I like #2 but try to incorporate a more obvious symbolization of absorption in the logo. How about the swoosh part of the "A" to start bold at the bottom and fade out as it approaches the tail. Or digitize the swoosh into small squares that start big and bold at the bottom and converge to smaller, lighter colored squares in the tail.
I like #4, especially the absorption symbolization in the "i" with the double squares. The signal line that appears like an EKG trace at the bottom of the logo is not relevant to this company.
I'm liking #25. Try fading the blue under the arc a little bit, say from the present medium blue color gradually to a lighter baby blue as the base of the letters are approached to clearly symbolize the effect of absorption.
Hence above the arch will be a solid dark blue as you have, then below the arch the blue fades more and more until the light baby blue reaches the base of the letters.
Getting close. I like the solid dark blue color above the arch as in #25 and #32. However below the arch, please fade from medium blue as in the bottom of the arch in #25 to a light baby blue as in bottom of the arch in #32. That is, the arch and top of the arch is a solid color, while below the arch the blue would fade from medium blue to baby blue. Although you used a fade in #33, I prefer fading only below the arch.
Getting very close with #35. Can you try fading a little more below the arch. The beginning dark blue is fine below the arch, but perhaps fade to a more lighter blue at the bottom. I want the logo to yell out "absorption".
Regarding item #2, I like the swoosh in the "A" but it needs to represent absorption. Please fade the swoosh where it is dark blue like the rest of the letters at the base, then fades to light baby blue at the top left tail of the swoosh.
Yes, #53 is looking great. Let's try fading the swoosh even more. How about the tail of the swoosh fading to the light blue color seen at the bottom of the logo in #32.