Light-stimulated cargo release from a core–shell structured nanocomposite for site-specific delivery

Anchoring of Cu (II)‐Schiff base complex on magnetic mesoporous silica nanoparticles: catalytic efficacy in one‐pot synthesis of 5‐substituted‐1H‐tetrazoles, antibacterial activity evaluation and immobilization of α‐amylase

“…The crystalline structures of the Fe 3 O 4 , Fe 3 O 4 @ MCM‐41, Fe 3 O 4 @MCM‐41‐SB and Fe 3 O 4 @MCM‐41‐SB‐Cu were investigated by XRD (Figures and ). The XRD pattern of the Fe 3 O 4 nanoparticles (Figure ) include peaks at 2 θ = 30.50°, 35.87°,43.51°, 53.88°, 57.43°, 63.00° and 74.55° which are assigned to the (2 2 0), (3 1 1), (4 0 0), (4 2 2), (5 1 1), (4 4 0) and (5 3 3) phases of Fe 3 O 4 , respectively, and agrees with the crystalline cubic spinel structure of standard Fe 3 O 4 nanoparticles . The diffraction peaks appearing in the XRD patterns of Fe 3 O 4 @MCM‐41, Fe 3 O 4 @MCM‐41‐SB and Fe 3 O 4 @MCM‐41‐SB‐Cu (Figure ), suggest that the crystallinity has been preserved during the immobilization process.…”

“…The EDX pattern and mapping analysis of Fe 3 O 4 @MCM-41-SB-Cu are shown in Figures 4 and 5, respectively. This analysis shows the presence of Fe, Si, Cu, N, C, and O in the structure of the nanocomposite, therefore confirms the functionalization of the [51][52][53] The diffraction peaks appearing in the XRD patterns of Fe 3 O 4 @MCM-41, Fe 3 O 4 @MCM-41-SB and Fe 3 O 4 @ MCM-41-SB-Cu (Figure 5), suggest that the crystallinity has been preserved during the immobilization process. Also, the XRD pattern of the Fe 3 O 4 @MCM-41-SB-Cu nanocatalyst (Figure 6) shows the new peaks at 2θ = 66.40 and 72.36 which are attributed to the different copper phases of Cu(331) and Cu(220), respectively.…”

“…The low‐angle XRD patterns of the Fe 3 O 4 @ MCM‐41 and Fe 3 O 4 @MCM‐41‐SB‐Cu were also investigated as depicted in Figure . The XRD pattern of the Fe 3 O 4 @ MCM‐41 shows an intense peak at 2θ = 2.13 and two weak peaks at 2θ = 3.54 and 4.35°, corresponding to the (1 0 0), (1 1 0) and (2 0 0) planes, respectively, which are characteristic of a hexagonal pore system . Fe 3 O 4 @MCM‐41‐SB‐Cu gives only one broad peak at low angle corresponding to (1 0 0) plane.…”

“…The XRD pattern of the Fe 3 O 4 @ MCM-41 shows an intense peak at 2θ = 2.13 and two weak peaks at 2θ = 3.54 and 4.35 , corresponding to the (1 0 0), (1 1 0) and (2 0 0) planes, respectively, which are characteristic of a hexagonal pore system. [52,53,[56][57][58][59][60] Fe 3 O 4 @MCM-41-SB-Cu gives only one broad peak at low angle corresponding to (1 0 0) plane. This broadening and disappearing of XRD peaks are due to functionalization that reduces the order of mesostructure.…”

Construction of site-specific core–shell structured nanocomposite for pH-controlled drug delivery

“…All of the three composites have a type-IV isotherm according to literature [23,24], this confirms all of them contain mesostructure in the outer shell [21,22]. For MCM-41@Fe 3 O 4 , surface area, pore volume and pore diameter are 677.9 m 2 g -1 , 0.461 cm 3 g -1 and 2.80 nm, respectively, which are close to literature values [23][24][25].…”