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First-Principles Prediction of Structures and Properties in Crystals

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Release : 2019-10-25
Genre : Science
Kind : eBook
Book Rating : 708/5 ( reviews)

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Book Synopsis First-Principles Prediction of Structures and Properties in Crystals by : Dominik Kurzydlowsk

Download or read book First-Principles Prediction of Structures and Properties in Crystals written by Dominik Kurzydlowsk. This book was released on 2019-10-25. Available in PDF, EPUB and Kindle. Book excerpt: The term “first-principles calculations” is a synonym for the numerical determination of the electronic structure of atoms, molecules, clusters, or materials from ‘first principles’, i.e., without any approximations to the underlying quantum-mechanical equations. Although numerous approximate approaches have been developed for small molecular systems since the late 1920s, it was not until the advent of the density functional theory (DFT) in the 1960s that accurate “first-principles” calculations could be conducted for crystalline materials. The rapid development of this method over the past two decades allowed it to evolve from an explanatory to a truly predictive tool. Yet, challenges remain: complex chemical compositions, variable external conditions (such as pressure), defects, or properties that rely on collective excitations—all represent computational and/or methodological bottlenecks. This Special Issue comprises a collection of papers that use DFT to tackle some of these challenges and thus highlight what can (and cannot yet) be achieved using first-principles calculations of crystals.

First-Principles Prediction of Structures and Properties in Crystals

Download First-Principles Prediction of Structures and Properties in Crystals PDF Online Free

Author :
Release : 2019
Genre : Electronic books
Kind : eBook
Book Rating : 710/5 ( reviews)

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Book Synopsis First-Principles Prediction of Structures and Properties in Crystals by : Dominik Kurzydlowski

Download or read book First-Principles Prediction of Structures and Properties in Crystals written by Dominik Kurzydlowski. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt: The term "first-principles calculations" is a synonym for the numerical determination of the electronic structure of atoms, molecules, clusters, or materials from 'first principles', i.e., without any approximations to the underlying quantum-mechanical equations. Although numerous approximate approaches have been developed for small molecular systems since the late 1920s, it was not until the advent of the density functional theory (DFT) in the 1960s that accurate "first-principles" calculations could be conducted for crystalline materials. The rapid development of this method over the past two decades allowed it to evolve from an explanatory to a truly predictive tool. Yet, challenges remain: complex chemical compositions, variable external conditions (such as pressure), defects, or properties that rely on collective excitations-all represent computational and/or methodological bottlenecks. This Special Issue comprises a collection of papers that use DFT to tackle some of these challenges and thus highlight what can (and cannot yet) be achieved using first-principles calculations of crystals.

Methods and Applications of Crystal Structure Prediction

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Author :
Release : 2018
Genre : Crystal growth
Kind : eBook
Book Rating : 709/5 ( reviews)

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Book Synopsis Methods and Applications of Crystal Structure Prediction by : Royal Society of Chemistry

Download or read book Methods and Applications of Crystal Structure Prediction written by Royal Society of Chemistry. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers key researchers representing the full scientific scope of the crystal structure prediction.

Predictions of Crystal Structures from First Principles

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Author :
Release : 2007
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Predictions of Crystal Structures from First Principles by :

Download or read book Predictions of Crystal Structures from First Principles written by . This book was released on 2007. Available in PDF, EPUB and Kindle. Book excerpt: A recently developed method denoted as SAPT(DFT), which applies symmetry-adapted perturbation theory (SAPT) based on Kohn-Sham orbitals and orbital energies and includes the dispersion component obtained using frequency-dependent density susceptibilities from density functional theory (DFT), has been shown to provide as accurate interaction energies as high-level wave function-based methods. At the same time, the former calculations can be performed at a greatly reduced computational cost compared to the latter, in fact, in a time comparable to supermolecular DFT calculations. The SAPT(DFT) method is particularly important for systems with a dominant dispersion component since the supermolecular DFT approach fails completely in this case. SAPT(DFT) was used to compute the interaction potential for the RDX dimer. This potential was applied to predictions of the properties of the RDX crystal in molecular dynamics simulations. The fully ab initio calculated properties are in excellent agreement with experiment and the predictions are even slightly better than achieved by empirical potentials fitted to the crystal experimental data.

Pharmaceutical Salts and Co-crystals

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Release : 2011-11-04
Genre : Medical
Kind : eBook
Book Rating : 503/5 ( reviews)

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Book Synopsis Pharmaceutical Salts and Co-crystals by : Johan Wouters

Download or read book Pharmaceutical Salts and Co-crystals written by Johan Wouters. This book was released on 2011-11-04. Available in PDF, EPUB and Kindle. Book excerpt: From crystal structure prediction to totally empirical screening, the quest for new crystal forms has become one of the most challenging issues in the solid state science and particularly in the pharmaceutical world. In this context, multi-component crystalline materials like co-crystals have received renewed interest as they offer the prospect of optimized physical properties. As illustrated in this first book_ entirely dedicated to this emerging class of pharmaceutical compounds_ the outcome of such endeavours into crystal engineering have demonstrated clear impacts on production, marketing and intellectual property protection of active pharmaceutical ingredients (APIs). Indeed, co-crystallization influences relevant physico-chemical parameters (such as solubility, dissolution rate, chemical stability, melting point, hygroscopicity, à) and often offers solids with properties superior to those of the free drug. Combining both reports of the latest research and comprehensive overviews of basic principles, with contributions from selected experts in both academia and industry, this unique book is an essential reference, ideal for pharmaceutical development scientists and graduate students in pharmaceutical science.

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