Search results
1766 - Pierre-Joseph Macquer, in his Dictionnaire de Chymie, promoted mechanisms of crystallization based on the idea that crystals are composed of polyhedral molecules ( primitive integrantes ). [4] 1772 - Jean-Baptiste L. Romé de l'Isle developed geometrical ideas on crystal structure in his Essai de Cristallographie.
- The Reduction of Real Properties
- Haüy’S Theory of Structure of 1792: A Step Towards Generalization
- The Traité de Mineralogy of 1801
- The Final Studies: A New Classification, The Law of Symmetry
René–Just Haüy, originally a botanist, comes to mineralogy thanks to one of Daubenton’s classes. He wants to extend to crystals Linné’s classification which distinguishes the number of petals of flowers. He wants to ignore Romé de l’Isle’s work, and for this reason forges the tale of a chance discovery of the cleavages of calcite. From 1881 to 1884...
In the 1792 work l’Exposition abrégée de la théorie sur la structure des cristaux, Haüy describes the mechanical divisions and observations which allow the distinction of primitive forms and the multiple secondary forms of each crystal studied (Haüy 1792). It is this diversity which Haüy wants to scale down by the unity of the theory. As crystals c...
The precise measurements which Haüy carried out on all the physical properties of crystals and his relations with Laplace lead to his selection, despite him being both a naturalist and quite weak in mathematics, to give the physics lectures at the École Normale of year III (Guyon et al. 2006, 56–91). He devotes several lectures to crystallography a...
Berthollet had demonstrated that the chemical compositions of crystals could not be identical to that of their integrant molecules. Haüy accepts this criticism and changes his position with regards to the classification of crystals. In his final work, the Traité de Cristallographie (1822), he writes that “[…] it is only in Geometry that all crystal...
- Bernard Maitte
- bernard.maitte@univ-lille1.fr
- 2013
People also ask
Who developed the theory of crystallization based on a polyhedral molecule?
Who discovered crystal structure?
Who discovered polymorphism in molecular crystals?
How can crystal growth be controlled at the molecular scale?
A long-sought mechanistic picture of organic crystallization reveals how two dissimilar amorphous precursors gradually transform into crystals. Crystallization of Organic Molecules: Nonclassical Mechanism Revealed by Direct Imaging | ACS Central Science
- Yael Tsarfati, Shaked Rosenne, Haim Weissman, Linda J. W. Shimon, Dvir Gur, Benjamin A. Palmer, Bori...
- 2018
3.4A: Purification. Crystallization is an excellent purification technique for solids because a crystal slowly forming from a saturated solution tends to selectively incorporate particles of the same type into its crystal structure. A pure crystal is often slightly lower in energy than an impure crystal (or has a higher lattice energy), as ...
Dec 21, 2020 · Polymer crystallization-related study started before the concept of macromolecules was born, dating back to early 19th century when Gough examined the elasticity of a thong of Caoutchouc in 1806, and Page on natural rubber in 1847, although obviously, they were not aware that stretch-induced polymer crystallization accounted for the observed ela...
- Christopher Y. Li
- 2020
Jun 5, 2014 · ConspectusDuring the past two decades, many materials chemists have focused on the development of organic molecules that can serve as the basis of cost-effective and flexible electronic, optical, and energy conversion devices. Among the potential candidate molecules, metal-free or metal-containing conjugated organic molecules offer high-order electronic conjugation levels that can directly ...
Apr 3, 2017 · A general simulation approach that can replicate, and in theory predict, the growth of a wide range of crystal types, including porous, molecular and ionic crystals, is demonstrated. Understanding ...
