JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Tianhao Xia,Yuwen Yuan,Yunpeng Wang,Pragati Awasthi,Wenkun Dong,Xvsheng Qiao,Dong Chen,Shisheng Ling,Xianping Fan
This study aims to advance the development of magnetic fluorescent polymer microspheres for biomedical detection applications. Conventionally, dopants have utilized europium(III) (Eu(III)) organic complexes due to their high compatibility with polymers and strong fluorescence. However, as the common magnetic material Fe 3 O 4 can quench their fluorescence, it is hard to synthesize Eu complex-doped magnetic fluorescent materials. To maintain fluorescence in the presence of magnetic parts, in this work, we synthesized Eu-doped magnetic microspheres with multi-layered structure. Firstly, poly-(glycidyl methacrylate) (PGMA) microspheres were prepared as templates and subsequently coated with layers of Fe 3 O 4 and SiO 2 . Then, the synthesized Eu(TTA) 3 (TPPO) 2 were added into PGMA@Fe 3 O 4 @SiO 2 microspheres in either basic or acidic conditions, and covered them with an extra sol–gel layer of silica at the same time. The microspheres exhibit a core–shell structure with sub-micron dimensions (580 nm) and possess favorable superparamagnetic properties ( M s = 22.02 A·m 2 /kg, M r = 1.37 A·m 2 /kg, H c = 0.242 A/m). But the fluorescence of Eu 3+ are significantly quenched by Fe 3 O 4 , O–H oscillators, and N–H oscillators. Finally, to exclude the quenching mentioned above, the first pure SiO 2 shielding layer and the second Eu(TTA) 3 (TPPO) 2 -dispersed SiO 2 layer were coated onto PGMA@Fe 3 O 4 microspheres to prevent the energy transfer due to the quenching centers and hold the fluorescence of Eu 3+ . These findings underscore the considerable potential of these microspheres exhibiting rapid magnetic separation and stable fluorescence for bioimaging and biosensing applications.
研究领域:
材料科学
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生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jinqiu Chen,Xingman Hu,Zhuguang Nie,Yang Feng,Shuhua Qi,Rumin Wang
The development of flexible, thin, multifunctional materials represents a strategic advancement for the creation of next-generation wearables that offer both electromagnetic shielding and thermal management. This study introduces the fabrication of a multilayer MXene/polyimide (MXene/PI) composite film , demonstrating significant electromagnetic shielding effectiveness (EMI SE) and photothermal conversion efficiency through a layer-by-layer casting technique. When the MXene content is 29.7 wt%, the alternating multilayer MXene/PI composite film can reach a high EMI SE of 23.3 dB at 0.26 mm thickness, and when the MXene content is 45.7 wt%, the EMI SE can reach a maximum of 40.7 dB, which has a significant advantage over other materials. This superior performance exceed that of alternative materials, owing to the multilayer MXene construction that magnifies electromagnetic wave reflection losses. Furthermore, the film displays a rapid and sensitive photothermal response under laser irradiation , achieving temperatures up to 93°C at a 0.5 W/cm 2 density. Impressively, at 0.4 W/cm 2 , it maintains a stable long-term saturation temperature over 40 cycles, showing its potential in applications such as photothermal sensors, personal heating, and muscle protection.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yali Zhang,Hongwei Zhang,Fei Xiao
Active aluminum composites are ideal choices for portable hydrogen sources and are playing an increasingly important role in the field of emergency response. The hydrogen production rate from their reaction with water is a key factor determining the practical application effectiveness of these materials. This study thoroughly investigates the catalytic effects of four ammonium salts on the hydrogen production rate of active aluminum composites in water reactions. By incorporating four types of ammonium salts (Al/Bi/NH 4 Cl, Al/Bi/(NH 4 ) 2 C 2 O 4 , Al/Bi/(NH 4 ) 2 CO 3 , and Al/Bi/NH 4 H 2 PO 4 ) along with bismuth into aluminum powder and preparing them through ball milling, four types of active aluminum composites were obtained. A detailed analysis was conducted on the microstructures of these composites and their hydrogen production performance in water reactions. The results show that NH 4 Cl can form a multilayer structure on the surface of Al/Bi/NH 4 Cl, allowing this composite to exhibit the best hydrogen production performance, reaching a maximum hydrogen production rate of 14.4 mL g −1 s −1 and a maximum hydrogen volume of 948 mL g −1 at 45 °C. Additionally, the mechanisms by which different ammonium salts influence the hydrogen production rate of active aluminum composites in water reactions were discussed in detail. The unique multilayer structure of Al/Bi/NH 4 Cl and the excellent solubility of NH 4 Cl contribute to accelerating particle rupture and enhancing the reaction rate. More importantly, H + ions released from the hydrolysis of NH 4 Cl can neutralize OH − produced during the reaction, effectively controlling the pH value of the reaction medium, preventing the deposition of aluminum hydroxide on the aluminum surface, and thus maintaining a larger reaction surface area and continuous reaction activity. The study shows that adjusting the types of ammonium salts can effectively regulate the water reaction kinetics of active aluminum composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2022
·
IF 19.967
Zhimin An,Yiping Li,Xiaoguang Luo,Yixing Huang,Rubing Zhang,Daining Fang
A multifunctional stealth technology compatible with infrared and radar is one of the most feasible ways to improve the survival of military equipment under high-temperature conditions. However, it is difficult to effectively integrate multiple functions into one material owing to the contradictory stealth mechanisms of infrared and radar. Herein, the near-room-temperature integrated preparation of a hierarchical metastructure with high-temperature resistance, broadband microwave absorption, and infrared stealth is realized by combining topological optimization of metastructure and a papermaking method. The tailored metastructure exhibits an effective bandwidth and absorption peak of 3.1 GHz and −25.9 dB at 1,000°C. The excellent thermal insulation allows the metastructure to achieve infrared stealth, which can reduce the radiation temperature of an object from 1,200°C to 340°C. The new technology paves the way for the design and preparation of a radar-infrared bi-stealth metastructure applied to high temperature.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 42
·1903774
·
IF 15.621
Zhongliang Huang,Longlong Fan,Feigang Zhao,Bin Chen,Kaiji Xu,Shu-Feng Zhou,Jinli Zhang,Qingbiao Li,Dan Hua,Guowu Zhan
Hybrid metal oxides with multilayered structures exhibit unique physical and chemical properties, particularly important to heterogeneous catalysis. However, regulations of morphology, spatial location, and shell numbers of the hybrid metal oxides still remain a challenge. Herein, binary Co 3 O 4 /ZnO nanocages with multilayered structures (up to eight layers) are prepared via chemical transformation from diverse Matryoshka-type zeolitic imidazolate frameworks (ZIFs) via a straightforward and scalable calcination method. More importantly, the obtained ZIF-derived metal oxides (ZDMOs) with versatile layer numbers exhibit remarkable catalytic activity for both gas-phase CO oxidation and CO 2 hydrogenation reactions, which are directly related to the sophisticated shell numbers (i.e., Co 3 O 4 -terminated layers or ZnO-terminated layers). Particularly, in situ reflectance infrared Fourier transform spectroscopy (DRIFTS) results indicate that the promotional effects of the multilayered structures indeed exist in CO 2 hydrogenation, wherein the key reaction intermediates are quite different for five-layer and six-layer ZDMOs. For instance, *HCOO is the predominant intermediate over the six-layer ZDMO; on the contrary, *H 3 CO is the crucial species over the five-layer ZDMO. The ZnO/Co 3 O 4 interface should be the active sites for CO 2 hydrogenation to *HCOO and *H 3 CO species, which are ultimately converted to the products (CH 4 or methanol). Accordingly, the work here provides a convenient way to facilely engineer multilayered Co 3 O 4 /ZnO nanocomposites with precisely controlled shell numbers for heterogeneous catalysis applications.
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
Biofabrication
·
2013
·Vol. 5
·期 3
·035004
·
IF 3.705
Yu Long Han,Yanshen Yang,Shaobao Liu,Jinhui Wu,Yongmei Chen,Tian Jian Lu,Feng Xu
The unique benefit of electrostatic self-assembly of microscale components in solution is demonstrated for the first time. In particular, positive and negative treatment of poly(ethylene glycol) (PEG) facilitates a novel bottom-up assembly approach using electrostatic interaction from microgels with opposite charges. Fundamental investigations of electrostatic interaction of microgels reveal that the contact area of microgels determines the total energy of construct and thus the final patterns. The electrostatic self-assembly approach enables the fabrication of large and complex biological related structures (e.g., multi-layer spheroid) with accurate control. By the design of the microgels, the thickness and number of microgels in each layer can be controlled. Biological investigations of positive and negative treatments of PEG further prove the possibility of using this approach in tissue engineering, regenerative medicine and drug delivery.
研究领域:
生物材料学
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再生医学
·
药物递送
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1370
·
IF 4.967
Xingyu Yuan,Wen Li,Bin Yao,Zhao Li,Deling Kong,Sha Huang,Meifeng Zhu
Bionic grafts hold great promise for directing tissue regeneration. In vascular tissue engineering, although a large number of synthetic grafts have been constructed, these substitutes only partially recapitulated the tri-layered structure of native arteries. Synthetic polymers such as poly(l-lactide-co-ε-caprolactone) (PLCL) possess good biocompatibility, controllable degradation, remarkable processability, and sufficient mechanical strength. These properties of PLCL show great promise for fabricating synthetic vascular substitutes. Here, tri-layered PLCL vascular grafts (TVGs) composed of a smooth inner layer, circumferentially aligned fibrous middle layer, and randomly distributed fibrous outer layer were prepared by sequentially using ink printing, wet spinning, and electrospinning techniques. TVGs possessed kink resistance and sufficient mechanical properties (tensile strength, elastic modulus, suture retention strength, and burst pressure) equivalent to the gold standard conduits of clinical application, i.e., human saphenous veins and human internal mammary arteries. The stratified structure of TVGs exhibited a visible guiding effect on specific vascular cells including enhancing endothelial cell (EC) monolayer formation, favoring vascular smooth muscle cells’ (VSMCs) arrangement and elongation, and facilitating fibroblasts’ proliferation and junction establishment. Our research provides a new avenue for designing synthetic vascular grafts with polymers.Keywords:biomimetic;multilayer structure;smooth surface;aligned microfiber;random microfiber
研究领域:
组织工程
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2022
·
IF 11.211
Xiaoxiang Cheng,Yongrui Zhang,Senlin Shao,Cunxian Lai,Daoji Wu,Jingtao Xu,Xinsheng Luo,Daliang Xu,Heng Liang,Xuewu Zhu
Positively charged nanofiltration (NF) membranes have been vitally employed to treat heavy metal ions contained in wastewater. Nevertheless, positively charged NF membranes possessing both high permeance and rejections continue to be a bottleneck in engineering applications owing to the trade-off between rejection and permeance. Herein, a highly permeable and positively charged NF membrane with multilayer structures was prepared using a chitosan interlayer-assisted low-temperature interfacial polymerization and surface grafting polyethyleneimine (CIL-IP-P) strategy. The chemical components, surface morphologies , and separation characteristics of the prepared NF membranes were investigated systematically. The construction of a chitosan interlayer increased hydrophilicity and influenced the IP reaction by modulating the monomer diffusion. Grafting polyethyleneimine (PEI) further resulted in NF membranes with higher electro-positivity, larger specific surface area, and narrower average pore diameter . Hence, the trade-off between rejection and permeance in conventional positively charged NF membranes was surmounted. An excellent water permeance of 10.9 ± 0.6 L m −2 h −1 bar −1 and a satisfactory rejection for heavy metals (93.3, 92.8, 91.0, 90.4, and 89.2 % for Ni 2+ , Mn 2+ , Cu 2+ , Cd 2+ , and Pb 2+ ) were observed. The CIL-IP-P strategy provided in this study is promising to tailor a high-performance positively charged NF membrane for fast heavy metal removals.
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
CARBON
·
2024
·
IF 10.5
Chengcheng Jiao,Huanyi Chen,Xinxin Ruan,Qingzhao Cai,Long Chen,Jian Yi,Jinhong Yu,Kazuhito Nishimura,Nan Jiang,Tao Cai
The articulating joints consist of a three-layer lubricating structure, which combines soft and hard materials, including cartilage, polymer brushes, and a hydration layer. This structure leverages the synergistic effects of fluid and boundary lubrication to maintain ultra-low friction under different pressures on the same frictional surface. In this study, a biomimetic multilayer lubricating structure inspired by joint tissues is constructed using single-crystalline diamond nanosheets (SCND) as the hard phase material. Through a facile chemical reduction method and employing polydopamine (PDA) as a "bridge", a soft phase material is deposited onto the SCND surface to produce diamond composite silver nanocomposites (SCND@PDA@Ag). Subsequently, two solvent-free SCND@PDA@Ag nanofluids are prepared by grafting organic canopy substances onto the SCND@PDA@Ag surface via ionic bonds or covalent bonds, referred to as SCND@PDA@Ag-ionic bonding nanofluid and SCND@PDA@Ag-covalent bonding nanofluid, respectively. The findings reveal that the SCND@PDA@Ag-covalent bonding solvent-free nanofluid exhibits superior lubricating performance for steel/SiC contacts. The friction coefficient and wear rate for steel/SiC are significantly reduced by 93.2 % and 63.1 %, respectively, compared to dry friction, it's noteworthy that these results outperform those achieved by individual components of the lubricant. During the friction process, SCND and silver particles on the surface of SCND@PDA@Ag-covalent bonding solvent-free nanofluid work together to enhance lubrication synergistically. Furthermore, silver particles on the surface of SCND are released and fill into the worn surface, providing a repairing effect. This study highlights that the design of soft-hard multilayer structures offers a novel approach for researching nanocomposite materials in the field of tribology.
研究领域:
材料科学
·
摩擦学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 7
·075314
·
IF 1.449
Lu Chen,Chao Xiao,Yunlu Tang,Xian Zhang,Kang Zheng,Xingyou Tian
A multilayered thermally conductive composite with ternary system of heat conductive fillers-thermally conductive films-epoxy matrix was prepared through a facile process of layer-by-layer stacking, pre-curing and hot-pressing. The thermally conductive films (boron nitride nanosheets/cellulose nanofiber) with high in-plane thermal conductivities were employed as the heat conductive medium, while the platelet-shaped hexagonal boron nitride and the particle-shaped aluminum nitride were utilized as heat conductive fillers for enhancing the perfection of the thermally conductive network. A horizontally heat conductive network was constructed within the epoxy matrix under the joint contribution of the horizontally aligned hexagonal boron nitride platelets and the parallelly spread thermally conductive films through hot-pressing. The aluminum nitride particles acted as linking points, filling the gaps between hexagonal boron nitride platelets, while constructing the thermally conductive path in the vertical direction. Thanks to the introduction of thermally conductive films and the good orientation of boron nitride platelets, the in-plane thermal conductivities of the composites increased with increasing of film layer number. With film layer number of 9, and filler content of 30 wt% (aluminum nitride/boron nitride (1:1)), the in-plane thermal conductivity of the composite was as high as 8.53 W m−1 * K, which showed an enhancement of 4165% than that of the pure epoxy matrix, and an improvement of 613% compared to that of the composite without multilayered structure. Meanwhile, the out-of-plane thermal conductivity exhibited a slightly deceased tendency as film layer number increased, but it still reached 0.87 W m−1 * K with film layer number of 9, which was 335% higher than that of the pure epoxy. In addition, the multilayered composite also possessed good thermal stability, enhanced stiffness, as well as low dielectric constant and dielectric loss, which shows a potential application in thermal management for packaging of integrated circuit and microelectronic devices.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xingzhen Zhang,Yuzhang Zhu,Feng Zhang,Yuyue Mo,Yatao Zhang,Wangxi Fang,Jian Jin
Developing a membrane integrating high permeating flux and high separation efficiency for the purification of oil-in-water emulsions is significant but still challenging due to the perm-selectivity “trade-off”. Herein, we design a nanofibrous membrane with special hydrophilic/hydrophobic intercalated multilayer structure to efficiently separate oil-in-water emulsions. The multilayer membrane is composed of alternatively deposited hydrophilic polyacrylonitrile (PAN)/ZnO nanoneedles composite fibers layers and hydrophobic poly(vinylidene fluoride-co- hexa -fluoropropylene) (PVDF-HEP) fibers layers, where vertically grown ZnO nanoneedles pierce through PVDF-HEP fibers layer and connect the whole membrane up and down. The special multilayer structure can exert the synergistic effect between size sieving mechanism of hydrophilic layers and coalescence mechanism of hydrophobic layers during the separation of oil-in-water emulsion, which overcomes the size mismatch between large pore sizes of membrane and small droplets of emulsion. With the mean pore size of 1.1 μm for the multilayer composite membrane, a high permeating flux up to 32,100 L m -2 h −1 bar −1 with the oil content in filtrate as low as 4 mg L −1 for treating toluene-in-water emulsion (a mean droplet size of 650 nm) was achieved. The separation performance is obviously superior to the hydrophilic membrane without hydrophobic layers intercalated structure. Our work provides a new strategy for developing hydrophilic-hydrophobic composite membranes to alleviate the trade-off between permeating flux and separation efficiency in oil/water emulsion separation through rationally designing the membrane structure.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yongqiang Zhang,Xin Tan,Xiao Liu,Chunshan Li,Shaojuan Zeng,Hui Wang,Suojiang Zhang
Molecularly imprinted membranes with multifunctional layers for artemisinin separation and purification were fabricated on porous chitosan membranes. The molecularly imprinted layer was fabricated through an in situ activator generated by electron transfer–atom transfer radical polymerization method by using artemisinin as the templet molecule. Properties of the prepared materials were characterized by SEM, IR, XPS, EDS, AFM, etc. Adsorption ability and dynamics, permeation capacity, and reusability have been investigated. Results indicate that this kind of molecularly imprinted membrane possesses desirable adsorption ability for artemisinin (18.89 mg/g) and permselectivity factors (β) as high as 2.15 and 2.03 toward artemether and artesunate, respectively. Mechanism of selective adsorption and permeation was unveiled by molecular simulation, which indicates that the tailor-made recognition sites on the membrane possess higher interaction force toward artemisinin than artemether or artesunate, resulting in artemisinin adsorption by the membrane and separation of this drug from its analogues. The method developed here provides an environmental friendly and sustainable technology for separation and purification of natural products.
研究领域:
材料科学
·
药物化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）