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Visual detection of mercury ions

A technology of heavy metal ions and quantum clusters, applied in measuring devices, analysis using chemical indicators, nanotechnology for materials and surface science, etc., can solve the problems of not having a unique shape, finding and distinguishing particles, etc.

Inactive Publication Date: 2015-02-04
印度马德拉斯理工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single particle sensors employed to date have had disadvantages due to the difficulty of locating and distinguishing such particles from other impurities in the system (as they may not have a unique shape)
The limits of this detection system do not extend beyond the femtomolar regime

Method used

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  • Visual detection of mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Synthesis of Au / oligoaniline nanoparticles

[0030] Citric acid (25 mg) was dissolved in 35 mL of distilled water and maintained at 80°C. To this solution was added 1 mL of 25 mmol / L HAuCl 4 . After the color changed from light yellow to pink, add 100 µL of distilled aniline followed by 500 µL of 25 mmol / L HAuCl 4 , and continue heating for another 5 minutes. The mixture was cooled to room temperature. The mixture was maintained at room temperature for 5 hours and then centrifuged at 4000 rpm. The light pink supernatant containing Au / oligoaniline nanoparticles was collected and used for further reactions. Au / oligoaniline nanoparticles are raspberry-like aggregates of small nanoparticles (~3 nm in diameter), forming 75-100 nm structures, which are embedded in an oligoaniline matrix.

Embodiment 2

[0031] Example 2: Synthesis of silica-coated gold mesoflowers

[0032] Add 335 μL of HAuCl sequentially to 20 mL of CTAB solution (100 mM) in a beaker 4 (25mM), 125μL of AgNO 3 (10mM) and 135μL of ascorbic acid (100mM). To this solution was added 2 mL of Au / oligoaniline nanoparticles from Example 1, and the mixture was maintained at 80° C. for 1 hour. It was then cooled to room temperature, and the mixture was centrifuged at 3500 rpm for 4 minutes. The residue of Mesoflower aureus was washed three times with water to remove excess CTAB and other unwanted materials. Disperse Aurora mesophila in isopropanol (2 mg in 10 mL). A solution of tetraethylorthosilicate TEOS (120 μL) and ammonia (1.5 mL) was added with rapid stirring. The mixture was centrifuged and the supernatant was removed in order to prevent self-nucleation of the silica particles. The residue was cleaned several times by centrifugation and redispersed in water / isopropanol. This produces a homogeneous coating...

Embodiment 3

[0033] Example 3: Ag bound in bovine serum albumin 15 Synthesis of Quantum Clusters

[0034] To bovine serum albumin powder (250 mg in 5 mL) in distilled water was added silver nitrate solution (5 mL, 10 mM) with vigorous stirring at room temperature. Add about 0.3 mL of NaOH (1M) followed by 10 mM NaBH dropwise 4 solution until the solution changes from colorless to reddish-brown (approximately 120 μL); indicating the formation of Ag bound in bovine serum albumin 15 quantum clusters.

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Abstract

Composite materials comprising a mesoflower structure, methods of preparing the composite material, and methods of detecting heavy metal ion using the composite material are described herein. In some embodiments, a silica-coated gold mesoflower with a layer of silver quantum clusters may be capable of detecting Hg2+ ions in a sample at zeptomolar concentrations.

Description

Background technique [0001] Heavy metal ions have many adverse health effects due to their ecotoxic, carcinogenic and non-biodegradable properties. Heavy metal detection using nanoparticle-based sensors is usually based on monitoring changes in properties of nanoparticles upon binding to analytes, such as surface plasmon resonance (SPR) absorption, fluorescence, interactions between nanoparticles (aggregation process induced by ion chelation), etc. The change. These changes can be detected with absorption and fluorescence spectroscopy; however, they typically require relatively large sensors and analyte concentrations, and may have anomalies due to population averaging. Integrating chemical sensors into single particle sensing devices would be an ideal prospect as it increases the sensitivity of detection. Single particle sensors employed to date have disadvantages due to the difficulty of finding and distinguishing such particles from other impurities in the system, since t...

Claims

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Application Information

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IPC IPC(8): G01N31/22
CPCG01N2021/7786G01N21/643B82Y30/00G01N21/6447
Inventor 普拉德普·塔拉皮尔A·马修潘尼卡瓦拉皮·拉温德拉纳坦·萨詹拉尔
Owner 印度马德拉斯理工学院
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