The crystal morphology and growth rates of triclinic N-docosane crystallising from N-dodecane solutions

A detailed analysis of the crystal morphology of triclinic n-docosane (C22H46) is presented together with a preliminary assessment of the supersaturation-dependence of the growth rates for the predicted (hkl) faces. A methodology to index the experimentally observed crystal faces, based on a combined BFDH and zone axis methodology is defined. Analysis using this methodology yields the morphological indexation of n-docosane to be (001), (112), (102), (010), and (1 - 33) or (130) based on the expected triclinic crystal structure. Crystals of n-docosane growing from supersaturated n-dodecane (C12 H26) solutions, as studied using in-situ optical microscopy, at three different supersaturation (σ) levels 0.01, 0.02 and 0.05, reveal that the crystal morphology changes with increasing in supersaturation, evolving from a habit consistent with a triclinic crystal system to a habit that is perhaps more representative of an orthorhombic structure. Growth rates determined for the (112) and (102) faces as well as for those less dominant faces range between 0.51 and 9.85 mm/s, in good agreement with previously reported data for other organic molecules including n-alkanes

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This paper is about teachers ‘attitudes towards their pupils, both today and in the past. It describes various events with Adam, Elsa and Kajsa which I have observed at my preschool. Via a retrospective analysis I have attempted to understand how teachers ‘views of their pupils has changed from the beginning of the century to the present day. One of the questions was: How do preschool teachers pay attention to pupil’s participation? The school curriculum, equality plan and the United Convention on the Right of the Child were used as help documents during the preparation of this paper. In order to answer to the question, I have taken note of the various kinds of literature and theories, such as those of Vygotsky

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This paper is about teachers ‘attitudes towards their pupils, both today and in the past. It describes various events with Adam, Elsa and Kajsa which I have observed at my preschool. Via a retrospective analysis I have attempted to understand how teachers ‘views of their pupils has changed from the beginning of the century to the present day. One of the questions was: How do preschool teachers pay attention to pupil’s participation? The school curriculum, equality plan and the United Convention on the Right of the Child were used as help documents during the preparation of this paper. In order to answer to the question, I have taken note of the various kinds of literature and theories, such as those of Vygotsky

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This paper is about teachers ‘attitudes towards their pupils, both today and in the past. It describes various events with Adam, Elsa and Kajsa which I have observed at my preschool. Via a retrospective analysis I have attempted to understand how teachers ‘views of their pupils has changed from the beginning of the century to the present day. One of the questions was: How do preschool teachers pay attention to pupil’s participation? The school curriculum, equality plan and the United Convention on the Right of the Child were used as help documents during the preparation of this paper. In order to answer to the question, I have taken note of the various kinds of literature and theories, such as those of Vygotsky