Friction-induced surface textures of liquid crystalline polymer evaluated by atomic force microscopy, spectroscopy and nanoindentation

2018 ◽  
Vol 68 ◽  
pp. 146-152 ◽  
Author(s):  
Fanglin Xu ◽  
Yuanshi Xin ◽  
Tongsheng Li
Keyword(s):  
Atomic Force Microscopy ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Surface Textures ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Hierarchical Characterization and Nanomechanical Assessment of Biomimetic Scaffolds Mimicking Lamellar Bone via Atomic Force Microscopy Cantilever-Based Nanoindentation

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1257 ◽  
Author(s):  
Brian Wingender ◽  
Yongliang Ni ◽  
Yifan Zhang ◽  
Curtis Taylor ◽  
Laurie Gower
Keyword(s):  
Mechanical Properties ◽  
Atomic Force Microscopy ◽  
Hierarchical Structure ◽  
Liquid Crystalline ◽  
Structural Motif ◽  
Positive Trend ◽  
Bovine Bone ◽  
Lamellar Bone ◽  
Force Microscopy ◽  
Atomic Force

The hierarchical structure of bone and intrinsic material properties of its two primary constituents, carbonated apatite and fibrillar collagen, when being synergistically organized into an interpenetrating hard-soft composite, contribute to its excellent mechanical properties. Lamellar bone is the predominant structural motif in mammalian hard tissues; therefore, we believe the fabrication of a collagen/apatite composite with a hierarchical structure that emulates bone, consisting of a dense lamellar microstructure and a mineralized collagen fibril nanostructure, is an important first step toward the goal of regenerative bone tissue engineering. In this work, we exploit the liquid crystalline properties of collagen to fabricate dense matrices that assemble with cholesteric organization. The matrices were crosslinked via carbodiimide chemistry to improve mechanical properties, and are subsequently mineralized via the polymer-induced liquid-precursor (PILP) process to promote intrafibrillar mineralization. Neither the crosslinking procedure nor the mineralization affected the cholesteric collagen microstructures; notably, there was a positive trend toward higher stiffness with increasing crosslink density when measured by cantilever-based atomic force microscopy (AFM) nanoindentation. In the dry state, the average moduli of moderately (X51; 4.8 ± 4.3 GPa) and highly (X76; 7.8 ± 6.7 GPa) crosslinked PILP-mineralized liquid crystalline collagen (LCC) scaffolds were higher than the average modulus of bovine bone (5.5 ± 5.6 GPa).

Annealing effects on the electrical conductivity of polymerized liquid crystalline 3,4-ethylenedioxythiophene derivatives

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Noelle Wrubbel ◽  
Helmut Ritter ◽  
Knud Reuter ◽  
Alexander Karbach ◽  
Doris Drechsler
Keyword(s):  
Electrical Conductivity ◽  
Atomic Force Microscopy ◽  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Electrically Conductive ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Annealing Effects

Abstract3,4-Ethylenedioxythiophene derivatives with aromatic, in most cases mesogenic, side groups were synthesized and their liquid crystal behaviour was characterized. These monomers were polymerized oxidatively to charged, electrically conductive polythiophenes. X-ray and atomic force microscopy studies were performed. Films of theses polythiophenes achieved via in situ polymerization were prone to a significant increase of the conductivity by annealing.

Atomic Force Microscopy Study of Structural Organization of Carbosilane Liquid Crystalline Dendrimer

Langmuir ◽  
2000 ◽  
Vol 16 (12) ◽  
pp. 5487-5493 ◽  
Author(s):  
S. A. Ponomarenko ◽  
N. I. Boiko ◽  
V. P. Shibaev ◽  
S. N. Magonov
Keyword(s):  
Atomic Force Microscopy ◽  
Liquid Crystalline ◽  
Structural Organization ◽  
Microscopy Study ◽  
Atomic Force Microscopy Study ◽  
Force Microscopy ◽  
Atomic Force

Advances in microscopy of polymers: A FESEM and STM study

1991 ◽  
Vol 49 ◽  
pp. 1042-1043
Author(s):  
R.T. Chen ◽  
M.G. Jamieson
Keyword(s):  
Field Emission ◽  
Liquid Crystalline ◽  
Low Voltage ◽  
Polymeric Materials ◽  
Crystalline Polymer ◽  
Scanning Tunneling ◽  
Force Microscopy ◽  
Atomic Force ◽  
Microscopy Techniques

Microscopy has played a major role in establishing structure-process-property relationships in the research and development of polymeric materials. With advances in electron microscopy instrumentation (e.g., field emission SEM - FESEM) and the invention of new scanning probe microscopes (e.g., scanning tunneling microscope - STM), resolution of structures or morphologies down to the nanometer scale can be achieved with ease. This paper will focus on the application of FESEM and STM in order to understand the structure of commercial polymeric materials. Characterization of polymers using other microscopy techniques such as TEM, thermal optical microscopy and atomic force microscopy (AFM) will also be discussed.The polymeric materials evaluated in this study include membranes, liquid crystalline polymer (LCP) fibers, multiphase polymer blends and polymer films or coatings. In order to minimize beam damage and maximize contrast for surface detail in beam sensitive polymers, low voltage SEM (LVSEM) was performed on a JEOL 840F field emission SEM.

Atomic Force Microscopy Study of Hydroxypropylcellulose Films Prepared from Liquid Crystalline Aqueous Solutions

2002 ◽  
Vol 35 (15) ◽  
pp. 5932-5936 ◽  
Author(s):  
M. H. Godinho ◽  
J. G. Fonseca ◽  
A. C. Ribeiro ◽  
L. V. Melo ◽  
P. Brogueira
Keyword(s):  
Atomic Force Microscopy ◽  
Aqueous Solutions ◽  
Liquid Crystalline ◽  
Microscopy Study ◽  
Atomic Force Microscopy Study ◽  
Force Microscopy ◽  
Atomic Force
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