ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yuting Lei,Ling Yu,Wei Huang,Haili Yu,Yi He
Facile and rapid detection of iodide ion (I–) has a substantial impact on nuclear chemistry, environmental monitoring, and other fields. Here, we report a new method for visual detection of I– at the single-microbubble level. This assay utilizes the total internal reflection of single O2 microbubble at the O2 microbubble–glass interface to produce the evanescent wave, which is imaged by a dark-field microscope. The diameter of the single O2 microbubble in the H2O2 aqueous solution increases after introduction of I–, thanks to its catalytic ability toward H2O2 decomposition. With this assay, I– is quantitatively determined based on the diameter change of the single O2 microbubble, along with micromolar level sensitivity, and the corresponding dynamic ranges from 0.08 to 1 mM. Impressively, this visual assay possesses high selectivity owing to the specific catalytic activity of I–, and it is successfully applied for detection of real water samples, showing satisfactory recovery rates. Our study opens up a single O2 microbubble analytical platform with a high spatial resolution because of the small size of the microbubble, which holds great promise in chemical and environmental applications.
研究领域:
分析化学
·
环境科学
·
核化学
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Zhihui Zhang,Kerui Li,Yaogang Li,Qinghong Zhang,Hongzhi Wang,Chengyi Hou
In recent years, wearable devices have been widely used for human health monitoring. Such monitoring predominantly relies on the principles of optics and electronics. However, electronic detection is susceptible to electromagnetic interference, and traditional optical fiber detection is limited in functionality and unable to simultaneously detect both physical and chemical signals. Hence, a wearable, embedded asymmetric color-blocked optical fiber sensor based on a hydrogel has been developed. Its sensing principle is grounded in the total internal reflection within the optical fiber. The method for posture sensing involves changes in the light path due to fiber bending with color blocks providing wavelength-selective modulation by absorption changes. Sweat pH sensing is facilitated by variations in fluorescence intensity triggered by sweat-induced conformational changes in Rhodamine B. With just one fiber, it achieves both physical and chemical signal detection. Fabricated using a molding technique, this fiber boasts excellent biocompatibility and can accurately discern single and multiple bending points, with a recognition range of 0–90° for a single segment, a detection limit of 0.02 mm–1 and a sweat pH sensing linear regression R2 of 0.993, alongside great light propagation properties (−0.6 dB·cm–1). With its extensive capabilities, it holds promise for applications in medical monitoring.
研究领域:
生物医学工程
·
光学传感
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Kaixuan Lyu,Yuehua Zhao,Miaomiao Zhang,Jilin Tang,Jidong Zhang,Yanlong Liu,Xinchao Bian,Xuesi Chen,Hongbo Chen,Dapeng Wang
Poly(l-lactic acid) (PLLA) has been extensively utilized as a biomaterial for various biomedical applications. The first and one of the most critical steps upon contact with biological fluids is the adsorption of proteins on the material’s surface. Understanding the behavior of protein adsorption is vital for guiding the synthesis and preparation of PLLA for biomedical purposes. In this study, total internal reflection fluorescence microscopy was employed to investigate the adsorption of human serum albumin (HSA) on PLLA films with different molar masses. We found that molar mass affects HSA adsorption in such a way that it affects only the adsorption rate constants, but not the desorption rate constants. Additionally, we observed that HSA adsorption is spatially heterogeneous and exhibits many strong binding sites regardless of the molar mass of the PLLA films. We found that the free volume of PLLA plays a crucial role in determining its water uptake capacity and surface hydration, consequently impacting the adsorption of HSA.
研究领域:
生物材料学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Hongqi Chen,Wanying Xia,Qian Gao,Lun Wang
Bisulfite (HSO 3 − ), serves as an important additive in food industry, is one of the most widely distributed environmental pollutants . Herein, a fast and efficient quantitative image analysis method for the determination of HSO 3 − has been developed. The method builds a luminescence energy transfer (LET) system utilized upconversion nanoparticles (UCNPs) as an energy donor and cyanine dye molecules as an energy acceptor. The upconversion luminescence is quenched a lot on the addition of dye molecules and gets recovered well with the addition of HSO 3 − . All the phenomena can be recorded via traditional luminescence spectrometer and near-infrared upconversion luminescence total internal reflection platform. The quantitative image analysis performed on the near-infrared upconversion luminescence total internal reflection platform can significantly reduce sample consumption (10 μL) as well as make a quick and efficient analysis (0.1 s) with a large amout of data become easy. Meanwhile, it shows a wider linear range (1–120 μM), lower detection limit (0.070 μM) and higher detection speed than that of the classical luminescence spectrometer.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Fanfan Zhang,Haichang Yang,Xiahui Gui,Han Guo,Yijun Cao,Yaowen Xing
To develop interfacial nanobubbles (INBs) into application fields, it is of great significance to understand the properties of INBs and their effect on the interaction of inter-particles. In this paper, the morphology of INBs on different hydrophobic surfaces was researched by total internal reflection fluorescence microscopy (TIRF) and atomic force microscope (AFM). A hydrophobic AFM colloid cantilever was used to measure the interaction of inter-particles in the absence and presence of INBs. The results confirm that the formation of INBs is closely related to the hydrophobicity of substrates, more large INBs form on the strong hydrophobic surface (SS). Furthermore, the magnitude and range of the hydrophobic interaction force are positive related to the dimension of INBs. Besides, multiple approaches of hydrophobic colloid to SS, the hydrophobic interaction is further enhanced due to the merging and cavitation of INBs. Therefore, the results presented here provide the relationship between INBs formation and surface hydrophobicity , as well as the effect of INBs on particles interaction. The formation of INBs should be responsible for the hydrophobic interaction of inter-particles, which is a basic insight into the hydrophobic interaction between particles.
研究领域:
物理化学
·
表面科学
·
胶体科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）