Membranes
·
2021
·Vol. 11
·期 9
·693
·
IF 4.106
Fei Guo,Bingzhang Li,Rui Ding,Dongsheng Li,Xiaobin Jiang,Gaohong He,Wu Xiao
Mixing a polymer matrix and nanofiller to prepare a mixed matrix membrane (MMM) is an effective method for enhancing gas separation performance. In this work, a unique UiO-66-decorated halloysite nanotubes composite material (UiO-66@HNT) was successfully synthesized via a solvothermal method and dispersed into the Pebax-1657 matrix to prepare MMMs for CO2/N2separation. A remarkable characteristic of this MMM was that the HNT lumen provided the highway for CO2diffusion due to the unique affinity of UiO-66 for CO2. Simultaneously, the close connection of the UiO-66 layer on the external surface of HNTs created relatively continuous pathways for gas permeation. A suite of microscopy, diffraction, and thermal techniques was used to characterize the morphology and structure of UiO-66@HNT and the membranes. As expected, the embedding UiO-66@HNT composite materials significantly improved the separation performances of the membranes. Impressively, the as-obtained membrane acquired a high CO2permeability of 119.08 Barrer and CO2/N2selectivity of 76.26. Additionally, the presence of UiO-66@HNT conferred good long-term stability and excellent interfacial compatibility on the MMMs. The results demonstrated that the composite filler with fast transport pathways designed in this study was an effective strategy to enhance gas separation performance of MMMs, verifying its application potential in the gas purification industry.Keywords:composite material;UiO-66;HNT;mixed matrix membrane;CO2/N2separation
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zongshuai Gong,Silin Zheng,Jin Zhang,Yueqin Duan,Zhiqiang Luo,Fengshi Cai,Zhihao Yuan
Li-organic batteries (LOBs) are promising advanced battery systems because of their unique advantages in capacity, cost, and sustainability. However, the shuttling effect of soluble organic redox intermediates and the intrinsic dissolution of small-molecular electrodes have hindered the practical application of these cells, especially under high operating temperatures. Herein, a cross-linked membrane with abundant negative charge for high-temperature LOBs is prepared via electrospinning of poly(vinyl alcohol) containing halloysite nanotubes (HNTs). The translocation of negatively charged organic intermediates can be suppressed by the electronic repulsion and the cross-linked network while the positively charged Li+ are maintained, which is attributed to the intrinsic electronegativity of HNTs and their well-organized and homogeneous distribution in the PVA matrix. A battery using a PVA/HNT composite separator (EPH-10) and an anthraquinone (AQ) cathode exhibits a high initial discharge capacity of 231.6 mAh g–1 and an excellent cycling performance (91.4% capacity retention, 300 cycles) at 25 °C. Even at high temperatures (60 and 80 °C), its capacity retention is more than 89.2 and 80.4% after 100 cycles, respectively. Our approach demonstrates the potential of the EPH-10 composite membrane as a separator for high-temperature LOB applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-20
·
IF 2.8
Qi Zhijia,Zhang Shengsheng,Huang Jiaju,Li Juan,Jiang Junjiong,Fan Ping,Yang Jintao
Flexible PVDF-based piezoelectric nanogenerators (PENGs) are promising mechanical energy harvesters for powering wearable devices and portable electronics. In this work, a new hybrid nanocomposite was prepared by coating polyaniline on the surface of halloysite nanotube (HNT@PANI) and PENGs were fabricated by using electrospun nanocomposite fiber mats comprising HNT@PANI and poly(vinylidene fluoride) (PVDF). The rough surface of PANI outer layer and its electronegative properties favors a large interface and a strong interfacial interaction with PVDF matrix, which efficiently improves the β-phase crystal content and the crystallinity of PVDF simultaneously, resulting in an enhanced output performance in the fibrous nanocomposite PENGs. When the nanocomposite fiber mats are composed of 1 wt% HNT@PANI nanoparticles, the open-circuit voltage of the PENG is up to 30 V, which is six times higher than that of pure PVDF, and it can also light up 17 red LEDs. Furthermore, the open-circuit voltage was found unchanged after being subjected to continuous tapping for 5 weeks in the durability test. In addition, the PENG can charge a capacitor to 4.4 V within 60 s. This flexible self-powered PENG with good durability and high outputs has the potential to be used as a self-charging power source and applied in the field of wearable flexible electronic devices.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Jian Gou,Luxin Xing,Yousong Hu,Lina Zhang,Yongxin Li,Ning Bi,Yuanyuan Huang,Jun Xu,Lei Jia
A polychromatic fluorescent nanoprobe based on natural halloysite nanotubes with fluorescent dyes and porous metal–organic frameworks co-loaded on the surface and inner wall of the nanotubes was constructed for the highly sensitive visual identification of the Bacillus anthracis biomarker 2,6-dichlorophenolic acid (DPA). The limit of detection for DPA was 11.27 nM, which is significantly lower than the spore-borne dose for anthrax infection (60 uM). The multi-color fluorescent probe showed potential for rapid, accurate, and highly selective detection of Bacillus anthracis markers in actual samples. Besides, a portable fluorescence detection platform was developed in combination with a smartphone color scanning APP to simplify the detection process and realize real-time semi-quantitative analysis.
研究领域:
纳米技术
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生物技术
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分析化学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2015
·
IF 1.09
YAN WANG,YAOFENG ZHU,YAQIN FU
A novel shear thickening fluid (STF) obtained from a halloysite nanotube (HNT) and SiO 2 compounded system was successfully prepared using HNT and nano- SiO 2 as dispersed phases and polyethylene glycol 200 (PEG200) as the dispersion medium. The steady rheological behavior of the STF was investigated using a high-speed rotational rheometer, and the dispersion states of SiO 2 and HNT in PEG200 were characterized by field emission scanning electron microscopy and transmission electron microscopy. Results show that HNT and SiO 2 coexisted in the compounded system, and presented a special state that was both uniformly dispersed and partially enriched. The shear thickening effect of the STF was significantly enhanced by the enrichment of SiO 2 loaded on the surface of HNTs in the compounded system.
研究领域:
材料科学
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Jiajun Li,Ming Guo,Yan Shao,Hongwei Yu,Kaijie Ni
To improve the efficiency of electrochemical degradation of wastewater, lead dioxide was synthesized by a hydrothermal method with low cost, simple operation, and high conversion rate. β-PbO2/HNT composites were prepared by a hydrothermal method with Halloysite nanotubes (HNTs) and β-PbO2. The PbO2/HNT/ITO electrode was prepared by modifying the β-PbO2/HNT composite on an indium tin oxide (ITO) conductive glass electrode. The morphology of the material was characterized by scanning electron microscopy and transmission electron microscopy. The electrochemical performance of the electrode was measured by cyclic voltammetry, the galvanostatic charge–discharge method, and the AC impedance method. Electrolysis of typical dye wastewater by electrochemical oxidation was carried out. The effect of electrochemical degradation of wastewater with new electrodes was investigated and the degree of electrodes falling off was compared. The solubility of electrodes was investigated by inductively coupled plasma mass spectrometry lead element analysis of wastewater. The results showed that the β-PbO2/HNT electrodes were prepared successfully and had good charge–discharge performance and lifetime. The removal rate of electrolytic dye wastewater was 85.86%, and the degradation effect was better than that of pure PbO2 electrodes. In this work, a new type of β-PbO2/HNT/ITO electrode has been prepared, which improved the degradation efficiency of wastewater and opened up the prospect of HNT application.
研究领域:
环境科学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuemei Zhang,Xueyu Cheng,Chenghao Guo,Lijing Lu,Lixin Lu,Yongjin Qiao
Stimuli-responsive active packaging materials represent a promising frontier in food preservation by combining controlled-release functionality with environmental adaptability. Herein, a novel pH-responsive antibacterial bioactive packaging film based on a chitosan/gelatin (CS/GA) composite was developed by incorporating nanocomposites (NP) prepared through layer-by-layer assembly of natural polyelectrolytes onto modified halloysite nanotube (HNT), with carvacrol (Car) as the encapsulated active agent. The results showed that the developed composite films exhibited pH-responsive behavior under different pH conditions (4.0, 7.0, and 9.0), with a preferential release under alkaline conditions. The release rate was governed by the synergistic effects of carrier structural relaxation/dissolution within the NP, film diffusion, and structural relaxation/dissolution. In addition, hydrogen bonding and electrostatic interactions among CS, GA, and the NP improved the dispersion of the NP within the film matrix, thereby enhancing the film's mechanical strength, gas barrier performance, and thermal stability. The resulting active film effectively inhibited the growth of E. coli and S. aureus , and markedly prolonged the shelf life of pork. Overall, the developed pH-responsive active packaging films have great potential for application in future smart food preservation systems and lay a foundation for designing stimuli-responsive materials for different food environments.
研究领域:
食品科学
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材料科学
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纳米技术
·
包装技术
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抗菌技术
✓ 已验证
产品关联
DOI
高影响因子
Food Packaging and Shelf Life
·
2021
·
IF 6.429
Lijing Lu,Yingjie Su,Jing Xu,Haoyue Ning,Xueyu cheng,Lixin Lu
In order to inhibit the spoilage of the packaged food , a gas phase controlled-release low-density polyethylene (LDPE) film containing carvacrol loaded with halloysite nanotubes (HNTs) was prepared and studied in this work. HNTs were etched by 4 mol/L hydrochloric acid to obtain HNT-4M, which increased the carvacrol loading capacity. Then, it was characterized before and after loading with carvacrol by transmission electron microscopy , nitrogen adsorption isotherms, and thermogravimetric analysis . A new LDPE film containing carvacrol adsorbed on HNT-4M was prepared by extrusion, and the physical properties were studied. In addition, the release rate of carvacrol in the film was measured, and the antibacterial and antioxidant properties of the film were evaluated. The results showed that the carvacrol load of HNT increased from 6.7% to 24.2% after acid etching. The diffusion coefficient of carvacrol from the active film containing HNT-4 M/carvacrol was 9.546 × 10 -12 cm 2 ·s -1 , which was decreased by 57.3% compared with the films directly adding carvacrol. Moreover, according to the DPPH radical scavenging assay and micro-atmosphere diffusion antibacterial test, it was verified that carvacrol retained its antioxidant activity and antibacterial activity in the new film.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 31
·e52720
·
IF 3.057
Xiaolong Wang,Weiguang Gong,Xin Meng,Chenyang Li,Jin Gao
Biobased flame retardant (FR) has attracted great interest owing to its green and degradable properties similar to polylactic acid (PLA). In this work, with ammonium polyphosphate (APP) as the core, chitosan (CS) and halloysite (HNT) as the shell, a biobased FR (APP@CS@HNT) with a core-shell structure was prepared through the self-assembly method. The flame retardancy of PLA composites has been improved with the addition of the FR (APP@CS@HNT). With the loading of 17 wt% APP@CS@HNT, the PLA composite shows a high limiting oxygen index value (29.4%) and achieves vertical burning (UL-94) test V0 rating. Compared with pure PLA, the cone calorimetry test indicates that the peak heat release rate (PHRR) and total heat release decrease from 299.88 to 152.29 kW/m 2 and from 102.0 to 71.2 MJ/m 2 , respectively. The addition of APP@CS@HNT can also improve the smoke suppression performance of PLA composites. Such enhanced flame retardancy is mainly attributed to APP@CS@HNT prompting the PLA matrix to produce more continuous and denser carbon layers at a lower temperature to form physical barriers.
研究领域:
材料科学
·
高分子科学
·
消防安全工程
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纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）