A green and fast microwave-assisted synthesis of selenium nanoparticles and their characterization under gastrointestinal conditions using mass spectrometry

The microwave-assisted synthesis of silica nanoparticles and their applications in a soy plant culture

“…38–41 The time and power parameters, programmed for the synthesis processes employing MW irradiation, are those of most significant importance in various studies for the application of this heating method. 26–28,42–44 The behavior of the system as a whole, is dependent on thermal and non-thermal effects that may arise from interactions of the reaction medium with microwaves leading to the modifications that are responsible for the formation of SiO 2 -NPs. 26–28,44 As reported by Peres et al (2018) 44 chemical bonds are not formed or destroyed for the formation of these NPs from the application of MW, which justifies the formation of materials with characteristics similar to those produced in a conventional way.…”

“…26–28,42–44 The behavior of the system as a whole, is dependent on thermal and non-thermal effects that may arise from interactions of the reaction medium with microwaves leading to the modifications that are responsible for the formation of SiO 2 -NPs. 26–28,44 As reported by Peres et al (2018) 44 chemical bonds are not formed or destroyed for the formation of these NPs from the application of MW, which justifies the formation of materials with characteristics similar to those produced in a conventional way. Thus, the DLS and ξ -potential of SiO 2 -NPs were analyzed and compared for both synthesis processes.…”

“…without the addition of SiO 2 precursor. Thus, silica ions can be regrouped to the seed particles, with subsequent stabilization of these 1 0 -400 W @ 5 min 400-700 W @ 15 min 700-400 W @ 10 min 400-0 W @ 20 min -2 0 -400 W @ 5 min 400-700 W @ 15 min 700-400 W @ 10 min 400-200 W @ 10 min 200-0 W @ 10 min 3 0 -400 W @ 5 min 400-700 W @ 15 min 700-400 W @ 10 min 400-200 W @ 5 min 200-0 W @ 15 min 4 0 -400 W @ 5 min 400-700 W @ 15 min 700-400 W @ 5 min 400-200 W @ 5 min 200-0 W @ 20 min 27 From this visual parameter, it became possible to proceed with the other characterizations. Thus, four methods presented in Table 1 were developed and characterized.…”

“…[26][27][28][42][43][44] The behavior of the system as a whole, is dependent on thermal and non-thermal effects that may arise from interactions of the reaction medium with microwaves leading to the modications that are responsible for the formation of SiO 2 -NPs. [26][27][28]44 As reported by Peres et al…”

“…25 In this sense, fast and efficient synthesis methods, like microwave irradiation, show promise to produce more suitable SiO 2 -NPs with desirable characteristics in terms of size distribution, morphology, and stability, which directly inuence their physical, chemical, electrical, and catalytic properties and their toxicity. [26][27][28] Their structural properties include large surface areas and pore diameters from 2 up to 50 nm, being produced using aqueous synthesis methods based on conductive heating, during which the aggregation or possible degradation of SiO 2 -NPs is undesirable and requires considerable attention.…”