JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 3
·1-17
·
IF 2.8
Chen Dongming,Li Ziwei,Li Dacheng,Li Shanrong,Mo Jing,Zheng Zijian,Lu Shaorong
In this study, a new type of compatibilizer, benzamide-grafted polyethylene polyamine (PEPA) containing solvent chain (PDABA-g-PEPA-O) was prepared from PEPA, 3,5-diaminobenzoic acid (DABA) and Oleoyl chloride (OC) and used to modify sisal microcrystalline cellulose (MCC). The natural rubber (NR) was filled with the modified MCC to prepare composites. The compatibilization effect of the prepared compatibilizer on the NR/MCC/PEPA-g-PDABA-O composites was investigated and its compatibilization mechanism was analyzed by molecular dynamics simulation (MD). The results show that adding 3wt% (calculated by MCC mass) PDABA-g-PEPA-O can improve the interfacial interaction between NR and MCC. The highest tensile strength of the NR composites was 25.319 MPa when 2.5phr MCC and 3wt% of PDABA-g-PEPA-O were added and is improved by 13.07% compared with that of NR/2.5phr MCC composites. In addition, the MD results showed that the amide and amine groups in the molecular structure of PDABA-g-PEPA-O formed a strong hydrogen bond and a strong van der Waals interaction with the hydroxyl groups of cellulose and PDABA-g-PEPA-O exhibited good compatibility with NR, which achieved the purpose of compatibilization. Moreover, the properties of tensile, deformation and shear resistance of the composites were enhanced with the addition of PDABA-g-PEPA-O in molecular simulation. The MD results provided a basis for the molecular design and preparation of compatibilizers and understanding their compatibilization mechanism in the polymer composites at a molecular level.
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ENERGY & FUELS
·
2023
·
IF 5.3
Zhiqi Zhao,Xue Xia,Yanan Li,Daiwei Liu,Wei Cai,Chuanxian Li,Guangyu Sun,Bo Yao,Fei Yang
Dodecylbenzenesulfonic acid (DBSA) is injected into wellbores as an asphaltene dispersant to alleviate asphaltene deposition problems. The addition of DBSA will change the dispersion of asphaltenes in the crude oil, affecting the wax precipitation property of the crude oil as well as the adsorption behavior of asphaltenes at the oil–water interface, thus significantly altering the W/O emulsion’s stability. In order to provide better theoretical guidance for oil–water separation in oilfield gathering and production processes, in the paper, the effects of DBSA concentration (from 0 to 500 ppm) on the emulsions’ stability containing both asphaltenes and paraffin wax and the mechanism were systematically investigated at two different temperatures (30 and 15 °C) based on the wax precipitation and rheological properties of the model crude oil, the oil–water interface adsorption properties, and the macroscopic and microscopic properties of the emulsion. The outcomes demonstrated that the test temperature had a highly substantial impact on the model emulsion. The main element affecting the stability of the emulsion at 30 °C (above the wax appearance temperature (WAT)) was the interfacial structure’s strength. The low-temperature flowability of the oil phase primarily controlled the process of emulsion stabilization at 15 °C (below the WAT). Furthermore, we speculate that the wax crystals could precipitate on the surface of the emulsified droplets, which also facilitated emulsion stability at 15 °C. Combining the above experimental observations, the mechanism of DBSA concentration affecting the emulsion stability was proposed, which would contribute to solving the issues in the emulsion breaking and dewatering process of crude oil emulsions.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Jing Zhao,Zicheng Cai,Yue Fan,Yunan Wang,Yu Song,Jie Liu,Shuangwen Li,Di Guo,Xiaoxia Liu
Potassium ion capacitors (PICs) are regarded as promising large-scale aqueous energy storage systems. However, due to the poor K + transport kinetics and the structural instability of the cathode materials, the key issues of limited energy density and poor cyclic stability are obstacles to the in-depth growth of PICs. Herein, a novel O-doped perovskite fluoride is demonstrated via an in-situ electrochemical oxidation strategy as the cathode for PICs, introducing additional defects that improve the capacitance and facilitate the reaction kinetics of the electrode. During the electrochemical oxidation process, it is discovered that the perovskite fluoride crystal tends to transform into disordered O-doped KMnF 3 (K x MnF y O z ), realizing a structural reconstruction at the electrode material/electrolyte interface. The First-principles calculations based on density functional theory (DFT) are performed to confirm that the improved electrical conductivity and low ionic adsorption energy may be ascribed to the substitution of oxygen for fluorine. The obtained K 1.14 MnF 1.17 O 1.26 cathode achieves a high specific capacitance of 694 F g –1 at 1 A g –1 , as well as high capacitance retention of 91.3% after 10,000 charge/discharge cycles in mild K 2 SO 4 electrolyte. This study provides an effective strategy to improve the capacitive performance of perovskite fluoride cathode materials in electrochemical energy storage.
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Materials Today Communications
·
2022
·
IF 3.662
Lijie Zhang,Weiqun Tan,Mei Zhang,Zhengfa Ma,Tiantao Zhao,Yunru Zhang
Hyaluronic acid (HA)/carboxymethyl chitosan (CMCS) hydrogel was synthesized by using 1-(3-dimethylaminopropyl) − 3-ethylcarbondiimide (EDC) and N-hydroxysuccinimide (NHS) as chemical cross-linking agents. The panax notoginseng saponins (PNS) loaded HA/CMCS hydrogel was prepared by immersion method. The swelling, sustained-releasing, biocompatible, anti-inflammatory and anti-oxidant properties of the hydrogel were investigated, and healing effect of the hydrogel was verified by applying it to skin wound in typeⅡdiabetic SD rats. The results showed that HA/CMCS hydrogel had good swelling property and could absorb water up to 46 times of its own dry weight. The PNS was continuously released in the simulated body fluid for 24 h, and the release rate was 76 %. In vitro cytotoxicity, anti-oxidant and anti-inflammatory experiment of inhibiting macrophage secretion of NO showed that the addition of low concentration PNS(≤5 mg/mL) facilitated cell proliferation and improved the biocompatibility. The ABTS free radical scavenging rate of HA/CMCS-PNS can reach 99 %. In animal experiments, HA/CMCS-PNS hydrogel significantly improved the wound healing speed of SD rats, decreased the expression of TNF-α and IL-6, quickly enhanced the expression of IL-10, and attenuated the body's inflammation response. In the process of wound healing, HA/CMCS-PNS hydrogel up-regulated the expression of VEGF and bFGF in wound, promoted angiogenesis and epithelial cell regeneration, and synergistically promoted the rapid wound healing.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 3
·1-9
·
IF 5.479
Ma Yujun,Yu Ying,Lin Bixia,Zhang Li,Cao Yujuan,Guo Manli
Copper nanoclusters (CuNCs) were synthesized starting from glutathione and copper(II) nitrate. They show blue fluorescence peaking at 432 nm when excited at 334 nm. In the presence of o -phenylenediamine (OPD), the blue fluorescence is decreased, but a yellow fluorescence appears with a peak at 557 nm. UV-visible absorptiometry, fluorometry and fluorescence lifetime measurements were used to show that OPD is oxidized by the small fraction of copper(II) ions present in the CuNCs to form the oxidized form of o -phenylenediamine (oxOPD) which displays weak yellow fluorescence, while the blue fluorescence decreases. The ratio of fluorescences at 557 and 432 nm increases linearly in the 0.15 to 110 μg·L −1 OPD concentration range, and the detection limit is 93 ng·L −1 . Compared to the method based on the use of dissolved Cu(II), the employment of CuNCs reduces the detection limit by a factor of 40. The method was applied to the determination of OPD in spiked environmental water and industrial wastewater samples. Recoveries ranged from 96.8 to 100.3%.
Schematic presentation of a ratiometric fluorometric method for detection of o-phenylenediamine (OPD) based on copper nanoclusters (CuNCs). OPD is oxidized by Cu 2+ present in CuNCs to form the oxidized form of o -phenylenediamine (oxOPD). FRET occurred between oxOPD and CuNCs, and the F 557 /F 432 value is amplified.
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DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
·
2018
·
IF 1.883
Yi Chen,Qianming Du,Qianqian Guo,Jing Huang,Lina Liu,Xiangchun Shen,Jianqing Peng
The CaCO3 encapsulated liposome with pH sensitivity is an efficient carrier for the delivery of chemotherapeutic drugs. Herein, we provided an innovative method that take advantage of a W/O emulsion to prepare CaCO3 encapsulated liposomes for the delivery of curcumin. The liposomes with both CaCO3 and curcumin encapsulated (LCC) showed high sensitivity to reduced pH (the environment of lysosomes). Due to the inherent pH sensitivity of CaCO3, LCC swelled and released the encapsulated curcumin rapidly in acidic medium. The lysosome escape capability and promoted accumulation of curcumin in the cytosol from LCC was verified with respect to that of curcumin loaded liposomes (CLIPO). Despite the similar cytotoxicity within curcumin preparations in vitro at high concentration, LCC exhibited optimal antitumor effect in an azoxymethane (AOM)/dextran sodium sulfate (DSS)-induced colorectal cancer model, which was attributed to the long circulation time and efficient intracellular delivery of curcumin from LCC. It is suggested that the solubility and cytosolic delivery of curcumin are greatly improved by LCC, which accounts for the increased pharmacodynamic effect of curcumin. Thus, the CaCO3 encapsulated liposomes developed in this study is an ideal carrier for the hydrophobic drugs in potential clinical application.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Lulu Qu,Gen Zhu,Jie Ji,T. P. Yadav,Yijiang Chen,Guohai Yang,Hui Xu,Haitao Li
Organic pollutants are harmful to human health, which creates a global need for the development of novel and effective materials for efficiently removing contaminants. Accordingly, an efficient visible light-driven heterostructured membrane combined with oxygen-modified monolayer g-C3N4, graphene oxide, and nitrogen-doped carbon nanotubes (CNTs) (O-g-C3N4/GO/N-CNT) was successfully fabricated through electrostatic interactions and subsequent vacuum filtration. The results suggested that the O-g-C3N4/GO/N-CNT membrane exhibited higher degradation rate than those of O-g-C3N4/GO and pure O-g-C3N4 under visible light exposure. This enhanced photocatalytic performance was attributed to the introduction of GO and N-CNT, which acted as electronic acceptors for monolayer O-g-C3N4 that effectively inhibited recombination of photogenerated electron–hole pairs, thus enhancing visible light photocatalytic activity. Furthermore, the enrichment and degradation rates of O-g-C3N4/GO/N-CNT membranes were demonstrated for tetracycline hydrochloride, which were found to be 96.64 and 94.30%, respectively, and no distinct enrichment or catalytic activity reduction was observed when their reusability was measured. These results suggested that these recyclable O-g-C3N4/GO/N-CNT membranes provide a new strategy for the highly efficient removal of environmental pollutants.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Lu-Lu Qu,Zhi-Qin Geng,Wen Wang,Kai-Chun Yang,Wei-Peng Wang,Cai-Qin Han,Guo-Hai Yang,Robert Vajtai,Da-Wei Li,Pulickel M. Ajayan
A three-dimensional (3D) substrate was developed by assembling a monolayer of graphitic carbon nitride (O-g-C 3 N 4 ) on Ag nanorod arrays (Ag NRs) for sensitive and recyclable surface enhanced Raman scattering (SERS) detection. The prepared Ag NRs/O-g-C 3 N 4 substrate not only generated a significant Raman enhancement effect as a result of the strong π-π stacking interaction between O-g-C 3 N 4 and the analytes but also possessed excellent self-cleaning property via visible-light irradiation that was attributed to its outstanding catalytic performance. Highly sensitive SERS detection could be achieved with a LOD of 8.2 × 10 −10 M for R6 G, and the substrate could be used repeatedly for at least four cycles with tolerable intensity attenuation. In addition, the 3D substrate exhibited long-term stability originating from the electron-donor effect of O-g-C 3 N 4 and high reproducibility due to the uniform decoration of O-g-C 3 N 4 on the Ag NRs through the strong interaction. Furthermore, using Ag NRs/O-g-C 3 N 4 , the recyclable detection of antibiotics in a water sample was demonstrated with high sensitivity, which indicates that the 3D Ag NRs/O-g-C 3 N 4 substrate is a promising candidate for eliminating the challenges of single-use SERS substrates and building a portable SERS platform to sense organic molecular species.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 4
·e4719
·
IF 3.259
Beibei Wang,Xiaoli Sheng,Yuming Zhou,Zhiying Zhu,Yonghui Liu,Xiao Sha,Chao Zhang,Huaying Gao
A novel strategy was proposed for the fabrication of high-performance acidic mesoporous poly ionic liquids catalyst. In this work, mesoporous poly ionic liquids (MPILs) were synthesized with P123 (PEO 20 PPO 70 PEO 20 ) served as pore-forming agent. Then, MPILs were treated with PW 3− anion exchange, thereby fabricating PW/MPIL-S(x). MPIL and PW/MPIL-S(x) were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), Thermogravimetric analysis (TA), N 2 adsorption–desorption and Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS) spectra. The effect of solvent and concentration of P123 on the morphology and mesoporous structure of MPILs were investigated systematically. And the results show that MPILs were featured with mesoporous channel structure, high surface area (up to 737 m 2 /g) and large pore volumes (1.16 cm 3 /g), which benefit heterogeneous phase reaction (such as, alkylation of styrene with o -xylene). In the alkylation reaction, under optimal reaction conditions, the catalyst PW/MPIL-THF (4.0 g) shows high conversion of styrene (100%) and PXE yield (96.21%), demonstrating the excellent catalytic activities. Furthermore, PW/MPIL-S(x) are easy to be separated from the catalytic system by filtration and show no obvious decrease in catalytic activity after 6 cycle runs. The obtained PW/MPIL-S(x) catalyst exhibit high thermal and mechanical stability as well, indicating extensive application in high temperature acidic catalysis. This work might open up a new method for the synthesizing of porous polymer catalysts in the future.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2018
·
IF 3.412
Xing Chen,David Julian McClements,Jian Wang,Liqiang Zou,Sumeng Deng,Wei Liu,Chi Yan,Yuqing Zhu,Ce Cheng,Chengmei Liu
Particle-stabilized W1/O/W2 emulsion gels were fabricated using a two-step procedure: (i) a W1/O emulsion was formed containing saccharose (for osmotic stress balance) and gelatin (as a gelling agent) in the aqueous phase and polyglycerol polyricinoleate (a lipophilic surfactant) in the oil phase; (ii) this W1/O emulsion was then homogenized with another water phase (W2) containing wheat gliadin nanoparticles (hydrophilic emulsifier). The gliadin nanoparticles in the external aqueous phase aggregated at pH 5.5, which led to the formation of particle-stabilized W1/O/W2 emulsion gels with good stability to phase separation. These emulsion gels were then used to coencapsulate a hydrophilic bioactive (epigallocatechin-3-gallate, EGCG) in the internal aqueous phase (encapsulation efficiency = 65.5%) and a hydrophobic bioactive (quercetin) in the oil phase (encapsulation efficiency = 97.2%). The emulsion gels improved EGCG chemical stability and quercetin solubility under simulated gastrointestinal conditions, which led to a 2- and 4-fold increase in their effective bioaccessibility, respectively.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17644-17651
·
IF 3.201
Shaobo Li,Tao Zhu,Lichun Dong,Mingdong Dong
Heteroatom doping has been demonstrated to be an effective way to tune the properties of nanomaterials including chemical reactivity and electronic and optical performance. In this study, rGO/g-C3N4 and boron doped rGO/g-C3N4 (B-rGO/g-C3N4) nanocomposites were fabricated via a rapid plasma treatment method, and their photocatalytic performance under visible light radiation was examined. The results showed that the photocatalytic efficiency of B-rGO/g-C3N4 for rhodamine B degradation can be 50% higher than that of rGO/g-C3N4 at an optimum rGO loading of 5 wt%. XPS and FTIR analyses indicated the enhanced C–O–C covalent bonding between rGO and g-C3N4 in B-rGO/g-C3N4, and the optical characterization demonstrated that it could further improve the separation of the photo-generated chargers and narrow the bandgap of the nanocomposite. This work provides an idea that boron doping could be an effective way to promote the chemical interaction between different components in composite materials, which is important in designing and developing new functional nanomaterials.
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JOURNAL OF SEPARATION SCIENCE
·
2018
·Vol. 41
·期 22
·4185-4193
·
IF 2.415
Wenwu Yang,Turghun Muhammad,Aziguli Yigaimu,Kipayem Muhammad,Lingxin Chen
A novel magnetic molecularly imprinted polymer for the selective recognition of auramine O was rationally designed via screening from a library of nonimprinted polymers. A stoichiometric ratio of functional monomer (itaconic acid) and template molecule (auramine O) was found to be 1.5. Meanwhile, the synthesized SiO 2 @Fe 3 O 4 was modified by 0.5 mol/L hydrochloric acid to facilitate the preparation of magnetic molecularly imprinted polymer particles. Adsorption experiments showed that the magnetic polymer particles exhibited good selectivity, recoveries, and enrichment performance. The stoichiometric imprinted polymers have been employed for the selective preconcentration of auramine O from lake water sample. The high specificity of the stoichiometric imprinted polymers was proven in the extraction of mixture solution of auramine O, auramine O hydrochloride, and chrysoidine, and the recoveries ranged between 99.66 and 108.75% (RSD 2.6–3.7%, n = 3) for lake water. These results suggest that this method is effective and can be successfully applied to the analysis of auramine O in environmental water samples.
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