Water Absorbance
Water Absorbance - Related Videos
07:51
Gas Absorber
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Gas absorbers are used to remove contaminants from gas streams. Multiple designs are used to accomplish this objective1. A packed bed column uses gas and liquid streams running counter to each other in a column packed with loose packing materials, such as ceramics, metals, and plastics, or structured packing1. The packed bed uses surface area created by the packing to...
13:44
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Cited by 6 •
2012
This protocol outlines the simulation, fabrication and characterization of THz metamaterial absorbers. Such absorbers, when coupled with an appropriate sensor, have applications in THz imaging and spectroscopy.
13:37
Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Cited by 1 •
2013
Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.
07:15
Transient Optical Clearing Using Absorbing Molecules for Ex Vivo and In Vivo Imaging
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Cited by 1 •
2025
Optical clearing techniques, such as absorbing molecules solutions, reduce light scattering temporarily to enhance biological imaging and offer biocompatible, reversible in vivo imaging strategies for deeply embedded organs. This protocol presents detailed experimental procedures as well as advanced image processing to achieve high-quality, dynamic imaging for real-time dynamics in living animals.
01:23
States of Water
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2019
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart. Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
FAQs
Water molecules absorb photons only when the photon energy matches specific vibrational or electronic transitions. Consequently, the measured attenuation changes with wavelength rather than remaining uniform across the spectrum. Selecting an appropriate wavelength allows an engineering measurement to emphasize changes in optical transmission or reveal dissolved constituents associated with altered water chemistry.
The Beer-Lambert relationship connects absorbance with the ratio of incident intensity, I0, to transmitted intensity, I, through A = -log10(I/I0). This logarithmic form converts a reduction in detected light into a quantitative value. Engineers can therefore compare optical measurements consistently when assessing sample composition, transmission, or changes in water chemistry.
Transmitted intensity describes how much light remains after passing through the water, whereas absorbance expresses the attenuation on a logarithmic scale. A lower intensity produces a higher absorbance value under the stated relationship. Using absorbance makes optical changes easier to quantify and compare across measurements used for analysis, monitoring, and sensor calibration.
A measurement begins by directing light through the water sample at a selected wavelength and determining the transmitted intensity. That value is compared with the incident intensity, then converted to absorbance using A = -log10(I/I0). Repeating this approach at relevant wavelengths provides optical transmission information that can support composition assessment or instrument calibration.
The measurement is useful when engineers need to track dissolved constituents or detect changes in water chemistry through their optical effects. Water-quality monitoring can use changing absorbance as an indicator of altered sample composition, while process control can use the same information to follow conditions during operation. Chemical analysis provides another application for interpreting these changes.
Water can reduce the strength of an optical signal and can also influence heating within a system. These effects may limit transmission, alter measurement accuracy, or affect how sensors and other optical components are calibrated. Accounting for absorbance during design helps engineers select suitable operating wavelengths and anticipate how water will influence system performance.