JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 2
·
IF 1.866
Zhi Chen,Ting Wang,Xiufeng Yan
Current cyclodextrin (CD) hydrogels have disadvantages, including a limited CD content, long reaction time, and complicated chemical reactions. To overcome these, a one-pot reaction was adopted, and a concept of a β-CD hydrogel cage was proposed. Hydroxyethyl cellulose (HEC) was used as the raw material with the adjustment of the stoichiometric relationship among the crosslinking agent of epichlorohydrin, alkali environment, and β-CD amount, and an elastic β-CD hydrogel cage system was established. After the β-CD was caged, the contents of active β-CD in hydrogel products reached 74.45 and 69.14 wt % by weight measurement and photometric titration, respectively. Furthermore, compared to the pure HEC hydrogel, the hydrogel mechanical strength improved obviously after the β-CD was caged, and we obtained a faster water swelling rate at the same time. Finally, a hydrophobic molecule of phenolphthalein (PP) was used to evaluated the activity of caged β-CD in the hydrogel. In addition, the absorption and release of PP by an elastic β-CD hydrogel cage at certain time intervals were also studied. The results demonstrate that the β-CD hydrogel cage was used as a functional molecule carrier to quickly absorb and sustain the release of PP. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44388.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 31
·16289-16295
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IF 8.867
Jing-Jing Wang,Hao-Cheng Yang,Ming-Bang Wu,Xi Zhang,Zhi-Kang Xu
Nanofiltration membranes are of great interest in brackish water desalination and drinking water purification. Improving the permeation and separation performance remains a big challenge in advanced nanofiltration membranes. Herein, we report triple-layered composite nanofiltration membranes constructed by the interfacial polymerization of diamine and acyl chloride on a cellulose nanocrystal interlayer supported by a microporous substrate. The cellulose nano-crystal interlayer plays a crucial role in the polyamide skin layer formation and the following nanofiltration process. It can store aqueous diamine monomers and slow down the interfacial polymerization for a relatively low cross-linking degree of the skin layer. This hydrophilic interlayer also facilitates water permeation through a “dragging effect”. The constructed membranes exhibit an ultra-high permeation flux up to 204 L m−2 h−1 under 0.6 MPa with a Na2SO4 rejection above 97%, which is the highest reported result to our knowledge. The ultra-high water permeation flux enables nanofiltration at low operating pressure, making it an energy-saving process. Moreover, the low cross-linking degree of the skin layer results in a high monovalent/divalent ion separation ratio.
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MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Tara Larsson,Ting Shuai Li,Min Xu,Ida Fransson,Guangsen Yu,Martin Andersson,Baihai Li,Bengt Sunden
In this study, we co-fabricated the Ni-based nanofibers using an electrospinning technique. The effects of viscosity, applied voltage and distance from needle to the collection plate on the fiber morphology were investigated. The fibers were sintered at temperatures ranging from 350 °C to 1200 °C and the results indicated that the crystallization was completed at 800 °C and the particle size increased with the temperature. The porosity of nanostructure can reach over 50% before reduction of the nickel oxide, which increased firstly with the temperature and then decreased over 800 °C. The nanocrystallization of an anode was helpful to maximize the electrochemical reaction sites for restraining the activation polarization and also to enlarge pores for rapid gas diffusion in fuel cells.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 41
·9651-9655
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IF 5.066
Wei Xu,Feiming Li,Zhixiong Cai,Yiru Wang,Feng Luo,Xi Chen
An organic–inorganic hybrid fluorescent perovskite, CH3NH3PbBr3, was synthesized by a grinding method, and applied for humidity sensing. Its strong fluorescence at 530 nm could be linearly quenched by a humidity increase from 7 to 98%. Coupled with a red-emitting reference dye, 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin, a colorimetric humidity sensor was produced using the perovskite. The sensor appeared to be sensitive to increased humidity by displaying a color change from green to red, or vice versa, with good reversibility. The proposed approach should provide a new strategy in the design of sensitive and applicable humidity sensors.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaofei You,Siwei Yang,Jipeng Li,Yuan Deng,Lianqi Dai,Xiong Peng,Haoguang Huang,Jing Sun,Gang Wang,Peng He,Guqiao Ding,Xiaoming Xie
Scalable fabrication of water-dispersible graphene (W-Gr) is highly desirable yet technically challenging for most practical applications of graphene. Herein, a green and mild oxidation strategy to prepare bulk W-Gr (dispersion, slurry, and powder) with high yield was proposed by fully exploiting structure defects of thermally reduced graphene oxide (TRGO) and oxidizing radicals generated from hydrogen peroxide (H2O2). Owing to the increased carboxyl group from the mild oxidation process, the obtained W-Gr can be redispersed in low-boiling solvents with a reasonable concentration. Benefiting from the modified surface chemistry, macroscopic samples processed from the W-Gr show good hydrophilicity (water contact angle of 55.7°) and excellent biocompatibility, which is expected to be an alternative biomaterial for bone, vessel, and skin regeneration. In addition, the green and mild oxidation strategy is also proven to be effective for dispersing other carbon nanomaterials in a water system.
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CHEMICAL COMMUNICATIONS
·
2016
·Vol. 52
·期 75
·11274-11276
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IF 6.567
Jin Han,Maowen Xu,Yubin Niu,Guan-Nan Li,Minqiang Wang,Yan Zhang,Min Jia,Chang ming Li
Novel K2Ti8O17 is successfully fabricated via a facile hydrothermal method combined with a subsequent annealing treatment and further evaluated as an anode material for potassium-ion batteries for the first time. This study may provide a broader vision into developing anode materials for potassium-ion batteries.
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Nanoscale
·
2025
·Vol. 17
·期 8
·4676-4686
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IF 5.1
Bingying Chen,Junli Guo,Chen Chen,Yueling Shen,Yaoyao Yang,DengGuang Yu
Thermoplastic polyurethane (TPU) fabrics often possess good mechanical, waterproofing, and breathability properties. However, the resistance of TPU to excessive ultraviolet (UV) irradiation is poor and often does not meet the UV resistance requirements of fabrics. Electrospun nanofibers with a side-by-side structure can combine the advantages of different materials. Therefore, in this study, a series of Janus composite nanofiber membranes with side-by-side structures were prepared by eccentric electrospinning using polyacrylonitrile (PAN), titanium dioxide (TiO2), and TPU as raw materials. The Janus structure of the nanofibers was evident in scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. Wettability and breathability tests showed that the nanofiber membranes exhibited waterproofing and breathability properties. The Janus composite nanofiber membrane with 1 wt% titanium dioxide TiO2 exhibited a UV-protection factor (UPF) as high as 1962 and a UV transmittance of less than 2.5%, with the amount of TiO2 added being proportional to the UV resistance. Additionally, the UV resistance of the nanofiber membranes did not decrease substantially after seven days of immersion in solutions at different pH values. Finally, this study analyzed the mechanism by which the Janus structure enhanced the UV resistance. The UV light was reflected, refracted, and absorbed many times on the crescent side with excellent UV-absorption performance, which greatly improved the UV resistance of the membrane.
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Soft Matter
·
2024
·Vol. 20
·期 22
·4402-4413
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IF 2.9
Xinglinmao Li,Wen Li,Jia Cheng,Xiao Sun,Yue Zhang,Chunping Xiang,Shougang Chen
Determining the fatigue threshold of elastomers is particularly important to predict their durability and lifespan. However, there has been almost no effective approach to calculate this threshold fast and accurately so far. To realize rapid fatigue performance testing, in this paper, a new method is proposed to calculate the fatigue threshold through the elastic limit strain point of elastomers that can be obtained from the continuous Mullins test. Compared with the traditional binary method to predict fatigue threshold, this method significantly reduces the time required for fatigue testing of elastomers, which can save approximately 2–3 sampling points in the fatigue test, i.e. a time savings of around 40%. Our method also proved to be effective for the elastomers at 0 °C. Additionally, a dual-network elastomer was synthesized using the interpenetrating network method, exhibiting improved elasticity (2.1 MPa and 3.1 MPa), toughness (1423 J m−2 and 2100 J m−2), and higher fatigue threshold (125 J m−2 and 385 J m−2) at 0 °C and room temperature. This material presents great application potential in marine anti-fouling.
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MATERIALS LETTERS
·
2024
·
IF 2.7
Ke Su,Qianzai Zhou,Yingchun He,Sijia Yu,Haijun Yang
Ammonium nitrate (AN) is an important explosive that is widely used in military and civilian fields. However, the high hygroscopicity of AN limit its wider applications and developments. In this study, AN were coated with Co8HQ complexes via solid–solid method, giving a series of surface modified AN/Co8HQs. AN and AN/Co8HQs were characterized by XRD, FTIR, SEM, and EDS. The water contact angles of AN/Co8HQs are higher than that of AN. Hygroscopicity experiments show that the hygroscopicity of AN/Co8HQs was reduced over 40 % at all tested relative humidities in 24 h. The AN/1.5 %Co8HQ showed a 70 % hygroscopicity drop in 24 h at 97.3 % RH. Micrographs of AN/Co8HQ show that Co8HQ were uniformly coated on the surface of AN and filled the voids of AN. Generally, a straightforward and scalable method is provided to improve the anti-hygroscopic properties of AN, which has a considerable potential for practical applications. This gives AN/Co8HQ a very good anti-hygroscopic property.
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Photonics Research
·
2024
·Vol. 12
·期 7
·1542-1547
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IF 6.6
Zhibo Hou,Zhibo Hou,Liao Chen,Liao Chen,Rongwu Liu,Rongwu Liu,Chi Zhang,Chi Zhang,Xiaojun Wu,Xiaojun Wu,Xinliang Zhang,Xinliang Zhang,Xinliang Zhang
The terahertz (THz) absorption spectrum is a powerful method to identify substances. The improvement focuses on sensitivity and recovery ability. Here, we demonstrate enhanced THz vibrational absorption spectroscopy based on an on-chip THz whispering gallery mode resonator (THz-WGMR). A THz-WGMR with high Q can store energy and enhance the interaction between the THz waves and the target substances to capture the unique absorption fingerprint information. Therefore, it possesses significant sensitivity to identify trace amounts of substances. As a proof of concept, lactose powder and glucose powder are applied to demonstrate the effectiveness of our approach in recovering fingerprint absorption spectroscopy. Compared with a straight waveguide, the high sensitivity of the THz-WGMR is illustrated. The change of the transmissivity caused by the lactose reaches 7.8 dB around 532 GHz for the THz-WGMR, while only 1.4 dB for the straight waveguide, demonstrating the state-of-the-art sensing performance in fingerprint absorption recovery. We believe the proposed integrated THz-WGMR will promote the THz identification of tiny fingerprint substances.
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RSC Advances
·
2017
·Vol. 7
·期 63
·39611-39616
·
IF 3.108
Lei Yu,Ping Zhang,Hongxiu Dai,Ling Chen,Houyi Ma,Meng Lin,Dazhong Shen
In this work, Co3O4 nanosheets were fabricated on indium tin oxide (ITO) substrates by developing a simple electrochemical deposition and annealing method. The as-prepared Co3O4 nanosheets were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), attenuated total reflection infrared (ATR-IR) spectroscopy and Raman spectroscopy. The Co3O4 nanosheets modified ITO electrode was used for the electrochemical analysis of various trace lead ions by differential pulse anodic stripping voltammetry. The electrode was found to be highly selective to Pb(II) in the range of 1–100 μg L−1, and exhibited a sensitive current response with a limit of detection (LOD) of 0.52 μg L−1. Furthermore, the developed electrochemical Pb(II) sensor exhibited a high stability and reproducibility with a simple regeneration process.
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ACS Synthetic Biology
·
2024
·
IF 3.7
Jiao Feng,Runyuan Jin,Shasha Cheng,Hui Li,Xin Wang,Kequan Chen
In this study, we designed an artificial pathway composed of tyramine β-hydroxylase (TBH) and phenylethanolamine N-methyltransferase (PNMT) for the biosynthesis of both octopamine and synephrine. As most TBH and PNMT originate from eukaryotic animals and plants, the heterologous expression and identification of functional TBH and PNMT are critical for establishing the pathway in mode microorganisms like Escherichia coli. Here, three TBHs were evaluated, and only TBH from Drosophila melanogaster was successfully expressed in the soluble form in E. coli. Its expression was promoted by evaluating the effects of different expression strategies. The specific enzyme activity of TBH was optimized up to 229.50 U·g–1, and the first step in the biosynthetic pathway was successfully established and converted tyramine to synthesize 0.10 g/L of octopamine. Furthermore, the second step to produce synephrine from octopamine was developed by screening PNMT, enhancing enzyme activity, and optimizing reaction conditions, with a maximum synephrine production of 2.02 g/L. Finally, based on the optimization of the reaction conditions for each individual reaction, the one-pot cascade reaction for synthesizing synephrine from tyramine was constructed by combining the TBH and PNMT. The synthetic synephrine reached 30.05 mg/L with tyramine as substrate in the two-step enzyme cascade system. With further optimization and amplification, the titers of octopamine and synephrine were increased to 0.45 and 0.20 g/L, respectively, with tyramine as substrate. This work was the first achievement of the biosynthesis of octopamine and synephrine to date.
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