30^th World Nano Conference May 20-21, 2019 Zurich, Switzerland

Myung Chul Chang has completed his PhD at the age of 37 years from Seoul National University and postdoctoral studies from University Illinois at Urbana Champaign. He is the director of Biomaterials Lab. He has published more than 50 papers in reputed journals and has been serving as an editorial board member of repute.

In this study, solution precipitation processes were used in order to synthesize calcium phosphate powder crystallites with nano-macro and meso-scale order. Calcium phosphate [CaP] powders were precipitated by using free-like ions of Ca2+ and H3-xPO4 from aqueous solution of calcium hydroxide [Ca(OH)2] and phosphoric acid [H3PO4]. According to phase boundary in the CaO-P2O5 phase diagram the concentration of Ca2+ and H3-xPO4 was controlled to make from nano- to macro- scale uniform crystallites. This research goal has been to attain the gyroid geometry in CaP bone blocks. The gyroid gyometry was found in butterfly-inspired nanostructure of long-tailed hairstreak butterfly, which can sort light. The green hairstreak butterfly (Callophrys rubi) gets its blue-green hue from complex nanoscale structures on its wings. The structures, called gyroids, are repeating patterns of spiral-shaped curls. Light waves bouncing off the patterned surface interfere with one another, amplifying green colors while washing out other shades. We have prepared copolymer template having gyroid chain structure. A polystyrene-b-polyisoprene-b-polystyrene [SIS] copolymer was synthesized via anionic polymerization. In order to give the gyroid chain structure in CaP bone blocks, triblock copolymers with gyroid chains was prepared through copolymerization (PS-PI/PS) of styrene monomer and isoprene monomer, and used for obtaining gyroid template of CaP nano-crystallites. Isoprene copolymer [PI] in PS-PI/PS gyroid copolymer composites was dissolved in solution and then CaP was infiltrated to get biomimetic gyroid chains in bone. Bone is a metalbolic gyometry of CaP crystallites and pores, in which bone cell may like to live.

Jean-Paul Lellouche (1981 PhD degree/education in Organic Chemistry field, University La Doua, Lyon - France) moved in October 2000 to the Bar-Ilan University (Ramat-Gan, Israel) - Department of Chemistry & Institute of Nanotechnology & Advanced Materials as a Full Professor in synthetic Organic Chemistry/Nano(bio)technology (July 2008) & recent Dpt Head (Oct 2017-July 2018). His main current R&D activities concern nanomaterials engineering science (magnetic/non-magnetic drug/siRNA & micro RNA delivery systems, theranostic nanoparticles for human therapy). He authored 155 peer-reviewed scientific papers (2,528 citations), 15 patents, and 4 book chapters together with a recent start-up creation activity (January 2019 – NANODROPs project).

Tungsten disulfide nanotubes (INTs-WS2) are extremely hydrophobic and chemically inert inorganic nanomaterials. This feature quite strongly limits their usefulness in numerous mechanical hardness and tribology-relating research developments and subsequent industrial/bio-active end-applications. Thus, the covalent versatile linkage of any kind of functional organic and/or biology-relating species remains a quite critical developmental step towards highly innovative high-performance nanomaterials and multiphase composites in the field of essential interfacial versatile chemistries. In such a highly challenging methodology/ functionalization issue context concerning these chemically inert hydrophobic nanomaterials, an innovative method of surface functionalization (versatile polycarboxylation – polyCOOH shell formation) of multi-walled inorganic nanotubes (INTs-WS2) and fullerene-like (IFs-WS2) nanoparticles has been successfully developed. This covalent functionalization method makes use of highly electrophilic and reactive imminium salts (Vilsmeier-Haack (VH) complexes reactions) in order to enable the introduction of a chemically versatile polyacidic (polyCOOH) shell onto the surface of VH-treated inorganic nanomaterials. Moreover, a significant statistical Design Of Experiments (DoE) method has been also involved for global optimization of this multi-parametric polyCOOH shell generation. This novel INTs-nanotube sidewall polyCOOH functionalization enabled innovative-targeted interfacial chemistries. Indeed, it enabled the effective nanofabrication of a wide range of covalent WS2-INTs surface modifications (polyNH2, polyOH, polySH) via (i) polyCOOH chemical activation (EDC, CDI) and (ii) 2nd step covalent nucleophilic substitutions by short -aminated bifunctional ligands H2N-linker-X (X outer surface functionality). Moreover, an additional innovative surface engineering methodology for same multi-walled inorganic nanotubes (INTs-WS2) has been also discovered via use of small 5.5-6.0 nm-sized lanthanide action/complex-doped magnetic maghemite nanoparticles towards corresponding magnetically responsive inorganic nanotubes for photo-thermal therapy (PTT) anti-cancer bioactivity. Resulting fully characterized functional INTs-WS2 (f-INTs-WS2) have a quite wide potential for use as novel functional nanoscale fillers toward new mechanically strengthened and/or conductive composite polymeric matrices (case of hybrid polythiophenedecorated f-INTs-WS2 nanocomposites, Figure 1). Corresponding novel functional nanomaterials/nanoscale fillers have been also shown to be PTT bioactive and non-toxic in preliminary toxicity studies, which opens a wide R&D route/progress for relating end-user applications (cellular toxic CNTs nanofillers replacement for example).

Anatolie Sidorenko is specialized in the field of nanotechnologies and functional superconducting nanostructures. He is director of Institute of Electronic Engineering and Nanotechnologies Academy of Sciences of Moldova, author of over 400 scientific publications, 42 patents, the editor of 4 books published in “Springer”, the editor of two thematic series “Functional Nanostructures” of Beilstein Journal of Nanotechnology, associated editor of Moldavian Journal of the Physical Sciences, member of Moldavian Academy of Sciences, member of Deutsche Physikalische Gesellschaft (DPG).

Last decade there is an intensive study of superconductor-ferromagnet (S/F) nanostructures all over the world,  motivated by rapid increasing their applications in superconducting electronics - spintronics. Theory of S/F hybrid nanostructures with two and more ferromagnetic layers predicts generation of a non-uniform superconductivity, a longrange odd-in-frequency triplet pairing at non-collinear alignment (NCA) of the F-layers magnetizations. Using the ideas of the superconducting triplet spin valve we have fabricated functional nanostructures Co/CoOx/Cu41Ni59/Nb/ were triplet pairing with switching from normal to superconducting state takes place. The resistance of the samples as a function of an external magnetic field shows that the system is superconducting at the collinear alignment of the Cu41Ni59 and Co layers magnetic moments, but switches to the normal conducting state at the NCA configuration. Upon cycling the in-plane magnetic field and keeping temperature close to the superconducting transition, a memory effect has been detected, The fabricated S/F functional nanostructures can serve as the rapid operating switching element of superconducting electronics and memory element MRAM for novel computers generation. Research is supported by the HORIZON-2020 Twinning project “SPINTECH”.