scholarly journals Topography of neutron scattering from diblock copolymer film

1994 ◽  
Author(s):  
Z. Cai ◽  
T.P. Russell
Keyword(s):  
Neutron Scattering ◽  
Diblock Copolymer ◽  
Copolymer Film

Comments concerning "Fluorescent probe studies on the microstructure of polystyrene-poly(vinylpyridine) diblock copolymer film"

1993 ◽  
Vol 26 (26) ◽  
pp. 7366-7366 ◽  
Author(s):  
William E. Acree ◽  
Sheryl A. Tucker ◽  
Denise C. Wilkins
Keyword(s):  
Fluorescent Probe ◽  
Diblock Copolymer ◽  
Copolymer Film

scholarly journals Spin-echo small-angle neutron scattering (SESANS) studies of diblock copolymer nanoparticles

Soft Matter ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 17-21
Author(s):  
Gregory N. Smith ◽  
Victoria J. Cunningham ◽  
Sarah L. Canning ◽  
Matthew J. Derry ◽  
J. F. K. Cooper ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Diblock Copolymer ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo ◽  
Real Space ◽  
Polymer Nanoparticles ◽  
High Contrast ◽  
Concentrated Dispersions

Concentrated dispersions of polymer nanoparticles with high contrast can be studied using SESANS in real space.

Inhomogeneous dynamic nuclear polarization of protons in a lamella-forming diblock copolymer investigated by a small-angle neutron scattering method

2011 ◽  
Vol 44 (3) ◽  
pp. 503-513 ◽  
Author(s):  
Yohei Noda ◽  
Takayuki Kumada ◽  
Takeji Hashimoto ◽  
Satoshi Koizumi
Keyword(s):  
Neutron Scattering ◽  
Diblock Copolymer ◽  
Dynamic Nuclear Polarization ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Second Order ◽  
Third Order ◽  
Proton Polarization

By combining two methods of selective doping of paramagnetic species into a microdomain and small-angle neutron scattering (SANS), thespatially inhomogeneous proton polarizationcreated by dynamic nuclear polarization (DNP) has been precisely evaluated. A lamella-forming diblock copolymer composed of polystyrene (PS) and polyisoprene (PI) block chains (PS-b-PI) was employed, the SANS profile of which clearly shows scattering peaks up to the third order due to interlamellar interference. As a source of electron spin for DNP, 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) was doped into one or other of the microdomains; samples with PS or PI microdomains selectively doped with TEMPO are designated PS.-b-PI and PS-b-PI., respectively. The SANS intensity at the first- and third-order peaks is well reproduced by assuming that the proton polarization is homogeneous throughout the sample, but that at the second-order peak cannot be explained by this assumption. This anomaly regarding the second-order peak was successfully explained by a model postulating that proton polarization in a doped microdomain decreases with increasing distance from the interface with a neighbouring doped microdomain. The decrease in proton polarization at the centre of a doped microdomain was estimated to be 0.07 (2) for PS-b-PI.and 0.05 (1) for PS.-b-PI, relative to constant proton polarization in a doped microdomain. The inhomogeneous proton polarization results from two competing dynamic processes,i.e.spin diffusion from doped to undoped microdomains, and spin lattice relaxation occurring on the pathway of proton spin diffusion.

Fluorescent probe studies on the microstructure of polystyrene-poly(vinylpyridine) diblock copolymer film

1992 ◽  
Vol 25 (25) ◽  
pp. 6866-6870 ◽  
Author(s):  
Kenichi Nakashima ◽  
Mitchell A. Winnik ◽  
Kevin H. Dai ◽  
Edward J. Kramer ◽  
Junichiro Washiyama
Keyword(s):  
Fluorescent Probe ◽  
Diblock Copolymer ◽  
Copolymer Film

Transfer of a chemical substrate pattern into an island-forming diblock copolymer film

1999 ◽  
Vol 111 (24) ◽  
pp. 11101-11110 ◽  
Author(s):  
Jakob Heier ◽  
Jan Genzer ◽  
Edward J. Kramer ◽  
Frank S. Bates ◽  
Stefan Walheim ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Copolymer Film
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