Super-tough and thermo-healable hydrogel – promising for shape-memory absorbent fiber

2014 ◽  
Vol 2 (43) ◽  
pp. 7631-7638 ◽  
Author(s):  
Xinkun Lu ◽  
Ching Ying Chan ◽  
Ka I Lee ◽  
Pui Fai Ng ◽  
Bin Fei ◽  
...  
Keyword(s):  
Shape Memory ◽  
One Step ◽  
Step Polymerization

Super-tough and highly squeezable hydrogel by a one-step polymerization shows ultra extendability and healability and leads to a shape-memory absorbent fiber.

The electron beam freeform fabrication of NiTi shape memory alloys. Part I: Microstructure and physical–chemical behavior

2020 ◽  
pp. 146442072097505
Author(s):  
RPM Guimarães ◽  
F Pixner ◽  
G Trimmel ◽  
J Hobisch ◽  
T Rath ◽  
...  
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Freeform Fabrication ◽  
Austenitic Transformation ◽  
Columnar Grains ◽  
One Step ◽  
Niti Shape Memory Alloys

Nickel–titanium alloys are the most widely used shape memory alloys due to their outstanding shape memory effect and superelasticity. Additive manufacturing has recently emerged in the fabrication of shape memory alloy but despite substantial advances in powder-based techniques, less attention has been focused on wire-based additive manufacturing. This work reports on the preliminary results for the process-related microstructural and phase transformation changes of Ni-rich nickel–titanium alloy additively manufactured by wire-based electron beam freeform fabrication. To study the feasibility of the process, a simple 10-layer stack structure was successfully built and characterized, exhibiting columnar grains and achieving one-step reversible martensitic–austenitic transformation, thus showing the potential of this additive manufacturing technique for processing shape memory alloys.

scholarly journals Effect of Nd Addition on the Microstructure and Martensitic Transformation of Ni-Ti Shape Memory Alloys

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
M. Dovchinvanchig ◽  
C. W. Zhao ◽  
S. L. Zhao ◽  
X. K. Meng ◽  
Y. J. Jin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Earth Element ◽  
Transformation Behavior ◽  
Nd Addition ◽  
One Step ◽  
Niti Matrix ◽  
Start Temperature

The effect of rare earth element Nd addition on the microstructure and martensitic transformation behavior of Ni50Ti50−xNdx(x=0, 1, 3, 7, 20) shape memory alloy was investigated experimentally. The results showed that the microstructure of Ni-Ti-Nd ternary alloy consists of the NiNd phase and the NiTi matrix. One-step martensitic transformation was observed in all alloys. The martensitic transformation start temperatureMsincreased gradually with increasing Nd content for Ni-Ti-Nd alloys.

scholarly journals Nanocrystal, phase transformation and microstructure of Ni50Ti50 shape memory alloy

2018 ◽  
Vol 24 (02) ◽  
pp. 22-25
Author(s):  
Dovchinvanchig M ◽  
Chunwang Zhao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
One Step ◽  
Niti Matrix ◽  
Electronic Microscope

The nanocrystal, phase transformation and microstructure behavior of Ni50Ti50 shape memory alloy was investigated by scanning electronic microscope, X-ray diffraction and differential scanning calorimetry. The results showed that the microstructure of Ni-Ti binary alloy consists of the NiTi2 phase and the NiTi matrix phase. One-step phase transformation was observed alloy.

Dopamine-Triggered One-Step Polymerization and Codeposition of Acrylate Monomers for Functional Coatings

2017 ◽  
Vol 9 (39) ◽  
pp. 34356-34366 ◽  
Author(s):  
Chao Zhang ◽  
Meng-Qi Ma ◽  
Ting-Ting Chen ◽  
He Zhang ◽  
Deng-Feng Hu ◽  
...  
Keyword(s):  
Functional Coatings ◽  
One Step ◽  
Acrylate Monomers ◽  
Step Polymerization

Transformation Behavior and Shape Memory Characteristics of Ti-45Ni-5Cu(at%) Alloy Ribbons Fabricated by Melt Spinning

2004 ◽  
Vol 449-452 ◽  
pp. 1093-1096 ◽  
Author(s):  
Tae Hyun Nam ◽  
Jae Hwa Lee ◽  
Tae Yeon Kim ◽  
Yeon Wook Kim
Keyword(s):  
Shape Memory ◽  
Melt Spinning ◽  
Constant Load ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
X Ray ◽  
Density Of Dislocations ◽  
Large Lattice ◽  
One Step ◽  
Memory Characteristics

Transformation behaviors and shape memory characteristics of Ti-45Ni-5Cu alloy ribbons fabricated by melt spinning were investigated by means of optical microscopy, differential scanning calorimetries(DSC), X-ray diffraction and thermal cycling tests under constant load. They depended largely on temperatures of liquid metal. The B2-B19-B19’ two-step transformation occurred in the ribbons fabricated with the liquid whose temperature was higher than 1723 K, while the B2-B19’ one-step transformation occurred in the ribbons with the liquid at 1673 K. The stabilization of the B19 martensite in Ti-45Ni-5Cu alloy ribbons was ascribed to the high density of dislocations which made strong resistance to large lattice deformation associated with a formation of the B19’ martensite.

Investigation on microstructure and martensitic transformation of neodymium-added NiTi shape memory alloys

2016 ◽  
Vol 30 (28) ◽  
pp. 1650286
Author(s):  
Dovchinvanchig Maashaa ◽  
Ulzii-Orshikh Dorj ◽  
Malrey Lee ◽  
Min Hi Lee ◽  
Chunwang Zhao ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
X Ray Diffraction ◽  
Martensitic Transformation Temperature ◽  
Scanning Calorimetry ◽  
Nd Addition ◽  
One Step ◽  
Niti Shape Memory Alloys ◽  
Niti Matrix ◽  
Electronic Microscope

The effect of rare earth element neodymium (Nd) addition on the microstructure and martensitic transformation behavior of Ni[Formula: see text]Ti[Formula: see text]Nd[Formula: see text] ([Formula: see text] = 0, 0.1, 0.3, 0.5 and 0.7 at.%) shape memory alloy was investigated by scanning electronic microscope, X-ray diffraction and differential scanning calorimetry. The results show that the microstructure of Ni–Ti–Nd ternary alloy consists of NiNd phase, NiTi2 and the NiTi matrix. A one-step martensitic transformation is observed in the alloys. The martensitic transformation temperature Ms increases sharply increasing 0.1–0.7 at.% Nd content is added.

Electrical Conductivity of BioBased Shape Memory Polyurethane Filled with CNT

2016 ◽  
Vol 880 ◽  
pp. 69-72
Author(s):  
Ernie Suzana Ali ◽  
Azwani Sofia Ahmad Khiar ◽  
Syazana Ahmad Zubir ◽  
Zul Afiq Zaim Zulkeple
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Shape Memory ◽  
Palm Oil ◽  
Polymerization Process ◽  
Diphenylmethane Diisocyanate ◽  
Shape Memory Polyurethane ◽  
Step Polymerization

Biobased shape memory polyurethane filled with carbon nanotubes (CNT) were prepared using two step polymerization process. The bio based shape memory polyurethane (SMPU) were composed of polycaprolactonediol, polyol based on palm oil, 4, 4’-diphenylmethane diisocyanate and 1, 4-butanediol. In this paper, CNTs has been used as fillers to introduce the electrical conductivity in the SMPU. The bio-based shape memory polyurethane shows electrical conductivity with addition of 7 wt% CNT.

Improving the photocatalytic activity of polyaniline and a porphyrin via oxidation to obtain a salt and a charge-transfer complex

2017 ◽  
Vol 41 (23) ◽  
pp. 14595-14601 ◽  
Author(s):  
Ramesh Gottam ◽  
Palaniappan Srinivasan ◽  
Duong Duc La ◽  
Sheshanath V. Bhosale
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
One Step ◽  
A Charge ◽  
Step Polymerization

Simple, efficient, and one-step polymerization of aniline to a novel polyaniline salt consisting of sulfate and porphyrin dopants as an efficient photocatalyst for dyes.

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