scholarly journals Atomic Force Microscopy Observations of the Polymer Network Structure Formed in Ferroelectric Liquid Crystals Cells

10.5772/46095 ◽  
2012 ◽  
Author(s):  
M. Petit
Keyword(s):  
Atomic Force Microscopy ◽  
Liquid Crystals ◽  
Network Structure ◽  
Polymer Network ◽  
Ferroelectric Liquid Crystals ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals The Mechanical Properties, Secondary Structure, and Osteogenic Activity of Photopolymerized Fibroin

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 646 ◽  
Author(s):  
Ivan Bessonov ◽  
Anastasia Moysenovich ◽  
Anastasia Arkhipova ◽  
Mariam Ezernitskaya ◽  
Yuri Efremov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Elasticity Modulus ◽  
Polymer Network ◽  
Beta Sheet ◽  
Ethanol Treatment ◽  
Force Microscopy ◽  
Osteogenic Activity ◽  
Atomic Force ◽  
Crystalline Domains

Previously, we have described the preparation of a novel fibroin methacrylamide (FbMA), a polymer network with improved functionality, capable of photocrosslinking into Fb hydrogels with elevated stiffness. However, it was unclear how this new functionality affects the structure of the material and its beta-sheet-associated crystallinity. Here, we show that the proposed method of Fb methacrylation does not disturb the protein’s ability to self-aggregate into the stable beta-sheet-based crystalline domains. Fourier transform infrared spectroscopy (FTIR) shows that, although the precursor ethanol-untreated Fb films exhibited a slightly higher degree of beta-sheet content than the FbMA films (46.9% for Fb-F-aq and 41.5% for FbMA-F-aq), both materials could equally achieve the highest possible beta-sheet content after ethanol treatment (49.8% for Fb-F-et and 49.0% for FbMA-F-et). The elasticity modulus for the FbMA-F-et films was twofold higher than that of the Fb-F-et as measured by the uniaxial tension (130 ± 1 MPa vs. 64 ± 6 MPa), and 1.4 times higher (51 ± 11 MPa vs. 36 ± 4 MPa) as measured by atomic force microscopy. The culturing of human MG63 osteoblast-like cells on Fb-F-et, FbMA-F-et-w/oUV, and FbMA-F-et substrates revealed that the photocrosslinking-induced increment of stiffness increases the area covered by the cells, rearrangement of actin cytoskeleton, and vinculin distribution in focal contacts, altogether enhancing the osteoinductive activity of the substrate.

scholarly journals A comparison of the network structure and inner dynamics of homogeneously and heterogeneously crosslinked PNIPAM microgels with high crosslinker content

Soft Matter ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 1053-1064 ◽  
Author(s):  
Judith Witte ◽  
Tetyana Kyrey ◽  
Jana Lutzki ◽  
Anna Margarethe Dahl ◽  
Judith Houston ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Network Structure ◽  
Force Microscopy ◽  
Structure And Dynamics ◽  
Atomic Force ◽  
Crosslinker Content

The network structure and dynamics of different PNIPAM microgels is studied with various scattering methods and atomic force microscopy.

Atomic force microscopy of ordered monolayer films from discotic liquid crystals

Langmuir ◽  
1993 ◽  
Vol 9 (8) ◽  
pp. 2141-2144 ◽  
Author(s):  
V. V. Tsukruk ◽  
D. H. Reneker ◽  
H. Bengs ◽  
H. Ringsdorf
Keyword(s):  
Atomic Force Microscopy ◽  
Liquid Crystals ◽  
Discotic Liquid Crystals ◽  
Monolayer Films ◽  
Force Microscopy ◽  
Atomic Force
Sign in / Sign up

Export Citation Format

Share Document