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208 results on '"Wetzel, Eric D"'

2. An Irreversible Synthetic Route to an Ultra-Strong Two-Dimensional Polymer

Author

Zeng, Yuwen, Gordiichuk, Pavlo, Ichihara, Takeo, Zhang, Ge, Gong, Xun, Emil, Sandoz-Rosado, Wetzel, Eric D., Tresback, Jason, Yang, Jing, Yang, Zhongyue, Kozawa, Daichi, Kuehne, Matthias, Liu, Pingwei, Liu, Albert Tianxiang, Yang, Jingfan, Kulik, Heather J., and Strano, Michael S.

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science
Abstract

Polymers that extend covalently in two dimensions have attracted recent attention as a means of combining the mechanical strength and in-plane energy conduction of conventional two-dimensional (2D) materials with the low densities, synthetic processability, and organic composition of their one-dimensional counterparts. Efforts to date have proven successful in forms that do not allow full realization of these properties, such as polymerization at flat interfaces or fixation of monomers in immobilized lattices. A frequently employed synthetic approach is to introduce microscopic reversibility, at the cost of bond stability, to achieve 2D crystals after extensive error correction. Herein we demonstrate a synthetic route to 2D irreversible polycondensation directly in the solution phase, resulting in covalently bonded 2D polymer platelets that are chemically stable and highly processable. Further fabrication offers highly oriented, free-standing films which exhibit exceptional 2D elastic modulus and yield strength at 50.9 +- 15.0 GPa and 0.976 +- 0.113 GPa, respectively. Platelet alignment is evidenced by polarized photoluminescence centered at 580 and 680 nm from different dipole transitions. This new synthetic route provides opportunities for 2D polymers in applications ranging from composite structures to molecular sieving membranes., Comment: 13 pages, 4 figures

Published
2021

5. Irreversible synthesis of an ultrastrong two-dimensional polymeric material

Author

Zeng, Yuwen, Gordiichuk, Pavlo, Ichihara, Takeo, Zhang, Ge, Sandoz-Rosado, Emil, Wetzel, Eric D., Tresback, Jason, Yang, Jing, Kozawa, Daichi, Yang, Zhongyue, Kuehne, Matthias, Quien, Michelle, Yuan, Zhe, Gong, Xun, He, Guangwei, Lundberg, Daniel James, Liu, Pingwei, Liu, Albert Tianxiang, Yang, Jing Fan, Kulik, Heather J., and Strano, Michael S.

Published
2022
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44. A Personnel Launch System for safe and efficient manned operations

Author

Petro, Andrew J, Andrews, Dana G, and Wetzel, Eric D

Subjects
Launch Vehicles And Space Vehicles
Abstract

Several Conceptual designs for a simple, rugged Personnel Launch System (PLS) are presented. This system could transport people to and from Low Earth Orbit (LEO) starting in the late 1990's using a new modular Advanced Launch System (ALS) developed for the Space Exploration Initiative (SEI). The PLS is designed to be one element of a new space transportation architecture including heavy-lift cargo vehicles, lunar transfer vehicles, and multiple-role spcecraft such as the current Space Shuttle. The primary role of the PLS would be to deliver crews embarking on lunar or planetary missions to the Space Station, but it would also be used for earth-orbit sortie missions, space rescue missions, and some satellite servicing missions. The PLS design takes advantage of emerging electronic and structures technologies to offer a robust vehicle with autonomous operating and quick turnaround capabilities. Key features include an intact abort capability anywhere in the operating envelope, and elimination of all toxic propellants to streamline ground operations.

Published
1990

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