JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·97-102
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IF 2.496
Shen Tieyin,Zhong Mingjun,Feng Lijuan,Sui Zhuyin,Chen Qi
Metal nanoparticles (MNPs)/metal–organic frameworks (MOFs) composites have become a research hotspot because the cooperation between MNPs and MOF can effectively improve the catalytic performance. However, development of a simple method to disperse the tiny MNPs on MOF is still a great challenge. In this work, a AuPdPt/Cu-MOF composite was prepared successfully by a one-step reduction process. First, Cu-MOF with one-dimensional nanorod structure was prepared by using surfactant PVP to control morphological growth. Second, the AuPdPt/Cu-MOF composite was synthesized by reducing the metal precursor to AuPdPt nanoparticles (NPs) supported on the surface of Cu-MOF. Encouragingly, synergistic effect between Au, Pd, and Pt, along with high dispersion of AuPdPt NPs on Cu-MOF nanorods, leading to excellent catalytic activities toward the benzyl alcohol with a conversion rate of 66%. Thus, this simple strategy to design promising MNPs/MOF composite can provide various opportunities in the field of catalysis.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·184-194
·
IF 5.693
Liang Ying,Xia Meng,Yu Qiuhan,Li Yongpeng,Sui Zhuyin,Yuan Yihui,Hu Xin-Ming,Chen Qi,Wang Ning
Uranium, which was abundant in the ocean but existed in the form of uranyl tricarbonate ([UO 2 (CO 3 ) 3 ] 4− ) with an extremely low concentration of 3.3 ppb, was a significant element of nuclear energy. It is of immediate significance to the research into uranium extraction by the exploration of adsorbents for environment and resource sustainability. Herein, the new ionic covalent organic frameworks (iCOFs) named COF-DG containing the guanidine groups was designed and synthesized via Schiff base reaction between diaminoguanidine hydrochloride and 1,3,5-triformylphloroglucinol. The adsorption performance indicated that the COF-DG possessed an uptake capacity of 65.6 mg g −1 toward the [UO 2 (CO 3 ) 3 ] 4− , attributed to the chemical interaction and anion exchange between [UO 2 (CO 3 ) 3 ] 4− and the cationic COF-DG with Cl − , as well as the electrostatic attraction. Besides, the COF-DG exhibited a higher affinity and selectivity toward [UO 2 (CO 3 ) 3 ] 4− in the presence of the competing anions. Furthermore, the COF-DG displayed an antibacterial rate of 82% against Gram-negative bacteria Escherichia coli owing to the guanidine groups. This work contributes new insights into the further development of iCOFs, for applying as a potential candidate in uranium extraction from seawater in practical engineering. Graphical abstract The new ionic covalent organic frameworks named COF-DG was designed and exploited via Schiff base reaction, which exhibited a higher affinity and selectivity toward the [UO 2 (CO 3 ) 3 ] 4− .
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 21
·5409-5417
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IF 4.157
Han Shuang,Yao Aixin,Ding Yuxin,Leng Qiuxue,Teng Fu
In this study, a novel kind of imprinted polymers based on metal–organic frameworks (MOF@DES-MIPs) was prepared, using bovine hemoglobin (BHb) as template molecules and deep eutectic solvents (DES) as functional monomers for selective recognition and adsorption of BHb. MOF were used as the substrates to improve the accessibility of imprinted sites and DES as the functional monomers to produce different forces for BHb to help the formation of imprinted sites. Imprinted polymer films were taken to provide analyte selectivity. The MOF@DES-MIPs prepared were characterized and evaluated by scanning electron microscope, X-ray diffraction, and Fourier transform infrared spectrometer. We also investigated the influences of BHb concentration and adsorption time on the performance of MOF@DES-MIPs. The maximal adsorption capacity of MOF@DES-MIPs to BHb reached 151.28 mg g −1 , and the MOF@DES-MIPs showed good selectivity and fast adsorption equilibrium, which might offer a novel method for the preparation and research of molecularly imprinted polymers of biomacromolecules. In addition, MOF@DES-MIPs were successfully applied in the selective recognition of BHb from a real bovine blood sample.
Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 14
·18591-18604
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IF 2.478
Zhang Shengsheng,Huang Fanglin,Zhong Mingqiang,Fan Ping
Dielectric material is an important material for film capacitors. However, the progress of this material is either impeded by its low dielectric constant, high loss tangent, or insufficient flexibility. In this work, PVA/GO film with alternating layer structure was fabricated by Spin-Coating-Assembly (SCA) method. This alternating layer structure not only benefits forming numerous microscale capacitors which improve ε value a lot, but also helps eliminate perpendicular contact of GO and prevents the formation of conductive pathways. Thus, compared with pure PVA, significantly increased dielectric permittivity and a low loss tangent were simultaneously observed for the PVA/GO film. The ratio of dielectric permittivity to loss tangent increased from 68 to 165. These films might be potential flexible dielectric materials for advanced electrical devices such as embedded capacitors.
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Stem Cell Research & Therapy
·
2021
·Vol. 12
·期 1
·1-16
·
IF 6.832
Zhang Xinxin,Jiang Xiaorui,Jiang Shan,Cai Xiyu,Yu Shengji,Pei Guoxian
Background Tissue-engineered bone grafts (TEBGs) that undergo vascularization and neurotization evolve into functioning bone tissue. Previously, we verified that implanting sensory nerve tracts into TEBGs promoted osteogenesis. However, the precise mechanisms and interaction between seed cells were not explored. In this study, we hypothesized that neurotization may influence the osteogenesis of TEBGs through vascularization. Methods We cultured rat Schwann cells (SCs), aortic endothelial cells (AECs), and bone marrow-derived mesenchymal stem cells (BM-MSCs) and then obtained BM-MSC-derived induced endothelial cells (IECs) and induced osteoblasts (IOBs). IECs and AECs were cultured in an SC-conditioned medium (SC-CM) to assess proliferation, migration, capillary-like tube formation, and angiogenesis, and the vascular endothelial growth factor (VEGF) levels in the supernatants were detected. We established an indirect coculture model to detect the expression of nestin and VEGF receptors in IECs and tissue inhibitor of metalloproteinase (TIMP)-2 in SCs. Then, SCs, IECs, and IOBs were labeled and loaded into a β-tricalcium phosphate scaffold to induce prevascularization, and the scaffold was implanted into a 6-mm-long defect of rat femurs. Three groups were set up according to the loaded cells: I, SCs, and IECs (coculture for 3 days) plus IOBs; II, IECs (culture for 3 days) plus IOBs; III, IOBs. Nestin and TIMP-2 expression and osteogenesis of TEBGs were evaluated at 12 weeks post-implantation through histological and radiological assessments. Results We found that SC-CM promoted IEC proliferation, migration, capillary-like tube formation, and angiogenesis, but no similar effects were observed for AECs. IECs expressed nestin extensively, while AECs barely expressed nestin, and SC-CM promoted the VEGF secretion of IECs. In the coculture model, SCs promoted nestin and VEGF receptor expression in IECs, and IECs inhibited TIMP-2 expression in SCs. The promotion of prevascularized TEBGs by SCs and IECs in group I augmented new bone formation at 6 and 12 weeks. Nestin expression was higher in group I than in the other groups, while TIMP-2 expression was lower at 12 weeks. Conclusions This study demonstrated that SCs can promote TEBG osteogenesis via IECs and further revealed the related specific characteristics of IECs, providing preliminary cytological evidence for neurotization of TEBGs.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 25
·6279-6288
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IF 4.157
Zeng Zhiyao,Tang Juan,Zhang Ming,Pu Shouzhi,Tang Dianping
Herein, a novel signal-on photoelectrochemical (PEC) biosensor with nearly zero background noise (ZBN) was first fabricated to determine the presence of organophosphorus pesticide based on in situ formation of DNA-templated Ag 2 S photoactive materials, accompanied by hybridization chain reaction (HCR) signal amplification. The capture probe (S1) on the gold nanoparticle-modified electrode can hybridize with the aptamer molecule to generate a simple PEC biosensor. In the presence of a target molecule, the aptamer molecule is released on the double-stranded DNA (dsDNA)-modified PEC biosensor. Meanwhile, the capture probe remains on the electrode and can open the DNA hairpins (H1, H2) which are rich in cytosine, to trigger the HCR reaction. The rich “C” strands are uncovered after formation of a long dsDNA polymer strand, which can assemble multiple silver ions (Ag + ) by means of by C–Ag + –C chelation. Then, a large number of Ag 2 S can be generated by challenging with S 2− solution, producing a satisfactory photocurrent signal. The photoactive material is formed in situ, which eliminates the laborious operation. Moreover, the signal can be highly amplified with nearly zero background noise and HCR signal amplification. Under optimal conditions, the ZBN aptasensor exhibited high sensitivity and selectivity, with a low detection limit of 2 pg mL −1 for malathion. Importantly, the sensing platform can also be applied to determine the presence of malathion in real samples. Graphical abstract
In this assay, a novel signal-on photoelectrochemical biosensor with nearly zero background noise was first fabricated to determine the presence of organophosphorus pesticide based on in situ formation of DNA-templated Ag 2 S photoactive materials, accompanied by hybridization chain reaction signal amplification.
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FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 12
·3510-3516
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IF 2.153
Chen Jiayi,Wang Kuang,Qi Zhenming,Wang Chunxia
BiVO 4 was prepared by Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 via a facial method. (3-acrylamide propyl) trimethyl ammonium chloride (ATAC) and allyl glycidyl ether (AGE) were reacted with 3-mercaptopropyl triethoxysilane (KH590) under ultraviolet irradiation, respectively, to prepare hydrophilic and reactive components. Then self-dispersive and reactive BiVO 4 nanoparticles were acquired after mixing hydrophilic and reactive components. Cotton fabric loaded with self-dispersive and reactive BiVO 4 was obtained by dipping-drying-curing method. BiVO 4 before and after modification was characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), zeta potential and particle size. X-ray diffraction (XRD), SEM and energy dispersive spectrum (EDS) were adopted to characterize crystal structure, surface morphology and chemical element components of cotton fabric. Ultraviolet protection and self-cleaning performance were investigated. Results showed that the dispersion stability of modified BiVO 4 was improved, and cotton fabric loaded with modified BiVO 4 possessed commendable ultraviolet protection and self-cleaning activities. The modified BiVO 4 with mole ratio of ATAC and AGE at 3:2 had the optimized dispersion stability, and the cotton fabric loaded with it featured the best ultraviolet protection and self-cleaning properties. The possible mechanism and reactions for the binding of BiVO 4 with cotton fabrics was proposed.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 4
·6237-6250
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IF 4.223
Chen Xi,Lin Hai,Dong Yingbo,Li Bing,Yin Tingting,Liu Chenjing
The complex mixtures of antibiotics and heavy metals are commonly existed in livestock and poultry breeding wastewater. Effective and simultaneous removal of these toxic compounds by microorganisms, especially single strains, remains a considerable challenge. In this study, a novel functional strain SDB4, isolated from duck manure and identified as Bacillus sp., has been shown to possess high removal capabilities for both sulfamethoxazole (SMX) and Zn 2+ . The maximum removal efficiency achieved 73.97% for SMX and 84.06% for Zn 2+ within 48 h in the single pollution system. It has great potential for eliminating SMX along with Zn 2+ , 78.45% of SMX and 52.91% of Zn 2+ were removed in the 20 mg·L -1 SMX and 100 mg·L -1 Zn 2+ binary system. Furthermore, the SMX-biotransformation capability of SDB4 was enhanced at low concentrations of Zn 2+ (below 100 mg·L -1 ). The SMX biotransformation and Zn 2+ adsorption data fitted well with the pseudo-first-order kinetic model, indicating that the two pollutants were in accordance with the same removal rule. N 4 -acetyl-SMX was identified as the main stable transformation product during SMX removal. FTIR analyses revealed that OH, NH 2 , C=O, C-N/N-H, and C-O-C played major roles in the adsorption of Zn 2+ . Our study of the dually functioning strain SDB4 provides a potential application for the simultaneous biological removal of antibiotics and heavy metals.
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JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 9
·1-12
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IF 3.097
Shi Mengqing,Yang Jin,Wang Xiwen
At present, the research hotspot of polyurethane synthesis focuses on developing bio-based materials with ecological and excellent performance. This paper synthesized a series of castor oil-modified bio-based waterborne polyurethanes (CWBPU) by adjusting the castor oil (CO) content. We used 1,5-pentamethylene diisocyanate and bio-based polyether polyols as base materials. CWBPU had the advantages of environmental protection and degradability, and the bio-based content was as high as 82%. Results showed that, with the increase of CO content from 0% to 8.97%, the tensile strength increased from 3.85 MPa to 8.86 MPa, and the elongation at break gradually decreased from 496.2% to 356.6%. The water contact angle of the films increased by about 30°, and the water absorption rate dropped from 17.44% to 7.6%. Compared with the uncoated leatherette paper, the longitudinal tear strength of the coated flush cover paper was twice that of the base paper, and the transverse tensile strength and burst resistance significantly enhanced.
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CELLULOSE
·
2021
·Vol. 28
·期 14
·9309-9321
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IF 5.044
Zhao Xiaobin,Wang Wenbo,Huang Chenghao,Luo Lei,Deng Zhongmin,Guo Wei,Xu Jie,Meng Zhenghua
Cattail is widely abounding in wetlands and marshes and is usually considered as an abundant and inexpensive biomass lignocellulose resource due to its rapid growth. In this paper, a novel cellulose (named as TOCF) separator for Li-ion batteries (LIBs) is successfully fabricated from cattail fibers by 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation and vacuum filtration. The proposed TOCF membrane shows good tensile strength (75 MPa), superior thermal dimensional stability, sufficient porosity (64.8%), outstanding liquid electrolyte uptake (323%) as well as large ionic conductivity (2.83 mS cm −1 ). Moreover, the Li/LiFePO 4 cell assembled using the TOCF separator demonstrates better discharge capacity and cycling stability than the cell with a commercial Celgard separator. Thus, the TOCF separator is a promising and low-cost candidate used in high-performance LIBs.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2021
·Vol. 247
·期 11
·2777-2785
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IF 2.998
Yang Yi,Yin Shuo,Wu Ling,Li Yongxin,Sun Chengjun
A novel ionic liquid-based air-assisted dispersive liquid–liquid microextraction combined with high-performance liquid chromatographic method was developed for the simultaneous analysis of oxytetracycline, tetracycline, demeclocycline, metacycline, chlortetracycline and doxycycline in honey. Tetracyclines in samples were extracted with ethyl acetate-[Bmim]PF 6 under acidic condition with the assistance of air. The analytes were separated on a C 18 column thermostated at 20 °C under gradient condition with a mobile phase consisted of methanol and oxalic acid. Parameters for the extraction (pH, dilution buffer, ionic strength, volumes of ionic liquid and ethyl acetate, assistance techniques and extraction time) were evaluated. The developed method showed good linearities over the range of 10.0–500 μg/L ( R 2 > 0.999). The enrichment factors were 16.6–41.2. The detection limits and quantification limits were 0.434–0.919 μg/kg and 1.45–3.06 μg/kg, respectively. The recoveries were 89.5–116%. The intra-day and inter-day RSDs were 0.644–6.44% and 2.35–15.9%, respectively. The developed method is sensitive, accurate, rapid, convenient, and is applicable for the determination of six tetracyclines in honey.
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POLYMER BULLETIN
·
2021
·Vol. 79
·期 10
·8617-8631
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IF 2.87
Wang Shihai,Zhou Yu,Tao Wangwang,Liu Jingyi,Chen Hongxiang,Zhao Zuyi
In order to obtain polyurethane micelles with targeting property and excellent stability, Fe 3 O 4 -modified magnetic amphiphilic polyurethane (MAPU) was successfully synthesized by grafting amphiphilic polyurethane to the surface of Fe 3 O 4 nanoparticles. The structure of MAPU was confirmed by Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy ( 1 H NMR), gel permeation chromatography and thermogravimetric analyzer. MAPU could form micelles with the particle size of less than 45 nm, and the micelles showed excellent stability of anti-dilution and storage, determined by dynamic light scattering. MAPU micelles had superparamagnetic property, and magnetically targeted property in HeLa cells measured by vibrating sample magnetometer (VSM) and Prussian blue staining method, respectively. Methyltetrazolium (MTT) assay experiment indicated that MAPU micelles were almost non-cytotoxic. In addition, MAPU micelles could encapsulate hydrophobic model drugs such as Indometacin (IMC) and had a release-sustained effect for IMC.
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