Persistent organic pollutants (POPs) have been a public health and environmental concern for many years given their persistence in the environment, tendency to bioaccumulate, and toxic, carcinogenic, and endocrine-disrupting potentials (Bonefeld-Jorgensen 2014). Perfluoroalkyl Chemicals (PFCs) is one such family, chemically characterised by a fluorinated linear carbon chain with a hydrophilic head (Volkel 2008). Due to its stability, amphiphilicity, and non-flammability (Lau 2007, Kotthoff 2015), PFCs are commonly used to aid the industrial production of textiles, food packages, and cookware (Kotthoff 2015, Humblet 2014). PFCs can remain in the environment and bioconcentrate in animals (Lau 2007).
The name copper and the symbol Cu derive from the Latin word “Cuprum”, which by definition means the island of Cyprus. Copper is the 29th element and is located amongst the transition metals in the periodic table. Copper is one of the first elements both known and to be utilized
Location of Titanium on the Periodic Table: http://bit.ly/1TiYE0o Discovery of Titanium Titanium was first discovered by a Reverend with the name of William Gregor in the United Kingdom (he was an English pastor at the time) in 1791. Except, it wasn't until 1910 when a man by the name of Matthew A. Hunter an American metallurgist was the first to have produced pure Titanium. A plaque was later made
He was working at DuPont Jackson Laboratory in New Jersey and had been trying to invent a new type of Freon for cooling purposes. Roy Plunkett had no idea that he would come across “a material that would eventually become an indispensable part of everything from space capsules to heart valves to frying pans--and one that had absolutely nothing to do with refrigeration” (Friedel, 1996). To test out his hypothesis, he first needed to obtain large quantities of TFE. After Plunkett made a hundred pounds of TFE he placed the “canisters on top of dry ice so that the TFE inside would liquefy and the pressure inside the cans would be kept low” (Friedel,
" One sometimes finds what one is not looking for" Sir Alexander Fleming (1997). Some of the most popular inventions were not planned or expected. You never know when an invention could pop out at you. In this essay you will learn that discovery and innovations are not just created
The platinum name comes from a spanish term platina, which means “little silver.” platinum was also given the name “unmeltable metal” in 1735. The atomic number is 78, and its mass is 195.084 u. platinum has 78 protons, 117 neutrons, and 78 electrons. Platinum has two valence electron. Platinum is a very unreactive metal and isn't affected by common acids. Platinum has an unique property, it can absorb large quantities of hydrogen gas. Platinum can dissolve in aqua regia, which is a mixture of nitric acid and hydrochloric acid. Platinum is in the Transition Metals family. Platinums physical properties are , soft, heavy, shiny, and malleable. Platinum is known as a “noble metal” because it is very resistant to tarnishing and corrosion. Platinums melting point is 1768.3 degrees celsius, and 3214.9 degrees fahrenheit. Platinums boiling point is 3825 degrees celsius, and 6917 degrees fahrenheit. Platinum has a special physical property, which can withstand high heat and electrical
The purpose of this lab was to test four different polymer coupons under a tensile load and determine mechanical properties. This was done under normal circumstances along with the samples soaking in different temperature water baths before being tested. It was found that Nylon 6 was the most brittle sample and that High Impact Polystyrene was the most elastic. It was also found that there is a general trend of materials getting more brittle when colder and more elastic when warmer.
The name fluorine, comes from the Latin word “fluere” which means to flow. This toxic, pale yellow, corrosive gas is in row 2, group 17; making it the lightest gas in the halogen chemical family. Fluorine is a non-metal element with the atomic mass of 19 and atomic number of 9 respectively. It has a boiling point of -188 degrees Celsius, a melting point of -219 degrees Celsius and a density of 0.0017g/cm3. When fluorine exists in it’s liquid form, it is freely soluble in liquid oxygen and ozone. Fluorine has
Polybutylene pipe has a good dimensional stability polybutylene can operate at temperature up to 100oC without getting soft or distort; polybutylene does not degrade over time. When it comes to reacting with steel components for example radiator. Copper and brass reacts and corrode. The stress retention of polybutylene is better than that of copper, making the pipes stronger when their pressed and it is chemically inert. This does not contaminate the drinking water. The pipe made from polybutylene can be used for mechanical fittings which contains seals and stainless steel locks washers because it has a good dimensional
Birds are more reactive to carbonyl fluoride (COF2), and hydrogen fluoride (HF). These gases can cause cancer in the animals. Besides, they can make birds dead immediately if the birds fly near to the Teflon that has heat over 680 degree Fahrenheit. The reason the birds died are the lungs of the birds have the blood vessel ruptured and fill with blood. This leading the birds do not have enough oxygen to breath. Moreover, Teflon releases a gas name monofluoroacetic acid and it makes people sick because this gas when they go into the body's system, it can cause nausea, chills, fever, and headache. These symptoms will stay in the body for a few days and it called polymer fume fever. Furthermore, hydrogen fluoride can harmful to the tissue in
Perfluorocarbons (PFCs) are lab made chemical compounds that are linear and cyclic hydrocarbons who have a low molecular weight. Liquid Perfluorocarbons are formed when hydrogen ions in hydrocarbons have been replaced with fluorine atoms since they are neutral chemical compounds (Veni et al. 39). Perfluorocarbons are also chemically inert—not chemically
Polyethylene terephthalate fibers (PET-Fs) were coated with microporous organic networks (MONs) by the Sonogashra coupling of tetra(4-ethynylphenyl)methane with 1,4-diiodobenzene. Ni was deposited on the resulting PET-F@MON via electroless deposition. Interestingly, while Ni on the PET-Fs showed a sharp decrease in conductivity in repeated bending test, the PET-F@MON@Ni showed excellent retention of conductivity. We suggest that thin MON layers play roles of an efficient binder for Ni attachment to the fibers and a structural buffer for the relaxation of bending strain. The positive effect of MON was supported by the scanning electron microscopy studies of the PET-F@Ni or PET-F@MON@Ni retrieved after 2000 bending numbers. While Ni on the
KEYWORDS: polythene, pyrolysis, catalytic cracking, Zeolite, grease. I.INTRODUCTION Pollution due to waste plastic has been a very largeissue in countries like India and China in the Asian region. India generates 5.6 million tones of plastic waste annually. In this large plastic waste there is a large share of the metro cities .