Structural changes of water in poly(vinyl alcohol) hydrogel during dehydration

Kudo, Kushi; Ishida, Junichi; Syuu, Gika; Sekine, Yurina; Ikeda-Fukazawa, Tomoko

doi:10.1063/1.4862996

Cited by 127 publications

(94 citation statements)

References 28 publications

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“…Third, Raman spectroscopy and multimodal imaging can be used to investigate biochemical composition at a molecular level, but assessing protein structures at that scale was not the primary focus of this work. Lastly, water was mainly referred to as being bound or free; however, the complex water spectra suggest the presence of multiple distinct water fractions as suggested in previous studies (eg, weak vs strong hydrogen bonds, free, or bulk water) . Further analyses of the complex water spectra may provide insights into the structure of different water‐protein interactions in biological tissues, particularly with respect to age‐ or disease‐related changes.…”

Section: Discussionmentioning

confidence: 99%

Radial variation in biochemical composition of the bovine caudal intervertebral disc

et al. 2019

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Bovine caudal discs have been widely used in spine research due to their increased availability, large size, and mechanical and biochemical properties that are comparable to healthy human discs. However, despite their extensive use, the radial variations in bovine disc composition have not yet been rigorously quantified with high spatial resolution. Previous studies were limited to qualitative analyses or provided limited spatial resolution in biochemical properties. Thus, the main objective of this study was to provide quantitative measurements of biochemical composition with higher spatial resolution than previous studies that employed traditional biochemical techniques. Specifically, traditional biochemical analyses were used to measure water, sulfated glycosaminoglycan, collagen, and DNA contents. Gravimetric water content was compared to data obtained through Raman spectroscopy and differential scanning calorimetry. Additionally, spatial distribution of lipids in the disc's collagen network was visualized and quantified, for the first time, using multi‐modal second harmonic generation (SHG) and Coherent anti‐Stokes Raman (CARS) microscopy. Some heterogeneity was observed in the nucleus pulposus, where the water content and water‐to‐protein ratio of the inner nucleus were greater than the outer nucleus. In contrast, the bovine annulus fibrosus exhibited a more heterogeneous distribution of biochemical properties. Comparable results between orthohydroxyproline assay and SHG imaging highlight the potential benefit of using SHG microscopy as a less destructive method for measuring collagen content, particularly when relative changes are of interest. CARS images showed that lipid deposits were distributed equally throughout the disc and appeared either as individual droplets or as clusters of small droplets. In conclusion, this study provided a more comprehensive assessment of spatial variations in biochemical composition of the bovine caudal disc.

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Section: Discussionmentioning

confidence: 99%

Radial variation in biochemical composition of the bovine caudal intervertebral disc

et al. 2019

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“…Also, fibroblast laden PVA hydrogels exhibited extensive alkaline phosphatase activity confirming their healthy growth and function [115]. Also, the structural changes (e.g., shrinking) in water absorbed PVA hydrogel network during dehydration depend on the nature and density of physical or chemical crosslinking technique [116]. In other study, Sirousazar et is extensively free and hydrogen bonding is easier to form, consequently hydrogels become self-healable (possible mechanism of self-healing is shown in Fig.4) [119].…”

Section: Pure Pva-based Hydrogelsmentioning

confidence: 99%

PVA-based hydrogels for tissue engineering: A review

Kumar

Han

2016

International Journal of Polymeric Materials and Polymeric Biom

387

161

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Poly (vinyl alcohol) (PVA) is a hydrophilic polymer with excellent biocompatibility and has been applied in various biomedical areas due to its favorable properties. PVA-based hydrogels have been recognized as promising biomaterials and suitable candidate for tissue engineering applications and can be manipulated to act various critical roles.However, due to some disadvantages (i.e., lack of cell-adhesive property), it needs further modification for desired and targeted applications. This review highlights recent progress in the design and fabrication of PVA-based hydrogels, including cross-linking and processing techniques. Finally, major challenges and future perspectives in tissue engineering are briefly discussed. GRAPHICAL ABSTRACTDownloaded by [University of Sussex Library] at 08:36 28 June 2016 2

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“…Water molecules in PGF (saturated under RH = 100% and water uptake at 5.2 g g −1 ) can be wholly released within 7 min under 1 sun in the open air for a sample of 10 cm in diameter and 1 cm in thickness (red curve in Figure 4b). [35][36][37][38] Then, the average water evaporation rate decreases to be about 0.49 kg m −2 h −1 (from 300 to 420 s), with the surface temperature of PGF increasing at the end of the desorption process. The proposed reason should be that water desorption of PGF consumes most of the input solar energy and induces a low surface temperature.…”

Section: Doi: 101002/adma201905875mentioning

confidence: 99%

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

et al. 2019

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contaminated inevitably by the impurities, such as microorganisms, fine particulate matters (PM), and toxic gases like sulfur oxides (SO x ). [11,12] Recently, miscellaneous hygroscopic materials have been explored for moisture capture. For instance, metalorganic frameworks (MOFs) like MOF-801 could harvest 0.25 g g −1 water at a relative humidity (RH) of 20%, and poly(Nisopropyl acrylamide)/sodium alginate (PNIPAAm/Alg) polymer hydrogel demonstrated 0.6 g g −1 water uptake at the RH of 80%, respectively. [13][14][15][16] However, MOF-801 only worked in a narrow RH range (<20% RH) with low water uptake, and the quality of the oozed water from PNI-PAAm/Alg hydrogel was uncertain for the risk of impurities. As a result, it is still a big challenge for harvesting high-quality clean water free of impurities from the air within a full range of humidity.Herein, we demonstrate a highly efficient clean water production system from a contaminated environment with a wide range of humidity based on a rationally designed sodium polyacrylate (PAAS)/graphene framework (PGF). This porous framework with plentiful oxygen functional groups facilitates the sorption of water vapor in humid air and simultaneously grabs the impurities under van der Waals force (Figure 1). Moreover, a high solar-thermal conversion capability of PGF makes water easily desorbed under sun irradiation. [2,17,18] As a result, such a PGF presents the equilibrium water uptake of 0.14 g g −1 at a low RH of 15%, and a superhigh uptake of 5.20 g g −1 at an RH of 100%, exhibiting the excellent water uptake ability in a wide range of humidity. Under solar irradiation of 1 sun (1 kW m −2 ), the sorbed water can be quickly desorbed into vapor within a few minutes to generate clean water free of impurities. Thus, the PGF meets the requirements of efficient moisture capture, impurities filtration, and clean water production from natural air. For practical application, a lab-made prototype of moisture purification and water harvest (MPWH) system is built to collect over 25 L clean water per kilogram of PGF daily from the atmospheric environment. This PGF offers an efficient platform to capture moisture in ordinary and contaminated air for the production of high-quality clean water.The porous PGF is easily prepared through a convenient freeze-drying method (see details in Materials and Methods, Supporting Information). Typically, PAAS is well dispersed in a graphene oxide (GO) dispersion after ultrasonic treatment (Figure 2a). After the freeze-drying (Figure 2b) and reductionThe huge amount of moisture in the air is an unexplored and overlooked water resource in nature, which can be useful to solve the worldwide water shortage. However, direct water condensation from natural or even hazy air is always inefficient and inevitably contaminated by numerous impurities of dust, toxic gas, and microorganisms. In this regard, a drinkable and clean water harvester from complex contaminated air with a wide humidity range based on porous sodium polyacrylate/graphene framework (PGF...

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Structural changes of water in poly(vinyl alcohol) hydrogel during dehydration

Cited by 127 publications

References 28 publications

Radial variation in biochemical composition of the bovine caudal intervertebral disc

Radial variation in biochemical composition of the bovine caudal intervertebral disc

PVA-based hydrogels for tissue engineering: A review

Highly Efficient Clean Water Production from Contaminated Air with a Wide Humidity Range

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