Abstract. Nanosized particles have attractive characteristics, which have received considerable attention in the last decade. Polymeric nanoparticles (PNP)s are solid particles or particulate dispersions with size in the range of 10-1000 nm. Due to the very small size, the surface area is very large so the percentage of atoms or molecules on the surface is significantly increased, which is expected to have extensive applications in various fields such as drug delivery systems, biosensors, catalysts, nanocomposites, agriculture and environment. The aim of the present paper is to critically review enhancement in the field of synthesis and different application of novel PNPs in various area from drug delivery to composite fabrication. Literature sources were mainly taken from the publications of 2011 and later; though, for a basic depiction of the structural principles, older publications have also been cited. Vol.10, No.11 (2016) 895-913 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2016.84 * Corresponding author, e-mail: mallak@cc.iut.ac.ir © BME-PT of these methods as low cost and safe ways should be highlighted. Furthermore, their importance according to their applications discusses. We will also show some properties of them such as morphology and biological activity. Keywords: biopolymers, biocomposites, polymeric nanoparticles, drug delivery systems, biosensors eXPRESS Polymer Letters

In this study Mg/Al layered double hydroxides (LDHs) and organo-modified chiralLDHs were synthesized in one step under green conditions. Co-precipitation reaction of the Al(NO 3 ) 3 . 9H 2 O, Mg(NO 3 ) 2 . 6H 2 O and different biocompatible N,N-(pyromellitoyl)-bis-L-amino acids was carried 10 out in aqueous solution in a short time by ultrasonic technique. Field emission scanning electron microscopy and transmission electron microscopy techniques showed that the resulting products have good crystallinity and uniform morphology. The presence of the bioactive surfactants in the interlayer space of LDH was confirmed by the Fourier transformed infrared spectroscopy, X-ray diffraction (XRD) and thermogravimetry analysis techniques. As expected, the positions of the 15 basal reflections in the XRD patterns of modified samples are shifted to higher d value indicating the expansion in the interlayer distance. Thermal properties were investigated by thermogravimetry analysis technique.

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