�ber Ionotropie

Thiele, Heinrich; Micke, Heinrich

doi:10.1007/bf01522372

Cited by 5 publications

(1 citation statement)

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“…The conditions of the gel formation have been investigated and the degree of orientation of the particles in the gel measured with a quartz compensator in polarized light under similar conditions has been found to be reproducible. 54 Complete reversibility was found for the sol-gel transformation, for swelling and shrinking, and for the ion-exchange reaction.…”

Section: Orientation and Gelationmentioning

confidence: 92%

Ordered coagulation and gel formation

Thiele¹

1954

Discuss. Faraday Soc.

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Section: Orientation and Gelationmentioning

confidence: 92%

Ordered coagulation and gel formation

Thiele¹

1954

Discuss. Faraday Soc.

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Interstitial Compounds of Graphite

Hennig

1959

Progress in Inorganic Chemistry

147

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Geordnete Kristallisation. Nucleation und Mineralisation

Thiele¹

1967

J. Biomed. Mater. Res.

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Summary .With the help of ioriotropic gels it is possible to duplicate native structures consisting of two materials, one of them the matrix. 2. Counter-ions combined with the ionic groups on the ordered polyelectrolytes can be exchanged. With certain counter-ions an insoluble, crystalline precipitate is formed immediately after the ion-exchange process as an ordered reaction product, i.e., nucleation. 3. Ionotropic gels were crosslinked through the secondary hydroxyl groups (uronic acid residuals) in such a way that the rate of ion exchange was only slightly lower, that no great shrinkage resulted, and that the pores remained free of extraneous polymers. 4.The microscopic structure of ionotropic gels can be divided into ( a ) a part with secondary structure with micellar particles and hollow pores and ( b ) a part with tertiary structure with lamellae and isopores. 5. On crystallization in shrunken gels the crystals enter into the tertiary structure-both intracapillary as well as interlamellar-due to spatial reasons. 6. Through control of the shrinkage of the gels, one can regulate the way in which the ordered crystals enter into the two structures. 7 . One can change the size of the crystallites by variation of the degree of crosslinking. The higher the degree of crosslinking, the smaller the crystallite. 8. By treatment with waves of ions one can increase the solid content of the gel to values from 50 to 70%. One obtains gels with a mechanical strength like that of bones, teeth, shells, or pearls. The phenomenon of intramicellar crystallization is reversible. Monovalent counter-ions, as well as H-ions, dissolve and extract the included secondary substance. One then obtains the original crosslinked gel.Without the ordered base structure (matrix) one obtains unordered crystallites such as occur in the chalklike fields of the pearl shells.10. The gel has always to be formed first.Gewebe siud l d o i d e Gebildc, aufgebaut aus eineiii rauinlichen S e t z voii georclneten E'adenmolekiilcn. Diese Ordnung erkeririt inan in1 polarisierten Licht an der Doppelbrechung. Die Alinerali- 213

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�ber Ionotropie

Cited by 5 publications

References 0 publications

Ordered coagulation and gel formation

Ordered coagulation and gel formation

Interstitial Compounds of Graphite

Geordnete Kristallisation. Nucleation und Mineralisation

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