Oportunidades - Programa de Química

Dra. Liane Marcia Rossi

E-mail: lrossi@iq.usp.br

Projeto: “MOFs para agrotecnologia: captura de CO2 e entrega de nutrientes”

Objetivos: O objetivo principal deste projeto é a síntese de nanominerais porosos customizados, conhecidos como Metal Organic Frameworks (MOFs), inspirados na geoquímica e tipologia de argilas do solo para melhorar as funções ecossistêmicas do mesmo e o sequestro de carbono, visando auxiliar a resiliência do solo à eventos climáticos externos, melhorando a performance agrícola e ambiental.

O bolsista irá atuar em um grupo interdisciplinar sendo responsável pelo desenvolvimento de metodologias de inteligência artificial aplicadas ao design de materiais e suas aplicações.

Projeto com Bolsa FUSP - modalidade doutorado 36 meses

Interessados favor entrar em contato com a Profa. Liane para maiores detalhes.

Dr. Paulo de Oliveira

Oportunidade Bolsa de Mestrado

O grupo do Dr. Paulo de Oliveira no Instituto de Química da Universidade de São Paulo IQ/USP recebe inscrições de candidatos para bolsa de mestrado FAPESP no seguinte tema “Síntese mecanoquímica de nanopartículas metálicas a partir de seus sais precursores”. O projeto visa o controle da síntese e das propriedades finais das nanopartículas através dos parâmetros de síntese via ação mecânica e em estado sólido. Mais informações sobre nossa pesquisa podem ser encontradas em paulodeoliveira-lab.weebly.com e em nossas publicações recentes. O projeto faz parte de um Auxílio a Jovens Pesquisadores da FAPESP e conta com colaboradores nacionais e internacionais.

Para candidatura, os interessados devem enviar e-mail com CV e histórico escolar para o e-mail: paulofmo@usp.br. No assunto especificar “Candidatura Mestrado – Nome + Sobrenome”

Valor da Bolsa: 1º ano – R$ R$ 2.349,60 / 2 º ano – R$ R$ 2.494,20.

Benefícios adicionais para os que não residem na cidade de São Paulo: Auxílio Instalação no valor de uma mensalidade da bolsa e Despesa de Transporte relativo à mudança para a cidade de São Paulo.

Abstract. Metal nanoparticles (NPs) have numerous properties, making them suitable materials for application in catalysis, energy conversion, sensing, and biomedicine. The constant need for a more sustainable chemistry and materials preparation has motivated the research for alternative eco-friendly routes of synthesis. In such context, solid- state mechanochemical means, such as ball milling, have been of great interest. The preparation of metal nanoparticles using milling have been extensively explored from top-down approach. This is, from the comminution and severe plastic deformation of the bulk material. However, top-down approaches are incapable of controlling the nanoparticles’ structure, particularly the morphology. On the other hand, the synthesis of metal nanoparticles from the bottom-up approach, i.e., by the chemical reduction of the metal precursor, enables the construction of the nanostructure by controlling the rate of the chemical reaction, nucleation, and growth of the nanoparticle. The bottom-up mechanochemical synthesis of metal nanoparticles is relatively recent and many challenges remain in controlling the size and morphology of the nanoparticles. There is a lack of studies intending to control the nanoparticle design via mechanochemistry. In this master’s project, a diversity of metal nanoparticles will be prepared using bottom-up mechanochemical approach. Ag, Pd as well as Cu NPs will be synthesized in ball milling devices. The reaction conditions, including the metal precursor, the reducing and the capping agent will be studied. The effect of the milling device – planetary and vibratory mill –, i.e., the type of mechanical energy input, on the size and morphology of the nanoparticles will also be investigated. The material will be characterized using Transmission electron microscopy (TEM), Powder X-ray Diffraction (PXRD) and X-ray photoelectron Spectroscopy (XPS). The use of synchrotron-based techniques is also envisaged for in situ characterizations. This project will enable to understand the effects of the reaction conditions on the nanoparticles structure. Additionally, we expect to unravel the mechanisms of nanoparticles formation using advanced characterization techniques. The relevant materials will be tested in catalytic reactions. This project will be paving the way for the controlled mechanochemical design of advanced active materials for technological ends.

Oportunidade Bolsa de Doutorado Direto

O grupo do Dr. Paulo de Oliveira no Instituto de Química da Universidade de São Paulo IQ/USP recebe inscrições de candidatos para bolsa de doutorado direto FAPESP seguinte tema “Mecanoquímica como ferramenta na preparação de nanomateriais multicomponentes”. O projeto visa o controle da síntese e das propriedades finais dos nanomaterias sem uso de agentes estabilizantes através dos parâmetros de síntese via ação mecânica e em estado sólido. A pesquisa visa associar diferentes propriedades de metais e óxidos para aplicações catalíticas. Defeitos, morfologia e mecanismos de formação serão estudados utilizando-se técnicas de espalhamento e espectroscopia de raios-X disponíveis em infraestruturas síncrotron. Mais informações sobre nossa pesquisa podem ser encontradas em paulodeoliveira-lab.weebly.com e em nossas publicações recentes. O projeto faz parte de um Auxílio a Jovens Pesquisadores da FAPESP e conta com colaboradores nacionais e internacionais.

Para candidatura, os interessados devem enviar e-mail com CV e histórico escolar para o e-mail: paulofmo@usp.br. No assunto especificar “Candidatura DD – Nome + Sobrenome”.

Valor da Bolsa: 1º ano – R$ R$ 2.349,60 / 2 º – R$ R$ 2.494,20 / 3º – R$ R$ 3.462,60 / 4 °– R$ R$ 4.285,50.

Benefícios adicionais para os que não residem na cidade de São Paulo: Auxílio Instalação no valor de uma mensalidade da bolsa e Despesa de Transporte relativo à mudança para a cidade de São Paulo.

Abstract. The interest in design of metal nanoparticles (NPs) continuously increase due to exceptional properties of these nanostructures, which make them suitable for application in catalysis, energy conversion, biomedicine and sensing. Despite the great success in tuning the properties of single metal nanostructures by controlling the nanoparticle architecture (size, shape, etc), they cannot satisfy the requirements necessary for some applications. In catalysis field, for example, an ideal material should be highly active, selective, chemically and structurally stable. Additionally, for industrial purposes the material should also be available at low-cost and at scale. These technological demands can be reached by the association of two or more elements into the final nanostructure. In this context, the synthesis of multimetallic NPs have been explored in order to amplify the range of properties by combining complementary characteristics. Solution-based and thermal-annealing protocols have succeeded in the preparation of multimetallic structures eventually containing two, eventually three elements. Electrochemical and AFM-tip deposition approaches have also been used for inclusion of more than three elements into the structure. These techniques are, however, very sensitive to the reaction conditions, and are either solvent and/or energy intensive. In addition, classical routes still face challenges for the preparation of nanostructures at larger scales. In the recent years, alternative environmentally friendly routes for the preparation of advanced materials have emerged. This is the case of solid-state mechanochemical synthesis, which have been explored as a green alternative for the preparation of metal NPs from the chemical reduction of the metal precursors. Through inherent mechanisms (comminution, forced atomic diffusion, local temperature, etc), the mechanical stress input, mostly by milling, have enabled the generation of multicomponent and metastable materials. This opens a completely new horizon in the preparation of metal NPs, not limited to the mutual miscibility and solubility of the constituting elements. Yet, examples of bottom-up mechanochemical syntheses of bi- or multimetallic systems is extremely limited and remains underexplored. The present project is dedicated to the solid-state mechanochemical synthesis of multimetallic NPs. The association of more than one element will vastly expand the property landscape of the prepared materials, consequently broadening their potential toward technological applications. The metal NPs will be synthetized using the bottom-up approach, by milling the respective metal precursors in appropriate molar ratios. The chemical reduction will take place by the addition of a solid reducing agent. The NPs will be formed by the combination of precious (Au, Ag and Pd) and other catalytically active (Ni, Cu) metals and can consist of up to five alloying elements. The type of the reducing agents (strong/mild) in the formation, elemental composition and distribution in the NPs will be studied as well as the order of the metal precursor addition (one-pot or stepwise synthesis). This will make possible to identify the dominant conditions to a successful control of the physicochemical features of the final nanostructures. The particle size and shape will be studied by TEM techniques. The atomic distribution over the NPs will be evaluated by EDS-STEM. X-ray spectroscopies (XPS and XAS) will be used to probe the local structure and the chemical environment. The crystalline phases will be identified by PXRD, and PDF can be employed to understand the formation of the NPs at the early stage. UV-VIS DRS will also be used when plasmonic metals (Au, Ag and Cu) constitute the nanostructure. In situ studies (XAS, PXRD, PDF) are also envisaged to study the mechanisms of formation of multimettalic NPs under mechanochemical conditions.

 

 

Dr. Roberto M. Torresi

Instituto de Química - USP

Av. Prof. Lineu Prestes, 748 - 05508-000 São Paulo (SP), Brasil

Fone: +55 11 3091-9194 - e-mail: rtorresi@iq.usp.br

Dra. Paola Corio

 

Dr. Thiago Carita Correra

BOLSAS FAPESP DISPONÍVEIS – IQ-USP

DD

N processo: 2021/06726-0

Tipo de bolsa: Doutorado

Área de atuação: Espectrometria de massas, Instrumentação, metabólitos, espectroscopia, eletroquímica

Título do projeto FAPESP: Evaluation of drug metabolites and degradation products by differential ion mobility and infrared ion spectroscopy

Descrição da vaga:

The University of São Paulo is looking for a PhD. Student for the study of polymerization reactions by advanced Mass spectrometry techniques.

Applications are invited for a 4-year fellowship in the group of Prof. Dr. Thiago Correra at the Institute of Chemistry – Molecular Chemistry Physical Laboratory. The candidate will use advanced mass spectrometry techniques, like ion mobility coupled with vibrational ion spectroscopy, for the study of electrochemically generated metabolites and transformation products of relevant drugs. This fellowship also gives the candidate the opportunity to conduct research abroad (BEPE program).

Applicants from any nationality are accepted. Applicants should have a graduation degree or master’s degree in chemistry or related area. Experience with mass spectrometry, electrochemistry and theoretical calculations would be advantageous but are not required. Effective communication skills to help and train junior researchers in the laboratory is a must.

The position is available immediately; The candidate should be eligible for enrollment to the Chemistry Graduation Program - see https://euq.sbq.org.br/index.php for exam dates and other information.

To apply send your CV and a presentation letter to tcorrera@iq.usp.br with subject “DD-metabolites application”. More details on the fellowship may be found at https://fapesp.br/bolsas/dd

 

DD

N processo: 2021/06726-0

Tipo de bolsa: Doutorado

Área de atuação: Espectrometria de massas, Instrumentação, metabólitos, espectroscopia, eletroquímica

Título do projeto FAPESP: Evaluation of polymerization reactions by differential ion mobility and infrared ion spectroscopy

Descrição da vaga:

The University of São Paulo is looking for a PhD. Student for the study of polymerization reactions by advanced Mass spectrometry techniques.

Applications are invited for a 4-year fellowship in the group of Prof. Dr. Thiago Correra at the Institute of Chemistry – Molecular Physical Chemistry Laboratory. The candidate will use advanced mass spectrometry techniques, like ion mobility coupled with vibrational ion spectroscopy, for the study of polymerization motifs on the polybenzoxazine formation and the evaluation of the electropolymerization of aniline. This fellowship also gives the candidate the opportunity to conduct research abroad (BEPE program).

Applicants should have a graduation degree or master’s degree in chemistry or related area. Experience with mass spectrometry, polymerization reactions and theoretical calculations would be advantageous but is not required. Effective communication skills to help and train junior researchers in the laboratory is a must.

The position is available immediately; The candidate should be eligible for enrollment to the Chemistry Graduation Program - see https://euq.sbq.org.br/index.php for exam dates and other information.

To apply send your CV and a presentation letter to tcorrera@iq.usp.br with subject “DD-polimerization application”. More details on the fellowship may be found at https://fapesp.br/bolsas/dd