Photochemistry Articles
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Air Pollution Part 2 – Sources of Gaseous Substances
Air pollutants are effectively either specific gas-phase molecules or small solid-phase particles suspended in the air. The latter are as a collective referred to as particulates. Let’s take a closer look at the origins of gaseous pollutants. Many anthropogenic activities give rise to gaseous air pollutants, but there are also a few natural sources. Stationary and Mobile Combustion ...
By OPSIS AB
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The U.S. National Ambient Air Quality Standards
Air quality guidelines and standards have an important role to play in the management of air quality. Such standards are generally established and enforced by regulatory agencies in national governments. It is generally accepted that an air quality standard is a description of a level of air quality or air pollution, which is adopted by a regulatory authority as enforceable. The US Clean Air ...
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Spring is in the Air
The types of air pollution and the levels vary widely between urban and rural environments, between small communities and densely populated cities, and between different regions. However, there are also effects owing to the seasonal variations during the year.The first seasons-related thing happening early spring can very well be short periods of high levels of particulates in the air. This owes ...
By OPSIS AB
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Chilling Discovery: Cold Weather Algae Blooms Uncovered
If you’ve read any of our blogs, you already know the plethora of negative impacts of harmful algal blooms (HABs). From depleted oxygen levels to fish kills, and from skin irritations to liver damage, the consequences of these blooms are well-documented. But when we think of harmful algal blooms (HABs), we typically imagine warm weather and stagnant water, with greenish-blue scum covering ...
By LG Sonic
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Electrochemical NO2 gas sensor in NOx pollution control
Background: Nitrogen dioxide gas concentration can be measured by electrochemical NO2 gas sensor. On the one hand, under certain conditions, nitrogen dioxide can combine with hydrocarbons in the air to form photochemical smog. Damage the air quality of the atmosphere environment, seriously harm people’s health, so that people rely on the air environment is polluted. Sulfur oxides and ...
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Smog, Cough, Mask: What Can FPI Provide for the Deteriorating Air Quality
It is an observable fact that many places are still exposed to poor air quality, which has claimed people’s health and damaged the sensitive ecosystem. Therefore, many countries have rolled out their goals for air quality management with a common wish to improve the living standard for more. As the world’s leading advanced equipment provider, and a producer of air quality management ...
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Fluorescence Spectroscopy Book List
It’s always a pleasure when we get the opportunity to talk to the next generation of new scientists. We enjoy meeting them at exhibitions, events and working with undergraduate and graduate students within the fields of photochemical and photophysics. As part of our sponsorship of the Scholarship Awards for the Southern University of Science and Technology (SUST) in Shenzen, China we are able to ...
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The Importance of Managing VOCs Emission is Worth Repeating
VOCs, the abbreviation of Volatile Organic Compound, originate from automobiles, industrial production, and civilian use. Studies have shown that long exposure to the components will damage the liver, kidneys, or central nervous system. That is why governments plan to cope with the problem, longing for a solution for this health-threatened issue. As a leading environmental issue solutions ...
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What are VOCs? What’s the harm? How to manage VOCs?
DEFINITION OF VOC VOCs (VOLATILE ORGANIC COMPOUNDS) is the abbreviation of volatile organic compounds. Sometimes it is also called VOC, which refers to a VOC at this time, or a collective concept of volatile organic compounds. Both Chinese volatile organic compounds and English Volatile Organic Compounds are relatively long, so it is customary to use VOCs or VOCs for short. In terms of chemical ...
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What is Transient Absorption Spectroscopy?
Transient absorption (TA) spectroscopy, also known as flash photolysis, is a pump-probe spectroscopic technique utilised to measure the photogenerated excited state absorption energies and associated lifetimes of molecules, materials, and devices. The pump-probe technique can be described by a sample being photo-excited by a light source (pump pulse), whereby a second light source (probe pulse) ...
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Keep an Eye on Ozone
There are no major man-made sources of ground-level (or tropospheric) ozone. Instead, ozone is formed by chemical reactions involving nitrogen oxides (NOX), volatile organic compounds (VOCs), and some other substances in the presence of sunlight. Accordingly, where there are emissions of these so-called ozone precursors, there is also a notable risk of finding elevated ozone concentrations. Heat ...
By OPSIS AB
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Prevent tail gas pollution and reject environmental hazards
Motor vehicle exhaust is the exhaust gas generated during the operation of motor vehicles, including carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC) and solid suspended particles (PM), which is one of the culprits of air pollution. From the perspective of the current pollution situation, the vehicle exhaust emissions to a large extent exceed the self purification capacity of the ...
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Molecular Spectroscopy Solutions for Research and Development
What is Molecular Spectroscopy?Molecular Spectroscopy is a subcategory of spectroscopy that studies the interaction of radiation with molecules and extended materials, as opposed to atomic spectroscopy techniques which deal with individual atoms. Samples that absorb (UV-vis spectroscopy), emit (Photoluminescence spectroscopy), or in elastically scatter (Raman spectroscopy) radiation may be ...
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How Oxygen Sensing Technology Can Deliver Faster Test Results For Food And Beverage Microbiology
Oculer Ltd, Ballina, Ireland1 and School of Chemistry and Chemical Engineering, Queens University, Belfast, UK2 Why use O2 sensors? O2 sensors are widely used in many areas of biology and they have been applied for monitoring the activity and growth of bacteria in the environment. There are a small number of reports of their use for the specific detection of microbial growth in the laboratory. A ...
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Edinburgh Instruments Spectroscopy Instrumentation Overview
Edinburgh Instruments is a world-leader in both single photon counting and time-correlated single photon counting (TCSPC) based fluorescence Spectroscopy Instrumentation in addition to Raman Spectroscopy Instrumentation.We are recognised internationally as a company that offers maximum flexibility and exceptional quality in both instrumentation and services. We understand that choosing the right ...
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What is Quantum Yield?
The IUPAC definition of quantum yield (Φ) is the number of a certain event occurring per photon absorbed by the system.1However, it is most commonly written specifically for the emission of light (photoluminescence) by a system2-5 This narrower definition is often simply called quantum yield; with the emission of light being implicit given the context. However, the terms fluorescence, ...
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The Most Commonly Seen Organic and Inorganic Photochromic Materials You Should Know
Photochromic materials refer to a class of materials that can change color after being excited by a light source. The first successful commercial application of photochromic materials began in the 1960s. Subsequently, a lot of research was done on its mechanism and application. Later on, color-changing glasses were developed. Photochromic compounds can generally be divided into two types: organic ...
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OLED Inkjet Printing
The OLED inkjet printing uses solvents to melt OLED organic materials and subsequently prints materials on the surface of substrates to form R (red), G (green), and B (blue) organic light-emitting layers. Inkjet Printing Polymer Materials Due to the greater molecular weight of polymers, solution processing was mainly used to form films, such as spin coating or printing, while inkjet printing ...
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AMC Contamination-Caused Optical Haze Formation on Surfaces
In this installation of our lithography-focused blog series, we discuss haze formation in lithography applications, and how to mitigate it by monitoring for AMCs. Go here for our previous blog in this AMC Contamination monitoring ...
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An Experiment Simulating Titan’s Atmosphere, as Probed by a Hiden Mass Spectrometer
In the recent paper “An atmospheric origin for HCN-derived polymers on Titan” by Perrin et al. 2021 published in Processes MDPI, we highlighted that the prebiotic HCN molecule is an effective precursor of Titan’s haze and confirmed the HCN-derived polymer nature of the haze. Titan, the largest moon of Saturn, hosts a thick nitrogen-based atmosphere, where HCN is also ...
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