Abstract: The method can include depositing a graphene oxide containing material from solution to form a laminar nano-structure of graphene oxide paper, and assembling at least a portion of the graphene oxide paper as a diaphragm of the acoustic transducer. The acoustic transducer can be a magnetic induction based microphone, a diaphragm loudspeaker, or a magnetic induction based loudspeaker, for instance.

Abstract: Materials used in acoustic transducer membranes need very specific qualities that in any real system require many tradeoffs to be made. Graphene and graphene related materials are a newly discovered class of materials with some exceptional properties that offer the potential for significant contributions to the performance of many acoustical transduction systems. Accordingly the inventors have established graphene oxide based transducers as the basis of ribbon microphones and diaphragm loudspeakers using low cost manufacturing and processing techniques.

Abstract: The invention relates to a method of improving acceptability of black coffee with young people. The method includes incorporating a plant flavor which is complementary to the coffee taste in an un-whitened soluble coffee powder and to the resulting product made by the method. In one embodiment, the soluble coffee beverage includes a plant flavor that initially provides a tea taste, but which subsequently gives away to a coffee taste in the mouth during consumption. The invention also relates to a coffee concentrate of this soluble coffee powder, and to coffee drinks or beverages made from same.