JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Haiwei Ji,Haolu Hu,Qu Tang,Xiaoxia Kang,Xiaodi Liu,Lingfeng Zhao,Rongrong Jing,Mingmin Wu,Guo Li,Xiaobo Zhou,Jinxia Liu,Qi Wang,Hui Cong,Li Wu,Yuling Qin
The biofilm resistance of microorganisms has severe economic and environmental implications, especially the contamination of facilities associated with human life, including medical implants, air-conditioning systems, water supply systems, and food-processing equipment, resulting in the prevalence of infectious diseases. Once bacteria form biofilms, their antibiotic resistance can increase by 10–1,000-fold, posing a great challenge to the treatment of related diseases. In order to overcome the contamination of bacterial biofilm, destroying the biofilm’s matrix so as to solve the penetration depth dilemma of antibacterial agents is the most effective way. Here, a magnetically controlled multifunctional micromotor was developed by using H 2 O 2 as the fuel and MnO 2 as the catalyst to treat bacterial biofilm infection. In the presence of H 2 O 2 , the as-prepared motors could be self-propelled by the generated oxygen microbubbles. Thereby, the remotely controlled motors could drill into the EPS of biofilm and disrupt them completely with the help of bubbles. Finally, the generated highly toxic •OH could efficiently kill the unprotected bacteria. This strategy combined the mechanical damage, highly toxic •OH, and precise magnetic guidance in one system, which could effectively eliminate biologically infectious fouling in microchannels within 10 min, possessing a wide range of practical application prospects especially in large scale and complex infection sites.
研究领域:
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Magnetochemistry
·
2023
·Vol. 9
·期 5
·129
·
IF 2.7
Na Li,Daojing Lin,Junfeng Wu,Quan Gan,Xingyue Hu,Niandong Jiao
The utilisation of miniature robots has become essential in the domain of minimally invasive surgery and long-distance delivery of nanomedicine. Among these, the miniature magnetic continuum robot (MCR) stands out because of its simple structure and dexterity, which allow it to penetrate small cavities, transport specialised tools such as a laser, and deliver medications to support surgical treatment. Nevertheless, because of their soft bodies with a single stiffness, conventional MCRs have limited controllability when navigating through intricate cavities. To address this limitation, we propose a novel concentric magnetic continuum robot (C-MCR) comprising a concentric magnetic catheter with a guidewire having varying stiffness. The C-MCR allows substantial curvature bending owing to its difference in stiffness, and its detachable nature allows it to have four working modes to adapt to specific application requirements with improved stiffness controllability. Experiments demonstrate the ability of the C-MCR to navigate complex pathways and deliver nanomedicines over long distances to specific areas via its internal channels using a large homemade eight-coil electromagnetic system. The C-MCR offers promising application prospects for the long-distance delivery of tailored nanomedicines because of its simple operation, reduced risks, and larger attainable workspace.Keywords:magnetic control;continuum robot;stiffness control;drug delivery
研究领域:
医学工程
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
NPG Asia Materials
·
2022
·Vol. 14
·期 1
·1-9
·
IF 10.761
Xiong Fangyihan,Zhang Liyun,Xu Lei,Zhao Huan,Lan Jianyang,Ji Chenhao,Chen Linfeng,Xia Fan
Directed transport of a small amount of water is a basic issue and has attracted extensive attention due to its importance in a wide range of applications, such as water collection, microfluidics, printing, bioanalysis, and microchemical reactions. Various strategies based on constructing a surface tension gradient or Laplace pressure gradient have been developed to realize directional water transport. Typically, electrostatic forces and magnetic fields are utilized to achieve high-speed water transport on open superhydrophobic surfaces. However, these methods suffer from water evaporation or contamination. Here, we report a magnetic superhydrophobic tubular PDMS actuator for directional water transport. The actuator deformed under an applied external magnetic field and actuated the water droplet to transport along the moving direction of the magnet. The water transport velocity reached 16.1 cm/s. In addition, as the inner surface of the actuator is superhydrophobic, the water droplet showed weak interactions with the surface and presented negligible mass loss during the transport process. The results of this work may inspire new design of actuators for directional water transport with high speeds.
研究领域:
材料科学
·
流体力学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2017
·
IF 0
Liping Wang,Lei Zhang,Qingji Wang,Wenjun Li,Bo Wu,Weishang Jia,Yuehui Wang,Jingze Li,Hong Li
Lithium metal is a Holy Grail anode for high energy density lithium ion batteries . While, its high chemical reactivity and high tendency to form dendrites hinder its wide applications. Here, in this study, we stabilize lithium metal by engineering an artificial SEI layer, namely fabricating a conformal nano-meter thickness amorphous Al 2 O 3 thin film via magnetron sputtering technique on its surface. The obtained Al 2 O 3 modified Li metals present robust chemical surface stability and effectively restrain the dendrite growth. 20 nm-thick Al 2 O 3 film modified lithium metal in an all-solid-state battery Li/PEO-LiTFSI/Li ensures a cycle life of 660 h at a current density of 0.1 mA/cm 2 . Contradicting to a traditional belief of lithium plating at the current collector side via crossing the Al 2 O 3 film, it directly plates on the Al 2 O 3 film next to the separator side. Al 2 O 3 film plays a crucial role as a “surfactant” in inducing a layer-by-layer film growth mode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Limei Tian,Haixu Dou,Yanlong Shao,Yaozhen Yi,Xue Fu,Jie Zhao,Yong Fan,Weihua Ming,Luquan Ren
Controlled liquid adhesion behaviors on super-wetting surfaces have gained significant attention, however, precise controlling of adhesion behavior is extremely hard to realize due to some inherent limitation in surface chemistry or morphology. Herein, we report a silicone-oil-infused magnetic porous polydimethylsiloxane (SMPP) surface with magnetically tunable super-wetting behaviors. Benefiting from the magnetic-field-responsive structure and interconnected porous characteristics, the SMPP can use magnetic field to control the seepage and absorption of silicone oil in the micropore channels, thereby precisely changing the adhesion of the water droplets on the surface. Compared to conventional super-wetting surfaces, this SMPP surface displays reversible in-situ conversion from ultra-high to ultra-low droplet adhesion with sliding angles ranging from 3° to 180° that hold up well even after severe cutting or abrasion. We also demonstrated that this tunable adhesion behavior can be used not only to enhance droplet manipulation in spatiotemporal but also to design unique microfluidic microreactors and antigravity transport devices. We envision that this proof-in-concept surface can serve as an important component of integrated control systems for intelligent manipulators, biochemical reactions, fluid transport, and biomedical analysis.
研究领域:
材料科学
·
微流体技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2021
·
IF 5.458
Wubin Wu,Baipeng Yin,Wei Peng,Yukun Zhao,Zeyang Zhou,Hua Sheng,Wanhong Ma,Chuang Zhang
The chemical reactions involving excited-state radical pairs (RPs) of parallel/anti-parallel spin configurations are sensitive to magnetic field, leading to the possibilities of magnetically controlled synthesis of chemical compounds. Here we show that the reaction of anthraquinone (AQ) in sodium dodecyl sulfate (SDS) micellar solution under UV excitation is significantly influenced by applying external field. The steady state and time-resolved spectroscopies reveal that the reaction intermediate (pairs of AQH-SDS radicals) can undergo two distinct pathways depending on whether it is spin singlet or triplet, and the field is beneficial to the conversion between spin configurations of RPs. The applied field not only affects the reaction rate constant but also changes the final products. Besides, the aggregation of AQ molecules would change the population of singlets and triplets and thus enhance magnetic field effect. This work represents a promising way of controlling chemical reaction and improving reaction selectivity via magnetic field methods.
研究领域:
物理化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Smart Materials and Structures
·
2022
·Vol. 31
·期 3
·035021
·
IF 4.131
Da Hu,Jiayun Deng,Jiabin Lu,Qiusheng Yan,Canlin Du,Jiyang Cao
Magnetorheological elastomers (MREs) are widely used in vibration control due to their excellent magneto-controlled mechanical properties. In this research, polyurethane-based MRE polishing pads were prepared and used for the polishing of single-crystal SiC to investigate the magneto-controlled mechanical properties, the magneto-polishing effect, and the mechanism of action thereof. The results show that the pre-structuring process is affected by parameters such as mass fraction and particle size of magnetic particles in MREs and curing magnetic field strength, different chain strings that demonstrate different magnetorheological effects are formed. The greater the mass fraction of magnetic particles and curing magnetic field strength, the more the MREs exhibit magnetorheological effects, especially so when the magnetic particles size of 3 μm. A series of 90 min polishing experiments on single-crystal SiC with original surface roughness (Ra) 80 nm were conducted using an MRE pad. The results indicate that with the increase of polishing magnetic field strengths, the shear modulus of MRE polishing pads increases, the material removal rate (MRR) of the polishing process increases and Ra decreases. As the magnetic field strength is increased from 0 mT to 335 mT, the shear modulus is increased from 1.392 MPa to 1.825 MPa (an increase of 31.1%), while MRR is increased from 706.3 nm h−1 to 835.3 nm h−1 (an increase of 18.3%), Ra is decreased from 19.92 nm to 3.62 nm (an improvement in surface quality of 81.8%). The results show that the increase of the polishing magnetic field strengths changes the material modulus of the MRE polishing pads, which cause the decreases in the compressive and shear elastic deformation of the abrasive grains on the elastic substrate. This increases the positive pressure of the abrasive grains on the SiC wafer, which enhances the material-removal ability of the SiC wafer, thereby improving the surface quality of the wafer.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 7
·1803
·
IF 3.623
Yibo Ma,Xiaofeng Zhang,Weiming Liu,Youxiu Wei,Ziyi Fu,Jiuyong Li,Xuan Zhang,Jingjing Peng,Yue Yan
A batch of Sn oxides was fabricated by pulse direct current reactive magnetron sputtering (pDC−RMS) using different Ar/O2flow ratios at 0.3 Pa; the influence of stoichiometry on the physical and electrochemical properties of the films was evaluated by the characterization of scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray reflection (XRR), X-ray photoelectron spectroscopy (XPS) and more. The results were as follows. First, the film surface transitioned from a particle morphology (roughness of 50.0 nm) to a smooth state (roughness of 3.7 nm) when Ar/O2flow ratios changed from 30/0 to 23/7; second, all SnOxfilms were in an amorphous state, some samples deposited with low O2flow ratios (≤2 sccm) still included metallic Sn grains. Therefore, the stoichiometry of SnOxcalculated by XPS spectra increased linearly from SnO0.0.08to SnO1.71as the O2flow ratios increased, and the oxidation degree was further calibrated by the average valence method and SnO2standard material. Finally, the electrochemical performance was confirmed to be improved with the increase in oxidation degree (x) in SnOx, and the SnO1.71film deposited with Ar/O2= 23/7 possessed the best cycle performance, reversible capacity of 396.1 mAh/g and a capacity retention ratio of 75.4% after 50 cycles at a constant current density of 44 μA/cm2.Keywords:tin oxide film;reactive magnetron sputtering;oxygen vacancy;cycle performance
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2018
·Vol. 6
·期 19
·1800384
·
IF 7.43
Jiannan Gao,Rong Wang,Qian Zhao,Bo Li,Ji Zhou
In this work, tunable terahertz photonic crystals (PCs) used as modularized and switchable components in flexible passive device are designed and prepared. Flexible woodpile structures created by the direct-writing technology with a composite ink system composed of barium strontium titanate nanoparticles and polydimethylsiloxane are immersed in 5CB liquid crystals (LCs), where the orientation of LC molecule is modulated by the external magnetic field. Each of these can work in terahertz wavelength with specific position and depth of the dips in the transmittance spectra due to different geometries as well as having the ability of fine-tuning. Experiments show that the photonic gaps of these PCs can cover from 0.2 to 0.3 THz, as well as about 7.5% fine tunability of photonic gap appearing with the orientation change of the magnetic field. More interestingly, the dips of photonic gaps keep the same position but become deeper with the increase of layer, an ability to realize another dimensional switchover. This work demonstrates that efficient terahertz PCs with different geometry parameters could be dynamically tuned by the orientation of magnetic field and it can open a universal approach to shrinking the size of device and rapid manufacturing in a large throughput.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·1758-1767
·
IF 2.956
Nan Jiang,Weiping Lin,Yu Zhao,Juntao Wang,Qingsong Gao,Haiyun Qu,Lin Ge,Tengfei Xie,Qiang Liu,Yubai Pan,Jiang Li
Using the tape casting method combined with vacuum sintering and hot isostatic pressing, high-quality planar waveguide YAG/10 at.%Yb:YAG/YAG ceramics were successfully prepared. For the sample presintered at 1750°C for 30 hours and then HIPed at 1700°C for 3 hours in 200 MPa argon, the in-line transmittance reached 82.5% at 400 nm and the average grain size was ~17.1 μm. The diffusion behaviors of Yb ions across the contact boundary between the cladding YAG layer and the core Yb:YAG layer were determined by Fick's second law. Then, a 1030 nm continuous-wave (CW) Yb:YAG planar waveguide ceramic laser based on the structure of master oscillator power amplification (MOPA) was realized. After a single-pass amplification, the maximum output of the ceramic slab (60 × 10 × 1 mm 3 ) reached 1251 W and the corresponding optical-to-optical efficiency was 30.0%, which is the highest output power of a Yb:YAG planar waveguide ceramic laser to the best of our knowledge.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 2
·164
·
IF 2.9
Wanlei Dai,Zhaoyi Jiang,Yali Sun,Juhua Wang,Zeran Gao,Haoyu Xu,Xinzhan Wang,Chao Gao,Qiang Ma,Yinglong Wang,Wei Yu
In this study, a feasible strategy is proposed for directly depositing high-quality Cu(In,Ga)Se2(CIGS) films using Na-doped targets in a selenium-free atmosphere to boost the power conversion efficiency (PCE) of CIGS solar cells. Introducing a small amount of sodium dopant effectively promoted the textured growth of CIGS crystals in the prepared films, resulting in larger grain sizes and a smoother interface. The higher MoSe2content at the CIGS/Mo interface increased the carrier lifetime in the films. In addition, sodium doping increased the proportion of Se atoms on the film surface and reduced the concentration of defects caused by the direct sputtering of the films in the selenium-free atmosphere. Therefore, the separation and transportation of photo-generated carriers in the devices were effectively enhanced. Using the optimized parameters, a record-high PCE of 17.26% was achieved for the 7.5% Na-doped devices, which represents an improvement of nearly 63%.Keywords:Cu(In,Ga)Se2;sodium-doped targets;magnetron sputtering;solar cells
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·289
·
IF 3.504
Mingli Wang,Guochao Shi,Yanying Zhu,Yuhong Wang,Wanli Ma
Rapid sampling and multicomponent analysis are vital in pesticide residue detection. In this work, we proposed a SERS platform to detect three kinds of pesticides on apple peels simultaneously by a straightforward “press and peel off” method. The flexible Au/dragonfly wing (Au/DW) substrate was obtained from sputtering Au nanoislands on DW bioscaffold arrays by a simple direct current (DC) magnetron sputtering system. The high-performance substrate exhibited a low limit of detection (LOD) to 4-aminothiophenol (4-ATP) (10−9M), outstanding reproducibility (less than 12.15%), good stability and suitability in multifold pesticide residues detection. Considering its excellent sample collection efficiency, the Au/DW substrate was employed to solve critical pesticide residue problems for detection of acephate (APT), cypermethrin (CPT), tsumacide (MTMC) and their multiple components on apple peels. The results show that the LOD was 10−3ng/cm2for APT obtained on the apple surface with a calculation equation of y = 0.26x + 6.68 and a determination coefficient (R2) of 0.970. Additionally, the LOD values for CPT and MTMC were 10−3ng/cm2and 10−4ng/cm2, respectively. The finding in this work may provide a promising biomimetic SERS platform for on-spot detection of other organic pollutants in the food industry and inenvironmental protection.Keywords:SERS;dragonfly wing;magnetron sputtering;pesticide residue
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
危险品化学品经营许可证（带存储）