José J.C. Teixeira Dias
  Full professor  
   
  phone: 234 370 200  
  extension: 33523  
  e-mail: teixeiradias@ua.pt  
  department: Chemistry  
   
  line: 1 - information and communication technology
 
  direct url: http://www.ciceco.ua.pt/JoseTDias  
   
Short CV

Researcher ID : H-6914-2013

ORCID : http://orcid.org/0000-0002-0096-1712

 

D. Phil. in Chemistry in 1970 at the University of Sussex, UK, with thesis on Quantum Chemistry (Intermolecular Forces) and Raman Spectroscopy.

Professor of Chemistry at the University of Coimbra since 1980 up to 1995, and at the University of Aveiro since 1995 up to the present.

Fellow of the Royal Society of Chemistry with the Chartered Chemist (CChem) distinction since 1991, and recipient of the award Chartered Scientist (CSci) by the Science Council in the UK since 2004.

Author or coauthor of more than 150 papers in Web of Science cited more than 1500 times without self-citations (h-index 22). Recipient of the Prize for Scientific Excellence awarded by the Portuguese Science Foundation in 2004.

Editor of "Molecular Liquids: New Perspectives in Physics and Chemistry", NATO ASI Series C: Mathematical and Physical Sciences, vol. 379, Kluwer Academic Publishers, 1992.

Author of three university student manuals in Portuguese published by Calouste Gulbenkian Foundation in Lisbon: "Química Quântica - Fundamentos e Métodos", 1982, "Espectroscopia Molecular - Fundamentos, Métodos e Aplicações", 1986, "Química-Física - Uma Introdução", 2012.

Scientific Interests

The ability of β-cyclodextrin (cyclomalto-heptaose, βCD) to include guests of suitable size is derived mainly from its cavity (a hollow truncated cone) that provides a large number of close contacts with the guest increasing the dispersion energy for the host-guest interaction.

This research work is mainly focused on cyclodextrins, in particular, on βCD, its hydration in the solid, its inclusion of amphipathic guests and surfactant molecules in aqueous solution and the effect of strong electrolytes.

More recently, methylated and unsubstituted cyclodextrins have been studied in relation with their distinct ways of interacting with micelles. In particular, small-angle neutron scattering is used to study the influence that methylated and unsubstituted cyclodextrins have on sodium decanoate micelles in D2O aqueous solution.

For α-cyclodextrin and β-cyclodextrin, the intensity of the correlation peaks decreases and the peaks broaden with the increase of initial concentration whereas, for TRIMEB (trimethyl-βCD), the intensity increases and the correlation peaks sharpen with the initial concentration increase.

Figure_1

For high Q values, the Porod equation enables to evaluate S/V which is the specific interfacial area. For native cyclodextrins, S/V is approximately independent of the initial cyclodextrin concentration, whereas for methylated cyclodextrins, S/V increases linearly with the increase of the initial cyclodextrin concentration, with slopes that increase in the order DIMEB (dimethyl-βCD) < TRIMEA (trimethyl-αCD) < TRIMEB. Thus, methylated and unsubstituted cyclodextrins exhibit distinct behaviors!

 Figure_2

When sodium decanoate micelles are made "invisible" under small-angle neutron scattering by deuteration of the decanoate chain, unsubstituted and methylated cyclodextrins behave differently.

Figure_3

For a sodium decanoate spherical micelle, the free region of the electric double layer is neither completely water-like nor hydrocarbon-like. The Debye length of the double layer is approximately the height of a methylated cyclodextrin molecule.

It is suggested that methylated cyclodextrins are more easily adsorbed by the sodium decanoate micelles than native cyclodextrins. Once adsorbed, the methylated cyclodextrins originate a correlation peak. Then, the perdeuterated sodium decanoate micelles become "visible", as observed!

Figure_4

Teaching Activity

In the last fifteen years, JTD has been involved in the teaching and coordination of Chemistry to first year students of Science and Engineering courses at the University of Aveiro. He is the author of a university student manual in Portuguese entitled "Química-Física - Uma Introdução", published in 2012 by Calouste Gulbenkian Foundation in Lisbon.

 capa livro

In collaboration with colleagues of the Department of Education of the University of Aveiro, he has carried out research on students' questioning in Chemistry.

 

"The interplay between students' perceptions of context and approaches to learning"

Almeida, P.A.; Teixeira-Dias, J.J.; Martinho, M.; Balasooriya, C.D.

Research Papers in Education, 2011, 26, 149-169 DOI: 10.1080/02671522.2011.561975

 

"Improving the Scholarship of Teaching and Learning through Classroom Research"

Almeida, P.A.; Teixeira-Dias, J.J.; Medina, J.

Technology Enhanced Learning: Quality of Teaching and Educational Reform Book Series: Communications in Computer and Information Science, 2010, 73, 202-208

 

"Teaching for Quality Learning in Chemistry"

Teixeira-Dias, J.J.C.; De Jesus, H.P.; De Sousa, F.N.; Watts, M.

Int. J. Science Education, 2005, 27, 1123-1137 DOI: 10.1080/09500690500102813

 

"Questions of Chemistry"

De Jesus, H.P.; Teixeira-Dias, J.J.C.; Watts, M.

Int. J. Science Education, 2003, 25, 1015-1034 DOI: 10.1080/0950069022000038295

Selected Publications

1- "Why do methylated and unsubstituted cyclodextrins interact so differently with sodium decanoate micelles in water?"

Andrade-Dias, C.; Lima, S.; Teixeira-Dias, J.J.C.; Teixeira, J.

J. Phys. Chem. B, 2008, 112, 15327-15332 DOI: 10.1021/jp807167h

 

2- "From simple amphiphilic to surfactant behavior: analysis of 1H NMR chemical shift variations"

Andrade-Dias, C.; Lima, S.; Teixeira-Dias, J.J.C.

J. Colloid Interface Sci., 2007, 316, 31-36 DOI: 10.1016/j.jcis.2007.07.049

 

3- "How alkali-metal cations affect the inclusion of decanoic acid in β-cyclodextrin"

Lima, S.; Goodfellow, B.J.; Teixeira-Dias, J.J.C.

J. Phys. Chem. B, 2003, 107, 14590-14597 DOI: 10.1021/jp035167

 

4- "Solid state inclusion of the nonionic surfactant C12E4 in β-cyclodextrin at various humidities: a combined Raman and 13C CP MAS NMR study"

Cunha-Silva, L.; Teixeira-Dias, J.J.C.

J. Phys. Chem. B, 2002, 106, 3323-3328 DOI: 10.1021/jp013899

 

5- "Dynamics of H/D and D/H exchanges in β-cyclodextrin dodecahydrate observed in real time: effects from zero-point vibrational energy"

Da Silva, A.M.; Steiner, Th.; Saenger, W.; Empis, J.; Teixeira-Dias, J.J.C.

Chem. Comm., 1997, 465-466 DOI: 10.1039/a607721h

 

6- "Hydration and dehydration processes of β-cyclodextrin: a Raman spectroscopic study"

Da Silva, A.M.; Steiner, Th.; Saenger, W.; Empis, J.; Teixeira-Dias, J.J.C.

J. Inclusion Phenomena Molec. Recognition Chem., 1996, 25, 21-24

 

7- "Rapid water diffusion in a cage-type crystal-lattice β-cyclodextrin dodecahydrate"

Steiner, Th.; Da Silva, A.M.; Teixeira-Dias, J.J.C.; Muller, J.; Saenger, W.;

Angewandte Chem. Int. Ed. Eng., 1995, 34, 1452-1453 DOI: 10.1002/anie.199514521

 
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