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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Incorporação de solutos não iônicos em micelas de alquil óxido de difenila dissulfonados / Incorporation of non ionic solutes in alkyl diphenyloxide disulfonate micelles

Argenton, André Bozzo 17 September 2003 (has links)
A solubilização de compostos não iônicos em micelas de detergentes é uma propriedade intensamente estudada e de grande importância prática. Algumas das aplicações onde a compreensão da solubilização é relevante são detergência, recuperação de solos contaminados e catálise. Em trabalho anterior, o grupo do prof. Quina demostrou que o modelo de relações lineares de energia livre (LSER) é uma poderosa ferramenta para correlação da eficiência de solubilização com parâmetros relacionados com a estrutura do soluto. No presente trabalho, constantes de incorporação micelar, Ks, foram determinadas experimentalmente para uma série de solutos de diferentes estruturas para os detergentes comerciais decil óxido de difenila dissulfonado (DOWFAX C10) e hexadecil óxido de difenila dissulfonado (DOWFAX C16). Verificou-se, para esses detergentes, que a variação do log Ks com o volume molar, Vx, do soluto é distinta para classes homólogas de solutos polares (álcoois e cetonas) e apolares (alcanos, aromáticos e alcinos), indicando a existência de microambientes de solubilização distintos A demonstração, neste trabalho, de que o modelo de LSER não é apropriado para correlacionar dados de Ks, na presença de mais de um microambiente de solubilização, aumenta a validade de estudos prévios, com detergentes de estrutura mais simples, onde a suposição de um único microambiente de solubilização mostrou-se adequada. / The solubilization of non ionic molecules in detergent micelles is a property that has been extensively investigated and that is of great practical importance. Several applications in which solubilization is of relevance are detergency, remediation of contaminated soils and catalysis. In earlier work, the group of Prof. Quina has shown that linear free energy relationships (LSER) are a powerful tool for correlating the efficiency of solubilization with the structure of the solute. In the present work, micellar incorporation coefficients, Ks, were determined for solubilization of a series of solute of diverse structures in two commercial detergents: decyl diphenyl oxide disulfonate (DOWFAX C10) and hexadecyl diphenyl oxide disulfonate (DOWFAX C16). For these detergents it is shown that the dependence of log Ks on solute molar volume is distinct for homologues series of polar (alcohols and ketones) and non-polar (alkanes, alkynes and aromatics) solutes, implying the existence of distinct solubilization microenvironments for these two classes of solutes. The demonstration in the present work that the LSER approach fails to correlate Ks data when more than one solubilization microenvironment is present reinforces the validity of previous studies with detergents of simpler structure where the assumption of a single solubilization microenvironment was found to be adequate.
2

Incorporação de solutos não iônicos em micelas de alquil óxido de difenila dissulfonados / Incorporation of non ionic solutes in alkyl diphenyloxide disulfonate micelles

André Bozzo Argenton 17 September 2003 (has links)
A solubilização de compostos não iônicos em micelas de detergentes é uma propriedade intensamente estudada e de grande importância prática. Algumas das aplicações onde a compreensão da solubilização é relevante são detergência, recuperação de solos contaminados e catálise. Em trabalho anterior, o grupo do prof. Quina demostrou que o modelo de relações lineares de energia livre (LSER) é uma poderosa ferramenta para correlação da eficiência de solubilização com parâmetros relacionados com a estrutura do soluto. No presente trabalho, constantes de incorporação micelar, Ks, foram determinadas experimentalmente para uma série de solutos de diferentes estruturas para os detergentes comerciais decil óxido de difenila dissulfonado (DOWFAX C10) e hexadecil óxido de difenila dissulfonado (DOWFAX C16). Verificou-se, para esses detergentes, que a variação do log Ks com o volume molar, Vx, do soluto é distinta para classes homólogas de solutos polares (álcoois e cetonas) e apolares (alcanos, aromáticos e alcinos), indicando a existência de microambientes de solubilização distintos A demonstração, neste trabalho, de que o modelo de LSER não é apropriado para correlacionar dados de Ks, na presença de mais de um microambiente de solubilização, aumenta a validade de estudos prévios, com detergentes de estrutura mais simples, onde a suposição de um único microambiente de solubilização mostrou-se adequada. / The solubilization of non ionic molecules in detergent micelles is a property that has been extensively investigated and that is of great practical importance. Several applications in which solubilization is of relevance are detergency, remediation of contaminated soils and catalysis. In earlier work, the group of Prof. Quina has shown that linear free energy relationships (LSER) are a powerful tool for correlating the efficiency of solubilization with the structure of the solute. In the present work, micellar incorporation coefficients, Ks, were determined for solubilization of a series of solute of diverse structures in two commercial detergents: decyl diphenyl oxide disulfonate (DOWFAX C10) and hexadecyl diphenyl oxide disulfonate (DOWFAX C16). For these detergents it is shown that the dependence of log Ks on solute molar volume is distinct for homologues series of polar (alcohols and ketones) and non-polar (alkanes, alkynes and aromatics) solutes, implying the existence of distinct solubilization microenvironments for these two classes of solutes. The demonstration in the present work that the LSER approach fails to correlate Ks data when more than one solubilization microenvironment is present reinforces the validity of previous studies with detergents of simpler structure where the assumption of a single solubilization microenvironment was found to be adequate.
3

Exploring Småland’s cultural business approach : An understanding of Småland’s firms’ road to internationalization “Å de o då va”

Ljung, Sebastian, Mattsson, Teddy January 2024 (has links)
Småland is a region within Sweden that has many successful businesses that have internationalized to other markets with adequate results. IKEA, Husqvarna, Norden Machinery, and many more are prime examples of firms that have made successful entries to other markets. Therefore, this study aims to find the fundamental reasons why Småland businesses are so successful in their internationalization process, and how the culture of the region Småland may affect the process as a whole. Firms of different sizes have been given the opportunity to share their insights and opinions about their internationalization process, and how Småland functions as a suitable business environment. Furthermore, this study strives to give a dynamic and unique perspective of Småland’s business culture functions in the business world. The study has a qualitative method with a thematic and abductive approach which allows the authors to draw their own conclusions based on the appendix and ask open-ended questions as well as follow-up questions. Different theoretical frameworks such as the Uppsala Model, institutional theory, market selection process, and three pillars of Hofstede’s value dimensions have been used in order to conduct an adequate analysis of the research question. Moreover, the gathered data from the participants in the study has been used to link it to the different theories used, as well as emphasize our own opinion on the relevant matter. Småland’s business culture plays a vital role within organizations and their internationalization endeavors.

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