PMID- 31942904
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20200312
LR  - 20200316
IS  - 1744-6848 (Electronic)
IS  - 1744-683X (Linking)
VI  - 16
IP  - 10
DP  - 2020 Mar 11
TI  - Diffusion dynamics of a single collapsed homopolymer globule at the solid-liquid 
      interface.
PG  - 2431-2436
LID - 10.1039/c9sm02335f [doi]
AB  - Contradictive to the conventional wisdom that a collapsed polymer globule in poor 
      solvents adsorb on surfaces in a way analogous to the spreading of a liquid 
      droplet, here we have shown via single molecule measurements that a single 
      poly(N-isoporpylacrylamide) (PNIPAM) globule can jump from one spot to another as 
      an elastic nonadhesive ball even on a hydrophobic polystyrene surface. The 
      molecular weight dependence of the effective surface diffusion coefficient 
      measured for the adsorbed globule suggested that it exhibited mostly a similar 
      globular conformation to that in the bulk solution. Both the displacement and 
      waiting time distributions of the adsorbed globules were found to follow a 
      power-law decay rather than an exponential process, suggesting a broad 
      distribution of binding energies due to the difference in degree of globule 
      deformation. These effects together reflect a character of the viscoelasticity 
      even in a single-chain globule in dilute solutions. Our findings also demonstrate 
      that it is not the single-chain globule but the inter-globule aggregates at high 
      concentration that lead to irreversible adsorption on the surface, which provides 
      novel dynamics and mechanisms of how a thermosensitive polymer adsorbs on the 
      hydrophobic surface above its lower critical solution temperature.
FAU - Cai, Shali
AU  - Cai S
AD  - School of Chemistry, Chemical Engineering and Life Science, Wuhan University of 
      Technology, Wuhan 430070, China. leishen@whut.edu.cn.
FAU - Liu, Jingjing
AU  - Liu J
FAU - Tian, Mengting
AU  - Tian M
FAU - Wang, Kang
AU  - Wang K
FAU - Shen, Lei
AU  - Shen L
LA  - eng
PT  - Journal Article
PL  - England
TA  - Soft Matter
JT  - Soft matter
JID - 101295070
SB  - IM
EIN - Soft Matter. 2020 Jan 24;:. PMID: 31976507
EDAT- 2020/01/17 06:00
MHDA- 2020/01/17 06:01
CRDT- 2020/01/17 06:00
PHST- 2020/01/17 06:00 [pubmed]
PHST- 2020/01/17 06:01 [medline]
PHST- 2020/01/17 06:00 [entrez]
AID - 10.1039/c9sm02335f [doi]
PST - ppublish
SO  - Soft Matter. 2020 Mar 11;16(10):2431-2436. doi: 10.1039/c9sm02335f.