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30 results on '"Prince, Elisabeth"'

19. Patterning of Structurally Anisotropic Composite Hydrogel Sheets

Author

Prince, Elisabeth, Alizadehgiashi, Moien, Campbell, Melissa, Khuu, Nancy, Albulescu, Alexandra, De France, Kevin, Ratkov, Dimitrije, Li, Yunfeng, Hoare, Todd, and Kumacheva, Eugenia

Abstract

Compositional and structural patterns play a crucial role in the function of many biological tissues. In the present work, for nanofibrillar hydrogels formed by chemically crosslinked cellulose nanocrystals (CNC) and gelatin, we report a microextrusion-based 3D printing method to generate structurally anisotropic hydrogel sheets with CNCs aligned in the direction of extrusion. For such hydrogels, we prepared hydrogels with a uniform composition, as well as hydrogels with two different types of compositional gradients. In the first type of patterned hydrogel, the composition of the sheet varied parallel to the direction of CNC alignment. In the second hydrogel type, the composition of the sheet changed orthogonally to the direction of CNC alignment. The hydrogels exhibited gradients in structure, mechanical properties, and permeability, all governed by the compositional patterns, as well as cytocompatibility. These hydrogels have promising applications for both fundamental research and for tissue engineering and regenerative medicine.

Published
2024
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20. Chiral Carbon Dots Synthesized on Cellulose Nanocrystals.

Author

Chekini, Mahshid, Prince, Elisabeth, Zhao, Lily, Mundoor, Haridas, Smalyukh, Ivan I., and Kumacheva, Eugenia

Subjects
*CELLULOSE nanocrystals, *QUANTUM dot synthesis, *NANOMEDICINE, *CELL suspensions, *HYDROTHERMAL synthesis, *CELL culture, *CARBON
Abstract

Hybrid nanoparticles composed of cellulose nanocrystals (CNCs) and carbon‐dots (C‐dots) have promising applications in chemistry, biology, and nanomedicine, owing to the photoluminescence, sensory properties, and cytocompatibility of C‐dots, and chirality, cytobiocompatibility, and high cellular uptake of CNCs. The possibility of circularly polarized luminescence in such nanoparticles is particularly attractive. Herein, scalable and straightforward hydrothermal synthesis of nitrogen‐doped fluorescent C‐dots under reflux condition by using CNCs as a carbon source and chiral substrate is reported. Under ultraviolet irradiation, hybrid C‐dot/CNC nanoparticles exhibit stronger emission of left‐handed, than right‐handed, circularly polarized light, with high dissymmetry factor up to 0.2. The nanoparticles are biocompatible: the normalized proliferation index above 100% is determined for MCF 7 cells cultured in the suspension of C‐dot/CNC nanoparticles. These hybrid nanoparticles can find applications as biotags for labeling, sensing, and therapeutics and as building blocks of photoluminescent cholesteric CNC films with photonic applications. [ABSTRACT FROM AUTHOR]

Published
2020
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22. Patterning of Structurally Anisotropic Composite Hydrogel Sheets

Author

Prince, Elisabeth, primary, Alizadehgiashi, Moien, additional, Campbell, Melissa, additional, Khuu, Nancy, additional, Albulescu, Alexandra, additional, De France, Kevin, additional, Ratkov, Dimitrije, additional, Li, Yunfeng, additional, Hoare, Todd, additional, and Kumacheva, Eugenia, additional

Published
2018
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26. Colloidal cholesteric liquid crystal in spherical confinement

Author

Li, Yunfeng, primary, Jun-Yan Suen, Jeffrey, additional, Prince, Elisabeth, additional, Larin, Egor M., additional, Klinkova, Anna, additional, Thérien-Aubin, Héloïse, additional, Zhu, Shoujun, additional, Yang, Bai, additional, Helmy, Amr S., additional, Lavrentovich, Oleg D., additional, and Kumacheva, Eugenia, additional

Published
2016
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29. Periodic assembly of nanoparticle arrays in disclinations of cholesteric liquid crystals.

Author

Yunfeng Li, Prince, Elisabeth, Sangho Cho, Salari, Alinaghi, Golestani, Youssef Mosaddeghian, Lavrentovich, Oleg D., and Kumacheva, Eugenia

Subjects
*CHOLESTERIC liquid crystals, *HOMOGENEITY, *MOLECULAR self-assembly, *NANOPARTICLE synthesis, *COLLOID analysis
Abstract

An important goal of the modern soft matter science is to discover new self-assembly modalities to precisely control the placement of small particles in space. Spatial inhomogeneity of liquid crystals offers the capability to organize colloids in certain regions such as the cores of the topological defects. Here we report two self-assembly modes of nanoparticles in linear defects-disclinations in a lyotropic colloidal cholesteric liquid crystal: a continuous helicoidal thread and a periodic array of discrete beads. The beads form one-dimensional arrays with a periodicity that matches half a pitch of the cholesteric phase. The periodic assembly is governed by the anisotropic surface tension and elasticity at the interface of beads with the liquid crystal. This mode of self-assembly of nanoparticles in disclinations expands our ability to use topological defects in liquid crystals as templates for the organization of nanocolloids. [ABSTRACT FROM AUTHOR]

Published
2017
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30. Nanoparticle-laden droplets of liquid crystals: Interactive morphogenesis and dynamic assembly.

Author

Yunfeng Li, Khuu, Nancy, Prince, Elisabeth, Alizadehgiashi, Moien, Galati, Elizabeth, Lavrentovich, Oleg D., and Kumacheva, Eugenia

Subjects
*LIQUID crystals, *CHOLESTERIC liquid crystals, *DROPLETS, *MORPHOGENESIS, *LIQUID crystal states, *CONDENSED matter
Abstract

The article discusess a study conducted for achieving precise organization of nanoparticles (NPs) in three-dimensional space. It examines morphogenesis of nanoparticle assemblies and a cholesteric liquid crystalline host formed by cellulose nanocrystals for experiencing marked changes in shape and structure as a function of concentration. It mentions increase in NP loading triggers reversible droplet transformation to gain a core-shell morphology with an isotropic core.

Published
2019
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