bz and gels

BZ and GelsYe Zhang

Bing Xu’s Group

Self-Walking Gel

Videos of Self-oscillating Gels

Malonic Acid (MA)

BrO3- Ru(bpy)3 HNO3/H2SO4H2O

Oxidant Catalyst

Gel

Build in

oscillation

BZ

Acid

BZ components :

Make Gel Oscillate in BZ

Self-Oscillating Gel

Gel

Polymeric Hydrogel

Supramolecular Hydrogel

Thermo-sensitive

Nonthermo-sensitive

Crosslinked

Uncrosslinked

Gel Types for Self-Oscillating Gel

Equilibrium swelling ratio of (NIPAm-co-Ru(bpy)3) gel under different conditions of reduced Ru(II) state (in Ce(III) solution) and oxidized Ru(III) state (in Ce(IV) solution).

NIPAm-co-Ru(bpy)3

Crosslinked Thermosensitive Polymeric Self-oscillating Gels

Development of Self-oscillating Gels

poly(NIPAm-co-Ru(bpy)y-co-AMPS) poly(NIPAm-co-Ru(bpy)y-co-MAPTAC)

poly(NIPAm-co-Ru(bpy)y-co-AMPS-co-MAPTAC)

Uncrosslinked Thermosensitive Polymeric Gels

Acid Free

Oxidant Free

Acid and Oxidant Free

poly-vinylpyrrolidone (PVP)

0.5Hz 50 oC <0.2% volume change0.03Hz 20 oC <0.5%volume change

Crosslinked Nonthermosensitive Polymeric Gels

Poly(VP-co-Ru(bpy)3) NIPAm-co-Ru(bpy)3

0.003Hz 20 oC 10-20% volume change

Control of Oscillation Behavior

Size-chemical waves Vs. volume change

Concentration of MA-switch on/off oscillation

Temperature-Oscillation frequency

Light illumination-Oscillation frequency

Molecular structure of catalyst

Thermo-Sensitive Polymer Based Self-Oscillatory Materials

Post Self-Assembly Crosslinking of Supramolecular Nanofbers

1

2

ConditionHydrogelator 4 mgWater 450 μLpH 7-8Ru complex 0.5 mg

60X

Supramolecular Hydrogel