Figure 3.

Inner sacrificial materials removal with three removers. (a–d) Inject air into the heating chip and take pictures at the (a) inlet, (b) front part, (c) rear part, and (d) outlet under the microscope. (e–h) Inject ethanol into a hot bath with the chip and take pictures at the (e) inlet, (f) front part, (g) rear part, and (h) outlet under the microscope. (i–l) Inject vegetable oil into a hot bath with the chip and take pictures at the (i) inlet, (j) front part, (k) rear part, and (l) outlet under the microscope. (m–p) Transmittance results at the (m) inlet, (n) front part, (o) rear part, and (p) outlet after processing by air, ethanol, and vegetable oil. The scale bar is 1 mm.