Sérgio Mascarenhas de Oliveira, Brazilian physicist (Rio de Janeiro 02 May 1928 – Ribeirão Preto, São Paulo State 31 May 2021)

ACHIEVEMENTS

World authority on dielectrics and Costa Ribeiro effect

Authored nearly 200 publications   

One of the first in the world that extended and melt monocrystals to study charges release

First to note the appearing of electrical charges during a solid sublimation

Observation of the Costa Ribeiro effect in the process of sublimation of para-phenilene diamine. Anais Acad. Bras. Ciencias 26:345-8, 1954

Showed that heat transmission through a fluid dielectric was intensely affected by the action of electric fields known as electrothermal conductivity effect or Mascarenhas effect (1955-6)

Eletro-termo-condutividade. Escola Eng. São Carlos, 1956 (Thesis)

With Y.P. Mascarenhas, M.F. Souza & R.F. Rabello. Thermal conduction of liquid dielectrical fields (fatty acids). Anais Acad. Bras. Ciencias 28:96-8, 1956

O novo método do germen monocristalino e a nova análise do efeito Costa Ribeiro (1958)

Established a molecular theory about formation of a double layer on solid-liquid or solid-gas interface

Created the concept of electrets in biomolecules, i.e. biolectrects and coined the term

The electret effect in bone and biopolymers and the bound water problem. Ann. N.Y. Acad. Sci. 238:36-52, 1974

Discovered radiation-induced bone magnetism effect

Showed that the irradiation of bone and teeth produces paramagnetic centers in their inorganic components (1971) and that these centers can be used for dosimetry of radiation 

Discovered residual magnetism phenomenon in bones (1972) 

Co-discovered electrical charging of amorphous ice

With L. Onsager & D.L. Staebler. Electrical effect during condensation and phase transitions of ice. J. Chem. Phys. 68(8):3823-8, 1978

Discovered many effects in solid state physics and new effects related to bone electric and magnetic properties  

Proved that changes in intracranial pressure deforms the bone structure of brain breaking the Monro-Kellie doctrine 

METHODS

A new method for the observation of the Costa Ribeiro effect and the experimental analysis of this phenomenon. Anais Acad Bras Ciências 31:395-404, 1959

With Celaschi introduced thermal stimulated pressure as a new technique for the study of bound-water and hydration isotherm of biological molecules in Biophys J. 20:273, 1977

With J.N. Onuchic. A new system for thermal stimulated pressure measurements of biological molecules (1980)

Developed a new method of archaeological dating employing electronic paramagnetic resonance that named dosimetry by magnetic memory (1998)

With Silvio Crestana introduced computerized tomography in farming and cattle raising studies and non-destructive assays of materials

Developed a technique for bone fractures solidification employing electric currents

Developed photo elastic technique for very low temperatures

With A.A. Carvalho, M.H. de Paula & J.R. Cameron. Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x-rays. Medical Physics 19(3):575-7, 1992

DEVICES DEVELOPED

With F. Gambirasio  & Y.P. Mascarenhas. CO2 electrostatic generator.. American Journal of Physics 26:563-566, 1958.

With Y.P. Mascarenhas. Diffraction camera for precision measurements of lattice parameters at low temperatures. Review of Scientific Instruments 38:141-142, 1967.

With H. Vargas & C.L. Cesar. Photoacoustical radiation dosimeter. Med. Phys. 11(1): 73-4, 1984

With A.A  Carvalho, J.R. Cameron &  M.H. de Paula. Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays. Medical Physics 19(3): 575-577, 1992

With José C. Pereira a x-ray dosimeter with electrets vibrating membrane 

With L.E.G. Damiano, G.H.F. Vilela et al. A new non-invasive system to measure intracranial pressure. In 14^th International Conference on Intracranial pressure and brain monitoring, 1:236, 2010, Tubingen 

BrainStrap, a non-invasive method for measuring intracranial pressure employing a sensor device  

His wife, Yvonne Primerano Mascarenhas, crystallographer (Pederneiras, São Paulo State 21 July 1931 –

Authored 172 papers

First to observe a bifurcated binding of hydrogen in violuric acid

With B.M. Craven. The Crystal structure of perdeuterated violuric acid mono-hydrate the x-ray diffraction analysis. Acta Crystall. Sect. A 17:407, 1964

Determinated the crystal structure of oxytocin

With S.P. Wood, I. J. Tickle, T.L. Blundell, V.J. Hruby et al. Crystal structure analysisof deamino-oxytocin conformational flexibility and receptor binding. Science 232 (4750):633-6, 1986

With D. Atencio, J.M.V. Coutinho & J. Ellena described the mineral species matioliite (2006) and menezesite (2008)

DEMONSTRATED NEW COMPUNDS

With F.G. Souza, V.A. S. Falcomer, J.D. Ardisson, J. Valdés-Martínez & S. Hernandez-Ortega. Synthesis, 119Sn Mosbauer spectroscopic studies and x-ray crystal structure determination of new seven-coordinate diorganotion(IV) complexes with S,N,N,N,S-pentadentate Schiff bases derived from 2,6-diacetylpyridine of S-methyl- and S-benzyldithiocarbazates. Transition Metal Chemistry, 31:753-759, 2006.

With C.L.M. Pereira, E.F. Pedroso, A.C. Doriguetto, J. Ellena, A. Aukauloo, Y. Jopurnaux & H.O. Stumpf. [Ph4P]2[Cu(dbpzba)]: um Novo Precursor de Magnetos Moleculares. Livro de Resumos, 27ª Reunião Anual da Sociedade Brasileira de Química e XXVI Congreso Latinoamericano de Química, 2004, Salvador/BA p. QI142 (2004)

With A.C. Doriguetto, H.S. Vieira, J. Ellena, J.A. Takahashi, M.A.D. Boaventura. A novel diterpene lactone. Acta Crystallographica. Section E 58:1392-4, 2002.

With J.G. Nery & A.K. Cheetham. A Study of the New Ion Exchanged Derivatives of Highly Crystalline Low-Silica Map.  Collected Abstracts, International Union of Crystallography XVIII Congress and General Assembly, 1999, Glasgow, Scotland. p. 463, 1999

With G.D.F. Silva, L.P. Duarte, H.C.S. Paes, J.R. Sousa, M.M.C. Nonato & P.J.I. Portezani. 3-Epiabruslactone A, a New Triterpene Lactone isolated From Austroplenckia Populnea. J. Braz. Chem. Soc. 9(5):461-4, 1998.

With I. Vencato, A. Neves & A. Metran. A new orthorhombic crystal from of [‘FE'(BBPPN) ] ‘CL’O IND.4’½ ‘C IND.2’H IND.2’0. In: Reunião Anual da Sociedade Brasileira de Cristalografia, Campinas. p. 26, 1995

With A. Neves, A. Metran, I. Vencato, V. Drago, M. Horner, K. Griesar & W. Haase. Structure and magnetic properties of a new tetranuclear oxo-hydroxo-alkoxo iron (III) cluster as a model for Fe. In: 21ª Congresso Latinoamericano de Química, 1994, Panama p. 127, 1994

With A. Neves, S.M.D. Erthal, I. Vencato, A.S. Ceccato, O.R. Nascimento, M. Horner & A.A. Batista. Synthesis, Crystal Structure And Electrochemical And Spectroeletrochemical Properties Of The New Manganese (Iii) Complex [Mn (Bbpen)] [Pf6] [H2 Bbpen=N, N-Bis (2-Hidroxybenzyl)-N, N-Bis (2-Methylpyridyl) Ethylenediamine]. Inorg. Chem. 31:4749-55, 1993.

With A. Neves, M.A. Brito, I. Vencato, V. Drago, K. Griesar & W. Haase. Synthesis, Crystal Structure And Properties Of A New Binuclear Iron (Iii)Complex As A Model For The Purple Acid Phosphatases. Inorg. Chim. Acta., 214, 1993.

With A. Neves, A.S. Ceccato, I. Vencato & C. Erasmus-Bhur. Synthesis, structures and electrochemical characterization of a new mon-oxo vanadium (IV) complex. J. Chem. Soc. Chem. Comm. 8:652-4, 1992.

With J.R. Souza, G.D.F. Silva, A.B. Cota & M. Garcia. Ocorrência de um triterpeno friedelanico inédito em Austroplenckia populnea. Ciência e Cultura 41:489-489, 1989

With E. Mattievich, S.R.N. Silva & I. Vencato. Resultados preliminares relativos à nova série isoestrutural, o fosfato triclínico: Fe2+ 7-x Fe3+x(PO4II) 4-x (PO)2+x : 0<x<4. In: Terceiro Encontro Nacional de Espectroscopia Mossbauer, 1984, Soc. Bras. Física (1984)

With A.A. Craveiro, E.R. Silveira & R. Braz Filho. Sonderianin, a new furanoid diterpene of Croton sonderianus Muell. Arg. Phytochem.  20:852-4, 1981.

Others

With D.R. Ardila, M.R.B. Andreeta, S.L. Cuffini, A.C. Hernandes & J.P. Andreeta. Preparação e caracterização de cerâmicas de ‘SR’TI’O IND.3’obtidas via um novo processo de reação no estado sólido. In: Encontro Nacional de Física da Matéria Condensada, 1995, Caxambu. Sociedade Brasileira de Física. São Paulo: Sociedade Brasileira de Física, p. 172-3, 1995

With A. Neves, S.M.D. Erthal, M.A. Brito, I. Vencato, V. Drago, Griesar & W. Haase. New synthetic models for the active site of purple acid phosphatases. 21ª Congresso Latinoamericano de Química, Panama. p.109, 1994

With S.R. Teixeira & J.A. Rodrigues. Construção e aplicação de uma câmara de difração de raios-x, a quente, para o estudo de reação entre ‘NB’- ‘TI’e ‘N IND.2’. Encontro Nacional de Física da Matéria Condensada, Caxambú. Sociedade Brasileira de Física. (1987)

HONOURS

IUPAC 2017 Distinguished Women in Chemistry or Chemical Engineering Awards