The micro compounder DSM Xplore 5cc is an extruder machine for developing nanocomposites. One of the biggest differences with the usual extruders is the amount of material needed. This particular machine can process 5 ml per batch, and therefore, only a pinch of the expensive nano-material filler is needed to run tests.
The equipment consists in a conical twin-screw extruder which can be operated in batch and continuous modes ensured by a recirculation channel and a control valve built into the barrel. Among its main characteristics, the machine can work at a maximum of 400 RPM and 350 °C.
The role of water in carbon feed on the surface-guided growth of horizontally aligned single-walled carbon
nanotubes (HA-SWCNTs) was investigated. It is shown that the amount of water can be optimized to favor HA-SWCNT growth, which is proposed to be due to selective etching of carbon deposits at carbon–metal interface. Without water, nanotube–nanotube interaction and carbon accumulation at the interface are disproportionately large compared to the rate of nanotube growth, leading to catalyst deactivation. With excess water, suppression of nanotube growth occurs, resulting in reduced carbon yield on the surface.
Intermediate carbon/water feed ratios achieve cleaner growth with high efficiency.