Porous nanoclay polysulfone composites: A backbone with high pore accessibility for functional modifications

Red‐ and green‐emitting nano‐clay materials doped with Eu3+ and/or Tb3+

“…It is well known that clay minerals, especially the smectite types, show an ease for ion exchange in the interlayer space . Thus, the doping was carried out through a simple cation exchange of three Na + for one Eu 3+ and/or Tb 3+ in the interlayer space (Figure ).…”

“…show an ease for ion exchange in the interlayer space. [10,19] Thus, the doping was carried out through a simple cation exchange of three Na + for one Eu 3+ and/or Tb 3+ in the interlayer space (Figure 1). The XPD patterns of the doped materials ( Figure 2) indicate that no crystalline impurities were generated from the doping, however the LS(Cl) and Tb 3+ (0.92 Å) [60,61] and since the doping concentration was low.…”

“…For this reason, in the current work the host lattices were produced based on the hectorite structure but, replacing the OH − ions with Cl − or F − ions, thus producing the fluorohectorite and chlorohectorite clays (hereafter, referred as LS(X) materials, where X = Cl or F). These materials allow the doping using a cation exchange reaction in the interlayer space (Figure ), which is easily induced by using a colloidal solution of the clay materials …”

“…[1] In general, clay minerals are used as host lattices for inorganic and organic species [7,8] because they represent a low-cost and abundant class of materials with unique features such as high adsorption, capability of ion-exchange in the interlayer space, potential for intercalation with species in variable sizes, and easy tunneling of optically active species. [9][10][11] Among the vast class of clay minerals hectorite is one of the most explored synthetic clays due to its easy synthesis at low temperatures and pressures. [12] The hectorite is a smectite type of clay mineral which has a T:O:T structure formed by two polymeric sheets of corner-sharing (Figure 1).…”

“…These materials allow the doping using a cation exchange reaction in the interlayer space (Figure 1), which is easily induced by using a colloidal solution of the clay materials. [10,19] Previously, several luminescent materials have been reported as being produced through the doping of clay minerals with Eu 3+ or Tb 3+ . [7,11,[20][21][22][23][24][25][26][27][28][29][30][31] However, only few works included a cation exchange reaction to achieve the doping.…”