Chiral graphene materials for enantiomer separation

Cheng, Qingsong; Pei, Hebing; Ma, Qian; Guo, Ruibin; Liu, Nijuan; Mo, Zunli

doi:10.1016/j.cej.2022.139499

Cited by 29 publications

(15 citation statements)

References 191 publications

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“…At present, the chiral membrane materials which have been widely studied and promising mainly include polymer materials, organic framework materials, and inorganic nanomaterials. [39][40][41][42][43][44]…”

Section: Chiral Membrane Materialsmentioning

confidence: 99%

Enantioseparation Membranes: Research Status, Challenges, and Trends

Cheng

Pei

et al. 2023

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The purity of enantiomers plays a critical role in human health and safety. Enantioseparation is an effective way and necessary process to obtain pure chiral compounds. Enantiomer membrane separation is a new chiral resolution technique, which has the potential for industrialization. This paper mainly summarizes the research status of enantioseparation membranes including membrane materials, preparation methods, factors affecting membrane properties, and separation mechanisms. In addition, the key problems and challenges to be solved in the research of enantioseparation membranes are analyzed. Last but not least, the future development trend of the chiral membrane is expected.

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Section: Chiral Membrane Materialsmentioning

confidence: 99%

Enantioseparation Membranes: Research Status, Challenges, and Trends

Cheng

Pei

et al. 2023

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“…Graphene, in its pristine form, is a particularly interesting 2D material because of its unique band structure, high carrier mobility, and ability to show various quantum transport phenomena even at room temperature. , From the viewpoint of spintronics, room-temperature spin transport and micron-scale spin relaxation length in pristine graphene layers have been reported. , Such features originate due to the weak intrinsic spin–orbit interaction of graphene and the weak hyperfine interaction of electron spin with carbon nuclei, which suppress the spin relaxation mechanisms. On the other hand, it has been reported that various chiral organic molecules can impart chirality to various graphene derivatives such as graphene oxide (GO) and reduced (or deoxygenated) graphene oxide (rGO) via covalent as well as noncovalent interactions including hydrophobic effect, π–π stacking, electrostatic effect, etc. − In most cases, the chirality of the resultant hybrid materials originates from the chirality of the attached moiety. These have been classified as “configurational chirality” (originating from small chiral molecules), “conformational chirality” (due to helical polymers), or “hierarchical chirality” (due to chiral liquid crystal structures) .…”

Section: Introductionmentioning

confidence: 99%

“…The molecules attach with the edges of the graphene flakes and induce “structural chirality” in the form of helical buckling of the flakes. Several application areas of chiral graphene have been explored by the above studies, which include chiral catalysis, chiral separation and recognition, ,, enantioselective sensing, , etc. Use of GO and rGO in these studies is motivated by the fact that they are amenable to chiral functionalization via chemical means, and chiral graphene can be generated in large quantities via solution processing, which is difficult to achieve using pristine graphene.…”

Section: Introductionmentioning

confidence: 99%

Chirality-Induced Spin Selectivity in Supramolecular Chirally Functionalized Graphene

Firouzeh,

Illescas-Lopez,

Hossain

et al. 2023

ACS Nano

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Chiral graphene hybrid materials have attracted significant attention in recent years due to their various applications in the areas of chiral catalysis, chiral separation and recognition, enantioselective sensing, etc. On the other hand, chiral materials are also known to exhibit chirality-dependent spin transmission, commonly dubbed “chirality induced spin selectivity” or CISS. However, CISS properties of chiral graphene materials are largely unexplored. As such, it is not clear whether graphene is even a promising material for the CISS effect given its weak spin–orbit interaction. Here, we report the CISS effect in chiral graphene sheets, in which a graphene derivative (reduced graphene oxide or rGO) is noncovalently functionalized with chiral Fmoc-FF (Fmoc-diphenylalanine) supramolecular fibers. The graphene flakes acquire a “conformational chirality” postfunctionalization, which, combined with other factors, is presumably responsible for the CISS signal. The CISS signal correlates with the supramolecular chirality of the medium, which depends on the thickness of graphene used. Quite interestingly, the noncovalent supramolecular chiral functionalization of conductive materials offers a simple and straightforward methodology to induce chirality and CISS properties in a multitude of easily accessible advanced conductive materials.

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“…A chiral molecule refers to a molecule with a certain conguration or conformation that is different from its mirror image and cannot overlap with each other. The enantiomers of chiral molecules generally have similar chemical structures and physical properties, 8 but they oen show completely different effects in organisms. [9][10][11] Chiral structures have a very wide range of applications in optics, [12][13][14][15] and chirality regulation plays a very important role.…”

Section: Introductionmentioning

confidence: 99%