scholarly journals Nerve Response to Superelastic Shape Memory Polyurethane Aerogels

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2995
Author(s):  
Martina Rodriguez Sala ◽  
Omar Skalli ◽  
Nicholas Leventis ◽  
Firouzeh Sabri
Keyword(s):  
Surface Roughness ◽  
Shape Memory ◽  
Pore Diameter ◽  
Average Length ◽  
Neuronal Cells ◽  
Optimum Combination ◽  
Physical Parameters ◽  
Radial Compression ◽  
Nerve Response ◽  
Shape Memory Polyurethane

We have previously shown the suitability of aerogels as scaffolds for neuronal cells. Here, we report on the use of superelastic shape memory polyurethane aerogels (SSMPA). SSMPA have a distinctly different stiffness than previously reported aerogels. The soft and deformable nature of SSMPA allowed for radial compression of the aerogel induced by a custom designed apparatus. This radial compression changed the pore diameter and surface roughness (Sa) of SSMPA, while maintaining similar stiffness. Two varieties of SSMPA were used, Mix-14 and Mix-18, with distinctly different pore diameters and Sa. Radial compression led to a decreased pore diameter, which, in turn, decreased the Sa. The use of custom designed apparatus and two types of SSMPA allowed us to examine the influence of stiffness, pore size, and Sa on the extension of processes (neurites) by PC12 neuronal cells. PC12 cells plated on SSMPA with a higher degree of radial compression extended fewer neurites per cell when compared to other groups. However, the average length of the neurites was significantly longer when compared to the unrestricted group and to those extended by cells plated on SSMPA with less radial compression. These results demonstrate that SSMPA with 1.9 µm pore diameter, 1.17 µm Sa, and 203 kPa stiffness provides the optimum combination of physical parameters for nerve regeneration.

Three-dimensional Graphene Coated Shape Memory Polyurethane Foam with Fast Responsive Performance

2021 ◽  
Author(s):  
Tianjiao Wang ◽  
Jun Zhao ◽  
Chuanxin Weng ◽  
Tong Wang ◽  
Yayun Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Practical Applications ◽  
External Stimuli ◽  
Shape Memory Polyurethane

Shape memory polymers (SMPs) that change shapes as designed by external stimuli have become one of the most promising materials as actuators, sensors, and deployable devices. However, their practical applications...

scholarly journals Key Properties of a Bioactive Ag-SiO2/TiO2 Coating on NiTi Shape Memory Alloy as Necessary at the Development of a New Class of Biomedical Materials

2021 ◽  
Vol 22 (2) ◽  
pp. 507
Author(s):  
Mateusz Dulski ◽  
Robert Gawecki ◽  
Sławomir Sułowicz ◽  
Michal Cichomski ◽  
Alicja Kazek-Kęsik ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Dermal Fibroblast ◽  
Niti Alloy ◽  
Bacterial Biofilm ◽  
Niti Shape Memory Alloy ◽  
Normal Human Dermal Fibroblast ◽  
Water Contact ◽  
Nano Coating

Recent years have seen the dynamic development of methods for functionalizing the surface of implants using biomaterials that can mimic the physical and mechanical nature of native tissue, prevent the formation of bacterial biofilm, promote osteoconduction, and have the ability to sustain cell proliferation. One of the concepts for achieving this goal, which is presented in this work, is to functionalize the surface of NiTi shape memory alloy by an atypical glass-like nanocomposite that consists of SiO2-TiO2 with silver nanoparticles. However, determining the potential medical uses of bio(nano)coating prepared in this way requires an analysis of its surface roughness, tribology, or wettability, especially in the context of the commonly used reference coat-forming hydroxyapatite (HAp). According to our results, the surface roughness ranged between (112 ± 3) nm (Ag-SiO2)—(141 ± 5) nm (HAp), the water contact angle was in the range (74.8 ± 1.6)° (Ag-SiO2)—(70.6 ± 1.2)° (HAp), while the surface free energy was in the range of 45.4 mJ/m2 (Ag-SiO2)—46.8 mJ/m2 (HAp). The adhesive force and friction coefficient were determined to be 1.04 (Ag-SiO2)—1.14 (HAp) and 0.247 ± 0.012 (Ag-SiO2) and 0.397 ± 0.034 (HAp), respectively. The chemical data showed that the release of the metal, mainly Ni from the covered NiTi substrate or Ag from Ag-SiO2 coating had a negligible effect. It was revealed that the NiTi alloy that was coated with Ag-SiO2 did not favor the formation of E. coli or S. aureus biofilm compared to the HAp-coated alloy. Moreover, both approaches to surface functionalization indicated good viability of the normal human dermal fibroblast and osteoblast cells and confirmed the high osteoconductive features of the biomaterial. The similarities of both types of coat-forming materials indicate an excellent potential of the silver-silica composite as a new material for the functionalization of the surface of a biomaterial and the development of a new type of functionalized implants.

scholarly journals Thermo-mechanical behavior and structure of melt blown shape-memory polyurethane nonwovens

2016 ◽  
Vol 62 ◽  
pp. 545-555 ◽  
Author(s):  
David L. Safranski ◽  
Jennifer M. Boothby ◽  
Cambre N. Kelly ◽  
Kyle Beatty ◽  
Nishant Lakhera ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Shape Memory ◽  
Shape Memory Polyurethane

Surface characteristics of chitin-based shape memory polyurethane elastomers

2009 ◽  
Vol 72 (2) ◽  
pp. 248-252 ◽  
Author(s):  
Khalid Mahmood Zia ◽  
Mohammad Zuber ◽  
Mehdi Barikani ◽  
Ijaz Ahmad Bhatti ◽  
Mohammad Bilal Khan
Keyword(s):  
Shape Memory ◽  
Surface Characteristics ◽  
Polyurethane Elastomers ◽  
Shape Memory Polyurethane

One-Pot Preparation of Electroactive Shape Memory Polyurethane/Carbon Black Blend

2021 ◽  
Author(s):  
Leyla Uranbey ◽  
Halil Ibrahim Unal ◽  
Gokce Calis ◽  
Omer Yunus Gumus ◽  
Sukran Katmer ◽  
...  
Keyword(s):  
Carbon Black ◽  
Shape Memory ◽  
One Pot ◽  
Shape Memory Polyurethane

Study on sisal-based polyurethane foam with multi-shape memory properties

2021 ◽  
Author(s):  
Lulu Pan ◽  
Jianfeng Ban ◽  
Tiwen Xu ◽  
Ruiquan Liu ◽  
Shaorong Lu
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Cross Linking ◽  
Hydroxyl Groups ◽  
Shape Memory Properties ◽  
New Type ◽  
Shape Memory Polyurethane ◽  
Chemical Cross Linking

A new type of sisal-based shape memory polyurethane foam (SMPU-PSF) was prepared by chemical cross-linking of hydroxyl groups on sisal cellulose (PSF) with polycaprolactone and MDI, which used PSF as...

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