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Colloids and Surface Chemistry

• Simplest: tiny particles dispersed in water What is a colloid? Finely-divided dispersion of one phase in another Size of dispersed (“solute-like”) entity >> ordinary molecules Example: blood cell in water Solution homogeneous particles are molecules Colloid size 1–1000 nm particles remain suspended Suspension heterogeneous particles settle out

PDF	Introduction to Colloid and Surface Chemistry COPYRIGHTED – Porous materials Capillary condensation Cell membranes Lung surfactant Drug delivery

How are colloidal dispersions classified?
Colloids (or colloidal dispersions) can be classified according to the state of the dispersed phase and the dispersion medium (gas, liquid, solid), see Table 1.1, or according to their stability.
What is a good textbook for Chemistry & Colloid Chemistry?
as a stand-alone textbook for a general colloid and surface chemistry course. Then, there are some books, for example Hunter (1993) and Barnes and Gentle (2005), that focus either only on colloid or on surface science.
What are the dimensions of colloidal particles?
Typically, colloidal particles have one key dimension between 1 nm and 1 μm (micrometre). Adapted from Wesselingh et al. (2007), with permission from John Wiley & Sons, Ltd Figure 1.2 Thomas Graham (1805–1869), the pioneer in the study of colloidal systems, used the term colloids “ ” derived from the Greek word for glue ( colla ).
What is colloids chemistry?
Colloid Chemistry has always been an integral part of several chemical disciplines. Ranging from preparative inorganic chemistry to physical chemistry, researchers have always been fascinated in the dimensions and the possibilities colloids offer.

Oil industry

– Porous materials Capillary condensation Cell membranes Lung surfactant Drug delivery catalogimages.wiley.com

Membranes Separations

Filtering Flotation Protein analysis (MW,

nanotechnology

Electronics, semiconductors Extreme applications (space,

1.3 Three ways of classifying the colloids

Colloids (or colloidal dispersions) can be classified according to the state of the dispersed phase and the dispersion medium (gas, liquid, solid), see Table 1.1, or according to their stability. The most well-known colloids are emulsions (both phases are liquids), dispersions (solid particles in a liquid medium), foams (gases in liquids), liquids

1.4 How to prepare colloid systems

There are various ways to “trick ” particle formations and create a colloidal system. The most important ones are the ”aggregation of molecules or ions and ” Figure 1.8 Ouzo, an example of a colloidal system. The reduced transparency upon addition of water is due to the reduction of anise oil solubility in alcohol “grinding ” or “milling methods, t

1.5 Key properties of colloids

Colloidal systems are special and exciting in many ways. They have very interesting kinetic, rheologi-cal and optical properties (Chapters 8 and 9) which are important for their characterization (determina-tion of molecular weight and shape) and application. But their most important feature is possibly the large surface area, and this is why these

1.6 Concluding remarks

Colloids and interfaces are present and important in many (everyday) products and processes, ranging from food, milk and pharmaceuticals to cleaning agents and paints or glues. They are intimately linked and are best studied together. Colloids have many important, exciting properties of which stability is possibly the most important. Some propertie

Problem 1.2: Which ones are colloids?

You have the following three ingredients available: oil (a liquid) polymer (a low molecular hydrophobic liquid) water (a liquid) You are allowed to mix/blend two ingredients together into one sample. How many of the three resulting binary blends could be classified as colloids? For each sample state why/why not. In addition, give details about what

Problem 1.3

Try to characterize an interface in terms of thickness, molecular arrangement and importance for product properties. catalogimages.wiley.com

Problem 1.5

What particle shapes are possible for colloids? Give some examples. catalogimages.wiley.com

(L-7) Colloids Surface Chemistry JEE NEET By Arvind Arora

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