APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Fang Wang,Xianhong Zhang,Yuhong Ma,Dong Chen,Wantai Yang
A novel flexible dielectric composite with halloysite nanotube-poly(3,4-ethylenedioxythiophene) (HNTs-PEDOT) hybrid as conductive filler and poly(vinylidene fluoride) (PVDF) as polymer matrix were prepared via a blending and hot-pressing technique. HNTs-PEDOT hybrid, with PEDOT coated onto both the negatively charged inner and out surfaces of the HNTs tubes, were fabricated by chemical oxidative polymerization of EDOT with unmodified HNTs as templates. The conductivity of HNTs-PEDOT hybrid with 50 wt% HNTs is up to 12.89 S/cm, which is 100 times greater than that of pure PEDOT (about 0.12 S/cm) synthesized under the similar condition. With PEODT as outside organic layer, HNTs-PEDOT could be easily dispersed in PVDF matrix uniformly. In addition, with the introduction of HNTs-PEDOT into PVDF matrix, it makes a phase transformation of PVDF from α to electroactive β phase. HNTs-PEDOT/PVDF shows good dielectric performance. At close to the percolation threshold value ( f HNTs-PEDOT = 0.11), the dielectric constant of HNTs-PEDOT/PVDF is up to 641 at 1000 Hz, which is attractive to prepare flexible materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 10
·4358-4371
·
IF 3.442
Zhu Zhi,Ma Changchang,Yu Kesheng,Lu Ziyang,Liu Zhi,Yan Yongsheng,Tang Xu,Huo Pengwei
It is still a challenging work to realize the universality of photocatalytic materials for unselectively removing environmental pollutants in water. Here, a ternary magnetism CoFe 2 O 4 /g-C 3 N 4 /HNTs heterojunction photocatalyst is firstly prepared, and the morphology, crystalline property, surface area, and magnetic recycling capability of the photocatalyst were investigated. The CoFe 2 O 4 /g-C 3 N 4 /HNTs shows a superior degradation efficiency for degrading 2-mercaptobenzothiazole (MBT) than that of pure g-C 3 N 4 . The high degradation performance that derives from the hollow structure of halloysite nanotubes (HNTs) can inhibit stacking of g-C 3 N 4 , which results in a larger specific surface area and more abundant reaction sites. Meanwhile, the heterojunction structure between g-C 3 N 4 and CoFe 2 O 4 improved the separation efficiency of charge carriers. In addition, the intermediate products, degradation pathway, and reaction mechanism of representative MBT pollutant over the CoFe 2 O 4 /g-C 3 N 4 /HNTs photocatalyst are revealed in depth. This work makes an important development.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2020
·Vol. 93
·期 9
·1399-1411
·
IF 0.69
Sun Li,Wu Xiaohong,Zhou Youning,Wang Chunpu,Meng Zhonghua,He Jian
Abstract The halloysite-iron oxide (Fe 3 O 4 –HNTs) hybrid material is prepared using a halloysite nanotube as precursor, and the Fe 3 O 4 is immobilized on the halloysite with subsequent modification using 3-aminopropyltriethoxysilane. The influence of pH, urea hydrolysis, and the concentration of ferric chloride, polyvinyl alcohol on the synthesis of Fe 3 O 4 –HNTs hybrid materials were investigated. FT-IR was used to understand the modification of surface functionality, while the surface morphology and surface heteroatom were investigated through SEM and XPS, respectively. The phase purity of the hybrid material was studied using XRD pattern. The investigation demonstrated that the dispersion of Fe 3 O 4 –HNTs composite in epoxy resin is better than HNTs, and a significance improvement in corrosion resistance of epoxy coatings (EP) was observed. Moreover, an attempt was made to understand the mechanism of Fe 3 O 4 –HNTs/epoxy coating.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Wanli Zhao,Yuanhui Long,Yunqing He,Jiabing Cai,Mingxian Liu
Highly stretchable hydrogel shows great potential for wearable strain sensors. However, the rapid propagation of bacteria while using wearable sensors may threaten health. In this work, HNTs@HKUST-1 composites were prepared by the incorporation of halloysite nanotubes (HNTs) during the synthesis of HKUST-1. HNTs depressed the crystal growth of the HKUST-1, which leads to the 2D nanosheet morphology. HNTs@HKUST-1 serves as a reinforcing agent for polyacrylamide (PAAm) hydrogels, and PAAm-HNTs@HKUST-1 has high tensile strain properties (elongation at break of 912.5% and tensile strength of 22.4 kPa). The Cu 2+ in HKUST-1 endows remarkable conductivity and excellent antibacterial properties to the composite. The composite hydrogels were then developed as human motion detection sensors with antibacterial property to prevent microbial infection, which show recyclability, high sensitivity, and fast responsiveness. So, they have great potential as flexible antibacterial materials to monitor movements of the human body in real-time.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhuofan Huang,Qintie Lin,Nan Cai,Qingsong Weng,Jingwei Xu,Shuchai Gan,Chao Chen,Quanfa Zhong,Hengyi Fu,Yuejie Xia,Pengran Guo
In this study, CuO/HNTs were applied to activate persulfate (PS) to firstly degrade and mineralize TCS. The morphology, crystal structure, specific surface and surface composition were characterized by SEM, TEM, BET, XRD and XPS. The experimental parameters were optimized with 0.2 g/L CuO/HNTs and 2 mM PS. TCS was totally removed in 180 min under optimized conditions. The mechanism study using the quenching reaction, EPR, XPS and electrochemistry demonstrated that even radical reactions (•OH and O 2 •- ) pathway existed; the nonradical mechanism ( 1 O 2 and surface electron transport) was dominant to the efficient TCS degradation. Using FT-ICR MS, the degradation intermediates were identified, and transformation pathways were proposed. The degradation intermediate studies indicated that TCS began to break from the aromatic ring containing monochlorine, and the Cl functional group was gradually substituted. CO 2 and H 2 O were generated with breaking of ether bonds. The toxicity of the solution was also evaluated by the survival rate of the luminescent bacteria, and the toxicity of the solution decreased overall. A stability study showed that CuO/HNTs retained good crystal structure and degradation efficiency even after 5 cycles.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 7
·9083-9089
·
IF 3.83
Hongli Liu,Lantian Zhang,Jing Li,Hongyan Li,Guoqing An,Yajing Li,Zhong Chen
SiBCN ceramic aerogels have excellent properties such as ultra-high temperature stability, low density and high thermal insulation . The aerogels have better potential applications in aerospace and other fields. However, similar to inorganic aerogels , the low mechanical strength of SiBCN ceramic aerogels are the main limitation of its application. Based on the principle of inorganic double network enhancement, the first network was constructed by PVA and HNTs , and HNTs/SiBCN dual network aerogels were constructed by SiBCN ceramic aerogels as the second network. The structure and mechanical properties were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), specific surface area analyzer and pressure tester. Compared with SiBCN ceramic aerogels, 6 wt% HNTs-SiBCN ceramic hybrid aerogels have better microscopic properties (maintaining basic porous network structure and structural stability) and mechanical properties.The continuous HNTs first network can effectively transfer the stress load and enhance the strength of SiBCN ceramic aerogels.
研究领域:
材料科学
·
无机非金属材料
·
纳米复合材料
·
航空航天材料
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高分子复合材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ke Wang,Wei Gao
Efficient thermal insulation and flame-retardant materials are crucial in reducing energy consumption and minimizing fire hazards. This work presents a novel method for preparing a composite aerogel: a silane coupling agent was used as a chemical bridge to synthesize a new flame retardant AKH (modified APP with HNTs). AKH was incorporated into the silica sol to fabricate the SA-AKH composite aerogel. SA-AKH features a dense three-dimensional network skeletal structure, excellent thermal stability, and a high specific surface area. When integrated into organosilicon resin, SA-AKH significantly enhances the flame resistance of composite materials. During cone calorimetry testing (CCT), SSAKH4 exhibited a peak heat release rate (PHRR) of 281.88 kW/m 2 and total smoke production (TSP) of 5.52 m 2 , representing a decrease of 30.8 % and 4.5 %, respectively, compared to SSA4. The composite material, derived from the unique mesoporous structure of aerogel combined with the flame retardant and hollow characterization of AKH, demonstrates exceptional flame retardancy and smoke suppression. SA-AKH is expected to make novel advancements in the field of high-efficiency insulation and flame-resistant composites.
研究领域:
材料科学
·
能源工程
·
防火材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2018
·
IF 4.841
Dongyao Wu,Jinze Li,Jingru Guan,Chongyang Liu,Xiaoxu Zhao,Zhi Zhu,Changchang Ma,Pengwei Huo,Chunxiang Li,Yongsheng Yan
An Intercalated heterostructural g-C 3 N 4 /TiO 2 /HNTs supported photocatalyst was successfully prepared via sol–gel and calcination methods. The introduction of HNTs and the g-C 3 N 4 -TiO 2 heterojunction effectively enhanced the charge transfer and separation efficiency of photogenerated electron–hole pairs, which endued the g-C 3 N 4 /TiO 2 /HNTs hybrid material with an outstanding photoelectric performance and good stability. And an obviously enhanced photocatalytic activity was exhibited by photodegrading ciprofloxacin compared with pure TiO 2 . Furthermore, the main active species were detected through trapping experiment and ESR spin-trap technique with DMPO, which confirmed that the O 2 − and the h + were the main active species in the photocatalytic system.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Ke Wang,Wei Gao
A novel silica-based composite aerogel SA-DKH was synthesized via functionalization of alkali-treated halloysite nanotubes (HNTs-OH) with a DOPO (10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide)-derived silane coupling agent. SA-DKH exhibited exceptional thermal stability and high specific surface area (748.53–779.62 m 2 /g). In air atmosphere, SA-DKH3 demonstrated a 219.0 °C increase in initial decomposition temperature compared to SA-HNTs3 (composite aerogel synesis using 6 g 4.5 % HNTs-EtOH suspension). SA-DKH significantly enhanced thermal insulation, smoke suppression, and flame retardancy when incorporated into silicone resin composites. Notably, the total smoke production (TSP) of SSDKH4 (composite resin with 8 % SA-DKH) was reduced by 12.2 % (3.90 m 2 ) relative to SSHNTs4 (composite resin with 8 % SA-HNTs). Furthermore, SSDKH4 displayed ultralow thermal conductivity (0.10 W/m·K) and minimal water absorption (0.32 %), while maintaining robust resistance to acids, alkalis, and stains after 12 months of aging. The synergistic flame retardant mechanism involving gas-phase radical quenching by PO·/PO 2 · and condensed-phase char reinforcement via DOPO-HNTs interactions was systematically elucidated. This work provides a novel strategy for designing flame retardant and thermal insulation silicone resin composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Qiang Le,Zan Liu,Zhilin Cheng
In this work, a novel core-shell nanostructured coaxial nanofiber membranes (CFMs) were successfully produced by the coaxial electrospinning . The structure and composition of CFMs were probed by a series of characterizations. The results demonstrated that the CFMs were comprised of the versatile core-shell structure nanofibers, therein Cu(I)/UIO-66 scattered in the shell layer and HNTs dispersed in the core layer. As applied in the selective adsorption desulfurization , the Cu(I)/UIO-66 embedded on the surface of the nanofiber undertook the adsorption active sites, while HNTs in core layer served as enhancing the mechanical performance of PAN nanofibers. The CFMs had the superior adsorption performance in the batch adsorption (maximum:40.14 mg·g −1 ) and fixed-bed adsorption (maximum: 47.43 mg·g −1 ) capacities for benzothiophene (BT) from fuel oil, respectively. Furthermore, due to having the robust mechanical performance, the CFMs exhibited the preferable recycling adsorption and mechanical stability . The adsorption mechanism of BT molecules on CFMs was explored by the kinetics, isotherms and thermodynamic models , indicating the existence of the synergistic effect of physical adsorption and chemical adsorption.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
De-Yu Gao,Zan Liu,Zhi-Lin Cheng
In this work, we successfully prepared the 2D Ni-Fe MOF-HNTs composites by in-situ hydrothermal growth, followed by enabling it to full into PVA hydrogels, thereupon fabricating the oil/water separation 2D Ni-Fe MOF-HNTs/PVA-decorated stainless steel mesh. The structures and mechanical properties of the composites were identified by a series of characterizations. The results showed that the 2D Ni-Fe MOF nanosheets were gown on the outer surface of HNTs to form the exclusive composite structure and the 2D Ni-Fe MOF-HNTs/PVA composite membrane possessed a more compact pore structure, which exhibited the outstanding mechanical performance and the fatigue resistance ability. The surface property characterizations demonstrated that the 2D Ni-Fe-MOF-HNTs/PVA composite membrane had the superhydrophilic and underwater superoleophobic features. Ultimately, the results of the water flux and separation efficiency on 2D Ni-Fe-MOF-HNTs/PVA composite membrane for oil-water separation and emulsion separation corroborated that it was a promising high-performance separation composite membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Liang Zhou,Yi He,Heng Shi,Guoqing Xiao,Shunhui Wang,Zhenyu Li,Jingyu Chen
Water-purification membranes with high water flux, excellent recycling ability, good anti-fouling property, wide range for different oil/water emulsions separation, and strong water-soluble dyes removal ability are highly desirable for water purification but still a challenge to be realized. In this work, we show a simple method to address this challenge, in which halloysite nanotubes (HNTs) have been decorated on the poly (vinylidene fluoride) (PVDF) membrane surface through one-pot method via the aid of KH550 and dopamine. The [email protected] composite membrane exhibits superhydrophilic and under-water superoleophobic performance. In addition, our membrane can separate wide oil/water emulsions (including surfactant-stabilized and surfactant-free emulsions) from wastewater with high efficiency (>99.65%), outstanding recycle ability with good flux recovery rate (FRR > 95%) and good anti-fouling performance (the underwater oil contact angle (OCA) is 155.8 ± 1.8° with low oil adhesion) and high water flux (7994 ± 150 L m −2 h -1 ). Interestingly, our membrane also removes different water-soluble dyes (e.g., Congo red, methylene blue, and rhodamine B) from waste water by simply filtering. Those outstanding properties make our membrane hold great potential applications in real-world water purification and environmental protection.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）