A version of this article first appeared in CNBC's Inside Wealth newsletter with Robert Frank, a weekly guide to the high-net-worth investor and consumer. Sign up to receive future editions, straight to your inbox. Starwood Capital's Barry Sternlicht made his multibillion-dollar fortune in real estate. Now he is betting on nuclear batteries through his family office, Jaws Ventures, joining a $50 million fundraise for Zeno Power in May. The startup's microwave-sized batteries provide years of energy in remote environments like deep space and the seabed by using heat from nuclear waste. The U.S. Department of Defense and NASA are customers. The Jaws investment comes as family offices have dialed back their dealmaking due to economic uncertainty, making 41 direct investments in May, down near

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