- Collection:
- Clark Atlanta University Faculty Publications
- Title:
- A Comparative Study of the Self-Assembly of Achiral and Chiral Hairy Nanoparticles with Polystyrene Cores and Poly (2- hydroxyethylmethacrylate) Hairs
- Creator:
- Habel, Azza
Khan, Ishrat M. - Date of Original:
- 2020
- Subject:
- African Americans--Education (Higher)--Georgia
Clark Atlanta University - Location:
- United States, Georgia, Fulton County, Atlanta, 33.749, -84.38798
- Medium:
- publications (documents)
- Type:
- Text
- Format:
- application/pdf
- Description:
- Hairy nanoparticles with polystyrene cores (PS cores) and poly(2 hydroxyethylmethacrylate) (PHEMA) shells were synthesized by combining living anionic polymerization and atom transfer radical polymerization (ATRP). The structural characterization was carried out by FT-IR and NMR spectroscopy (1H NMR, 13C NMR, APT 13C NMR and 1H 13C HMQC). The thermal stability of the PS cores was not a?ected by grafting PHEMA on their surfaces. A di?erential scanning calorimetry (DSC) thermogram of the HNPs showed two distinct transition temperatures indicating microphase separation. Chiral HNPs were prepared by inducing chirality in the achiral HNPs by complexation with R- or S-mandelic acid. The circular dichroism (CD) spectroscopy of complexes of the HNPs/R- or S-mandelic acid indicated the formation of enantiomeric chiral structures. The self-assembled structures formed from the achiral HNPs show di?erent surface morphologies, porous and zigzag, dependent on the solvents used. Blends of polystyrene functionalized with hydroxyl groups and PHEMA show di?erent morphology and thermal properties compared with the core shell HNP system. The chiral HNPs self-assembled into donut like structures or toroids with sizes in the range between 200 to 5000 nm. The study suggests that chirality can be utilized to develop interesting self-assembled structures.
- Metadata URL:
- http://hdl.handle.net/20.500.12322/cau.ir:2020_habel_azza
- Original Collection:
- Clark Atlanta University Faculty Publications
- Holding Institution:
- Atlanta University Center Robert W. Woodruff Library
- Rights:
-
