Monolithic mesophase polymer membrane templated from ternary hexagonal lyotropic liquid crystal system PhD Candidate: Guang WANG Supervisors: Lingxue Kong.

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Presentation transcript:

Monolithic mesophase polymer membrane templated from ternary hexagonal lyotropic liquid crystal system PhD Candidate: Guang WANG Supervisors: Lingxue Kong (Deakin University) Chris Garvey (ANSTO) Maria Forsyth (Deakin University)

Background of my PhD project

Poly(ethylene glycol) diacrylate (PEGDA) 2-Hydroxyethyl methacrylate (HEMA) Monomers: Structure directing agent: Dodecyltrimethylammonium bromide (DTAB) Chemicals Water Ratio of DTAB 1,6-Hexanediol diacrylate (HDDA)

Alignment experiment under electric field Equilibration Heating up Transition temperature Cooling down Room temperature A B C 12 h

Hexagonal LLCs without monomer-Complex viscosity and DSC Binary system of DTAB and water stable to temperature σ= 10 Pa, ω=10 rad/s

Effect of monomers on hexagonal lyotropic liquid crystal mesophase (LLCs)-Polarized light microscopy (PLM) 30 ℃ 70 ℃ 60 ℃ 80 ℃ 55 ℃ 50 ℃ 30 ℃ PLM images of ternary system of DTAB, Water and PEGDA Increasing Decreasing

PLM images of ternary system of DTAB, Water and hydrophilic HEMA 25 ℃ 42 ℃ 38 ℃ 35 ℃ 30 ℃ 35 ℃ 40 ℃ Effect of monomers on hexagonal (LLCs)-PLM Increasing Decreasing

Effect of monomers on hexagonal LLCs-Complex Viscosity σ= 10 Pa, ω=10 rad/s

Effect of monomers on hexagonal LLCs-DSC

Phase transition temperature (T t ) from hexagonal to isotropic micellar phase observed after adding monomers and T t varies depend on the monomer and its ratio T t Decreased from about 70 ℃ to about 42 ℃ when PEGDA replaced with HEMA gradually The transition is reversible Conclusions Where Monomer sits ? Structure retention Membrane fabrication Membrane properties

SLD calculation and contrast variation Contrast variation D 2 O ratio08%100% Tail-deuterated DTAB (D 25 -DTAB) 05.3%100% Fully-deuterated DTAB (D 34 -DTAB) 03.2%100% 21% for PEGDA 22% for HEMA

1D SANS pattern after contrast variation

Structure factor calculation vs contrast variation

Gauss fitting and integral peaks D 25 -DTAB+ (H 2 O+D 2 O) Wide Bragg peaks Inaccurate peak structure factor calculation Δλ/λ 10%

Future works: V1 membrane diffractometer in Germany ( in September ) BILBY in Australia (Proposal submitted) Longer collimation system to obtain more uniform wavelength Wavelength resolution within range between 4% and 30%

Hexagonal Phase  Two dimensional Fourier series where: Harper, P. E., D. A. Mannock, et al. (2001). "X-ray diffraction structures of some phosphatidylethanolamine lamellar and inverted hexagonal phases." Biophysical Journal 81:

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