CELLULOSE
·
2017
·Vol. 24
·期 7
·2861-2875
·
IF 3.417
Huang Biao,Liu Mingxian,Zhou Changren
Halloysite nanotubes (HNTs) were added to cellulose NaOH/urea solution to prepare composite hydrogels using epichlorhydrine crosslinking at an elevated temperature. The shear viscosity, mechanical properties, microstructure, swelling properties, cytocompatibility, and drug delivery behavior of the cellulose/HNT composite hydrogels were investigated. The viscosity of the composite solution increases with the addition of HNT. The compressive mechanical properties of composite hydrogels are significantly improved compared with pure cellulose hydrogel. The compressive strength of the composite hydrogels with 66.7% HNTs is 128 kPa, while that of pure cellulose hydrogel is only 29.8 kPa in compressive strength. Rheological measurement suggests the resistance to deformation is improved for composite hydrogels. X-ray diffraction and Fourier transform infrared spectroscopy show that the crystal structure and chemical structure of HNT are not changed in the composite hydrogels. Hydrogen bonding interactions between HNT and cellulose exist in the composites. A porous structure of the composite hydrogels with pore size of 200–400 μm was found by scanning electron microscopy. The addition of HNT leads to decreased swelling ratios in NaCl solution and pure water for the composite hydrogels. Cytotoxicity assays show that the cellulose/HNT composite hydrogels have a good biocompatibility with MC3T3-E1 cells and MCF-7 cells. Curcumin is further loaded into the composite hydrogel via physical adsorption. The curcumin-loaded composite hydrogels show a strong inhibition effect on the cancer cells. All the results illustrate that the cellulose/HNT composite hydrogels have promising applications such as anticancer drug delivery systems and anti-inflammatory wound dressings.
研究领域:
材料科学
·
药剂学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 9
·6489-6496
·
IF 1.483
Chen Yun-Xia,Li Ru-Chang,Zhang Yuan-Hu,Chen Xue-Gang,Ye Ying
Halloysite/MnFe2O4 nanocomposites have been proposed as a novel material which can be used in magnetic and electromagnetic applications. In this study, we fabricated two kinds of halloysite/MnFe2O4 nanocomposites. The XRD and TEM characterizations
suggested that ferrite nanoparticles were mainly adhered on the outer surface of HNTs (named as WMH) and in the inner wall (MH), respectively. Both MH and WMH were applied to adsorb methylene blue (MB) from aqueous solutions. The results indicated that both MH and WMH can remove more than
97% MB at a dosage of 2 g L−1 and initial MB concentration of 20 mg L−1. The adsorption processes by both nanocomposites fit pseudo-second-order kinetic model and Langmuir isotherm with correlation coefficient of >0.99. WMH (19.19 mg g−1)
shows slightly higher maximum adsorption capacity than MH (18.52 mg g−1), contradicts to the fact that the mesopore volume of MH is 30% larger than that of WMH. It can be reconciled by the strong bonding between the outer surface ferrite nanoparticles of WMH and the MB molecules,
which greatly enhanced the MB adsorption capacity. In addition, the dimethylamino groups of MB molecules were preferably removed, suggesting the MB degradation by the ferrite nanoparticles during adsorption. Furthermore, both WMH and MH can be easily magnetic separated and recycled. The MB
removal efficiency can be maintained at after regenerated for 5 times. Ascribed to the advantages of easily recycling and regeneration, low cost, and MB degradation, the halloysite-MnFe2O4 nanocomposites are potential environmental friendly adsorbents for removing organic
pollutants.
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
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Pengwu Zheng,Yuanyuan Du,Peter R. Chang,Xiaofei Ma
A supramolecular structure was initially formed between amylose and halloysite (HNT) simply by using a mechanical force. Subsequently, amylose acted as a template for the growth of TiO 2 nanoparticles. The thus-prepared amylose–HNT–TiO 2 composite was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analyses, and transmission electron microscopy (TEM). In comparison to its counterpart HNT-TiO 2 composite, the amylose–HNT–TiO 2 composite exhibited better dispersion, a larger specific surface area, and photocatalytic activity that was more effective for the photodegradation/removal of methylene blue (MB) and the persistent organic pollutant 4-nitrophenol (4-NP) under UV irradiation. After four successive UV irradiation treatments, amylose–HNT–TiO 2 removed about 90% of 4-NP or MB.
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
JOURNAL OF SEPARATION SCIENCE
·
2016
·Vol. 39
·期 12
·2431-2437
·
IF 2.741
Xiaohong Zhu,Hui Li,Hui Liu,Wei Peng,Shian Zhong,Yan Wang
We describe a facile, general, and highly efficient approach to obtain polydopamine-coated molecularly imprinted polymer based on halloysite nanotubes for bovine serum albumin. The method combined surface molecular imprinting and one-step immobilized template technique. Hierarchically structured polymer was prepared in physiological conditions adopting dopamine as functional monomer. A thin layer of polydopamine can be coated on the surface of amino-modified halloysite nanotubes by self-polymerization, and the thickness of the imprinted shells can be controlled by the mass ratio of matrix and dopamine. The polymer was characterized by Fourier transform infrared spectrometry, transmission electron microscopy, and thermogravimetric analysis. The prepared material showed high binding capacity (45.4 mg/g) and specific recognition behavior toward the template protein. In addition, stability and regeneration analyses indicated that the imprinted polymer exhibited excellent reusability (relative standard deviation < 9% for batch-to-batch evaluation). Therefore, the developed polymer is effective for protein recognition and separation.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Heqing Fu,Yin Wang,Weifeng Chen,Jing Xiao
Waterborne polyurethane/halloysite nanotubes nanocomposites were prepared by modified halloysite nanotubes (HTs) with chitosan (CS). Modified HTs were characterized by Fourier transform infrared spectroscopy, elemental analysis, and thermogravimetry, which verified that CS was successfully assembled onto the HTs surface. The chitosan-modified halloysite nanotubes (CHTs) were uniformly dispersed in WPU matrix through the reaction with polyurethane prepolymer, and acted as chain cross-linker as well as reinforcing filler, which increased the cross-linking density of nanocomposites. The experimental results showed that the strong interfacial interaction and hydrogen bonding interaction between CHTs and WPU improved the degree of micro-phase separation, thermal properties, mechanical properties and surface properties of nanocomposites. The tensile strength and elongation at break were simultaneously enhanced when the CHTs loading was below 2 wt%.
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
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Junming Zhou,Hongmei Liu,Dong Liu,Peng Yuan,Hongling Bu,Peixin Du,Wenxiao Fan,Mengyuan Li
Weathered crust elution-deposited rare earth (WED-RE) ores are important rare earth element (REE) resources around the world. In these ores, the REE are believed to mainly exist as exchangeable REE(III) ions on the surfaces of clay minerals, such as tubular halloysite and platy kaolinite . However, the mechanisms underlying the sorption and desorption of REE(III) ions on clay minerals in the environment of weathered crusts remain ambiguous. In this study, the sorption/desorption characteristics of Eu(III) ions onto halloysite and kaolinite were investigated. The results revealed that Eu(III) was adsorbed onto both clay minerals through inner-sphere complexation and outer-sphere complexation, where the former was the primary sorption mechanism. Halloysite displayed a higher sorption capacity for Eu(III) than kaolinite in a weakly acidic environment (pH 4–6). The desorption efficiency increased with the increasing concentration of NH 4 + ions. When the NH 4 + concentration was 0.002 mol/L, which is similar to the typical cation concentration of groundwater/rainwater, the amount and rate of Eu(III) desorption from halloysite were lower than those from kaolinite. The desorption of Eu(III) ions from the two clay minerals is proposed to be governed by the attraction between the outer-sphere complexes and clay minerals when the NH 4 + concentration is 0.002 mol/L. Therefore, halloysite has a higher sorption capacity and stronger retention capacity for Eu(III) than kaolinite, which suggests that halloysite may play a greater role in REE(III) enrichment in WED-RE ores than kaolinite owing to the similar chemical properties of REE(III) ions. The fundamental results obtained in this study afford new insights into the migration of REE and the role of clay minerals in REE enrichment during ore formation.
研究领域:
地质学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 44
·7204-7216
·
IF 4.776
Zheru Long,Yan-Ping Wu,Hua-Ying Gao,Jun Zhang,Xianfeng Ou,Rong-Rong He,Mingxian Liu
Because of their outstanding properties, increasing numbers of research studies and emerging applications for manufacturing products are currently in progress for halloysite nanotubes (HNTs). Therefore, the impact of HNTs on the environment and human health should be taken into consideration. In order to clearly show the cell uptake of HNTs and the biodistribution of HNTs in zebrafish, HNTs are labeled with fluorescein isothiocyanate (FITC-HNTs). The cytotoxicity assays showed that the cell viabilities of human umbilical vein endothelial cells (HUVECs) and human breast adenocarcinoma (MCF-7) cells were above 60% after being treated with different concentrations of HNTs (2.5–200 μg mL−1) for 72 h. Confocal laser scanning microscopy (CLSM) results showed the uptake of HNTs by HUVECs and MCF-7 cells. The in vivo toxicity of HNTs was then investigated in the early development of zebrafish embryos. The percent survival of zebrafish embryos and larvae showed no significant changes at different developmental stages (24, 48, 72, 96, and 120 hpf) when treated with various concentrations of HNTs (0.25–10 mg mL−1). Besides, HNTs could promote the hatchability of zebrafish embryos and did not affect the morphological development of zebrafish at a concentration of ≤25 mg mL−1. HNTs could also be ingested by zebrafish larvae and accumulated predominantly in the gastrointestinal tract. The fluorescence intensity of FITC-HNTs decreased gradually with time, which suggested that HNTs could be excreted by zebrafish larvae through the gastrointestinal metabolism. Therefore, it can be concluded that HNTs are relatively biocompatible nanomaterials, which can be utilized in many fields.
研究领域:
纳米技术
·
毒理学
·
环境科学
·
细胞生物学
·
发育生物学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2025
·
IF 5.8
Yihui Li,Chenyu Yan,Xiongbo Dong,Aidong Tang,Huaming Yang
Transition metal carbide-nitride heterojunctions have gained great attention in Li S batteries for overcoming the issues such as polysulfide dissolution, poor electrical conductivity of the cathode, and sluggish electrode reaction kinetics. However, precisely designing and synthesizing these potentially important materials is still challenging. Herein, a novel strategy that employs halloysite for MoC-MoN heterojunction with a precisely regulated interface (HNT/MoC-MoN) is proposed. The results show that halloysite surfaces abundant in hydroxyl groups can induce the formation of MoC-MoN heterojunction via enhancing charge transfer at the interface between halloysite and MoC-MoN. The optimized formation of the MoC-MoN heterojunction accelerates the electron migration and the conversion kinetics of lithium polysulfide (LiPSs). By optimizing the design, the synthesized HNT/MoC-MoN composite demonstrates excellent electrochemical performance in Li S batteries, achieving an initial specific capacity of 1100 mAh g −1 at 0.2C and maintaining a capacity of 605 mAh g −1 after 300 cycles. This work may provide valuable insights for the application of natural minerals in Li S batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yue Pan,Zhaoqi Zhu,Min Li,Yanjun Chen,Chenchen Cheng,Mingxing Wang,Hanxue Sun,An Li
The frequent occurrence of oil spill accidents and the massive discharge of oily wastewater have become serious environmental pollution problems. Herein, we report a facile and easy method for fabricating superhydrophobic halloysite-based aerogels (PDMS@HNCS) through mixing halloysite and chitosan without cross-linking agents. The as-prepared aerogel with an aligned tubular channel structure has low density (41.98–52.83 mg cm–3) and robust mechanical properties because of the directional freezing and freeze-drying method. The dip-coating method and heat treatment of the halloysite-based aerogels with PDMS endow them with superhydrophobic properties, which is beneficial for selective adsorption and separation of oil–water mixtures, and the contact angle with water of PDMS@HNCS aerogels can reach 151.4°. The adsorption capacity of the aerogel for various oils or organic solvents is 10.13–22.61 g g–1. Besides, the aerogel can separate various water-in-oil emulsions with high separation efficiencies of up to 99.90%. Overall, clay-based aerogels have gradually attracted attention in the field of oil–water separation owing to their low density, good absorption properties, and biocompatibility, and this work may develop a new approach to fabricating materials for efficient oil–water separation by using a simple method and low-cost materials.
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
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jian Lu,Hui Lin,Ruijin Hong,Dawei Zhang
By the solid phase reaction method, pure KNN and KNN with different proportions halloysite nanotubes (HNTs) were prepared to study the photocatalytic hydrogen evolution performance under the UV light irradiation. The band gaps of KNN with HNTs are narrower than that of pure KNN. The absorbance of KNN in the ultraviolet region is significantly enhanced by the incorporation of HNTs, where the absorbance in the 200-300 nm region increased about 2 times. Compared with KNN, the conduction band edge of KNN-5wt%HNTs reduced from −1.13 eV to −1.18 eV, showing stronger reducing ability. The H 2 production rate of KNN with HNTs is much higher than that of the raw KNN without HNTs. The best H 2 production rate of KNN-5wt%HNTs is 31.28 μmol•g −1 •h −1 , approximate 4.48 times as high as the rate of pure KNN (6.98 μmol•g −1 •h −1 ), suggesting appropriate addition of HNTs can efficiently improve the H 2 production efficiency.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Kairui Tian,Xiangyu Chen,Xinyuan Zhou,Yuqian Xu,Mingxian Liu
Tea, as one of the three major beverages in the world, has antioxidant, anti-cancer, inhibitory inflammation, immune regulation, diabetes prevention, antibacterial and other effects. In this study, black tea and FeCl 3 ·6H 2 O were chelated to functionally modify the outer surface of halloysite clay nanotube (Hal). A new nanomaterial with excellent photothermal properties, tea nanoparticles@Hal, was successfully synthesized. Tea nanoparticles@Hal powder can raise to 225.8 °C in 25 s, and the corresponding solution can raise to 50.5 °C in 8 min with a photothermal efficiency of 77.3 %. The tea nanoparticles@Hal was assembled on the polyurethane (PU) sponges by simply soaking to prepare conductive sensor. The flexible sensor shows a fast response time (132.8 ms) and a long service time (400 cycles), which have wide range of applications. The resistance changes with the pressure is in a regular functional relationship, and the sensor can measure the weight of objects with high accuracy. In addition, the sensor can stably monitor various physiological activities of the human body. When finger is bent, the sensor can produce the difference output signals. The prepared tea nanoparticles@Hal/PU sensor has broad prospects in fields such as human-computer interaction and medical detection.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jing Zhang,Qinfu Liu,Mingyi Huang
Halloysite is a natural aluminum-rich nano-sized clay mineral, which can offer the aluminum source to synthesize aluminum nitride (AlN) in a low-cost and environmentally friendly manner. The micron-sized AlN with different morphology and structure, including self-assembled pine-like aggregates, hollow bayberry-like spheres, and high aspect ratio whiskers, were successfully synthesized at 700 °C under nitrogen atmosphere using natural hydrated halloysite (10 Å HNT). These three kinds of varying morphological AlN formed by different mechanism. The self-assembled-AIN pine-like aggregates formed by in-situ nitrogen substitution within the Al-O octahedra of 10 Å HNT thermal fragmentation through self-assembly. The formation of the bayberry-like hollow spheres is governed by a gas–liquid reaction pathway, whereas the development of whiskers with a high length-to-diameter ratio is driven by a gas–liquid-solid mechanism. The morphological comparison of AlN synthesized from 10 Å HNT with 7 Å HNT further confirms the validity of the in-situ substitution mechanism we previously proposed, as well as reflecting the critical influence of halloysite hydration state on structural evolution of AlN. This study offers a new insight into tailoring AlN nanostructures using clay mineral templates, with promising applications in thermally conductive composites and electronic packaging materials.
研究领域:
材料科学
·
无机非金属材料
·
纳米结构材料
·
陶瓷材料
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）