Extreme Mechanics Letters
·
2018
·
IF 0
Xin Wang,Bin Han,Run-Pei Yu,Fei-Chen Li,Zhen-Yu Zhao,Qian-Cheng Zhang,Tian Jian Lu
Fe 3 O 4 nanoparticle-infiltrated chromatography paper is prepared using a low-cost blending method. Upon characterizing the basic material properties of the Fe 3 O 4 /paper nanocomposite , beam-, accordion- and star-shaped actuators are constructed using the nanocomposite and the corresponding actuation performance is investigated experimentally. The beam-shaped actuator exhibits a reversible flexural deformation due to low magnetic hysteresis loop of the Fe 3 O 4 /paper nanocomposite, maintaining a stable response after 100 cycles. The accordion-shaped actuator can reach a maximum strain of 100% while the star-shaped actuator can capture a spitball twice heavier than itself.
研究领域:
材料科学
·
智能材料
·
纳米技术
✓ 已验证
产品关联
DOI
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiaoyu Wang,Yan Zhao,Huanchen Liu,Bo Dai,Xiaobo Wang,Wenjing Lou,Jun Yang
Solvent-free nanofluids were synthesized by grafting an organic oligomer shell onto the nanomaterial core, demonstrating significant liquid flow behavior at room temperature without any solvents. The synergistic effect within the solid–liquid combination found in solvent-free nanofluids positions them as potential lubricant candidates. In this study, solvent-free MXene@Fe3O4 nanofluids (MXene@Fe3O4 NFs) were successfully synthesized by loading Fe3O4 nanoparticles in situ onto MXene nanosheets, followed by covalent grafting with a silane coupling agent and a flexible long-chain polyetheramine. Its magnetic response properties were then assessed, highlighting its potential for recyclability. The tribological performance of MXene@Fe3O4 NFs as lubricants was examined under varying operating conditions with a focus on the morphology and chemical composition of the worn surface to elucidate the lubrication mechanism. The results reveal that MXene@Fe3O4 NFs, compared to MXene NFs and Fe3O4 NFs, exhibit optimal tribological performance. Additionally, even under severe loads, temperatures, or frequencies, MXene@Fe3O4 NFs show superior friction-reduction and wear-resistant properties. This phenomenon can be attributed to the fluidity endowed by the organic shell layer coupled with the synergistic tribological effects between MXene nanosheets and Fe3O4 nanoparticles. As solid–liquid lubricants with magnetic responsivity, MXene@Fe3O4 NFs present an effective strategy for high-performance lubricants synthesis.
研究领域:
材料科学
·
纳米技术
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Hailong Peng,Mei Luo,Hua Xiong,Ningxiang Yu,Fangjian Ning,Jieping Fan,Zheling Zeng,Jinhua Li,Lingxin Chen
Photonic-magnetic responsive molecularly imprinted microspheres (PM-MIMs) were prepared by seed polymerization, through suitable functionalization of magnetic nanoparticles for further coating with photoresponsive functional monomer and imprinted layers, and then were successfully applied to the fast and selective extraction of 17β-estradiol (17β-E 2 ) from real samples. The PM-MIMs possessed a sandwich micro-spherical structure containing Fe 3 O 4 core, SiO 2 middle layer, and MIPs shell with thickness of 25 nm. The PM-MIMs displayed excellent photoresponsive properties and could be rapidly separated from solutions under an external magnet. The PM-MIMs had specific affinity towards 17β-E 2 with high adsorption capacity ( Q max = 0.84 mg g −1 ) and fast binding kinetics ( K d = 26.08 mg L −1 ). The PM-MIMs proved to be an ideal photoswitch with the ability of reversible uptake and release of 17β-E 2 upon alternate 365 and 440 nm irradiation: 45.0% of 17β-E 2 released from the PM-MIMs upon 365 nm irradiation, and 94.0% of the released 17β-E 2 was rebound to the PM-MIMs at 440 nm. Accordingly, the PM-MIMs were applied for fast separation and extraction of 17β-E 2 followed by HPLC-UV determination, presenting the low limit of detection (LOD, S/N = 3) and quantification (LOQ, S/N = 10) of 0.18 and 0.62 μmol L −1 , respectively. The high recoveries for spiked milk powder and drinking water samples were in the range of 97.5–113.0% with relative standard deviations less than 4.4%. This study reasonably combined photonic response, magnetic separation and surface imprinting, which endowed the PM-MIMs with significant advantages of high adsorption capacity and fast binding kinetics, convenient separation and recycled use, and simple rapid eco-benign adsorption/elution processes for template molecules. Thus, the PM-MIMs based method may be a simple, rapid, convenient, cost-effective and environmentally-friendly way for simultaneous separation, enrichment and detection of trace 17β-E 2 in complicated matrices.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yaping Li,Longyu Bai,Jie Fu,Shixu Li,Huijun Liang,Zhiyang Yin,Song Qi,Miao Yu
In the realm of safety protection, there is a critical demand for materials capable of superior energy absorption and adaptability across diverse application scenarios. Here, this study presents integrated two-phase negative Poisson’s ratio (NPR) composites with adjustable mechanical properties sensitive to magnetic field, temperature and impact load. It is achieved by substituting the vacancy of re-entrant structures (frame phase) with soft paraffin/magnetorheological plastomer (MRP) fillers (matrix phase). The paraffin/MRP exhibits temperature-sensitive properties, enhanced magnetorheological (MR) effect (up to 4178%) and shear thickening (ST) effect (up to 2365%). Through quasi-static compression and dynamic impact tests, the composites demonstrate remarkable adaptability in impact resistance. Specifically, the first peak force exhibits responsiveness to changes in magnetic flux density, temperature, and impact velocity, with respective variations of 80.6%, 68.2%, and 30.3%. The design strategy paves the way for tunable impact resistant materials with potential for extreme environment buffering applications.
研究领域:
材料科学
·
力学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhen Han,Yang Li,Xinjun Wu,Jiawei Zhang
Remotely controllable soft actuators have promising potential applications in many fields including soft robotics, exploration, and invasion medical treatment. Shape memory polymers could store and release energy, resulting in shape deformation, and have been regarded as promising candidates to fabricate untethered soft robots. Herein, an untethered and battery-free soft navigator and gripper based on a shape memory hydrogel is presented. The shape memory hydrogel is obtained through hydrogen bonding between gelatin and tannic acid, and the hydrogel displays excellent shape memory properties on the basis of hydrogen bonding and the coil–triple helix transition of gelatin. Moreover, Fe3O4 nanoparticles are introduced to endow the hydrogel magnetic responsiveness and photothermal conversion capacity. Finally, the shape memory hydrogel in a stretched state is assembled with an inert hydrogel to achieve a bilayer hydrogel actuator, which could produce complex shape transformation due to the shape recovery of the shape memory layer induced by heat or light. Taking advantage of the magnetically control and light-responsive shape deformation, remotely controllable soft grippers that could navigate through tortuous paths and grasp objects from a hard-to-reach place have been accomplished. This approach will inspire the design and fabrication of novel shape memory hydrogels as remotely controllable soft robots.
研究领域:
材料科学
·
软体机器人学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 10
·6131-6138
·
IF 9.3
Yan Wang,Xuan Wang,Yonghao Dong,Mingli Peng,Lina Guo,Mengyao Cui,Yuan He,Jiabao Yi,Huijun Ma,Huan Zhang,Haiming Fan
The selective oxidation of alcohols has drawn significant attention in heterogeneous catalysis with the increasing use of Pickering interfacial catalysis (PIC) for green transformations of alcohols. However, it is still highly desirable to design and develop a solid catalyst with easy separation and recycling, made from abundant resources through a simple synthesis route, for the selective oxidation of alcohols. In this study, ferrite nanoparticles, synthesized via a hydrothermal process, were employed to act as a stabilizer and catalyst in PIC for the oxidation of benzyl alcohol using H2O2. The ferrite nanoparticles exhibited higher catalytic performance in PIC than in acetonitrile. The turnover number (TON) of the nanocatalyst in PIC was found to be 1.5–4 times higher than that in acetonitrile, and the reaction constant in PIC (kPIC = 0.712 h−1) was almost twice that in acetonitrile (kCH3CN = 0.310 h−1) for MnFe2O4 nanoparticles. Moreover, other alcohols could also be oxidized with moderately high conversion and selectivity in PIC. Significantly, the ferrite nanocatalyst could be easily separated from PIC using a magnet for reuse, achieving 88% BzOH conversion after five cycles. The use of hazardous organic solvents was avoided in PIC, making it a more advanced, green and sustainable reaction system.
研究领域:
化学工程
·
催化科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Yanqin Wang,Yaping Zhu,Yanan Xue,Jinghui Wang,Xiaona Li,Xiaogang Wu,YiXian Qin,Weiyi Chen
It has great significance to develop a convenient and efficient method for hydrogels with adjustable electric and magnetic properties, which can be used in human activity monitoring and personal healthcare diagnosis field. However, it is a big challenge to balance the relationship between the conductive and magnetic categories so that electromagnetic hydrogels could be developed by an in-situ fabrication way. In this work, we firstly proposed a sequential in-situ route to form polypyrrole (PPy) and Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) in sequence within polyvinyl alcohol (PVA) matrix for the hybrid hydrogels with decent mechanical, conductive, and magnetic properties simultaneously, named as Fe 3 O 4 /PPy/PVA hydrogel. The as-prepared hybrid hydrogels exhibited continuous electrons transporting path and magnetic responsive properties. Specifically, a unique combination of high electrical conductivity (up to 1.95 ± 0.17 E −4 S cm −1 ), saturation magnetization (5.42 emu g −1 ) and greatly enhanced mechanical properties (tensile strength up to 575.03 ± 28.32 kPa, elasticity modulus up to 461.19 ± 24.75 kPa). More importantly, these hybrid hydrogels demonstrated potential applications in biomedical electronic devices, such as strain sensors and magnetic navigators.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiaojing Su,Hongqiang Li,Xuejun Lai,Lin Zhang,Xiaofeng Liao,Jing Wang,Zhonghua Chen,Jie He,Xingrong Zeng
Superhydrophobic surfaces with tunable adhesion from lotus-leaf to rose-petal states have generated much attention for their potential applications in self-cleaning, anti-icing, oil–water separation, microdroplet transportation, and microfluidic devices. Herein we report a facile magnetic-field-manipulation strategy to fabricate dual-functional superhydrophobic textiles with asymmetric roll-down/pinned states on the two surfaces of the textile simultaneously. Upon exposure to a static magnetic field, fluoroalkylsilane-modified iron oxide (F-Fe3O4) nanoparticles in polydimethylsiloxane (PDMS) moved along the magnetic field to construct discrepant hierarchical structures and roughnesses on the two sides of the textile. The positive surface (closer to the magnet, or P-surface) showed a water contact angle up to 165°, and the opposite surface (or O-surface) had a water contact angle of 152.5°. The P-surface where water droplets easily slid off with a sliding angle of 7.5° appeared in the “roll-down” state as Cassie mode, while the O-surface was in the “pinned” state as Wenzel mode, where water droplets firmly adhered even at vertical (90°) and inverted (180°) angles. The surface morphology and wetting mode were adjustable by varying the ratios of F-Fe3O4 nanoparticles and PDMS. By taking advantage of the asymmetric adhesion behaviors, the as-fabricated superhydrophobic textile was successfully applied in no-loss microdroplet transportation and oil–water separation. Our method is simple and cost-effective. The fabricated textile has the characteristics of superhydrophobicity, magnetic responsiveness, excellent chemical stability, adjustable surface morphology, and controllable adhesion. Our findings conceivably stand out as a new tool to fabricate functional superhydrophobic materials with asymmetric surface properties for various potential applications.
研究领域:
材料科学
·
表面工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Qinya Wang,Yu Tang,Lexuan Wu,Weiwei Xu,Yinghua Shen,Lijuan Shi,Sheng Dai
Thermal and magnetic dual-responsive l -proline nanohybrids ( l -Pro-based-TMNHs) were prepared by grafting thermal-responsive thiol-terminated P(NIPAM- co - l -ProlA)- b -POEGA-SH (PNLPO-SH) to vinyl-functionalized Fe 3 O 4 @SiO 2 -MPS through the thiol-ene click chemistry. The catalytic activity, selectivity and recyclability of l -Pro-based-TMNHs were evaluated in a model asymmetric aldol reaction of cyclohexanone and 4-nitrobenzaldehyde in water. Thermal responsiveness of the l -Pro-based-TMNHs induced self-assembly to produce a hydrophobic microenvironment in aqueous medium for catalyzing asymmetric aldol reaction. The catalytic performance can be tuned by the molar ratio of PNLPO-SH to Fe 3 O 4 @SiO 2 -MPS, and l -Pro-based-TMNHs-2 with a ratio of 1:6 exhibited best catalytic activity and selectivity. At 50 °C and 5 mol% catalyst loading, 94% conv., 81/19 anti / syn and 95% ee were obtained. On the other hand, magnetic responsiveness of the l -Pro-based-TMNHs facilitates catalyst separation and reuse in the presence of an external magnetic field , and these results indicated no loss of both catalytic activity and selectivity associated with the course of recycling.
研究领域:
化学
·
材料科学
·
催化领域
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215606
·
IF 3.551
Haifeng Niu,Jianbo Li,Xuefang Wang,Zhe Qiang,Jie Ren
We demonstrated a simple approach for fabricating Au–Fe3O4/PDA hollow nanoparticles as high-performance catalysts for water purification. The polydopamine (PDA) shell was in situ formed on the silica surface from self-polymerization, which acts as a medium support for coupling with metal ions (for Fe3O4 nanoparticle deposition) as well as a reducing agent and stabilizer for Au nanoparticle reduction and deposition. A step of simultaneous Fe3O4 nanoparticle deposition and silica core removal under alkaline conditions is first introduced in this study. This process significantly simplifies previous strategies which typically require the use of poisonous agents such as hydrogen fluoride or additional complicated post-treatment steps. Under optimized conditions, the Au–Fe3O4/PDA hollow nanoparticles show a high saturation magnetization of 18.8 emu g−1 and an excellent catalytic performance for the rapid reduction of p-nitrophenol with the reaction kinetic constant of 0.34 min−1. This catalyst can be easily recovered using a permanent magnet and recycled eight times with a high catalytic cycle stability. The strategy presented in this work provides a facile and versatile approach towards designing complicated Au–Fe3O4/PDA hollow nanostructures, which might have great potential for many applications within biological, energy, and environmental technologies.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2015
·
IF 5.75
Weifeng Zhao,Karin Odelius,Ulrica Edlund,Changsheng Zhao,Ann-Christine Albertsson
A one-pot synthetic methodology for fabricating stimuli-responsive hemicellulose-based hydrogels was developed that consists of the in situ formation of magnetic iron oxide (Fe3O4) nanoparticles during the covalent cross-linking of O-acetyl-galactoglucomannan (AcGGM). The Fe3O4 nanoparticle content controlled the thermal stability, macrostructure, swelling behavior, and magnetization of the hybrid hydrogels. In addition, the magnetic field-responsive hemicellulose hydrogels (MFRHHs) exhibited excellent adsorption and controlled release profiles with bovine serum albumin (BSA) as the model drug. Therefore, the MFRHHs have great potential to be utilized in the biomedical field for tissue engineering applications, controlled drug delivery, and magnetically assisted bioseparation. Magnetic field-responsive hemicellulose hydrogels, prepared using a straightforward one-step process, expand the applications of biomass-derived polysaccharides by combining the renewability of hemicellulose and the magnetism of Fe3O4 nanoparticles.
研究领域:
材料科学
·
生物医学工程
·
制药工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Xie Yangxuan,Li Xinmei,Wu Liping,Zhang Peihao,Zhang Aixiang
To address the issues of poor wettability, low separation flux, and limited functionality in traditional separation membranes, this study developed an eco-friendly, multifunctional composite membrane based on polylactic acid (PLA/PVP-PDMS/Fe 2 O 4 /TiO 2 ) by combining electrospinning with electrostatic spraying technology. Through morphological and structural characterization, it was demonstrated that the composite membrane exhibits a multiscale rough structure, combining magnetic responsiveness with UV resistance. The results demonstrate that the composite membrane exhibits outstanding oil–water separation performance, achieving a separation flux of up to 4882.15 L·m −2 ·h −1 and a separation efficiency of 99.53%. With a water contact angle as high as 155.5° and a rolling angle as low as 4.5°, it displays superhydrophobic properties and excellent anti-fouling characteristics. In addition, this composite membrane demonstrates excellent potential for treating wastewater in corrosive environments, maintaining a hydrophobic angle above 150° across various corrosive conditions.
✓ 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）