SINGAPORE -- André Stoltz calls his company's feature product a "super-absorbent" sponge: a carbon-fiber filter made from recycled paper and cotton that can suck oil or industrial contaminants out of water. The company, EcoWorth, a start-up spun out of the National University of Singapore three years ago, has so far raised around $1 million through grants, angel investments and bootstrapping to help commercialize its 'carbon fiber aerogel' technology.