Ruiqi Dong
@upenn.edu
University of Pennsylvania
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Lauren N. Bodkin, Zachary A. Krajnak, Ruiqi Dong, Chinedum O. Osuji, and Douglas L. Gin
Royal Society of Chemistry (RSC)
Correction for ‘Cross-linkable, phosphobetaine-based, zwitterionic amphiphiles that form lyotropic bicontinuous cubic phases’ by Lauren N. Bodkin et al., Soft Matter, 2023, 19, 3768–3772, https://doi.org/10.1039/D3SM00269A.
Ruiqi Dong and Gui-shuang Ying
Elsevier BV
Lauren N. Bodkin, Zachary A. Krajnak, Ruiqi Dong, Chinedum O. Osuji, and Douglas L. Gin
Royal Society of Chemistry (RSC)
Two new, cross-linkable, phosphobetaine zwitterionic amphiphiles were found to form a type II bicontinuous cubic (QII) phase with aq. NH4Cl. Upon polymerization, they form 3D-nanoporous membrane materials that are not susceptible to ion exchange.
Ruiqi Liang, Yazhen Xue, Xiaowei Fu, An N. Le, Qingliang Song, Yicheng Qiang, Qiong Xie, Ruiqi Dong, Zehao Sun, Chinedum O. Osuji,et al.
Springer Science and Business Media LLC
Yizhou Zhang, Dahin Kim, Ruiqi Dong, Xunda Feng, and Chinedum O. Osuji
American Association for the Advancement of Science (AAAS)
Organic solvent–stable membranes exhibiting strong selectivity and high permeance have the potential to transform energy utilization in chemical separation processes. A key goal is developing materials with uniform, well-defined pores at the 1-nm scale, with sizes that can be tuned in small increments with high fidelity. Here, we demonstrate a class of organic solvent–stable nanoporous membranes derived from self-assembled liquid crystal mesophases that display such characteristics and elucidate their transport properties. The transport-regulating dimensions are defined by the mesophase geometry and can be controlled in increments of ~0.1 nm by modifying the chemical structure of the mesogen or the composition of the mesophase. The highly ordered nanostructure affords previously unidentified opportunities for the systematic design of organic solvent nanofiltration membranes with tailored selectivity and permeability and for understanding and modeling rejection in nanoscale flows. Hence, these membranes represent progress toward the goal of enabling precise organic solvent nanofiltration.
Joël Monti, Alberto Concellón, Ruiqi Dong, Mira Simmler, Alexander Münchinger, Christian Huck, Petra Tegeder, Hermann Nirschl, Martin Wegener, Chinedum O. Osuji,et al.
American Chemical Society (ACS)
Nanoporous materials relying on supramolecular liquid crystals (LCs) are excellent candidates for size- and charge-selective membranes. However, whether they can be manufactured using printing technologies remained unexplored so far. In this work, we develop a new approach for the fabrication of ordered nanoporous microstructures based on supramolecular LCs using two-photon laser printing. In particular, we employ photo-cross-linkable hydrogen-bonded complexes, that self-assemble into columnar hexagonal (Colh) mesophases, as the base of our printable photoresist. The presence of photopolymerizable groups in the periphery of the molecules enables the printability using a laser. We demonstrate the conservation of the Colh arrangement and of the adsorptive properties of the materials after laser microprinting, which highlights the potential of the approach for the fabrication of functional nanoporous structures with a defined geometry. This first example of printable Colh LC should open new opportunities for the fabrication of functional porous microdevices with potential application in catalysis, filtration, separation, or molecular recognition.
Uri R. Gabinet, Changyeon Lee, Ryan Poling-Skutvik, Daniel Keane, Na Kyung Kim, Ruiqi Dong, Zachariah Vicars, Yusheng Cai, Aniket U. Thosar, Alexander Grun,et al.
American Chemical Society (ACS)
Atomically thin MoS2 nanosheets are of interest due to unique electronic, optical, and catalytic properties that are absent in the bulk material. Methods to prepare nanosheets from bulk material th...
Yizhou Zhang, Ruiqi Dong, Uri R. Gabinet, Ryan Poling-Skutvik, Na Kyung Kim, Changyeon Lee, Omar Q. Imran, Xunda Feng, and Chinedum O. Osuji
American Chemical Society (ACS)
Nanostructured materials with precisely defined and water-bicontinuous 1-nm-scale pores are highly sought after as advanced materials for next-generation nanofiltration membranes. While several self-assembled systems appear to satisfy this need, straightforward fabrication of such materials as submicron films with high-fidelity retention of their ordered nanostructure represents a nontrivial challenge. We report the development of a lyotropic liquid crystal mesophase that addresses the aforementioned issue. Films as thin as ∼200 nm are prepared on conventional support membranes using solution-based methods. Within these films, the system is composed of a hexagonally ordered array of ∼3 nm diameter cylinders of cross-linked polymer, embedded in an aqueous medium. The cylinders are uniformly oriented in the plane of the film, providing a transport-limiting dimension of ∼1 nm, associated with the space between the outer surfaces of nearest-neighbor cylinders. These membranes exhibit molecular weight cutoffs of ∼300 Da for organic solutes and are effective in rejecting dissolved salts, and in particular, divalent species, while exhibiting water permeabilities that rival or exceed current state-of-the-art commercial nanofiltration membranes. These materials have the ability to address a broad range of nanofiltration applications, while structure-property considerations suggest several avenues for potential performance improvements.