| Abstract [eng] |
Lanthanide orthophosphates are diverse materials which can be obtained in various crystalline phases, sizes and morphologies. In this thesis, number of different GdPO4 morphologies, such as nanofiber, nanorods, hexagonal nanoprisms and submicrospheres of rhabdophane phase were synthesized via hydrothermal approach. Impact of various synthetical conditions ( /Gd3+ molar ratio, Gd3+ absolute concentration, pH and duration of synthesis) upon particle formation was investigated. Stability study of bare, as-prepared GdPO4 particles indicated that additional stabilization is needed. In order to enhance particle stability and applicability, obtained GdPO4 nano and submicro particles were modified with purposely synthesized cationic p(METAC stat PEO19MEMA) brush polymers of different compositions. Moreover, particle stability in biological media was evaluated. Stability study revealed that p(METAC stat PEO19MEMA) modified GdPO4 particles show superior stability in aqueous colloids, enhanced stability in biological media. A remarkable advantage of such modified particles is they can be redispersed from dry state which can be useful both commercially and practically. Hydrothermally synthesized GdPO4 nanofibers were used for development of novel nanofibrous GdPO4 aerogel. Such GdPO4 aerogel displayed magnetic properties, large surface area and was ultralight. Obtained aerogel represents a new class of lanthanide-based materials. |
