Apresentação

O nosso departamento congrega docente que atuam em diversas áreas de pesquisa, notadamente Ciências dos Materiais, Física Computacional, Astrofísica, Cosmologia e Gravitação, Big Bang, Matéria Escura, Energia Escura, Relatividade Geral e teorias gravitacionais alternativas.. Temos um curso de bacharelado em física com ênfases em ciências dos materiais e física básica e um curso de Licenciatura em Física. Atuamos nos cursos de Pós-graduação em Física de Materiais (FIMAT), Rede Temática em Engenharia de Materiais - REDEMAT, Mestrado Profissional em Estudo de Ciência (MPEC) e outros programas em colaboração com outros departamentos da UFOP. 

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Primeiro perfil publicado Maria Auxiliadora Neves Nogueira, primeira professora do Departamento de Física da UFOP.

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Publicações Recentes do Departamento de Física

Lourenço GM, Keesen F, Fagundes R, Luna P, Silva AC, Ribeiro SP, Arashiro E. Recruitment and entropy decrease during trail formation by foraging ants. Insectes Sociaux [Internet]. 2019. Publisher's VersionAbstract
Social insects utilise a complex spatial orientation system mediated by chemical signals. This study investigated how the foraging behaviour of ants (Dorymyrmex thoracicus) varies depending on the quantity of an available resource using a field experiment. Further, we demonstrated computationally that ant displacement is compatible with a model based on pheromone deposition. Our experiment tested how the resource size (large or small) and availability (one or two simultaneous patches) of resources offered influence the number of recruited ants (traffic flow) and the speed of traffic flow both moving towards a resource and returning to the colony. The results showed that the returning flow was higher than the going flow independent of resource. The traffic flow towards a single resource was higher than the flow for either of two simultaneous resources patches offered; thus, multiple resources sources split the flow, regardless of the fact that resource size did not affect foraging choices. Our results indicated that the ants used an orientation mechanism that can be reproduced by a theoretical computer model. With our model, we showed that initially, the displacement of ants followed no clearly detectable pattern. However, with increasing levels of ant recruitment and consequent pheromone deposition on the most used trails, returning displacement revealed the formation of shorter and more organised trails. The model revealed key transition between periods of order and disorder that continued until the flow of information reached an organised state (Shannon entropy). This study highlights an exceptional mechanism of foraging optimisation in eusocial insects.
Boriero D, Schwarz DJ, Velten H. Flavour Composition and Entropy Increase of Cosmological Neutrinos After Decoherence. Universe [Internet]. 2019;5 (10). Publisher's VersionAbstract
We propose that gravitational interactions of cosmic neutrinos with the statistically homogeneous and isotropic fluctuations of space-time lead to decoherence. This working hypothesis, which we describe by means of a Lindblad operator, is applied to the system of two- and three-flavour neutrinos undergoing vacuum oscillations and the consequences are investigated. As a result of this decoherence we find that the neutrino entropy would increase as a function of initial spectral distortions, mixing angles and charge-parity (CP)-violation phase. Subsequently we discuss the chances to discover such an increase observationally (in principle). We also present the expected flavour composition of the cosmic neutrino background after decoherence is completed. The physics of two- or three-flavour oscillation of cosmological neutrinos resembles in many aspects two- or three-level systems in atomic clocks, which were recently proposed by Weinberg for the study of decoherence phenomena.
Calheiro DS, Bianchi RF. Tuning the detection limit in hybrid organic-inorganic materials for improving electrical performance of sensing devices. Sensors and Actuators A: Physical [Internet]. 2019;298 :111480. Publisher's VersionAbstract
Research in hybrid electronics has included advances in materials, devices and architectures. However, in practice, controversy still exists on some details which limit hybrid materials to high-performance applications, such as processing–structure–design–property relations. This paper describes a practical approach to enhancing the sensing performance of a prototype ammonia gas sensor based on electrical conductivity changes, percolation theory and current limitation to a semiconducting polymer-metal oxide medium. This device is based on fully-gravure printed polyaniline/indium - tin oxide nanocomposites, Pani100−xITOx [0 ≤ x≤ 100% (wt/wt)], layers on a freestanding high-density polyethylene substrate. We find that the electrical current of the device decreases and tends to saturate as the gas concentration increases, and the value of this electrical current limit (IL) depends on x: the higher the value of x, the smaller the IL, when the current that flows through the electronic device was dominated by the ITO-nanoparticle filled PAni, which increase the concentration of hopping carriers and contribute to the desired electrical response of a heterogeneous gas sensor. In this regime, we find a good linear relationship between x and ammonia concentration. These findings suggest new directions for future research on the development and investigation of organic-inorganic devices in which the electrical current variation is desired for enhanced sensitivity and stability of hybrid sensors.
Santos J, Barboza A, Matos MJS, Barcelos ID, Fernandes TFD, Soares EA, Moreira RL, Almeida Neves BR. Exfoliation and characterization of a two-dimensional serpentine-based material. Nanotechnology [Internet]. 2019. Publisher's VersionAbstract
We report on an experimental investigation of serpentine, an abundant phyllosilicate, as an alternative source of two-dimensional (2D) nanomaterials. We show, through scanning probe microscopy (SPM) measurements, that natural serpentine mineral can be mechanically exfoliated down to few-layer flakes, where monolayers can be easily resolved. The parent serpentine bulk material was initially characterized via conventional techniques like XRD, XPS, FTIR and Raman spectroscopies and the results show that it is predominantly constituted by the antigorite mineral. From ab initio calculations using DFT, we also determine the geometry and electronic structure of antigorite, the observed structural form of serpentine. Additionally, we further characterized electrical and mechanical properties of the obtained 2D material flakes using SPM and broadband synchrotron infrared nanospectroscopy. Wavelength tuning of the serpentine vibrational resonances, assigned to in- and out-of-plane molecular vibrations, are observed and compared with the FTIR characterization of the parent bulk material. They show that there is no degradation of serpentine`s structural properties during its mechanical exfoliation down to nanometer-thin sheets. Therefore, our results introduce the serpentine mineral as an attractive low-cost candidate in 2D materials applications.
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Publicações de Livros do Departamento de Física

Mazzoni M, Matos M. Minas, Bahia & Poesia. 1st ed. Belo Horizonte: Clube de Autores; 2025. Publisher's VersionAbstract

Há poemas que falam do que se sente, do tempo e da perda. E há outros que falam do instante — esse breve espaço em que o sentimento e o tempo se tocam e se desfazem. Em Minas, Bahia & Poesia, Mário Mazzoni e Matheus Matos recolhem esses instantes. Suas palavras escorrem pela clepsidra partida, misturando o efêmero e o eterno, a leveza e o peso da existência, a ternura e a ausência dos amores. Cada poema é um fragmento de tempo quebrado — uma pausa entre o que já se foi e o que ainda pulsa, entre o silêncio e o que mantém o poema vivo. Aqui, o cotidiano ganha densidade poética: o gato na janela, as chuvas de março, as serras de Minas e a terra vermelha da Bahia. Tudo vibra, tudo respira — e tudo passa. Só a poesia fica. Mas se o tempo é o carrasco das certezas, é também o espaço onde os poetas reencontram o sentido de existir. Entre espelhos, reflexos e silêncios, Minas, Bahia & Poesia é um livro sobre o que o tempo não apaga: o gesto de sentir.

 

Sobre os autores: Mário S. C. Mazzoni nasceu em Belo Horizonte, Minas Gerais. É físico e professor da UFMG e do Programa de Pós-Graduação em Física de Materiais da UFOP. Pesquisador na área de Física da Matéria Condensada, publica aqui seu primeiro livro em coautoria. Matheus J. S. Matos nasceu em Aracaju, Sergipe, e cresceu em Irecê -BA, terra que o habita ainda hoje. Físico e professor da UFOP, encontra na poesia um modo de atravessar o tempo e transformá-lo em palavra. Minas, Bahia & Poesia é também o registro dessa travessia.

Julho 2026

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