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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Flow cell for high throughput Raman spectroscopy of non-transparent solutions.

Filippo Zorzi1,2, Emil Alstrup Jensen3,4, Murat Serhatlioglu4

  • 1Center for Nano Science and Technology, Istituto Italiano di Tecnologia, Via Rubattino, 20134, Milan, Italy. luigino.criante@iit.it.

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This study presents a novel microfluidic Raman spectroscopy setup for analyzing flowing fluids, improving measurement efficiency and enabling real-time monitoring of fluid interactions for advanced sensor development.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Microfluidics

Background:

  • Traditional Raman analysis of flowing fluids often uses fused silica capillaries, which can lead to sample photodegradation and limit measurement efficiency.
  • High-throughput analysis is crucial for developing sensitive sensors for fluid composition.
  • Controlling sample flow and position is key for accurate and efficient spectroscopic measurements.

Purpose of the Study:

  • To develop a high-throughput Raman analysis setup for both transparent and non-transparent flowing fluids.
  • To enhance measurement efficiency and reduce sample photodegradation compared to existing methods.
  • To enable simultaneous analysis of multiple fluid streams and real-time monitoring of fluid dynamics.

Main Methods:

  • Utilized a microfluidic cell with a 3-dimensional hydrodynamic focusing system to precisely control fluid flow.
  • Integrated an external optical setup for sample excitation and detection.
  • Developed a modified microfluidic cell capable of laminating two distinct fluid streams in parallel for simultaneous analysis.

Main Results:

  • The setup successfully performed Raman analysis on various flowing fluids, demonstrating versatility.
  • Hydrodynamic focusing effectively controlled sample position and dimensions, reducing photodegradation and increasing throughput.
  • Parallel fluid lamination and line excitation allowed simultaneous analysis of two samples without moving parts, further boosting system efficiency.

Conclusions:

  • The developed microfluidic Raman spectroscopy setup offers a significant advancement in high-throughput fluid analysis.
  • This approach enhances measurement efficiency and reduces sample degradation, paving the way for more sensitive fluid composition sensors.
  • The ability to perform real-time monitoring of mixing and reactions opens new possibilities for studying fluid dynamics.