Preparation of PVA hydrogel with high-transparence and investigations of its transparent mechanism

Hou, Yi; Chen, Chen; Liu, Kemin; Tu, Ying; Zhang, Li; Li, Yubao

doi:10.1039/c5ra01280e

Cited by 97 publications

(70 citation statements)

References 39 publications

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“…As seen in Figure a, we obtained a clear and viscous liquid with PVA upon processing with LiClO 4 salt and dimethyl sulfoxide (DMSO). We did not observe any significant physical cross‐linking of PVA dissolved in pure DMSO that is reported to be mechanically weak even after freezing–thawing cycles . To improve toughness and mechanical stability, we adopted a thermally induced chemical cross‐linking technique using GA .…”

Section: Resultsmentioning

confidence: 98%

“…The SPE films have good structural integrity and could be easily applicable to the uneven or curved surfaces, although they do not offer full flexibility and sufficient impact resistance (Figure c). The probable reason could be the spatial distribution of numerous tiny crystalline regions in the scaffold that did not hinder the light transmittance but affected the elasticity of the solid film. A typical wide angle X‐ray diffraction (WAXD) spectrum obtained from these SPEs is shown in Figure S1 (black line, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

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Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ganesh

Deb

2017

Adv Materials Inter

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challenging mainly because of their lower ionic conductivity and high relaxation period. In mono-electrochrome (i.e., with a single active EC layer) ECD configurations, an ion-conducting SPE is sandwiched between two transparent conducting oxide coated glass, one of which is laminated with the functional coating. The working mechanism of the ECDs resembles a thin film electrochemical cell, prompting contemporary EC researchers to explore the possibility of integrating ECDs with other electrochemical energy storage devices such as batteries, [2,3] supercapacitors, [4][5][6] and pseudocapacitors. [7,8] Yang et al. [9] published an excellent review that outlines potential impact areas of these efforts. Tian et al. [10] reported the manufacturing of a W 18 O 49 /polyaniline (PANI) based energy level indicating smart supercapacitor electrode that displayed continuous color variations as a response to changing levels of stored energy. Very recently, an ultrafast-charging, high-capacity Al-tungsten oxide based electrochromic battery has been demonstrated by Zhao et al. [11] that showed a sevenfold enhancement in the discharge capacity compared to the other reported works.One substantial challenge in integrating these technologies resides in their mismatched operational requirements. Abruña et al. [12] critically described these differences by noting that the electrolytes are typically the weak-links as many electrochemical systems often push the thermodynamic stability limit for the electrolytes. Additionally, while the ECDs and batteries are designed specifically for a longer storage life, the capacitive charge storage devices require very high cycling efficiency. In a review article, Yang et al. [9] described the challenges in fabricating electrochromic energy system for simultaneous realization of electrochromism and energy storage. They pointed out that high quality ECDs are required to produce a faster and higher response in the optical density against a low charge density. However, batteries or supercapacitors must show a high charge density that significantly compromises the performance of an integrated device. In one section of their review article, Varzi et al. [13] highlighted the challenges associated with charge and mass transport in the Li + containing solid polymer electrolytes for batteries. The discussion is relevant for constructing ECDs as well for Li + ion based systems that offer more stability than an acidic system. A comprehensive list of dissimilarities in operational requirements between the ECD There are ongoing efforts to integrate electrochromic device (ECD) technology with other electrochemical systems. ECDs made with safer "solid" polymer electrolytes (SPEs) are prone to performance degradations due to their high relaxation period that is detrimental to highly dynamic switching operations. Here, the fabrication of partially crystalline WO 3 based all-solid-state mono-electrochrome switches is reported that shows outstanding optical and electrical stability under prolonged charge-discharge cy...

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Ganesh

Deb

2017

Adv Materials Inter

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“…We can also see the same results visually from optical photographs. Overall, CPM‐0.5%, CPM‐1% and CPM‐3% composite hydrogel films have enough optical properties . In addition, Figure B shows the optical images of the CH/PVP/MCM‐41 composite hydrogel films.…”

Section: Resultsmentioning

confidence: 95%

Chitosan/Polyvinylpyrrolidone/MCM‐41 Composite Hydrogel Films: Structural, Thermal, Surface, and Antibacterial Properties

et al. 2018

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The aim of this study is to characterize and investigate the effects of the Mobil Composition of Matter No. 41 (MCM-41) concentrations (0.5, 1, 3, 5, and 10 wt%) on structural, thermal, wettability, water content, oxygen (O 2 ) permeability, and swelling properties as well as morphological characteristics of chitosan/polyvinylpyrrolidone/MCM-41 (CH/PVP/MCM-41) composite hydrogel films. In addition, hydrolytic degradability, optic transmittance, and antibacterial properties of composite hydrogels films are determined as in vitro. With increasing of MCM-41 content, the composite hydrogels showed higher thermal stability, as expected. The morphologic properties of the composite hydrogel films are studied using scanning electron microscope (SEM) technique that provide evidence for good miscibility of CH, PVP, and MCM-41. The swelling and water-absorbing properties of the composite hydrogel films are significantly improved because of enhanced hydrophilic profile. Furthermore, the antimicrobial properties of the prepared composite hydrogel films are studied against Bacillus subtilis, Escherichia coli, and Candida albicans yeast. The results showed excellent antibacterial behavior of the composite hydrogel films. The study clearly demonstrates that the prepared CH/PVP/MCM-41 composite hydrogel films may be used as a promising candidate material in various fields such as drug delivery, wound healing material, and adsorbent materials.

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“…The hydrogels were cut to dumbbell-shaped samples (75 mm × 4 mm × 1.8 mm), and tested using a universal testing machine (AGIC 50KN, Shimadzu, Japan) following previously established protocols. 43 The samples were stretched at a speed of 50 mm/min under a tensile load of 10 N under ambient condition. The tensile strength and elongation of hydrogels at rupture were investigated.…”

Section: Mechanical Testingmentioning

confidence: 99%

Dual Physically Cross-Linked κ-Carrageenan-Based Double Network Hydrogels with Superior Self-Healing Performance for Biomedical Application

Deng¹,

Huang²,

Sun

et al. 2018

ACS Appl. Mater. Interfaces

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151

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Chemically linked Double network (DN) hydrogels display extraordinary mechanical attributes but mostly suffer from poor self-healing property and unsatisfactory biocompatibility due to the irreversible breaks in their chemical-linked networks and the use of toxic chemical crosslinking agents. To address these limitations, we developed a novel κcarrageenan/polyacrylamide (KC/PAM) DN hydrogel through a dual physical-crosslinking strategy, with the ductile, hydrophobically associated PAM being the first network, and the rigid potassium ion (K +) cross-linked KC being the second network. The dual physically cross-linked DN (DPC-DN) hydrogels with optimized KC concentration exhibit excellent fracture tensile stress (1320 ± 46 kPa) and toughness (fracture energy: 6900 ± 280 kJ/m 3), comparable to those fully chemically linked DN hydrogels and physically-chemically cross-linked hybrid DN hydrogels. Moreover, owing to their unique dual physical-crosslinking structures, the KC/PAM hydrogels also demonstrated rapid self-recovery, remarkable notch-insensitivity, self-healing capability, as well as excellent cytocompatibility towards stem cells. Accordingly, this work presents a new strategy towards fabricating self-repairing DPC-DN hydrogels with outstanding mechanical behaviors and biocompatibility. The new type of DN hydrogels demonstrates strong potentiality in many challenging biomedical applications such as artificial diaphragm, tendon, and cartilage.

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Preparation of PVA hydrogel with high-transparence and investigations of its transparent mechanism

Abstract: The PVA hydrogel with high-transparence has been prepared, the 1DMSO/2H2O network structure and the transparent mechanism were also explored.

Cited by 97 publications

References 39 publications

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Designing an All‐Solid‐State Tungsten Oxide Based Electrochromic Switch with a Superior Cycling Efficiency

Chitosan/Polyvinylpyrrolidone/MCM‐41 Composite Hydrogel Films: Structural, Thermal, Surface, and Antibacterial Properties

Dual Physically Cross-Linked κ-Carrageenan-Based Double Network Hydrogels with Superior Self-Healing Performance for Biomedical Application

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