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Akademický článek

Self-organized nickel nanoparticles on nanostructured silicon substrate intermediated by a titanium oxynitride (TiNxOy) interface

Autor: M. Morales, R. Droppa Jr., S. R. S. de Mello, C. A. Figueroa, A. R. Zanatta, F. Alvarez

Publikováno v: AIP Advances, Vol 8, Iss 1, Pp 015025-015025-15 (2018)

In this work we report an experimental approach by combining in situ sequential top-down and bottom-up processes to induce the organization of nanosized nickel particles. The top-down process consists in xenon ion bombardment of a crystalline silicon

Externí odkaz: https://doaj.org/article/ceddd7bdf0814a759bfa374dda0287a7

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Effect of Milling Parameters on the Stability of the Passive Film of AISI 304 Stainless Steel

Autor: Rafael dos Santos Pereira, Mara Cristina Lopes de Oliveira, R. Droppa, Renato Altobelli Antunes

Publikováno v: Journal of Materials Engineering and Performance. 30:8131-8144

AISI 304 stainless steel samples were milled with different feed rates and depths of cut. The effect of the milling parameters on the surface residual stresses was assessed by x-ray diffraction. The chemical composition of the passive film was examin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::073e9cfc43b160041e38019dd5c97b70
https://doi.org/10.1007/s11665-021-06064-w

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Water vapor diffusive transport in a smectite clay:Cationic control of normal versus anomalous diffusion

Autor: Henrik Hemmen, Éverton Carvalho dos Santos, Leander Michels, Yves Méheust, Jon Otto Fossum, Mário Alberto Simonato Altoé, Geraldo José da Silva, R. Droppa

Publikováno v: Michels, L, Meheust, Y, Altoe, M A S, dos Santos, E C, Hemmen, H, Droppa Jr, R, Fossum, J O & da Silva, G J 2019, ' Water vapor diffusive transport in a smectite clay : Cationic control of normal versus anomalous diffusion ', Physical Review E, vol. 99, no. 1, 013102 . https://doi.org/10.1103/PhysRevE.99.013102
Physical Review E
Physical Review E, American Physical Society (APS), 2019, 99 (1), pp.013102. ⟨10.1103/PhysRevE.99.013102⟩
Physical Review E, 2019, 99 (1), pp.013102. ⟨10.1103/PhysRevE.99.013102⟩

International audience; The transport of chemical species in porous media is ubiquitous in subsurface processes, including contaminant transport, soil drying, and soil remediation. We study vapor transport in a multiscale porosity material, a smectit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5f7c68be4034daa3e7eab7fd2beddd1
https://curis.ku.dk/ws/files/247116433/PhysRevE.99.013102.pdf

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Effect of ion peening and pulsed plasma nitriding on the structural properties of TiN coatings sputtered onto 100Cr6 steel

Autor: S. Vales, Pedro Renato Tavares Avila, Haroldo Cavalcanti Pinto, A. Rosenkranz, Fernando Alvarez, José Garcia, Flavio Soldera, R. Droppa

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Ion peening with noble gas is typically used to generate lattice imperfections and a nanostructure within the bombarded metal surfaces. This might have therefore an impact on subsequent plasma nitriding, thus allowing for enhancing the adhesion and w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10d26ebf4f45675c5ec3c94183330af2

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Akademický článek

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Properties of aluminum oxide thin film obtained by metal plasma immersion ion implantation and deposition after zirconium-based pretreatment

Autor: Maria Cecília Barbosa da Silveira Salvadori, Lara Basilio Tavares, Renato Altobelli Antunes, R. Droppa, Demetrio Jackson dos Santos, Tiago Fiorini da Silva

Publikováno v: Vacuum. 121:32-41

Aluminum oxide thin films were obtained by metal plasma immersion ion implantation and deposition (MePIIID) and subsequently converted by a zirconium based surface pretreatment. Thin films atomic composition was studied using Rutherford backscatterin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f617c866577f02b0018cbc9859b57c2c
https://doi.org/10.1016/j.vacuum.2015.07.016

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Cation exchange dynamics confined in a synthetic clay mineral

Autor: C. L. S. da Fonseca, Azarmidokht Gholamipour-Shirazi, R. Droppa, G.J. da Silva, Zbigniew Rozynek, G. Grassi, Jon Otto Fossum, E. C. dos Santos, Mário Alberto Simonato Altoé, Leander Michels

Publikováno v: The European Physical Journal Special Topics. 223:1883-1893

In this work we report X-Ray Diffraction (XRD) and Energy Dispersive X-Ray Spectroscopy (EDS) measurements to investigate the confined cation exchange process in saline aqueous suspensions of a synthetic clay mineral from Lithium-Fluorohectorite to N

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8912675f6b94ae7138cfa59c80498f6a
https://doi.org/10.1140/epjst/e2014-02233-8

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Influence of Xe Ion-Bombardment on the Substrate Microstructure and the Residual Stresses of Tin Coatings Deposited by Plasma Reactive Sputtering onto AISI 4140 Steel

Autor: R. Droppa, Thaís Helena Carvalho Miranda, Erika Abigail Ochoa Becerra, Sandra Vales, Haroldo Cavalcanti Pinto, José Garcia, Fernando Alvarez, Pedro Paiva Brito

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

The seek for sustainability in the global economic scenario has led to the need for developing materials that provide higher productivity, greater speed of operation, extended lifetimes and enhanced surface finishing of engineering parts. To achieve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30a1b60241441898b7c2be0959178d2d
https://doi.org/10.4028/www.scientific.net/amr.996.841

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Akademický článek

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Continuous water adsorption states promoted by Ni2+ confined in a synthetic smectite

Autor: Giovanni Grassi, Jon Otto Fossum, Éverton Carvalho dos Santos, Leander Michels, Heloisa N. Bordallo, Geraldo José da Silva, Mário Alberto Simonato Altoé, Luciano Ribeiro, Kenneth D. Knudsen, R. Droppa

Publikováno v: Applied Clay Science

The water adsorption isotherms of Ni-fluorohectorite have been obtained from the relative humidity dependence of X-ray diffraction intensities, and continuous transitions between the stable hydration states were observed. This behavior is significant

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6316ffd7da1d79a2b0917b6e9945a8db
https://hdl.handle.net/11250/2468026

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