Nanomaterials and Nanotechnology
·
2015
·
IF 0.857
Tingting Yang,Mingliang Du,Ming Zhang,Han Zhu,Pan Wang,Meiling Zou
A simple and effective method for the preparation of platinum nanoparticles (Pt NPs) grown on amino-functionalized halloysite nanotubes (HNTs) was developed. The nanostructures were synthesized through the functionalization of the HNTs, followed by an in situ approach to generate Pt NPs with diameter of approximately 1.5 nm within the entire HNTs. The synthesis process, composition and morphology of the nanostructures were characterized. The results suggest PtNPs/NH2-HNTs nanostructures with ultrafine PtNPs were successfully synthesized by green chemically-reducing H2PtCl6 without the use of surfactant. The nanostructures exhibit promising catalytic properties for reducing potassium hexacyanoferrate(III) to potassium hexacyanoferrate(II). The presented experiment for novel PtNPs/NH2-HNTs nanostructures is quite simple and environmentally benign, permitting it as a potential application in the future field of catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 38
·期 8
·1365-1371
·
IF 2.737
Chengyun Zhou,Huan Li,Hui Zhou,Hui Wang,Pengjie Yang,Shian Zhong
A water-compatible molecularly imprinted polymer was prepared by Pickering emulsion polymerization using halloysite nanotubes as stabilized solid particles. During polymerization, we used 4-vinylpyridine as monomer, divinylbenzene as cross-linking agent, toluene as porogen, 2,2-azobisisobutyronitrile as initiator, 2,4-dichlorophenoxyacetic acid as template to form the oil phase, and Triton X-100 aqueous solution to form the water phase. The halloysite nanotubes molecularly imprinted polymer was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Kinetic and equilibrium bindings were also employed to evaluate the adsorption properties of the imprinted polymer. The imprinted polymer showed better selectivity, more rapid kinetic binding (60 min) for 2,4-dichlorophenoxyacetic acid in pure water compared with rebinding in toluene. The imprinted polymer was used as a sorbent to enrich and separate 2,4-dichlorophenoxyacetic acid from water, and was detected by high-performance liquid chromatography with UV detection.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xinyi Wan,Yingqing Zhan,Guangyong Zeng,Yi He
To develop high-performance halloysite nanotube (HNT)-based nanocomposites, the two key issues need to be considered: precise interface control and the dispersal of HNTs. This study presents an efficient way to functionalize halloysite nanotubes with 3-aminophenoxy-phthalonitrile, followed by compounding with poly(arylene ether nitrile) (PEN), to prepare functional nanocomposite films. The surface functionalization of HNTs was characterized and confirmed by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Compared with neat PEN, the tensile strength and modulus of the resulting PEN nanocomposites with 3 wt% functionalized HNTs were found to increase by 25.7% and 20.7%, respectively. The good dispersion and high capacitance of the dielectric layer resulted in PEN/HNTs nancomposites with enhanced dielectric permittivity and relatively low dielectric loss. Moreover, the addition of functional HNTs greatly improved the thermal stability of PEN, which could be further enhanced through the chemical cross-linking reaction between the functional HNTs and the PEN matrix. This work provides a new path toward obtaining advanced polymer-based nanocomposites with functional properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Fan Wu,Jingqi Zheng,Zhixiong Li,Mingxian Liu
Three-dimensional (3D) printed polymer scaffolds can build engineered tissue constructs with complex and hierarchical structures, mechanical and biological heterogeneity. However, the interactions between the scaffolds and cells should be optimally designed for their practical application. In this work, 3D printed polylactic acid (PLA) pattern was functionalized by a polydopamine (PDA) interlayer to firmly bond the halloysite nanotubes (HNTs) on the surfaces of the PLA pattern for guiding cell orientation. A series of 3D printed PLA patterns with different stripe widths were characterized by scanning electron microscopy (SEM), polarized light microscopy (POM), 3D optical profiler and so on. The successful introduction of HNTs on PLA pattern was verified by field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), water contact angle (WCA), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analyzer (TGA). The HNTs coating could effectively improve roughness and hydrophilicity of PLA pattern. In addition, in vitro human mesenchymal stem cells (hMSCs) culture experiments suggested that 3D printed PLA patterns with different strip widths exhibited different ability to induce cell orientation. The smaller the stripe width of the PLA pattern, the more suitable for cell orientation. When the layer height was set to 0.05 mm, the effect of inducing cell orientation was optimal. Meanwhile, the 3D printed PLA pattern with HNTs coating was more suitable for the adhesion and proliferation of cells. This works provides a general routine for improving the cell affinity of 3D printed PLA structure by the simple coating of nanoparticles, which shows the promising application in cell culture scaffolds, wound healing materials, and biosensors.
研究领域:
生物材料
·
组织工程
·
细胞生物学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Jian Wang,Shengyu Wu,Wenjing Zhang,Hongchao Wang,Peiping Zhang,Bo Jin,Cundi Wei,Ruifeng Guo,Shiding Miao
Threats of bacterial infection represent one of the most persistent issues of public health, and efficient bacteria killing materials are to be developed. Taking inspirations from nature, a new class of halloysite (Hal)-based bacteria killing materials (MnO x -Ag/Hal) that were able to self-move in aqueous solution was prepared. The asymmetric halloysite tubes are used as substrates. Silver (Ag) nanoparticles are loaded both in the lumen and on the external surface, and manganese oxide (MnO x ) was distributed on the outside walls. Fuel with low concentration of H 2 O 2 , the catalyst Ag and MnO x would decompose H 2 O 2 into gas bubbles (O 2 ), and the back-thrust bubbles provided forward forces for jet movement, which improved the antibacterial efficiency. The fabricated MnO x -Ag/Hal exhibited powerful self-propelled motion with velocity of 18 ± 4 μm/s achieved at 0.2 wt% H 2 O 2 . The MnO x -Ag/Hal generated Ag + ions and highly reactive oxygen species that could efficiently kill E. coli. By coupling the antibacterial capabilities of H 2 O 2 , Ag and highly reactive oxygen species with powerful self-propulsion, the prepared micromotors were capable of killing 97% of E. coli within 2.0 min, which was threefold as the counterpart of MnO x -Ag/Hal in the absence of H 2 O 2 that cannot move efficiently. The biocompatible micromotors offered an encouraging strategy for rapid bacteria killing in clinical and environment fields.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Jingru Guan,Jinze Li,Zhefei Ye,Dongyao Wu,Chongyang Liu,Huiqin Wang,Changchang Ma,Pengwei Huo,Yongsheng Yan
A series of La 2 O 3 /CeVO 4 @halloysite nanotubes composites were successfully fabricated by the hydrothermal method. The La 2 O 3 /CeVO 4 @halloysite nanotubes composites display outstanding photocatalytic activity for removing tetracycline (TC) solution under visible light irradiation (λ ≥ 420 nm). After irradiation 60 min, an optimized La 2 O 3 /CeVO 4 @halloysite nanotube composite exhibited a high photocatalytic activity (87.1%), which is 3.89 times higher than that of raw CeVO 4 (22.4%). The improvement of ternary composites performance is attributed to the Ce 3+ and Ce 4+ pairs in CeVO 4 . Besides, constructing heterojunctions between La 2 O 3 and CeVO 4 can inhibit the recombination of photoinduced electrons and holes, which is ascribed to the La 3+ as electron trap to enhance the charge transfer. According to the trapper experiments and Electron Spin Resonance (ESR) analysis, the h + and •O 2− are major reactive species during the degradation. In addition, the oxygen vacancies are in the ternary photocatalyssts. The photocatalytic degradation intermediates of the solution were identified by High performance liquid chromatography-Mass spectra (HPLC-MS).
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 67
·38935-38942
·
IF 3.049
Liting Zhang,Wen Tang,Tonghao Ma,Lina Zhou,Chenggong Hui,Xiaoli Wang,Ping Wang,Changai Zhang,Chao Chen
Halloysite nanotubes (HNTs) have been pursued as promising carriers for enzyme immobilization, but the lack of functional groups severely limits their applications. Herein, we reported a simple tannic acid (TA)-mediated surface modification strategy for the fabrication of HNT-based efficient enzyme immobilization supports. Particularly, TA was first self-polymerized and deposited onto the surface of HNTs to form a thin active film via a mussel-inspired method, and the model enzyme laccase was directly conjugated via the Michael addition and/or Schiff base condensation between quinone groups on poly(tannic acid) layer surfaces and exposed amine groups on laccase surfaces. Under the optimum conditions, this newly fabricated support retained good enzyme-loading and activity recovery properties with 197.9 mg protein per gram of support and 55.4% of activity recovery being achieved. In addition, this immobilized laccase was less influenced by pH, temperature, and inhibitor changes and exhibited higher storage stability than free laccases as more than 70% of initial activity was retained by the immobilized laccase, while less than 30% was retained for free laccase after one-month storage at 4 °C. Finally, a higher bisphenol-A (BPA) removal efficiency and more reuse cycles were demonstrated for immobilized laccases. As a result, this TA-mediated surface modification is a simple and green method for biological macromolecule immobilization on HNTs in one step.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
生物催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Changkai Yang,Yanping Huang,Nianhua Dan,Yining Chen
Introducing nanomaterials is an effective strategy for enhancing the mechanical properties of collagen (COL) composite membranes. In this work, we obtained a carboxylated halloysite nanotubes (HNTs) nanomaterial by grafting a macromolecular substance polyglutamic acid (γ-PGA) on the surface of HNTs, which was coblended with collagen matrix to obtain a collagen-based composite membrane with good mechanical properties under the cross-linking effect of sodium alginate oxide (ADA). We investigated that the γ-PGA-grafted HNTs have the potential to improve and enhance the tensile strength and elongation at the break of the collagen membranes. A study of contact angle of composite membranes revealed the γ-PGA-grafted HNTs inhibited the negative effects of HNTs on the hydrophilicity of the COL-ADA membrane. The biological properties of carboxylated HNTs composite-modified collagen-sodium alginate oxide composite membrane (COL-c-ADA) were evaluated in vivo and virto. Polyglutamic acid-grafted HNTs composite-modified collagen-sodium alginate oxide composite membrane material is nontoxic and can promote cell proliferation and migration to promote wound healing.
研究领域:
生物材料学
·
医学工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Chengbao Liu,Peimin Hou,Bei Qian,Xiaoping Hu
Integrating healable and reportable ability to sustain new-generation smart anticorrosion coatings with long-term durability is highly desirable to accommodate the development of marine industries. Herein, a new type of dual-function coating is designed to fulfill the needs. Through introducing the smart nanocontainers based on the core of HNTs loaded with 8-hydroxyquinoline (8HQ) and the shell made from sodium tripolyphosphate-chitosan (CS) into conventional epoxy matrix, the smart healable and reportable anticorrosion coating on carbon steel (Q235) was developed. Electrochemical impedance spectroscopy (EIS) and salt spray measurement indicated the corrosion inhibition effect of the nanocontainers and healable performance of composite coatings. Benefitting from the 8HQ, the designed waterborne epoxy coating displayed higher low-frequency modulus after 60 days of immersion, confirming the long-term protection ability. Besides, the composite coating exhibited obvious dark-green color at damaged region to timely sense and report the local corrosion in 30 min of immersion tests. This smart coating with sensitive corrosion visualization and well-performed healable properties holds great potential in actual anticorrosion fields.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 51
·77131-77144
·
IF 5.19
Yu Jiexuan,Zhang Kegang,Duan Xuelei,Zhao Changxian,Wei Xiaoyang,Guo Qi,Yuan Chun-Gang
This work aims at exploring a novel environment-friendly nanomaterial based on natural clay minerals for arsenic removal in aqueous samples. Halloysite nanotubes (HNTs) were selected as the substrate with Mn oxides loaded on the surface to enhance its arsenic adsorption ability and then grafted onto the SiO 2 -coated Fe 3 O 4 microsphere to get a just enough magnetic performance facilitating the material’s post-treatment. The prepared composite (Fe 3 O 4 @SiO 2 @Mn-HNTs) was extensively characterized by various instruments including Fourier transform infrared spectroscope (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric analysis (TG), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscope (XPS), and X-ray diffraction (XRD). Batch experiments were carried out to get the optimum test conditions for arsenic adsorption by the composite, including pH, loading amount of Mn oxides, adsorbent dosage, and the co-existing ions. The adsorption of As III and As V on Fe 3 O 4 @SiO 2 @Mn-HNTs were both well fitted with the pseudo-second-order kinetic model as well as the Langmuir adsorption isotherm model revealing the chemisorption between arsenic and Fe 3 O 4 @SiO 2 @Mn-HNTs. The adsorption process of As III and As V were both endothermic and spontaneous displayed by the thermodynamic study. The capacities of the prepared composite are 3.28 mg g −1 for As III and 3.52 mg g −1 for As V , respectively, which are comparable or better than those of many reported materials in the references. Toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) tests were carried out to access the secondary environmental risk of the composite and showed that it was quite environmentally stable and can be safely disposed. The composite was successfully applied in environmental water samples indicating its great potential applicability in future.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yan Li,Shen-Hui Li,Li-Hao Xu,Heng Mao,Ao-Shuai Zhang,Zhi-Ping Zhao
The development of high-performance polydimethylsiloxane (PDMS)-based mixed matrix membranes (MMMs) for the recovery of ethyl acetate (EtAc) from low-concentration aqueous solutions remains a challenge in the pervaporation field. In this study, ionic-liquids-decorated halloysite nanotubes (ILs@HNTs) composites, which were precisely designed and prepared using a tandem modification strategy, were embedded into PDMS matrix to fabricate MMMs for the permselective pervaporation of EtAc. The results revealed that the ILs incorporated within the lumens and onto the external surfaces of HNTs not only exhibited excellent compatibility with PDMS, but also created permselective diffusion channels for EtAc. Benefit from the synergistic effect of highly permeable HNTs lumens and highly selective ILs, the resultant MMM loaded with 15 wt% ILs@HNTs presented a remarkable separation factor (341) and high flux (925 g m −2 h −1 ) for the separation of 1 wt% EtAc aqueous solutions at 30 °C. These values were 2.10 and 1.45 times higher, respectively, than those of pristine PDMS membranes. Furthermore, the molecular simulations conducted to analyze the permeation behavior of guest molecules in the HNTs lumens provided theoretical support for the pervaporation experimental results. Moreover, the effects of ILs grafting degree, filler loading, feed temperature, and feed concentration on the pervaporation performance of the fabricated MMMs were systematically investigated. The unique modification method developed in this study can be expanded to other tubular materials and provide valuable guidelines for designing high-performance membrane structures.
研究领域:
化学工程
·
材料科学
·
膜技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Bohao Cheng,Yifan Wang,Xiaowen Wu,Minghao Fang,Xin Min,Zhaohui Huang,Yan'gai Liu,Ruiyu Mi
In this study, the electrospun polyacrylonitrile (ePAN) fiber mats were used as support layer and natural mineral-halloysite nanotubes (HNTs) was used to construct the interlayer. Polydopamine modification was utilized to enhance the hydrophilicity of ePAN substrates and dispersibility of HNTs. The mHNTs interlayer effectively minified the surface pore size of substrates providing a better interface for interfacial polymerization forming an integrated and thin PA selective layers. Compared to the unmodified membranes, the water flux of the optimized membrane with mHNTs interlayer about 61.60% and 79.70% higher and the reverse salt flux of which was 38.95% and 45.08% lower in AL-FS mode and AL-DS mode respectively. These results suggested that introducing halloysite nanotube interlayer is an effective, and low-cost way to fabricate high-performance FO 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
危险品化学品经营许可证（带存储）