Using neutron reflectometry and reflection geometry "near-surface" SANS to investigate surfactant micelle organization at a solid-solution interface

Physica B: Condensed Matter

Volumn 357, Issue 1-2 SPEC. ISS., 2005, Pages 88-93

  Hamilton, W A ^a   Porcar, L ^a,b,c   Magid, L J ^d  

^a OAK RIDGE NATIONAL LABORATORY   (United States)

^b NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY   (United States)

^c UNIVERSITY OF MARYLAND   (United States)

^d UNIVERSITY OF TENNESSEE   (United States)

Author keywords

CTAB; Micelles; Neutron reflectometry; Poiseuille shear; SANS

Indexed keywords

CETYLTRIMETHYAMMONIUM BROMIDE (CTAB); NEUTRON REFLECTOMETRY; POISEUILLE SHEAR; SMALL ANGLE NEUTRON SCATTERING (SANS);

CORRELATION METHODS; NEUTRON REFLECTION; NEUTRON SCATTERING; QUARTZ; SENSORS; SURFACE ACTIVE AGENTS; SURFACE TENSION; THERMAL EFFECTS;

MICELLES;

EID: 13444291536     PISSN: 09214526     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.physb.2004.11.028     Document Type: Conference Paper

References (16)

1. Essentially these are smaller versions of the cell we have previously described in detail (S.M.Baker, et al., Rev. Sci. Instrum. 65 (1994) 412), with the modification that the integrated teflon trough has been replaced by an teflon o-ring sealed trough in a stainless steel base.
2. W.A. Hamilton Physica B 221 1996 309; W.A. Hamilton Phys. Rev. Lett. 72 1994 2219
3. W.A. Hamilton Physica B 221 1996 309; W.A. Hamilton Phys. Rev. Lett. 72 1994 2219
4. W.A. Hamilton J. Neutron Res. 2 1994 1; M. Yethiraj, J.A. Fernandez-Baca, in: D.A. Neuman, T.P. Russell, B.J. Wuensch (Eds.), Materials Research Society Symposium Proceedings 376, "Neutron Scattering in Materials Science II", 1995.
5. W.A. Hamilton J. Neutron Res. 2 1994 1; M. Yethiraj, J.A. Fernandez-Baca, in: D.A. Neuman, T.P. Russell, B.J. Wuensch (Eds.), Materials Research Society Symposium Proceedings 376, "Neutron Scattering in Materials Science II", 1995.
6. W.A. Hamilton J. Chem. Phys. 116 2002 8533
7. The data collection and profile modelling analysis package for MIRROR was developed by W.A. Hamilton and J.B. Hayter. It's NR model fitting uses standard dynamical iterative calculation methods: T.P. Russell, Mater. Sci. Rep. 5 (1990) 171; J. Lekner Physica B 173 1991 99
8. The data collection and profile modelling analysis package for MIRROR was developed by W.A. Hamilton and J.B. Hayter. It's NR model fitting uses standard dynamical iterative calculation methods: T.P. Russell, Mater. Sci. Rep. 5 (1990) 171; J. Lekner Physica B 173 1991 99
9. This instrument has been shortened from the 30 m geometry described in W.C. Koehler, Physica B 137 (1986) 320. Its operation and data correction procedures remain unchanged.
10. Like most reflectometers MIRROR's transverse (y) resolution is usually relatively poor, in these scans δ Q y = 0.016 Å - 1 rms - more than an order of magnitude worse than the instrument's intrinsic perpendicular resolution (δ Q z ∼ 0.001 Å - 1). However, as δ Q y is by definition the root mean square transverse scattering vector component corresponding to a detector pixel it can, to first order for isotropic scattering, simply be added in quadrature to the in-solution scattering vector on the reflection plane (Q y =0) to correct for this smearing. This is not an important correction at the Q ranges covered in this work, but would become important at lower Q values or in high-resolution measurements. For details see Ref. [4].
11. F. Quirion, and L.J. Magid J. Phys. Chem. 90 1986 5435
12. For example: J. Penfold, et al., Physica B 221 (1996) 325; M.C. Gerstenberg Phys. Rev. E 58 1998 8028
13. For example: J. Penfold, et al., Physica B 221 (1996) 325; M.C. Gerstenberg Phys. Rev. E 58 1998 8028
14. Assuming Newtonian parabolic flow profile across the 1 mm trough the applied surface shear rate in Hertz will be numerically equal to 6000 times the mean flow speed through the cell in m/s. So 3000 Hz corresponds to a flow speed of about 0.5 m/s.
15. In our system the greatest shear rate experienced by a fluid will be in the gear pump driving the flow, thus the most likely place for heating to have occurred. Despite the control and evenness of flow advantages of this pumping system we are currently considering replacing it with peristaltic or a piston driven flow for some applications - including the present one.
16. T.L. Kuhl Rev. Sci. Instrum. 72 2001 1715