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3D structure of dendritic and hyper-branched macromolecules by X-ray diffraction |
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| Authors: | Valeri Petkov Vencislav Parvanov Douglas Swanson Tom Vogt |
| Affiliation: | a Department of Physics, Central Michigan University, Mt Pleasant, MI 48858, USA b Dendritic NanoTechnologies, Mt Pleasant, MI 48858, USA c Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA d Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA |
| Abstract: | The atomic ordering in dendritic and hyper-branched macromolecules has been determined by X-ray diffraction. The approach of the atomic pair distribution function technique has been used due to the lack of 3D periodicity in these polymeric materials. Dendrimers are found to possess a semi-regular structure riddled with nanosize cavities. The cavities are joined into channels connecting dendrimer's surface and core. In contrast, hyper-branched polymers are rather irregular at the atomic scale and with less accessible interior. |
| Keywords: | 61.10.Nz 61.41.+e 61.43.Bn |
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