Confusedstudent

Hi I'm currently at university and have a set of results for an experiment which involved polycaprolactone particles treated with sodium hydroxide. Size range 10-30 micrometres. Buffer PBS. I found the zeta potential to be roughly 5mV. But with NaOH treatment and PCL i expected results to be negative. I am so confused, can anyone please help or refer me to where I can get help? Thanks

ones composed of polymer microparticles coated in thermoresponsive polymers

Not sure if have written this is right place, but does anybody know why stronger gels are more brittle? I have read this fact in many places but no explanation for it!! Any help would be soo appreciated