Feb 232015
 

This blog post was written by, and highlights the Fall 2014 final project of, EMAC undergraduate student Justin Ozuna. Follow him on Twitter @TheOzunaVerse. The assignment for which he made the project can be found here.

Pet ownership is a way of life in the United States. According to humanesociety.org, more than 80 million dogs are pets in U.S. households. Eighty million! For perspective, there are an estimated 316 million people living in the United States. Nearly 47 percent of households own at least one dog, and the upward trend doesn’t show any signs of decline in the near future. In fact, pet ownership has nearly tripled since the 1970s.

Where there are numbers, there is a thriving industry. Americans will spend $58 billion on all pets combined this year. Walk into any store and there’s likely to be an aisle (or two) of pet food, snacks, toys and accessories. What you won’t be able to buy in the store, however, is time. After a long day of work and a full schedule of evening activities, Fido is ready for a long walk. The problem is that there’s not always time to take your pet for a stroll in the neighborhood before the sun goes down and the stars fill the sky. Walking your pet at night means you’re at the mercy of overcautious drivers and hyper-focused neighbors to stay safe.

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Oct 202014
 

By: Ariana Berdy

Imprint Energy is a company that was started by Christine Ho following her graduate studies at the University of California, Berkley. Collaborating with a researcher in Japan, Ho produced 3D printed zinc batteries. Now, her work has evolved. Her company, Imprint Energy, produces flexible printed zinc batteries. Unlike the design of previous and standard lithium batteries, Imprint Energy’s zinc batteries are safe, flexible, and smaller than the preceding design.

Most typical batteries are made using lithium as the primary charging component. However, lithium is highly reactive and very unstable. Primarily, lithium is oxygen-sensitive. In order for workers to handle it safely, protective equipment is required. To adequately seal the reactive lithium requires many protective layers. The result is a rigid, bulky, and limiting battery design.

While zinc has been used in batteries for years it was not possible to make zinc batteries rechargeable. In previous batteries, zinc was combined with a liquid electrolyte. Over time this combination produced dendrites, which are tiny fibers that grow and prevent the charging reaction from taking place. As a part of her graduate studies, Ho developed a solid polymer electrolyte that avoided dendrites. She combined this new polymer with zinc to create Imprint Energy’s battery. Because of zinc’s environmental stability, Imprint Energy’s batteries do not require heavy and rigid insulation. Additionally they are cheaper to manufacture and do not require workers to wear protective equipment.

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