POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Le Li,Yifan Liu,Haishun Zhang,Huajie Shen,Xiaoxuan Yin,Haoyi Li,Honggang Peng,Songsong Zhou,Yunpeng Liu
This study proposes a modification strategy for polyurea (PU) using halloysite nanotubes (HNTs) loaded with titanium dioxide (TiO 2 ) to enhance the ultraviolet (UV) aging resistance of PU materials. TiO 2 –HNT nanocomposite fillers were prepared through the surface loading modification, and the effects of different TiO 2 –HNT concentrations (2–10 wt%) on the structural, hydrophobic, and dielectric properties of PU composites were systematically investigated. Through the analysis of the test results, we discovered an interesting phenomenon: the UV shielding performance of the nanocomposite enhances the UV resistance of PU at low content levels, whereas at high content levels, the photocatalytic effect of TiO 2 accelerates PU degradation. With 4 wt% TiO 2 –HNT loading, PU exhibited the best stability and achieved a 76.4% enhancement in dielectric constant while maintaining hydrophobicity (contact angle >110°). After 300 h of accelerated UV aging, the optimized PU retained 83.9% of its initial breakdown strength, outperforming pure PU (76.1% retention), and its dielectric loss was 25.8% lower than that of pure PU. The developed nanocomposite offers a green and efficient solution for enhancing the durability and stability of insulation materials in high-voltage transmission systems.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Royal Society Open Science
·
2016
·Vol. 3
·期 12
·
IF 0
Zhuwen Chen,Jiaying Zeng,Dong Lv,Jinqiang Gao,Jian Zhang,Shan Bai,Ruili Li,Mei Hong,Jingshen Wu
Some key parameters of supports such as porosity, pore shape and size are of great importance for fabrication and performance of zeolite membranes. In this study, we fabricated millimetre-thick, self-standing electrospun ceramic nanofibre mats and employed them as a novel support for zeolite membranes. The nanofibre mats were prepared by electrospinning a halloysite nanotubes/polyvinyl pyrrolidone composite followed by a programmed sintering process. The interwoven nanofibre mats possess up to 80% porosity, narrow pore size distribution, low pore tortuosity and highly interconnected pore structure. Compared with the commercial α-Al2O3 supports prepared by powder compaction and sintering, the halloysite nanotube-based mats (HNMs) show higher flux, better adsorption of zeolite seeds, adhesion of zeolite membranes and lower Al leaching. Four types of zeolite membranes supported on HNMs have been successfully synthesized with either in situ crystallization or a secondary growth method, demonstrating good universality of HNMs for supporting zeolite membranes.
研究领域:
材料科学
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纳米技术
·
膜科学
·
陶瓷
✓ 已验证
DOI
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 8.4
Devendra Sillu,Varenyam Achal
Biological CO 2 sequestration and storage as inert solid carbonates is a promising approach utilizing carbonic anhydrase. In present study, we report the synthesis of a magnetic carbonic anhydrase nanobiocatalyst using halloysite nanotubes (HNTs) as the backbone. Magnetic HNTs were functionalized with polydopamine (PDA) and polyethylenimine (PEI), followed by covalent enzyme immobilization via glutaraldehyde crosslinking. The nanobiocatalyst achieved 58.37 % enzyme loading with 63.58 % retained activity. Comprehensive characterization confirmed the effective anchoring of enzyme molecules on the surface of the functionalized magnetic HNTs. The nanobiocatalyst demonstrated superior stability across varying pH and temperature conditions compared to free carbonic anhydrase. It retained 65.2 % activity even after 10 weeks of storage and remained functional for 17 reuse cycles, indicating excellent operational stability. Additionally, the nanobiocatalyst exhibited enhanced catalytic efficiency and biomimetic CO 2 sequestration with reusability potential. This approach offers a significant improvement over conventional enzyme immobilization techniques by providing enhanced stability, reusability, and catalytic performance. The use of magnetic HNTs as a support allows for easy recovery and reuse, making this nanobiocatalyst highly suitable for industrial applications in carbon capture and storage. With its superior stability and performance, this system presents a promising strategy for future advancements in sustainable carbon management and green technology.
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiujuan Zhao,Yangyang Luo,Peixin Tan,Mingxian Liu,Changren Zhou
A high-performance oil-water separation device that built by environment-friendly materials is a promising strategy to solve water pollution problem. In this study, we developed an oil-water separation system with chitin/halloysite nanotubes (C/HNTs) composites. C/HNTs were crosslinked by epichlorohydrin and freeze-dried, then a porous sponge was formed. The C/HNTs sponge was modified to be hydrophobic via immersing into bromohexadecane ethanol solution. The surface structure, mechanical properties, microstructure, oil absorption and oil-water separation ability of the C/HNTs sponge were investigated. The addition of HNTs significantly increased the compressive strength of chitin sponge without influence on porous structure . IR spectra indicated the successful coating of bromohexadecane on the C/HNTs sponge surface, which enabled the hydrophobicity and lipophilicity of this construct. The inside construct of the C/HNTs sponges were full of interconnected pores, and the pore size ranged from 250 to 500 μm. The absorption capability for various oil and grease were measured, including methylbenzene, sunflower seed oil , carbon dichloride, n-hexane, chloroform and acetone. It is found that the total amount of chloroform absorbed by a C/HNTs sponge was ~11.23 times of the sponge's weight, and the absorption for hexane was ~3.94 times of the sponge's weight. The sponge also exhibited an excellent oil-water separation ability with as high as 98.7% separation efficiency. All the results suggested that the chitin/HNTs sponges with improved mechanical property would have a great potential in oil-water separation.
研究领域:
材料科学
·
环境工程
·
高分子化学
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纳米复合材料
·
分离技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Peng Fan,Shuonan Wang,Hao Liu,Libing Liao,Guocheng Lv,Lefu Mei
Design and preparation of nanostructured conducting polymers (CPs) is a very important research direction for high performance CPs-based supercapacitors (SCs). With hollow structure, high surface area, tunable surface properties and abundant resources, natural halloysite is a promising template agent for preparing new nanotubular-structure CPs. Here, nanotubular-structure polyaniline was successfully synthesized using natural tubular halloysite as hard template. The obtained tubular polyaniline presents high specific capacitance at various current density as electrode material for supercapacitors. After a facile carbon coating, the carbon coated tubular polyaniline shows high specific capacitance of 654 F g −1 at the current density of 1 A g −1 and excellent electrochemical stability with capacitance retentions ∼87% after 10000 cycles. This work may prove the feasibility of preparing high performance CPs-based nanostructure electrode materials for SCs application based on inexpensive natural clay minerals.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Hongjing Cheng,Zhaohua Yang,Feipeng Du,Hui Liu,Qiao Zhang,Yunfei Zhang
Recently, developing facile, cheap, and efficient nano‑silver catalysts for the reduction of waste 4-nitrophenol (4-NP) to useful 4-aminophenol (4-AP) has attracted more and more attention. In this study, a facile mechanical foaming method was used to fabricate Ag/halloysite nanotubes/polyvinyl alcohol sponges (Ag/Hal/PVA) for enhanced degradation of 4-NP. It included the preparation, morphology and composition characterization, and catalytic performance test of Ag/Hal/PVA. The morphology and composition of Ag/Hal/PVA were characterized by field emission scanning electron microscopy , Fourier transform infrared spectra , Raman spectra , X-ray photoelectron spectroscopy, thermo-gravimetric analysis, and XRD, respectively. BET and UV–vis spectrum measurements were used to test the adsorption and catalytic performance of Ag/Hal/PVA for 4-NP. The results showed that silver nanoparticles (AgNPs) were evenly distributed in the Hal/PVA sponge. Moreover, halloysite nanotubes (Hal) greatly improved the specific surface area and the loading capacity for AgNPs of the sponge due to the hollow tubular structure of Hal. The specific surface area of the Ag/Hal/PVA was about 1.62 m 2 /g. The obtained Ag/Hal/PVA exhibited a good catalytic activity and the apparent rate constant was 0.297 min −1 , and a good stability up to 5 cycles without a significant loss of its catalytic activity. This study provided a facile strategy for the development of cheap Ag/Hal/PVA sponges for high efficient reduction of 4-NP, which has potential application in the filed water treatment
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Biao Huang,Mingxian Liu,Zheru Long,Yan Shen,Changren Zhou
Sodium alginate (SA)/halloysite nanotubes (HNTs) composite hydrogels were successfully prepared by solution blending and cross-linking with calcium ions. HNTs can improve the physical properties and cytocompatibility of composite hydrogels. The static and shear viscosity of SA/HNTs solution increase by the addition of HNTs. FTIR suggests the presence of hydrogen bond interactions between HNTs and SA. The crystal structure of HNTs is retained in the composites as showed by the X-ray diffraction result. A porous structure with pore size of 100–250 μm is found in the hydrogels, which can provide a space for cell growth and migration. The compressive mechanical properties of composite hydrogels significantly increase compared to the pure SA hydrogel. The SA/HNTs composite hydrogels with 80% HNTs loading exhibit the compressive stress at 80% strain of 2.99 MPa, while the stress at 80% strain of pure SA hydrogel is only 0.8 MPa. The dynamic storage modulus of composite hydrogels also markedly increases with HNTs concentration. The differential scanning calorimetry endothermic peak area and swelling ratios in NaCl solution of the composite hydrogels decrease by the addition of HNTs. Preosteoblast (MC3T3-E1) culture results reveal that the SA/HNTs composites especially at relatively low HNTs loading show a significant increase in cells adhesion and proliferation compared to the pure SA hydrogel. All the results demonstrate that the SA/HNTs composite hydrogels show a promising application in bone tissue engineering.
研究领域:
材料科学
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生物医学工程
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组织工程
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2010
·Vol. 55
·期 22
·6857-6864
·
IF 3.325
Chao Yang,Peng Liu,Yongqing Zhao
Halloysite nanotubes/polypyrrole (HNTs/PPy) nanocomposites with coaxial tubular morphology for use as electrode materials for supercapacitors were synthesized by the in situ chemical oxidative polymerization method based on self-assembled monolayer amine-functionalized HNTs. The HNTs/PPy coaxial tubular nanocomposites were characterized with transmission electron microscope (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), electrical conductivity measurement at different temperatures, cyclic voltammetry (CV), and galvanostatic charge–discharge measurements. The coaxial tubular nanocomposites showed their greatest conductivity at room temperature and a weak temperature dependence of the conductivity from 298 K to 423 K. A maximum discharge capacity of 522 F/g after correcting for the weight percent of the PPy phase at a current density of 5 mA cm −2 in a 0.5 M Na 2 SO 4 electrolyte could be achieved in a half-cell setup configuration for the HNTs/PPy composites electrode, suggesting its potential application in electrode materials for electrochemical capacitors .
研究领域:
材料科学
·
电化学
·
纳米复合材料
·
储能
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Danyi Guo,Jiahui Chen,Kun Hou,Shouping Xu,Jiang Cheng,Xiufang Wen,Shuangfeng Wang,Chaoyun Huang,Pihui Pi
A superhydrophobic halloysite-based mesh was facilely prepared by spraying epoxy/hexadecyltrimethoxysilane-halloysite nanotubes (HDTMS-HNTs) on stainless steel mesh. The as-prepared mesh was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical contact angle meter (OCA). The HNTs modified by HDTMS not only enhanced surface roughness , but also endowed hydrophobicity of the mesh. The mesh, with a static water contact angle of 154° and a sliding angle of 1.5°, was applied to separate a series of oil-water mixtures, such as n-hexane-water, isooctane-water and petroleum ether-water, with high separation efficiency of over 98%. The mesh still kept separation efficiency approximately 98.5% even after 25 separation cycles for n-hexane-water mixture separation. More importantly, the mesh is durable enough to withstand heat, chemical and mechanical challenges, such as hot water, strong alkaline, strong acid and sand abrasion, and high hydrostatic pressure . The as-prepared mesh will be a promising material in oil-water separation, because of the simple, economical and easily scalable preparation method and the excellent separation performance in radical oil-water separation.
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
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Riwang Li,Yuhui Zhang,Zhen Lin,Qiqi Lei,Yi Liu,Xinyang Li,Mingxian Liu,Gang Wu,Simin Luo,Huajun Wang,Xiaofei Zheng,Lihua Li,Ningjian Ao,Zhengang Zha
Breast cancer is one of the frequently occurring malignant tumors in the world. Breast resection, high tumor recurrence rate and high dose chemotherapy cause great pain to patients. Is there a way to prevent tumor recurrence efficiently while promoting new tissue generation after tumor resection? Based on this, an injectable biocompatible thiolated chitosan (CSSH) hydrogel with pH-response was designed to be used for accurate treatment of tumor cells in the initial stage of tissue resection and for tissue reconstruction later. To improve the mechanical strength of hydrogels, reduce the toxic and side effects, and delay the release of doxorubicin (DOX), halloysite nanotubes (HNTs) were modified to obtain thiolated HNTs (HNTs-SH), then loaded DOX ( [email protected] ), and further cross-linked CSSH to form [email protected] /HNTs-SH Gel. The results showed that HNTs-SH can be evenly dispersed in the gel matrix, which improve the compressive strength of the hydrogels. In vitro DOX release experiments showed that the hydrogels were pH sensitive, DOX released slowly at normal physiological pH, but released quickly in the acidic microenvironment of tumors. Cell experiments showed that [email protected] /HNTs-SH Gel released DOX can be taken up by MCF-7, thereby effectively inhibited its growth. In vivo recurrence experiments showed that the carriers can reduce the toxic and side effects of DOX, and effectively inhibited the recurrence and repair the defect tissue after tumor resection. Therefore, the drug-loaded gel is expected to be used as a carrier for local accurate and effective drug release, especially for inhibiting recurrence and repairing defective tissues after tumor resection.
研究领域:
肿瘤学
·
材料科学
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Yunyan Wang,Xinbao Wang,Hongqi Ye,Kai Han
To impede the shuttle effect of lithium sulfur (Li S) batteries and improve the battery performance, carbon coated halloysite nanotubes (HNT@C) composites were synthesized and applied as sulfur host materials for Li S batteries. The unique one-dimensional tubular structure and abundant alumina-silicates components of HNT clay were synergistically utilized to physically confine and chemically adsorb lithium polysulfides , which could play important role to suppress the shuttle effect of polysulfides. Moreover, to solve the insulating issue of HNT, conducting carbon was deposited on the surface of HNT through polydopamine (PDA) coating and pyrolysis . The electrical conductivity of HNT@C host was thus significantly enhanced. As a result, the cycling stability and rate capability of the sulfur cathode were improved. In addition, the effect of carbon content on the properties of HNT@C composites and the electrochemical performance of the sulfur cathode were investigated. With carbon content of 3%, HNT@C hosted sulfur cathode delivered an initial discharge capacity of 922.7 mAh g −1 at current rate of 0.1C. Also, the capacity still retained about 82% after 500 cycles at 1C and the corresponding capacity decay is as low as 0.036% per cycle. This work can not only extend the application of HNT clay in energy storage but also provide a low-cost and promising HNT@C host material for advanced Li S batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Hui Li,Xiaohong Zhu,Hui Zhou,Shian Zhong
A novel hydrophobic organic–inorganic hybrid nanocomposite was prepared for sustained release of analgesic. Using enlarged halloysite nanotubes (EHNTs) as nanocontainer and organosilane (OS) as the hydrophobic layer, nanocomposite denote as EHNTs@OS was readily prepared with a mild reaction. Then the EHNTs@OS was characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, energy dispersive X-ray analysis, and high-performance liquid chromatography. The hydrophobic layer composed of tetraethoxysilane and octyltriethoxysilane made a difference on the wettability of the EHNTs@OS. It was proved that the nanocomposite exhibited excellent hydrophobicity with a water contact angle of 132°. Moreover, an enhanced capacity for adsorption (25%) and the sustained-release performance (100 h) of the EHNTs@OS toward IBU were demonstrated and it followed the power law kinetic model. In conclusion, the drug-release platform explored in this work is suitable for other drugs and shows further comprehensive application prospect.
研究领域:
材料科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）