Soft Matter
·
2024
·Vol. 20
·期 27
·5314-5323
·
IF 2.9
Ye Tian,Zhirui Xu,Hao Qi,Xiaojun Lu,Ting Jiang,Liqian Wang,Guang Zhang,Rui Xiao,Huaping Wu
Magnetic hydrogel actuators exhibit promising applications in the fields of soft robotics, bioactuators, and flexible sensors owing to their inherent advantages such as remote control capability, untethered deformation and motion control, as well as easily manipulable behavior. However, it is still a challenge for magnetic hydrogels to achieve adjustable stiffness and shape fixation under magnetic field actuation deformation. Herein, a simple and effective approach is proposed for the design of magnetic shape memory hydrogels to accomplish this objective. The magnetic shape memory hydrogels, consisting of methacrylamide, methacrylic acid, polyvinyl alcohol and Fe3O4 magnetic particles, which crosslinked by hydrogen bonds, are facilely prepared via one-pot polymerization. The dynamic nature of noncovalent bonds offers the magnetic hydrogels with excellent mechanical properties, precisely controlled stiffness, and effective shape fixation. The presence of Fe3O4 particles renders the hydrogels soft when subjected to an alternating current field, facilitating their deformation under the influence of an actuation magnetic field. After the elimination of the alternating current magnetic field, the hydrogels stiffen and attain a fixed actuated shape in the absence of any external magnetic field. Moreover, this remarkable magnetic shape memory hydrogel is effectively employed as an underwater soft gripper for lifting heavy objects. This work provides a novel strategy for fabricating magnetic hydrogels with non-contact reversible actuation deformation, tunable stiffness and shape locking.
研究领域:
材料科学
·
软体机器人
·
智能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 35
·21476-21483
·
IF 3.108
Mingsen Chen,Guisheng Gong,Li Zhou,Faai Zhang
This study proposes a simple method to fabricate a magnetic self-healing poly(vinyl alcohol) (ms-PVA) composite hydrogel. The obtained ms-PVA hydrogel was characterized by vibrating sample magnetometery and transmission electron microscopy. The self-healing property was investigated using a rheometer and tensile strength tests. Results showed that the ms-PVA hydrogel exhibited an excellent self-healing property and controllable magnetic intensity by adjusting the Fe3O4 particle content. The added Fe3O4 particles did not participate in hydrogen bond interactions but did cause the magnetic properties of the hydrogel. The hydrogel showed the best self-healing performance when the amount of Fe3O4 particles was 5 wt% (based on ms-PVA). The ms-PVA composite hydrogel presents a new application of the PVA hydrogel given its facile fabrication process and excellent performance.
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
ANALYST
·
2012
·Vol. 137
·期 10
·2503-2512
·
IF 4.23
Huan Zeng,Yuzhi Wang,Chan Nie,Jinhuan Kong,Xiaojie Liu
The preparation of magnetic molecularly imprinted polymers (MMIPs) which can be used for the separation and purification of rutin from Chinese medicinal plants has been proposed. By applying the improved co-precipitation method, magnetic Fe3O4 particles were easily prepared, followed by the modification of TEOS and functionalization with –CHCH2. Using functionalized Fe3O4 particles as the magnetic cores, rutin as the template, and acrylamide as the functional monomer, MMIPs were synthesized by surface-imprinted polymerization under the protection of nitrogen gas and successive mechanical stirring at 60 °C for 24 h. Magnetic non-molecularly imprinted polymers (MNIPs) were also prepared with the same synthesis procedure as with MMIPs only without the presence of rutin. Magnetic particles were characterized by FT-IR, XRD, and TG analysis. And the selectivity of MMIPs was also investigated in detail. In addition, the performance of the MMIPs for the adsorption of rutin in the analysis of Chinese medicinal plants was assessed. The mean recoveries were 84.33% (RSD: 3.22%, n = 3) for Saururus chinensis (Lour.) Bail and 85.20% (RSD: 3.58%, n = 3) for Flos Sophorae, respectively, which showed that the prepared MMIPs with many advantages possess the value of practical application.
研究领域:
药物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 17
·8056-8066
·
IF 6.233
Song Shen,Fenfen Kong,Xiaomeng Guo,Lin Wu,Haijun Shen,Meng Xie,Xinshi Wang,Yi Jin,Yanru Ge
With the potential uses of photothermal therapy (PTT) in cancer treatment with excellent efficacy, and the growing concerns about the nanotoxicity of hyperthermia agents such as carbon nanotubes and gold-based nanomaterials, the importance of searching for a biocompatible hyperthermia agent cannot be emphasized too much. In this work, a novel promising hyperthermia agent employing magnetic Fe3O4 particles with fairly low toxicity was proposed. This hyperthermia agent showed rapid heat generation under NIR irradiation. After modification with carboxymethyl chitosan (CMCTS), the obtained Fe3O4@CMCTS particles could disperse stably in PBS and serum without any aggregation. The modification of CMCTS could decrease the adsorption of bovine serum albumin (BSA) and improve the cellular uptake. In a comparative study with hollow gold nanospheres (HAuNS), Fe3O4@CMCTS particles exhibited a comparable photothermal effect and fairly low cytotoxicity. The in vivo magnetic resonance (MR) images of mice revealed that by attaching a magnet to the tumor, Fe3O4@CMCTS particles accumulated in the tumor after intravenous injection and showed a low distribution in the liver. After being exposed to a 808 nm laser for 5 min at a low power density of 1.5 W cm−2, the tumors on Fe3O4@CMCTS-injected mice reached a temperature of ∼52 °C and were completely destroyed. Thus, a kind of multifunctional magnetic nanoparticle with extremely low toxicity and a simple structure for simultaneous MR imaging, targeted drug delivery and photothermal therapy can be easily fabricated.
研究领域:
纳米医学
·
肿瘤学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 6
·1111
·
IF 5.3
Wen-Xin Liu,Wei-Na Zhou,Shuang Song,Yong-Gang Zhao,Yin Lu
A new type of magnetic nanomaterial with Fe3O4as the core and organic polymer as the shell was synthesized by seed emulsion polymerization. This material not only overcomes the problem of insufficient mechanical strength of the organic polymer, it also solves the problem that Fe3O4is prone to oxidation and agglomeration. In order to make the particle size of Fe3O4meet the requirement of the seed, the solvothermal method was used to prepare Fe3O4. The effects of the reaction time, amount of solvent, pH value, and polyethylene glycol (PEG) on the particle size of Fe3O4were investigated. In addition, in order to accelerate the reaction rate, the feasibility of preparing Fe3O4by microwave was studied. The results showed that under the optimum conditions, the particle size of Fe3O4could reach 400 nm and had good magnetic properties. After three stages of oleic acid coating, seed emulsion polymerization, and C18 modification, the obtained C18-functionalized magnetic nanomaterials were used for the preparation of the chromatographic column. Under optimal conditions, stepwise elution significantly shortened the elution time of sulfamethyldiazine, sulfamethazine, sulfamethoxypyridazine, and sulfamethoxazole while still achieving a baseline separation.Keywords:solvothermal method;chromatographic packing materials;magnetic Fe3O4particles;C18-functionalized magnetic nanomaterials
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hui Zheng,Runqiu Li,Shijun Dong,Wei Chen,Lining Fan,Weijia Li,Peng Zheng,Liang Zheng,Yang Zhang,Longjiang Deng
Interface modulation of graphene and magnetic particles for synergistic dielectric loss and magnetic loss is a feasible approach to realize ideal absorbing materials with a light weight, low thickness, wide bandwidth and strong absorption. In this work, an interface of iron carbide (FeC) was formed between 3D-graphene-like and Fe-coated Fe 3 O 4 particles by a vacuum heating treatment method using ferric nitrate and glucose as precursors. It is concluded that the FeC interface was formed at limited temperatures, not only producing high interface polarization but also maximizing the synergistic effect of dielectric loss in 3D-graphene-like and magnetic loss in Fe 3 O 4 . The obtained 3D-graphene/FeC/Fe/Fe 3 O 4 hybrids exhibit comprehensively optimal microwave absorption performance with a reflection loss of − 53.52 dB and a broad effective absorption bandwidth of 5.28 GHz@ <10 dB at a thickness of only 1.75 mm, showing great potential for practical applications in the field of electromagnetic absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2011
·
IF 3.074
Jianming Pan,Longcheng Xu,Jiangdong Dai,Xiuxiu Li,Hui Hang,Pengwei Huo,Chunxiang Li,Yongsheng Yan
Via encapsulation of attapulgite/Fe 3 O 4 magnetic particles (ATP/Fe 3 O 4 ), the magnetic molecularly imprinted polymers (MMIPs) were synthesized for the selective recognition of 2,4-dichlorophenol (2,4-DCP). MMIPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) analysis, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), nitrogen adsorption–desorption analysis and Raman spectroscopy. MMIPs were demonstrated claviform shape with an imprinted polymer film (thickness of about 16 nm), and exhibited magnetic property ( M s = 5.67 emu g −1 ) and thermal stability. Batch mode adsorption studies were carried out to investigate the specific binding capacity, binding kinetics and recognition specificity. The Langmuir isotherm model was fitted to the equilibrium data better than the other models, and the monolayer adsorption capacity of MMIPs were 145.79 mg g −1 at 298 K. The kinetic properties of MMIPs were well described by the pseudo-second-order equation, initial adsorption rate and half-adsorption time. The selective recognition experiments demonstrated high affinity and selectivity towards 2,4-DCP over structurally related phenolic compounds. In addition, MMIPs could be regenerated, and their adsorption capacity in the fifth use was about 7.53% loss in 2,4-DCP solution. The MMIPs as-prepared were successfully applied to the separation of 2,4-DCP from environmental water samples.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yong Xu,Gang Wang,Lijing Zhu,Wanshun Deng,Chunting Wang,Tianhui Ren,Baikang Zhu,Zhixiang Zeng
Owing to its high selective adsorption and excellent cyclability, superwetting materials have attracted considerable attention in environmental governance, especially oily wastewater treatment. However, the inferior separation efficiency and high recovery energy consumption seriously limit the actual application of superwetting particles in oil–water emulsion separation. Herein, inspired reversely by the water collection and water retention of the hydrophilic/superhydrophobic structure on the Stenocara beetle’s back, we fabricated magnetic graphene oxide composite with beetle-like microstructure by one-step solvothermal and environmentally friendly ball milling method. Magnetic composite with superhydrophobic/superoleophilic bumps–hydrophilic underlayer exhibits high hydrophobicity/oleophilicity in air and high oleophobicity underwater. In the process of particle assembly, the Fe 3 O 4 grains with abundant oxygen vacancies peeled off from the in-situ deposited magnetic Fe 3 O 4 microspheres play a bridging role to immobilize the superhydrophobic carbon black particles on the graphene oxide (GO) surface. On the unique surface of magnetic composite, attributed to strong π–π/n–π interface adsorption and hydrophobic interaction, the oil–water separation can be rapidly demulsified and the superoleophilic bumps (superhydrophobic carbon black nanoparticles) can capture and aggregate tiny oil droplets. The hydration layer formed in the hydrophilic region effectively prevents the captured oil droplets from spreading on the composite structure, thus enhancing the emulsion separation ability of magnetic GO. More importantly, the prepared composites exhibit efficient recycling and regeneration under solar irradiation, which is superior to the recovery efficiency of traditional GO sheets lacking high self-heating components. These inverse beetle-like magnetic GO-based particles open up a new opportunity for the design and fabrication of advanced demulsifiers in the field of oil–water emulsion separation.
研究领域:
环境科学
·
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Rui Zheng,Sheng Wang,Ye Tian,Xinguo Jiang,Deliang Fu,Shun Shen,Wuli Yang
Recently, photothermal therapy (PTT) that utilizes photothermal conversion (PTC) agents to ablate cancer under near-infrared (NIR) irradiation has attracted a growing amount of attention because of its excellent therapeutic efficacy and improved target selectivity. Therefore, exploring novel PTC agents with an outstanding photothermal effect is a current research focus. Herein, we reported a polydopamine-coated magnetic composite particle with an enhanced PTC effect, which was synthesized simply through coating polydopamine (PDA) on the surface of magnetic Fe3O4 particles. Compared with magnetic Fe3O4 particles and PDA nanospheres, the core–shell nanomaterials exhibited an increased NIR absorption, and thus, an enhanced photothermal effect was obtained. We demonstrated the in vitro and in vivo effects of the photothermal therapy using our composite particles and their ability as a contrast agent in the T2-weighted magnetic resonance imaging. These results indicated that the multifunctional composite particles with enhanced photothermal effect are superior to magnetic Fe3O4 particles and PDA nanospheres alone.
研究领域:
生物医学工程
·
材料科学
·
纳米技术
·
癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.2
Rao Qian,Li Hui-qiang,Yang Ping,Guo Ziou
Mo 2 C@Fe 3 O 4 and three kinds of MO 2 -doped Mo 2 C@Fe 3 O 4 were successfully fabricated as the Mo 2 C@TiO 2 @Fe 3 O 4 , Mo 2 C@MoO 2 @Fe 3 O 4 and Mo 2 C@CeO 2 @Fe 3 O 4 particles for the degradation of 2-methyl-4-isothiazolin-3-one and 1-hydroxy-1,1-diphosphonoethane in a three-dimensional electro-Fenton system. The catalyst particles showed an enhancement for the catalytic activity in the system. Furthermore, the Mo 2 C@CeO 2 @Fe 3 O 4 particles exhibited superior activity for 2-methyl-4-isothiazolin-3-one and 1-hydroxy-1,1-diphosphonoethane degradation compared to the other two particles. Based on the characterization of the synthesized particles, leaching concentration of Fe 2+ , generation of \({H}_{2}{O}_{2}\) , \(\bullet OH\) , \({O}_{2}^{\bullet -}\) , the reasons for the difference in pollutant degradation performance among the three type particles were comprehensively analyzed. At last, some important experimental parameters, such as particles dosage, current density and aeration intensity, which would obviously affect MIT and HEDP degradation performance were studied. Using the Mo 2 C@CeO 2 @Fe 3 O 4 as catalytic particles, optimal 2-methyl-4-isothiazolin-3-one and 1-hydroxy-1,1-diphosphonoethane degradation rates were 97.2% and 73.8% with 0.5 g of particle dosage, 97.22% and 73.75% with 300 mA of current density, and 97.28% and 73.71% with 0.1 L min −1 of aeration intensity.
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
INTERNATIONAL POLYMER PROCESSING
·
2021
·Vol. 36
·期 2
·165-171
·
IF 0.824
Y.-J. Chang,Q. Zhou,W.-H. Hou,Y.-H. Liang,L. Ren,D.-H. Sun,L.-Q. Ren
Novel kinds of magnetism-driven poly N,N-dimethylacrylamide bilayer intelligent hydrogels with various nanofibrillated cellulose (NFC) contents were prepared successfully via one-step insitu free radical polymerization. The bilayer hydrogels possessed high mechanical strength, efficient swelling and steady magnetic response. With the increase of nanofibrillated cellulose content, the crosslinking density of the hydrogels increased, leading to the decrease of swelling rate and increase of mechanical strength and swelling bending degree of hydrogel actuators, respectively. Fe 3 O 4 particles existed tightly on the micropore surfaces of the hydrogels, which built the function base of magnetic response of hydrogel actuators. The addition of Fe 3 O 4 was irrelevant to the variation of crosslinking density. The bilayer structure exhibited high bonding strength. Based on intelligent responsive properties, bilayer hydrogels were designed as soft magnetism-driven actuators, realizing capture and transportation properties and provided material candidates for soft robots.
研究领域:
材料科学
·
纳米技术
·
软体机器人
·
高分子化学
✓ 已验证
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2024
·
IF 4.3
Jiang Fengqi,Zheng Qiuyan,Zhao Qingsong,Qi Zijuan,Wu Di,Li Wenzhong,Wu Xiaoke,Han Conghui
Research and development in the field of micro/nano-robots have made significant progress in the past, especially in the field of clinical medicine, where further research may lead to many revolutionary achievements. Through the research and experiment of microrobots, a controllable drug delivery system will be realized, which will solve many problems in drug treatment. In this work, we design and study the ability of magnetic-driven hydrogel microrobots to carry Lycorine hydrochloride (LH) to inhibit colorectal cancer (CRC) cells. We have successfully designed a magnetic field driven, biocompatible drug carrying hydrogel microsphere robot with Fe3O4 particles inside, which can achieve magnetic field response, and confirmed that it can transport drug through fluorescence microscope. We have successfully demonstrated the motion mode of hydrogel microrobots driven by a rotating external magnetic field. This driving method allows the microrobots to move in a precise and controllable manner, providing tremendous potential for their use in various applications. Finally, we selected drug LH and loaded it into the hydrogel microrobot for a series of experiments. LH significantly inhibited CRC cells proliferation in a dose- and time-dependent manner. LH inhibited the proliferation, mobility of CRC cells and induced apoptosis. This delivery system can significantly improve the therapeutic effect of drugs on tumors.
研究领域:
生物医学工程
·
癌症研究
·
药物递送系统
·
纳米技术
✓ 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）