2021-05-252021-05-252021-02-09Rahman, Muhammad M., Sajadi, Seyed Mohammad, Kumar, Ashok, Boul, Peter J., Thaemlitz, Carl and Ajayan, Pulickel M., "Cement-based direct ink for 3D printing of complex architected structures." Patent US10913683B2. issued 2021-02-09. Retrieved from <a href="https://hdl.handle.net/1911/110640">https://hdl.handle.net/1911/110640</a>.https://hdl.handle.net/1911/110640Provide is a cement ink for a cement ink for 3D printing (which also includes additive manufacturing) of 3D cement structures and materials. The cement ink includes an American Petroleum Institute (API) Class G cement, a nano-clay, a superplasticizer, a hydroxyethyl cellulose, and a defoamer. The nano-clay may be hydrophilic bentonite. The superplasticizer may be a polycarboxylate ether. The defoamer may be 2-ethyl-1-hexanol. Processes for forming the cement ink and printing 3D cement structures using the cement ink are also provided.11engUtility patentUS10913683B2