JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 3
·2239-2251
·
IF 4.626
Zhao Qian,Wang Bowen,Qin Chenyuan,Li Qiuxuan,Liu Chuntai,Shen Changyu,Wang Yaming
In this work, biodegradable poly(lactic acid) (PLA)/Ti 3 C 2 T x MXene nanocomposites were prepared through melt compounding. The roles of MXene in nonisothermal melt and cold crystallization of PLA were explored. The morphology, structure and crystallization behavior were studied using polarized optical microscopy, wide-angle X-ray diffraction and differential scanning calorimetry. For nonisothermal melt crystallization, the presence of MXene increases the crystallinity and shortens the half-crystallization time but does not change the crystallization peak temperature of PLA. For nonisothermal crystallization from the glassy state, the incorporation of MXene decreases the cold crystallization peak temperature and reduces the crystallinity marginally but does not affect the half-crystallization time of PLA. The crystallization kinetics analysis based on the Avrami equation shows that, for both the melt and cold crystallization, the crystallization mechanism is unchanged irrespective of the addition of MXene. The investigation would be useful for understanding the correlation between processing and properties of PLA/MXene nanocomposites.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 6
·979-986
·
IF 1.931
Zhang Rongli,Hu Yulong,Yuan Xingpan,Zhang Shaoqi,Zhang Cuige,Liu Huan,Huo Chaofei,Wang Hao
An electroconductive nanoparticles (NPs) film consisting of sodium poly(γ-glutamate) (γ-PGANa) and 3,4-diaminothiophene dihydrochloride (DATh) was simply prepared through macromolecular self-assembly and electropolymerization methods. Firstly, the γ-PGANa and the DATh underwent a complexation to form DATh/γ-PGANa composites through the electrostatic interaction; the DATh/γ-PGANa composites were then self-assembled into DATh/γ-PGANa NPs through decreasing the pH value in aqueous solution. Next, an electroconductive NPs film was formed on the surface of a gold electrode by casting the DATh/γ-PGANa NPs and subsequently electropolymerizing the DATh. Last, horseradish peroxidase and Nafion were cast onto the NPs film to obtain an enzymatic biosensor for H 2 O 2 detection. The electroconductive DATh/γ-PGANa NPs film endowed the biosensor with high sensitivity. Under the optimal conditions, the prepared biosensor showed a linear range from 1 × 10 −11 to 1 × 10 −4 mol·L −1 with a detection limit of 3 × 10 −12 mol·L −1 for H 2 O 2 detection. The biosensor can retain its detection performance for 4 weeks. The response currents of the biosensor changed little after adding the interferent into the analyte. The standard deviation of the response between different biosensors did not exceed 2.5%. Graphical abstract
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4812-4818
·
IF 1.938
Li Wangchang,Wang Chun,Ying Yao,Yu Jing,Zheng Jingwu,Qiao Liang,Li Juan,Che Shenglei
Soft magnetic composites (SMC) with a bionic shell structure and a delicate, regular layered arrangement were prepared via a casting process. The permeability of composite samples was 140 at 5 MHz for plane anisotropy, while that of the spherical-particle-constructed material is only 14. According to classical loss separation results, the layered bulk material without an SiO 2 coating exhibited lower hysteresis loss. In contrast, the layered bulk material coated with SiO 2 showed lower eddy current loss, attributed to the increase in resistivity resulting from the SiO 2 coating. The magnetic loss of the layered bulk materials was 588 kW/m 3 at 50 mT and 100 kHz. SMC materials with this structure are anticipated to have strong potential for magnetic cores used in high-efficiency power supplies.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 16
·4255-4265
·
IF 4.157
Li Qian,Tian Aixiang,Chen Cuiying,Jiao Tiying,Wang Ting,Zhu Shengyu,Sha Jingquan
Anderson-type polyoxometalate containing Fe 3+ and Mo 6+ , (NH 4 ) 3 [H 6 Fe(III)Mo 6 O 24 ] (FeMo 6 ), was found to work as an oxidase-mimicking nanoenzyme for the first time, exhibiting the ability of catalytic oxidation of o -phenylenediamine (OPD), 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTs), and 3,3′,5,5′-tetramethylbenzidine (TMB), which features easy synthesis, low cost, simple operation, and low consumption. Attributed to the nature of FeMo 6 and Fenton-like effect, a novel sensor based on two consecutive “turn on” fluorescence was developed for detecting dopamine (DA) by employing the FeMo 6 -OPD system, and the linear range was from 1 to 100 μ M with the detection limit 0.0227 μ M (3σ/s). Moreover, to increase oxidase-mimic activity of FeMo 6 , reduced graphene oxide (rGO) loading FeMo 6 composites (FeMo 6 @rGO (n), n = 5%, 10%, 15%) was fabricated, and results show that oxidase-like activities of FeMo 6 @rGO (n) are dependent on the mass ratio of FeMo 6 /rGO, and FeMo 6 @rGO (10%) exhibits the highest oxidase-mimic activity and the fastest respond time (4 min) among all reported oxidase mimic of DA to date.
Anderson-type Mo-POMs FeMo 6 was found to work as an oxidase-mimicking nanoenzyme for the first time and was used to detect DA for two consecutive “turn on” fluorescence sensor modes
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PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-11
·
IF 10.435
Xu Zhourui,Zhang Yinling,Zhou Weixiao,Wang Lijian,Xu Gaixia,Ma Mingze,Liu Fenghua,Wang Zan,Wang Yucheng,Kong Tiantian,Zhao Binyuan,Wu Weiping,Yang Chengbin
Photothermal therapy has attracted extensive attentions in cancer treatment due to its precise spatial-temporal controllability, minimal invasiveness, and negligible side effects. However, two major deficiencies, unsatisfactory heat conversion efficiency and limited tissue penetration depth, hugely impeded its clinical application. In this work, hollow carbon nanosphere modified with polyethylene glycol-graft-polyethylenimine (HPP) was elaborately synthesized. The synthesized HPP owns outstanding physical properties as a photothermal agent, such as uniform core-shell structure, good biocompatibility and excellent heat conversion efficiency. Upon NIR-II laser irradiation, the intracellular HPP shows excellent photothermal activity towards cancer cell killing. In addition, depending on the large internal cavity of HPP, the extended biomedical application as drug carrier was also demonstrated. In general, the synthesized HPP holds a great potential in NIR-II laser-activated cancer photothermal therapy.
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DOI
PubMed
高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·162-169
·
IF 8.897
Zhong Dazhong,Li Tan,Wang Dong,Li Lina,Wang Jiancheng,Hao Genyan,Liu Guang,Zhao Qiang,Li Jinping
Oxygen evolution reaction (OER) is crucial for hydrogen production as well as other energy storage technologies. CoFe-layered double hydroxide (CoFe-OH) has been widely considered as one of the most efficient electrocatalysts for OER in basic aqueous solution. However, it still suffers from low activity in neutral electrolyte. This paper describes partially oxidized CoFe-OH (PO-CoFe-OH) with enhanced covalency of M-O bonds and displays enhanced OER performance under mild condition. Mechanism studies reveal the suitably enhanced M-O covalency in PO-CoFe-OH shifts the OER mechanism to lattice oxygen oxidation mechanism and also promotes the rate-limiting deprotonation, providing superior OER performance. It just requires the overpotentials of 186 and 365 mV to drive the current density densities of 1 and 10 mA·cm −2 in 0.1 M KHCO 3 aqueous solution (pH = 8.3), respectively. It provides a new process for rational design of efficient catalysts for water oxidation in mild conditions.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3532-3542
·
IF 3.186
Mei Haotian,Wang Qi,Liu Guanhong,Zhu Xudong,Zhang Meng,Huang Kai,Lin Kuangfei
Nanoscale zero-valent iron (nZVI) supported on polymeric graphitic carbon nitride (CN) composite (nZVI@CN) was synthesized via liquid phase reduction method as peroxymonosulfate (PMS) activator, and had been achieved efficient degradation of paraxylene (PX) in this study. The physicochemical properties of nZVI@CN were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, Scanning electron microscopy and Brunauer–Emmett–Teller. The results indicated that catalyst prepared with 1:1 of nZVI and CN mass ration showed the best catalytic performance for the PX degradation. The removal efficiency of PX was 90.9% within 30 min treatment with the optimal reaction conditions (1 mM PMS, 0.1 g/L nZVI@CN, 20 mg/L PX and pH 6.86), and the mineralization rate measured by the removal of total organic carbon had reached 82.6%. Radical quenching and Electron paramagnetic resonance detection confirmed that sulfate and hydroxyl radicals generated by PMS activation were responsible for the degradation of PX, and sulfate radicals were the dominant active species. In addition, the possible reaction mechanism was proposed based on the experimental results. The nZVI@CN can not only be suitable for wide pH range (3–9) to effectively remove PX, but also has good stability and reusability. The removal efficiency of PX was higher than 60% in the fifth reuse experiment, which indicated that nZVI@CN was a stable PMS activator for efficiently PX removal in water. Graphic Abstract
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-9
·
IF 5.833
Xian Zhiquan,Zhang Li,Yu Ying,Lin Bixia,Wang Yumin,Guo Manli,Cao Yujuan
A nanozyme based on CoFe 2 O 4 modified with MoS 2 was constructed for colorimetric determination of cysteine (Cys) and glutathione (GSH). Firstly, ferrite CoFe 2 O 4 is synthesized, and it is then modified by MoS 2 to form a flower-like polymer (MoS 2 @CoFe 2 O 4 ). In the presence of H 2 O 2 , a redox interaction takes place, and the resulting hydroxyl promoted a colorimetric conversion from colorless to blue in the presence of 3,3′,5,5′-tetramethylbenzidine (TMB). However, once Cys or GSH is added, they are capable to compete with the interaction of the hydroxyl with TMB, resulting in an inhibition of the colorimetric conversion. The colorimetric distinction is sensitive to the amount of target. The results obtained proved that the catalytic efficiency of MoS 2 @CoFe 2 O 4 is 4.4-fold and 1.8-fold to that of MoS 2 and CoFe 2 O 4 . Meanwhile, the K m values to TMB and H 2 O 2 are 0.067 and 0.048 mM, respectively, which are 6.5-fold and 77-fold, respectively smaller than those of natural peroxidase such as HPR. This indicates that the MoS 2 @CoFe 2 O 4 possesses a favorable interaction affinity. Additionally, the colorimetric distinction caused by the competition between TMB and cysteine or glutathione is obvious. The signal responses to cysteine and glutathione are linear in the range 0.5~15 μM and 0.5~35 μM, and the LODs are 0.10 and 0.21 μM, respectively. In practical assay of Cys in serum, the RSD of the sample tests is 4.6%, and the recoveries for the spiked assays are 95.3% and 96.0% with the RSD of 2.1% and 4.2%, respectively. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·5886-5897
·
IF 2.478
Pu Linyu,Tang Jingyuan,Gu Xiaochun,Jin Tingting,Zeng Benlan,Liu Jingsong,Huang Xu
In this work, PI was chosen as polymer matrix, PI composite films embedded with BaTiO 3 were prepared by in-situ polymerization. BaTiO 3 nanofillers were modified with paraffin to form a core–shell structure in order to improve the dispersion and compatibility with PI matrix. The permittivity of paraffin@BT/PI composite films with 40 wt% filler loading increase to 8.0 (1 kHz), which is about 2.4 times higher than that of pristine PI. The composites show stable capacitance in the range of 80 to180 °C. The energy storage density of composites with 40 wt% filler loading is as high as 3.31 J cm −3 under 180 MV m −1 , which is 2.4 times higher than that of pristine PI (0.97 J cm −3 at 180 MV m −1 ). However, the charge–discharge efficiency is 29.03%, and the discharge energy density is only 0.96 J cm −3 at 180 MV m −1 . To weigh the pros and cons, the composites with 30 wt% filler loading exhibit a better energy storage property, with a η of 70.45% (180 MV m −1 ) and discharge energy density of 1.03 J cm −3 at 180 MV m −1 .
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高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 2
·1201-1216
·
IF 2.87
Yu Changjiang,Li Han,Ma Haoyue,Zhang Limei,Li Yu,Lin Qiang
A magnetic composite microsphere, calcium alginate (CA)/carboxymethyl cellulose (CMC)@MnFe 2 O 4, was prepared using CA and CMC encapsulated MnFe 2 O 4 through blending and cross-linking for the removal of Cu(II) from aqueous solution. The CA/CMC@MnFe 2 O 4 was characterized in detail by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and X-ray phosphorescence spectroscopy. In addition, various adsorption conditions including the initial pH of Cu(II) solution, equilibrium contact time, and initial Cu(II) concentration were tested. The adsorption data fit better to the Langmuir isotherm and follow the pseudo-second-order model, suggesting that it is a monolayer adsorption process with chemisorption as the rate-limiting step. The maximum adsorption capacity of the CA/CMC@MnFe 2 O 4 was 77.22 mg g −1 at 25 ℃ and pH 5. Cu(II) removal mechanisms of CA/CMC@MnFe 2 O 4 follow ion exchange as well as the formation of complexes as evidenced based on the microstructure analysis and adsorption data fitting.
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高影响因子
IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 4
·343-353
·
IF 1.899
Li Shunying,Qin Tingting,Chen Tingting,Wang Jun,Zeng Qingbing
A series of pH-sensitive semi-interpenetrating polymer network (semi-IPN) hydrogels poly(vinyl alcohol)/poly(hydroxypropyl methacrylate- co -methacrylic acid) (PVA/P(HPMA- co -MAA)) were synthesized by free-radical polymerization of HPMA and MAA in the presence of PVA. The physicochemical property of the obtained hydrogels was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analyses and scanning electron microscopy (SEM) measurements. The SEM photograph revealed the network formation with uniform pore distribution. The swelling behavior of each hydrogel in buffer solution showed a simultaneous sensitivity to pH and ionic strength: the swelling ratio of all hydrogels was higher in neutral environment than in acidic medium; besides, equilibrium swelling ratio of the hydrogels decreases as the ionic strength increases. Insulin was loaded into the PVA/P(HPMA- co -MAA) semi-IPN hydrogel. The in vitro insulin release experiment was carried out in buffer solutions at pHs 1.2 and 6.8. Results showed that the release of entrapped insulin was inhibited at pH 1.2 but obviously increased at pH 6.8. Cell viability revealed that the hydrogels were biocompatible. After oral administration of insulin-loaded hydrogel to streptozotocin-induced diabetic rats at 75 IU/kg, a sustained reduction in blood glucose level was observed. Therefore, the semi-IPN PVA/P(HPMA- co -MAA) hydrogels are potential vehicles for oral delivery of protein drugs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·5781-5789
·
IF 2.478
Han Dandan,Shen Ye,Zhao Yuan,Pan Yifan,Wei Jinhe,Wei Yen
In this work, hierarchically porous MnO/carbon (MnO/C) microsphere materials were fabricated by a facile two-step approach. The MnO precursors and the polymerization of dopamine were synthesized simultaneously by chemical solution method at room temperature. The dopamine plays a key role in the formation of MnO/C, which guides the growth of porous spherical structures and acts as a carbon source. The enhancement of electrochemical properties and electrical conductivity strongly depend on the porous structure of the composite electrodes. Benefiting from the unique structures, the optimized MnO/C electrode delivered a high specific capacitance of 378 F·g −1 at 0.1 A·g −1 and retained over 96.66% of its initial capacitance after 1000 cycles at 1 A·g −1 , suggesting that MnO/C hybrid material has promising potential for practical supercapacitors.
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高影响因子
危险品化学品经营许可证（带存储）