CELLULOSE
·
2021
·Vol. 29
·期 1
·341-354
·
IF 5.044
Wang Huiqiang,Yu Xin,Tang Xing,Sun Yong,Zeng Xianhai,Lin Lu
The flexible hydrogel sensors in the field of artificial intelligence have been widely concerned, which could be applied in medical monitoring, human motion detection, and intelligent robots. However, the integration of the synergistic properties of excellent mechanical properties, temperature sensitivity, adhesion ability and self-healing ability for preparation of hydrogel-type strain sensor is still a challenge. Moreover, how can we recover cumulated sensors without affecting the environment? Herein, a self-healing hydrogel was prepared based on deep eutectic solvent (DES) combined with polyvinyl alcohol (PVA), and cellulose nanocrystals (CNCs), which has the peotential application as wearable strain sensors. The DES network crosslinks PVA/CMC-Na/CNCs through ionic bonds, and the overall network is further linked through physical entanglement and hydrogen bonding interactions. Interestingly, the hydrogel could sensitively detect large or subtle movements (such as finger bending, wrist bending, knee bending, pulse and pronounce), indicating its potential applications in human–computer interaction and personal health monitoring. Graphical abstract
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APPLIED COMPOSITE MATERIALS
·
2021
·Vol. 29
·期 2
·745-764
·
IF 2.181
Zhang Meng,Qian Xin,Ma Kai,Ma Hongbo,Zhang Yonggang
A two-step surface treatment was conducted on high strength and high modulus carbon fibers (HSHM-CFs) to enhance the interfacial properties of polyetherketoneketone (PEKK) matrix composites. In the two-step surface treatment, the surfaces of HSHM-CFs were electrochemically oxidized followed by sizing treatment. Thermoset epoxy (EP) sizing agents and thermoplastic polyetherimide (PEI) sizing agents were utilized for comparison. Results showed that PEI sizing agents had better wetting effects than EP sizing agents. The sizing process led to increases in fiber strength due to healed surface flaws and inhibited micro-crack initiation. Although EP sizing agents were incompatible with PEKK matrix, the interlaminar shear strength (ILSS) of PEKK matrix composites reinforced by EP-sized fibers still increased, compared with that by untreated fibers, due to hydrogen bond and weak chemical reactions between HSHM-CFs and PEKK matrix. The strong interaction between PEI sizing agents and HSHM-CFs, diffusion and entanglement as well as the non-covalent π-π interaction between PEI sizing agents and PEKK matrix resulted in highest ILSS value of PEI-sized HSHM-CF/PEKK composites.
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-15
·
IF 16.419
Xu Jie,Cui Jian,Yang Shaomin,Han Yu,Guo Xi,Che Yuhang,Xu Dongfang,Duan Chenyang,Zhao Wenjing,Guo Kunpeng,Ma Wanli,Xu Baomin,Yao Jianxi,Liu Zhike,Liu Shengzhong
A series of 10 imidazolium-based ionic liquids (IILs) with different cations and anions have applied to unravel the passivation mechanism of the IILs on CsPbI 2 Br inorganic perovskites.
It is found that anions of IILs play a more important role in passivation of lead- and cesium-related defects in inorganic perovskite compared with imidazole cations because they can form strong ionic interactions (Pb-F, Cs-F).
A high-power conversion efficiency of 17.02% is obtained, which is among the highest values of CsPbI 2 Br-based perovskite solar cells.
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PubMed
高影响因子
Nano Research
·
2021
·Vol. 15
·期 4
·2943-2951
·
IF 8.897
Liu Huanhuan,Lei Jia,Chen Jiali,Li Ye,Gong Changyao,Yang Shangjie,Zheng Yamin,Lu Ning,Liu Yan,Zhu Wenkun,He Rong
Photocatalytic reduction of U(VI) represents a novel and effective manner for the removal of U(VI) pollutant from radioactive wastewater. Herein, we successfully incorporated hydrogen into VO 2 nanosheets, which strengthened the interaction between VO 2 and U(VI), thereby achieving a highly active and stable photocatalyst for U(VI) reduction. With the increase of H content in hydric VO 2 (H X -VO 2 ) nanosheets, the bandgap shrank from 2.29 to 1.66 eV, whereas the position of conduction bands remained more negative than the reduction potential of U(VI)/U(IV) (0.41 V vs. NHE). When irradiated by simulated sunlight, the U(VI) removal efficiency over H 0.613 -VO 2 nanosheets reached up to 95.4% within 90 min, which largely outperformed 28.3% of pristine VO 2 nanosheets. The mechanistic study demonstrated that the hydroxylated surface gave rise to the balanced O confinement sites in VO 2 (011), leading to the stabilized adsorption configuration and increased binding strength of UO 2 2+ on H X − -VO 2 nanosheets.
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CELLULOSE
·
2021
·Vol. 29
·期 1
·213-222
·
IF 5.044
Fan Fangwei,Zhu Mengting,Fang Kaiyang,Cao Endi,Yang Yinzhi,Xie Jinpeng,Deng Zhongmin,Chen Yiren,Cao Xinwang
Cellulose nanowhiskers as one kind of renewable and biocompatible nanomaterials evoke much interest because of its versatility in various applications. Herein, the sisal cellulose nanowhiskers with ultrathin diameter of 5–10 nm, high crystallinity of 74% and C6 carboxylate groups converted from C6 primary hydroxyls were prepared via a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)/NaBr/NaClO system selective oxidization combined with mechanical homogenization. The effects of sodium hydroxide concentration in alkali pretreatment on the final sisal cellulose nanowhiskers were explored. It was found that with the increase of sodium hydroxide concentration, the sisal fiber crystalline type would change from cellulose I to cellulose II. The versatile sisal cellulose nanowhiskers would be particularly useful for applications in the nanocomposites as reinforcing phase, as well as in tissue engineering, filtration, pharmaceutical and optical industries as additives.
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Science China-Materials
·
2021
·Vol. 65
·期 5
·1391-1402
·
IF 8.273
Zhang Min,Wang Wenli,Ma He,Yu Bing,Cong Hailin,Shen Youqing
Immunotherapy has shown promising potential in cancer therapy; however, poor delivery by nanocarriers and insufficient immune response in tumors have severely impeded its clinical application. To overcome these disadvantages, a site-specific and active transcellular drug delivery system was developed herein for chemotherapy-enhanced immunotherapy. When arriving at the tumor site, the matrix metallopeptidase 2 (MMP2)-responsive shell detached from the nanosystem, releasing positively charged cores. The cationic surface of the inner cores induced adsorption-meditated transcytosis, which facilitated transendothelial transportation and transcellular drug delivery into distal tumor cells. PD-L1 antibody and chemotherapeutic drugs were loaded in the outer layer and inner cores of the nanosystem, respectively, to be precisely delivered to target sites, thereby achieving synchronized delivery and site-oriented release of different anticancer agents. PD-L1 antibody released in the tumor microenvironment effectively blocked the binding of PD-L1 to its receptors on the T cell surface. Oxaliplatin and indoximod co-delivered in the cationic cores can induce immunogenic cell death and attenuate the immunosuppressive effect throughout the tumor tissues, recruiting a large amount of T cells and further enhancing the immunotherapy. The resulting synergistic antitumor response could not only efficiently inhibit the growth of primary tumors, but also help prevent metastasis of primary tumor to distant sites. This study offers a novel nano-enabled strategy for chemo-immunotherapy in immunosuppressive tumors.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 11
·1-10
·
IF 5.833
Xie Jiaojiao,Mu Zhaode,Yan Bin,Wang Jie,Zhou Jing,Bai Lijuan
A label-free electrochemical aptasensor is reported for sensitive detection of the 6-kDa early secreted antigenic target (ESAT-6). For the first time, the bimetallic organic framework (b-MOF) of Zr-MOF-on-Ce-MOF was decorated with nitrogen-doped graphene (NG) and applied as the matrix for electroactive toluidine blue (Tb) to form the NG@Zr-MOF-on-Ce-MOF@Tb nanohybrid. The prepared nanohybrid with excellent hydrophilicity, dispersibility, and large specific surface exhibited significant electrochemical response. This nanohybrid could be directly used for anchoring ESAT-6 binding aptamers (EBA) through the interaction between the 5′-phosphate group (PO 4 3− ) of EBA and Zr 4+ of Zr-MOF. The signal response before and after incubating the ESAT-6 antigen has been evaluated by cyclic voltammetry at a scan rate of 100 mV s −1 from − 0.7 to 0.3 V (vs. SCE). Under optimal conditions, the proposed aptasensor displayed a wide linear range from 100 fg mL −1 to 10 ng mL −1 with a limit of detection (LOD) of 12 fg mL −1 . The developed method showed good reproducibility with a relative standard deviation (RSD) of 2.27%. The aptasensor showed favorable results in the analysis of the real samples. With these merits, the aptasensor has exceptional potential as a diagnostic tool for tuberculosis in clinical practice. Graphical abstract
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PubMed
高影响因子
Science China-Chemistry
·
2021
·Vol. 65
·期 1
·153-161
·
IF 9.445
Shen Saiji,Wu Chu,Shang Yinghui,Shen Hongdou,Liao Yue,Guo Yuting,Hu Min,Wang Xia,Li Gang,Wang Qigang
There are several natural materials which have evolved functional gradients, ingeniously attaining maximal efficacy from limited components. Herein, we utilized the spatiotemporal distribution of initiator acetylacetone to regulate the multienzyme polymerization and fabricate a chitosan-polymer hydrogel. The temporal priority order of acetylacetone was higher than phenol-modified chitosan by density functional theory calculation. The acetylacetone within the gelatin could gradually diffuse spatially into the chitosan hydrogel to fabricate the composite hydrogel with gradient network structure. The gradient hydrogel possessed a transferring topography from the two-dimensional pattern. A continuously decreased modulus along with acetylacetone diffusion was confirmed by atomic force microscope-based force mapping experiment. The water-retaining ability of various regions was confirmed by low-field nuclear magnetic resonance (NMR) and thermogravimetric analysis (TG) analysis, which led to the spontaneous actuation of gradient hydrogel with maximum 1821°/h curling speed and 227° curling angle. Consequently, the promising gradient hydrogels could be applied as intelligent actuators and flexible robots.
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BRAZILIAN JOURNAL OF MICROBIOLOGY
·
2021
·Vol. 53
·期 1
·161-169
·
IF 2.476
Duan Mengting,Sun Qing,Fan Wei,Fan Bing
Enterococcus faecalis ( E. faecalis ) is commonly considered to be one of chief culprits of secondary and persistent root canal infections. As antibiotic resistance has become a global issue, in order to reduce the use of antibiotics, metal ions have recently been widely used as an alternative. Silver ions (Ag + ) have been proved to be a strong bactericide but with high cytotoxicity and discoloration property. Triton X-100 (TX-100) and Ag + were co-used for the first time as a clinical intracanal medication to obtain both enhanced antibacterial effect and low cytotoxicity. The synergistic antibacterial effect of TX-100 + Ag + was tested on both planktonic and biofilm-resident E. faecalis on dentine. And the cytotoxicity was tested on MC3T3-E1 cells. Results confirmed the antibacterial activity against both planktonic and biofilm-resident E. faecalis was dramatically improved after TX-100 incorporation. TX-100 and Ag + mixture demonstrated a similar inhibitory effect as the 2% chlorhexidine (CHX), while the cytotoxicity was much lower than 2% CHX ( p < 0.05). In conclusion, TX-100 + Ag + mixture might be developed into a new effective intracanal medication as the 2% CHX.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 1
·233-243
·
IF 2.647
Zhu Lin,Huang Yuhao,Wang Baoli,Zhang Yan,Zou Ruyi,Yan Lijun,Sun Wei
Achieving an efficient electrochemical hydrogen evolution reaction (HER) implies continuous development of new electrocatalysts for reducing the electrolytic energy consumption with the improvement of the stability and economical preparation in commercial applications. In this article, a binary transition-metal (Co/Ni) phosphide incorporated with an N-doped porous carbon (NPC) carrier was synthesized via a homogeneous polymerization followed by a high-temperature carbonizing and phosphating process, which was characterized by various techniques such as XRD, XPS, SEM, and EDS. The binary metal-based phosphide material (Co x P y /Ni x P y -NPC) exhibits high efficient catalytic activity for HER with low overpotential of 126 mV and 203 mV at 10 mA mg −1 in 1.0 M KOH and seawater with KOH added, respectively. Also, it exhibits satisfactory stability for a 10 h continuous test in the alkaline electrolyte. Furthermore, Co x P y /Ni x P y -NPC has good HER performance in natural seawater electrolyte with a potential difference of 110 mV (based on Pt/C at 10 mA mg −1 ), which is superior or close to that of other metal phosphides reported in literature. The excellent catalytic performance can be attributed to the synergistic effects of Co x P y and Ni x P y nanoparticles, protecting the effect of NPC to Co x P y and Ni x P y from aggregation. This work may provide an economic and convenient method to produce carbon-supported bimetallic phosphides as electrocatalytic materials.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-11
·
IF 4.38
Wang Haitao,Zou Haiyan,Liu Yingying,Liu Zhenglong,Sun Wenshuang,Lin Kunyi Andrew,Li Tielong,Luo Shuangjiang
It’s highly desired but challenging to synthesize self-supporting nanohybrid made of conductive nanoparticles with metal organic framework (MOF) materials for the application in the electrochemical field. In this work, we report the preparation of Ni 2 P embedded Ni-MOF nanosheets supported on nickel foam through partial phosphidation (Ni 2 P@Ni-MOF/NF). The self-supporting Ni 2 P@Ni-MOF/NF was directly tested as electrode for urea electrolysis. When served as anode for urea oxidation reaction (UOR), it only demands 1.41 V (vs RHE) to deliver a current of 100 mA cm −2 . And the overpotential of Ni 2 P@Ni-MOF/NF to reach 10 mA cm −2 for hydrogen evolution reaction HER was only 66 mV, remarkably lower than Ni 2 P/NF (133 mV). The exceptional electrochemical performance was attributed to the unique structure of Ni 2 P@Ni-MOF and the well exposed surface of Ni 2 P. Furthermore, the Ni 2 P@Ni-MOF/NF demonstrated outstanding longevity for both HER and UOR. The electrolyzer constructed with Ni 2 P@Ni-MOF/NF as bifunctional electrode can attain a current density of 100 mA cm −2 at a cell voltage as low as 1.65 V. Our work provides new insights for prepare MOF based nanohydrid for electrochemical application.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 51
·期 1
·214-222
·
IF 1.938
Tian Chunxia,Tian Xi-ang,Li Yu,Wang Zhijun,Liu Li
Porous SnO 2 with high sensitivity and fast response has attracted much attention. Herein, we prepared 3D porous SnO 2 using carbon balls as a template and studied the effects of sintering time (1 h, 2 h, 3 h, 4 h) at a certain calcination temperature of 500℃ and Ho doping on the gas-sensing performance of 3D porous SnO 2 . The gas-sensing test results show that, compared with the samples obtained under other sintering time, the gas-sensing property of 3D porous SnO 2 calcined for 2 h has the highest gas sensitivity of 31 in the 50-ppm formaldehyde environment. Among the samples doped with Ho, 3D porous SnO 2 with a doping amount of 3.5% has the highest sensitivity of 65 at operating temperature of 230℃, which is twice as long as pure 3D porous SnO 2 with a calcination time of 2 h. Moreover, the sample has good selectivity, low detection limit, and good linearity. These excellent gas-sensing characteristics are mainly due to the unique morphology of 3D porous SnO 2 , more oxygen vacancies, and the influence of Ho doping. Therefore, the gas-sensing performance of the metal oxide semiconductor material can be further improved by forming the porous nanocomposite material. Graphical Abstract
(a) Response recovery time of SnO 2 obtained under different calcination times; (b) Response recovery time of SnO 2 doped with different Ho content.
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