Shape memory alloy activated high-pressure optical cell for biophysical studies

2000 ◽  
Vol 71 (11) ◽  
pp. 4249 ◽  
Author(s):  
Jack G. Zhou ◽  
Spiros Koulas ◽  
Parkson Lee-Gau Chong
Keyword(s):  
High Pressure ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Optical Cell ◽  
Biophysical Studies

Design, Simulation and Testing of Shape Memory Alloy Actuator for Mixing Two Solutions in High-Pressure Optical Cell for Biophysical Studies

2006 ◽  
Author(s):  
Hongchun Xie ◽  
Jack Zhou ◽  
Parkson Chong
Keyword(s):  
High Pressure ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Intensity Change ◽  
Optical Cell ◽  
Pull Out ◽  
Spring Force ◽  
Heat Response ◽  
Sma Spring

Window-type high-pressure optical cells (HPOC) such as the one designed by Paladini and Weber [Rev. Sci. Instrum. 52, (1981) p. 419] have provided biophysicists a powerful tool to understand the structure-function relationships of biological molecules. However, the conventional HPOC is only good for single solution testing and does not allow for quick mixing and stirring of additional components while the sample is under pressure. To mix two solutions under pressure, Zhou et al [Rev. Sci. Instrum. 69, (1998) p. 3958] developed a laser activated dual chamber HPOC. However, the expensive laser device and its unavailability in most laboratories make the application difficult. In a later study, Zhou et al. [Rev. Sci. Instrum. 71, (2000) p. 4249] introduced shape memory alloy (SMA) as an actuator to unplug a urethane stopper with a biasing spring for agitation. The drawback is that the biasing spring blocks the observing light beam and creates unwanted reflections. This research is to construct an actuator with concentric SMA spring and compressive biasing spring: an SMA helical tensile spring to pull out the stopper to let two solutions mix; and a helical compressive spring to bias and to agitate solutions, and to leave the lower half cuvette clear for optical observation. Due to the limited space in the cuvette, the alignment of two springs is critical for both motion and heat response to activate each spring separately. This paper discusses the design of SMA actuator, SMA spring testing and mixing testing by the SMA spring actuator. Since SMA (nickel-titanium) spring is not solderable and crimping method is limited due to the space, a conductive adhesive is used not only to fix the alignment between springs and cap, but also to conduct electric current. Spring force testing was done by INSTRON. Mixing testing used flourescein intensity change to trace the mixing process. The bio-compatibility of the nickel-titanium SMA with proteins and phospholipids has also been tested.

Design of a New High Pressure Apparatus Using Shape Memory Alloy

2000 ◽  
Vol 327-328 ◽  
pp. 39-42
Author(s):  
G. Oomi ◽  
S. Aduma ◽  
I. Kosaka ◽  
T. Kagayama ◽  
Minoru Nishida
Keyword(s):  
High Pressure ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Pressure Apparatus

scholarly journals Hardness-gradient reversion in FeMnSiCr shape memory alloy modules produced by high-speed high pressure torsion

2015 ◽  
Vol 33 ◽  
pp. 04001 ◽  
Author(s):  
Leandru-Gheorghe Bujoreanu ◽  
Viorel Goanță ◽  
Nicanor Cimpoeșu ◽  
Carmela Gurău ◽  
Marius-Gabriel Suru ◽  
...  
Keyword(s):  
High Pressure ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Speed ◽  
High Pressure Torsion ◽  
Hardness Gradient

scholarly journals The effect of high-pressure torsion on the microstructure and outstanding pseudoelasticity of a ternary Fe–Ni–Mn shape memory alloy

2021 ◽  
Vol 802 ◽  
pp. 140647
Author(s):  
Hamidreza Koohdar ◽  
Mahmoud Nili-Ahmadabadi ◽  
Faezeh Javadzadeh Kalahroudi ◽  
Hamid Reza Jafarian ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Pressure Torsion

Novel High-Speed High Pressure Torsion Technology for Obtaining Fe-Mn-Si-Cr Shape Memory Alloy Active Elements

2014 ◽  
Vol 23 (7) ◽  
pp. 2396-2402 ◽  
Author(s):  
Gheorghe Gurău ◽  
Carmela Gurău ◽  
Octavian Potecaşu ◽  
Petrică Alexandru ◽  
Leandru-Gheorghe Bujoreanu
Keyword(s):  
High Pressure ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Speed ◽  
High Pressure Torsion ◽  
Active Elements
Sign in / Sign up

Export Citation Format

Share Document