CHINESE JOURNAL OF POLYMER SCIENCE
·
2013
·Vol. 31
·期 2
·201-210
·
IF 1.27
Zhang Shusheng,Chen Chongyi,Li Zhibo
We investigated the ring opening polymerization (ROP) of di- and tri-ethylene glycol monomethyl ether functionalized L-glutamate N -carboxyanhydrides (NCAs) using hexamethyldisilazane (HMDS) as primary initiator and 1,5,7-triazabicyclo-[4.4.0]dec-5-ene (TBD) as co-initiator. The binary initiator system afforded a living ROP for these pegylated NCAs, and a series of homopolypeptides with controlled molecular weight (MW) and low polydispersity were obtained. We then systematically studied the helical content and clouding point (CP) dependence on polypeptide MW using circular dichroism (CD) spectroscopy and turbidity measurements, respectively. We found that the helical content of both homopolypeptides increased with MW, but the triethylene glycol functionalized poly-L-glutamate (poly-L-EG 3 Glu) intended to form more stable α -helical structure than diethylene glycol functionalized counterpart (poly-L-EG 2 Glu) at similar MW. Accordingly, the CP of poly-L-EG 2 Glu with known end group has strong dependence on its helical content, which is essentially determined by MW. Our results suggested that the thermal responsive properties of these unique pegylated poly-L-glutamates not only rely on their chemical structure but also on their secondary structures, which is different from conventional thermal responsive polymers.
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2020
·Vol. 50
·期 5
·621-630
·
IF 2.384
Wang Yuyang,Zheng Hongtao,Lin Cunguo,Zheng Jiyong,Chen Ye,Wen Qing,Wang Shuang,Xu Haitao,Qi Lijuan
The structure and biocompatibility of anode materials significantly affect the performance of microbial fuel cells (MFCs). A biocompatible polyaniline–sodium alginate (PANI–SA) composite was prepared in situ oxidation polymerization on the 3D porous nitrogen-doped carbon nanotube/sponge (NCNT/S) to construct a high-performance microbial fuel cell in this investigation. The SEM showed that PANI–SA composite anode had a three-dimensional macroporous structure, and nitrogen-doped nanotubes were wound around the sponge skeleton, which had a large specific surface area, provided more places for the attachment and growth of microorganisms. A dual-chamber MFC equipped with a PANI–SA/NCNT/S bioanode to achieve a power density of 4380 mW m −3 , which was much greater than the other MFCs. During the charge–discharge time of 60–90 min, the PANI–SA/NCNT/S bioanode had the highest total charge value of 26,617.86 C m −2 , which was 3.23 times higher than that of NCNT/S (8231.87 C m −2 ). High-throughput sequencing results showed that the PANI–SA/NCNT/S bioanode exhibited high community diversity and selective enrichment of electrogenic bacteria. The excellent performance of the MFC equipped with PANI–SA/NCNT/S anode was attributed to the composite materials, which could be attributed to the large-pore network structure, better biocompatibility, large capacitance and high specific surface area. Graphic abstract
Illustration of the process for the preparation of PANI–SA
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 47
·期 9
·11793-11805
·
IF 2.807
Lan Lefang,Lu Xiaobin,Zheng Yancheng,Zhang Guoqing,Cheng Zhe
Cationic Gemini surfactants which were synthesized from long carbon chain alkyl tertiary amines and 1,3-dibromopropane, and polyether ammoniums as clay stabilizers which were synthesized by the reaction of polyether ammine (D230) with formic acid and hydrochloric acid, named as D230FA and D230HC, respectively, were used to preclude hydration expansion and migration of clay minerals in low permeability oilfields, hence facilitating the water injection and oil recovery from the tight reservoirs. The surface tension and interfacial tension (IFT) of surfactants, anti-swelling property of clay stabilizers and the injection performance of the composite system were evaluated in this study. The experimental results show that C14-3-C14 has high interfacial activity and solubility, and the composite system of C14-3-C14 and polyether ammonium salt has good clay stability. The anti swelling rate of Na-clay treated by the solution of 1.5% KCl + 0.1% C14-3-C14 after 10 times of washing with distilled water decreased from 72.6% to 28.0%. While 1% D230FA and 1% D230HC mixed with 0.1% C14-3-C14 + 0.5% KCl have the initially anti swelling rates of 72.1% and 68.3%, and the anti swelling rates after flushing with distilled water reach 61.2% and 58.3%, respectively, indicating good anti-swelling durability . Core flooding experiments show that the injection performance of the composite system depends on the contact angle ( θ ) and the surface tension ( γ ), and the composite system contained 1% D230HC with lower value of γ cos θ has better injection performance than that of 1% D230FA. XRD analysis shows the lower interlayer spacing of clay minerals treated with clay stabilizer solution containing polyether ammonium salts.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 12
·3533-3541
·
IF 2.482
Peng Shengnan,Jiang Yunhong,Wang Zeming,Luo Xudong,Lu Jinlin,Han Lu,Ding Yanhuai
Abstract CdS nano-photocatalysts hold a great promise for the photocatalytic hydrogen evolution; however, their practical application is greatly hampered by poor activity and stability due to the recombination of the photogenerated charge carriers and photocorrosion phenomena. Herein, we report a novel 3-dimensional CdS@UiO-66 nanostructures obtained by a facile solvent-free approach; with a step-by-step procedure, the core/shell configuration provided a suitable unit in size to easily equip defect-rich MoS 2 nanosheets. The UiO-66 Zr-MOFs used as a porous container to promote the dispersion of CdS nanoparticles, resulting to the increasement of active sites for photocatalytic reaction. The further enhanced photocatalytic activity for MoS 2 hybrid CdS@UiO-66 originated from the manufactured defect on the exposed edges of MoS 2 nanosheets, which was produced by adjusting the S/Mo ratio. UiO-66 did not only provide extensive migration routes over photogenerated electrons, more importantly, it created ample time and sites for accelerating consumption of the isolated photogenerated holes with sacrificial agent, resulting in alleviating photocorrosion reaction. The photocatalytic efficiency and photostability were simultaneously promoted. This work highlights the potential application of core/shell configuration in photocatalytic hydrogen evolution. Graphic Abstract
CdS@UiO-66 type composite photocatalyst was obtained in the condition of
solvent-free assembling at room temperature. The defect-rich MoS 2 nanosheets were
felicitously equipped on the core/shell configuration. The obtained defect MoS 2 hybrid CdS@UiO-66 composite material exhibits a high and stable hydrogen production rate
due to their synergistic effect.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 6
·584-592
·
IF 3.815
Xiao Yang,He Chong,Yang Zi-Fan,Chen Er-Qiang,Lu Huan-Jun,Li Xiao-Hong,Tu Ying-Feng
We demonstrate here a novel method for the design of liquid crystals (LCs) via the cyclization of mesogens by flexible chains. For two azobenzene-4,4′-dicarboxylate derivatives, the cyclic dimer, cyclic bis(tetraethylene glycol azobenzene-4,4′-dicarboxylate) (CBTAD), shows LC properties with smectic A phase, while its linear counterpart, bis(2-(2′-hydroxyethyloxy)ethyl azobenzene-4,4′-dicarboxylate (BHAD), has no LC phase. The difference is ascribed to the shackling effect from the cyclic topology, which leads to the much smaller entropy change during phase transitions and increases the isotropic temperature greatly for cyclics. In addition, the trans -to- cis isomerization of azobenzene groups under UV-light is also limited in CBTAD. With the reversible isomerization of azobenzene groups, CBTAD showed interesting isothermal phase transition behaviors, where the LC phase disappeared upon photoirradiation of 365 nm UV-light, and recovered when the UV-light was off. Combined with the smectic LC nature, a novel UV-light tuned visible light regulator was designed, by simply placing CBTAD in two glass plates. The scattered phase of smectic LC was utilized as the “OFF” state for light passage, while the UV-light induced isotropic phase was utilized as the “ON” state. The shackling effect outlined here should be applicable for the design of cyclic LC oligomers/polymers with special properties.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 19
·23728-23736
·
IF 2.478
Hu Li-Bin,Huang Xin-Yu,Zhang Shan,Chen Xue,Dong Xian-Hui,Jin He,Jiang Zhen-Yu,Gong Xiao-Ran,Xie Yi-Xuan,Li Chen,Chi Zong-Tao,Xie Wan-Feng
Morphology transformation and crystal growth strategies of metal oxide semiconductors are still extensively studied in material science recently, because the morphology and crystallinity significantly affect the physicochemical characteristics of metal oxide nanomaterials. However, understanding the morphology changes of α -MoO 3 induced by annealing is still a challenge. Herein, the nanostructure transition of α -MoO 3 induced by the annealing temperature is carefully investigated via the XRD and SEM methods. It can be found that crystallization is highly dependent on the annealing temperature. Interestingly, the MoO 3 nanoflowers can change into nanosheets at 500 °C. Afterward, the nanosheets turned into microrods with the increase in annealing temperature due to the continuous growth of MoO 3 crystal. On the other hand, the sensing performances of various MoO 3 nanostructures are studied toward ethanol gas. Compared to the MoO 3 nanoflowers and microrods, the MoO 3 nanosheets-based sensor exhibits superior sensing performance to ethanol, and the maximum response value is 8.06.
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Collagen and Leather
·
2024
·Vol. 6
·期 1
·1-12
·
IF 0
Wei Wenyu,He Manman,Ma Jianrui,He Huixia,Liu Peng,Xiao Jianxi
Proteases, such as trypsin, are essential for extracting collagen in various industrial applications. The potential applications of rare earth nanomaterials, specifically yttrium nanoparticles, have attracted significant interest across various fields due to their distinctive characteristics, including high dielectric constant and thermal stability. Biomineralization has emerged as a promising approach to synthesize protein-inorganic nanomaterials with hierarchical structures and desired functions. In the present investigation, a novel protease-templated biomineralization strategy was developed for synthesizing protease-(NH 4 ) 2 Y 3 F 11 •H 2 O hybrid nanomaterials using a one-pot method under very mild conditions. For modifying the morphologies of (NH 4 ) 2 Y 3 F 11 •H 2 O throughout biomineralization, protease has been demonstrated to be a highly promising biotemplate. Protease was utilized as a template for morphological control in the biomineralization procedure, which resulted in a gradual transformation of the initially formed (NH 4 ) 2 Y 3 F 11 •H 2 O octahedral structures into uniform nanospheres. The applicability of this approach was supported by successfully utilizing various proteases to synthesize protease-(NH 4 ) 2 Y 3 F 11 •H 2 O hybrid nanospheres. In addition to a strong and desirable luminescent signal, these hybrid nanospheres demonstrated extensive recycling because of their high enzymatic activity, stability and durability. The protease-mediated biomineralization approach offers an easy and robust approach to develop innovative protease-inorganic composites. Its moderate reaction conditions and simple operation render it a viable tool for developing stable and reusable enzyme reactors in various industrial applications. Graphical Abstract
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Systems Microbiology and Biomanufacturing
·
2023
·
IF 0
Sun Tingting,Liu Di,Zhang Linmeng,Fan Taiping,Cai Yujie
(2R,3R)-BDO is an important bio-based four-carbon platform compound and widely used in chemical, food, pharmaceutical, fuel and aerospace fields . Serratia marcescens has been shown to be an effective strain for producing BDO. However, there have been few reports on the metabolic engineering of this strain to efficiently produce (2R,3R)-BDO using xylose. In this study, the endogenous strong promoter was screened and modified, and combined with the screened RBS. (2R,3R)-BDO was successfully produced by combining the selected promoters and RBS with the overexpressed key enzymes (ALS, ALSD, BDH, GLF) of (2R,3R)-BDO production. The optimum fermentation temperature and pH were 37 ℃ and 6.0, respectively, and the optimized yield reached 6.0 g/L. After batch fermentation, the (2R,3R)-BDO yield reached 36.6 g/L. This provided a good idea for efficient production of (2R,3R)-BDO from xylose.
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Systems Microbiology and Biomanufacturing
·
2024
·
IF 0
Huang Yu,Li Hedan,Zhao Guihong,Hu Xiaoqing,Wang Xiaoyuan
The production of L-alanine was enhanced in Corynebacterium glutamicum ATCC13869 through metabolic engineering of the biosynthesis pathways of L-alanine and fatty acids. Strains Δ fasB , Δ fasBR , Δ fasB Δ pks13 and Δ fasBR Δ pks13 were constructed and exhibited increased L-alanine yields up to 17.29 g/L. Different from Δ fasB mutant constructed from C. glutamicum ATCC13032 in which L-glutamate production accumulated, the muatnt Δ fasB constructed from C. glutamicum ATCC13869 in this study significantly produce L-alanine without L-glutamate accumulation. Transcriptional level analysis revealed that the knockout of fasB upregulated the expression levels of the genes related to L-alanine synthesis but downregulated those associated with fatty acid synthesis, confirming the redirection of metabolic flux from fatty acid synthesis to L-alanine synthesis in these strains. L-alanine productions were further enhanced in strains Δ fasB and Δ fasBR through the combinatorial expression of heterologous genes Bacillus subtilis alaD encoding alanine dehydrogenase and Escherichia coli alaE encoding alanine export protein, and the yields reached 55.21 g/L and 54.95 g/L, respectively. Finally, 69.9 g/L L-alanine was obtained in Δ fasB /pJYW-5- alaDE after 60 h of fermentation by supplementing glucose. Our data indicate that disrupting the fatty acid biosynthesis could redirect metabolic flux towards L-alanine biosynthesis. These results provide a new strategy for increasing the production of L-alanine in C. glutamicum . Graphical Abstract
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Systems Microbiology and Biomanufacturing
·
2022
·Vol. 2
·期 4
·634-642
·
IF 0
Zhou Hengrui,Gao Song,Zeng Weizhu,Deng Zhenshan,Zhou Jingwen
Citrinin is a common mycotoxin produced by different fungi. Although considerable endeavors have been made to increase citrinin output to meet the requirements of research and industrial needs, few methods are effective, owing to potential safety concerns and technical limitations. In this study, a blue fungus that produces a yellow pigment was isolated from Ziziphus jujuba . The strain was then identified as Penicillium citrinum and named HR-087. Preparative liquid chromatography was used to extract the yellow pigment. Both LC–MS and NMR assays showed that it was citrinin. To enhance the citrinin production of this strain, the culture medium was optimized through orthogonal experiments, as well as batch and fed-batch process. The final titer and productivity of citrinin reached 9.62 g/L and 0.1 g/(L × h), respectively. The high titer achieved indicates the possibility of large-scale production of high purity citrinin for low-cost supply for both academic and diagnostic analysis standard.
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Collagen and Leather
·
2023
·Vol. 5
·期 1
·1-13
·
IF 0
Dong Jinhong,Wang Tianyou,Li Haotian,Zhang Jianhua,Zhang Hengjie,Liu Weijie,You Xinru,Gu Zhipeng,Li Yiwen,Chen Xianchun,Fu Qiang
The development of advanced sustainable biomedical materials with superior biosafety and bioactivity for clinical applications is highly desirable. In the present investigation, biomass-based nanoparticles (NPs) were assembled through the Mannich reaction between the plant polyphenols and the broad-spectrum antibiotic tigecycline (TG). The fabricated NPs with uniform size demonstrated excellent oxidative balance effects, pH-responsive release properties and antibacterial performances. Furthermore, the intracellular and in vivo studies confirmed that the NPs are capable of reducing oxidative damage to cells and significantly repairing tissue injury in mice with peritonitis. This work presents an effective method and idea for constructing biomass-based materials for the treatment of infection-induced diseases. Graphical Abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Jin Chengbin,Huang Yiyu,Li Lanhang,Wei Guoying,Li Hongyan,Shang Qiyao,Ju Zhijin,Lu Gongxun,Zheng Jiale,Sheng Ouwei,Tao Xinyong
Reactive negative electrodes like lithium (Li) suffer serious chemical and electrochemical corrosion by electrolytes during battery storage and operation, resulting in rapidly deteriorated cyclability and short lifespans of batteries. Li corrosion supposedly relates to the features of solid-electrolyte-interphase (SEI). Herein, we quantitatively monitor the Li corrosion and SEI progression (e.g., dissolution, reformation) in typical electrolytes through devised electrochemical tools and cryo-electron microscopy. The continuous Li corrosion is validated to be positively correlated with SEI dissolution. More importantly, an anti-corrosion and interface-stabilizing artificial passivation layer comprising low-solubility polymer and metal fluoride is designed. Prolonged operations of Li symmetric cells and Li | |LiFePO 4 cells with reduced Li corrosion by ~74% are achieved (0.66 versus 2.5 μAh h −1 ). The success can further be extended to ampere-hour-scale pouch cells. This work uncovers the SEI dissolution and its correlation with Li corrosion, enabling the durable operation of Li metal batteries by reducing the Li loss.
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