Yang, Hyunseung Ku, Kang Hee Shin, Jae Man Lee, Junhyuk Park, Chan Ho Cho, Han-Hee Jang, Se Gyu Kim, Bumjoon J. 2024-01-20T05:01:16Z 2024-01-20T05:01:16Z 2021-09-05 2016-02-09 0897-4756 https://pubs.kist.re.kr/handle/201004/124393 Surface-engineered, 10 nm-sized graphene quantum dots (GQDs) are shown to be efficient surfactants for producing 3-pentadecyl phenol (PDP)-combined poly(styrene-b-4-vinylpyridine) (PS-b-P4VP(PDP)) particles that feature tunable shapes and internal morphologies. The surface properties of GQDs were modified by grafting different alkyl ligands, such as hexylamine and oleylamine, to generate the surfactant behavior of the GQDs. In stark contrast to the behavior of the unmodified GQDs, hexylamine-grafted GQDs and oleylamine-grafted GQD surfactants were selectively positioned on the PS and P4VP(PDP) domains, respectively, at the surface of the particles. This positioning effectively tuned the interfacial interaction between two different PS/P4VP(PDP) domains of the particles and the surrounding water during emulsification and induced a dramatic morphological transition to convex lens-shaped particles. Precise and systematic control of interfacial activity of GQD surfactants was also demonstrated by varying the density of the alkyl ligands on the GQDs. The excellent surface tunability of 10 nm-sized GQDs combined with their significant optical and electrical properties highlight their importance as surfactants for producing colloidal particles with novel functions. English AMER CHEMICAL SOC POLYMER PARTICLES DIBLOCK COPOLYMERS THIN-FILMS NANOPARTICLES NANOSTRUCTURES MICROSPHERES MIXTURES DRIVEN NANOCOMPOSITES TEMPERATURE Engineering the Shape of Block Copolymer Particles by Surface-Modulated Graphene Quantum Dots Article 10.1021/acs.chemmater.5b04222 1 CHEMISTRY OF MATERIALS, v.28, no.3, pp.830 - 837 CHEMISTRY OF MATERIALS 28 3 830 837 scie scopus 000370112200021 2-s2.0-84957966250 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article POLYMER PARTICLES DIBLOCK COPOLYMERS THIN-FILMS NANOPARTICLES NANOSTRUCTURES MICROSPHERES MIXTURES DRIVEN NANOCOMPOSITES TEMPERATURE Surfactant Graphene Quantum dot block copolymer nanoparticle