Self-Suspended Suspensions of Covalently Grafted Hairy Nanoparticles
Type
ArticleKAUST Grant Number
KUS-C1-018-02Date
2015-03-04Online Publication Date
2015-03-04Print Publication Date
2015-03-17Permanent link to this record
http://hdl.handle.net/10754/599584
Metadata
Show full item recordAbstract
© 2015 American Chemical Society. Dispersions of small particles in liquids have been studied continuously for almost two centuries for their ability to simultaneously advance understanding of physical properties of fluids and their widespread use in applications. In both settings, the suspending (liquid) and suspended (solid) phases are normally distinct and uncoupled on long length and time scales. In this study, we report on the synthesis and physical properties of a novel family of covalently grafted nanoparticles that exist as self-suspended suspensions with high particle loadings. In such suspensions, we find that the grafted polymer chains exhibit unusual multiscale structural transitions and enhanced conformational stability on subnanometer and nanometer length scales. On mesoscopic length scales, the suspensions display exceptional homogeneity and colloidal stability. We attribute this feature to steric repulsions between grafted chains and the space-filling constraint on the tethered chains in the single-component self-suspended materials, which inhibits phase segregation. On macroscopic length scales, the suspensions exist as neat fluids that exhibit soft glassy rheology and, counterintuitively, enhanced elasticity with increasing temperature. This feature is discussed in terms of increased interpenetration of the grafted chains and jamming of the nanoparticles. (Chemical Presented).Citation
Choudhury S, Agrawal A, Kim SA, Archer LA (2015) Self-Suspended Suspensions of Covalently Grafted Hairy Nanoparticles. Langmuir 31: 3222–3231. Available: http://dx.doi.org/10.1021/la5048326.Sponsors
This work was supported by the National Science Foundation, award no. DMR-1006323, and by award no. KUS-C1-018-02 from King Abdullah University of Science and Technology (KAUST). Use of the Cornell High Energy Synchrotron Source was supported by the U.S. DOE under contract no. DE-AC02-06CH11357. This work made use of the Cornell Center for Materials Research Shared Facilities, which is supported through the NSF MRSEC program (DMR-1120296). We thank Dr. Rajesh Mallavajula for his insights and ideas. We acknowledge Dr. Ivan Keresztes for help with the NMR experiment. We also thank Adithya Sagar Gurram for his help with the DFT calculations.Publisher
American Chemical Society (ACS)Journal
LangmuirPubMed ID
25712578ae974a485f413a2113503eed53cd6c53
10.1021/la5048326
Scopus Count
Collections
Publications Acknowledging KAUST SupportRelated articles
- Interactions, Structure, and Dynamics of Polymer-Tethered Nanoparticle Blends.
- Authors: Agrawal A, Wenning BM, Choudhury S, Archer LA
- Issue date: 2016 Aug 30
- Dynamics and yielding of binary self-suspended nanoparticle fluids.
- Authors: Agrawal A, Yu HY, Srivastava S, Choudhury S, Narayanan S, Archer LA
- Issue date: 2015 Jul 14
- From colloidal stability in ionic liquids to advanced soft materials using unique media.
- Authors: Ueno K, Watanabe M
- Issue date: 2011 Aug 2
- Effect of bidispersity in grafted chain length on grafted chain conformations and potential of mean force between polymer grafted nanoparticles in a homopolymer matrix.
- Authors: Nair N, Wentzel N, Jayaraman A
- Issue date: 2011 May 21
- The Rheology of Bimodal Mixtures of Colloidal Particles with Long-Range, Soft Repulsions.
- Authors: Hunt WJ, Zukoski CF
- Issue date: 1999 Feb 15