scholarly journals Editing the Shape Morphing of Monocomponent Natural Polysaccharide Hydrogel Films

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hao Hu ◽  
Chao Huang ◽  
Massimiliano Galluzzi ◽  
Qiang Ye ◽  
Rui Xiao ◽  
...  
Keyword(s):  
Soft Robotics ◽  
Cross Linking ◽  
Short Side ◽  
Practical Applications ◽  
Shape Morphing ◽  
Simple Strategy ◽  
Natural Polysaccharide ◽  
Manufacturing Techniques ◽  
Polysaccharide Hydrogel ◽  
Hydrogel Films

Shape-morphing hydrogels can be widely used to develop artificial muscles, reconfigurable biodevices, and soft robotics. However, conventional approaches for developing shape-morphing hydrogels highly rely on composite materials or complex manufacturing techniques, which limit their practical applications. Herein, we develop an unprecedented strategy to edit the shape morphing of monocomponent natural polysaccharide hydrogel films via integrating gradient cross-linking density and geometry effect. Owing to the synergistic effect, the shape morphing of chitosan (CS) hydrogel films with gradient cross-linking density can be facilely edited by changing their geometries (length-to-width ratios or thicknesses). Therefore, helix, short-side rolling, and long-side rolling can be easily customized. Furthermore, various complex artificial 3D deformations such as artificial claw, horn, and flower can also be obtained by combining various flat CS hydrogel films with different geometries into one system, which can further demonstrate various shape transformations as triggered by pH. This work offers a simple strategy to construct a monocomponent hydrogel with geometry-directing programmable deformations, which provides universal insights into the design of shape-morphing polymers and will promote their applications in biodevices and soft robotics.

BSA as additive: A simple strategy for practical applications of PNA in bioanalysis

2015 ◽  
Vol 69 ◽  
pp. 167-173 ◽  
Author(s):  
Jieon Lee ◽  
Il-Soo Park ◽  
Henna Kim ◽  
Jae-Sung Woo ◽  
Byong-Seok Choi ◽  
...  
Keyword(s):  
Practical Applications ◽  
Simple Strategy

scholarly journals Enhanced Stretchable and Sensitive Strain Sensor via Controlled Strain Distribution

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 218 ◽  
Author(s):  
Huamin Chen ◽  
Longfeng Lv ◽  
Jiushuang Zhang ◽  
Shaochun Zhang ◽  
Pengjun Xu ◽  
...  
Keyword(s):  
Strain Distribution ◽  
Tensile Strain ◽  
Strain Sensor ◽  
Gauge Factor ◽  
Simple Method ◽  
Practical Applications ◽  
Simple Strategy ◽  
Highly Sensitive ◽  
Highly Stretchable ◽  
Maximum Tensile Strain

Stretchable and wearable opto-electronics have attracted worldwide attention due to their broad prospects in health monitoring and epidermal applications. Resistive strain sensors, as one of the most typical and important device, have been the subject of great improvements in sensitivity and stretchability. Nevertheless, it is hard to take both sensitivity and stretchability into consideration for practical applications. Herein, we demonstrated a simple strategy to construct a highly sensitive and stretchable graphene-based strain sensor. According to the strain distribution in the simulation result, highly sensitive planar graphene and highly stretchable crumpled graphene (CG) were rationally connected to effectively modulate the sensitivity and stretchability of the device. For the stretching mode, the device showed a gauge factor (GF) of 20.1 with 105% tensile strain. The sensitivity of the device was relatively high in this large working range, and the device could endure a maximum tensile strain of 135% with a GF of 337.8. In addition, in the bending mode, the device could work in outward and inward modes. This work introduced a novel and simple method with which to effectively monitor sensitivity and stretchability at the same time. More importantly, the method could be applied to other material categories to further improve the performance.

Formulation and Evaluation of Oral Natural Polysaccharide Hydrogel Microbeads of Irbesartan

2016 ◽  
Vol 6 (4) ◽  
pp. 334-344 ◽  
Author(s):  
Devi Lalitha Gatiganti ◽  
Madhavi Harika Srimathkandala ◽  
Madhu Babu Ananthula ◽  
Vasudha Bakshi
Keyword(s):  
Natural Polysaccharide ◽  
Polysaccharide Hydrogel

Cross-linked antifouling polysaccharide hydrogel coating as extracellular matrix mimics for wound healing

2017 ◽  
Vol 5 (16) ◽  
pp. 2989-2999 ◽  
Author(s):  
Yuqin Tang ◽  
Xueqin Cai ◽  
Yingying Xiang ◽  
Yu Zhao ◽  
Xinge Zhang ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Wound Healing ◽  
Diabetic Wound ◽  
Natural Polysaccharide ◽  
Diabetic Wound Healing ◽  
Polysaccharide Hydrogel ◽  
Hydrogel Coating

Antifouling hydrogel coating based on natural polysaccharide could effectively promote diabetic wound healing.

scholarly journals Preparation of Cross-linked Chitosan Quaternary Ammonium Salt Hydrogel Films Loading Drug of Gentamicin Sulfate for Antibacterial Wound Dressing

Marine Drugs ◽  
2021 ◽  
Vol 19 (9) ◽  
pp. 479
Author(s):  
Jingjing Zhang ◽  
Wenqiang Tan ◽  
Qing Li ◽  
Xiaorui Liu ◽  
Zhanyong Guo
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Wound Dressing ◽  
Cross Linking ◽  
And Staphylococcus Aureus ◽  
Hydrogel Films

Hydrogels, possessing high biocompatibility and adaptability to biological tissue, show great usability in medical applications. In this research, a series of novel cross-linked chitosan quaternary ammonium salt loading with gentamicin sulfate (CTMCSG) hydrogel films with different cross-linking degrees were successfully obtained by the reaction of chitosan quaternary ammonium salt (TMCS) and epichlorohydrin. Fourier transform infrared spectroscopy (FTIR), thermal analysis, and scanning electron microscope (SEM) were used to characterize the chemical structure and surface morphology of CTMCSG hydrogel films. The physicochemical property, gentamicin sulphate release behavior, cytotoxicity, and antibacterial activity of the CTMCSG against Escherichia coli and Staphylococcus aureus were determined. Experimental results demonstrated that CTMCSG hydrogel films exhibited good water stability, thermal stability, drug release capacity, as well as antibacterial property. The inhibition zone of CTMCSG hydrogel films against Escherichia coli and Staphylococcus aureus could be up to about 30 mm. Specifically, the increases in maximum decomposition temperature, mechanical property, water content, swelling degree, and a reduction in water vapor permeability of the hydrogel films were observed as the amount of the cross-linking agent increased. The results indicated that the CTMCSG-4 hydrogel film with an interesting physicochemical property, admirable antibacterial activity, and slight cytotoxicity showed the potential value as excellent antibacterial wound dressing.

scholarly journals Agile reversible shape-morphing of particle rafts

Soft Matter ◽  
2021 ◽  
Author(s):  
Kyungmin Son ◽  
Jeong-Yun Sun ◽  
Ho-Young Kim
Keyword(s):  
Soft Matter ◽  
Soft Robotics ◽  
Wearable Electronics ◽  
Shape Morphing ◽  
Soft Matter Physics ◽  
External Stimuli

Materials that transform shapes responding to external stimuli can bring unprecedented innovations to soft matter physics, soft robotics, wearable electronics, and architecture. As most conventional soft actuation technologies induce large...

Stability of Radiation Grafted Membranes in Electro-Electrodialysis of HIX Solution

2010 ◽  
Author(s):  
Nobuyuki Tanaka ◽  
Tetsuya Yamaki ◽  
Masaharu Asano ◽  
Yasunari Maekawas ◽  
Kaoru Onuki ◽  
...  
Keyword(s):  
High Temperature ◽  
Cell Voltage ◽  
Exchange Capacity ◽  
Cross Linking ◽  
Energy Agency ◽  
Practical Applications ◽  
Electrolyte Membranes ◽  
A Cell ◽  
Radiation Induced ◽  
Conducting Research

Japan Atomic Energy Agency has been conducting research and development on a thermochemical water-splitting cycle featuring iodine- and sulfur-compounds (called an IS process) as one of promising heat utilization systems of High Temperature Gas-Cooled Reactors. We have prepared polymer electrolyte membranes by the radiation-induced graft polymerization and cross-linking methods and then have investigated their applicability to electro-electrodialysis (EED) for concentrating HI in an HI-I2-H2O mixture. For practical applications, EED membranes are required to be stable in the severe environment of high-temperature strongly acidic solutions. We thus examined thermal, chemical and electrochemical stabilities of the radiation-grafted membranes under the conditions of the actual EED operation over 100 hours, while measuring the time evolution of a cell voltage and a change in the ion exchange capacity between the EED experiment. The results showed that chemical cross-linking in the graft chains could largely improve the membrane stability.

Structure–properties relationship of the polyurethanes that contain Schiff base in the main chain

2020 ◽  
Vol 32 (7) ◽  
pp. 784-792
Author(s):  
Stefan Oprea ◽  
Violeta Otilia Potolinca ◽  
Veronica Oprea ◽  
Livia Ingrid Diaconu
Keyword(s):  
Schiff Base ◽  
Main Chain ◽  
Raw Materials ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Chain Extender ◽  
Cross Linking ◽  
Practical Applications ◽  
Molar Ratios ◽  
A Chain

This article studies the diversification of useful properties of polyurethane (PU) structures by the inclusion of new components. PUs containing a Schiff base in the main chain were synthesized by using N, N′-bis(salicylidene)-1,3-propanediamine as a chain extender. Novel Schiff base PUs were synthesized via a two-step polymerization starting from a Schiff base derivative diol chain extender with different molar ratios or by cross-linking with various natural raw materials. The sought after structures was confirmed by Fourier transform infrared spectra that showed the disappearance of the signals of both the hydroxyl and isocyanate groups. The thermal properties of these PUs were investigated by thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The initial degradation temperatures of the obtained PUs were found to be in the range of 300–350°C. Based on the results from DMA, the rigid structure of the Schiff base from the backbone of the PUs presented a higher storage modulus, results which may be connected to the physical cross-linking process of the macromolecules. Their optical properties were determined by fluorescence spectroscopy. The incorporation of Schiff base structures into the main PU chain generates new PU structures with improved thermomechanical properties, which includes possible bioactive Schiff base moieties, widening the range of practical applications for such polymers.

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