An Introduction to the Chemistry of Colloids; A Compendium of Colloidal Chemistry for Students, Teachers and Works Managers (Paperback)

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: jellies, this process being more energetic the smaller the concentration of the jelly's disperse phase. This prevents the normal process of chemical action, such as takes place in solution when a precipitate forms by intimate admixture, and causes peculiar precipitate patterns to arise, as, for example, the Liesegang stratification figures (Liesegangschen Schichtungsfiguren). III. The Relation of Colloidal Solutions to Solutions Proper and to Suspensions. We will now consider somewhat more thoroughly the relationship between colloidal and crystalloidal solutions. As already described, the general characteristics of the latter are the ability to diffuse, osmotic pressure, capability of the dissolved (solid) body to crystallise from saturated solutions. The question arises whether mixtures which lack the charactistics mentioned (colloidal solutions or hydrosols) may be classed in general as solutions in the sense required by Wilhelm Ostwald and W. Nernst, who define solutions as homogeneous mixtures, or physical mixtures of homogeneous phases. In this definition the criteria mentioned above are not in any way included ? i.e., they are not considered ? the questionnaturally depends on establishing the fact whether colloidal solutions are homogeneous or not. True solutions are homogeneous in as much as they neither separate mechanically into components, nor may any solid particles be recognised by optical methods?i.e., by the naked eye or by means of optical instruments. Many colloidal solutions prove themselves mechanically inseparable, since they pass through filter paper, even if slowly. R. Zsigmondy has been able to filter a colloidal gold solution unchanged through a clay cell. Nevertheless, lack of homogeneity may be proved in colloidal solutions by optical means, using...

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: jellies, this process being more energetic the smaller the concentration of the jelly's disperse phase. This prevents the normal process of chemical action, such as takes place in solution when a precipitate forms by intimate admixture, and causes peculiar precipitate patterns to arise, as, for example, the Liesegang stratification figures (Liesegangschen Schichtungsfiguren). III. The Relation of Colloidal Solutions to Solutions Proper and to Suspensions. We will now consider somewhat more thoroughly the relationship between colloidal and crystalloidal solutions. As already described, the general characteristics of the latter are the ability to diffuse, osmotic pressure, capability of the dissolved (solid) body to crystallise from saturated solutions. The question arises whether mixtures which lack the charactistics mentioned (colloidal solutions or hydrosols) may be classed in general as solutions in the sense required by Wilhelm Ostwald and W. Nernst, who define solutions as homogeneous mixtures, or physical mixtures of homogeneous phases. In this definition the criteria mentioned above are not in any way included ? i.e., they are not considered ? the questionnaturally depends on establishing the fact whether colloidal solutions are homogeneous or not. True solutions are homogeneous in as much as they neither separate mechanically into components, nor may any solid particles be recognised by optical methods?i.e., by the naked eye or by means of optical instruments. Many colloidal solutions prove themselves mechanically inseparable, since they pass through filter paper, even if slowly. R. Zsigmondy has been able to filter a colloidal gold solution unchanged through a clay cell. Nevertheless, lack of homogeneity may be proved in colloidal solutions by optical means, using...

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Product Details

General

Imprint

General Books LLC

Country of origin

United States

Release date

February 2012

Availability

Supplier out of stock. If you add this item to your wish list we will let you know when it becomes available.

First published

February 2012

Authors

,

Dimensions

246 x 189 x 1mm (L x W x T)

Format

Paperback - Trade

Pages

24

ISBN-13

978-0-217-16861-8

Barcode

9780217168618

Categories

LSN

0-217-16861-2



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