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Hybrid Assembly of Layered Double Hydroxide Nanocrystals with Inorganic, Polymeric and Biomaterials from Micro‐ to Nanometer Scales
Author(s) -
Lee Jong Hyeon,
Nam Hye Jin,
Rhee Seog Woo,
Jung DukYoung
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800668
Subject(s) - monolayer , polymer , hydroxide , chemistry , nanocrystal , chemical engineering , colloid , self assembly , adsorption , nanotechnology , materials science , inorganic chemistry , organic chemistry , engineering
Monolayer assemblies of zeolite microcrystals, polymer nanobeads and caged proteins were successfully applied to a highly ordered MgAl‐LDH monolayer by using the electrostatic attractions between the negatively charged particles and positively charged MgAl‐LDH without chemical modifications. Ultrasonication leads to the monolayer assembly of ZSM‐5 microcrystals with a maximum preferred contact over the MgAl‐LDH monolayer, where the ZSM‐5 microcrystals are oriented in the (0 k 0) crystallographic direction. PMMA and ferritin were also adsorbed on the monolayer LDH nanocrystal surface through self‐assembly in solution. Homogeneous PMMA colloids‐LDH composite layers on Si were successfully prepared, thanks to the improved interfacial compatibility between the immobilized LDH and polymer surface charges. Thermal treatment at 150 °C resulted in the formation of continuous polymer coatings over the LDH/Si monolayer. The mixing of colloidal solutions of LDH and PMMA led to the formation of bulk‐type polymer‐LDH composites after the melting of the polymer phase, where the polymer was homogeneously coated over the LDH crystals without the phase segregation of the LDH nanocrystals. The charged hydroxide layers of the LDH nanocrystals provided the multi‐functional interface characteristics required to assemble the functional particles, resulting in the binary hybrid structures of inorganic‐inorganic, polymer‐inorganic or bio‐inorganic composites. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)