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Topic: Colloid


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  cen-chemjobs: Job Seeker - Colloid and Surface Science
A colloid is a state of matter characterized by a large surface area per unit volume or unit mass.
Colloidal systems include solid-solid (metal alloys); solid-liquid (a suspension such as muddy water); solid-gas (smoke, airborne dust, aerosol inhalers); liquid-solid (butter, creams, ointments, lotions, photographic emulsions, paints); liquid-liquid (an emulsion such as milk); liquid-gas (fog, mist, aerosol sprays); gas-solid (marshmallows); and gas-liquid (foams).
Colloid and surface chemistry is involved in every segment and niche of clinical diagnostics and the specialty chemical, petrochemical, pharmaceutical, biopharmaceutical, and cosmetic industries.
pubs.acs.org /chemjobs/jobseeker/articles/job_colloid.html   (1507 words)

  
 Colloid & Interface Science
Colloid and Interface Science is an important area of knowledge which underpins a very wide variety of both fundamental and applied science.
Colloids include a variety of complex materials, eg liquids in liquids (emulsions), solids in liquids (dispersions), liquids in gases (aerosols or foams), solid dispersions and biosystems, where the interactions between phases and at interfaces are dominant aspects of the system’s behaviour.
Colloid and formulation science is a critical capability in industrial design and manufacture of just about any chemical and many bio-industry “finished” products, eg: medicines and biocides; foods; personal care and household care products; ceramics and composites; paints and coatings to name just a few.
www.rsc.org /Membership/Networking/InterestGroups/colloidscience/index.asp   (302 words)

  
  colloid. The Columbia Encyclopedia, Sixth Edition. 2001-05
Colloidal particles are larger than molecules but too small to be observed directly with a microscope; however, their shape and size can be determined by electron microscopy.
When an ultramicroscope (see microscope) is used to examine a colloid, the colloidal particles appear as tiny points of light in constant motion; this motion, called Brownian movement, helps keep the particles in suspension.
Absorption is another characteristic of colloids, since the finely divided colloidal particles have a large surface area exposed.
www.bartleby.com /65/co/colloid.html   (0 words)

  
 What is a Colloid?
Today colloid science is the study of systems involving small particles of one substance suspended in another.
Colloid chemistry is closing the gap between molecular chemistry and solid state properties.
Colloid chemists may use six orders of magnitude of molecular weight exclusively, including all the corresponding effects.
www.mpikg-golm.mpg.de /kc/what_is_a_colloid.html   (494 words)

  
 eMedicine - Colloid Cysts : Article by Lawrence S Chin, MD
Approximately 0.5-1% of all primary brain tumors and 15-20% of all intraventricular masses are colloid cysts.
In 1910, Sjovall hypothesized that colloid cysts were remnants of the paraphysis, an embryonic midline structure within the diencephalic roof immediately rostral to the telencephalic border.
Colloid cysts appear homogenous, with two thirds of them appearing hyperdense to surrounding parenchyma and one third appearing isodense to surrounding parenchyma.
www.emedicine.com /med/topic2906.htm   (2453 words)

  
 eMedicine - Colloid Milium : Article by Susan Cooper, MRCGP, MRCP,MD
Background: Colloid milium is a rare condition characterized by (1) the presence of multiple, dome-shaped, amber- or flesh-colored papules developing on light-exposed skin and (2) the observance of dermal colloid under light microscopy.
The origin of the colloid deposition in the dermis is not certain, but it is thought to be due to degeneration of elastic fibers in the adult form and due to degeneration of UV-transformed keratinocytes in the juvenile form.
In the classic adult form, the colloid is located in the upper and mid dermis and in defined islands, with a very superficial, subepidermal layer of the papillary dermis usually being spared (Grenz zone).
www.emedicine.com /derm/topic80.htm   (1454 words)

  
 COLLOID - Definition
{Collodion}.] Resembling glue or jelly; characterized by a jellylike appearance; gelatinous; as, colloid tumors.
Chem.) A substance (as albumin, gum, gelatin, etc.) which is of a gelatinous rather than a crystalline nature, and which diffuses itself through animal membranes or vegetable parchment more slowly than crystalloids do; -- opposed to crystalloid.
{Styptic colloid} (Med.), a preparation of astringent and antiseptic substances with some colloid material, as collodion, for ready use.
www.hyperdictionary.com /dictionary/colloid   (144 words)

  
 Colloidal Dynamics: Leaders in Colloid Measurement
Colloidal Dynamics develops and markets instruments that measure the particle size and zeta potential of concentrated colloids and the pore size distribution in powders.
Our instruments are used for controlling the properties of a large range of industrial and scientific materials from ceramics and inks to semiconductor wafers and fuel cell electrodes.
Colloidal Dynamics has the experience and tools available for characterising the concentrated and complex colloids encountered in industry, and the most solid theoretical backing for these measurements.
www.colloidal-dynamics.com   (111 words)

  
 American Colloid Company
American Colloid Company is one of the world’s leading producers of bentonite clay.
With mining operations throughout North America and a sister subsidiary with mining operations throughout the world, American Colloid’s trademark Additrol line is an industry standard in the metalcasting industry.
American Colloid’s Premium Gel is ideal for multiple applications in oil well drilling.
www.colloid.com   (127 words)

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