João Paulo Barros Machado
National Institute for Space Research
Simulated body fluidAnalytical chemistryCubic zirconiaCeramicNuclear chemistryComposite materialFlexural strengthChemistryMetallurgyMaterials scienceScanning electron microscopeBiocompatibilitySinteringAlloyCoatingFerrite (magnet)Chemical engineeringTitaniumContact angleMicrostructureTitanium alloyFracture toughness
81Publications
14H-index
870Citations
Publications 80
Newest
Background: Several studies proved that anodic oxidation improves osseointegration. This study aimed to optimize osseointegration through anodization in dental implants, obtaining anatase phase and controlled nanotopography. Methods: The division of the groups with 60 titanium implants was: control (CG); sandblasted (SG); anodized (AG): anodized pulsed current (duty cycle 30%, 30 V, 0.2 A and 1000 Hz). Before surgery, surface characterization was performed using Atomic Force Microscopy (AFM), Sc...
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#1Mayara dos Santos Amarante (ITA: Instituto Tecnológico de Aeronáutica)H-Index: 1
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Abstract Particulate magnetoelectric ceramic composites (PMCC) have received much attention since the last decade. These composites have many technological applications and are usually composed by magnetostrictive and piezoelectric phases. Cobalt-based spinel ferrites are among the most studied magnetostrictive phases for ferrite-based PMCCs and BaTiO3 is an interesting choice for the piezoelectric phase because it is a lead-free ceramic, unlike the traditional PZT. In this work, cobalt ferrite ...
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#1Tabata P. Sato (UNESP: Sao Paulo State University)
#1Tabata Prado Sato (UNESP: Sao Paulo State University)H-Index: 2
Last. Alexandre Secorun Borges (UNESP: Sao Paulo State University)H-Index: 19
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OBJECTIVES This study aimed to evaluate the effects of nanohydroxyapatite (nHAp) particles on the morphological, chemical, physical, and biological properties of chitosan electrospun nanofibers. MATERIALS AND METHODS nHAp particles with a 1.67 Ca/P ratio were synthesized via the aqueous precipitation method, incorporated into chitosan polymer solution (0.5 wt%), and electrospun into nHAp-loaded fibers (ChHa fibers). Neat chitosan fibers (nHAp-free, Ch fibers) were used as the control. The electr...
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#1Nayara Koba de Moura (UNIFESP: Federal University of São Paulo)H-Index: 4
#2Eduardo Ferreira Martins (UNIFESP: Federal University of São Paulo)H-Index: 1
Last. Eliandra de Sousa Trichês (UNIFESP: Federal University of São Paulo)H-Index: 7
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Abstract Polymer membranes have been widely used in guided bone regeneration (GBR), especially when it comes to their use in dentistry. Poly (lactic acid) (PLA) have good mechanical properties such as flexibility, which allows the material to be moldable and also has biocompatibility and biodegradation. Besides that, bioglass (BG) incorporated into the polymer matrix can promote osteoinduction properties and osteoconduction properties to the polymer-ceramic biocomposite. The membranes are also r...
4 CitationsSource
#1Idalia A. W. B. Siqueira (UNIFESP: Federal University of São Paulo)H-Index: 6
#2Suelen Simões Amaral (USP: University of São Paulo)H-Index: 2
Last. Eliandra de Sousa Trichês (UNIFESP: Federal University of São Paulo)H-Index: 7
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A new approach in dentistry is based on the development of resorbable polymeric membranes for guided bone regeneration. The porous membrane surface promotes better cell adhesion and proliferation. Poly(lactic acid) (PLA) is one of most widely used polymers for several biological applications, with the advantage of presenting hydrolysis degradation and bioresorption of its products. In this work, PLA porous polymeric membranes containing calcium silicate (CaSiO3) fibers were prepared by controlle...
5 CitationsSource
#1Preksha N. Dhruv (Gujarat University)H-Index: 6
#2Sher Singh Meena (BARC: Bhabha Atomic Research Centre)H-Index: 30
Last. C.B. Basak (HBNI: Homi Bhabha National Institute)H-Index: 15
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Abstract Gallium substituted Z-type hexagonal ferrites with chemical composition Sr3Co2-xGaxFe24O41 (x = 0.0,0.4, 0.8, 1.2, 1.6, and 2.0) were successfully synthesised in air at 1200 °C for 5 h using the sol-gel auto-combustion technique, in order to investigate the effect of gallium substitution on structural, magnetic and dielectric properties. X-ray Diffraction (XRD) analysis of all samples reveals the formation of mixed hexaferrite phases, with Z ferrite as the major phase (72–90%).The avera...
10 CitationsSource
#1Aline Chiodi Borges (UNESP: Sao Paulo State University)H-Index: 7
#2Thalita Mayumi Castaldelli Nishime (Leibniz Association)H-Index: 8
Last. Cristiane Yumi Koga-ItoH-Index: 25
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This study aimed to evaluate the effects of cold atmospheric pressure plasma (CAPP) jet on Trichophyton rubrum growth, germination and adherence to nail. The effects of plasma jet on T. rubrum conidia germination and on mycelial growth were evaluated by in vitro assays. An ex vivo nail infection model was used to evaluate the effects on conidia adherence and infection. Biochemical analyses of nail fragments exposed or not to CAPP were performed by attenuated total reflectance–Fourier transform i...
5 CitationsSource
#1Simone de Souza Pinto (Metropolitan University)H-Index: 1
#1Simone de Souza Pinto (Metropolitan University)H-Index: 5
Last. Mirabel Cerqueira Rezende (UNIFESP: Federal University of São Paulo)H-Index: 34
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Abstract This study deals with different magnetic additives based on ferrites (MnZn, LaCa (Co and Ti)), carbonyl iron (CI), and iron filaments (IF) formulated in epoxy resin. Morphological and structural characteristics of the additives were evaluated. Based on these additives samples with both different thickness and weight fractions (1-70 wt%) were prepared. The formulated composites were analyzed considering different electromagnetic characteristics: reflectivity, shielding effectiveness, the...
8 CitationsSource
Last. Fabio Roberto PassadorH-Index: 15
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Polymer membranes have been widely used in guided tissue regeneration (GTR) and guided bone regeneration (GBR). The literature recognizes that poly (lactic acid) (PLA)/poly (e-caprolactone) (PCL) blends have better physicochemical properties and that a porous polymer surface facilitates cell adhesion and proliferation. In addition, hydroxyapatite (HAp) incorporated into the polymer matrix promotes osteoinduction properties and osteoconduction to the polymer-ceramic biocomposite. Therefore, polym...
6 CitationsSource
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1 CitationsSource