POLYMER BULLETIN
·
2021
·Vol. 79
·期 11
·9717-9740
·
IF 2.87
Wu Guangfeng,Song Xin,Yang Zhihui,Li Yingchun,Zhang Huixuan
Waterborne polyurethane (WPU) prepolymer with acrylate terminal was prepared by using hydroxyethyl acrylate as an end-capping agent. Modified gelatin (mGH) was prepared by grafting vinyl groups which were obtained from hydrolysis and condensation of vinyl trimethoxysilane onto the renewable natural polymer material cold-water fish skin gelatin. Due to the excellent biodegradability and mechanical properties of cold-water fish skin gelatin, mGH was introduced into the WPU backbone by covalent bonding to improve WPU comprehensive property. The vinyl groups in mGH and the acrylate ends in the WPU prepolymer were connected by UV curing to prepare biodegradable and renewable mGH/WPU chemical hybrid materials. The test results showed that the film-forming properties, the water resistance and thermal stability of WPU were improved by covalent bonding. Water contact angle increased from79.6° to 96.5°, and the maximum thermal degradation rate temperature increased from 340 to 400 °C. In addition, incorporation of mGH with high modulus improved the moduli and yield strength of WPU, in which the yield strength increased from 11.3 to 18.2 MPa. The degradation performance of mGH/WPU chemical hybrid materials was also evaluated that the degradation rate reached 68% in 0.6% lipase PBS solution and 56% in soil after 60 days. The study provides a novel polymerization method for preparing high biodegradable decorative coatings and prints of specialty metals, polymer plastics and certain types of woodware as well as medical scaffold materials. Graphical abstract
研究领域:
材料科学
·
高分子化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 6
·4092-4103
·
IF 4.682
Chen Zongchen,Jiang Jiwei,Wang Xin,Zhang Hui,Song Bo,Dong Bin
Inspired by the swarming behavior of various bacteria in nature, light-driven micromotor with collective behavior has attracted a great deal of attention, which will be a valuable tool to understand the cooperation and communication between bacterial populations and will contribute to the creation of reconfigurable microrobots and the cooperative transportation of large cargoes. However, it is still challenging to modulate the micromotors’ collective behavior based on local interaction and communication. Herein, we develop a light-powered BiVO 4 -based micromotor with self-propulsion and dynamic ‘predator-bait’ collective behavior, which is based on the photocatalytic reaction of BiVO 4 . The BiVO 4 -based micromotor has great potential in the field of organic pollutant degradation with enhanced apparent rate constant (0.076 min −1 ) which originates from the dynamic ‘predator-bait’ behavior.
研究领域:
材料科学
·
环境科学
·
仿生学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 11
·1-10
·
IF 6.408
Fan Ru,Tian Jinrong,Wang Huili,Wang Xuedong,Zhou Peipei
By employing NH 2 -MIL-88 as a template, we synthesized the intermediate Fe@CN under high-temperature calcination and further fabricated the FeS 2 @CN nanocomposites in the presence of sulfur powder. Under varying temperatures (300–600 °C) and Fe@CN-to-S ratios (1:3–6), FeS 2 @CN 500-5 nanocomposites had the highest peroxidase-mimetic activity. Under optimized conditions (incubation temperature 40 °C; solution pH 4.0 and nanocomposite concentration 10 μg/mL; 652-nm absorption), the Michaelis-Menten constant ( K m ) of FeS 2 @CN was much lower than that of horseradish peroxidase (HRP), therefore demonstrating that it had a higher affinity for both chromogenic substrates than conventional HRP. The limits of detection for H 2 O 2 and glucose were 0.15 and 0.30 μmol/L, respectively, and the recoveries for glucose were 91.8–103% with RSDs <5.2%. The novelty of this study lies in (1) the FeS 2 @CN was confirmed to possess stronger enzyme-mimetic activity than its precursors (NH 2 -MIL-88 and Fe@CN); (2) the enhanced activity resulted from the unsaturated sites of N and S doping and the plentiful defects on the porous carbon surface; and (3) free radical trapping experiments evidenced that •OH played a major role in the catalytic reaction, while h + and •O 2 − simultaneously participated in the catalytic process. These convincing performance metrics lead us to postulate that the FeS 2 @CN-based colorimetric biosensor provides a promising approach for several real-world applications, such as point-of-care diagnosis and workplace health evaluations. Graphical abstract
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 17
·10473-10487
·
IF 4.21
Zhang Zheng,Kong Dezheng,Sun Heng,Sun Ling,Dong Chaohong,Lu Zhou
Abstract Modified flame retardant cotton fabrics were prepared by introducing a novel aminoethylpiperazine spirocyclic pentaerythritol bisphosphonate functional heptamethyltrisiloxane (ASPBH). The structure of the synthesized ASPBH was characterized using nuclear magnetic resonance ( 1 H and 31 P) and Fourier transform infrared spectra (FTIR). ASPBH successfully attached to the surface of cotton fibers, which was proved by the results of scanning electron microscope (SEM) combined with energy dispersive X-ray spectroscopy. The flame retardancy of ASPBH-treated cotton fabrics was further improved. The limiting oxygen index (LOI) value reached 30.4%, the residual char length was reduced to 7.5 cm, and there was no afterflame and afterglow. However, the LOI of untreated cotton fabric is only 18%, and the vertical burning test cannot be completed. Thermogravimetric analysis results showed that the modified cotton fabrics has excellent thermal stability, which can also be seen from SEM analysis of char residues. In addition, addition of ASPBH caused the peak heat release rate and total heat release decrease from 232.1 to 177.2 kW/m 2 and from 6.5 to 5.0 MJ/m 2 , respectively. And the treated cotton fabrics released less smoke than untreated ones during the combustion, which would greatly reduce combustion harm. Based on analysis of condensed phase at different temperatures, the thermal degradation mechanism of ASPBH on cotton fabrics was presumed. Graphic abstract A novel aminoethylpiperazine spiro pentaerythritol bisphosphonate functional heptamethyltrisiloxane (ASPBH) can be dissolved in a mixed solution of ethanol and water to prepare a flame retardant treating solution. The original cotton fabric was immersed for a certain period of time under certain conditions, then it was dried and solidified to complete finishing process. Treated cotton can form a stable SiO 2 char layer at high temperature and release less smoke.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·5919-5928
·
IF 2.289
Bi Songhu,Chen Chuntan,Zhang Qiyi,Li Jingde,Li Meimei,Xian Yupei,Shui Yonggang,Yao Yongyi
The oxygen evolution reaction (OER) electrocatalysts are of significances for energy storage or conversion. However, the preparation of excellent electrocatalysts and their utilizations are still great challenges. In this paper, the in situ enrichment of cobalt by sulfate-reducing bacteria (IEC-SRB-Xs) with more uncovered by-production was successfully cultured and carbonized to serve as the OER electrocatalysts triumphantly. The carbonized remains of IEC-SRB-1.00 (named SRB-1.00) showed an excellent potential 1.553 V at current density 10 mA cm −2 , and Tafel slope was 47 mV dec −1 . Moreover, the SRB-1.00 performed constant activity and without any decline of activity after 24 h of OER testing. In addition, the SRB-1.00 exhibited high electron transfer efficiency of 0.803. Therefore, The IEC-SRB-Xs have potential to be a new approach to prepare OER electrocatalyst for water oxidation.
研究领域:
微生物学
·
电化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 1
·137-147
·
IF 1.371
Wang Zhongtang,Xie Yun,Lin Jinxian,Li Zejun,Tan Zhaoyi
New method was developed to analyze Pu and Am sequentially for soil and sediment by inductively coupled plasma mass spectrometry (ICPMS). The developed method uses conc. HNO 3 to leach Pu and Am, Fe(OH) 3 coprecipitation to remove alkali and alkaline metals, extraction chromatographic separation using UTEVA, DGA and TEVA resins to remove interfering elements (IEs) and separate Pu and Am from each other, and sector field-ICPMS to measure Pu and Am. The analysis of four standard reference materials showed that both Pu isotopes and 241 Am were accurately determined by this method, as a result of its excellent decontamination ability of IEs. Especially the high decontamination factor of Pu [DF(Pu), 4.2 × 10 2 ] in Am fraction and high DF(Am) (7.0 × 10 3 ) in Pu fraction sufficiently eliminated the cross interference between 241 Pu and 241 Am in ICPMS measurement. In addition, stable and high chemical recoveries were achieved for Pu (71–91%) and Am (70–88%). The low LODs of Pu isotopes, short analytical time (14 h) and high DFs of IEs allows this method to sequentially analyze Pu and Am, for both global fallout and nuclear accident sourced samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 10
·1-8
·
IF 1.81
Guo Tong,Li Changgeng,Wang Yue,Wang Yi,Yue Jianling,Tang Xiu-Zhi
There is usually a tough trade-off between the mechanical property and the shielding performance in electromagnetic interference shielding (EMI) materials, especially for those ultrathin and porous film-based devices. Herein, we report an ultrathin and flexible RGO/CNF@Ag–Fe 3 O 4 (RGCF) porous film for EMI shielding application by a vacuum-assisted filtration method and a hydrazine-induced foaming process. The RGCF-3 porous film exhibits outstanding mechanical properties with a tensile strength of 175.5 MPa. As expected, the EMI shielding effectiveness of the lightweight RGCF-3 porous film (21.0 dB) is much higher than that of the compact film (10.4 dB), due to the improved efficient wave attenuation within the cellular space. Therefore, the flexible and lightweight RGCF porous film with applicable EMI shielding and superior mechanical strength is highly promising for applications in wearable electronics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 5
·3438-3450
·
IF 3.006
Liu Yan,Wang Chao,Xia Zhenzhen,Wang Qiao,Duan Shuo
A method for monitoring the freshness of crayfish by near-infrared spectroscopy combined with chemometrics was proposed in this study. The total volatile basic nitrogen (TVBN), K value and biogenic amine were adopted as the indexes of freshness. The 120 peeled and the 120 whole tail samples were utilized to build the quantitative models by partial least squares (PLS) regression, respectively. The spectral pretreatment and the variable selection methods were adopted to further improve the models. For the models of TVBN and K value, the combination of continuous wavelet transform (CWT) and randomization test (RT) method could improve the predictability effectively. The combination of 1st derivative and RT method could get better results for the optimization of the biogenic amine models. The optimized models were evaluated by 40 peeled and the 40 whole tail samples, and then utilized to predict the three indexes in another 32 peeled tails and 40 whole tail samples for practical application. Reasonable results were obtained for the samples with TVBN levels ranging from 28.01 mg/kg to 284.89 mg/kg, K value levels ranging from 13.04 to 87.36% and biogenic amines ranging from 148.57 mg/kg to 663.71 mg/kg. For the TVBN, K value and biogenic amine in the 32 peeled tail samples, the correlation coefficients between the results calculated by the optimized models and those measured by the standard methods were 0.95, 0.94 and 0.96 respectively. As to the three freshness indexes in 40 whole tail samples, the correlation coefficients were 0.95, 0.93 and 0.94, respectively.
研究领域:
食品科学
·
光谱学
·
化学计量学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Zhang Jinmeng,Yan Jianlong,Zhao Yanan,Zhou Qiang,Ma Yinxing,Zi Yaxian,Zhou Anan,Lin Shumin,Liao Longhui,Hu Xiaolan,Bai Hua
Load bearing/energy storage integrated devices (LEIDs) allow using structural parts to store energy, and thus become a promising solution to boost the overall energy density of mobile energy storage systems, such as electric cars and drones. Herein, with a new high-strength solid electrolyte, we prepare a practical high-performance load-bearing/energy storage integrated electrochemical capacitors with excellent mechanical strength (flexural modulus: 18.1 GPa, flexural strength: 160.0 MPa) and high energy storage ability (specific capacitance: 32.4 mF cm −2 , energy density: 0.13 Wh m −2 , maximum power density: 1.3 W m −2 ). We design and compare two basic types of multilayered structures for LEID, which significantly enhance the practical bearing ability and working flexibility of the device. Besides, we also demonstrate the excellent processability of the LEID, by forming them into curved shapes, and secondarily machining and assembling them into complex structures without affecting their energy storage ability.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 94
·期 2
·393-405
·
IF 2.008
Zhao Ruoxi,Xu Huifang,Zhong Zhengxiang,Xu Hao,Zhang Haijiao
Resorcinol–formaldehyde (RF) aerogels are widely used as thermal insulation materials. The present investigation of RF aerogels emphases on improving hydrophobic property and high-temperature residual yields. In this study, polysiloxane-modified RF composite xerogel monoliths were prepared by gelation of poly(methylphenylsiloxane) prepolymer with RF in cosolvent and ambient pressure drying. The influence of phenyl content on structure and thermal property of xerogels was investigated. The as-prepared RF composite monoliths were lightweight and hydrophobic with density lower than 0.300 g/cm 3 and water contact angles approaching 130°. Morphology analyses indicated that polysiloxane grew and formed a continuous layer on RF porous skeleton with controlled reaction parameter. Thermogravimetry analyses (TGA) certified that the controlled incorporation of polysiloxane in composite xerogels enhanced the thermal degradation temperature at which the weight loss of RF xerogels reaches 5% ( T 5% ) and increased the residual yields at 1000 °C. The carbonized derivatives were obtained for further enhancing the thermal stability by removal of small molecules during carbonization. Xerogel monoliths preserved hydrophobic property till 500 °C carbonization due to the thermal stability of poly(methylphenylsiloxane). The heat-resistant composite xerogels remained monolith structure after 800 °C treatment under nitrogen condition.
The prepared composite xerogels were lightweight, hydrophobic, and thermal resistant. The hydrophobic property was preserved for 500 °C-carbonized derivatives. The heat-resistant composite xerogels remained monolith structure after 800 °C carbonized treatment under nitrogen condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ISME Journal
·
2021
·Vol. 15
·期 9
·2561-2573
·
IF 10.302
Ni Haowei,Jing Xiaoyan,Xiao Xian,Zhang Na,Wang Xiaoyue,Sui Yueyu,Sun Bo,Liang Yuting
Understanding the effects of changing climate and long-term human activities on soil organic carbon (SOC) and the mediating roles of microorganisms is critical to maintain soil C stability in agricultural ecosystem. Here, we took samples from a long-term soil transplantation experiment, in which large transects of Mollisol soil in a cold temperate region were translocated to warm temperate and mid-subtropical regions to simulate different climate conditions, with a fertilization treatment on top. This study aimed to understand fertilization effect on SOC and the role of soil microorganisms featured after long-term community incubation in warm climates. After 12 years of soil transplantation, fertilization led to less reduction of SOC, in which aromatic C increased and the consumption of O-alkyl C and carbonyl C decreased. Soil live microbes were analyzed using propidium monoazide to remove DNAs from dead cells, and their network modulization explained 60.4% of variations in soil labile C. Single-cell Raman spectroscopy combined with D 2 O isotope labeling indicated a higher metabolic activity of live microbes to use easily degradable C after soil transplantation. Compared with non-fertilization, there was a significant decrease in soil α- and β-glucosidase and delay on microbial growth with fertilization in warmer climate. Moreover, fertilization significantly increased microbial necromass as indicated by amino sugar content, and its contribution to soil resistant C reached 22.3%. This study evidentially highlights the substantial contribution of soil microbial metabolism and necromass to refractory C of SOC with addition of nutrients in the long-term.
研究领域:
生态学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 3
·1-15
·
IF 2.533
Zhang Haifeng,Zhang Gongguo,Zheng Yiqun,Zhao Na,Ma Yanyun,Liu Feng,Liu Maochang
Gold–palladium (AuPd) alloy nano-corolla are successfully prepared in high purity, followed by exploration as electrocatalysts for electroxidation of ethanol (EOR) in alkaline medium. Applying kinetics control on the one-pot formation process using a syringe pump is emphasized, where the Au/Pd precursor solution is dropwise titrated into the reaction mixture containing capping agent and reductant at an elevated temperature. We perform systematical investigation towards the morphology evolution pathway and effects of several key parameters. After loading on carbon black, the current AuPd alloy nano-corolla exhibit superb specific activity, reaction kinetics, and operation stability for EOR, showing morphological and structural merit. The present study provides insight into fabrication of bimetallic alloy nanocrystals with open structure, which could find important use in crystal engineering for multimetallic nanocrystals and rational design of fuel cell electrocatalyst. Graphical abstract Gold–palladium (AuPd) alloy nanocrystals in the form of corolla are successfully prepared via kinetic-controlled synthesis in high purity, exhibit improved activity and stability as EOR electrocatalysts in KOH solution
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）