Friction
·
2022
·Vol. 11
·期 7
·1138-1149
·
IF 4.924
Liu Wenrui,Wang Hongdong,Liu Yuhong
Polyalkylene glycol (PAG) aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient (COF, μ < 0.01). However, the prolonged running-in period and low bearing capacity have limited its widespread application. In this study, we determined that the running-in period can be decreased by more than 75% when the pH value of the lubricant is controlled at 3 by introducing various acid solutions. Additionally, less time was required to realize stable superlubricity with inorganic acid at lower pH values. This was mainly attributed to the acceleration effect of hydrogen ions around the contact region. In case of PAG aqueous solution with organic acid, the wear loss between sliding solid surfaces was reduced, and thus the bearing pressure during the superlubricity period was significantly improved from approximately 30 to 160 MPa. Furthermore, the organic acid molecules were considered to form strong hydrogen bonds with PAG macromolecules and solid surfaces. This in turn strengthened the structure of the adsorption layers. The unique effect of different acids in aqueous polymer lubrication can potentially significantly aid in advancing the study of polymer tribology and broadening industrial applications.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 28
·13541-13559
·
IF 4.682
He Geping,Wang Di,HuangFu Huijun,Zhang Cunshe,Zhang Ben,Mi Yuanmei,Zheng Donghao
ZnWO 4 nanomaterials are gaining attention as a kind of multifunctional material in the field of electrochemical energy storage and photocatalysis. However, the controllable adjustment of their nanomorphology and bandgap width limit their wide application. So the nanostructured bifunctional Zn 1− x Ce x WO 4 ( x = 0.020, 0.022, 0.030) with tunable nanomorphology and bandgap width were prepared by a simple one-step hydrothermal method in this work. On the one hand, the microscopic morphology of the Zn 1− x Ce x WO 4 was changed from clusters to nanosheets with the addition of Ce 4+ . On the other hand, the doping of Ce 4+ generated oxygen vacancies and formed defect states in the ZnWO 4 semiconductor, reducing the energy bandgap width. Zn 1− x Ce x WO 4 ( x = 0.022) with the optimal doping ratio (nCe/(nCe + nZn) = 0.022) obtained a specific capacitance of 267.091 F g −1 at a current density of 1 A g −1 and an electrolyte of 6 M KOH, which is 3.7 times as great as the specific capacitance of ZnWO 4 (70.545 F g −1 ). In addition, the catalytic efficiency of Zn 1− x Ce x WO 4 ( x = 0.022) for Rhodamine B (RhB) reached 99.541% in 4.5 h. The doping of Ce 4+ can achieve the dual modulation of the morphology and bandgap width of ZnWO 4 , thus enhancing the electrochemical performance and photocatalytic degradation performance of ZnWO 4 . Graphical abstract
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JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 12
·1-11
·
IF 2.253
Wang Xiaowu,Deng Xi,Wu Liling,Deng Yunmeng,Liu Qiong,Li Ming,Li Zhi
To overcome the poor mechanical performance of methyltrimethoxysilane (MTMS) aerogels and the low thermal stability of polyvinyl alcohol (PVA), the PVA/MTMS aerogel composites (PMAC) were successfully prepared through a facile impregnation process. It finds that the PVA concentration has a great influence on the physicochemical properties of the PMAC, which has been investigated in detail. It further turns out that the density (0.081 ~ 0.152 g/cm 3 ) increases linearly along with the PVA concentration, while the thermal conductivity (32.9 ~ 51.7 mW/m/K) increases monotonously first and then keeps almost unchanged. The hydrophilicity of PMAC can be tailored by adjusting the PVA concentration. Compared with the pure MTMS aerogel and PVA, the thermal analysis reveals that the PMAC shows an improved thermal stability. Although the physical combination is verified between the MTMS aerogel and PVA, the mechanical performance of the PMAC is still significantly enhanced with the Young’s modulus and compressive strength reaching up to 20.35 MPa and 970.33 kPa, respectively. All these results suggest that the introduction of PVA into MTMS aerogel is feasible and effective for acquiring better performance for the aerogel composites, which contributes to extending their potential applications.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Zhang Shujie,Zhang Yating,Fu Lisong,Jing Mengke
The application shell uses cellulose as a green and recyclable fiber material, which has great value in the field of water treatment environment. Varying factors, including pH value, dosage of CS, reaction time and original Cr(VI) ions and Cu(II) ions were studied to investigate the Cr(VI) and Cu(II) ions removal efficiency. The obtained shell trichlorocellulose has better permeability to copper ions, which is mainly due to the different oxide states of copper ions and chromium ions in a pH environment, which lead to different combinations. The price of shell cellulose neutralization is relatively low. Metal ions have better absorption properties. The kinetic and thermodynamic characteristics of the adsorption process of copper ions by chitosan yarns were discussed. The adsorption process of copper ions conformed to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption of copper ions by the yarn is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. Compared with chromium ions, chitosan fibers have better adsorption of copper ions, which is mainly because the amino groups in chitosan fibers can have good chelation with copper ions. SEM, FTIR, XRD were used to characterize the adsorption of copper ions by chitosan fibers, and the mechanism of the adsorption of metal ions by chitosan fibers was explored.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 11
·1703-1715
·
IF 1.931
Wang Xiaolei,Sinha Tridib K.,Sun Jujie,Wang Chunfu,Kim Jin Kuk,Zong Chengzhong
The carbon–carbon double bonds (C=C) and graphene oxide (GO) in nitrile butadiene rubber (NBR) latex were reduced simultaneously by a novel one-pot to prepare the hydrogenated nitrile butadiene rubber/reduced graphene oxide (HNBR/RGO) nanocomposite in this study, using a hydrazine hydrate/hydrogen peroxide/copper sulfate catalyst. It is a water-based environmentally friendly and time-saving method where no organic solvent has served in the reduction process and hydrazine hydrate is completely consumed and will not harm the environment after the reduction process. HNBR/RGO can improve the electrical and thermal conductivity of HNBR, and the thermal conductivity of HNBR/RGO present better stability at high temperature (160 °C). RGO sheets are beneficial to shorten the curing time and increase cured rate index. And introducing RGO sheets may improve the thermal-oxidative aging resistance. The relationship between aging lifetime and temperature in HNBR/RGO can be estimated, and provide an opportunity for the practical application of HNBR. Graphic Abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 21
·26189-26201
·
IF 2.478
Zhang Xian-Hui,Liu Jun-Jun,Zha Liang-Liang,Chen Ji-Wei,Chen Bao,Wu Jian-Hua,Yu Hong-Liang
MnZn ferrites and their magnetic, electrical, and optical properties make them highly suitable in a number of applications. These ferrites are used in electronic applications, magnetic fluids, and household appliances such as washing machines, refrigerators, and microwave ovens. This paper focuses on a hydrothermal method used to prepare a bayberry spherical manganese–zinc ferrite (Mn 0.5 Zn 0.5 Fe 2 O 4 ), its surface was coated with dopamine (Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA) and then carbonized to obtain the core–shell structure C-Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA. Preliminary results show that carbon-coated manganese–zinc ferrite with saturation magnetic properties and coercivity increased from 99 emu and 66.01 Oe to 138 emu and 104.85 Oe, respectively. In addition, the carbonized Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA (C-Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA) exhibited favorable microwave absorbing performance with minimum reflection loss (RL min ) of − 17.56 dB and also revealed that the broadest effective absorption bandwidth (RL min ≤ − 10 dB) 5.36 GHz (11.70–17.06 GHz) can be achieved at 2.0 mm.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
·
IF 5.833
Wang Baichun,Liu Jianmu,Yan Yinghua,Ding Chuan-Fan,Tang Keqi
A novel type of boric acid–functionalized magnetic covalent organic framework (mCOF) with polyethyleneimine (PEI) as a linker (denoted as mCOF@PEI@B(OH) 2 ) has been prepared through a post-synthesis strategy, which points out an achievable path for the construction of boronic acid–functionalized COFs. Based on the boric acid chemistry, the obtained core-shell structured mCOF@PEI@B(OH) 2 can selectively isolate glycopeptides through the modified boronic acid groups. The mCOF@PEI@B(OH) 2 exhibits excellent performance with good reusability (ten cycles), low detection limit (0.5 fmol·μL −1 ), size-exclusion effect, and relatively high loading capacity (80 μg·mg −1 ), recovery yield (94.9 ± 2.8%), and selectivity (HRP digests:BSA digests = 1:500). Detection is done by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). In addition, 37 endogenous glycopeptides are captured from human saliva with mCOF@PEI@B(OH) 2 , providing effective proofs for its capability to capture low-abundance glycopeptides from actual biological samples. Graphical abstract
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 11
·6228-6236
·
IF 1.938
Liang Yue,Weng Ling,Zhang Wenlong
Polypropylene (PP) is considered a promising material for eco-friendly high-voltage direct current (HVDC) cable insulation. However, PP is prone to space charge accumulation under direct current (DC) electric stress, which limits its applications. In this study, 4-allyloxy-2-hydroxybenzophenone (AHB) with polar functional groups and a conjugated structure was grafted onto PP via melt grafting to improve its electrical properties. The effects of several reaction variables, specifically initiator and monomer content, reaction temperature, rotor speed, and grafting yield time were studied, and the optimal grafting conditions were determined. Evidence of grafting was examined by Fourier transform infrared (FTIR) spectroscopy. Moreover, the space charge characteristics, volume resistivity, and DC breakdown strength of the grafted PP were also studied. The FTIR results demonstrated that the AHB monomer was successfully grafted onto PP, and the maximum grafting yield obtained under the optimal grafting conditions was 0.94%. Furthermore, when the grafting yield was 0.73%, the grafted PP effectively inhibited space charge accumulation and exhibited the highest volume resistivity and DC breakdown strength. Thus, this work provides useful ideas for the design and development of environmentally friendly polymer insulating materials for HVDC applications.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-7
·
IF 5.833
Xia Chunqiu,Huang Wenying,Kang Xiutang,Chen Pingyun,You Longjie,Guo Liangqia
Mo 5 N 6 nanosheets were synthesized by a nickel-induced growth method and were found to possess peroxidase-like activity in acidic condition and catalase-like activity in weak basic condition. In acidic condition, Mo 5 N 6 nanosheets can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to form a blue color product (TMB OX ). At the co-existence of 4-aminophenol (4-AP), 4-AP can react with H 2 O 2 and TMB OX , resulting in the decrease of TMB OX and the fading of blue color. Therefore, a facile, sensitive colorimetric method for the quantitative detection of 4-AP was developed. The linear range for 4-AP was 1.0 to 80.0 μmol⋅L ‒1 ( R 2 = 0.999), and the detection limit was 0.56 μmol⋅L ‒1 based on 3 σ / k . Resorcinol, aniline, humic acid, and common ions and anions in surface water did not interfere the determination of 4-AP. This colorimetric method was applied to measure the 4-AP in real water sample from Wulong River in Fujian Province of China. The relative standard deviation for the determination of 4-AP was ranged from 0.03 to 1.88%, and the recoveries from spiked samples were ranged between 99.2 and 107.6%. The determination results were consistent with those obtained by HPLC. Graphical abstract
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 300
·期 4
·297-307
·
IF 1.931
Hu Yuning,Gong Fangling,Yan Xingran,Li Tong,Chen Jingkun,Wei Wei,Ma Guanghui
The low percentage of pores at which droplets are formed results in lower production efficiency, which is one of the main issues hampering the application of microporous membrane emulsification on a large scale. The effect of microporous membrane pore activation on the droplet’s formation and emulsion performance was systemically investigated by changing both transmembrane pressures and membrane wettability during membrane emulsification. It indicated that the high transmembrane pressure increased the pore activation ratio (the percentage of pores at which droplets are formed) by the growing flux. These induced the enhancements of emulsification efficiency and the degradation of emulsion performance. Different wettability of membrane inflow and outflow influenced the pore activation speed (the speed which droplets are formed at pores). It indicated that the wettability of membrane outflow had a key effect on droplet formation and the high pore activation speed avoided splashing for high emulsion performance.
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JOURNAL OF CLUSTER SCIENCE
·
2021
·Vol. 33
·期 6
·2661-2671
·
IF 3.061
Chen Ting-ting,Yuan Ming-ming,Tao Yu-mei,Ren Xiao-yan,Li Sufen
Chemotherapy side effects are minimized, and therapeutic results are enhanced by combination therapy, which is extensively utilized in cancer therapy. MTT experiment showed that compared to the free drugs calreticulin (CRT) and gemcitabine (GEM), GEM-CRT@NPs significantly increased the cytotoxicity of endometrial cancer (Ishikawa cells and KLE cells). These drugs were conjugated to a tri-block copolymeric framework. GEM-CRT@NPs were studied using HR-TEM and DLS analysis to determine particle size and zeta potential. Biochemical staining analyses were also used to investigate the morphological characteristics of endometrial cancer cell lines. After KLE and Ishikawa cancer cells were treated with GEM-CRT@NPs, endometrial cell shape was altered, as evidenced by nuclear fragmentation and nuclear condensation (apoptosis hallmarks). Additionally, the most significant apoptosis ratio to mitochondrial membrane potential indicates that the mitochondrial membrane potential is responsible for the cell's death. Upon treatment with GEM-CRT@NPs, systemic toxicity analysis revealed minimal histological abnormalities and significant blood chemistry alterations, and a near-normal look of the organs. Endometrial cancer treatment may be enhanced with the use of the targeted combination therapeutic system.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 27
·6813-6821
·
IF 4.157
Ma Liang,Zhu Yindi,Chen Xueming,Fang Raohao,Chen Yuru,Xu Xia,Huang Guozheng,Liu Zi,Liu Xiang
Nano-magnetite with superparamagnetism could be coated by some organic compounds or by nano Au or Pt via surface modifications with multi-step reactions for the applications of isolating histidine-tagged (His-tagged) proteins. Introducing active sites of binding histidine onto the surface of nano-magnetite was the ultimate task. However, multi-step treatments might result in departure of the coatings from the surface of the nano-magnetite, which led to loss of active sites. In this work, we reported a convenient and efficient way of treating nano-magnetites and applied them in isolating His-tagged proteins. Carboxylates were introduced on the surface of home-made nano-magnetite directly via ultrasonic mixing with sodium bitartrate rather than complicated surface modifications, which was proved by thermogravimetric analyses. Ni 2+ was, therefore, caught by the carboxylates of the coating via the coordinate interaction, demonstrated by X-ray photoelectron spectra. The coated magnetic nanoparticles with the bonded Ni 2+ were successfully employed to selectively bind and separate recombinant His-tagged proteins directly from the mixture of Escherichia coli cell lysate, and showed wonderful affinity for His-tagged proteins with the saturated adsorption amount being 556 mg g −1 . Additionally, such functionalized nano-magnetite manifested the excellent recyclability in isolating His-tagged proteins. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）