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Locarno S, Arosio P, Curtoni F, Piazzoni M, Pignoli E, Gallo S. Microscopic and Macroscopic Characterization of Hydrogels Based on Poly(vinyl-alcohol)-Glutaraldehyde Mixtures for Fricke Gel Dosimetry. Gels 2024; 10:172. [PMID: 38534590 DOI: 10.3390/gels10030172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 03/28/2024] Open
Abstract
In recent decades, hydrogels have emerged as innovative soft materials with widespread applications in the medical and biomedical fields, including drug delivery, tissue engineering, and gel dosimetry. In this work, a comprehensive study of the macroscopic and microscopic properties of hydrogel matrices based on Poly(vinyl-alcohol) (PVA) chemically crosslinked with Glutaraldehyde (GTA) was reported. Five different kinds of PVAs differing in molecular weight and degree of hydrolysis were considered. The local microscopic organization of the hydrogels was studied through the use of the 1H nuclear magnetic resonance relaxometry technique. Various macroscopic properties (gel fraction, water loss, contact angle, swelling degree, viscosity, and Young's Modulus) were investigated with the aim of finding a correlation between them and the features of the hydrogel matrix. Additionally, an optical characterization was performed on all the hydrogels loaded with Fricke solution to assess their dosimetric behavior. The results obtained indicate that the degree of PVA hydrolysis is a crucial parameter influencing the structure of the hydrogel matrix. This factor should be considered for ensuring stability over time, a vital property in the context of potential biomedical applications where hydrogels act as radiological tissue-equivalent materials.
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Affiliation(s)
- Silvia Locarno
- Dipartimento di Fisica "Aldo Pontremoli", Università degli Studi di Milano, Via G. Celoria 16, 20133 Milano, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, Via G. Celoria 16, 20133 Milano, Italy
| | - Paolo Arosio
- Dipartimento di Fisica "Aldo Pontremoli", Università degli Studi di Milano, Via G. Celoria 16, 20133 Milano, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, Via G. Celoria 16, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 20133 Milano, Italy
| | - Francesca Curtoni
- Dipartimento di Fisica "Aldo Pontremoli", Università degli Studi di Milano, Via G. Celoria 16, 20133 Milano, Italy
| | - Marco Piazzoni
- Dipartimento di Fisica "Aldo Pontremoli", Università degli Studi di Milano, Via G. Celoria 16, 20133 Milano, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, Via G. Celoria 16, 20133 Milano, Italy
| | - Emanuele Pignoli
- Fondazione IRCCS "Istituto Nazionale dei Tumori", Via G. Venezian 1, 20133 Milano, Italy
| | - Salvatore Gallo
- Dipartimento di Fisica "Aldo Pontremoli", Università degli Studi di Milano, Via G. Celoria 16, 20133 Milano, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, Via G. Celoria 16, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 20133 Milano, Italy
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2
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Huang S, Villafranca SU, Mehta I, Yosfan O, Hong E, Wang A, Wu N, Wang Q, Rao S. A nanoscale inorganic coating strategy for stabilizing hydrogel neural probes in vivo. J Mater Chem B 2023; 11:7629-7640. [PMID: 37401386 PMCID: PMC10530439 DOI: 10.1039/d3tb00710c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
Hydrogels with adaptable optical and mechanical characteristics show considerable promise for light delivery in vivo with neuroengineering applications. However, the unlinked amorphous polymer chains within hydrogels can cause volumetric swelling after water absorption under physiological conditions over time. Chemically cross-linked poly(vinyl alcohol) (PVA) hydrogels showcase fatigue-resistant attributes and promising biocompatibility for the manufacture of soft neural probes. However, possible swelling of the PVA hydrogel matrix could impact the structural stability of hydrogel-based bioelectronics and their long-term in vivo functionality. In this study, we utilized an atomic layer deposition (ALD) technique to generate an inorganic, silicon dioxide (SiO2) coating layer on chemically cross-linked PVA hydrogel fibers. To evaluate the stability of SiO2-coated PVA hydrogel fibers mimicking the in vivo environment, we conducted accelerated stability tests. SiO2-coated PVA hydrogel fibers showed improved stability over a one-week incubation period under a harsh environment, preventing swelling and preserving their mechanical and optical properties compared to uncoated fibers. These SiO2-coated PVA hydrogel fibers demonstrated nanoscale polymeric crystalline domains (6.5 ± 0.1 nm), an elastic modulus of 73.7 ± 31.7 MPa, a maximum elongation of 113.6 ± 24.2%, and minimal light transmission loss (1.9 ± 0.2 dB cm-1). Lastly, we applied these SiO2-coated PVA hydrogel fibers in vivo to optically activate the motor cortex of transgenic Thy1::ChR2 mice during locomotor behavioral tests. This mouse cohort was genetically modified to express the light-sensitive ion channel, channelrhodopsin-2 (ChR2), and implanted with hydrogel fibers to deliver light to the motor cortex area (M2). Light stimulation via hydrogel fibers resulted in optogenetically modulated mouse locomotor behaviors, including increased contralateral rotation, mobility speeds, and travel distances.
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Affiliation(s)
- Sizhe Huang
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
| | | | - Iyanah Mehta
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
| | - Omri Yosfan
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
| | - Eunji Hong
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
| | - Anyang Wang
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA
| | - Nianqiang Wu
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA
| | - Qianbin Wang
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
| | - Siyuan Rao
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA 01003, USA.
- Institute for Applied Life Sciences, University of Massachusetts, Amherst, MA 01003, USA
- Neuroscience and Behavior Graduate Program, University of Massachusetts, Amherst, MA 01003, USA
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3
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Bawazir WA, Alsulami QA, Keshk SMAS. Augmentation in proton conductivity of crosslinked poly(vinyl alcohol) through the introduction of polyvinyl pyrrolidone. J Appl Polym Sci 2023. [DOI: 10.1002/app.53812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Affiliation(s)
- Wafa A. Bawazir
- Chemistry Department, Faculty of Science King Abdulaziz University Jeddah Saudi Arabia
| | - Qana A. Alsulami
- Chemistry Department, Faculty of Science King Abdulaziz University Jeddah Saudi Arabia
| | - Sherif M. A. S. Keshk
- Nanomaterials and System for Renewable Energy Laboratory, Research, and Technology Center of Energy Technoparc Borj Cedria Hammam Lif Tunisia
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4
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Wang Y, Wang X, Fu J, Yu J, Wang Y, Hu Z. Enhanced tensile properties of ultra‐high molecular weight polyethylene fibers by solubility improvement with mixed solvents. J Appl Polym Sci 2023. [DOI: 10.1002/app.53715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Yi Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering Donghua University Shanghai China
| | - Xinwei Wang
- State Key Laboratory of Polyolefins and Catalysis Shanghai Research Institute of Chemical Industry Shanghai China
- Shanghai Key Laboratory of Catalysis Technology for Polyolefins Shanghai Research Institute of Chemical Industry Shanghai China
| | - Jiabin Fu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering Donghua University Shanghai China
| | - Junrong Yu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering Donghua University Shanghai China
| | - Yan Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering Donghua University Shanghai China
| | - Zuming Hu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering Donghua University Shanghai China
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5
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Mao J, Liu Y, Chen L, Wang S. Preparation and properties of a double-crosslinked, high-strength polyvinyl alcohol/acylhydrazone self-healing hydrogel. INT J POLYM MATER PO 2023. [DOI: 10.1080/00914037.2022.2163641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jie Mao
- Department of Basic, Zhejiang Pharmaceutical University, Ningbo, China
| | - Yalei Liu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, China
| | - Lijun Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, China
| | - Sui Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, China
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Song M, Park J, Jeon J, Ha YG, Cho YR, Koo HJ, Kim W, Bae H. Application of poly (vinyl alcohol)-cryogels to immobilizing nitrifiers: Enhanced tolerance to shear stress-induced destruction and viability control. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 855:158835. [PMID: 36122708 DOI: 10.1016/j.scitotenv.2022.158835] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 06/15/2023]
Abstract
The hardness of poly (vinyl alcohol)-cryogels (PVA-CGs) was improved under three parameter conditions: 7.5 %-12.5 % PVA, 1-5 freezing-thawing cycles (FTCs), and the addition of 0 %-10 % glycerol as a cryoprotectant. This study investigated the effects of shear stress-induced destruction (SSID) on mechanical strength by inducing rapid erosion with a high frictional force. Tolerance to SSID (Tol-SSID) exhibited different sensitivities and trends depending on the above three fabrication parameters. The measured Tol-SSID exhibited consistent and inconsistent trends with tensile strength and swelling, respectively. Tol-SSID evaluation provides new insights into the practically meaningful mechanical strength of PVA-CGs against strong friction, which simulates extreme shear stress in a bioreactor. A PVA-CG with a PVA concentration of 10 % and in two FTCs resulted in Tol-SSID and tensile strength of 88.3 % and 0.59 kPa, respectively. Here, 5 % glycerol was added to maintain the bacterial respiration activity of immobilized nitrifiers of 0.097 mg-O2/g-VSS·min and survival of 88.6 %. The continuous mode of nitrification using the optimized PVA-CG for 10 days resulted in an ammonia removal rate of 0.2173 kg-N/m3·d, which is an improvement over cases without glycerol addition: 0.1426 and 0.1472 kg-N/m3·d for PVA-CGs in two and three FTCs, respectively.
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Affiliation(s)
- Minsu Song
- Department of Civil and Environmental Engineering, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea
| | - Jihye Park
- Department of Civil and Environmental Engineering, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea
| | - Junbeom Jeon
- Department of Civil and Environmental Engineering, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea; Institute for Environment and Energy, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea
| | - Yun-Geun Ha
- School of Materials Science and Engineering, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea
| | - Young-Rae Cho
- School of Materials Science and Engineering, Pusan National University, 63 Busandeahak-ro, Geumjeong-Gu, Busan 46241, Republic of Korea
| | - Hyung-Jun Koo
- Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea
| | - Woong Kim
- Department of Environmental Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hyokwan Bae
- Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea; Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
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7
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Yong H, Sommer JU. Cononsolvency Effect: When the Hydrogen Bonding between a Polymer and a Cosolvent Matters. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Huaisong Yong
- School of New Energy and Materials, Southwest Petroleum University, 610500Chengdu, China
- Sichuan Engineering Technology Research Center of Basalt Fiber Composites Development and Application, Southwest Petroleum University, 610500Chengdu, China
- Institute Theory of Polymers, Leibniz-Institut für Polymerforschung Dresden e.V., D-01069Dresden, Germany
| | - Jens-Uwe Sommer
- Institute Theory of Polymers, Leibniz-Institut für Polymerforschung Dresden e.V., D-01069Dresden, Germany
- Institute for Theoretical Physics, Technische Universität Dresden, D-01069Dresden, Germany
- Cluster of Excellence Physics of Life, Technische Universität Dresden, D-01307Dresden, Germany
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8
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Oliveira AS, Silva JC, Figueiredo L, Ferreira FC, Kotov NA, Colaço R, Serro AP. High-performance bilayer composites for the replacement of osteochondral defects. Biomater Sci 2022; 10:5856-5875. [DOI: 10.1039/d2bm00716a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Two novel bilayer constructs for the repair of osteochondral defects were developed from nanofibers and ceramic particles embedded into PVA matrices, exhibiting multiple promising properties similar to those of corresponding natural tissues.
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Affiliation(s)
- A. S. Oliveira
- Centro de Química Estrutural, Institute of Molecular Sciences and Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
- Instituto de Engenharia Mecânica and Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
| | - J. C. Silva
- Centre for Rapid and Sustainable Product Development, Politécnico de Leiria, Rua de Portugal – Zona Industrial, 2430-028 Marinha Grande, Portugal
- Institute for Bioengineering and Biosciences and Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
- Associate Laboratory i4HB – Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
| | - L. Figueiredo
- Bioceramed S.A., Rua José Gomes Ferreira 1 Arm. D, 2660-360 São Julião do Tojal, Portugal
| | - F. C. Ferreira
- Institute for Bioengineering and Biosciences and Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
- Associate Laboratory i4HB – Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
| | - N. A. Kotov
- Biointerfaces Institute and Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - R. Colaço
- Instituto de Engenharia Mecânica and Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
| | - A. P. Serro
- Centro de Química Estrutural, Institute of Molecular Sciences and Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz, Instituto Universitário Egas Moniz, Quinta da Granja, Monte de Caparica, 2829-511 Caparica, Portugal
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10
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Preparation of boron nitride nanofibers/PVA composite foam for environmental remediation. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125287] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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The Rheological Studies on Poly(vinyl) Alcohol-Based Hydrogel Magnetorheological Plastomer. Polymers (Basel) 2020; 12:polym12102332. [PMID: 33065979 PMCID: PMC7600437 DOI: 10.3390/polym12102332] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/12/2020] [Accepted: 10/12/2020] [Indexed: 11/16/2022] Open
Abstract
The freezing-thawing method has been commonly used in the preparation of polyvinyl alcohol hydrogel magnetorheological plastomer (PVA HMRP). However, this method is complex and time consuming as it requires high energy consumption and precise temperature control. In this study, PVA HMRP was prepared using a chemically crosslinked method, where borax is used as crosslinking agent capable of changing the rheological properties of the material. Three samples of PVA HMRP with various contents of carbonyl iron particles (CIPs) (50, 60, and 70 wt.%) were used to investigate their rheological properties in both steady shear and dynamic oscillation modes. Results showed the occurrence of shear thickening behaviour at low shear rate (γ > 1 s-1), where the viscosity increased with the increased of shear rate. Moreover, the storage modulus of the samples also increased increasing the oscillation frequency from 0.1 to 100 Hz. Interestingly, the samples with 50, 60 70 wt.% of CIPs produced large relative magnetorheological (MR) effects at 4916%, 6165%, and 10,794%, respectively. Therefore, the inclusion of borax to the PVA HMRP can offer solutions for a wide range of applications, especially in artificial muscle, soft actuators, and biomedical sensors.
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12
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Charron PN, Jacobs JI, Yao SX, Oldinski RA. Effects of cryo-processing on the mechanical and biological properties of poly(vinyl alcohol)-gelatin theta-gels. Biointerphases 2020; 15:051004. [PMID: 32962353 PMCID: PMC7511238 DOI: 10.1116/6.0000381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 08/17/2020] [Accepted: 08/31/2020] [Indexed: 12/24/2022] Open
Abstract
Poly(vinyl alcohol) (PVA), a synthetic, nontoxic polymer, is widely studied for use as a biomedical hydrogel due to its structural and physicomechanical properties. Depending on the synthesis method, PVA hydrogels can exhibit a range of selected characteristics-strength, creep resistance, energy dissipation, degree of crystallinity, and porosity. While the structural integrity and behavior of the hydrogel can be fine-tuned, common processing techniques result in a brittle, linear elastic material. In addition, PVA lacks functionality to engage and participate in cell adhesion, which can be a limitation for integrating PVA materials with tissue in situ. Thus, there is a need to further engineer PVA hydrogels to optimize its physicomechanical properties while enhancing cell adhesion and bioactivity. While the inclusion of gelatin into PVA hydrogels has been shown to impart cell-adhesive properties, the optimization of the mechanical properties of PVA-gelatin blends has not been studied in the context of traditional PVA hydrogel processing techniques. The incorporation of poly(ethylene glycol) with PVA prior to solidification forms an organized, cell instructive hydrogel with improved stiffness. The effect of cryo-processing, i.e., freeze-thaw (FT) cycling was elucidated by comparing 1 FT and 8 FT theta-cryo-gels and cryo-gels. To confirm the viability of the gels, human mesenchymal stem cell (hMSC) protein and sulfated glycosaminoglycan assays were performed to verify the nontoxicity and influence on hMSC differentiation. We have devised an elastic PVA-gelatin hydrogel utilizing the theta-gel and cryo-gel processing techniques, resulting in a stronger, more elastic material with greater potential as a scaffold for complex tissues.
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Affiliation(s)
- Patrick N Charron
- Department of Mechanical Engineering, University of Vermont, Burlington, Vermont 05405
| | - Jaime I Jacobs
- Civil and Environmental Engineering Department, University of Vermont, Burlington, Vermont 05405
| | - Selina X Yao
- Department of Mechanical Engineering, University of Vermont, Burlington, Vermont 05405
| | - Rachael A Oldinski
- Department of Mechanical Engineering, University of Vermont, Burlington, Vermont 05405
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Cheeney JE, Hsieh ST, Myung NV, Haberer ED. Whispering gallery mode emission from dye-doped polymer fiber cross-sections fabricated by near-field electrospinning. NANOSCALE 2020; 12:9873-9883. [PMID: 32347272 DOI: 10.1039/d0nr00147c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Whispering gallery mode (WGM) resonators demonstrate great potential for photonic and sensing applications. Yet, these devices are often disadvantaged by costly materials or complex fabrication approaches, in addition to lack of manufacturing scalability. Near-field electrospinning (NFES), a recently emerged facile fiber fabrication method, offers a solution. Here, WGM resonances are reported in Rhodamine 6G-doped poly(vinyl) alcohol (PVA) microfibers via NFES. Diameters are tuned over a range of more than 10 μm by varying substrate stage speed. Fibers display uniform distribution of dye, smooth surfaces, and circular cross-sections, all critical for supporting WGMs. High quality (Q) resonances are confirmed within fiber cross-sections through polarization experiments, free-spectral range analysis, and Mie-theory-derived mode assignment. In addition to WGMs, groups of associated spiral or conical modes are observed due to taper-induced weak optical confinement along the fiber axis. Crosslinked, dye-doped PVA fibers are utilized to sense the ethanol concentration in ethanol-water mixtures and actuation mechanisms are evaluated by comparison to theoretical spectra. The demonstration of high-Q resonances within NFES polymer microfibers is a critical step toward simple, cost effective, high-volume fabrication of WGM resonators for optoelectronics and biomedical devices.
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Affiliation(s)
- Joseph E Cheeney
- Materials Science and Engineering Program, University of California, Riverside, CA 92521, USA.
| | - Stephen T Hsieh
- Materials Science and Engineering Program, University of California, Riverside, CA 92521, USA.
| | - Nosang V Myung
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
| | - Elaine D Haberer
- Materials Science and Engineering Program, University of California, Riverside, CA 92521, USA. and Department of Electrical and Computer Engineering, University of California, Riverside, CA 92521, USA
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14
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Hapipi NM, Mazlan SA, Ubaidillah U, Abdul Aziz SA, Ahmad Khairi MH, Nordin NA, Nazmi N. Solvent Dependence of the Rheological Properties in Hydrogel Magnetorheological Plastomer. Int J Mol Sci 2020; 21:E1793. [PMID: 32151055 PMCID: PMC7084487 DOI: 10.3390/ijms21051793] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 11/16/2022] Open
Abstract
Chemically crosslinked hydrogel magnetorheological (MR) plastomer (MRP) embedded with carbonyl iron particles (CIPs) exhibits excellent magnetic performance (MR effect) in the presence of external stimuli especially magnetic field. However, oxidation and desiccation in hydrogel MRP due to a large amount of water content as a dispersing phase would limit its usage for long-term applications, especially in industrial engineering. In this study, different solvents such as dimethyl sulfoxide (DMSO) are also used to prepare polyvinyl alcohol (PVA) hydrogel MRP. Thus, to understand the dynamic viscoelastic properties of hydrogel MRP, three different samples with different solvents: water, DMSO, and their binary mixtures (DMSO/water) were prepared and systematically carried out using the oscillatory shear. The outcomes demonstrate that the PVA hydrogel MRP prepared from precursor gel with water shows the highest MR effect of 15,544% among the PVA hydrogel MRPs. However, the samples exhibit less stability and tend to oxidise after a month. Meanwhile, the samples with binary mixtures (DMSO/water) show an acceptable MR effect of 11,024% with good stability and no CIPs oxidation. Otherwise, the sample with DMSO has the lowest MR effect of 7049% and less stable compared to the binary solvent samples. This confirms that the utilisation of DMSO as a new solvent affects the rheological properties and stability of the samples.
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Affiliation(s)
- Norhiwani Mohd Hapipi
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia; (N.M.H.); (S.A.A.A.); (M.H.A.K.); (N.A.N.); (N.N.)
| | - Saiful Amri Mazlan
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia; (N.M.H.); (S.A.A.A.); (M.H.A.K.); (N.A.N.); (N.N.)
| | - U. Ubaidillah
- Mechanical Engineering Department, Faculty of Engineering, Universitas Sebelas Maret, Jl. Ir. Sutami 36A Kentingan Jebres, Surakarta 57126, Indonesia
- National Center for Sustainable Transportation Technology (NCSTT), Bandung 40132, Indonesia
| | - Siti Aishah Abdul Aziz
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia; (N.M.H.); (S.A.A.A.); (M.H.A.K.); (N.A.N.); (N.N.)
| | - Muntaz Hana Ahmad Khairi
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia; (N.M.H.); (S.A.A.A.); (M.H.A.K.); (N.A.N.); (N.N.)
| | - Nur Azmah Nordin
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia; (N.M.H.); (S.A.A.A.); (M.H.A.K.); (N.A.N.); (N.N.)
| | - Nurhazimah Nazmi
- Engineering Materials and Structures (eMast) iKohza, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia; (N.M.H.); (S.A.A.A.); (M.H.A.K.); (N.A.N.); (N.N.)
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15
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Albano LGS, Paulin JV, Trino LD, Fernandes SL, Graeff CFDO. Ultraviolet‐protective thin film based on PVA–melanin/rod‐coated silver nanowires and its application as a transparent capacitor. J Appl Polym Sci 2019. [DOI: 10.1002/app.47805] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | - João Vitor Paulin
- Department of PhysicsSão Paulo State University (UNESP), School of Sciences Bauru 17033‐360 Brazil
| | - Luciana Daniele Trino
- Department of PhysicsSão Paulo State University (UNESP), School of Sciences Bauru 17033‐360 Brazil
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16
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Ziv E, Attia D, Vasilyev G, Mendelson O, Zussman E, Yerushalmi-Rozen R. The role of polymer-solvent interactions in polyvinyl-alcohol dispersions of multi-wall carbon nanotubes: from coagulant to dispersant. SOFT MATTER 2018; 15:47-54. [PMID: 30431637 DOI: 10.1039/c8sm01866a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Dispersion of carbon nanotubes in solutions of polyvinyl-alcohol is required for solution casting of composite materials with improved interfacial adhesion where chains adsorbed on the nanotubes serve in the dual role of dispersant and compatible "connector" to the polyvinyl-alcohol matrix. Yet polyvinyl-alcohol is known to induce coagulation of nanotubes in aqueous solutions and thus far, it has not been used for dispersing pristine nanotubes. Here, we report that non-fully hydrolyzed (80-90%) polyvinyl-alcohol can be used for the preparation of stable, surfactant-free, dispersions of multi-wall carbon nanotubes in ethanol-water mixtures (of at least 50 vol% ethanol). Cryo-TEM imaging and rheological measurements of stable, long-lived dispersions reveal the formation of random networks of suspended tubes, with an averaged mesh size of ∼500 nm, indicating that the individual tubes do not aggregate or coagulate. We hypothesize that the polyvinyl-acetate sequences found in non-fully hydrolyzed polymers swell in the presence of ethanol, leading to the formation of a long-ranged steric (entropic) repulsion among polymer-decorated nanotubes. The unexpected role of the polyvinyl-acetate sequences along with a detailed dispersion mechanism are described.
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Affiliation(s)
- Efrat Ziv
- Department of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel.
| | - David Attia
- Department of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel.
| | - Gleb Vasilyev
- NanoEngineering Group, Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, 32000 Haifa, Israel
| | - Orit Mendelson
- Department of Chemistry, Nuclear Research Center-Negev, Beer-Sheva, Israel
| | - Eyal Zussman
- NanoEngineering Group, Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, 32000 Haifa, Israel
| | - Rachel Yerushalmi-Rozen
- Department of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel. and The Ilse Katz Institute for Nanoscience and Technology, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel
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17
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Jayaramudu T, Ko HU, Kim HC, Kim JW, Muthoka RM, Kim J. Electroactive Hydrogels Made with Polyvinyl Alcohol/Cellulose Nanocrystals. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1615. [PMID: 30181521 PMCID: PMC6163614 DOI: 10.3390/ma11091615] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 08/31/2018] [Accepted: 09/03/2018] [Indexed: 11/16/2022]
Abstract
This paper reports a nontoxic, soft and electroactive hydrogel made with polyvinyl alcohol (PVA) and cellulose nanocrystal (CNC). The CNC incorporating PVA-CNC hydrogels were prepared using a freeze⁻thaw technique with different CNC concentrations. Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy results proved the good miscibility of CNCs with PVA. The optical transparency, water uptake capacity and mechanical properties of the prepared hydrogels were investigated in this study. The CNC incorporating PVA-CNC hydrogels showed improved displacement output in the presence of an electric field and the displacement increased with an increase in the CNC concentration. The possible actuation mechanism was an electrostatic effect and the displacement improvement of the hydrogel associated with its enhanced dielectric properties and softness. Since the prepared PVA-CNC hydrogel is nontoxic and electroactive, it can be used for biomimetic soft robots, actively reconfigurable lenses and active drug-release applications.
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Affiliation(s)
- Tippabattini Jayaramudu
- Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea.
- Laboratory of Material Sciences, Instituto de Quimica de Recursos Naturales, Universidad de Talca, Talca 747, Chile.
| | - Hyun-U Ko
- Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea.
| | - Hyun Chan Kim
- Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea.
| | - Jung Woong Kim
- Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea.
| | - Ruth M Muthoka
- Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea.
| | - Jaehwan Kim
- Center for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100 Inha-Ro, Nam-Gu, Incheon 22212, Korea.
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18
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Irreversible Swelling Behavior and Reversible Hysteresis in Chemically Crosslinked Poly(vinyl alcohol) Gels. Gels 2018; 4:gels4020045. [PMID: 30674821 PMCID: PMC6209262 DOI: 10.3390/gels4020045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 05/06/2018] [Accepted: 05/14/2018] [Indexed: 11/17/2022] Open
Abstract
We report the swelling properties of chemically crosslinked poly(vinyl alcohol) (PVA) gels with high degrees of polymerization and hydrolysis. Physical crosslinking by microcrystallites was introduced in this chemical PVA gel by a simple dehydration process. The equilibrium swelling ratio was measured in several mixed solvents, which comprised two-components: a good solvent (water or dimethyl sulfoxide (DMSO)), and a poor organic solvent for PVA. In the case of aqueous/organic solvent mixtures subjected to a multiple-sample test, the swelling ratio decreased continuously when the concentration of the organic solvent increased, reaching a collapsed state in the respective pure organic solvents. In the case of DMSO, starting from a swollen state, the swelling ratio rapidly decreased by between 15 and 50 mol % when the concentration of the organic compound increased in a single-sample test. To understand the hysteresis phenomenon, the swelling ratio was measured in a DMSO/acetone mixed solvent, starting from a collapsed state in acetone. The reversibility of swelling in response to successive concentration cycles between DMSO and acetone was examined. As a result, an irreversible swelling behavior was observed in the first cycle, and the swelling ratio in acetone after the first cycle became larger than the initial ratio. Subsequently, the swelling ratio changed reversibly, with a large hysteresis near a specific molar ratio of DMSO/acetone of 60/40. The microstructures were confirmed by Fourier transform infrared spectroscopy during the cycles. The irreversible swelling behavior and hysteresis are discussed in terms of the destruction and re-formation of additional physical crosslinking in the chemical PVA gels.
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19
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Kwon K, Park K, Jung HT. Long-range single domain array of a 5 nm pattern of supramolecules via solvent annealing in a double-sandwich cell. NANOSCALE 2018; 10:8459-8470. [PMID: 29691547 DOI: 10.1039/c8nr01291a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In nanotechnology and microelectronics research, the generation of an ultradense, single-grain nanostructure with a long-range lateral order is challenging. In this paper, we report upon a new solvent-annealing method using a double-sandwich confinement to promote the formation of a large-area, single-domain array (>0.3 × 0.3 mm2) of supramolecular cylinders with a small feature size (4.7 nm). The in situ GISAXS experiment result shows the ordering process during solvent evaporation. The diffusion of the solvent molecules led to the disassembly of the supramolecules confined between the top and bottom surfaces and their subsequent mobilization, thereby producing a highly ordered hexagonal array of supramolecular materials under the double-sandwich confinement upon solvent evaporation. In addition, two key factors were found to be crucial in this process for generating highly-ordered supramolecular building blocks: (i) the presence of a top coat during solvent evaporation to provide a geometric confinement template, and (ii) the control of the solvent evaporation rate during the solvent evaporation step to provide the dendrimer sufficient time to self-assemble into the highly ordered state over a large area. Our developed approach, which can be extended to be used for a large family of supramolecules, is of critical importance in providing a new bottom-up lithographic method based on supramolecular self-assembly.
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Affiliation(s)
- Kiok Kwon
- Department of Chemical & Biomolecular Engineering (BK-21 plus) and KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Korea.
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21
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Semenova MV, Mezhuev YO, Osadchenko SV, Shtil’man MI. Kinetic features of the reaction of polyvinyl alcohol with epichlorohydrin in an alkaline medium. RUSS J GEN CHEM+ 2017. [DOI: 10.1134/s1070363217050255] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Zhi H, Fei X, Tian J, Jing M, Xu L, Wang X, Liu D, Wang Y, Liu J. A novel transparent luminous hydrogel with self-healing property. J Mater Chem B 2017; 5:5738-5744. [DOI: 10.1039/c7tb00975e] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A Luminous hydrogel with self-healing properties and biocompatibility was synthesized by a Eu-containing PVA with boric acid as a cross-linking agent.
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Affiliation(s)
- Hui Zhi
- Instrumental Analysis Center
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
- School of Biological Engineering
| | - Xu Fei
- Instrumental Analysis Center
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Jing Tian
- School of Biological Engineering
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Muzi Jing
- School of Biological Engineering
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Longquan Xu
- Instrumental Analysis Center
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Xiuying Wang
- Instrumental Analysis Center
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Dongmei Liu
- People's Liberation Army of China 93015 Troop
- Force Medical Team
- P. R. China
| | - Yi Wang
- School of Biological Engineering
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Jingyun Liu
- Instrumental Analysis Center
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
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Baptista JG, Rodrigues SP, Matsushita AF, Vitorino C, Maria TM, Burrows HD, Pais AA, Valente AJ. Does poly(vinyl alcohol) act as an amphiphilic polymer? An interaction study with simvastatin. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.07.025] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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24
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de Vries A, Hendriks J, van der Linden E, Scholten E. Protein Oleogels from Protein Hydrogels via a Stepwise Solvent Exchange Route. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13850-13859. [PMID: 26646108 DOI: 10.1021/acs.langmuir.5b03993] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We investigated the use of whey protein isolate (WPI) as oleogelator in liquid oil. First, heat-set WPI hydrogels were prepared varying in microstructure and network density. Then, by applying a stepwise solvent exchange procedure via an intermediate solvent, full replacement of the internal aqueous phase within the protein matrix by sunflower oil was achieved. The solvent exchange procedure was performed by using either acetone or tetrahydrofuran (THF) as intermediate solvent. The oil inside the protein matrix was homogeneously distributed without any noticeable damage to the structure. Analyzing the weight change of the protein gel as a result of the solvent exchange shows that the oil holding capacity depends on the microstructure, the polarity of the intermediate solvent, and the kinetics of the solvent exchange. Depending on the gel microstructure and protein concentration of the preceding hydrogel, the oil content in the oleogels was found to be as high as 91 wt %. Oil holding capacity correlated well with the water holding capacity of the preceding hydrogel, and its Young's modulus (stiffness). It was found that the oleogels, compared to the hydrogels, were much stiffer, as the Young's modulus increased by 2 orders of magnitude and showed a lower strain at fracture. Our novel route of structuring oil by immobilizing liquid oil inside a biodegradable protein gel matrix with tunable mechanical properties could be relevant for developing novel materials, e.g., in pharmaceutical, nutraceutical, and food applications.
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Affiliation(s)
- Auke de Vries
- Top Institute Food and Nutrition, Nieuwe Kanaal 9A, 6709 PA Wageningen, The Netherlands
- Laboratory of Physics and Physical Chemistry of Foods, Wageningen University , P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Jasper Hendriks
- Laboratory of Physics and Physical Chemistry of Foods, Wageningen University , P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Erik van der Linden
- Laboratory of Physics and Physical Chemistry of Foods, Wageningen University , P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Elke Scholten
- Top Institute Food and Nutrition, Nieuwe Kanaal 9A, 6709 PA Wageningen, The Netherlands
- Laboratory of Physics and Physical Chemistry of Foods, Wageningen University , P.O. Box 17, 6700 AA Wageningen, The Netherlands
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25
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Suzuki A, Sasaki S. Swelling and mechanical properties of physically crosslinked poly(vinyl alcohol) hydrogels. Proc Inst Mech Eng H 2015; 229:828-44. [DOI: 10.1177/0954411915615469] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Physically crosslinked poly(vinyl alcohol) gels are versatile biomaterials due to their excellent biocompatibility. In the past decades, physically crosslinked poly(vinyl alcohol) and poly(vinyl alcohol)-based hydrogels have been extensively studied for biomedical applications. However, these materials have not yet been implemented due to their mechanical strength. Physically crosslinked poly(vinyl alcohol) gels consist of a swollen amorphous network of poly(vinyl alcohol) physically crosslinked by microcrystallites. Although the mechanical properties can be improved to some extent by controlling the distribution of microcrystallites on the nano- and micro-scales, enhancing the mechanical properties while maintaining high water content remains very difficult. It may be technologically impossible to significantly improve the mechanical properties while keeping the gel’s high water absorbance ability using conventional fabrication methods. Physical and chemical understandings of the swelling and mechanical properties of physically crosslinked poly(vinyl alcohol) gels are considered here; some promising strategies for their practical applications are presented. This review focuses more on the recent studies on swelling and mechanical properties of poly(vinyl alcohol) hydrogels, prepared using only poly(vinyl alcohol) and pure water with no other chemicals, as potential biomedical materials.
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Affiliation(s)
- Atsushi Suzuki
- Department of Materials Science, Research Institute of Environment and Information Sciences, Yokohama National University, Yokohama, Japan
| | - Saori Sasaki
- Department of Materials Science, Research Institute of Environment and Information Sciences, Yokohama National University, Yokohama, Japan
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26
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Marega C, Maculan J, Andrea Rizzi G, Saini R, Cavaliere E, Gavioli L, Cattelan M, Giallongo G, Marigo A, Granozzi G. Polyvinyl alcohol electrospun nanofibers containing Ag nanoparticles used as sensors for the detection of biogenic amines. NANOTECHNOLOGY 2015; 26:075501. [PMID: 25627790 DOI: 10.1088/0957-4484/26/7/075501] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polyvinyl alcohol (PVA) electrospun nanofibers containing Ag nanoparticles (NPs) have been deposited on glass substrates. The aim of the work was to test the feasibility of this approach for the detection of biogenic amines by using either the Ag localized surface plasmon resonance quenching caused by the adsorption of amines on Ag NPs or by detecting the amines by surface enhanced Raman spectroscopy (SERS) after adsorption, from the gas phase, on the metal NPs. Two different approaches have been adopted. In the first one an ethanol/water solution containing AgNO3 was used directly in the electrospinning apparatus. In this way, a simple heat treatment of the nanofibers mat was sufficient to obtain the formation of Ag NPs inside the nanofibers and a partial cross-link of PVA. In the second procedure, the Ag NPs were deposited on PVA nanofibers by using the supersonic cluster beam deposition method, so that a beam of pure Ag NPs of controlled size was obtained. Exposure of the PVA mat to the beam produced a uniform distribution of the NPs on the nanofibers surface. Ethylendiamine vapors and volatile amines released from fresh shrimp meat were chemisorbed on the nanofibers mats. A SERS spectrum characterized by a diagnostic Ag-N stretching vibration at 230 cm(-1) was obtained. The results allow to compare the two different approaches in the detection of ammines.
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Affiliation(s)
- Carla Marega
- Dipartimento di Scienze Chimiche-Università degli Studi di Padova, Via Marzolo, 1 Padova I-35131, Italy
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27
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Biswas CS, Hazer B. Synthesis and characterization of stereoregular poly(N-ethylacrylamide) hydrogel by using Y(OTf)3 Lewis acid. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3399-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Production and Characterization of a New Bacterial Cellulose/Poly(Vinyl Alcohol) Nanocomposite. MATERIALS 2013; 6:1956-1966. [PMID: 28809253 PMCID: PMC5452496 DOI: 10.3390/ma6051956] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 04/23/2013] [Accepted: 05/06/2013] [Indexed: 11/18/2022]
Abstract
Bacterial cellulose (BC) is characterized for its high water holding capacity, high crystallinity, an ultrafine fiber network and high tensile strength. This work demonstrates the production of a new interpenetrated polymer network nanocomposite obtained through the incorporation of poly(vinyl alcohol) (PVA) on the BC matrix and evaluates the effect of oven drying on the morphological, mechanical and mass transfer properties of the composite membranes. Both the addition of PVA and oven drying induce the appearance of larger pores (circa 1–3 µm in average diameter) in dried BC/PVA membranes. Both types of treatments also affect the permeability of the composite, as assessed by the diffusion coefficients of polyethylene glycol (PEG) molecules (900, 8,000, 35,000 and 100,000 Da) across the membranes. Finally, the Young’s modulus of dry pristine BC decreases following PVA incorporation, resulting in a change from 3.5 GPa to 1 GPa and a five-fold loss in tensile strength.
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30
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Singh B, Lal H, Pal L, Sharma V. In vitro release profile of anti-ulcer drug rabeprazole from biocompatible psyllium-PVA hydrogels. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1021-1032. [PMID: 22367108 DOI: 10.1007/s10856-012-4582-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2011] [Accepted: 02/06/2012] [Indexed: 05/31/2023]
Abstract
The present article discusses the synthesis, characterization and haemocompatibility behaviour of the psyllium-PVA hydrogels prepared by chemical method in the presence of N,N'-methylenebisacrylamide. These hydrogels have been characterized by Fourier Transform infrared spectroscopy, thermo gravimetric analysis, swelling and drug release studies. The release of model drug rabeprazole sodium from the drug loaded hydrogels occurred through non-Fickian diffusion mechanism. Psyllium itself acts as anti-ulcer agent and release of rabeprazole from the drug loaded hydrogels may enhance the curing potential of the drug delivery device. The haemocompatibility was evaluated by studying the blood interactions with hydrogels with reference to thrombogenicity and haemolytic potential. Thrombogenicity results indicate that hydrogels are non-thrombogenic as the weight of clot formed and thrombus percentage for hydrogels was less than the positive control. The haemolytic index has been observed <5%. These observations indicate that these hydrogels are haemo-compatible and hence could be used for oral administration of antiulcer drugs.
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Affiliation(s)
- Baljit Singh
- Department of Chemistry, Himachal Pradesh University, Shimla, India.
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31
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Otsuka E, Sugiyama M, Suzuki A. Formation and destruction of physical crosslinks by mild treatments in chemically crosslinked poly(vinyl alcohol) gels. Polym Bull (Berl) 2011. [DOI: 10.1007/s00289-011-0450-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Singh B, Pal L. Radiation crosslinking polymerization of sterculia polysaccharide-PVA-PVP for making hydrogel wound dressings. Int J Biol Macromol 2011; 48:501-10. [PMID: 21262259 DOI: 10.1016/j.ijbiomac.2011.01.013] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 01/12/2011] [Accepted: 01/13/2011] [Indexed: 11/25/2022]
Abstract
The present study deals with the modification of sterculia gum by PVA-PVP through radiation crosslinking, to develop the hydrogels meant for the delivery of antimicrobial agent to the wounds. The hydrogels were characterized by SEM, FTIR, TGA and swelling studies. For the evaluation of swelling and drug release mechanism, the swelling kinetics and in vitro release dynamics of model drug from this matrix have been studied respectively in the solution of different pHs and simulated wound fluid. After 24h swelling per gram of the hydrogel has taken (17.03±0.19)g of simulated wound fluid and has released (0.230±0.01)mg of drug in the simulated fluid. The release of drug in simulated fluids occurred through non-Fickian diffusion mechanism.
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Affiliation(s)
- Baljit Singh
- Department of Chemistry, Himachal Pradesh University, Shimla 171005, India.
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Otsuka E, Kudo S, Sugiyama M, Suzuki A. Effects of microcrystallites on swelling behavior in chemically crosslinked poly(vinyl alcohol) gels. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/polb.22161] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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