Droplet
·
2026
·Vol. 5
·期 1
·e70049
·
IF 9.1
Zebing Mao,Chao Luo,Yanhong Peng,Yang Li,Yile Chen,Sirui Pan,Junji Ohgi,Weidi Huang,Jianhua Zhang,Bing Xu
Miniaturized functional fluidic pumps have found broad applications across various fields; however, the fabrication and dimensional limitations of their electrodes remain a significant challenge. Conventional manufacturing techniques often fail to achieve high aspect ratio structures exceeding 2 and electrode heights greater than 1 mm. In this work, we propose a novel extreme microfabrication strategy that integrates flexible molding techniques with advanced microfabrication processes to develop high-precision pump electrodes. These electrodes are successfully implemented in droplet manipulation applications. First, we selected suitable microfabrication-compatible materials and developed a conductive, flexible liquid elastomer, along with a tailored fabrication process. Next, a functional working fluid compatible with the electrodes was synthesized and characterized in terms of its viscosity, electrical conductivity, dielectric constant, and interfacial behavior with aqueous phases. A corresponding microfluidic chip was also fabricated to assess its droplet generation performance. Both duty cycle-based and frequency-based droplet manipulation strategies were investigated using this chip. Finally, a machine learning approach was employed to model the droplet generation process and evaluate the influence of four key parameters on device performance. This study establishes a foundational platform and design pathway for future development of integrated on-chip pumping systems in microfluidic applications.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Hui Yang,Tianrui Chen,Haifeng Wang,Shengchi Bai,Xingzhong Guo
Silver nanowires (AgNWs) with high aspect ratio were rapidly one-pot synthesized by a polyol process in the presence of polyvinylpyrrolidone (PVP) as a stabilizer as well as the anisotropic agent, and the corresponding transparent conductive films were prepared by spin-coating method. The effects of PVP molecular weight and concentration on the morphology and aspect ratio of AgNWs were investigated in detail, and the optoelectrical properties of the transparent conductive films were briefly introduced. The presence of PVP induces the growth of silver directed to form high aspect-ratio nanowires by a high anisotropic mode. Appropriate PVP molecular weight and concentration allows the rapid synthesis of AgNWs with the diameter of about 78.2 nm, the length of 79.52 μm and the aspect ratio as high as 1009.2. The as-prepared AgNWs films possess a transmittance of 81.6% and a sheet resistance of 11.36 Ω/sq. The resultant AgNWs with high aspect ratio can be applied to prepare transparent conductive electrodes.
研究领域:
材料科学
·
纳米技术
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高影响因子
SOLID STATE PHENOMENA
·
2018
·
IF 0
Li Qian Cheng,Mei Feng,Kai Chen
Single crystalline lead-free (K, Na)NbO3 (KNN) nanostructures have attracted much attention for the high piezoelectricity and environmental compatibility. Especially, the plate-like KNN structures are supposed to be utilized in the synthesis of textured KNN-based ceramics. The KNN plate-like templates were prepared by a two-step molten salt reaction. The layered-perovskite Bi2.5Na3.5Nb5O18 (BNN5) was first prepared by using Bi2O3, Nb2O5, Na2CO3, NaCl as raw materials. The BNN5 precursors possess high aspect ratio with an average size of 15 - 20 μm in width and 0.5 - 1 μm in thickness. Then Bi element in the BNN5 was replaced by Na/K through topochemical reaction, and KNN plate-like products which have anisotropic crystal structure were fabricated. It should be emphasized that piezoresponse force microscopy (PFM) was used to confirm three-dimensional (3-D) morphology, while piezoelectric properties of single crystalline KNN platelets were acquired simultaneously. The as-synthesized KNN structures are expected to play an important role in the study of textured KNN ceramics. Meanwhile, the methodology investigated in this paper can also be applied for further fundamental studies on KNN system as well as other lead-free piezoelectric materials.
研究领域:
材料科学
·
无机化学
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 16
·6473-6480
·
IF 8.067
Junhan Guo,Yang Tang,Longtao Li,Pengcheng Jia,Bo Song,Xin Liu,Xiaomeng Li,Zhenbo Deng,Zhidong Lou,Yufeng Hu,Feng Teng,Liang Qin,Yanbing Hou
Micro–nano cesium lead halide perovskites have become one of the most potential materials for optoelectronic applications due to their excellent photoelectric properties such as tunable band gap, high absorption efficiency, long carrier diffusion length, and high stability. Although significant efforts have been made to grow CsPbBr3 single crystal perovskites via solution processing, it is difficult to prepare discrete high-quality factors and small volumes of Fabry–Pérot (F–P) mode and whispering-gallery-mode (WGM) optical resonators on the substrate due to random nucleation and excessive nucleation points, which lead to the accretion of a large number of crystallites. In this work, CsPbBr3 crystallites with different aspect ratios have been prepared on poly[bis(4-phenyl) (2,4,6-trimethylphenyl) amine] (PTAA) modified glass substrates by combining the control of evaporation rate of anti-solvents with the coffee ring effect and Marangoni effect. Due to the hydrophobic properties of PTAA, the nucleation points are significantly reduced, resulting in the growth of high-quality and robust single crystals separated from each other. These crystallites exhibit a high-quality factor (Q = 1200–1600) with a threshold of 10–20 μJ cm−2. The results indicate that the prepared CsPbBr3 crystallites can be used as promising micro–nano F–P and WGM lasers.
研究领域:
材料科学
·
光学
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高影响因子
CORROSION SCIENCE
·
2026
·
IF 10.3
Yue Liu,XiangLi Shen,ZhiHui Xie,Xiaoqiang Fan
Simultaneously enhancing the corrosion resistance and mechanical durability of epoxy (EP) coatings remains a substantial challenge for long-term safe-guarding of metallic structures in aggressive environments. Covalent organic frameworks (COFs) have emerged as promising protective nanofillers, but their applications predominantly rely on physical barrier effects, leaving the potential of their functional pore channels for metal-ion coordination largely unexploited. Herein, inspired by the intrinsic metal-ion adsorption capability of COFs, we reversely harnessed their functional pore channels to immobilize cerium cations through a pore-confinement and coordination strategy. This approach led to the construction of rare-earth functionalized COFs, namely spherical Ce@TATP and high-aspect-ratio Ce@TADM, which integrate both passive and active protection functions. The high-aspect-ratio TADM, owing to its highly ordered pore channels and abundant nitrogen/oxygen-rich coordination sites, enabled efficient cerium anchoring. The synergistic integration of the high-aspect-ratio TADM barriers and pH-responsive cerium inhibition effectively impeded the transport of corrosive species. The resulting coating exhibited a charge-transfer resistance of 1.29 × 10 7 Ω·cm 2 and a corrosion protection efficiency of 88.5% after 4 weeks of immersion in 3.5 wt% NaCl solution. More importantly, cerium coordination achieves mechanical reinforcement of the composite coating and improves its load-bearing capability and resistance to plastic deformation, as evidenced by the H 3 / E r 2 value rising by 23.3% and 43.0% compared with TADM/EP and pure EP, respectively. Combined with the layered nanoarchitecture of TADM, such coating reinforcement lowers the wear rate by 65.04% relative to pure EP. This work establishes the structure-property relationship linking COF nanoarchitectures, cerium incorporation and multifunctional protective performance, providing a novel strategy to construct advanced anti-corrosion and anti-wear coatings.
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ACS Applied Nano Materials
·
2026
·Vol. 9
·期 31
·14804-14813
·
IF 5.8
Wang Shuai-Qi,Jiang Wen-Ya,Deng Zhe-Di,Shi Shuang,Chen Shi-Rong,Ye Peng,Li Jing-Zhe,Wei Jian-Yu,Wu Zi-Ran,Liu Kuan-Guan
The atomically precise synthesis of high-aspect-ratio
metal clusters
represents a promising yet challenging approach to boost photothermal
performance, given that their assembly mechanisms remain poorly understood.
Herein, we present a mixed-ligand synthetic route to three atomically
precise silver-alkynyl clusters─[Ag 6 (RC≡C) 4 ( 3S ) 4 ](OTf) 2 (R = Ph/4-FPh, Ag 6 -H and Ag 6 -F ) and [Ag 12 (4-MeOPhC≡C) 8 ( 3S ) 6 ](OTf) 4 ( Ag 12 -OMe ), by employing substituent-engineered
phenylacetylene ligands and 1,3,5-trithiane ( 3S ). Single-crystal
X-ray diffraction reveals that Ag12-OMe adopts a distinctive
rod-shaped Ag 12 core via directional fusion of three coplanar
Ag 6 octahedra─a significant evolution from the isolated
octahedral cores in Ag 6 -H and Ag 6 -F . Stability of the Ag 6 core originates from the synergistic
coordination of cis -μ 3 -η 1 ,η 1 ,η 1 3S ligands
and μ 3 -alkynyl ligands. By contrast, assembly of
the elongated Ag 12 core is driven by μ 4 -coordination of the alkynyl ligands and argentophilic Ag···Ag
interactions. Notably, Ag 12 -OMe exhibits a substantially narrowed energy gap and enhanced
optical absorption. Femtosecond transient absorption (fs-TA) results
indicate that the rod-shaped core significantly promotes nonradiative
decay, achieving a solution-phase photothermal conversion efficiency
5.4 times higher than that of Ag 6 -H . This work provides fundamental insights into the
assembly mechanism of high-aspect-ratio clusters and establishes a
definitive structure–property relationship to guide the development
of advanced photothermal materials.
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高影响因子
Small Methods
·
2022
·Vol. 6
·期 8
·2200329
·
IF 15.367
Dachuang Shi,Yun Chen,Zijian Li,Shankun Dong,Liyi Li,Maoxiang Hou,Huilong Liu,Shenghe Zhao,Xin Chen,Ching-Ping Wong,Ni Zhao
Wet etching of silicon carbide typically exhibits poor etching efficiency and low aspect ratio. In this study, an etching structure that exploits anisotropic charge carrier flow to enable high-throughput, external-bias-free wet etching of high-aspect-ratio SiC micro/nano-structures is demonstrated. Specifically, by applying a catalytic metal coating at the bottom surface of a SiC wafer while introducing patterned ultraviolet light illumination from its top surface, spatial charge separation across the wafer is achieved, i.e., photogenerated electrons are channeled to the bottom to participate in the reduction reaction of an oxidant in the etchant solution, while holes flow to the top to trigger oxidation of SiC and subsequent etching. Such design largely suppresses recombination-induced charge losses, and when used in combination with a top metal catalyst mask, the structure yields a remarkable vertical etching rate of 0.737 µ m min −1 and an aspect ratio of 3.2, setting new records for wet-etching methods for SiC.
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·142
·
IF 36.3
Fan Binbin,Yu Jianyong,Wang Xueli,Si Yang,Tang Peixin
Covalent organic framework nanofibers (CNFs) with biomimetic scale-like architecture, record-high aspect ratio ( L / D = 103.05), and superior flexibility were directly synthesized via defect engineering.
Self-standing membranes and nanofibrous aerogels (CNF-As) with designable micro-topological structures were fabricated with 100% CNFs.
CNF-As perform photo-induced uranium extraction with an adsorption capacity and adsorption rate of 920.12 mg g −1 and 89.9%, respectively.
CNF-As exhibit superior underwater stability (> 180 days) and superelasticity (~ 0% deformation after 500 compression cycles), making them promising for practical application in marine systems.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 16
·50244
·
IF 2.52
Congcong Zhu,Jinghua Yin,Jialong Li,Yanpeng Li,He Zhao,Dong Yue,Lin Pan,Jimin Wang,Yu Feng,Xiaoxu Liu
To enhance the discharge energy density ( U e ) of polyvinylidene fluoride (PVDF), two-dimensional (2D) titania nanosheets (TNSs) with high aspect ratio were introduced into PVDF. The results show that the TNSs are uniformly dispersed in matrix and the existence of matrix-filler interface is confirmed by small angle X-ray scattering. Introducing of high aspect ratio TNSs is beneficial to enhance the concentration of polar β-phase and interfacial polarization, which can improve the permittivity ( ε r ) of nanocomposites. Meanwhile, the shape of 2D TNSs plays an important role in enhancement of breakdown strength ( E b ). The ε r and E b of the nanocomposites are two significant factors of their high energy storage performance. Therefore, the U e increases to 0.32 J/cm 3 , which is 28% higher than that of pure PVDF (~0.25 J/cm 3 ). The energy efficiency of this typical nanocomposite is similar as that of pure PVDF (~90%). This work might provide a method of fabricating promising energy storage dielectric materials.
研究领域:
材料科学
·
纳米技术
·
能量存储
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 6
·47054
·
IF 1.901
Changzeng Yan,Tianhang Yu,Chao Ji,Xiaoliang Zeng,Jibao Lu,Rong Sun,Ching-Ping Wong
Heat removal via thermal management materials is attracting more and more attention in the electronic industry. Conventional particle/polymer thermal conductive composites require a high filler loading ratio (>30 vol %), which cause severe thermal interfacial resistance and mechanical issue. In this work, we fabricate tellurium nanowires (NWs)/epoxy nanocomposites via a facile bar coating method. According to Agari model and Maxwell–Eucken model, the as-synthesized ultra-long NWs with high aspect ratio (>100) construct the 3D interconnected thermal conductive network better in resin matrix to facilitate the heat transfer process. The results show that at a low loading ratio of 2.4 vol %, this nanocomposite exhibits the out-of-plane and in-plane thermal conductivity of 0.378 and 1.63 W m −1 K −1 , respectively, which is 189 and 715% higher than that of pure epoxy resin. Importantly, good stability, and flexibility of nanocomposites are well maintained. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47054.
研究领域:
材料科学
·
热管理材料
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Weiqing Wu,Luchan Lin,Yifan Hu,Junde Ji,Xinde Zuo,Yiwei Yu,Qianyi Zhang,Zhengjie Cai,Zhuguo Li
Ultralong graphene nanoribbons (GNRs) have drawn much attention in the field of high performance nanoelectronics. In this work, a mask-free ultrafast laser lithography method is demonstrated for the mass production of ultralong GNR arrays with an intact carbon network. The longest GNR reaches ∼42 μm with a width of ∼400 nm. The orientation of the as-received GNR arrays is always parallel to the incident laser polarization direction. Original carbon network structures of remaining GNRs are preserved, which are ascribed to the precise energy injection and selective nanoablation in graphene flakes. The formation of large-scale GNR arrays is mainly determined by the interference between the incident laser and the stimulated transverse electric mode surface plasmon (TE-SPs) wave. The excitation of the TE-SPs wave prefers to be triggered at the geometrical fluctuations on ablated graphene surfaces as well as the interface with a large discrepancy of dielectric permittivity (e.g., graphene and SiO2). With the initial generation of the nanoablated groove on the surface, the interference between TE-SPs waves and incident laser beams further extends to the far end with periodic intervals, which results in the continuous formation of GNRs. This ultrafast laser-induced periodic lithography may provide an alternative for ultralong and high aspect ratio GNR array fabrication, which is promising in high performance nanodevice development.
研究领域:
材料科学
·
纳米技术
·
光学工程
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 14
·145601
·
IF 3.551
Rui Li,Xinyan Li,Ping-An Yang,Haibo Ruan
High-performance iron nanowires have attracted wide attention from researchers due to their 'controllable' arrangement distribution by magnetic fields. In this paper, a simple magnetic field assisted in situ reduction method was proposed to synthesize Fe NWs with high aspect ratio, small-diameter, and good dispersion. A detailed parametric study determining the relationship among the final morphologies of the products and magnetic field, injection sequence of sodium borohydride that was injected into ferrous sulfate heptahydrate, reactant concentration, and injection rate is presented. The as-synthesized Fe NWs were analyzed by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy and vibrating sample magnetometry. A plausible mechanism for the formation of high-aspect-ratio Fe NWs is proposed. The SEM images showed the dependence of the NWs morphology and aspect ratio on synthesis parameters. Magnetic field and injection sequence showed considerable influences on the synthesis of high-aspect-ratio Fe NWs. In the absence of magnetic field or with the changes in injection sequence, only the Fe flakes were obtained. The NWs diameter decreased, and the aspect ratio increased with the increase in injection rate. The FeSO4·7H2O and NaBH4 concentration considerably influenced the aspect ratio of the product, which increased first, decreased, and then increased again with the increase in FeSO4·7H2O concentration. Meanwhile, the product aspect ratio increased and then became saturated with the increase in NaBH4 concentration Thus, an optimum synthesis process was obtained, with the average aspect ratio of 350, and the average diameter of 60 nm. The results reported in this paper provide a basis for optimizing the growth of Fe NWs by magnetic field-assisted method.
研究领域:
材料科学
·
纳米技术
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PubMed
高影响因子
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