regulating the performance of isosorbide polycarbonate ( IS-PC ) and prospects for the research direction of IS-PC.

Abstract:Carbon dioxide (CO2) is a major greenhouse gas, but also a cheap, non-toxic and renewable C1 resource. It is anticipated that the conversion of CO2 into valuable fine chemicals is able to mitigate the climate change and facilitate carbon neutrality. The cycloaddition reaction of epoxide with CO2 has the advantages of high atom economy, high selectivity and low pollution. The product cyclic carbonate can be used as electrolyte for lithium-ion battery, precursor of polymer materials and intermediate of fine chemicals. The oxides have been considered a promising catalyst for cycloaddition reaction because of their diverse structures and controllable acid-base properties. This article reviews the research progress of two typical, low-cost and easily large-scale oxides: metal oxides and zeolite in catalyzing the cycloaddition reaction between CO2 and epoxides, and focuses on the analysis of the reaction mechanism and the application of catalysts. The key points of the future work will be aimed at the development of true inhomogeneous catalysts without additives and a clear mechanism of the reaction.

Abstract:The silicon dioxide (SiO₂) antireflective coatings which were fabricated by traditional sol-gel method performed excellent antireflective property due to their low refractive index. However, their adhesion was very poor which strictly restricted their application fields. In this paper, organic-bridged polysilsesquioxane EG-BPSQ was introduced into SiO₂ sol to enhance the adhesion between SiO₂ nanoparticles as well as between coating and substrate. By post-treatment of different temperature, a series of antifogging and antireflective coatings with enhanced adhesion were obtained. Furtherly, the effects of EG-BPSQ addition on the microstructure, optical property and adhesion of composite coatings and different post-treatment temperature on the optical property and antifogging property were both investigated. The experimental results showed that EG-BPSQ plays the dual roles of bonding and pore-forming. When the post-treatment temperature was 150℃, the composite coatings not only performed good antireflective property with the transmittance as high as 98.5% which was approximately 8% enhancement compared to that of blank substrate, but also exhibited antifogging property. Besides, all the composite coatings adhesion level was 0 grade.

Abstract:A multifunctional eutectogel (DES-AL-CNC) was prepared using alkali lignin (AL) and cellulose nanocrystals (CNC) as raw materials and deep eutectic solvent (DES) as solvent. The DES-AL-CNC eutectogels were characterized using infrared spectroscopy, scanning electron microscopy, and mass spectrometer. The results showed that the addition of AL resulted in excellent mechanical properties, adhesion and UV resistance of the eutectogel. When the addition of AL was 0.3%, the eutectogel reached the maximum strain at break and tensile strength of 852% and 542 kPa, respectively; it could easily adhere to various substrate surfaces, including the adhesion strength to glass up to 32 kPa; and UV resistance up to 100%. Due to the presence of DES, the eutectogel has excellent resistance to drying, with a mass reduction of less than 10% at 65 °C for 7 days. In addition, the eutectogel can be assembled into flexible strain sensors, broadening the application of flexible wearable electronic devices.

Abstract:In order to solve the problems of high entanglement and difficult processing of ultra-high molecular weight polyethylene (UHMWPE) prepared by traditional Ziegler Natta catalyst (Z-N catalyst), a magnesium dichloride supported Z-N catalyst cat1 (or cat2) was prepared by chemical reaction method using MgCl2, TiCl4, isooctanol, tetraethyl orthosilicate (or dihexyl phthalate) as the main raw materials.Low entanglement UHMWPE was prepared by slurry polymerization using cat1 and cat2 as the main catalysts and triethylaluminum as the co catalyst. The particle size distribution and metal element content of cat1 and cat2 were measured, and the effects of polymerization temperature and time on the catalytic activity of the catalyst and the viscosity relative molecular weight (Mv) of UHMWPE were investigated.The degree of entanglement of UHMWPE were characterized by rheological analysis and DSC thermodynamic annealing.The results showed that the prepared cat1 and cat2 were consistent with the initial design. Under the optimized slurry polymerization process, when the polymerization reaction temperature was 65 °C and 70 °C, the catalytic activity of cat1 and cat2 reached 27700 and 37700 g PE/g cat respectively. The Mv of the prepared UHMWPE was 6.01 × 106 and 5.03 × 106, and the initial storage modulus was 0.21 and 0.13 MPa respectively. The entanglement degree was lower than that of commercial UHMWPE.

Abstract:LiZn_0.05Al_0.03Mn_1.92O₄ cathode material was synthesized by a solid-state combustion method and calcination temperature at 600、650、700 and 750 ℃. The experimental results show that Zn-Al co-doping and the calcination do not change the spinel structure of LiMn₂O₄. The crystallinity of the samples aggrandizes along with the increase of the calcination temperature. More truncated octahedral grains containing high exposure {111}, small area {110} and {100} crystal face are formed at 650 ℃ and higher temperature. However, some samples decompose at 750 ℃. At 5 C and 10 C, the initial specific discharge capacities and the capacity retention ratio after 1000 cycles are 101.3 mAh/g、81.5% and 99.9 mAh/g、74.3%, respectively. CV and EIS show that it has great cyclic reversibility and large Li₊ ^{diffusion coefficient. The Zn-Al} co-doping and morphology control modified LiMn₂O₄ cathode material can effectively inhibit the Jahn-Teller effect of spinel LiMn₂O₄ material. The truncated octahedral morphology reduces the dissolution of Mn and provides more Li^₊ diffusion channels. It improves the rate capacity and cycle life of the material.

Abstract:Tungsten-doped vanadium dioxide@poly(dopamine) modified polyurethane solid-solid phase change material (W-VO2@PDA/PUPCM) was prepared by in situ polymerization using polyethylene glycol (PEG) as the soft segment, isophorone diisocyanate (IPDI) as the hard segment and polydopamine-coated tungsten-doped vanadium dioxide (W-VO2@PDA) as the filler. The effect of PEG molecular weight on the stability of W-VO2@PDA/PUPCM emulsions and the temperature regulation of the finishing fabrics was investigated. The chemical structure, crystallization properties, phase change properties and thermal stability of W-VO2@PDA/PUPCM were tested and characterized by FT-IR, POM, DSC and TGA. The results showed that the molecular weight of PEG had a great influence on the thermal storage and phase change properties of W-VO2@PDA/PUPCM. When the molecular weight of PEG was 8000, W-VO2@PDA/PUPCM had good shape stability and thermal stability, and the highest melting temperature(51.52 ℃) and phase change enthalpy(144.82 J/g). The maximum temperature difference between the W-VO2@PDA/PUPCM finished fabric and unfinished fabric was 7.8 ℃ and 5.3 ℃ during the heating and cooling process. W-VO2@PDA/PUPCM finished fabric has a wide range of application prospects in the field of intelligent temperature control fabrics.

Abstract:In order to improve the foam performance under harsh conditions of high-temperature and high-salt oil reservoirs, the synergistic effect of the binary system of dodecyl diphenyl ether disulfonate (DDBS) and cocoamidopropylamine oxide (CAO) was studied. The critical micelle concentration (CMC), surface tension and foam performance were tested. The results showed that the interaction parameters of the two substances in the monolayer adsorption at the interface and micelles were between -3 and -7, showing a moderate degree of synergism. Compared with the single surfactant, the binary system significantly reduced the CMC and surface tension, and increased the saturation adsorption capacity, thus improving the foam performance significantly. When the optimal molar ratio n(DDBS):n(CAO)=6:4 was selected, naming SHY-1, which had a wide salinity adaptation range. It exhibited good foam performance at a salinity of 0-158308 mg/L and calcium and magnesium ions of 0-10000 mg/L. The foam was generated in situ in porous media at 105℃, with a apparent viscosity of 180 mPa?s, effectively sealing the channeling. DDBS/CAO surfactants can enhance the foam properties, which brings broad prospects for the application of foam in high-temperature and high-salt reservoirs.

Abstract:Efficient, clean and non-toxic and non-hazardous catalysts are the focus to realize the decomposition of formic acid (HCOOH) as chemical hydrogen storage material for hydrogen production. In this paper, TiO₂ carriers were prepared by hydrothermal method at 453 K, and then NiCl₂.6H₂O and K₂PdCl₄ metal solutions with a total amount of 0.1 mmol were added to them by impregnation method to synthesize NiPd/TiO₂ catalysts by loading the active components Ni and Pd onto TiO₂ carriers, and to investigate their effects on the performance of catalytic formic acid decomposition for hydrogen production. The results of the investigation showed that the reaction conversion frequency (TOF) value of the NiPd/TiO₂ catalyst was the largest when the metal Ni:Pd ratio was 2:8 under the catalysis of light, at which the TOF of the catalyst was 3528 h_-1^{, and the activation energy (}E_a) of formic acid decomposition on this catalyst was 53.9 kJ/mol.

Abstract:A series of quaternary ammonium zirconium salt co doped phosphotungstic acid catalysts were prepared by ion exchange method. The structure, stability and acidity of the composite catalysts were characterized by SEM, FT-IR, XRD, XPS, TGA-DTG, and n-butylamine potential method. And its catalytic performance during acetalization of benzaldehyde (BH) and glycol (GL) were assessed. Meanwhile, the effects of catalyst amount, the molar ratio of alcohol to aldehyde, the amount of water carrying agent and the reaction time on the yield of benzaldehyde glycol acetal (BEGA) were examined. The results showed that the TB_0.5Zr_0.5H_0.5PW (TB was tetrabutylammonium bromide) catalyst had excellent catalytic activity. The strong Bronsted acidity, synergistic effect between Bronsted and Lewis acid centers, and "pseudo liquid phase" characteristics were the reasons for the high activity of the catalyst. Using TB_0.5Zr_0.5H_0.5PW as the catalyst, the yield of BEGA can reach 94.6% under the conditions optimized via response surface methodology (RSM) with BH/GL molar ratio of 1.5:1, catalyst amount of 1.9% of BH, reaction time of 3 h, and amount of cyclohexane 12.6 mL. The TB_0.5Zr_0.5H_0.5PW solid acid catalyst still exhibited excellent catalytic performance after 6 further uses, indicating that the catalyst had promising industrial application possibilities.

Abstract:ε-caprolactone(ε-CL), polyethylene glycol methyl ether methacrylate (PEGMA), and 4-cyano-4-(dodecylsulfanylthiocarbonyl)sulfanylpentanoic acid (CDPA) were respectively considered to be hydrophobic chain segment, hydrophilic chain segment, and initiator in the polymerization reaction. A bi-block polymer PEGMA-b-PCL was prepared by reversible addition-fragmentation chain transfer(RAFT)polymerization and the polymer were self-assembled into polymeric micelle as nanocarriers. The results showed that the relative molecular weight of the polymer was in the range of 478-7318, and the size distribution of the micelles was 68.34-186.30 nm. The polymeric micelle critical micelle concentration (CMC) (pH=7.4, 0.920 μg/mL~1.600 μg/m L) is lower. When n (CDPA): n(ε-CL) = 1: 200, the drug loading capacity and encapsulation efficiency of drug curcumin(Cur)loaded micelles are the as high as 12.05% and 75.26%, respectively. Under different conditions, the drug sustained release behaviour can be carried?out within 15 days, and the cumulative release amount of the drug can reach as high as 35.38% in the aqueous solution (pH=5.0).

Abstract:In order to improve the extraction rate of flavonoids from Hibiseu manihot L flower and explore its application in cosmetics, Hibiseu manihot L flower was used as raw material, ultrasonic-assisted extraction was used to extract flavonoids from Hibiseu manihot L flower. The extraction process was optimized by a single factor experiment and an orthogonal experiment, and the antioxidant activity and safety of flavonoids extracted from Hibiseu manihot L flower under the optimal process conditions were evaluated. The results showed that the optimum extraction process of flavonoids from Hibiseu manihot L flower was as follows: ultrasonic power 300 W, ethanol volume fraction 80%, ultrasonic time 35 min, extraction temperature 75 °C, solid-liquid ratio (g ∶ mL) 1:15. The maximum extraction rate of flavonoids from Hibiseu manihot L flower was 89.97%. 1 g/L flavonoids from Hibiseu manihot L flower had the highest scavenging rates of DPPH free radical and hydroxyl radical, which were 94.81% and 95.24%, respectively. The half maximal inhibitory concentration (IC50) values were 0.1060 and 0.07006 g/L, respectively. The flavonoids from Hibiseu manihot L flower with a mass fraction of 3.13% had the largest radical scavenging rate (85.61% ) on ABTS cation-free radical. When the concentration of flavonoids from Hibiseu manihot L flower was less than 0.4 mg/mL, the hemolysis rate of red blood cells was less than 10%, which belonged to the mild stimulation rating. Flavonoids from the Hibiseu manihot L flower at a concentration of 1 mg/mL had no hemolysis on the chick embryo chorioallantoic membrane.

Abstract:The solvent-assisted flavor evaporation extraction and gas chromatography-mass spectrometry/olfactory was used in this work. The content differences (mg/kg) were analyzed by principal component analysis. A total of 192 volatile aroma-active components among 18 types of strong fragrance spices were detected. Among them, the highest number of olefin compounds was 46, followed by 39 alcohols, 29 esters, 23 ketones, 20 aldehydes, while other types lower than 20. According to the types and contents of aroma-compounds among different spices and principal component analysis, four categories were divided: (1) cis-Anethol was the main aroma-active compounds in tarragon, fennel, star anise, and dill. (2) trans-Cinnamaldehyde and 1,8-cineole were the main aroma-active compounds in Indonesia cassia. (3) 4-Allyl phenylacetate and eugenol were the main aroma-active compounds in clove. 1,8-Cineole, cinnamon acetate, borneol, trans-cinnamaldehyde, L-carvone, safrole, ethyl 3-methylbenzoate were the main aroma-active compounds in small cardamon, vietnamese cassia, thyme, Chinese cassia, caraway, nutmeg, and celery, respectively. (4) Linalool and geraniol were the main aroma-active compounds in coriander. Linalool and 4-allylanisole were the main aroma-active compounds in sweet basil. Linalyl acetate, myristicin, and methyl eugenol were the main aroma-active compounds in oregano, pimento allspice, and greater Indian cardamom, respectively.

Abstract:The aim of this study was to prepare and characterize zein and flavonoids of Houttuynia cordata (HCF) composite nanoparticles (NZH) and investigate the effects of different mass ratios of zein and HCF on the composite nanoparticles. The results showed that hydrogen bonding, hydrophobic and electrostatic interactions existed between HCF and zein, the melting temperature of NZH increased, and the thermal stability improved after the addition of HCF. With the increase of HCF, the average particle size and PDI of NZH first decreased and then increased, and the absolute value of zeta potential and encapsulation first increased and then decreased. Among them, NZH-3 (zein:HCF was 20:3) was homogeneous and well dispersed round spherical shape, the average particle size, the smallest PDI value, the narrowest particle size distribution peak, and the absolute value of zeta potential was the largest. In addition, the addition of HCF made the composite nanoparticles have higher DPPH. and ABTS scavenging ability. Compared with free HCF, NZH-3 had better heat treatment protection ability and improved the heating stability of HCF During the simulated gastrointestinal digestion, the HCF release rate of NZH-3 was only 22.31% after 120 min of digestion by SGF, and the sudden release phenomenon occurred in SIF digestion, and the HCF release rate reached 75.66% at 240 min of digestion by gastrointestinal fluid. NZH-3 release trends in the simulated gastrointestinal fluid were all consistent with the Ritger-Peppas model, but the release mechanisms were different, with a non-Fick diffusion mechanism in SGF and a Fick diffusion mechanism in SIF.

Abstract:A precursor FeVO4·1.1H2O nanorod was obtained through the ionothermal synthesis method with the ionic liquid bromide-1-butyl-3-methylimidazolate [Bmim]Br as the reaction solvent, and then the FeVO4 nano-microsphere was successfully synthesized by calcination and post-treatment of the precursor FeVO4·1.1H2O, which was used as the cathode material for the lithium ion battery. Structure and morphology properties of samples prepared were characterized through XRD, XPS and BET methods. The FeVO4 electrode showed an initial discharge capacity of 1471.58 mAh g-1 at 100 mA g-1, and maintained the specific capacity of 783 mAh g-1 after 100 cycles at 300 mA g-1. Besides the nanoscale size of the electrodes, the improved rate performance is mainly attributed to the unique spherical state.

Abstract:Treatment of industrial dye wastewater with high chromaticity and high toxicity by modified graphene oxide membrane. The graphene oxide (GO) was crosslinked using thiourea (TU). TU-GO nanosheets with m(TU):m(GO)=0.5, reaction temperature 80 °C, reaction time 1h were deposited on polyether sulfone microfiltration membrane (0.22 μm). When the loading capacity was 238.73 mg/m2, the polyether sulfone microfiltration membrane was deposited. The retention rates of methyl orange, Rhodamine B and methylene blue were 94.01%, 87.07% and 99.67%. In order to optimize the separation effect of Rhodamine B, the modified graphene oxide film was prepared by using thiourea (TU) and choline chloride (ChCl) as a eutectic solvent :m(TU):m(ChCl)=2:1, and the modification time was 1 h. The modified graphene oxide film did not affect the original high retention rates of methyl orange and methylene blue, which were 93.95% and 99.24%, respectively. The retention rate of P-Rhodamine B was increased to 99.16%. The reduction mechanism and stability enhancement mechanism of GO during thiourea crosslinking were also analyzed.

Abstract:In order to improve the antifouling performance of Polyethersulfone (PES) membrane, SMANa/PES membranes were prepared by non-solvent induced phase separation (NIPS) method with the styrene maleic anhydride copolymer (SMANa) as additives. Afterwards, Polypyrrole (PPy) conductive layer was fabricated on SMANa/PES membranes by in situ chemical polymerization from the vapor phase with FeCl3 as the oxidant. A series of PPy/SMANa/PES conductive composite membranes were prepared by systemically investigated the oxidant concentration, time and temperature of polymerization on the performance of the membrane. The PPy/SMANa/PES conductive composite membranes obtained were characterized by FTIR, SEM and contact angle tester for structure and morphology analyses, and evaluated for water flux and antifouling performance in ultrafiltration. The results showed that, under the temperature of 30 ℃, with the concentration of FeCl3 is 0.8 mol/L, and time of polymerization is 5min, the resulting membrane had an outstanding water flux of 409 L/(m2·h) with pressure of 0.1 MPa, which is 83.75% percent of SMANa/PES membranes. After ultrasonic?irrigation, the flux recovery ratio (FRR) of the resulting membrane reach up to 86.57%, improved by 16.57% compared with SMANa/PES membranes.

Abstract:Based on the reactivity ratio of comonomers obtained from the experiment, the supplemental time and amount of acrylic acid (AA) were determined by controlling the conversion ratio and adding active monomer according to theoretical calculation and experimental determination, so that the monomer composition of AA and methyl allyl polyethylene glycol (MAPEG) remained unchanged in the copolymerization system, so as to ensure the consistency of the copolymer composition generated successively. In order to systematically study the accuracy and reliability of the controlled feeding process (CFP), the composition difference of the copolymers obtained in CFP and traditional feeding processes (TFP) was compared. The effect of controlling copolymer composition on dispersion performance was investigated. The results show that the average acid/ether ratio [n(AA)/n(MAPEG)] of polycarboxylate superplasticizer (PCE) copolymers prepared by CFP based on the reactivity are 2.79, 3.77, 4.82, respectively, which are basically consistent with the designed goal (3.0, 4.0, 5.0). PCE prepared by CFP have higher average main chain length, carboxyl molar fraction and macromonomer molar fraction, which increases the coverage area and adsorption layer thickness of PCE, thus improving the initial fluidity and fluidity retaining ability when used in cement paste.