(Diş Hekimliği) 1. Zamk gibi. 2. Tiroid bezinin jelatin gibi, renksiz salgısı, 3. Bir başka maddenin dispersiyon ortamında bir maddenin partiküllerinin eşit aralıklarla dağıldığı, maddenin bir hali
Small particles which have a negligible settling velocity These particles have a very small mass so gravitational force is low compared to surface frictional forces Typical colloidal sizes range from 10-3 mm to 1 mm
These are the finest particles in the soil The surfaces of colloids attract base ions, which plants use as nutrients
Very small, finely divided solids (particles that do not dissolve) that remain dispersed in a liquid for a long time due to their small size and electrical charge
Very small, less than 1 ðmm, finely divided solids (that do not dissolve) that remain dispersed in a liquid for a long time due to their small size and electrical charge
Finely divided solids which will not settle out by gravity alone but which may be removed by coagulation or biochemical action
Very small particles with at least one dimension within the range 10 nanometers to 1 micrometer, and are stabilized in solution by chemical or electrochemical means
Very small, finely divided solids (that do not dissolve) that remain dispersed in a liquid for a long time due to their small size and electrical charge
Very finely divided solid particles which will not settle out of a solution; intermediate between a true dissolved particle and a suspended solid which will settle out of solution The removal of colloidal particles usually requires coagulation to form larger particles which may be removed by sedimentation and/or filtration
A gelatinous substance-in-solution Beer is considered a colloid, as is gelatin Many reactions in beer involve the colloidal state, especially those affecting haze and head stability
a solid, liquid, or gaseous substance made up of very small, insoluble, nondiffusible particles (as single large molecules or masses of smaller molecules) that remain in suspension in a surrounding solid, liquid, or gaseous medium of different matter a state of matter consisting of such a substance dispersed in a surrounding medium All living matter contains colloidal material, and a colloid has only a negligible effect on the freezing point, boiling point, or vapor pressure of the surrounding medium [< Greek kolla, glue + -oid; coined by T Graham (1805-69), Scottish chemist]
An intimate mixture of two substances one of which, called the dispersed phase (or colloid), is uniformly distributed in a finely divided state throughout the second substance, called the dispersion medium (or dispersing medium). The dispersion medium may be a gas, a liquid, or a solid, and the dispersed phase may also be any of these, with the exception that one does not speak of a colloidal system of one gas in another. A system of liquid or solid particles colloidally dispersed in a gas is called an aerosol. A system of solid substances or water-insoluble liquids colloidally dispersed in liquid water is called a hydrosol
Small particles in the size range of 10-9 to 10-6 meters that are suspended in a solvent Naturally occurring colloids in groundwater arise from clay minerals
Colloidal particles are so small and light that they do not settle in water The movement of water molecules is enough to keep them in suspension It is important to remember that colloidal particles occur in a suspension, not a solution A simple way to tell the difference is to shine a beam of light through the liquid If you can see the beam it is a suspension
Usually refers to the state of subdivision of dispersed particles; intermediate between very small particles in true solution and large particles in suspension Proteins and pectins are usually colloidal
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
State of subdivision of matter which comprises either single large molecules or aggregations of smaller molecules in a dissimilar vehicle, usually held separate (prevented from peptization) by molecular potential or chemical additives
water-soluble, non-crystalline substances such as gelatin, glue, or albumen, of very fine granule size, used as vehicles in photomechanical sensitizers in screen printing and made light-sensitive by the addition of a bichromate
Most frequently a special type of liquid mixture or suspension in which the particles of suspended liquid or solid are present in a very finely divided form (i e , particle size from about 1 to 500 millimicrons in diameter) The colloidal suspension of liquids in liquids is an emulsion *7 6/30/98
Particles suspended in a liquid, which are larger than molecular size but small enough to be moved about by molecular collisions These particles do not settle under gravity Their surface area is very large per gram, and the particles have a charge due to ions sorbed on the surface This charge prevents coagulation or clumping of the particles and therefore, coagulation can be brought about by neutralizing the charge
Substance consisting of particles that, although too tiny to be seen with the unaided eye (typically 1 nanometre to 10 micrometres), are substantially larger than atoms and ordinary molecules and that are dispersed in a continuous phase. Both the dispersed phase and the continuous phase may be solid, liquid, or gas; examples include suspensions, aerosols, smokes, emulsions, gels, sols, pastes, and foams. Colloids are often classified as reversible or irreversible, depending on whether their components can be separated. Dyes, detergents, polymers, proteins, and many other important substances exhibit colloidal behaviour
A suspension of sub-light-microscopic particles This definition arbitrarily limits the size of the particles to 0 1 - 0 005mm Such particles may be studied by dark field illumination, particularly with the light ultramicroscope or by means of an electron microscope
A particle, which may be a molecular aggregate, with a diameter of 0 1 to 0 001 µm Soil clays and soil organic matter are often called soil colloids because they have particle sizes that are within, or approach colloidal dimensions