*1.1. Design and Modification of a Rotary Furnace*

The quartz tube modification is shown in Figure S1. Two small quartz rod blades of Ø5 mm were oppositely attached to quartz tube.

**Figure S1.** Image (**left**) and sketch (**right**) of a new tube with baffles inside, created by adding two quartz rods inside the normal quartz tube.

In order to move the batch process to a continuous production, a continuous feeding system was designed using a 20 mL syringe piston feeder which was connected to a push type 'T' junction, as shown in Figure S2.

**Figure S2.** Sketch (**a**) and picture (**b**) of a new gas blow feeding system, to realise continuous feeding.

**Figure S3.** Sketch of the collection system, where (1) quartz tube and (2) housing are rotating while all other parts are kept still during action.

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The collection system makes the process a real continuous one, as shown in Figure S3. During the process, the quartz tube (1) and housing were driven to rotate by the motor, while the shaft (3) was kept static, as well as the gas outlet (4) and collection outlet (5 and 6) attached to it. Note that the product discharge outlet allows for easy isolation to collect samples for quality control during the manufacturing.
