Magnetoelastic sensors with hybrid films for bacteria detection in milk

Obtainment and Characterization of a Silicon alkoxides-based Coating Applied to a Substrate of Stainless Steel 316L for Use in Biomaterials

“…Figure 4 presents the micrographs of the transversal section of the studied samples. Samples 316L_1 and 316L_2 24 affirms in their study with precursors of TEOS and MAP that the thickness of a film layer composed of alkoxide precursors depends on the structure, chemical composition and the nature of the precursor. According to the authors, the bis-silane (like MAP) lead to the formation of thicker and more homogeneous layers, besides having high capacity in the formation of Me─O─Si bonds (Me=metal).…”

“…A heterogenous morphology can be observed, with the formation of occasional accumulations that might have occurred during the condensation reaction of the film due to the precipitation of clusters with higher concentration of silicon (Si). According to Beltrami et al (2016) 24 , the quantity of these accumulations is crucial for the corrosion resistance of the film. They will probably form the defects of the layer through which the electrolyte will permeate.…”

Magnetoelastic Humidity Sensors with TiO2 Nanotube Sensing Layers

“…Magnetoelastic sensor platforms have been used for chemical and physical detection, including liquid density and viscosity [8][9][10][11][12][13][14], pH [15,16], humidity and temperature [17][18][19][20][21], and mass [22,23]. Recently, the detection of chemical gas sensors and biosensors have been developed [24][25][26][27][28][29][30][31][32][33][34]. For these kinds of detection, the immobilization of a selective and specific functional layer covering the magnetoelastic platform for binding of a target analyte has been found necessary.…”

“…For these kinds of detection, the immobilization of a selective and specific functional layer covering the magnetoelastic platform for binding of a target analyte has been found necessary. Several sensors have been reported for different molecule detection [31][32][33][34]. In the case of biological detection, research is usually focused on bacteria detection, for example, E. coli [32] and Salmonella enterica typhimurium [33,34].…”

Torsional oscillation monitoring by means of a magnetoelastic resonator: modeling and experimental functionalization to measure viscosity of liquids

“…The property of magnetoelastic amorphous ribbons and wires to change the frequency of electric and/or mechanical resonance as a function of several external parameters (i.e., local magnetic field, tensile stress, temperature, pressure, external loads, damping factors) has been largely employed for measuring static or dynamic strain [1][2][3][4], low intensity magnetic field [5], fluid viscosity [6,7], with several applications in industrial engineering [8,9] and bio-medicine [10][11][12]. In particular, although many alternative techniques are developing for viscosity measurements [13][14][15], the interest for more reliable and sensitive devices based on magnetoelastic resonance of metallic glass cores is currently alive and fueled by continuous improvements in material treatment [16], device technology [16,17] and measurement methodology itself [18].…”