A general and mild route to highly dispersible anisotropic magnetic colloids for sensing weak magnetic fields

Abstract

A porous-silica-protected conversion method is developed to prepare highly dispersible anisotropic magnetic colloids.

Cobalt Plasmonic Superstructures Enable Almost 100% Broadband Photon Efficient CO2 Photocatalysis

“…It was found that the silica shell plays a vital role in the preparation of the Co‐PS@SiO 2 catalyst. First, it functioned as the protection layer to preserve the overall nanoarray structure during the conversion of Co(OH) y (CO 3 ) 0.5(2− y ) · n H 2 O into metallic Co. [ 12 ] In the absence of the silica shell, the nanoarray structure was fully collapsed after annealing (Figure S11, Supporting Information). Moreover, the silica shell provided the confined environment to limit the growth of Co nanocrystals.…”

“…Moreover, the silica shell provided the confined environment to limit the growth of Co nanocrystals. [ 12 ] This is evidenced from the increased Co grain size of 47 nm in Co/FTO (Figure S12, Supporting Information).…”

Two‐Dimensional Silicon for (Photo)Catalysis

“… [10a,64] The Si–O–Si groups are usually inert in chemical reactions unless the defects are generated (e.g., ≡Si· and ≡SiO·), which were demonstrated to be active in methanation of CO 2 (Figure 7a). [64c] The hydrophilic Si–OH groups can make 2D Si well dispersed in water, benefiting photocatalytic reactions in aqueous solutions [64a,66] . Moreover, the active –OH groups could crosslink with many kinds of surfactants and functional groups so that 2D Si could be modified with abundant useful ligands (e.g., –NH 2 and –SH) as required.…”

Anomalous effect of the aging degree on the ionic permeability of silica shells

“…Stöber method has been proven as an effective route to coat nanoparticles with silica shells. 40,41 The sol-gel process involves the hydrolysis and condensation of a silane precursor (e.g. tetraethyl orthosilicate).…”