Multilayer tubes that constrict, dilate, and curl in response to stimuli

Soft Matter ◽  
2021 ◽  
Vol 17 (15) ◽  
pp. 4180-4190
Author(s):  
Brady C. Zarket ◽  
Hanchu Wang ◽  
Sai N. Subraveti ◽  
Srinivasa R. Raghavan
Keyword(s):  
Polymer Gel

Tubes with multiple concentric layers are synthesized, with each layer being a distinct polymer–gel. The tubes are able to constrict, dilate, and curl in response to the properties of the fluid flowing through them.

Freeze-etch TEM of aqueous polymer gel network morphology

1986 ◽  
Vol 44 ◽  
pp. 796-797
Author(s):  
J. A. N. Zasadzinski ◽  
R. K. Prud'homme
Keyword(s):  
Metal Ion ◽  
Polymer Network ◽  
Polymer Gels ◽  
Polymer Gel ◽  
Deformation History ◽  
Crosslinked Polymer ◽  
Aqueous Polymer ◽  
History Of ◽  
Gel Network ◽  
Network Morphology

The rheological and mechanical properties of crosslinked polymer gels arise from the structure of the gel network. In turn, the structure of the gel network results from: thermodynamically determined interactions between the polymer chain segments, the interactions of the crosslinking metal ion with the polymer, and the deformation history of the network. Interpretations of mechanical and rheological measurements on polymer gels invariably begin with a conceptual model of,the microstructure of the gel network derived from polymer kinetic theory. In the present work, we use freeze-etch replication TEM to image the polymer network morphology of titanium crosslinked hydroxypropyl guars in an attempt to directly relate macroscopic phenomena with network structure.

Role of Polymer in Enhancement of Conductivity of Proton and Lithium Conducting Polymer Gel Electrolytes

2016 ◽  
Vol 4 (2) ◽  
pp. 1
Author(s):  
KUMAR RAJIV ◽  
SHARMA SHUCHI ◽  
DHIMAN NARESH ◽  
PATHAK DINESH ◽  
◽  
...  
Keyword(s):  
Conducting Polymer ◽  
Polymer Gel ◽  
Gel Electrolytes ◽  
Polymer Gel Electrolytes

Dosimetry and Radioenhancement Comparison of Gold Nanoparticles in Kilovoltage and Megavoltage Radiotherapy using MAGAT Polymer Gel Dosimeter

2019 ◽  
Vol 9 (2Apr) ◽  
Author(s):  
S Farahani ◽  
N Riyahi Alam ◽  
S Haghgoo ◽  
M Khoobi ◽  
Gh Geraily ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
3D Visualization ◽  
Energy Levels ◽  
Polymer Gel ◽  
External Radiotherapy ◽  
Dose Enhancement ◽  
Internal Radiotherapy ◽  
Boost Radiotherapy

Background: Numerous unique characteristics of the nanosized gold, including high atomic number, low toxicity, and high biocompatibility make it one of the most appropriate nanostructures to boost radiotherapy efficacy. Many in-vivo and in-vitro investigations have indicated that gold nanoparticles (AuNPs) can significantly increase tumor injuries in low kilovoltage radiotherapy. While deep-lying tumors require much higher energy levels with greater penetration power, and investigations carried out in megavoltage energy range show contradictory results.Objective: In this study, we quantitatively assess and compare dose enhancement factors (DEFs) obtained through AuNPs under radiation of Cobalt-60 source (1.25MeV) versus Iridium-192 source (0.380 KeV) using MAGAT gel dosimeter.Material and Methods: MAGAT polymer gel in both pure and combined with 0.2 mM AuNPs was synthesized. In order to quantify the effect of energy on DEF, irradiation was carried out by Co-60 external radiotherapy and Ir-192 internal radiotherapy. Finally, readings of irradiated and non-irradiated gels were performed by MR imaging.Result: The radiation-induced R2 (1/T2) changes of the gel tubes doped with AuNPs compared to control samples, upon irradiation of beams released by Ir-192 source showed a significant dose enhancement (15.31% ±0.30) relative to the Co-60 external radiotherapy (5.85% ±0.14).Conclusion: This preliminary study suggests the feasibility of using AuNPs in radiation therapy (RT), especially in low-energy sources of brachytherapy. In addition, MAGAT polymer gel, as a powerful dosimeter, could be used for 3D visualization of radiation dose distribution of AuNPs in radiotherapy.

MR Imaged Polymer Gel Radiation Dosimetry: Disclosed Yet Unpatented

2008 ◽  
Vol 1 (3) ◽  
pp. 203-212 ◽  
Author(s):  
Panagiotis Antoniou ◽  
Eleni Kaldoudi
Keyword(s):  
Radiation Dosimetry ◽  
Polymer Gel

Development of a Polymer Gel System for Improved Sweep Efficiency and Injection Profile Modification of IOR/EOR Treatments

2014 ◽  
Author(s):  
Freddy Crespo ◽  
B. R. Reddy ◽  
Larry Eoff ◽  
Christopher Lewis ◽  
Natalie Pascarella
Keyword(s):  
Polymer Gel ◽  
Sweep Efficiency ◽  
Profile Modification ◽  
Gel System

In Situ Curing Technology for Dual Ceramic Composed by Organic–Inorganic Functional Polymer Gel Electrolyte for Dendritic‐Free and Robust Lithium–Metal Batteries

2020 ◽  
Vol 7 (20) ◽  
pp. 2000830
Author(s):  
Sajid Hussain Siyal ◽  
Muhammad Sufyan Javed ◽  
Ashique Hussain Jatoi ◽  
Jin‐Le Lan ◽  
Yunhua Yu ◽  
...  
Keyword(s):  
Gel Electrolyte ◽  
Polymer Gel ◽  
Lithium Metal ◽  
Polymer Gel Electrolyte ◽  
Functional Polymer ◽  
Lithium Metal Batteries

Application of Ionic Liquid-polymer Gel Membrane in Toluene/n-Heptane Separation

2021 ◽  
pp. 118596
Author(s):  
Yuming Tu ◽  
Hui Yu ◽  
Wei He ◽  
Zhiyong Zhou ◽  
Wei Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Polymer Gel ◽  
Liquid Polymer ◽  
Ionic Liquid Polymer
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