Title: Looking at fibres Aim: To investigate natural and synthetic fibres under the microscope. Hypothesis: I predict that natural fibres will appear rough and taper under the microscope and synthetic fibres will appear smooth. Method: Refer to text book 1‚ 2-2 fibres and fabrics. Results: Fabric sample to touch Description/observation 1. Silk Soft 2. Leather Soft 3. Corduroy Soft‚ rough underside 4. Nylon Soft‚ stretchy 5. Linen Soft 6. Wool Soft‚ rough‚ fluffy 7. Polyester
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Major changes came to the textile industry during the 20th century‚ with continuing technological innovations in machinery‚ synthetic fibre‚ logistics‚ and globalization of the business. The business model that had dominated the industry for centuries was to change radically. Cotton and wool producers were not the only source for fibres‚ as chemical companies created new synthetic fibres that had superior qualities for many uses‚ such as rayon‚ invented in 1910‚ and DuPont’s nylon‚ invented in 1935
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1. The physical science unit applies principles and techniques of chemistry‚ physics‚ and geology to the identification and comparison of crime scene evidence. 2. The wide variation in which services are offered in different crime laboratories is due to variations in local laws and budgetary and staffing limitations only. 3. The tendency of the public to believe that every crime scene will yield forensic science evidence and their unrealistic expectations that a prosecutor’s case should always
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Attempt to produce man-made fibre was first started with Artificial Silk’ at 1855 in England by Swiss chemist named Audemars. The fibrous inner bark of mulberry tree was then chemically modified to produce cellulose. At 1880s‚ sir Joseph Swan an English chemist experimented by forcing the cellulose liquid through fine holes into a coagulating bath. First commercial production of artificial fibre was achieved by French chemist Count Hilaire de chardonnet at 1889 in France. At that time he produced
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Lyocell Lyocell is a newly manufactured cellulose fibre which is used in a wide range of clothing and household textiles due to its very unique properties. These properties include: strong‚ long lasting‚ variety of textures (including silky and denim feel)‚ absorbent and wicks moisture. In addition it is very durable‚ so it can be used in conveyor belts‚ oil filters‚ and capacitor separators. Lyocell is made by dissolving wood pulp into amine oxide solvent which changes chemical and surface properties
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Understand Your Fats and Fiber SCI/241 August 16‚ 2012 Cindy Portman I am going to discuss what I understand about fats and fiber. Yes‚ your body needs fats. Dietary fats are essential to give your body energy and to support cell growth it will help protect your organs and help keep your body warm. It helps your body absorb some nutrients and produce
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Understand Your Fats and Fiber Jennifer Taylor SCI/241 December 6‚ 2012 Jeff Mundt Understand Your Fats and Fiber Bad fats are saturated and trans fats. Saturated fats are mostly in meats‚ dairy products and tropical oils. Saturated fat raises both bad cholesterol and good cholesterol‚ while trans-fat only raises bad cholesterol. This makes trans fats technically worse than saturated fats. The better fats would be monounsaturated and polyunsaturated. Monounsaturated will lower your cholesterol
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Understand Your Fats and Fibers Name here teacher SCI/241 Date here Understand Your Fats and Fibers According to “Face the Fats” (2013)‚ the unhealthy fats are‚ saturated and trans fats‚ tend to be more solid at room temperature (like a stick of butter). The healthy fats are monounsaturated and polyunsaturated fats and they tend to be more liquid (like liquid vegetable oil). Saturated fat is found mostly in foods from animals and some plants. Polyunsaturated and monounsaturated fats are
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Introduction Spectrophotometer is an optical instrument that measures and shows how much light energy is transmitted by a substance in solution at different wavelengths of radiant energy. Light passes into a monochromator where only a very narrow range of wavelengths can pass through. From there‚ light is transmitted through a sample solution‚ and on to a phototube where the light energy is converted to an electric current that is registered on a meter. To measure the amount of light absorbed
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Perkin-Elmer polarimeters. PerkinElmer polarimeters employ an optical null principle with automatic analyzer adjustment. An optically active sample generates an electrical signal which in turn drives a motor linked to the analyzer of the instrument via a precision gear train. This signal rotates the analyzer by exactly the angle by which the sample has rotated the plane of polarization of the optical beam. During analyzer adjustment‚ an optical encoder connected to the analyzer drive system directly monitors
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