Utilize este identificador para referenciar este registo:
https://hdl.handle.net/10216/103293
Autor(es): | Cecília Ferreira Fernando A. Rocha Ana M. Damas Pedro M. Martins |
Título: | Running away from thermodynamics to promote or inhibit crystal growth |
Data de publicação: | 2012 |
Resumo: | Impurities/additives may be either detrimental or beneficial to many different crystal growth applications. Determined to a great extent by thermodynamics, their effects are hardly avoided once supersaturation, temperature, pH, and impurity content are established. In this work we introduce the rate of supersaturation variation R(sigma) as a new variable that can dramatically influence crystal growth relatively to steady-state conditions. We show that the crystal growth of a model protein can be accelerated, retarded, or even suppressed by altering R(sigma). Our results provide insight into the mechanism by which fast supersaturation variation prevents the adsorption equilibrium from being restored. When impurity adsorption onto kink sites gets delayed, crystal growth is enhanced and a "purifying" effect takes place. If, instead, impurity desorption from kink sites gets delayed, then a "poisoning" effect takes place. The same rationale is used to elucidate fundamental challenges that inspired this work. Included in this list are the nonlinear acceleration kinetics of growth layers and the growth rate hysteresis. While attenuating impurity incorporation, the purifying effect is expected to be important for the production of high quality lattices during single crystal growth. On the other hand, the poisoning effect opens new possibilities for crystal growth inhibition during pathological mineralization. |
Assunto: | Engenharia dos materiais Materials engineering |
Áreas do conhecimento: | Ciências da engenharia e tecnologias::Engenharia dos materiais Engineering and technology::Materials engineering |
URI: | https://hdl.handle.net/10216/103293 |
Informação Relacionada: | info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/BIA-PRO/101260/2008/Crescimento de Cristais de Proteínas com Propriedades de Difracção de Raios-X de Elevada Qualidade/PTDC/BIA-PRO/101260/2008 |
Tipo de Documento: | Artigo em Revista Científica Internacional |
Condições de Acesso: | restrictedAccess |
Aparece nas coleções: | FEUP - Artigo em Revista Científica Internacional ICBAS - Artigo em Revista Científica Internacional |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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60298.pdf Restricted Access | Artigo original publicado | 981.91 kB | Adobe PDF | Request a copy from the Author(s) |
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