Polymer Chemistry
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2021
·Vol. 12
·期 18
·2722-2730
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IF 5.582
Tianai Tang,Kai Tu,Xiang Xu,Jian Xie,Duo Zhang,Zexin Zhang,Lifen Zhang,Zhenping Cheng
The design and fabrication of micron-size Janus particles (JPs) with new structures and properties are still great challenges although various methods have been used to synthesize nano-size JPs. Therefore, it is of great significance to develop a high-efficiency preparation and facile functionalization technology for micron-size JPs. Herein, we developed a facile one-pot suspension polymerization to synthesize micron-size JPs which can be easily further functionalized for the first time. The key of this method is to use an amphiphilic block copolymer prepared by atom transfer radical polymerization (ATRP) as the macromolecular surfactant (MS). On the one hand, within a certain hydrophile–lipophile balance (HLB) range, the reversed micelles in the oil phase were used to absorb water and expand, then aggregate and fuse, and finally phase separate from the oil phase to form JPs. On the other hand, the MS prepared by ATRP has an initiating group at the MS chain end, which is exposed on one side on the surface of the JPs, so that the facile functionalization of the JPs can be further realized by the ATRP strategy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zhipeng Yang,Hongqiang Li,Chengkai Li,Xuejun Lai,Xingrong Zeng
The fabrication of piezoresistive pressure sensor with self-healing function has attracted worldwide attention for its great prospects in intelligent robots, remote health monitoring and electronic skin. In this work, a conductive and self-healable elastomer (CSE) film with ridge-like microstructure was designed for flexible piezoresistive pressure sensor. Firstly, self-healable polydimethylsiloxane (PDMS)-based elastomer with ureido and imine groups was synthesized via a simple one-pot two-step polycondensation reaction with aminopropyl-terminated PDMS, isophorone diisocyanate and 1, 3, 5-triformylbenzene as monomers. Secondly, the synthesized PDMS-based elastomer solution was casted onto a sandpaper pre-sprayed with ureido pyrimidinone grafted carbon nanotubes/polyurea mixed solution, and the CSE film was obtained after drying and peeling off from the sandpaper. The piezoresistive pressure sensor fabricated with two single-electrode CSE films exhibited high sensitivity of 8.7 kPa −1 (0–6.1 kPa), low detection limit (50 Pa), fast response capability (response/relaxation time of 40/117 ms) and repeatability for 10,000 loading–unloading tests. Moreover, the sensor was able to fully recover to normal work after healing for 36 h at room temperature or even 200 s under the irradiation of near infrared (NIR) light. Importantly, the sensor was successfully applied for not only detecting human motions including radial pulse, speech recognitions and joint movements but also monitoring health status wirelessly through Bluetooth transmission. Our findings put forward a novel method to fabricate a high-performance self-healable piezoresistive sensor for wearable electronics, healthcare monitoring and electronic skin.
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Longzhu Zheng,Hongqiang Li,Xuejun Lai,Wei Huang,Zengyue Lin,Xingrong Zeng
With the increasing environmental pollution caused by oily wastewater and oil spill accidents, many superwettable materials have been prepared and applied for the separation of oil-water mixtures. However, the fabrication of superwettable materials for multifunctional water purification including oil-in-water and water-in-oil emulsion separation, dyes degradation and heavy metal ions removal still remains challenging. Herein, we propose a facile method to fabricate a superwettable Janus nylon membrane through in situ generation of silver (Ag) particles immobilized by polydopamine and asymmetric chemical modification with dodecanethiol (NDM) and l -cysteine (L-cys) on the positive and negative surfaces, respectively. The positive surface modified by NDM exhibited superhydrophobicity and superoleophilicity, and the negative surface chemically bonded with L-cys possessed opposite wettability with superhydrophilicity and underwater superoleophobicity. The positive and negative surfaces of the Janus membrane were respectively applied for the separations of water-in-oil emulsions and oil-in-water emulsions, and the separation efficiencies all reached above 99%, also demonstrating great reusability and wide adaptability. In addition, the Janus membrane presented not only outstanding performance of degrading methylene blue (MB) with high efficiency above 97.3%, but also excellent capability of absorbing heavy metal ions in the process of emulsion separation. The fabrication processes are facile, mild, and no special equipment is involved, and our findings conceivably provided a new strategy to fabricate superwettable Janus membrane for multifunctional emulsion separation and wastewater purification.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jialu Zhang,Xiangfeng Huang,Yongjiao Xiong,Weiwei Zheng,Wanqi Liu,Mengfan He,Lexue Li,Jia Liu,Lijun Lu,Kaiming Peng
Membrane separation has been acknowledged as an effective strategy to treat oily emulsions based on size-sieving. For separating nanoemulsions, smaller membrane pores are required to reject nano-sized oil droplets; however, the permeate flux would be significantly restrained. Herein, bioinspired by spider silk, a novel superhydrophilic electrospun nanofibrous membrane with spindle-knotted structures (SK-ENM) was constructed for highly efficient separation of nanoemulsions. The special spindle-knotted structures were constructed with 3–3.5 wt% polyacrylonitrile utilizing electrospinning based on Rayleigh instability. The prepared SK-ENM possessed a highly porous structure with a mean pore size of 0.634 μm, and strong superhydrophilicity/underwater superoleophobicity with rich micro/nano-hierarchical structures. For separating the surfactant-stabilized paraffin-in-water nanoemulsion with a mean droplet size of 325.7 nm, the oil rejection, permeate flux, and flux recovery rate were 95.68%, 1143.3 LMH/bar, and 99.98%, respectively. Thus, the SK-ENM with larger pores achieved both high oil rejection and high permeate flux for separating nano-sized oil droplets, which is a breakthrough achievement in overcoming the limitations of size-sieving. This could be attributed to the directional migration and coalescence of nano-sized oil droplets on spindle-knotted structures driven by Laplace force, which was calculated to be 8.7 × 10 -8 N. Meanwhile, the resulting large oil droplets were proved to be rejected by the superhydrophilic nanofibrous membrane with negligible fouling. This study provides insights into the design of novel functional superhydrophilic membranes for separation of emulsions. The as-prepared SK-ENM can be effectively applied to treating various nanoemulsions and complex oily wastewater in practical.
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CELLULOSE
·
2021
·Vol. 28
·期 11
·7373-7388
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IF 5.044
Gao Shan,Li Hongqiang,Zheng Longzhu,Huang Wei,Chen Baodeng,Lai Xuejun,Zeng Xingrong
Superhydrophobic materials with special functions of electrical conductivity, magnetism, photothermal conversion and others have been paid considerable attention in the emerging fields including wearable electronics, long-distance manipulation and seawater desalination. Herein, we report a facile approach to fabricate superhydrophobic and conductive cotton fabric (CF) for piezoresistive pressure sensor. It was based on the utilization of the reduced graphene oxide (rGO) layer on CF to form conductive pathways. Meanwhile, the in-situ generated hybrid of polydimethylsiloxane (PDMS)/titanium dioxide (TiO 2 ) on rGO layer through the hydrolysis-condensation and cross-linking reactions between dihydroxyl-terminated PDMS and tetrabutyl titanate played the role of constructing rough structure and decreasing surface energy. The fabricated PDMS/TiO 2 @rGO coated CF exhibited a high water contact angle of 159.3° and possessed outstanding self-cleaning ability. Interestingly, owing to the existence of TiO 2 , the CF also had the capability to degrade organic contaminations and the degradation rate reached 96.4% after being exposed under UV light for 90 min. In addition, the PDMS/TiO 2 @rGO coated CF with a low electrical surface resistance of 0.76 kΩ cm −1 was utilized to design and prepare a multilayer piezoresistive pressure sensor by means of the large number of air gaps between the fibers and the increase of contact points under external pressure. The sensor showed high sensitivity, fast response and good repeatability, and was successfully applied for detecting different human behaviors including pulse, voice recognition, and body motion. Our findings conceivably stand out as a new methodology to fabricate functional superhydrophobic materials and surfaces for practical applications in the fields of electronic skin, human healthcare, interactive wearable device and smart robotics. Graphic abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Peizhang Zhou,Jiang Cheng,Yuanyang Yan,Shouping Xu,Cailong Zhou
Homogeneous hydrophobic ZIF-67 decorated copper mesh was prepared by ultrafast electrodeposition and subsequent hydrophobization with stearic acid or 1-dodecanethiol. The preparation can be completed within 9 min under room temperature. Based on the hard-soft-acid-base (HSAB) theory, there exists difference of the interaction between Co 2+ and specific groups (carboxy or sulfhydryl), the oil/water separation and dyes adsorption performances were thus affected after ZIF-67-coated copper mesh was hydrophobized. The separation efficiency of the hydrophobic meshes for various oil/water mixtures was all greater than 98%, and remained almost no decline after several cycles of separation. However, the intrusion pressure of ZIF-67/copper mesh modified by 1-dodecanethiol is higher than the one modified by stearic acid. At the same time, the 1-dodecanethiol modified ZIF-67/copper mesh displayed a high adsorption capacity for Congo red (near 2000 mg/m 2 ), while the adsorption rate of the mesh modified by stearic acid is significantly faster. This work proposed a simple and fast method to build continuous, homogeneous MOFs film for oil/water separation and dyes adsorption.
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Yuanyuan Zhao,Yanqiu Zhang,Feiran Li,Yongping Bai,Yunlu Pan,Jun Ma,Sui Zhang,Lu Shao
Superhydrophilic and underwater superoleophobic (SHL&UWSOB) membranes possess unique advantages in treating oily wastewater. The hydrophilic surface coating and the hierarchical microstructure is significant for the fabrication of SHL&UWSOB membrane, however, the stability of the surface coating remain challenging. In this study, the hydrophilic hierarchical structure was first constructed based on amino-functionalized polyhedral oligosiloxane/proanthocyanidins (POSS-NH 2 /PC) surface coating. Then metal-phenol networks (MPN) was quickly derived from Fe (Ⅲ) and PC networks (FPN). The coordination complex networks formed by POSS-NH 2 /PC cross-linking and FPN synergy construct a hydrophilic hierarchical hybrid layer on poly (vinylidene fluoride) (PVDF) microfiltration (MF) membrane surface. Physicochemical characterizations demonstrate that FPN can greatly restrain the oxidation of phenolic hydroxyl group and reduce the electrostatic repulsion force and enhance the interaction between chain segments, hence, the stability of the coating in strong acidic or alkaline conditions was achieved. The synthesized membrane shows robust superhydrophilicity and underwater superoleophobicity, revealing high efficiency for separation of oil-in-water emulsion in harsh environment, and the oil rejections are over 99.0%. In addition, the resulted membrane has good anti-oil fouling performance even after three-cycles of oil/water separation. The designed membrane lights new prospects in the design of the facile and universality for other superwetting materials.
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ACS Nano
·
2021
·
IF 15.881
Fei-Fei Chen,Zi-Hao Dai,Ya-Nan Feng,Zhi-Chao Xiong,Ying-Jie Zhu,Yan Yu
Cellulose fiber (CF) paper is a low-cost, sustainable, and flexible substrate, which has gained increasing interest recently. Before practical usage, the functionalization of the pristine CF paper is indispensable to meet requirements of specific applications. Different from conventional surface modification or physical mixing methods, we report in situ growth of ultralong hydroxyapatite nanowires (HAPNWs) with lengths larger than 10 μm on the CF paper. HAPNWs are radially aligned on the surface of CFs, creating a micro/nanoscale hierarchical structure. By means of the excellent ion exchange ability of HAP and the hierarchical structure, the functions of the CF paper can be easily customized. As a proof-of-concept, we demonstrate two kinds of functional CF paper: (1) the photoluminescent CF paper by doping Eu3+ and Tb3+ ions into the crystal lattice of HAPNWs and (2) the superhydrophobic CF paper by coating poly(dimethylsiloxane) on the HAPNW hierarchical structure, which can be applied for self-cleaning and oil/water separation. It is expected that an in situ growth of ultralong HAPNWs will provide an instructive guideline for designing a CF paper with specific functions.
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PubMed
高影响因子
Stem Cells International
·
2021
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IF 5.443
Xiaoyao Huang,Zihan Li,Peisheng Liu,Meiling Wu,An-qi Liu,Chenghu Hu,Xuemei Liu,Hao Guo,Xiaoxue Yang,Xiaohe Guo,Bei Li,Xiaoning He,Kun Xuan,Yan Jin
Early orthodontic correction of skeletal malocclusion takes advantage of mechanical force to stimulate unclosed suture remodeling and to promote bone reconstruction; however, the underlying mechanisms remain largely unclear. Gli1+ cells in maxillofacial sutures have been shown to participate in maxillofacial bone development and damage repair. Nevertheless, it remains to be investigated whether these cells participate in mechanical force-induced bone remodeling during orthodontic treatment of skeletal malocclusion. In this study, rapid maxillary expansion (RME) mouse models and mechanical stretch loading cell models were established using two types of transgenic mice which are able to label Gli1+ cells, and we found that Gli1+ cells participated in mechanical force-induced osteogenesis both in vivo and in vitro. Besides, we found mechanical force-induced osteogenesis through inositol 1,4,5-trisphosphate receptor (IP3R), and we observed for the first time that inhibition of Gli1 suppressed an increase in mechanical force-induced IP3R overexpression, suggesting that Gli1+ cells participate in mechanical force-induced osteogenesis through IP3R. Taken together, this study is the first to demonstrate that Gli1+ cells in maxillofacial sutures are involved in mechanical force-induced bone formation through IP3R during orthodontic treatment of skeletal malocclusion. Furthermore, our results provide novel insights regarding the mechanism of orthodontic treatments of skeletal malocclusion.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ruilin Su,Ling Yu,Liangzhong Li,Da Chen,Hai Liu,Xiaoyun Fan,Guoqiang Liu,Ruixue Ma,Kun An,Yang Yu
Janus membrane (JM) with asymmetric surface wettability on opposite two surfaces has demonstrated high application potential on the oil/water separation process due to its unique unidirectional water permeation property. In this study, a novel Janus membrane was prepared by electrospinning a thin layer of silica nanoparticle doped poly(vinylidene fluoride- co -hexafluoropropylene) nanofibers (PVDF-HFP/SiO 2 ) on the surface of superhydrophilic polyamine (PDA) coated Cu@Cu(OH) 2 mesh. The thickness and compactness of the nanofiber layer could be controlled by varying the electrospinning time, in which the water contact angle (WCA) value of the hydrophobic layer and critical water breakthrough column height of the membrane were able to be optimized. The Janus membrane (JM-5) with the electrospinning time of 5 min exhibited a large WCA difference of approximately 140°, achieving a spontaneous water permeation from the hydrophobic to hydrophilic direction but blocking the water flow in the reverse direction. The water flux of JM-5 membrane was estimated as 5305 L/m 2. h only under the Laplace pressure. There is no obvious change in the WCA value of the JM-5 membrane observed when the membrane was employed in high saline solutions with a wide pH range of 1–13. The JM-5 membrane could maintain a stable water flux during the 6-cycle oil/water separation process. Such Janus membrane with the function of water diode could be potentially applied for the treatment of oily wastewater and other application fields, e.g., the water removal from oil-type solutions in chemical industry.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 8
·4279
·
IF 5.924
Hui Li,Xiaoxuan Yu,Fanwei Meng,Zhenyu Zhao,Shuwen Guan,Liping Wang
Ferulic acid (FA) is a naturally-occurring well-known potent antioxidant and free radical scavenger. FA supplementation is an effective strategy to delay aging, but the underlying mechanism remains unknown. In the present study, we examined the effects of FA on lifespan extension and its mechanism of FA inCaenorhabditis elegans(C. elegans). Results suggested that FA increased the lifespan ofC. elegans, rather than altering the growth ofE. coliOP50. Meanwhile, FA promoted the healthspan ofC. elegansby improving locomotion and reducing fat accumulation and polyQ aggregation. FA increased the resistance to heat and oxidative stress through reducing ROS. The upregulating of the expression of thehlh-30,skn-1, andhsf-1were involved in the FA-mediated lifespan extension. Furthermore, FA treatment had no impact on the lifespan ofdaf-2,hlh-30,skn-1, andhsf-1mutants, confirming that insulin/IGF-1 signaling pathway and multiple longevity mechanisms were associated with the longevity mechanism of FA. We further found that mitochondrial signaling pathway was modulation involved in FA-mediated lifespan extension. With the results from RNA-seq results and mutants lifespan assay. These findings contribute to our knowledge of the lifespan extension and underlying mechanism of action of FA inC. elegans.Keywords:ferulic acid;lifespan;stress resistant;insulin/IGF-1;Caenorhabditis elegans
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 19
·11266-11277
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IF 4.22
Zeng Qingtao,Ma Piming,Lai Dehui,Lai Xuejun,Zeng Xingrong,Li Hongqiang
Abstract In recent years, eco-friendly superhydrophobic materials have aroused much attention. Herein, biodegradable poly(lactic acid) (PLA) was selected as basic material to fabricate superhydrophobic foam with electrothermal effect by dip-coating graphene oxide (GO) on the surface of PLA foam constructed through freeze-drying process and the subsequent reduction with hydroiodic acid. Owing to the micro-nano rough structure of pristine PLA foam and the coverage of low-surface-energy reduced GO (rGO), the obtained rGO@PLA foam exhibited excellent water repellency with a high water contact angle of 150.6°. The foam was able to separate different oil–water mixtures, and the separation efficiencies were all above 96%. Importantly, the rGO layer also endowed the PLA foam with electrothermal conversion capability, and the surface temperature of the rGO@PLA foam rapidly increased to 129.5 °C from 30.8 °C at a low voltage of 15 V within only 120 s. By means of the generated Joule heat, the rGO@PLA foam was successfully applied for separating viscous crude oil from water, and the separation rate was about 14 times higher than that without voltage. Our findings conceivably stand out as a new tool to fabricate functional biodegradable materials for clean-up of viscous crude oil. Graphical abstract
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危险品化学品经营许可证（带存储）