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  • Users: redclouds
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  1. redclouds

    how to make 2D colloidal crystal films

    Dear all, I am desperately seeking for information regarding to how to make a large area of 2D colloidal crystal films (i.e. spheres in closed packing). This is generally the first step of nanospheres lithography. As reported in many references, I am also using spin coating technique. But the...
  2. redclouds

    can AFM characterize surface with micron-sized features

    My sample surface is featured with microspheres (0.3um-1.5um). Can I use AFM to characterize the surface? I know AFM is very good for nano-topography but not sure with my case. I have tried to use AFM with my sample one time. But the singal is very bad. Since I am a new user of AFM, I am not...
  3. redclouds

    how to separate particles

    I have glass microspheres which are in wide size distribution, i.e. 10-100um. Do you have any way to separate the large ones from small ones since I want to narrow the size distribution? Any suggestion is appreciated.
  4. redclouds

    contact angle measurement

    I met a problem when measuring contact angle of water drop on my sample. Since my sample is very hydrophobic, the water drop prefer staying with the disposing needle to standing on my sample surface. If I increase the water volumn until 8ul, the water fall down on the surface due to gravity. but...

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