Related Experiment Video
Updated: Jul 10, 2026
09:53
Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
Published on: October 30, 2012
[A high transmittance material in UVc band]
Wen-bo Lü1, Qiang Xu, Wei-min Du
1School of Physics, Peking University, Beijing 100871, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 10, 2003
Summary
This study reveals an organic material with high UV-C transmittance and a deep absorption cutoff around 290 nm. Its spectral properties can be tuned by pH, enabling high-quality UV-filter production.
Area of Science:
- Materials Science
- Spectroscopy
- Organic Chemistry
Context:
- Investigating the spectral properties of organic materials is crucial for developing advanced optical filters.
- Understanding UV absorption and transmittance is key for applications in light filtering and protection.
Purpose:
- To characterize the spectral behavior of an organic material in acidic solutions.
- To determine the material's suitability for producing ultraviolet (UV) filters.
Summary:
- The organic material exhibits high transmittance at 252 nm (56.5%) and a strong absorption peak at 290 nm (epsilon > 10^4 L·mol⁻¹·cm⁻¹).
- Absorbance in the 280-298 nm range is high (A > 8), indicating very low transmittance (T < 10⁻⁸).
- The transmission peak is tunable between 251-260 nm via pH and solution polarity, with a distinct spectral shift observed in acidic conditions.
Impact:
- The material's distinct UV-C band characteristics, including high transmittance and deep cutoff, make it ideal for UV-filter applications.
- The ability to tune spectral properties offers flexibility in filter design.
- This research facilitates the production of high-quality UV-filters using established manufacturing techniques.
More Related Videos
10:06Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs
Published on: July 2, 2020
07:23Light-induced Patterning and Grafting for Slippery Surfaces based on Silane-coated Nanoporous Structures
Published on: November 14, 2025
Related Concept Videos
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...
01:30UV–Vis Spectrum
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
01:32UV–Vis Spectroscopy of Conjugated Systems
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
One of the factors influencing λmax is the extent of conjugation in the...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
01:14UV–Vis Spectrometers
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
01:29UV–Vis Spectroscopy: Woodward–Fieser Rules
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...