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Chiara Valsecchi

Universidade Federal do Pampa

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J. W. Menezes

Universidade Federal do Pampa

Luis E. G. Armas

Universidade Federal do Pampa

Meikun Fan

Southwest Jiaotong University

Alexandre G. Brolo

University of Victoria

Hubert Stassen

Universidade Federal do Rio Grande do Sul

Marcileia Zanatta

Universitat Jaume I

Francisco P. dos Santos

Universidade Federal do Rio Grande do Sul

Graciane Marin

Universidade Federal do Rio Grande do Sul

Jaı̈rton Dupont

Universidade Federal do Rio Grande do Sul

Jaderson L. S. Gonçalves

Universidade Federal do Pampa

Cooperative Institutions

Universidade Federal do Pampa

Universidade Federal do Rio Grande do Sul

Universidade de São Paulo

Universidade Estadual de Campinas (UNICAMP)

Centre National de la Recherche Scientifique

Universidade Estadual de Maringá

Universidade Federal de Santa Maria

National University of Engineering

University of Rio Grande and Rio Grande Community College

Sichuan University

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Confined water in imidazolium based ionic liquids: a supramolecular guest@host complex case

Physical Chemistry Chemical Physics (2016)

Marcileia Zanatta Anne‐Lise Girard Graciane Marin Günter Ebeling Francisco P. dos Santos

Traces of water in some ionic liquids can be regarded as a guest@host supramolecular structure even when diluted in solvents with high dielectric constants.

10.1039/c6cp03112a

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Citations (41)

Leukemic marker detection using a spectro-polarimetric surface plasmon resonance platform

Biosensors and Bioelectronics (2014)

Mathieu Maisonneuve Chiara Valsecchi Chen Wang Alexandre G. Brolo Michel Meunier

Kappa

10.1016/j.bios.2014.06.018

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Citations (20)

Entomotoxic activity of Rhinella icterica (Spix, 1824) toad skin secretion in Nauphoeta cinerea cockroaches: An octopamine-like modulation

Pesticide Biochemistry and Physiology (2018)

Allan Pinto Leal Raquel Soares Oliveira Ana Paula A. Perin Bruna Trindade Borges Patrícia de Brum Vieira

10.1016/j.pestbp.2018.04.016

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Citations (13)

Improving the performance of gold nanohole array biosensors by controlling the optical collimation conditions

Applied Optics (2015)

J. W. Menezes Anderson Thesing Chiara Valsecchi Luis E. G. Armas Alexandre G. Brolo

An experimental investigation on how the bulk and surface sensitivities of gold nanohole arrays fabricated by interference lithography affect the degree of white light beam collimation is presented. The optical transmission response of nanohole arrays has been recorded by focused and collimated beam transmission spectra. The results show that both the bulk and surface sensitivities for the collimated case are much larger than for the focused case. In particular, the shape of the spectra was dependent on the degree of beam collimation. The results showed that improved sensing performance (around 3.5 times) and higher figure of merit (around 4.4 times) can be obtained by simply adjusting the incident/collection experimental conditions in transmission measurements.

Collimated light

Figure of Merit

Beam expander

Extraordinary optical transmission

10.1364/ao.54.006502

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Citations (22)

Large Area Nanohole Arrays for Sensing Fabricated by Interference Lithography

Chiara Valsecchi Luis E. G. Armas J. W. Menezes

Several fabrication techniques are recently used to produce a nanopattern for sensing, as focused ion beam milling (FIB), e-beam lithography (EBL), nanoimprinting, and soft lithography. Here, interference lithography is explored for the fabrication of large area nanohole arrays in metal films as an efficient, flexible, and scalable production method. The transmission spectra in air of the 1 cm2 substrate were evaluated to study the substrate behavior when hole-size, periodicity, and film thickness are varied, in order to elucidate the best sample for the most effective sensing performance. The efficiency of the nanohole array was tested for bulk sensing and compared with other platforms found in the literature. The sensitivity of ~1000 nm/RIU, achieved with an array periodicity in the visible range, exceeds near infrared (NIR) performances previously reported, and demonstrates that interference lithography is one of the best alternative to other expensive and time-consuming nanofabrication methods.

Interference lithography

Nanosphere lithography

Next-generation lithography

Maskless lithography

10.3390/s19092182

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Citations (27)

Highly Sensitive Surface-Enhanced Raman Scattering Detection of Hydroxyl Radicals in Water Microdroplets Using Phthalhydrazide/Ag Nanoparticles Nanosensor

Environmental Science & Technology (2024)

Shengmao Chao Chiara Valsecchi Ji Sun Hong Shao Xinxia Li

The spontaneous generation of hydrogen peroxide (H2O2) within atmospheric microdroplets, such as raindrops and aerosols, plays a crucial role in various environmental processes including pollutant degradation and oxidative stress. However, quantifying hydroxyl radicals (•OH), essential for H2O2 formation, remains challenging due to their short lifespan and low concentration. This study addresses this gap by presenting a highly sensitive and selective surface-enhanced Raman scattering (SERS) nanosensor specifically designed for quantifying •OH within water microdroplets. Utilizing a phthalhydrazide (Phth) probe, the SERS technique enables rapid, interference-free detection of •OH at nanomolar concentrations. It achieves a linear detection range from 2 nM to 2 μM and a limit of detection as low as 0.34 nM. Importantly, the SERS sensor demonstrates robustness and accuracy within water microdroplets, paving the way for comprehensive mechanistic studies of H2O2 generation in the atmosphere. This innovative approach not only offers a powerful tool for environmental research but also holds potential for advancing our understanding of atmospheric H2O2 formation and its impact on air quality and pollutant degradation.

Nanosensor

10.1021/acs.est.4c03081

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Citations (5)

Road Marking Glass Microspheres Fabricated from Rice Husk Ash

Materials Research (2023)

J. Pase Neto I. M. Teixeira Luis E. G. Armas Chiara Valsecchi J. W. Menezes

In this work, it is reported a comparison between solid microspheres produced from glass having conventional industrial sand (IS) and glasses made with rice husk ashes (RHA) as a source of silica. The same composition was used to fabricate both glasses. The focused was the production of glass microspheres for road horizontal marking, which would attend the type classification called Premix. The microspheres were obtained by the horizontal flame method. The results showed that characteristics such as production yield, morphology, granulometry and, mainly, retroreflectivity measurements are not altered when rice husk ash is present in the glass composition, showing that this can be a sustainable alternative material for this important application.

Husk

Glass Production

Glass microsphere

Granulometry

10.1590/1980-5373-mr-2022-0546

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Citations (1)

Synthesis and Raman characterization of wood sawdust ash, and wood sawdust ash-derived graphene

Diamond and Related Materials (2021)

Lisiane S. Severo Juliana Bürger Rodrigues DIONATHAN ALVES CAMPANELLI V. Pereira J. W. Menezes

Sawdust

Potassium hydroxide

10.1016/j.diamond.2021.108496

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Citations (19)

Multifunctional 3D magnetic carbon aerogel for adsorption separation and highly sensitive SERS detection of malachite green

Chemosphere (2023)

Xueqing Wang Xing Liu Fan Li Chiara Valsecchi Zhangmei Hu

Malachite green

Magnetic separation

Carbon fibers

10.1016/j.chemosphere.2023.139654

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Citations (6)

ANALYSIS OF STRENGTH OF BRITTLE MATERIALS UNDER DIFFERENT STRAIN RATES USING LDEM SIMULATIONS

Revista Sul-americana de Engenharia Estrutural (2020)

Carla Driely Morsch Vidal Guilherme Schumacher da Silva Chiara Valsecchi Luís Eduardo Kosteski

This paper presents a study on the variation of strain rate influence with the scale effect in quasi-brittle materials. Works in the literature report an increase of dynamic resistance with strain rate. To study this relation, a numerical model that combines the Finite Element Method and the Lattice Discrete Element Method is employed. This mixed model was implemented on the commercial software Abaqus/Explicit. The samples are prepared with FEM at the extremity and LDEM for the central part, which has a reduction in the cross-section, so the rupture occurs in the middle. In the simulations, four model specimens with dimensional variations were subjected to direct tensile testing with different strain rates. The results showed that with the increase of applied strain rate, the resistances also increase and the body dimension influences this behavior. The variation of the tensile strength is found without modifications on the elemental constitutive relationship or material parameters. At last, a method that could lead to an independent relationship between the dynamic intensification and the stain rate of scale effect is also proposed.

Brittleness

Strain (injury)

Tensile testing

10.5335/rsaee.v17i1.10043

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Citations (1)