Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Zhang Lei,Chen Lu,Wang Siheng,Wang Shanshan,Wang Dan,Yu Le,Xu Xu,Liu He,Chen Chaoji
Self-powered skin attachable and detachable electronics are under intense development to enable the internet of everything and everyone in new and useful ways. Existing on-demand separation strategies rely on complicated pretreatments and physical properties of the adherends, achieving detachable-on-demand in a facile, rapid, and universal way remains challenging. To overcome this challenge, an ingenious cellulose nanofiber-mediated manifold dynamic synergy strategy is developed to construct a supramolecular hydrogel with both reversible tough adhesion and easy photodetachment. The cellulose nanofiber-reinforced network and the coordination between Fe ions and polymer chains endow the dynamic reconfiguration of supramolecular networks and the adhesion behavior of the hydrogel. This strategy enables the simple and rapid fabrication of strong yet reversible hydrogels with tunable toughness ((Value max -Value min )/Value max of up to 86%), on-demand adhesion energy ((Value max -Value min )/Value max of up to 93%), and stable conductivity up to 12 mS cm −1 . We further extend this strategy to fabricate different cellulose nanofiber/Fe 3+ -based hydrogels from various biomacromolecules and petroleum polymers, and shed light on exploration of fundamental dynamic supramolecular network reconfiguration. Simultaneously, we prepare an adhesive-detachable triboelectric nanogenerator as a human-machine interface for a self-powered wireless monitoring system based on this strategy, which can acquire the real-time, self-powered monitoring, and wireless whole-body movement signal, opening up possibilities for diversifying potential applications in electronic skins and intelligent devices.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
·
IF 3
Yuan Bihe,Wu Shusheng,Zhao Huidong,Niu Yi,Gao Zeyang,Zhu Yu,Kong Yue,Jin Hang,Wang Pengcheng
The combustion of polystyrene (PS) releases enormous amounts of smoke and heat, which seriously affects individuals and property safety. This research employed a porous metal–organic framework (P-Fe-MOF) with excellent adsorption properties to fix 1,1'-bis(diphenylphosphino)ferrocene (BDF) into its porous channels to form a novel flame-retardant system. The peak heat release rate (PHRR) of the neat PS is reduced by 49.3% (from 1128 to 572 kW m −2 ) with the addition of 3 mass% of D-Fe-MOF, while the time to reach the peak is delayed form 170 to 250 s. Additionally, there is an obvious enhancement in thermal stability. The temperature at initial mass losses is significantly delayed from 331 °C for bulk PS to 379 °C for PS/D-Fe-3.0. And the char residue at 700 ℃ is increased from 1.27 to 3.24 mass%. Compared with pure PS, the char residue of PS/D-Fe-MOF is continuous and dense due to the excellent catalytic performance of D-Fe-MOF in the combustion of composites. This research presents a new flame-retardant design strategy and reduces the fire risk of PS, which provides valuable enlightenment for broadening the application field of MOF and improving the comprehensive properties of polymers.
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BIOLOGY AND FERTILITY OF SOILS
·
2017
·Vol. 53
·期 6
·663-675
·
IF 3.683
Zhao Hai-Ming,Hu Rui-Wen,Huang He-Biao,Wen Hong-Fei,Du Huan,Li Yan-Wen,Li Hui,Cai Quan-Ying,Mo Ce-Hui,Liu Jie-Sheng,Wong Ming-Hung
The widely used plastic film containing di(2-ethylhexyl) phthalate (DEHP) in agriculture has caused serious soil pollution and poses risks to human health through the food chain. An effective DEHP degradation bacteria, Microbacterium sp. J-1, was newly isolated from landfill soil. Response surface methodology was successfully employed for optimization resulting in 96% degradation of DEHP (200 mg L −1 ) within 5 days. This strain degraded DEHP by hydrolysis of the ester bond and hydroxylation of the aromatic ring to form 2-ethyl hexanol, mono-(2-ethylhexyl) phthalate, phthalate acid, and protocatechuic acid, and subsequently transformed these compounds with a maximum specific degradation rate ( q
max ), half-saturation constant ( K
s
), and inhibition constant ( K
i
) of 1.46 day −1 , 180.2 mg L −1 , and 332.8 mg L −1 , respectively. Bioaugmentation of DEHP-contaminated soils with the strain J-1 greatly enhanced the DEHP dissipation rate (~88%). Moreover, this strain could efficiently colonize the rhizosphere soil of inoculated vegetables and further enhanced DEHP degradation (~97%), leading to a significant decrease (>70%) in DEHP accumulation in shoots and roots of the inoculated vegetables compared to uninoculated vegetables. The results highlighted the roles of the inoculated exogenous bacteria in simultaneously bioremediating contaminated soils and reducing bioaccumulation of DEHP in the edible part of the vegetable for food safety.
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POLYMER BULLETIN
·
2017
·Vol. 75
·期 7
·2887-2900
·
IF 1.43
Liu Qian,Yan Chun-Na,Xu Xin-Meng,Wang Li-Ping,Li Guang
Novel poly(hydroxypropyl acrylate)- co -poly(hydroxypropyl acrylate)-rhodamine B (PHPA- co -PHPA-RhB) hydrophilic copolymers were synthesized via radical polymerization in this paper. And then the honeycomb-structured porous films were fabricated by dropping the (PHPA- co -PHPA-RhB) copolymers and PS solution on glass substrates by breath figure method (BFM). The effects of solvent, hydrophilic copolymers’ molecular weight, the proportion of hydrophilic copolymers and hydrophobic polymers on the formation of porous films were investigated. The porous films were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), spectrofluorometer and confocal laser scanning microscope (CLSM). The results show that PHPA- co -PHPA-RhB and PS solutions can form regular honeycomb porous films; the average diameter of the films pore decreases with the proportion of hydrophobic polystyrene increased. Similar regular was also found when the molecular weight of PHPA- co -PHPA-RhB was enhanced. Furthermore, the fluorescence properties of the porous films were also investigated in this study.
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IONICS
·
2017
·Vol. 24
·期 3
·845-859
·
IF 2.062
Xiao Qi,Feng Mengmeng,Liu Yi,Lu Shuangyan,He Yingzi,Huang Shan
A sensitive and selective electrochemical sensor based on carboxyl graphene (CG), polypyrrole (PPy), and chitosan (CS) nanocomposite-modified glassy carbon electrode (GCE) has been developed for nitrite determination. The electrochemical performances of CG/PPy/CS/GCE were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Under the optimum experimental conditions, CG/PPy/CS/GCE exhibited excellent differential pulse voltammetry (DPV) response of nitrite. A linear relationship between DPV peak current and the concentration of nitrite was obtained in the range of 0.2 to 1000 μM. The limit of detection of nitrite was estimated to be 0.02 μM. Using such modified electrodes, our method is quite reproducible for nitrite determination, even for real water samples.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Yi Xin,Wu Yuxuan,Tan Guoxin,Yu Peng,Zhou Lei,Zhou Zhengnan,Chen Junqi,Wang Zhengao,Pang Jinshan,Ning Chengyun
Traced dopamine (DA) detection is critical for the early diagnosis and prevention of some diseases such as Parkinson’s, Alzheimer and schizophrenia. In this research, a novel self-supporting three dimensional (3D) bicontinuous nanoporous electrochemical biosensor was developed for the detection of dopamine by Differential Pulse Voltammetry (DPV). This biosensor was fabricated by electrodepositing palladium nanoparticles (Pd) onto self-supporting nanoporous gold (NPG) wire. Because of the synergistic effects of the excellent catalytic activity of Pd and novel structure of NPG wire, the palladium nanoparticles decorated NPG (Pd/NPG) biosensor possess tremendous superiority in the detection of DA. The Pd/NPG wire biosensor exhibited high sensitivity of 1.19 μA μΜ −1 , broad detection range of 1–220 μM and low detection limit up to 1 μM. Besides, the proposed dopamine biosensor possessed good stability, reproducibility, reusability and selectivity. The response currents of detection in the fetal bovine serum were also close to the standard solutions. Therefore the Pd/NPG wire biosensor is promising to been used in clinic.
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Nano Research
·
2017
·Vol. 11
·期 2
·1135-1145
·
IF 7.354
Jia Jingchun,Hu Xiang,Wen Zhenhai
A strategy was developed to fabricate a set of MnO@C nanohybrids with MnO nanoparticles (NPs) embedded in an ultrathin three-dimensional (3D) carbon framework for use as anode materials for lithium-ion batteries (LIBs). The 3D carbon frameworks provide MnO NPs with electrical pathways and mechanical robustness, which efficiently improved the reaction kinetics, prevented the MnO from fracturing and agglomerating, and limited the formation of a solid electrolyte interface (SEI) at the MnO–electrolyte interface. Benefitting from the unique 3D framework structure, the MnO/C nanohybrids carbonized at 500 °C exhibited a highly reversible specific capacity of 1,420 mAh·g −1 at 0.2 A·g −1 , excellent cycling stability with 98% capacity retention, and enhanced rate performance of 680 mAh·g −1 at 2 A·g −1 . The feasibility of the large-scale production of such MnO/C nanohybrids, associated with their outstanding Li-ion storage properties, opens a promising avenue for the development of high-performance anodes for nextgeneration LIBs.
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JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 6
·1-11
·
IF 1.615
Xia Shan,Gao Yang,Yu Zhe,Duan Lijie,Gao Guang Hui
A novel pH-sensitive charge reversal and self-fluorescent polymeric micelle is designed and synthesized successfully. The smart micelle is prepared based on MPEG-polyurethane multi-block copolymer, which is synthesized by polycondensation, with 1, 4-bis (hydroxyethyl) piperazine (HEP) and hydroxyl-sulfamethazine (Hydroxyl-SM) as pH-sensitive molecules and fluorescein isothiocyanate (FITC) as fluorescent segment. The resulting MPEG-polyurethane multi-block copolymer is examined by 1 H–NMR, UV-vis spectra, fluorescence spectra and an acid-base titration. Moreover, the diameter, morphology and cytotoxicity of obtained polymer micelle are measured by dynamic light scattering (DLS), transmission electron microscopy (TEM) and MTT assay. The results indicate that the micelle has a small diameter of less than 200 nm and can remain unchanged within two weeks. Zeta-potential measurement shows that the negative charge of micelle can switch into positive charge as the pH value decreasing from 9.0 to 3.0. Subsequently, the fluorescence intensity decreases significantly with the reducing of pH values. The MTT assay shows the low cytotoxicity and good biocompatibility of the MPEG-polyurethane polymeric micelles. Finally, doxorubicin (DOX) is loaded into micelles to detect in vitro release behavior. The drug loaded micelles show a faster release behavior at pH 5.0 than that at pH 7.4. Therefore, the pH-sensitive charge reversal and self-fluorescent micelle can be a potential smart carrier for delivery and controlled release of protein drug.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 12
·7428-7438
·
IF 2.599
Chen Yipeng,Wang Hanwei,Yao Qiufang,Fan Bitao,Wang Chao,Xiong Ye,Jin Chunde,Sun Qingfeng
The surfaces of plants represent multifunctional interfaces between the organisms and the environment. In this paper, biomimetic taro leaf-like structures with superparamagnetic and superhydrophobic performances were exactly copied on the wood surface through the soft lithography to improve the wood properties. Fe 3 O 4 nanoparticles were mixed into poly(dimethylsiloxane) PDMS suspensions to obtain Fe 3 O 4 /PDMS suspensions that commonly endow coats magnetic and microwave absorption properties, which were then cast onto the wood surface and packaged by PDMS stamps replicated from fresh taro leaves. Fe 3 O 4 /PDMS films, which coexisted superhydrophobic surface and superparamagnetic property, were created on the wood surface after the being dried and stamps were peeled off. The as-prepared wood surface exhibited unique taro leaf-like micro- and nanostructures, microwave absorption, superparamagnetism performances with maximum saturation magnetization ( M
s ) of 22.9 emu g −1 and superior static superhydrophobicity with a water contact angle of 152° ± 2°. This research may provide a feasible pathway for constructing naturally biomorphic structures on the wood surface with tailored functions.
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Journal of Neuroinflammation
·
2024
·Vol. 21
·期 1
·1-17
·
IF 9.3
Gao Dandan,Zou Bin,Zhu Kunyuan,Bi Shijun,Zhang Wenxu,Yang Xinyu,Lai Jieyu,Liang Guobiao,Pan Pengyu
Background Subarachnoid hemorrhage (SAH) is a severe cerebrovascular disorder primarily caused by the rupture of aneurysm, which results in a high mortality rate and consequently imposes a significant burden on society. The occurrence of SAH initiates an immune response that further exacerbates brain damage. The acute inflammatory reaction subsequent to SAH plays a crucial role in determining the prognosis. Th17 cells, a subset of T cells, are related to the brain injury following SAH, and it is unclear how Th17 cells are cleared in the brain. Meningeal lymphatic vessels are a newly discovered intracranial fluid transport system that has been shown to drain large molecules and immune cells to deep cervical lymph nodes. There is limited understanding of the role of the meningeal lymphatic system in SAH. The objective of this research is to explore the impact and underlying mechanism of drainage Th17 cells by meningeal lymphatics on SAH.Methods Treatments to manipulate meningeal lymphatic function and the CCR7-CCL21 pathway were administered, including laser ablation, injection of VEGF-C geneknockout, and protein injection. Mouse behavior was assessed using the balance beam experiment and the modified Garcia scoring system. Flow cytometry, enzyme-linked immunosorbent assays (ELISA), and immunofluorescence staining were used to study the impact of meningeal lymphatic on SAH drainage. Select patients with unruptured and ruptured aneurysms in our hospital as the control group and the SAH group, with 7 cases in each group. Peripheral blood and cerebrospinal fluid (CSF) samples were assessed by ELISA and flow cytometry.Results Mice with SAH showed substantial behavioral abnormalities and brain damage in which immune cells accumulated in the brain. Laser ablation of the meningeal lymphatic system or knockout of the CCR7 gene leads to Th17 cell aggregation in the meninges, resulting in a decreased neurological function score and increased levels of inflammatory factors. Injection of VEGF-C or CCL21 protein promotes Th17 cell drainage to lymph nodes, an increased neurological function score, and decreased levels of inflammatory factors. Clinical blood and CSF results showed that inflammatory factors in SAH group were significantly increased. The number of Th17 cells in the SAH group was significantly higher than the control group. Clinical results confirmed Th17 cells aggravated the level of neuroinflammation after SAH.Conclusion This study shows that improving the drainage of Th17 cells by meningeal lymphatics via the CCR7-CCL21 pathway can reduce brain damage and improve behavior in the SAH mouse model. This could lead to new treatment options for SAH.
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FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 12
·4823-4830
·
IF 2.2
Cao Jiandong,Liu Hailiang,Chen Qinjia,Bai Yongxiao
Carbon fiber reinforced polyolefin (CFRPO) composites have been widely applied in many engineering fields owing to their high specific strength and stiffness. However, carbon fiber (CF) with a chemically inert surface and low surface energy results in the weak interfacial interaction and mechanical properties of CFRPO composites. In this work, thermally reduced graphene was coated on CF with poly(diallyldimethylammonium chloride) (PDDA) as a modifier and coupling agent to improve the interfacial strength between CF and the matrix. After incorporated in linear low-density polyethylene (LLDPE) by melt compounding, the yield strength, yield modulus and thermal conductivity of modified CF reinforced polyethylene (LLDPE/CF-PLG) composite were increased by 18.18%, 16.48% and 5.27%, respectively, and the volume resistivity was decreased by 35.32% compared with LLDPE/CF at 30 wt.% content. The characterization results demonstrate that the enhancement of mechanical properties is attributed to the increased specific surface area, surface roughness and oxygen-containing functional groups on the surface of CF-PLG. This strategy provides a new approach for the enhancement of CF reinforced polymer composites.
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BMC BIOLOGY
·
2024
·Vol. 22
·期 1
·1-19
·
IF 4.4
Jiang Hexiang,Sun Yi,Li Fengyang,Yu Xibing,Lei Siyu,Du Sulan,Wu Tong,Jiang Xuan,Zhu Junhui,Wang Jun,Ji Yalu,Li Na,Feng Xin,Gu Jingmin,Han Wenyu,Zeng Lei,Lei Liancheng
Background Ribosomal protein SA (RPSA) of human brain microvascular endothelial cells (HBMECs) can transfer from the cytosol to the cell surface and act as a receptor for some pathogens, including Streptococcus suis serotype 2 (SS2), a zoonotic pathogen causing meningitis in pigs and humans. We previously reported that SS2 virulence factor enolase (ENO) binds to RPSA on the cell surface of HBMECs and induces apoptosis. However, the mechanism that activates RPSA translocation to the cell surface and induces ENO-mediated HBMEC apoptosis is unclear.Results Here, we show that RPSA localization and condensation on the host cell surface depend on its internally disordered region (IDR). ENO binds to the IDR of RPSA and promotes its interaction with RPSA and vimentin (VIM), which is significantly suppressed after 1,6-Hexanediol (1,6-Hex, a widely used tool to disrupt phase separation) treatment, indicating that ENO incorporation and thus the concentration of RPSA/VIM complexes via co-condensation. Furthermore, increasing intracellular calcium ions (Ca2+) in response to SS2 infection further facilitates the liquid-like condensation of RPSA and aggravates ENO-induced HBMEC cell apoptosis.Conclusion sTogether, our study provides a previously underappreciated molecular mechanism illuminating that ENO-induced RPSA condensation activates the migration of RPSA to the bacterial cell surface and stimulates SS2-infected HBMEC death and, potentially, disease progression. This study offers a fresh avenue for investigation into the mechanism by which other harmful bacteria infect hosts via cell surfaces’ RPSA.
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