Which suspension is better Flocculated or Deflocculated

Flocculated suspensionDeflocculated suspensionSediment is easy to re-disperse.Sediment is difficult to re-disperse.Sediment is loosely packed and does not form a hard cake.Sediment is tightly packed and forms a hard cake.The supernatant is clear.The supernatant is hazy.

Which suspension is best flocculated or Deflocculated?

Why is flocculation necessary for suspension?

Since the particles are linked together only loosely, they will not cake and may be easily redispersed by shaking the suspension. … As we can see from Stoke’s Law, if we apply flocculation as a means of preventing caking, then we will increase the particle diameter, and thus increase the rate of sedimentation.

What is the difference between flocculated and deflocculated suspensions?

The key difference between flocculation and deflocculation is that flocculation is the formation of flocs by the clumping of fine particles, whereas deflocculation is the dispersion of flocs to form a stable colloid. Flocculation refers to the formation of clumps from fine particles in a colloid.

What is suspension Floccules?

Particles in suspension can come together to form either floccules or aggregates. Floccules form when weak van der Walls forces are holding the particles together. Foccules are easy to break apart.

Why rate of sedimentation is high in flocculated suspension?

increase in sedimentation rate due to increase in size of sedimenting particles. ➢ Hence, flocculated suspensions sediment more rapidly. ➢Here, the sedimentation depends not only on the size of the flocs but also on the porosity of flocs.

How flocculated and Deflocculated suspension are prepared?

Electrolyte and ionic surfactant can be used as flocculating agents to produce a flocculated suspension. suspension prepared without flocculating agent is a deflocculated one. The physical stability of the suspension is assist by determining the sedimentation volume or degree of flocculation.

What is the difference between suspension and emulsion?

An emulsion is similar to a suspension only in that it is a mixture of two components. … Unlike a suspension, which can consist of two components of any phase, an emulsion is a mixture of two liquids.

What is meaning of flocculated?

verb (used with object), floc·cu·lat·ed, floc·cu·lat·ing. to form into flocculent masses. … to form flocculent masses, as a cloud or a chemical precipitate; form aggregated or compound masses of particles.

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What happens in a flocculated suspension?

Flocculation, in the field of chemistry, is a process by which colloidal particles come out of suspension to sediment under the form of floc or flake, either spontaneously or due to the addition of a clarifying agent.

Why Pharmaceutical suspension does not follow Stoke's law?

Stokes’ law is based upon several assumptions, which may not always hold true for pharmaceutical suspensions. … In a concentrated suspension, this interference may occur and may hinder the settling results. Particle shape and size are also important in Stokes’ equation.

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What is Stoke's law and how does it relate to pharmaceutical suspensions?

According to Stokes’ law, the velocity of a suspended particle falling under gravity is directly proportional to the particle’s size. Reducing the size of suspended drug particles therefore reduces the rate and likelihood of sedimentation, helping to maintain the dispersion.

Are suspensions more stable than solutions?

Because of their liquid character, suspensions represent an ideal dosage form for patients who have difficulty swallowing tablets or capsules. … Finally, drugs in suspension are chemically more stable than in solution.

What is flocculated suspension Slideshare?

10.  In flocculated system the individual particle are contact with each other to form loose aggregate & create network like structure.  Rate of sedimentation is high.  Sediment is loosely packed. When shaking it can be redisperse easily & reform the original suspension.

What is ideal suspension?

1 It should settle slowly and should be readily re-dispersed on gentle shaking of the container. 2 The particle size of the suspension remains fairly constant throughout its long period of undisturbed standing . 3 The suspension should pour readily and evenly from its container.

Which type of sedimentation flocculated suspension of high concentration takes place?

In which type of sedimentation, flocculent suspension of high concentration takes place? Explanation: In type IV sedimentation, flocculent suspension of high concentration takes place and particles comes in contact with each other resulting in the formation of structure. 6.

What is settling in suspension?

When suspensions contain medium or coarser particles with density higher than the liquid they tend to settle and accumulate at the bottom of the vessel or pipe. These are called settling suspensions.

What is the rate of sedimentation in flocculated suspension?

The ratio of the sedimentation volume in case of flocculated suspension to the sedimentation volumein case of deflocculated suspension is called. For a flocculated suspension the degree of flocculation is observed to be one. The sedimentationvolume is also 1 (one).

What is difference between coagulation and flocculation?

Coagulation: Particles that aggregate with themselves e.g. by the influence of a change in pH. Flocculation: Particles that aggregate by the use of polymers that binds them together.

How do flocculants work?

A flocculant is a chemical that can be added to the water to help colloids and any other suspended solids bind together and form heavier particles. The heavier particles then settle to the bottom of the container/tank and the water on the top is drained off.

Is flocculation and coagulation the same?

Coagulation is the destabilization of colloidal particles brought about by the addition of a chemical reagent called as coagulant. Flocculation is the agglomeration of destabilized particles into microfloc and after into bulky floccules which can be settled called floc.

What are advantages of emulsion?

Viscosity of polymer emulsion is much lower than that of straight polymer in melt phase. Easier to process but also allows production of polymers that are extremely sticky as 100% polymer. Final product can easily be removed from reactor due to lower viscosity (and can be washed out with water).

What does the term flocculated suspension and non flocculated suspension mean?

The suspension are said to be flocculated ,when the individual particles are in contact with each other and form a network like structure . Whereas in case of non-flocculated suspensions,the individual particles exists as a separate entity. … In Non-flocculated suspensions The rate of sedimentation is slow.

What is the difference between a suspension colloid and emulsion?

Colloid particles resist settling rapidly to the bottom of a vessel due to Brownian motion. Emulsions are an example of colloids composed of tiny particles suspended in another immiscible (unmixable) material. An emulsion is a suspension of two liquids that usually do not mix together.

Which cation caused the rapid flocculation?

Clay particles usually possess net negative charge and therefore they electrostatically attract positively charged ions, such as Ca2+ cations, which form bridges, holding the particles together. Therefore, these cations can induce flocculation of clay particles.

What are flocculants made of?

The aluminum-based flocculants include aluminum sulfate, aluminum chloride, sodium aluminate, aluminum chlorohydrate, and polyaluminum chloride. The iron-based flocculants include ferric chloride, ferric sulfate, ferrous sulfate, and ferric chloride sulfate [15, 69].

Which type of suspension is more stable?

Suspension is more stable. This is because suspension does not mix with each other. The denser particles settle down at the bottom and makes the solution stable.

In which suspension particles are suspended rapidly?

In flocculated suspension, formed flocs (loose aggregates) will cause increase in sedimentation rate due to increase in size of sedimenting particles. Hence, flocculated suspensions sediment more rapidly.

Why rheology is important for suspension stability?

Rheologic consideration is of great importance in the study of the stability of pharmaceutical suspensions. This is because the viscosity of a suspension can modify the sedimentation rate. The viscosity of a liquid is a measure of its resistance to flow.