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The results show that a thorough mixing of the metal solution and the methenamine and urea mixture in a microfluidic mixer can be achieved in tens of milliseconds by either winding the mixing channel to create secondary flows or splitting the solutions inlets to yield additional diffusion interfaces .
 mixing, metal, methenamine, urea, microfluidic mixer, be, winding, mixing channel, secondary flows, inlets, diffusion interfaces
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 mixing, metal, methenamine, urea, microfluidic mixer, be, winding, mixing channel, secondary flows, inlets, diffusion interfaces