Coatings
·
2022
·Vol. 12
·期 11
·1729
·
IF 3.236
Cong-Cong Luan,Yu-Ping Zhang,Cheng-Xing Cui,De-Liang Chen,Yuan Chen,Meng-Jun Chen
In this paper, a novel pH-responsive brass mesh modified by 3-mercaptobenzoic acid (MBA) and 2-naphthalenethiol (NPT) was demonstrated via a facile chemical etching method followed by surface modification. The smart wettability was dependent on the assembled MBA and NPT with suitable thiol proportions. The on–off control of water penetrating intelligently into the nanostructured brass mesh substrate was carried out by the pH change in the outside environment. The brass mesh modified with XNPT= 0.4 (mole fraction of NBT in the mixed solution) exhibited the strongest pH responsivity from superhydrophobicity to superhydrophilicity. Furthermore, the resulted Janus membrane (JM) fabricated by the integration of a smart brass mesh and hydrophobic Ni foam could be used as a water diode in air and liquid systems. Unidirectional penetration for the water droplet was realized by the resulting smart JM with a hydrophobic upper layer and a pH-responsive layer below.Keywords:smart material;brass mesh;3-mercaptobenzoic acid;2-naphthalenethiol;Janus membrane
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
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Jiahui Zhao,Guoyong Liu,Jian Sun,Qifeng Wang,Zong-Jun Li,Xiurong Yang
Analyte-responsive chromo-fluorogenic reactions under accessible conditions are important for designing small-molecule spectroscopic probes. We describe a series of newly constructed motifs based on the chromo-fluorogenic reaction between catechol derivatives (typically hydroxytyrosol, dopamine, and levodopa) and naphthoresorcin (NR) in aqueous solution under ambient conditions. The weakly absorptive and fluorogenic catechols/NR was converted to products having visible absorption and bright fluorescence within several minutes. The chromo-fluorophores produced from this reaction had a maximum absorbance at 458 nm and emission at 480 nm with high fluorescence quantum yields (30–84%). Inspired by the tyrosinase-catalyzed hydroxylation of monophenols to catechols, the tyrosinase-enabled chromo-fluorogenic reaction was verified by using monophenol (typically tyrosol) as the substrate. In this regard, a dual-readout tyrosinase activity assay was developed by virtue of the in situ “turn-on” optical signals. Furthermore, a test of tyrosinase inhibition, by using a common inhibitor kojic acid, demonstrated the potential of the chromo-fluorogenic reaction for developing other tyrosinase related assays and signal transduction.
研究领域:
生物化学
·
分析化学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Biomaterials Science & Engineering
·
2017
·
IF 3.234
Jie Feng,Limin Chen,Yuanzhi Xia,Jie Xing,Zihou Li,Qiuping Qian,Yan Wang,Aiguo Wu,Leyong Zeng,Yunlong Zhou
Gold nanobipyramids (Au NBPs) with two sharp tips present an extremely strong electric field enhancement, which endows them with more advantages in biomedical photonics than other gold nanostructures. The application of Au NBPs for diagnosis and therapy is now under intensive investigation. Here, we report Au NBPs for surface-enhanced Raman scattering (SERS) detection and photothermal therapy (PTT) of MCF-7 cancer cells both in vitro and in vivo via bioconjugation with Raman reporter 2-naphthalenethiol (2-NAP) and folic acid (FA). The results showed that bioconjugated Au NBPs not only could be used for the quantitative detection of the MCF-7 cells in the range of 5–500 cells/mL, but also lead to the enhanced Raman signal in MCF-7 tumor-bearing nude mice with high specificity. Moreover the bioconjugated Au NBPs exhibited excellent photothermal performance in both in vitro and in vivo therapies, in which the cell viability decreased to 6.44% and the relative volume of MCF-7 tumors treated with bioconjugated Au NBPs reduced to 0.037 under the irradiation of an 808 nm laser. Our results indicate that bioconjugated Au NBPs offer an excellent nanoplatform for PTT and SERS detection in the future.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2018
·
IF 1.355
Qiang Zou,Xin Li,Tao Xue,Shentong Mo,Qi Su,Jia Zheng
A surface-enhanced Raman scattering (SERS) platform for the selective trace analysis of Hg2+ ions was reported, based on poly-thymine (T) aptamer/2-naphthalenethiol (2-NT)-modified gold nanoparticles (AuNPs), which was an oligonucleotide-functionalized nanosensor and SERS chip. 2-NT was used as a Raman reporter, and T aptamer could form a T-Hg2+-T structure with Hg2+ ions making an SERS nanosensor absorbed to the SERS chip. The optimum concentrations of DNA and 2-NT were obtained. An average of 960 DNA molecules attached to each AuNP were measured. The limit of detection (LOD) was 1.0 ppt (1.0 × 10−12 g/mL), which is far below the limit of 10.0 ppb for drinking water, stipulated by the World Health Organization. The sensor has the advantages of low detection cost, a simple sample pretreatment, a green solution and reducing false positives. Furthermore, the nanosensor was used for the determination of trace Hg2+ in the water of a lake; a reliable result was obtained accurately.
研究领域:
分析化学
·
环境科学
·
纳米技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jing Tang,Huimin Sun,Xiuting Li,Fangchu Liang,Tao Jiang
Breaking the limitation of smooth silver nanowires (Ag NWs) in forming sufficient “hot spots” is a crucial step to push them into practical surface enhancement Raman scattering (SERS)-based detection. Herein, Ag NWs with various etched configurations were developed by utilizing different amounts of aqua regia as etchant at room temperature . Compared with the smooth Ag NWs, more electromagnetic “hot spots” were enabled by the etched one, which exhibited better sensitivity and uniformity in SERS signals. The limit of detection (LOD) for 2-naphthalenethiol (2-NAT) obtained from the optimized substrate could reach 8.3 × 10 −10 mol/L and the relative standard deviation (RSD) was 6.8%. The maximum enhancement factor (EF) value obtained as 3.34 × 10 6 was even three times higher than that of the smooth one. Finally, an ultra-sensitive detection of thiram with a lowest detectable concentration of 4 × 10 −8 mol/L was facilitated by the optimal etched Ag NWs.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）