Table of Content

10 December 2023, Volume 44 Issue 12

Previous Issue   

Contents

Cover and Content of Chemical Journal of Chinese Universities Vol.44 No.12(2023)

2023, 44(12):  1-6. 

Asbtract ( )   PDF (29383KB) ( )  

Related Articles | Metrics

Volume Contents of Chemical Journal of Chinese Universities to Vol.44(2023)

2023, 44(12):  1-10. 

Asbtract ( )   PDF (839KB) ( )  

Related Articles | Metrics

Article: Inorganic Chemistry

Application of Covalent Organic Framework-Polyoxometalates Composites in Heterogeneous Catalytic Epoxidation of Olefins

KONG Xiangyu, LIAO Li, LU Canzhong, FANG Qianrong

2023, 44(12):  20230282.  doi:10.7503/cjcu20230282

Asbtract ( )   HTML ( )   PDF (3379KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Covalent organic frameworks are crystalline porous materials with great application potential in heterogeneous catalysis. We synthesized a new functional covalent organic framework， COF-FL-2， using derivatives of electron-deficient naphthalene diimide（NDI） as monomers. COF-FL-2 has a large pore size and good adsorption performance. The NDI structure on the skeleton can form a stable functional composite with polyoxometalates through π-anion interaction. A novel hybrid heteropolyacid complex， PTA@COF-FL-2， was prepared by loading phosphotungstic acid（PTA） on COF-FL-2. Remarkably， PTA@COF-FL-2 shows high catalytic activity for the epoxidation of olefins with t-BuOOH as the oxidant， and can epoxidate cyclooctene and 1-octene into the corresponding epoxides under mild conditions. PTA@COF-FL-2 can be used for a long time under reaction conditions， and there is no PTA leaching phenomenon when used. In addition， PTA@COF-FL-2 is very convenient to recycle and can be recycled many times.



Analytical Chemistry

Electrochemical Sensor for Ammonium Nitrogen in Soil Based on Platinum Modified Screen-printed Electrodes

CHEN Shan, CHEN Jinhu, XU Guohailin, LIU Jun, Qian Mingyan, CHEN Jingwen, FANG Yimin

2023, 44(12):  20230390.  doi:10.7503/cjcu20230390

Asbtract ( )   HTML ( )   PDF (2769KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

Rapid detection of ammonium nitrogen（NH₄⁺） in soil is quit important for precise agriculture as it can significantly increase the utilization of soil fertility and reduce the environmental pollution. Compared with the traditional detection methods for NH₄⁺ which are time-consuming and expensive， here we developed a rapid and sensitive electrochemical sensor by platinum deposited screen printed electrodes（Pt-SPEs） as sensing components. Owing to the specific catalysis to NH₄⁺， using the carbonate to precipitate the metal ions， coupling with the ammonium extraction syringe， NH₄⁺ in soil can be detected in 5 min for the first time， with a detection range of 0.1—5 mmol/L（R²=0.997）and a detection limit of 13 μmol/L（S/N=3）. This sensors can be applied for on-site detection of NH₄⁺ in soil due to its rapidity， simplicity， high selectivity and stability without large equipment， providing an important data support for precise agriculture.



Visualization of Mitochondria via Carbazole Near-infrared Fluorescent Probe and in vivo Imaging Application

GU Yaqin, DING Jinfeng, CHEN Jine, XIE Wenna, XIAO Linxia

2023, 44(12):  20230367.  doi:10.7503/cjcu20230367

Asbtract ( )   HTML ( )   PDF (7050KB) ( )  

Figures and Tables | References | Related Articles | Metrics

A series of near-infrared fluorescence probes（6g—6j） with large Stokes shift was synthesized based on carbazole skeleton and characterized by high resolution mass spectrometry（HRMS） and nuclear magnetic resonance spectroscopy（NMRS）. The physicochemical and optical properties of the probe show that probe 6j has a wavelength of 668 nm in aqueous solution， a large Stokes shift（146 nm） and a high fluorescence quantum yield（Φ=0.45）. The probe 6j was applied to intracellular imaging， and showed an excellent mitochondrial targeting ability（P=0.90）. In addition， the probe can fluoresce image in transplanted ovarian cancer tissues of nude mice， providing a new strategy for accurate diagnosis of tumors in clinical practice.



Organic Chemistry

High-efficiency Near-infrared Thermally Activated Delayed Fluorescence Based on Tetracyano Acceptor

WANG Xiaojing, LIU Yixia, LI Yang, YANG Chenzong, FUNG Mankeung, FAN Jian

2023, 44(12):  20230274.  doi:10.7503/cjcu20230274

Asbtract ( )   HTML ( )   PDF (2629KB) ( )  

Figures and Tables | References | Related Articles | Metrics

The near-infrared thermally activated delayed fluorescence（TADF） material 11，12-bis［4-（diphenyla- min）phenyl］dipyrido［3，2-a：2'，3'-c］phenazine-3，6，10，13-tetracarbonitrile（FCNPZ-TPA） was designed and synthesized with dipyridinophenazine as the acceptor unit and triphenylamine（TPA） as the donor unit. The introduction of four cyano groups into the acceptor unit increased its electron-withdrawing strength. Considering that tripheny-lamine is a strong electron-donating group， we successfully pushed the emission of FCNPZ-TPA into Near Infra（NIR） region via the incorporation of strong donor and strong acceptor. The steric hindrance between donor（D） and acceptor（A） led to a twisted D-A molecular configuration of FCNPZ-TPA， and thus achieving a small singlet-triplet energy gap（ΔE_ST）. Due to the rigid molecular skeleton and small ΔE_ST， FCNPZ-TPA based organic light-emitting diode（OLED） exhibited a state-of-the-art maximum external quantum efficiency（EQE） of 8.01% at 742 nm when doped in the 4，4'-bis（N-carbazolyl）-1，1'-biphenyl.



Synthesis and Bioactivities of Penta-1，4-dien-3-one Derivatives Containing a Coumarin Moiety

WANG Xiaobin, WANG Ruiying, DONG Xue, YAN Lili, ZHANG Juan, GU Yifei, CHENG Qingfang, XUE Wei

2023, 44(12):  20230337.  doi:10.7503/cjcu20230337

Asbtract ( )   HTML ( )   PDF (2765KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

Aiming to develop novel candidates for antitumor drugs， sixteen monocarbonyl curcumin derivatives were constructed by dexterously intergrating a coumarin fragment into the penta-1，4-dien-3-one skeleton deriving from the structural optimization of a curcumin molecule. After structural confirmations， the above derivatives were tested by a methyl thiazolyl tetrazolium（MTT） colorimetric assay for their inhibitory activities against the in vitro proliferation of gastric cancer cells（SGC7901） and hepatoma carcinoma cells（HepG2）. The bioassay results demonstrated that most of synthesized molecules exhibited outstanding inhibitory effects against the in vitro proliferation of SGC7901 and HepG2 cells. Strikingly， the half maximal inhibitory concentrations（IC₅₀） of compounds 4c and 4j against SGC7901 cells reached 0.22 and 0.27 µmol/L， respectively， which are obviously better than that of epirubicin（1.23 µmol/L）. Meanwhile， the IC₅₀ value of compounds 4l against HepG2 cells reached 0.47 µmol/L that is observably superior to that of epirubicin（2.30 µmol/L）. Subsequently， morphological observations reconfirmed the outstanding advantage of coumarin-containing penta-1，4-dien-3-ones on inhibiting the in vitro proliferation of tumor cells， which implied these distinctive derivatives could be further developed as novel candidates for antitumor drugs.



Preparative Release and Mass Spectrometric Analysis of Tn and T Antigens Existing in Sericin

MAN Lijuan, YE Jiajia, ZHANG Defeng, ZOU Zihua, HUANG Linjuan, WANG Zhongfu, WANG Chengjian

2023, 44(12):  20230378.  doi:10.7503/cjcu20230378

Asbtract ( )   HTML ( )   PDF (1492KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Silkworm sericin-derived Tn and T antigens， a group of biomarkers of many cancers， were targeted in this study. The O-glycans of sericin were first released using the “one-pot” non-reductive release method， the ammonia-catalyzed non-reductive release strategy and the pronase E digestion approach. The samples were subsequently fractionated for purification using solid-phase extraction columns and separated for preparation via high-performance liquid chromatography（HPLC）. The generated glycan samples were finally analyzed in detail by means of electrospray ionization mass spectrometry（ESI-MS）， tandem mass spectrometry（MS/MS） and liquid chromatography coupling online with mass spectrometry（Online LC-MS）. The obtained results showed that the O-glycans of sericin just include O-GalNAc and O-GalNAcGal， the contents of which have been determined to be 1.58 μg/g and 0.54 μg/g， respectively. Their molar ratio in sericin is approximately 5.3∶1. The O-linked monosaccharide of sericin， GalNAc， allows efficient non-reductive release as a reducing form in ammonium hydroxide and fine separation by liquid chromatography. Tn and T antigens can be efficiently generated from sericin using pronase E with an amount equal to the raw glycoprotein.



Physical Chemistry

Theoretical Study of the Charge Transport Properties of Naphthalene Tetracarboxylic Diimide Organic Semiconductors Based on Different π-Core Extensions

PAN Jiazheng, SUN Xiaoqi, REN Aimin, GUO Jingfu

2023, 44(12):  20230372.  doi:10.7503/cjcu20230372

Asbtract ( )   HTML ( )   PDF (6622KB) ( )  

Figures and Tables | References | Related Articles | Metrics

n Type organic semiconductor materials（OSCs） are essential in logic complementary circuits， but their related development has lagged behind relatively due to their poor air stability and low mobility. In this work， the charge transport properties of several typical n type OSCs naphthalene tetracarboxylic diimide（NDI） based on different π-core extensions were analyzed by first principles simulation to elucidate the charge transport properties in term of the single-molecule structural features， intermolecular stacking modes， and intermolecular interactions， respectively. The results show that all of the studied molecules also have good air stability and exhibit electron transport properties. Among them， A2 with a long axis π extension has a high electron affinity（EA） and the best air stability. Secondly， compared to NDI molecule， the reorganization energies of the NDI organic semiconductors with the long-axis/short-axis π-extension were all reduced， but the origin for their decreased reorganization energy were found to be distinctly different according to the normal modes analysis. Compared to the A1 molecule， the vibrations of the A2 with the short axis π extension was effectively suppressed in the high-frequency region， whereas the vibrations of the A3 and A4 molecules extended along the long axis were suppressed in both the high and low-frequency regions， resulting in a reduction of the reorganization energy. Finally， the nearest-neighbour dimer stacking of studied molecular crystals was analyzed， and it was found that A3 and A4 have small short-axis sliping and behave as 2D electron transport materials， with 2D average electron mobility of ca. 0.06 and 0.15 cm²·V^‒1·s^‒1， respectively； while A2 has larger short-axis slip and thus behaves as 1D transport materials， with their 1D electron mobility as high as 0.96 cm²·V^‒1·s^‒1. In this paper， the relationship between molecular structure-molecular stacking patterns-electron transport properties of several typical n type OSCs NDI with different core structures was analyzed through theoretical computational simulations， which provides useful design ideas for the design of stable high-performance electron transport materials.



Structure and Properties of One-step Prepared Nano-silver Supported Melamine Foam Based Phase Change Composites

ZHANG Ziwen, DONG Mingyang, CHU Yao, LI Wei, CAI Yibing

2023, 44(12):  20230222.  doi:10.7503/cjcu20230222

Asbtract ( )   HTML ( )   PDF (16041KB) ( )  

Figures and Tables | References | Related Articles | Metrics

The lightweight and flexible melamine foam（MF） served as the matrix was placed in a reaction solution consisting of ethylene glycol（EG）， silver nitrate（AgNO₃）， polyvinylpyrrolidone（PVP）， and copper chloride （CuCl₂）. Under high temperature conditions， a redox reaction occurred， resulting in the formation of nano-silver（Ag） on the foam skeleton. Subsequently， the phase change composites were fabricated by encapsulating lauric acid（LA） in foam matrix through vacuum impregnation method. The morphology， structure， and thermal properties of the phase change composites were investigated by scanning electron microscope（SEM）， X-ray diffractometer（XRD）， differential scanning calorimeter（DSC）， and infrared thermal imager， respectively. The results indicated that when the concentration of AgNO₃ was 4 mg/mL， nano-Ag was uniformly and densely deposited on the surface of the MF skeleton， and there were two forms of Ag， nanoparticles（AgNPs） and Ag nanowires（AgNWs）， presented simultaneously. The latent heat of phase change composites could reach up to 144.0 J/g， and the thermal efficiency exceeded 80%， demonstrating superior temperature regulation and heat storage capability. This paper provides a novel strategy for the fabrication of phase change composites with outstanding comprehensive property， thereby being in favor of broadening their potential applications.



Photocatalytic Water Splitting Performance of p-n-Type NiWO₄/ZnIn₂S₄ Heterojunctions

YAN Aihua, GAO Ye, ZHANG Xiaohui, HUANG Fei, ZHANG Tongyang, ZHANG Jixu, ZHAO Wenxue

2023, 44(12):  20230357.  doi:10.7503/cjcu20230357

Asbtract ( )   HTML ( )   PDF (8432KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

In this paper， p-n-type NiWO₄（NWO）/ZnIn₂S₄（ZIS） heterojunctions were constructed by a two-step hydrothermal/water bath method. The influence of different loading amounts for NWO on the composition， morphology， band structure， light absorption and photocatalytic water splitting performance was investigated. The photocatalytic mechanism of NWO/ZIS system was also discussed by a series of advanced characterization tools. The results show that the composition and morphology of ZIS don’t change significantly after loading NWO. Furthermore， the interface between the two materials contacts intimately and the two materials distribute uniformly. Consequently， the hydrogen evolution performance of NWO/ZIS has been markedly improved under the visible-light irradiation. Therein， the highest hydrogen production rate for NWO-35/ZIS samples is 5204.8 μmol·g^-1·h^-1， which is approximately 3.32 times higher than that of pure ZIS（1566.4 μmol·g^-1·h^-1）. The cyclic experiment shows that NWO/ZIS system has excellent photostability. The band calculation and photoelectric dynamic results confirm the photogenerated charge transport mechanism driven by p-n-type internal electric field.



Synthesis of Nanospherical Mo-MOF Materials for Catalytic Selective Oxidation of Thioethers

GUO Haotian, LU Xinhuan, SUN Fanqi, TAO Yiyuan, DUAN Jingui, ZHANG Wang, ZHOU Dan, XIA Qinghua

2023, 44(12):  20230408.  doi:10.7503/cjcu20230408

Asbtract ( )   HTML ( )   PDF (9319KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Metal-organic framework materials are composite materials composed of inorganic metal ions and organic ligands， which have high metal dispersion and catalytic activity. In this paper， an organic framework material Mo-MOF was synthesized using molybdic acid as molybdenum source and terephthalic acid as ligand by static mixed solvothermal crystallization method. The morphology， structure and composition of the materials were characterized by X-ray diffraction（XRD）， Fourier exchange infrared spectroscopy（FTIR）， scanning electron microscopy（SEM） and X-ray photoelectron spectroscopy（XPS）. Mo-MOF catalysts synthesized by static mixed solvothermal method （water and ethanol） showed the best catalytic activity， with 100% conversion of conversion of diphenylthioether and 86.4% selectivity of diphenylsulfoxide in the selective oxidation using oxygen without other additives.



Construction of Carbonic Anhydrase Mimetic Cerium-containing Nanozyme for the Carbon Dioxide Fixation

AI Yanru, CAI Qijun, WANG Jiao, ZHANG Yutong, BAI Yujia, CHEN Xiaoming, LYU Rui

2023, 44(12):  20230355.  doi:10.7503/cjcu20230355

Asbtract ( )   HTML ( )   PDF (3048KB) ( )  

Figures and Tables | References | Related Articles | Metrics

A cerium-containing organophylosilicate（ACOP） was synthesized by one-step sol-gel method under room temperature， and its carbonic anhydrase-like activity was investigated. It was found that ACOP presented a layered structure similar to that of phyllosilicates， and the Ce in the structure is connected to the skeleton by coordination. In addition， ACOP exhibited promising carbonic anhydrase-like catalytic activity and excellent stability under extreme temperature and pH conditions. When the temperature was higher than 70 ℃， the natural carbonic anhydrase showed completely deactivated， while ACOP still retained more than 80% catalytic activity. Moreover， it also maintained about 90% catalytic activity under pH value of 3—9， which is superior to that of natural enzyme. Finally， the as-prepared ACOP was employed for the catalytic conversion of carbon dioxide. It was revealed that the ACOP can efficiently convert carbon dioxide into carbonate and form calcium carbonate precipitation in the presence of calcium ion， thus realizing the fixation of carbon dioxide at room temperature. This study provides a promising strategy for rational design of carbonic anhydrase mimetic nanozyme， as well as proposes a new route for efficient conversion of carbon dioxide.



Green Electrosynthesis Reaction of Potassium Azotetrazolium Salt Coupled by Hydrogen Production from Water Electrolysis by WS₂ Nano Sheets

YAO Tianhao, MA Yuhe, LIU Bolong, MA Yuqiang, ZHANG Cong, LI Jiachen, MA Haixia

2023, 44(12):  20230347.  doi:10.7503/cjcu20230347

Asbtract ( )   HTML ( )   PDF (5908KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

As a four-electron multi-step reaction process with sluggish kinetics， oxygen evolution reaction（OER） limits the reaction rate and reduces the overall efficiency of overall water splitting. Replacing OER with the oxidation reaction of thermodynamically more favorable organic energetic materials and coupling with hydrogen evolution reaction（HER）， so that the high value-added chemical products can be obtained while reducing the overall cell voltage to generate hydrogen. In this paper， a novel coupling system was proposed， in which the energy-containing ionic salt， potassium azotetrazolium salt（K₂AZT）， was prepared on the anode side， and carbon cloth-supported tungsten disulfide nanosheets（CC@WS₂ NSs） were used as HER catalyst to promote the HER on the cathode side. The system only requires a cell voltage of 1.65 V to achieve a current density of 10 mA/cm ²， which is 220 mV lower than that of conventional electrolyzed water（1.87 V）. In addition， the coupled system maintained smooth operation for at least 15 h， showing excellent stability. At the same time， the preparation of energetic compounds by green and safe electrochemical method avoids the problems of high energy consumption， high risk and high cost of traditional organic synthesis method， and provides a new synthesis strategy for the safe production of energetic materials.



Combustion Mechanism Construction Based on Minimized Reaction Network： Combustion of JP-10

LIAO Aixue, LI Yiwei, MAO Yebing, LI Xiangyuan

2023, 44(12):  20230322.  doi:10.7503/cjcu20230322

Asbtract ( )   HTML ( )   PDF (1242KB) ( )  

Figures and Tables | References | Related Articles | Metrics

JP-10（exo-tetrahydrodicyclopentadiene， C₁₀H₁₆） is widely used as a fuel in detonation engines， missiles， and scramjets due to its low freezing point， high volumetric energy density， and high specific impulse. Most of the JP-10 mechanisms found in literature are detailed mechanisms with a large number of species and reactions， making them difficult to use in high-dimensional numerical simulations. In this study， based on the minimized reaction network（MRN） method， the species and reaction steps from the previously developed C₀-C₃ mechanism were expanded to construct a JP-10 combustion mechanism with the minimum number of reaction steps and specified number of species， including 36 species and 57 independent reactions. The mechanism employed fully reversible elementary reactions， and the reaction rate constants were described by a dual-parameter form （A， E） of the Arrhenius equation. The mechanism was validated against experimental data， and the results showed that it could reproduce the ignition delay time and laminar flame propagation velocity of JP-10 combustion within a reasonable error range. The mechanism constructed in this study， based on the MRN method and the dual-parameter Arrhenius rate constant approach， combines a small mechanism size with high predictive accuracy. It can provide support for high-fidelity numerical simulations of JP-10 fuel in engineering-scale combustion chambers.



Simulation of SPICE Model of Diode for Conical Ion-channel I- V Curve

JIANG Jiaqiao, LU Bingxin, XIAO Tianliang, ZHAI Jin

2023, 44(12):  20230384.  doi:10.7503/cjcu20230384

Asbtract ( )   HTML ( )   PDF (1370KB) ( )  

Figures and Tables | References | Supplementary Material | Related Articles | Metrics

Ion rectification is a main property of nanochannel. The ion-channel system with ion current rectification is so-called nanofluidic diode. In this paper， Poisson-Nernst-Planck（PNP） equations model of ion-channel and diffusion-drift model of semiconductor diode were compared， and Simulation Program with Integrated Circuit Emphasis（SPICE） model of diode was suggested， which could be used for I- V characteristic curves simulation of ion-channel system. Comparing I- V curves of several kinds of ion-channel from reported works， that is found that besides the saturated current term of ideal PN junction diode SPICE model， the reverse saturated current term should be used to build SPICE model of ion-channel systems within the ‒2—+2 V experiment range. Usually， PNP equations numerical model has a good fit to conical ion-channel I- V curve experiment. So， firstly based on PNP equations model， a conical ion-channel 2D model with a 10 μm length， a 400 nm base diameter and a 10 nm tip diameter was built in COMSOL multiphysics software， ion-channel systems with a series of surface charge densities in 1， 10 and 100 mmol/L KCl aqua solutions were simulated. After discussed I- V curve properties of conical ion-channel system based on this model， especially composition of diffusion and electrophoresis currents， the suggested SPICE model with the reverse saturated current term of diode would be built. In the SPICE model of conical ion-channel system， junction potential and series resistance of diode could be estimated from PNP model simulation， reverse saturated current and grading coefficient of diode would be set to fit PNP model simulation. As a result， SPICE model fit PNP equations model well simulating I- V curves of conical ion-channel system. SPICE model of ion-channel system would be useful to research the property of nanofluidic diode as an electrical element in electric circuit.



Exploration of Gel-electrolyte Soft Package Sodium-ion Battery

HUANG Huawen, FAN Shanshan, ZHAO Wei, TANG Weichao, GUO Panlong, QIU Yaming

2023, 44(12):  20230340.  doi:10.7503/cjcu20230340

Asbtract ( )   HTML ( )   PDF (5358KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Sodium-ion battery has been widely concerned in recent years because of its unique advantages in low-cost and work in low-temperature environment. The layered oxide cathode is first introduced due to its preparation process similar to that of the LiNi _x Co _y M_1－x－y O₂（NCM） cathode material. However， due to the high residual alkali of sodium base layered oxide cathode and the lack of stability， it is easy to lead to the oxidation and decomposition of electrolyte in the long cycling test， which leads to gas production in the cell， limiting the application and development of soft package sodium-ion battery. In this work， the strategy of gel electrolyte was used to construct gel electrolyte soft package sodium-ion battery. The results show that the gel electrolyte has a significant role in inhibiting the gas production of the cell cycle， and can improve the safety performance of the cell， which provides a new idea for the development of soft packed sodium-ion battery.



Influence of Magnetic Field Assisted Surface Dielectric Barrier Discharge on the Chemical Activity and Sterilization Effect of Plasma Activated Water

LIU Kun, YANG Minghao, ZHOU Xiongfeng, BAI Yang, RAN Congfu

2023, 44(12):  20230327.  doi:10.7503/cjcu20230327

Asbtract ( )   HTML ( )   PDF (4639KB) ( )  

Figures and Tables | References | Related Articles | Metrics

A magnetic field assisted atmospheric pressure air surface dielectric barrier discharge was developed to prepare plasma activated water， and the solution properties of plasma activated water prepared by discharge with and without magnetic field under different discharge voltages and frequencies were studied. Combined with gas-liquid two-phase related chemical reaction networks， the mechanism of the influence of magnetic field on the preparation of plasma activated water by discharge was analyzed. And then the sterilization effect of plasma activated water prepared with and without magnetic field on E. coli was compared under different discharge conditions. The results indicate that the addition of a magnetic field can affect electron collision reactions， and further affect subsequent processes of chain chemical reactions and liquid phase secondary reactions， so as to improve the acidity， conductivity， and the concentrations of NO{}_{\mathrm{3}}^{–}， NO{}_{\mathrm{2}}^{–}， H₂O₂， and ONOOH of plasma activated water， consequently enhancing the sterilization effect on E. coli. For achieving a same sterilization effect， the introduction of a magnetic field significantly reduces the required discharge voltage and frequency， reducing energy consumption. In addition， the reactive species of H⁺， H₂O₂， and ONOOH in the plasma activated water have a synergistic effect on sterilization. The enhancement of various reactive species in the liquid phase is most significant as the magnetic field assists a high voltage and high frequency discharge， and the improvement of sterilization effect is also most obvious at this time.



Fabrication of Bioinspired Bamboo Culm Superhydrophobic Surface Using Templating Method for Anti-icing

ZHAO Shuang, PENG Yun, LIU Chunhua, QIU Yiting, LI Yibao

2023, 44(12):  20230409.  doi:10.7503/cjcu20230409

Asbtract ( )   HTML ( )   PDF (7938KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Based on the natural template of the bamboo culm（Phyllostachys edulis） with multi-scale structures， a biomimetic superhydrophobic surface（SHS） of bamboo stems was successfully fabricated using a fusion strategy of templating method and hydrophobic modification technique with plant wax. The resulted biomimetic material surface of the prepared bamboo culm exhibits superhydrophobic， low adhesion， and self-cleaning characteristics. The research results indicate that the bioinspired SHS of bamboo culm is determined by the synergistic effect of the hill-like microstructure and plant wax with nanoscale laminar structure. Moreover， the SHS possesses the delayed freezing performance under low temperature conditions.



Color Tunable Rare-earth Containing Supramolecular Gels with Improved Luminescent Properties Assembled in a Deep Eutectic Solvent

LEI Nana, YANG Shouye, FAN Liming, CHEN Xiao

2023, 44(12):  20230389.  doi:10.7503/cjcu20230389

Asbtract ( )   HTML ( )   PDF (6821KB) ( )  

Figures and Tables | References | Related Articles | Metrics

In this paper， a kind of environmentally friendly deep eutectic solvent（ChU） was obtained from chloline chloride and urea with a molar ratio of 1∶2. As a low molecular weight gelator， sodium deoxycholate（NaDC） could form gel in ChU with a mass fraction even as low as 1%. With increasing NaDC concentration in ChU， such clear gel gradually became cloudy and then opaque， accompanied with the increasing mechanical strength revealed by rheological testing. The NaDC/ChU gel was formed by densely packed fiber aggregates with tens of microns in length under optical microscopic observations. The well-designed rare-earth complexes， i.e. ［choline］₃［Ln（dpa）₃］（Ln-dpa， Ln=Eu³⁺， Tb³⁺， dpa=2，6-pyridinic acid） were fabricated， which had the same cationic group with ChU and excellent luminescent properties. Then， color tunable supramolecular gels were constructed through doping Eu-dpa or Tb-dpa into NaDC/ChU gels. The results showed that the introduction of deep eutectic solvent as well as the effective isolation and binding of gel matrix greatly improved the photophysical properties of such supramolecular gels compared with other solvent systems or powder states. This work develops a simple and universal strategy to prepare color tunable rare-earth containing supramolecular gel soft materials with highly luminescent efficiency and is also the first attempt in deep eutectic solvent.



Polymer Chemistry

Preparation and Performance of PP/PMIA@PVDF-HFP Composite Air Filter Material

MA Wenlong, GUO Zhuang, ZHANG Wei, CHEN Mingxing

2023, 44(12):  20230344.  doi:10.7503/cjcu20230344

Asbtract ( )   HTML ( )   PDF (5878KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Air pollution caused by particulate matter（PM） is a significant threat to human health， making the development of air filtration materials with high efficiency and low resistance a research priority. In order to improve the filtration performance of polypropylene（PP） melt-blown filter material， a micro/nanofiber composite air filter material was prepared using coaxial electrospinning technology. During the electrospinning process， the spinning solution of poly（vinylidene fluoride-co-hexafluoropropylene）（PVDF-HFP） was used as the skin layer， while the spinning solution of poly（m-phenylene isophthalamide）（PMIA） was used as the core layer， and the PP melt-blown material was used as the substrate. The effects of spinning process and post-treatment on the morphology， pore size， air permeability， and filtration performance of the filter material were studied. During the post-treatment process， the skin layer（PVDF-HFP） will melt and attach to the surface of PMIA nanofibers， which reduced the pores between the fibers， resulting in efficient removal of particle matters in the air. The results show that when the electrospinning time is 60 min， the average pore size of the PP/PMIA@PVDF-HFP composite air filter material is 2.58 μm with an air permeability of 132.74 mm/s. The filtration efficiency of PM2.5 can reach 97.67%， with a filtration resistance of only 45.1 Pa. Moreover， the composite filter material exhibited excellent filtration performance under different wind speeds， particle concentrations， and long-term use. In conclusion， the filtration performance of PP melt-blown filter material was improved via the introducing of PMIA@PVDF-HFP nanofiber membrane. The findings of this study provide important information for future research in this field.



Interfacial Stereocomplexation of Electroactive Poly（lactic acid） Nanofibrous Membranes for Efficient Filtration of Airborne PMs

LI Xiaochuan, TANG Mengke, ZHU Jintuo, HE Xinjian, XU Huan

2023, 44(12):  20230311.  doi:10.7503/cjcu20230311

Asbtract ( )   HTML ( )   PDF (5936KB) ( )  

Figures and Tables | References | Related Articles | Metrics

Poly（lactic acid） membrane has great potential in the field of biodegradable air filtration materials， but the low proportion of electroactive phase leads to weak dielectric properties of the membrane， making it difficult to meet the requirements for capturing of high-performance filter materials for airborne particulate matters（PMs）. Herein， the stereocomplex（SC） composed of poly（L-lactic acid）（PLLA） and poly（D-lactic acid）（PDLA） was employed to provide the proportion of high electroactive phase formation， and the stereocomplexed interface of electroactive poly（lactic acid） nanofiber membrane was established by coaxial electrospinning strategy. By adjusting the injection speed during spinning， fiber morphology and the formation of carbonyl（C=O） dipole， β crystal phase and interfacial stereocomplex crystals（SCs）， the nanofiber membrane of core-shell（CS） structure obtained has improved surface potential（9.3 kV） and dielectric constant of 1.60. The mechanical properties of the composite fiber membrane with interfacial stereocomplex were significantly improved. The tensile strength and Young’s modulus of core-shell 1.5（CS1.5） nanofiber membrane reached 17.2 MPa and 351.1 MPa， respectively， which were obviously superior to the pure PLLA membrane. More importantly， the enhanced electrical activity significantly enhanced the filtration efficiency of poly（lactic acid） nanofiber membranes for PM_0.3 and PM_2.5， and the stereocomplexed interface had a unique advantage in dealing with dust collection at high flow rate. The filtration efficiency of CS1.5 nanofiber membrane increased from 82.5% at 10 L/min to 97.9% at 85 L/min. Furthermore， we developed the strategy of using interfacial stereocomplex to stimulate the electroactivity of poly（lactic acid） for the first time， providing valuable insights for solving the application bottleneck of poly（lactic acid） membrane filtration materials.



Surface Morphologies of Polyzwitterionic Brushes Induced by Electrostatic Strength and Counterion Valence

HAO Qinghai, YANG Fan, QING Che, TAN Hongge

2023, 44(12):  20230279.  doi:10.7503/cjcu20230279

Asbtract ( )   HTML ( )   PDF (3603KB) ( )  

Figures and Tables | References | Related Articles | Metrics

The surface phase behavior of planar polyzwitterionic brushes was studied by molecular dynamics simulations. The evolution of the surface morphologies of polyzwitterionic brushes with the strength of electrostatic interaction in the presence of counterions with different valences was investigated. When the electrostatic interaction was gradually enhanced， the microphase separation of the polyzwitterionic brush occurred in all three cases to form a pinned micelle structure. Combining brush height， density distribution function， and backbone monomer pair correlation functions， the changes of micelle size and particle stacking state in micelles were analyzed. The difference between monovalent and multivalent counterions in inducing the phase structure of polyzwitterionic brushes was revealed by calculating the fractions of four states of positive counterions in the brushes.