CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jin Qin,Zuo Tian,Gang Chen,Yu Zhao
Bismuth-based semiconductor materials have garnered significant attention because of their appropriate optical bandgap and substantial photoelectric conversion efficiency. Enhancing the photocurrent and fill factor of photovoltaic films is essential for developing high-performance optoelectronic devices. In this study, high-performance BiVO 4 -ZnTiO 3 multilayer films were fabricated using a straightforward sol-gel method, where the incorporation of ZnTiO 3 films significantly improved the photovoltaic performance of BiVO 4 . Through structural design aimed at enhancing light utilization, the BiVO 4 -ZnTiO 3 multilayer film achieved a photocurrent density of 1.9 mA/cm 2 at 450 nm, along with a fill factor of 46.8 % in the composite multilayer structure. The improvement in film performance is attributed to the overall multilayer stacking effect. This study offers a novel approach for utilizing bismuth-based semiconductors in optoelectronics.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Coatings
·
2019
·Vol. 9
·期 11
·745
·
IF 2.33
Linyun Zhang,Chongxing Huang,Hui Zhao
In this work, some multilayer coatings (two-layer, four-layer or six-layer) based on pullulan and chitosan for protecting papayas were prepared by the layer-by-layer technique. The papayas were coated by immersion and stored at 25 °C, 50% relative humidity or up to 14 days. Uncoated and monolayer-coated papayas were used as controls. The pullulan/chitosan coatings decreased the papaya weight loss, softening, color change (b*, ΔE), and pH, retarded the fall of titratable acidity and vitamin C, and maintained respiratory rate and soluble solid contents. Sensory quality evaluation demonstrated that pullulan/chitosan coatings effectively preserved papaya flavor and overall acceptance. In general, the four-layer coatings provided the best fruit preservation. In conclusion, multilayer pullulan/chitosan coatings are efficient in maintaining the post-harvest quality and prolonging the shelf life of fresh papaya.Keywords:papaya;preservation;pullulan;chitosan;multilayer coating
研究领域:
食品科学
·
植物生理学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 36
·2401733
·
IF 27.4
Xin Wang,Xiaoming Chen,Qingyuan He,Yaozu Hui,Chaofan Xu,Baichuan Wang,Feihu Shan,Jie Zhang,Jinyou Shao
To obtain high-performance electromagnetic microwave (EM) absorption materials with broad effective absorption bandwidth ( EAB ) and reduced thickness, designing structures has proved to be a promising way. Herein, ultra-broadband multilayer bidirectional MXene/polyimide EM absorption aerogels containing multi-structures on scales ranging from the micro- to the macroscale are produced with the aid of electric and temperature fields. On the microscale, under the action of electric force and temperature gradient, the ordered structures made of aligned Ti 3 C 2 T x MXene nanosheets and the microscale layered aerogel walls enable the bidirectional aerogel to achieve a wide EAB of 8.58 GHz at a thickness of 2.1 mm. This is ascribed to the numerous aligned nanosheets and layered aerogel walls perpendicular to the incident EMs, facilitating the conversion of electromagnetic energy into electrical energy. Furthermore, on the macroscale, the multilayer bidirectional aerogel with non-gradient structures effectively resolves the conflict between impedance matching and energy loss, resulting in an ultrawide EAB of 9.41 GHz at a thickness of 3 mm. This innovative design of electric-field-assisted multilayer bidirectional aerogels with multiscale structural coupling may provide feasible and effective pathways for the development of advanced EM absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Ying Lin,Jingjing Dai,Haibo Yang,Lei Wang,Fen Wang
Using Bi 2 Fe 4 O 9 microplatelets as precursors, we developed a facile etching strategy for three-dimensional porous Bi 2 Fe 4 O 9 microspheres with reduced graphene oxide (rGO) multilayered sheets for high-performance electromagnetic (EM) absorbing material. In a solution of N,N dimenthyl formamide (DMF), hydrazine and methyl mercaptoacetate, the precursors synchronously were subjected to a dissolution-recrystallization/reduction process to obtain a hybrid of numerous Bi 2 Fe 4 O 9 fragments and graphene to form the rGO/porous Bi 2 Fe 4 O 9 composite. The porous Bi 2 Fe 4 O 9 microspheres with an mean diameter of 500 nm were uniformly assembled on the graphene multilayered sheets without obvious aggregation. Such three-dimensional structure rGO/porous Bi 2 Fe 4 O 9 composite not only utilize efficiently the high conductivity and specific surface area of graphene, but only the hierarchical architectures of porous Bi 2 Fe 4 O 9 microspheres. The results show that the rGO/porous Bi 2 Fe 4 O 9 composite exhibits a maximum reflection coefficient of −71.88 dB at 13.8 GHz with a sample thickness of only 2.0 mm and an effective absorption bandwidth (reflection loss below −10 dB) of 4.24 GHz, greatly superior to the present graphene-based metallic oxide composite. The strategy paves an efficient way for designing new candidate for lightweight electromagnetic wave (EMW) absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yangyang Gong,Pengtao Zhang,Shuang Fan,Minghui Cai,Jiangtao Hu,Zhaoyan Luo,Hongwei Mi,Xiantao Jiang,Qianling Zhang,Xiangzhong Ren
Ammonium vanadate with stable bi-layered structure and superior mass-specific capacity have emerged as competitive cathode materials for aqueous rechargeable zinc-ion batteries (AZIBs). Nevertheless, fragile N H…O bonds and too strong electrostatic interaction by virtue of excessive NH 4 + will lead to sluggish Zn 2+ ion mobility, further largely affects the electro-chemical performance of ammonium vanadate in AZIBs. The present work incorporates polypyrrole (PPy) to partially replace NH 4 + in NH 4 V 4 O 10 (NVO), resulting in the significantly enlarged interlayers (from 10.1 to 11.9 Å), remarkable electronic conductivity, increased oxygen vacancies and reinforced layered structure. The partial removal of NH 4 + will alleviate the irreversible deammoniation to protect the laminate structures from collapse during ion insertion/extraction. The expanded interlayer spacing and the increased oxygen vacancies by the virtue of the introduction of polypyrrole improve the ionic diffusion, enabling exceptional rate performance of NH 4 V 4 O 10 . As expected, the resulting polypyrrole intercalated ammonium vanadate (NVOY) presents a superior discharge capacity of 431.9 mAh g −1 at 0.5 A g −1 and remarkable cycling stability of 219.1 mAh g −1 at 20 A g −1 with 78 % capacity retention after 1500 cycles. The in-situ electrochemical impedance spectroscopy (EIS), in-situ X-ray diffraction (XRD), ex-situ X-ray photoelectron spectroscopy (XPS) and ex-situ high resolution transmission electron microscopy (HR-TEM) analysis investigate a highly reversible intercalation Zn-storage mechanism, and the enhanced the redox kinetics are related to the combined effect of interlayer regulation, high electronic conductivity and oxygen defect engineering by partial substitution NH 4 + of PPy incorporation.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 13
·期 1
·111
·
IF 2.972
Xia Zhao,Shuai Yuan,Zuquan Jin,Binbin Zhang,Nazhen Liu,Shibo Chen,Shuan Liu,Xiaolin Sun,Jizhou Duan
Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work introduced a composite film fabricated on a 2A12 aluminum alloy surface, including an anodic oxide film, a sol–gel film, and a layer-by-layer (LBL) self-assembling film from bottom to top. The microstructure and elemental characterization indicated that the finish of the coating with the LBL film resulted in a closely connected multilayered coating with a smoother surface. The anticorrosion performance was systematically evaluated in the simulated corrosive medium and neutral salt spray environment. The integrated coating with the LBL film presented an excellent anticorrosion ability with system impedance over 108Ω·cm2and a self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in a salt spray environment, the multilayered coatings could still show a good protective performance with almost no cracks and no penetration of chloride ions. It is believed that the as-constructed multilayered coating with high corrosive properties and a fine surface state will have promising applications in the field of anticorrosion engineering.Keywords:multilayer;corrosion;impedance;layer-by-layer
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yan-Mei Zhang,Li-Hao Xu,Xiao-Xue Hu,Bing-Hong Chen,Xin-Ru Chen,Qian-Qian Li,Heng Mao,Zhi-Ping Zhao
Metal-organic framework (MOF) membranes, by virtue of their high selectivity and low diffusion resistance, make a significant contribution to energy conservation and CO 2 emission reduction via separation technology. Despite possessing substantial potential for propelling the production of high-performance membranes, hurdles persist in the process of constructing MOF membranes that are both highly integrated and structurally sound on flexible polymer substrates. We propose a strategy for constructing highly stable cobalt zeolitic imidazolate framework (ZIF-67) composite membranes on seeded polyacrylonitrile (PAN) substrate. Through a timed-interrupted in-situ growth process, the amino-modified polycrystalline ZIF-67 as a CO 2 affinity layer is precisely and completely confined within the “top sites” and partial “face sites” of the vertical layered double hydroxide (LDH) precursor layer, creating a barrier-low passage for CO 2 as a fast diffusion layer. The substrate and the hybrid ZIF-67@LDH layer were robustly anchored together by the pre-embedded LDH seeds, thereby producing an appealing membrane-multilayer interlocked-support (MMIS) composite architecture. This fast diffusion-CO 2 affinity Pebax/ZIF-67@LDH/PAN membranes with MMIS architecture show average CO 2 permeability of 1487 Barrer and CO 2 /N 2 selectivity of above 55.1 after the surface repair coating of polyether-block-amide (Pebax), maintaining stable performance over 150 h, surpassing the Robeson upper bound. The Pebax/ZIF-67@LDH/PAN membranes also exhibit the durability and mechanical robustness, because of the highly inducible activity of LDH precursor layer serving as a linker between the membrane and substrate. These results promote the development of MOF-based membranes in practical separation applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 28
·2302882
·
IF 15.1
Yanan Huang,Jibing Shen,Shuai Lin,Wenhai Song,Xuebin Zhu,Yuping Sun
High-quality few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes are very important for applications and are necessary for clarifying their physicochemical properties. However, the difficulty in etching for themselves and the existence of MC/MC 1−δ and M-Al alloy impurities in their M 4 AlC 3 precursors seriously hinder the achievement of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets. Herein, three different defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are obtained by using a universal synthesis strategy of calcination, selective etching, intercalation, and exfoliation. Comprehensive characterizations confirm their defect-free few-layer structure feature, large interlayer spacing (1.702–1.955 nm), types of functional groups (–OH, –F, –O), and abundant valance states (M 5+ , M 4+ , M 3+ , M 2+ , M 0 ). M 4 C 3 T x (M = V, Nb, Ta) free-standing films obtained by vacuum filtration of few-layer M 4 C 3 T x inks show good hydrophilia, high thermostability, and conductivity. A roadmap on synthesis of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are proposed and three key points are summarized. This work provides detailed guidelines for the synthesis of other defect-free few-layer MXenes nanosheets, but also will stimulate extensive functional explorations for M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets in the future.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS
·
2015
·Vol. 15
·期 4
·8931-8944
·
IF 2.245
Xiang Qian,Jie Xu,Cilong Yu,Yan Chen,Quan Yu,Kai Ni,Xiaohao Wang
Monolithically integrated emitters have been increasingly applied to microfluidic devices that are coupled to mass spectrometers (MS) as electrospray ionization sources (ESI). A new method was developed to fabricate a duplicable structure which integrated the emitter into a poly(dimethylsiloxane) chip corner. Two photoresist layers containing a raised base which guaranteed the precise integration of the electrospray tip emitter and ensured that the cutting out of the tip exerted no influence even during repeated prototyping were used to ease the operation of the process. Highly stable ESI-MS performance was obtained and the results were compared with those of a commercial fused-silica capillary source. Furthermore, chip-to-chip and run-to-run results indicated both reliability and reproducibility during repeated fabrication. These results reveal that the proposed chip can provide an ideal ion source for MS across many applications, especially with the perspective to be widely used in portable MS during on-site analysis.Keywords:microfluidic chip;multi-layer soft lithography;electrospray ionization
研究领域:
分析化学
·
质谱分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jianqiang Ye,Buming Chen,Shixing Wang
The zinc electrowinning process demands considerable energy, prompting the quest for energy-efficient solutions to curtail costs. Hence, the development of energy-saving anode materials for zinc hydrometallurgy is an important issue. Herein, multilayered PbO 2 film materials were prepared through thermal decomposition and composite electrodeposition, yielding a new PbO 2 –ZrO 2 electrode featuring ZrO 2 particles as the second phase for energy-saving zinc electrowinning. The introduction of ZrO 2 leads to reduced PbO 2 crystal size, heightened the specific surface area of the electrode, and preferential growth of crystal planes. Electrochemical tests underscore that the PbO 2 –ZrO 2 electrode manifests a reduced charge-transfer resistance ( R ct ) and overpotential alongside a 46.15 % extension in service life compared to the pure PbO 2 electrode. Simulated zinc electrowinning experiment affirms PbO 2 –ZrO 2 electrode has a 3.63 % surge in the current efficiency and a substantial 244.61 kWh/t reduction in energy consumption relative to the traditional Pb–0.6wt%Ag anode. This study provides a strategic framework for designing and developing cost-efficient, cost-effective anode materials, promoting advancements in energy conservation and consumption reduction within zinc electrowinning processes.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 32
·e55747
·
IF 2.7
Yuhang Wang,Mingyang Liu,Zhengsheng Hu,Hanlin Lv,Yanjun Chen,Yifeng Wang
As an efficient means of material carrying, multilayer capsules are widely used in medicine, agriculture, food safety and other fields. Here, we report a kind of temperature-triggered multilayer capsule with chitosan-sodium dodecyl benzene sulfonate (CS-SDBS) as the shell and gelatin bead containing α-cyclodextrin (α-CD@gelatin) as the core. The α-CD@gelatin/CS-SDBS multilayer capsules can simultaneously encapsulate various substances, such as drugs, fluorescent materials, and nanoparticles. The encapsulated substances do not interfere with each other because they are located in different layers. Both the temperature-sensitive property of gelatin and the host-guest interaction between α-CD and SDBS are utilized to achieve temperature-controlled release of substances in the multilayer capsules. The release rate can be adjusted by the α-CD amount in the gelatin beads. The controlled drug release and chemical detection of the multilayer capsules are studied with sodium salicylate, iodine, and purple cabbage pigment as the carriers. The results show that the α-CD@gelatin/CS-SDBS multilayer capsules have excellent capabilities of encapsulation and controlled release, which are beneficial for their application in the fields of substance encapsulation, drug-controlled release, and chemical detection.
研究领域:
材料科学
·
医药学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xinxin Li,Min Yang,Wenjing Qin,Changshun Gu,Lei Feng,Zhenhao Tian,Hanying Qiao,Junji Chen,Jianxing Chen,Shougen Yin
With the development of wearable intelligent devices, flexible textiles integrate high-performance sensing, electromagnetic shielding and Joule heating show broad application prospects. However, it is still difficult to improve all the performance simultaneously through simple methods. Here, we have prepared MXene/PU composite fiber film with multilayer porous network structure by using the electrospinning spraying alternate operation process. This film has ultra-high sensitivity (GF= 77,751), super large detection range (400%) and ultra-low detection limit (0.05%). Secondly, the multilayer fiber film has excellent EMI shielding performance (EMI SE=38 dB), and the EMI shielding capacity of the multilayer film can still exceed the commercial standard when it is stretched to 20%. Finally, the multilayer fiber film shows better Joule heating performance, including lower voltage drive (2 V) and faster thermal response (12 s). The excellent performance of the composite come from the synergistic effect of MXene and the unique multi-layer porous network structure. Among them, MXene provides excellent conductivity, electrothermal and electromagnetic shielding performance. The layered porous network structure can store the strain in advance and form a parallel circuit, which improves the sensing range, increases the transmission path of electromagnetic waves , and realizes the homogeneity of Joule heating. In addition, the outer PU slows down the invasion of oxygen, thus slows down the oxidation of MXene, and ensures the performance of materials in a long time. The multilayer fiber film has been proved to be suitable for sensing at low temperature, and has broad application prospects in wearability.
研究领域:
材料科学
·
电子工程
·
纺织科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）