A Warm Embrace of Comfort and Flavor In classic comfort foods, few dishes evoke the same sense of warmth and satisfaction as French Onion Soup. This timeless culinary creation seamlessly marries simplicity with depth of flavor, making it a cherished favorite for countless individuals worldwide. As you delve into a steaming bowl of this rich and aromatic concoction, you journey through the history, ingredients, and preparation techniques that transform humble onions into a culinary masterpiece. The origins of French Onion Soup can be traced back to ancient times, with onions being a staple in many cultures due to their availability and long shelf life. However, the French elevated this humble vegetable to culinary stardom. The soup's roots are believed to lie in Paris during the 18th century, when the lower classes commonly consumed the dish. Onions, abundant and affordable, were slowly caramelized to improve their natural sweetness and depth of flavor. Over time, the addition o...
An artificial fiber is a thread-like material invented by human scholars. Such fibers do not exist naturally. Certain examples of man-made fibers include nylon, rayon, Dacron ™, and Orlon ™. These terms illustrate that certain man-made fiber names are, or have become, common chemical names nylon and rayon , while other Dacron ™ and Orlon ™ are proprietary name. Proprietary names are names that are own by a company and are properly spelled to indicate that the name is a trademark ™. techgeeksblogger
Types of artificial fibers
Within the artificial textile fibers we can find several
types:
Cellulosic artificial fibers such as rayon where we can
distinguish the following characteristics:
• The raw
material is cellulose
• They have
an enormous mechanical resistance when dry
Protein artificial fibers . Its manufacture consists of the
spinning of dough achieved by dissolving proteins. We can distinguish several
classes:
• Fibrolana
or lanitel: it is manufactured from the casein of milk dissolved in soda
• Picara:
it is obtained from the proteins of corn dissolved in corrosive soda
• Alginate
rayon: it is obtained from the proteins of seaweed dissolved in soda
Composition of arificial fibers
Most man-made fibers are polymer . A polymer is a chemical
substances that is generated when one or two small molecules react with each
other over and over again. The initial molecule used in the manufacture of a
polymer is called monomer. When 2 different monomers are used, the resulting
product is called a copolymer.
One case of a copolymer is nylon, first invented by the
American chemist Wallace Carothers (1890-six-thousand-nine-thirty-seven) in
1928. The 2 monomers that nylon is made of are tough substances called adipic
acid and hexamethylenediamine. For ease, let's call the first monomer A and the
second monomer B. A nylon molecule, then, has a structure something like this:
The hyphens at the start and at the end of the molecule
indicate that the -AB- sequences go on and on until such time as it contains
hundreds or thousands and thousands of monomer units.
The common process by which man-made fibers are generated is
called spinning. When a polymer is first generated, it is generally a thick,
viscous (sticky) liquid. This liquid is forced through a disk that contains
fine holes known as a string. The string can be suspended in the air or it can
be submerged under water. As the polymeric liquid passes through the holes in
the string, it becomes solid, forming long, fine threads.
The properties of an artificial fiber can change in multiple
ways, including the way the polymer is first generated, the additives that can
adhere to the polymer, and the way the polymer is processed through the row.
A scanning electron micrograph of the fibers of a dachronic
polyester material used in sleeping bags. The core of each fibers has up to 7
air cavities that increase its insulation capacity. (Reproduced with permission
from Photo Researchers, Inc.)
A scanning electron micrograph of fibers from a dachronic
polyester material used in sleeping bags. The core of each fibers has up to 7
air cavities that increase its insulation capacity. (Reproduced with permission
from
Other synthetic
fibers Artificial fibers can be manufactured through
processes other than polymerization. Glass fibers, for example, can be generated
by melting certain glass fabrics and then forcing the melted material through a
row to form long, thin strands. Many of these non-polymer man-made fibers are
the result of recent chemical research and show exciting promise for new
applications in industry.