A pH controlled temperature response reprogramming hydrogel for monitoring human electrophysiological signals

2021 ◽  
Author(s):  
Zihang Shen ◽  
Kaiyue Liu ◽  
Zheng Zhou ◽  
Qifang Li
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Hydrophobic Interaction ◽  
Temperature Response ◽  
Ph Responsive ◽  
Simple Method ◽  
Electrophysiological Signals ◽  
Ph Controlled

This study proposes a simple method to prepare a pH-responsive and shape memory hydrogel based on cooperative hydrophobic interaction and hydrogen bonding.

Selective Hydrogen Bonding Controls Temperature Response of Layer-by-Layer Upper Critical Solution Temperature Micellar Assemblies

Soft Matter ◽  
2021 ◽  
Author(s):  
Aliaksei Aliakseyeu ◽  
Victoria Albright ◽  
Danielle Yarbrough ◽  
Samantha Hernandez ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Methacrylic Acid ◽  
Temperature Response ◽  
Solution Temperature ◽  
Layer By Layer ◽  
Critical Solution Temperature ◽  
Hydrogen Bonding Interactions ◽  
Upper Critical Solution Temperature ◽  
Lbl Films

This work establishes a correlation between the selectivity of hydrogen-bonding interactions and the functionality of micelle-containing layer-by-layer (LbL) assemblies. Specifically, we explore LbL films formed by assembly of poly(methacrylic acid)...

scholarly journals Scalable Output Linear Actuators, a Novel Design Concept Using Shape Memory Alloy Wires Driven by Fluid Temperature

Machines ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
Andres Osorio Salazar ◽  
Yusuke Sugahara ◽  
Daisuke Matsuura ◽  
Yukio Takeda
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Angular Position ◽  
Scale Factor ◽  
Design Concept ◽  
Fluid Temperature ◽  
Step Size ◽  
Simple Method ◽  
Output Characteristics ◽  
Novel Design

In this paper, the concept of scalability for actuators is introduced and explored, which is the capability to freely change the output characteristics on demand: displacement and force for a linear actuator, angular position and torque for a rotational actuator. This change can either be used to obtain power improvement (with a constant scale factor), or to improve the usability of a robotic system according to variable conditions (with a variable scale factor). Some advantages of a scalable design include the ability to adapt to changing environments, variable resolution of step size, ability to produce designs that are adequate for restricted spaces or that require strict energy efficiency, and intrinsically safe systems. Current approaches for scalability in actuators have shortcomings: the method to achieve scalability is complex, so obtaining a variable scaling factor is challenging, or they cannot scale both output characteristics simultaneously. Shape Memory Alloy (SMA) wire-based actuators can overcome these limitations, because its two output characteristics, displacement and force, are physically independent from each other. In this paper we present a novel design concept for linear scalable actuators that overcome SMA design and scalability limitations by using a variable number of SMA wires mechanically in parallel, immersed in a liquid that transmits heat from a separate heat source (wet activation). In this concept, more wires increase the maximum attainable force, and longer wires increase the maximum displacement. Prototypes with different number of SMA wires were constructed and tested in isometric experiments to determine force vs. temperature behavior and time response. The heat-transmitting liquid was either static or flowing using pumps. Scalability was achieved with a simple method in all tested prototypes with a linear correlation of maximum force to number of SMA wires. Flowing heat transmission achieved higher actuation bandwidth.

Use of Quadruple Hydrogen Bonding as the Switching Phase in Thermo- and Light-Responsive Shape Memory Hydrogel

2021 ◽  
Author(s):  
Yufang Song ◽  
Yiming Chen ◽  
Ran Chen ◽  
Hongji Zhang ◽  
Dongjian Shi ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Quadruple Hydrogen Bonding

Hydrophobic interaction and hydrogen bonding driving the self-assembling of quinoa protein and flavonoids

2021 ◽  
pp. 106807
Author(s):  
Kang Liu ◽  
Xue-Qiang Zha ◽  
Qiang-Ming Li ◽  
Li-Hua Pan ◽  
Jian-Ping Luo
Keyword(s):  
Hydrogen Bonding ◽  
Hydrophobic Interaction ◽  
The Self ◽  
Self Assembling

Engineering bio-inspired peptide–polyurea hybrids with thermo-responsive shape memory behaviour

2021 ◽  
Author(s):  
Daseul Jang ◽  
Chase B. Thompson ◽  
Sourav Chatterjee ◽  
LaShanda T. J. Korley
Keyword(s):  
Hydrogen Bonding ◽  
Secondary Structure ◽  
Shape Memory ◽  
Shape Memory Behaviour ◽  
Peptide Secondary Structure

This paper highlights the influence of peptide secondary structure on the shape memory behaviour of peptidic polyureas, driven by hydrogen bonding arrangement and microphase-separated morphology.

Novel Shape-Memory Polymer Based on Hydrogen Bonding

2006 ◽  
Vol 27 (14) ◽  
pp. 1100-1104 ◽  
Author(s):  
Guoqin Liu ◽  
Chunlong Guan ◽  
Hesheng Xia ◽  
Fuquan Guo ◽  
Xiaobin Ding ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Shape Memory Polymer

Intermolecular hydrogen bonding in developing nanostructured epoxy shape memory thermosets: Effects on morphology, thermo-mechanical properties and surface wetting

2020 ◽  
Vol 81 ◽  
pp. 106279 ◽  
Author(s):  
Jyotishkumar Parameswaranpillai ◽  
M.R. Sanjay ◽  
Suchart Siengchin ◽  
Sisanth Krishnan Sidhardhan ◽  
Seno Jose ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Bonding ◽  
Shape Memory ◽  
Intermolecular Hydrogen Bonding ◽  
Surface Wetting

scholarly journals Shape memory compression anastomosis clips in gastrointestinal surgery in dogs

2016 ◽  
Vol 61 (No. 9) ◽  
pp. 524-527
Author(s):  
P. Holak ◽  
Z. Lekston
Keyword(s):  
Shape Memory ◽  
Surgical Procedures ◽  
Bowel Resection ◽  
Gastrointestinal Surgery ◽  
Nickel Titanium ◽  
Clinical Experiences ◽  
Bowel Anastomosis ◽  
Simple Method ◽  
Compression Anastomosis ◽  
Intestinal Continuity

This paper describes clinical experiences with the use of shape memory nickel-titanium (NiTi) clips in gastrointestinal surgery in dogs. Side-to-side small bowel anastomosis was performed in eight dogs where intestinal continuity had to be restored after bowel resection. Billroth’s operation I was performed in one case. Compression anastomosis clips with two-way shape memory were used in all surgical procedures. Intestinal and gastrointestinal anastomoses involving shape memory clips were effective in all patients. Anastomotic leaks were not observed, and all clips were expelled 5–7 days after surgery. The outcomes of surgical procedures performed on canine patients with the use of shape memory NiTi clips indicate that sutureless compression anastomosis is a safe, effective and simple method of restoring gastrointestinal continuity, which can be widely applied in veterinary practice.

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