Materials
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2023
·Vol. 16
·期 14
·5168
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IF 3.4
Xiaoqiang Zhang,Hongyue Chen,Zhijun Wang,Nan Wang,Duyang Zang
We studied the evaporation-driven crystallization in the droplets of sodium acetate anhydrous (CH3COONa) aqueous solution, which were deposited on superhydrophobic substrates. The results reveal distinct crystallization behaviors between saturated and unsaturated droplets under identical experimental conditions. Specifically, unsaturated droplets could form a quasi-spherical crystal shell on the superhydrophobic substrate, while saturated droplets could develop crystal legs between the droplet and substrate when the crystal shell formed. Subsequently, the saturated droplet was lifted off the substrate by the growing crystal legs. The formation of crystal shell was closely associated with the evaporation from the droplet surface and the internal convection inside the droplet. The formation of crystal legs was induced by the heterogeneous nucleation effect caused by the substrate of SiO2nanoparticles. These findings provide valuable insights into regulating the morphology of salt crystallization through adjustments in salt solution concentration and substrate surface structure.Keywords:superhydrophobic substrate;droplet evaporation;crystallization;internal convection;crystallization pressure
研究领域:
材料科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Dechan Lu,Dandan Su,Yi Yang,Rongmao Qiu
Uric acid (UA), the terminal metabolite of purine catabolism, is a critical biomarker requiring precise monitoring. Conventional detection methods (e.g., enzymatic assays, HPLC) suffer from limited sensitivity and operational complexity. To address this, we engineered four colloidal SERS substrates (Ag NPs, Au Ag NPs, Au NPs, Au NRs) for signal amplification and fabricated hydrophobic surfaces via hydrochloric acid etching and evaporative deposition of heptadecafluorodecyl trimethoxysilane to minimize analyte dispersion. Integration of optimized Ag NPs with the hydrophobic substrate enabled quantitative UA detection by SERS. This approach achieves rapid (∼1 min), demonstrating significant potential for point-of-care UA monitoring.
研究领域:
分析化学
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纳米技术
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生物医学工程
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光谱学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhongshun Wang,Qunyan Zhu,Chang Liu,Kun Chen,Yuheng Fu,Bingbing Xie,Lin Zhang,Wensheng Yang
Achieving highly sensitive surface-enhanced Raman scattering (SERS) detection requires precise collection of trace target analyte molecules into small hot spot regions. In this study, we propose a convenient and cost-effective method to construct a high-performance SERS platform based on the super-hydrophobic delivery (SHD) effect to overcome the diffusion limit during sample evaporation. A paper based super-hydrophobic substrate (PBSH substrate) was employed as a concentrator to enrich the analytes, along with SiO 2 @Au core-satellite structures (SiO 2 @Au CSSs) to form “molecule in hot spot” matrices. Benefiting from the SHD effect and the high SERS activity of SiO 2 @Au CSSs in three-dimensional space, we achieved excellent SERS sensitivity and reproducibility. This platform exhibits a good linear response for detecting Rhodamine 6G (R6G) across concentration ranges from nanomolar (10 −7 M) to femtomolar (10 −13 M) levels, with a low relative standard deviation (RSD) of 6.42 % observed across 30 randomly selected spots. Moreover, the platform enables sensitive detection of various contaminants and multicomponent residues of pesticides and organic dyes in real samples, exhibiting great practical potential in the field of food safety.
研究领域:
分析化学
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食品安全
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纳米技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yihua Zheng,Chengchun Zhang,Jing Wang,Liang Yang,Chun Shen,Zhiwu Han,Yan Liu
Extensive studies of antiwetting have been restricted to stationary substrates, while dewetting mechanisms on moving interfaces are still poorly understood. Due to the hydrophobic and anisotropic surface characteristics of kingfishers, they are able to easily change flight direction even under high-intensity precipitation. The present study aims to mechanistically analyze how the synergy of interfacial movement, anisotropy, and superhydrophobicity affects rapid dehydration. We have designed a droplet-conveyor system to simulate the bouncing of droplets on moving anisotropic superhydrophobic targets and performed simulations via the lattice Boltzmann algorithm. The moving interface can induce a directional tumbling behavior of the droplet and effectively avoid continuous wetting in the same region. We found that droplet tumbling is essentially caused by transformed depinning velocity vectors at the interface downstream. Also, the hang time of a tumbling droplet is positively related to the angle between the motion vector and the texture. The oriented anisotropic motion facilitates the tumbling of droplets and decreases their hang time by up to 23% as compared to that on a stationary inclined superhydrophobic surface. Similar interfacial process dehydration also occurs on a nonwet kingfisher flying in the rain, and we believe that these findings provide valuable new insights for high-efficiency water repellency of surfaces.
研究领域:
材料科学
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流体力学
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生物物理学
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表面科学
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DOI
PubMed
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2017
·
IF 2.334
Yuan-Yuan Xue,Wen-Tao Zhang,Meng-Yue Zhang,Li-Zhi Liu,Wen-Xin Zhu,Ling-Zhi Yan,Jing Wang,Yan-Ru Wang,Jian-Long Wang,Dao-Hong Zhang
Microfluidic paper-based analytical devices (μPADs) have a significant potential in developing portable and disposable point-of-care testing (POCT). Herein, a facile, rapid, cost-effective and environment friendly strategy for μPADs fabrication is proposed. Specifically, the substrate paper was hydrophobized by coating with trimethoxysilane (TOS), and then the selected area was hydrophilized by treating with surfactant. The whole fabrication process was implemented within 7 min, with no need for complex pre-treatment, high-temperature and special equipment. As a proof-of-concept application, the as-prepared μPAD was applied to determination of the glucose content in human serum samples. The results agreed well with those obtained by a glucometer. We believe that the μPADs fabrication method proposed here could provide a facile, rapid and low-cost reference for other related studies.
研究领域:
分析化学
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生物医学工程
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即时诊断
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Bingqian Lv,Yunqing Wang,Rongchao Mei,Yan Li,Xizhen Zhao,Qi Yuan,Hui Xu,Lingxin Chen
In situ, fast, sensitive detection of drugs in blood is in great demand in many clinical scenarios. Surface-enhanced Raman spectroscopy (SERS) has shown great potential in drug analysis; however, achieving highly sensitive detection using a portable Raman instrument is still challenging. Herein, a superhydrophobic silver-film-assisted 3D SERS platform was proposed for sensitive detection of drugs in plasma. The superhydrophobic silver film was prepared through the self-assembly of silver nanoparticles (Ag NPs) at the liquid–liquid interface. Gold–silver core–shell (Au@Ag) nanoparticles (NPs), encoded with an internal standard signal, were mixed with the plasma sample. The mixture formed nanocomposites on the superhydrophobic silver film, creating abundant 3D hotspots that greatly enhanced the signal of the analytes. The 3D platform enabled the detection of crystal violet as low as 10–13 M, and a relative standard deviation (RSD) of 13.4% using a research-grade Raman spectrometer. Furthermore, mitoxantrone and methylene blue drug analysis in plasma was performed by using a portable Raman spectrometer, which could be detected at as low as 8 × 10–10 and 3 × 10–8 M, respectively, with an improved signal repeatability (RSD 2.5%). Based on this technique, the pharmacokinetics of the two drugs postintravenous injection in mice was investigated. This work provided a facile and sensitive protocol for plasma drug analysis, showing great promise for the popularization of portable Raman spectroscopy in real clinical applications.
研究领域:
分析化学
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药学
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生物医学工程
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临床诊断
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产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Zhu Qing Li,Du Cong,Dai Yahao,Daab Matthias,Matejdes Marian,Breu Josef,Hong Wei,Zheng Qiang,Wu Zi Liang
Many creatures have the ability to traverse challenging environments by using their active muscles with anisotropic structures as the motors in a highly coordinated fashion. However, most artificial robots require multiple independently activated actuators to achieve similar purposes. Here we report a hydrogel-based, biomimetic soft robot capable of multimodal locomotion fueled and steered by light irradiation. A muscle-like poly( N -isopropylacrylamide) nanocomposite hydrogel is prepared by electrical orientation of nanosheets and subsequent gelation. Patterned anisotropic hydrogels are fabricated by multi-step electrical orientation and photolithographic polymerization, affording programmed deformations. Under light irradiation, the gold-nanoparticle-incorporated hydrogels undergo concurrent fast isochoric deformation and rapid increase in friction against a hydrophobic substrate. Versatile motion gaits including crawling, walking, and turning with controllable directions are realized in the soft robots by dynamic synergy of localized shape-changing and friction manipulation under spatiotemporal light stimuli. The principle and strategy should merit designing of continuum soft robots with biomimetic mechanisms.
研究领域:
材料科学
·
机器人技术
·
生物力学
✓ 已验证
DOI
PubMed
高影响因子
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