John A. Pople | Stanford Synchrotron Radiation Lightsource

Stanford Synchrotron Radiation Lightsource
2575 Sand Hill Road

Tel 650-926-3827; Fax 650-926-3600
e-mail: pople [at] slac.stanford.edu

Research/Professional Focus

Research physics in the arena of Materials Science, with special focus on SAXS Materials Science, as performed on Beamline 1-4.
Provision of experimental, technical and scientific support of the SAXS Materials Science dedicated beamline (BL1-4) at SSRL.

Qualifications

X-ray Optics & Materials Science; J.J. Thomson Laboratory, University of Reading, Whiteknights, Reading, RG6 6AF, UK	Ph.D. 1996
Applied and Modern Optics: J.J. Thomson Laboratory, University of Reading, Whiteknights, Reading, RG6 6AF, UK	MSc. 1992
California State University East Bay, Chemistry	M.S. 1989
Physics (Hons); H.H. Wills Laboratory, University of Bristol, Bristol, BS8 1TN, UK	BSc: 1991

Appointments

1998-present	Staff Scientist (Materials Science), Stanford Synchrotron Radiation Lightsource
1996-1997	Scientific Research Officer, School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
1996	Postdoctoral Research Associate, J.J. Thomson Laboratory, University of Reading, Reading, RG6 6AF, UK

Research

I perform research in SAXS/WAXS materials science; relating macroscopic material parameters to molecular structures, conformations and orientations. Most recently this has included studies of selective solvency of diblock copolymers in potential energy and data storage systems.^58,59 Other specific work has included original experimental verification of theories proposed for deformation mechanisms inducing molecular structural changes in polymeric blends,^1,31,52,54melts,^2,17,22,48 gels,^46,53,56 elastomers^{32,34,37,39,40,43} and liquid crystalline systems,^3-5,8,9 and comprehensive characterization of self assembling systems:⁵⁷ some targeted for use in state of the art electronics,^38,44.49 some as drug delivery systems.^{23,24,35,41,42} These latter have included study of the relevance of the branching architecture on the molecular radial density distribution,^26-28,33,45 and the effect of mechanical and thermal deformation on micellar packing.^{7,10-16,18-21,25} A novel organic study investigated the defect of the genetic dentinogenesis in teeth, relating the defect to the maturation processes of the mineral growing between the collagen fibers.^29,30,50

These experiments have been performed at synchrotrons in the UK, France, Germany and the US, and neutron sources in the UK, Denmark and the US. I have designed in-situ sample environment systems: including a shearing device for polymeric and surfactant solutions and gels with simultaneous scattering analysis,^16,19 and an integrated system which simultaneously controls streaming images from a CCD based x-ray detector synchronized with the sample's temperature, deformation condition and position within the probe beam.6

Publications

62. In Situ Tracking of Microstructure Spacing and Ordered Domain Compression during the Drying of Solution-Cast Block Copolymer Films Using Small-Angle X-ray Scattering, M. Heinzer, S. Han, J. A. Pople, D. Baird, S. Martin, Macromolecules 2012, 45, 8, 3480-3486
61. In Situ Measurement of Block Copolymer Ordering Kinetics during the Drying of Solution-Cast Films Using Small-Angle X-ray Scattering, M. Heinzer, S. Han, J. A. Pople, D. Baird, S. Martin, Macromolecules 2012, 45, 8, 3471-3479
60. Counterion Condensation in Nafion, K. M. Beers, D. T. Hallinan Jr., X. Wang, J. A. Pople, N. P. Balsara, Macromolecules 2011, 44, 22, 8866-8870
59. Phase Behavior of Polystyrene-block-poly(2-vinylpyridine) Copolymers in a Selective Ionic Liquid Solvent, J. M. Virgili, A. Hexemer, J. A. Pople, N. P. Balsara, R. A. Segalman, Macromolecules 2009, 42, 13, 4604-4613
58. Effect of Molecular Weight and Salt Concentration on Conductivity of Block Copolymer Electrolytes, A. Panday, S. Mullin, E. D. Gomez, N. Wanakule, V. L. Chen, A. Hexemer, J. Pople, N. P. Balsara, Macromolecules 2009, 42, 13, 4632-4637
57. Langmuir Monolayers of Straight-Chain and Branched Hexadecanol and Eicosanol Mixtures, R. E. Kurtz, M. F. Toney, J. A. Pople, Langmuir 2008, 24, 24, 14005-14014
56. Diffusion of Dextran Probes in a Self-Assembled Fibrous Gel Composed of Two-Dimensional Arborols, J. Sun, B. F. Lyles, K. H. Yu, J. Weddell, J. Pople, M. Hetzer, D. De Kee, P. S. Russo, Journal of Physical Chemistry B 2008, 12, 1, 29-35
55. Matrix fluorescence photobleaching recovery for polymer molecular weight distributions and other applications, G. J. Doucet, D. Dorman, R. Cueto, D. Neau, P. S. Russo, D. De Kee, J. Pople, Macromolecules 2006, 39, 26, 9446-9455
54. Effect of cross-linking on the structure and thermodynamics of lamellar block copolymers, E. D. Gomez, J. Das, A. K. Chakraborty, J. A. Pople, N. P. Balsara, Macromolecules 2006, 39, 14, 4848-4859
53. Some structural observations of self-assembled, fibrillar gels composed of two-directional bolaform arborols, J. Sun, K. H. Yu, P. S. Russo, J. Pople, A. Henry, B. Lyles, R. S. McCarley, G. R. Baker, G. R. Newkome, Polymeric Nanofibers 2006, 918, 370-383
52. Order-disorder transitions in cross-linked block copolymer solids, H. Hahn, A. K. Chakraborty, J. Das, J. A. Pople, N. P. Balsara, Macromolecules 2005, 38, 4, 1277-1285
51. Synchrotron and Simulations Techniques Applied to Problems in Materials Science: Catalysts and Azul Maya Pigments, R. R. Chianelli, M. Perez De la Rosa, G. Meitzner, M. Siadati, G. Berhault, M. J. Yácaman, A. Mehta, J. Pople, S. Fuentes, G. Alonzo, L. A. Polette, J. Synchrotron Rad. 2005, 12, 2, 129-134
50. Age-related transparent root dentin: mineral concentration, crystallite size, and mechanical properties, J. H. Kinney, R. K. Nalla, J. A. Pople, T. M. Breunig, R. O. Ritchie, Biomaterials 2005, 26, 16, 3363-3376
49. Dendritic polymers: Synthesis, characterization and application in advanced microelectronic devices, J. L. Hedrick, A. P. Gast, J. Pople, C. M. Stancik, M. Trollsas, Abs. Am. Chem. Soc. 2004, 227, 1, U873
48. Signatures of the order-disorder transition in copolymers with quenched sequence disorder, H. B. Eitouni, T. J. Rappl, E. D. Gomez, N. P. Balsara, S. Qi, A. K. Chakraborty, J. M. J. Frechet, J. A. Pople, Macromolecules; 2004; 37, 23, 8487-8490
47. Study on synthesis of TPA-silicalite-1 from initially clear solutions of various base concentrations by in situ calorimetry, potentiometry, and SAXS, S.-Y. Yang, A. Navrotsky, D. J. Wesolowski, J. A. Pople, Chemistry of Materials 2004, 16, 2, 210-219
46. Physical properties of arborol gels, J. R. Sun, K. Yu, P. Russo, J. A. Pople, Abs. Am. Chem. Soc. 2003, 226, 2, U404-U404
45. Impact of Core Architecture on Solution Properties of Dendrimer-like Star Copolymers, C. M. Stancik, J. A. Pople, M. Trollsas, P. Lindner, J. L. Hedrick, A. P. Gast, Macromolecules 2003, 36, 15, 5765-5775
44. Responsive solids from cross-linked block copolymers, H. Hahn, H. B. Eitouni, N. P. Balsara, J. A. Pople, Physical Review Letters 2003, 90, 155505
43. Component stress-strain behavior and small-angle neutron scattering investigation of stereoblock elastomeric polypropylene, W. Wiyatno, G. G. Fuller, J. A. Pople, A. P. Gast, Z. Chen, R. M. Waymouth, C. L. Myers, Macromolecules 2003, 36, 4, 1178-1187
42. Architectural Disparity Effects in the Morphology of Dendrimer-Linear Coil Diblock Copolymers, D. J. Pochan, L. Pakstis, E. Huang, C. Hawker, R. Vestberg, J. Pople, Macromolecules 2002, 35, 9239-9242
41. Structure of pH-dependent block copolymer micelles: charge and ionic strength dependence, A. S. Lee, V. Butun, S. P. Armes, J. A. Pople, A. P. Gast, Macromolecules 2002, 35, 22, 8540-8551
40. Dynamic Response of Stereoblock Elastomeric Polypropylene Studied by Rheo-Optics and X-ray Scattering: 2. Orthogonally Oriented Crystalline Chains, W. Wiyatno, J. A. Pople, A. P. Gast, R. M. Waymouth, G. G. Fuller, Macromolecules 2002, 35, 22, 8498-8508
39. Dynamic Response of Stereoblock Elastomeric Polypropylene Studied by Rheo-Optics and X-ray Scattering: 1. Influence of Isotacticity, W. Wiyatno, J. A. Pople, A. P. Gast, R. M. Waymouth, G. G. Fuller, Macromolecules 2002, 35, 22, 8488-8497
38. Thermodynamic Interactions in Organometallic Block Copolymers: Poly(styrene-block-ferrocenyldimethylsilane), H. B. Eitouni, N. P. Balsara, H. Hahn, J. A. Pople, M. A. Hempenius, Macromolecules 2002, 35, 20, 7765-7772
37. Orientation Dynamics and Crystallization of Elastomeric Polypropylenes, G. G. Fuller, W. Wiyatno, J. Pople, A. P. Gast, R. Waymouth, Abs. Am. Chem. Soc. 2002, 223, 2, D50-D50
36. Transgenic mice overexpressing TGF-b2 have altered biomineralization of dentin, G. W. Marshall, T. M. Breunig, M. Balooch, S. Habelitz, E. Filvaroff, P. K. Denbesteni, S. J. Marshall, J. F. Hilton, J. A. Pople, J. H. Kinney, J. Dent. Res. 2002, 81, A358-A358
35. SAXS solution study of self-assembling polyelectrolytic diblock copolymers, B. F. Lyles, A. P. Gast, J. A. Pople, S. A. Furlong, S. P. Armes, Abs. Am. Chem. Soc. 2002, 223, 1, U310-U310
34. Morphology of Thermoplastic Elastomers: Elastomeric Polypropylene, H. Schönherr, W. Wiyatno, J. Pople, C. W. Frank, G. G. Fuller, A. P. Gast, R. M. Waymouth, Macromolecules 2002, 35, 7, 2654-2666
33. Novel dendrimer-like star copolymer architectures investigated with scattering techniques, C. M. Stancik, J. A. Pople, J. L. Hedrick, A. P. Gast, Abs. Am. Chem. Soc. 2001, 222, 2, U351-U352
32. Rheo-Optics and X-ray Scattering Study of Elastomeric Polypropylene, W. Wiyatno, J. A. Pople, A. P. Gast, R. M. Waymouth, G. G. Fuller, Abs. Am. Chem. Soc. 2001, 222, 2, U365-U365
31. Small-angle x-ray scattering studies of poly(arylethinylene): molecular conformation in solution and orientational ordering in rod-coil ionomer blends, D. A. Winter, C. D. Eisenbach, J. A. Pople, A. P. Gast, Macromolecules 2001, 34, 17, 5943 -5949
30. Intrafibrillar mineral may be absent in Dentinogenesis Imperfecta Type II (DI-II) , J. H. Kinney, J. A. Pople, C. Driessen, G. W. Marshall, S. J. Marshall, J. Dental Res. 2001, 80, 6, 1555-1559
29. Collagen Orientation and Crystallite Size in Human Dentin: A Small Angle X-ray Scattering Study, J. H. Kinney, J. A. Pople, G.W. Marshall, and S.J. Marshall, Calcified Tissues Int. 2001, 69, 31-37
28. Dendrimer like star polymers: Amplification of dendrimer properties, structural conformation and hydrodynamic volume, M. Trollsås, H. Claesson, J. L. Hedrick, J. Pople, A. Gast, Abs. Am. Chem. Soc. 2000, 219, 162
27. Constitutional isomers of dendrimer like star polymers: design, synthesis and structural and conformational properties, M. Trollsås, B. Atthoff, A. Wursch, J. L. Hedrick, J. A. Pople, A. P. Gast, Macromolecules 2000, 33, 6423-6438
26. Conformational and structural properties of high functionality dendrimer-like star polymers synthesized from living polymerization techniques, M. Trollsås, H. Claesson, B. Atthoff, J. L. Hedrick, J. A. Pople, A. P. Gast, Macromol. Symposia 2000, 153, 87-108
25. A shear induced transition of lamellar alignment in a concentrated diblock copolymer solution, J. A. Pople, I. W. Hamley, J. P. A. Fairclough, A. J. Ryan, G. Hill, C. Price, Polymer 1999, 40, 5709
24. A SANS study of the solution properties of dendrimer-like star polymers, J. A. Pople, A. P. Gast, M. Trollsås, H. Claesson, J. L. Hedrick, Abs. Am. Chem. Soc. 1999, 217, 214
23. The versatile design and synthesis of dendrimer-like star polymers, M. Trollsås, B. Atthoff, H. Claesson, J. L. Hedrick, J. A. Pople, A. P. Gast, Abs. Am. Chem. Soc. 1999, 217, 180
22. The development of organized structures in polyethylene crystallized from a sheared melt, analyzed by WAXS and TEM, J. A. Pople, G. R. Mitchell, S. J. Sutton, A. S. Vaughan, C. K. Chai, Polymer 1999, 40, 10, 2769
21. Cubic gels and lamellar crystals in concentrated solutions of an amphiphilic diblock copolymer, I. W. Hamley, J. A. Pople, M. Ameri, C. Booth, Col. Surfaces A 1998, 145, 185-190
20. Shear-induced orientation of the body-centered-cubic phase in a diblock copolymer gel, I. W. Hamley, J. A. Pople, C. Booth, L. Derici, M. Impéror-Clerc, P. Davidson, Phys. Rev. E 1998, 58, 7620
19. Simultaneous rheology and small-angle x-ray scattering experiments on block copolymer gels and melts in cubic phases, I. W. Hamley, J. A. Pople, J. P. A. Fairclough, A. J. Ryan, A. J. Gleeson, B. U. Komanschek, E. Towns-Andrews, J. Appl. Cryst. 1998, 31, 881
18. Crystallization of alcohol ethoxylate diblock copolymers from body-centred cubic micellar phases formed in concentrated aqueous solutions, I. W. Hamley, J. A. Pople, M. Ameri, C. Booth, A. J. Ryan, Macromol. Chem. Phys. 1998, 199, 1753
17. X-ray rheology of unstructured and structured polymer melts, G. R. Mitchell, J. J. Holt, E. M. Andresen, J. A. Pople, Abs. Am. Chem. Soc. 1998, 216, 266
16. An integrated Couette system for in situ shearing of polymer and surfactant solutions and gels with simultaneous small angle X-ray scattering, J. A. Pople, I. W. Hamley, G. P. Diakun, Rev. Sci. Instrum. 1998, 69, 3015
15. Shear induced orientational order in the hexagonal phase of oxyethylene/oxybutylene diblock copolymer gels, J. A. Pople, I. W. Hamley, N. J. Terrill, J. P. A. Fairclough, A. J. Ryan, G.-E. Yu, C. Booth, Polymer 1998, 39, 4891
14. Shear-induced orientational transitions in the body-centred cubic phase of a diblock copolymer gel, I. W. Hamley, J. A. Pople, J. P. A. Fairclough, A. J. Ryan, C. Booth, Y.-W. Yang, Macromolecules 1998, 31, 3906
13. A small-angle neutron scattering study of shear-induced ordering in the cubic phase of a block copolymer gel, I. W. Hamley, J. A. Pople, C. Booth, Y.-W. Yang, S. M. King, Langmuir 1998, 14, 3182
12. A thermally induced transition from a body centred to a face centred cubic lattice in a diblock copolymer gel, I. W. Hamley, J. A. Pople, O. Diat, Col. Polym. Sci. 1998, 276, 446
11. Orientational ordering of a poly(oxyethylene) / poly(oxybutylene) diblock copolymer gel under steady shear flow, J. A. Pople, I. W. Hamley, J. P. A. Fairclough, A. J. Ryan, C. Booth, Macromolecules 1998, 31, 2952
10. Effect of shear on cubic phases in gels of a diblock copolymer, I. W. Hamley, J. A. Pople, J. P. A. Fairclough, N. J. Terrill, A. J. Ryan, C. Booth, G.-E. Yu, O. Diat, K. Almdal, K. Mortensen, M. Vigild, J. Chem. Phys. 1998, 108, 16, 6929-6936
09. Orientation effects in monodomain nematic liquid crystalline polysiloxane elastomers, D. Lacey, H. N. Beattie, G. R. Mitchell, J. A. Pople, J. Mater. Chem. 1998, 8, 53.
08. Mechanical switching and soft elasticity in liquid crystal elastomers, P. M. S. Roberts, G. R. Mitchell, F. J. Davis, J. A. Pople, Mol. Cryst. Liq. Cryst. 1997, 299, 181.
07. Ordered phases in aqueous solutions of diblock oxyethylene/oxybutylene copolymers investigated by simultaneous small-angle X-ray scattering and rheology, J. A. Pople, I. W. Hamley, J. P. A. Fairclough, A. J. Ryan, B. U. Komanschek, A. J. Gleeson, G.-E. Yu, C. Booth, Macromolecules 1997, 30, 5721
06. A two-dimensional X-ray scattering system for in-situ time-resolving studies of polymer structures subjected to controlled deformations, J. A. Pople, P. A. Keates, G. R. Mitchell, J. Synchrotron Rad. 1997, 4, 5, 267
05. WAXS studies of global molecular orientation induced in nematic liquid crystals by simple shear flow, J. A. Pople, G. R. Mitchell, Liq. Cryst. 1997, 23, 467
04. Coupling and memory in liquid crystal elastomers, G. R. Mitchell, P. M. S. Roberts, K. Ahn, F. J. Davis, C. Hasson, H. Hirschmann, J. A. Pople, Macromol. Symp. 1997, 117, 21
03. Flow behaviour of liquid crystal polymers as revealed by X-ray rheology, G. R. Mitchell, E. Andresen, P. A. Keates, J. A. Pople, Abs. Am. Chem. Soc. 1996, 211, 281
02. In-situ time resolving wide-angle X-ray scattering study of crystallization from sheared polyethylene melts, J. A. Pople, G. R. Mitchell, C. K. Chai, Polymer 1996, 37, 4187
01. Flow induced structures in polymer blends containing a liquid crystalline polymer, V. Tsakalos, P. Navard, E. Peuvrel-Disdier, P. Keates, J. Pople, G. R. Mitchell, Abs. Am. Chem. Soc. 1994, 208, 64