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Title Friction of zwitterionic hydrogel by dynamic polymer adsorption
Author(s) Ahmed, Jamil; Yamamoto, Tetsurou; Guo, Honglei; Kurokawa, Takayuki; Nonoyama, Takayuki; Nakajima, Tasuku;Gong, Jian Ping
Citation Macromolecules, 48(15): 5394-5401
Issue Date 2015-08-11
Doc URL http://hdl.handle.net/2115/62481
RightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules,copyright © American Chemical Society after peer review and technical editing by the publisher. To access the finaledited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.macromol.5b00602.
Type article (author version)
Additional Information There are other files related to this item in HUSCAP. Check the above URL.
File Information Supporting Information.pdf
Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP
1
Supporting Information
Friction of zwitterionic hydrogel by dynamic polymer adsorption
Jamil AHMED, Tetsurou YAMAMOTO, Honglei GUO, Takayuki KUROKAWA, Takayuki NONOYAMA, Tasuku NAKAJIMA, Jian Ping GONG
Figure S1. Frictional stress σ vs. sliding velocity v for PCDME hydrogel sliding over
glass substrates with varied wettability. Contact angles of glass substrates to water θw
are shown in figure. Hydrogel: PCDME (S-‐16.0). Substrates: G1 and G3 series, Normal
pressure: 2.75 kPa.
0
1
2
3
4
5
0 1 2 3 4 5 6
15.138.856.398.1106.6
Fric
tiona
l stre
ss, σ
(kP
a)
Sliding velocity, v x 1000 (m/s)
θw(o)
2
Figure S2. Dependence of frictional behavior of PCDME hydrogel on the ionic
strength of the medium. (a) Overall frictional stress σ vs. sliding velocity v, (b) Ratio
of elastic component of frictional stress σel to shear modulus G vs. Weissenberg
number We=(v/ξ)τf, (c) Adsorption time τb vs. Weissenberg number. The adsorption
time τb was estimated from the results of Figure S2a using Equation (15).
Concentrations of NaCl are shown in figure. Hydrogel: PCDME with swelling degree
q=20.1. Substrates: G2-‐1, Normal pressure: 5.5 kPa. Figure S2a is cited from
reference 23.
10-7
10-6
10-5
10-4
10-3
10-3 10-2 10-1 100
0.00.10.51.05.0
τ b (s)
(v/ξ)τf
CNaCl
(M)
10-1
100
10-2 10-1 100
0.00.10.51.05.0
σel /G
(v/ξ)τf
CNaCl
(M)
102
103
104
10-4 10-3 10-2
0.00.10.51.05.0Fr
ictio
nal s
tress
, σ (P
a)
Sliding velocity, v (m/s)
CNaCl
(M)
(a) (b) (c)
3
Figure S3. Dependence of frictional behavior of PCDME hydrogel on pH of the
medium. (a) Overall frictional stress σ vs. sliding velocity v, (b) Ratio of elastic
component of frictional stress σel to shear modulus G vs. Weissenberg number
We=(v/ξ)τf, (c) Adsorption time τb vs. Weissenberg number. The adsorption time τb
was estimated from the results of Figure S3a using Equation (15). pH of the medium
are shown in figure. Hydrogel: PCDME with swelling degree q=20.1. Substrates: G2-‐1,
Normal pressure: 5.5 kPa. Figure S3a is cited from reference 23.
10-7
10-6
10-5
10-4
10-3
10-3 10-2 10-1 100
1.93.435.07
6.639.811.412.7
τ b (s)
(v/ξ)τf
pH
10-3
10-2
10-1
100
101
10-3 10-2 10-1
1.93.435.076.63
9.811.412.7
σel / G
(v/ξ)τf
pH
102
103
104
10-4 10-3 10-2
1.93.435.076.639.811.412.7Fr
ictio
nal s
tress
, σ (P
a)
Sliding velocity, v (m/s)
pH
(a)
(b) (c)