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Journal articles on the topic 'Hydrogel thin films'

Author: Grafiati

Published: 25 May 2024

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1

Tamirisa, Prabhakar A., Jere Koskinen, and Dennis W. Hess. "Plasma polymerized hydrogel thin films." Thin Solid Films 515, no. 4 (December 2006): 2618–24. http://dx.doi.org/10.1016/j.tsf.2006.03.021.

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2

Tokarev, Ihor, and Sergiy Minko. "Stimuli-responsive hydrogel thin films." Soft Matter 5, no. 3 (2009): 511–24. http://dx.doi.org/10.1039/b813827c.

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3

Mateescu, Anca, Yi Wang, Jakub Dostalek, and Ulrich Jonas. "Thin Hydrogel Films for Optical Biosensor Applications." Membranes 2, no. 1 (February 8, 2012): 40–69. http://dx.doi.org/10.3390/membranes2010040.

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4

Suchaneck, Gunnar, Margarita Guenther, Joerg Sorber, Gerald Gerlach, Karl-Friedrich Arndt, Alexander Deyneka, and Lubomir Jastrabik. "Plasma surface modification of hydrogel thin films." Surface and Coatings Technology 174-175 (September 2003): 816–20. http://dx.doi.org/10.1016/s0257-8972(03)00584-x.

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5

Tsuji, Sakiko, and Haruma Kawaguchi. "Colored Thin Films Prepared from Hydrogel Microspheres." Langmuir 21, no. 18 (August 2005): 8439–42. http://dx.doi.org/10.1021/la050271t.

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6

South, Antoinette B, and L. Andrew Lyon. "Autonomic Self-Healing of Hydrogel Thin Films." Angewandte Chemie International Edition 49, no. 4 (December 22, 2009): 767–71. http://dx.doi.org/10.1002/anie.200906040.

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7

South, Antoinette B, and L. Andrew Lyon. "Autonomic Self-Healing of Hydrogel Thin Films." Angewandte Chemie 122, no. 4 (December 22, 2009): 779–83. http://dx.doi.org/10.1002/ange.200906040.

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8

Lee, Jeong Hyun, Aline T. Santoso, Emily S. Park, Kerryn Matthews, Simon P. Duffy, and Hongshen Ma. "Lossless immunocytochemistry using photo-polymerized hydrogel thin-films." Analyst 145, no. 8 (2020): 2897–903. http://dx.doi.org/10.1039/c9an02503k.

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9

Unger, Katrin, Marlene Anzengruber, and Anna Maria Coclite. "Measurements of Temperature and Humidity Responsive Swelling of Thin Hydrogel Films by Interferometry in an Environmental Chamber." Polymers 14, no. 19 (September 23, 2022): 3987. http://dx.doi.org/10.3390/polym14193987.

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Thin film thermo-responsive hydrogels have become a huge interest in applications such as smart drug-delivery systems or sensor/actuator technology. So far, mostly, the response of such hydrogels has been measured only by varying the temperature in a liquid environment, but studies of the response towards humidity and temperature are rare because of experimental limitations. Often the swelling measurements are performed on samples placed on a stage that can be heated/cooled, while vapors enter the permeation chamber at their own temperature. This thermal difference leads to some uncertainties on the exact relative humidity to which the sample is exposed to. In this study, we explored the possibility of performing swelling measurements under thermal equilibrium by placing the sample and an interferometer, as a detector, in an environmental chamber and therefore exposing the smart hydrogel to adjustable temperatures and relative humidity conditions while measuring the hydrogel’s thin film thickness changes. As a case study, we used thin films of the thermo-responsive hydrogel, poly N-vinylcaprolactam deposited by initiated chemical vapor deposition (iCVD). Similar thin films were previously characterized by in situ ellipsometry while the sample was heated on a stage and exposed to humid air produced at room temperature. The comparison between the two measurement methods showed that while measurements in the presence of thermal gradients are limited mostly to low humidity, measurements in thermal equilibrium are restricted only by the operation limits of the used environmental chamber.

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10

De Giglio, E., D. Cafagna, MM Giangregorio, M. Domingos, M. Mattioli-Belmonte, and S. Cometa. "PHEMA-based thin hydrogel films for biomedical applications." Journal of Bioactive and Compatible Polymers 26, no. 4 (June 17, 2011): 420–34. http://dx.doi.org/10.1177/0883911511410460.

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11

Delavoipière, Jessica, Yvette Tran, Emilie Verneuil, Bertrand Heurtefeu, Chung Yuen Hui, and Antoine Chateauminois. "Friction of Poroelastic Contacts with Thin Hydrogel Films." Langmuir 34, no. 33 (July 20, 2018): 9617–26. http://dx.doi.org/10.1021/acs.langmuir.8b01466.

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12

Muralter, Fabian, Alberto Perrotta, and Anna Maria Coclite. "Thickness-Dependent Swelling Behavior of Vapor-Deposited Hydrogel Thin Films." Proceedings 2, no. 13 (December 3, 2018): 757. http://dx.doi.org/10.3390/proceedings2130757.

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Hydrogel thin films containing temperature sensitive chemical functionalities (such as N-isopropylacrylamide, NIPAAm) are particularly interesting for sensor and actuator setups. Complex 3D structures can be conformally coated by the solvent free technique initiated Chemical Vapor Deposition, with precise control over chemical composition and film thickness. In this study, NIPAAm-based thin films with film thicknesses ranging from tens to several hundreds of nanometers and with different amounts of cross-linking were deposited. Above the lower critical solution temperature (LCST), these films repel out water and hence shrink. The amount of cross-linking and the deposited film thickness were successfully identified to both affect shape and position of the LCST transition of these systems: a promising basis for tuning response properties.

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13

Chollet, Benjamin, Mengxing Li, Ekkachai Martwong, Bruno Bresson, Christian Fretigny, Patrick Tabeling, and Yvette Tran. "Multiscale Surface-Attached Hydrogel Thin Films with Tailored Architecture." ACS Applied Materials & Interfaces 8, no. 18 (April 29, 2016): 11729–38. http://dx.doi.org/10.1021/acsami.6b00446.

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14

White, Evan M., Jeremy Yatvin, Joe B. Grubbs, Jenna A. Bilbrey, and Jason Locklin. "Advances in smart materials: Stimuli-responsive hydrogel thin films." Journal of Polymer Science Part B: Polymer Physics 51, no. 14 (May 22, 2013): 1084–99. http://dx.doi.org/10.1002/polb.23312.

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15

Kamarun, Dzaraini, Ahmat Norizan, Steffi Krause, Chris Hunter, and Lilia Milanesi. "Degradation Behaviour of Thin Polymer Films of Poly(Amide Ester) Hydrogel Using Quartz Crystal Microbalance." Advanced Materials Research 812 (September 2013): 38–45. http://dx.doi.org/10.4028/www.scientific.net/amr.812.38.

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Quartz Crystal Microbalance (QCM) has been typically used as a mass sensor in the study of monolayer and multilayer depositions and dissolution, mass transport in polymer films on electrodes, corrosion processes at electrodes and mass changes caused by protein adsorption at electrodes. Thin films of an aromatic poly (amide ester) hydrogel with hydrolyzable cross links were prepared in-situ on a gold-coated quartz crystal which is the transducing element of a Quartz Crystal Microbalance (QCM). Here we report the synthesis and degradation behavior of an aromatic poly (amide ester) hydrogel with hydrolyzable cross links using QCM. Degradation of the hydrogel films was found to proceed with Δf increment, indicating mass decrease and is in line with the theory proposed by Sauerbrey. Films with a higher cross-link density underwent partial degradation with swelling; and are depicted as a decrease in the Δf values with time. Deviation from the general base catalysis of ester hydrolysis was observed at higher base concentration due to the biphasic environment of the hydrolysis reaction.

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16

Ciapa, Lola, Jessica Delavoipière, Yvette Tran, Emilie Verneuil, and Antoine Chateauminois. "Transient sliding of thin hydrogel films: the role of poroelasticity." Soft Matter 16, no. 28 (2020): 6539–48. http://dx.doi.org/10.1039/d0sm00641f.

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17

Ouyang, Xiaozhi, Cheng Huang, Sha Cheng, Pengchao Zhang, and Wen Chen. "Microfluidic-Based Continuous Fabrication of Ultrathin Hydrogel Films with Controllable Thickness." Polymers 15, no. 13 (June 30, 2023): 2905. http://dx.doi.org/10.3390/polym15132905.

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Ultrathin hydrogel films composed of cross-linked polymer networks swollen by water, with soft and moisturized features similar to biological tissue, play a vital role in flexible biosensors and wearable electronics. However, achieving efficient and continuous fabrication of such films remains a challenge. Here, we present a microfluidic-based strategy for the continuous fabrication of free-standing ultrathin hydrogel films by using laminar flow, which can be precisely controlled in the micrometer scale. Compared with conventional methods, the microfluidic-based method shows advantages in producing hydrogel films with a high homogeneity as well as maintaining the structural integrity, without the need of supporting substrates and sophisticated equipment. This strategy allows the precise control over the thickness of the hydrogel films ranging from 15 ± 0.2 to 39 ± 0.5 μm, by adjusting the height of the microfluidic channels, with predictable opportunities for scaling up. Therefore, our strategy provides a facile route to produce advanced thin polymer films in a universal, steerable, and scalable manner and will promote the applications of thin polymer films in biosensors and wearable electronics.

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18

Tai, Feng-I., Olof Sterner, Olof Andersson, Tobias Ekblad, and Thomas Ederth. "pH-control of the protein resistance of thin hydrogel gradient films." Soft Matter 10, no. 32 (2014): 5955–64. http://dx.doi.org/10.1039/c4sm00833b.

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19

Naficy, Sina, Geoffrey M. Spinks, and Gordon G. Wallace. "Thin, Tough, pH-Sensitive Hydrogel Films with Rapid Load Recovery." ACS Applied Materials & Interfaces 6, no. 6 (March 14, 2014): 4109–14. http://dx.doi.org/10.1021/am405708v.

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20

Delgado, David E., Daniel R. King, Kunpeng Cui, Jian Ping Gong, and Kenneth R. Shull. "High-Fidelity Hydrogel Thin Films Processed from Deep Eutectic Solvents." ACS Applied Materials & Interfaces 12, no. 38 (August 21, 2020): 43191–200. http://dx.doi.org/10.1021/acsami.0c09618.

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21

Nagamine, Kuniaki, Takuya Hirata, Kohei Okamoto, Yuina Abe, Hirokazu Kaji, and Matsuhiko Nishizawa. "Portable Micropatterns of Neuronal Cells Supported by Thin Hydrogel Films." ACS Biomaterials Science & Engineering 1, no. 5 (April 29, 2015): 329–34. http://dx.doi.org/10.1021/acsbiomaterials.5b00020.

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22

Smith, O'Neil, and Seong S. Seo. "Ferrocenedimethanol Transport in Thin Films Consisting of Laponite and Hydrogel." IEEE Sensors Journal 8, no. 6 (June 2008): 871–73. http://dx.doi.org/10.1109/jsen.2008.923267.

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23

González-Henríquez, Carmen M., Diego F. Veliz-Silva, Mauricio A. Sarabia-Vallejos, Adolfo del Campo-García, and Juan Rodríguez-Hernández. "Micrometric Wrinkled Patterns Spontaneously Formed on Hydrogel Thin Films via Argon Plasma Exposure." Molecules 24, no. 4 (February 19, 2019): 751. http://dx.doi.org/10.3390/molecules24040751.

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The generation of microstructured patterns on the surface of a specific polymeric material could radically improve their performance in a particular application. Most of the interactions with the environment occur at the material interface; therefore, increasing the exposed active surface considerably improves their range of application. In this article, a simple and reliable protocol to form spontaneous wrinkled patterns using a hydrogel layer is reported. For this purpose, we took advantage of the doctor blade technique in order to generate homogenous films over solid substrates with controlled thickness and large coverage. The hydrogel wrinkle formation involves a prepolymerization step which produces oligomers leading to a solution with increased viscosity, enough for doctor blade deposition. Subsequently, the material was exposed to vacuum and plasma to trigger wrinkled pattern formation. Finally, a UV-polymerization treatment was applied to fix the undulations on top. Interestingly, the experimental parameters allowed us to finely tune the wrinkle characteristics (period, amplitude, and orientation). For this study, two main aspects were explored. The first one is related to the role of the substrate functionalization on the wrinkle formation. The second study correlates the deswelling time and its relationship with the dimensions and distribution of the wrinkle pattern. In the first batch, four different 3-(trimethoxysilyl)propyl methacrylate (TSM) concentrations were used to functionalize the substrate in order to enhance the adhesion between hydrogel film and the substrate. The wrinkles formed were characterized in terms of wrinkle amplitude, wavelength, pattern roughness, and surface Young modulus, by using AFM in imaging and force spectroscopy modes. Moreover, the chemical composition of the hydrogel film cross-section and the effect of the plasma treatment were analyzed with confocal Raman spectroscopy. These results demonstrated that an oxidized layer was formed on top of the hydrogel films due to the exposure to an argon plasma.

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24

Ohsedo, Yutaka, and Ami Kaneizumi. "The Preparation of Electrolyte Hydrogels with the Water Solubilization of Polybenzoxazine." Gels 9, no. 10 (October 14, 2023): 819. http://dx.doi.org/10.3390/gels9100819.

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Polybenzoxazine (PBZ) exhibits excellent heat resistance, and PBZ derivatives have been designed and synthesized to achieve high performance. However, the application range of PBZ is limited by the strong interactions between molecular chains and its low solubility in organic solvents, thereby limiting its processability. This study focused on the benzoxazine structure as the molecular backbone of new hydrogel materials that can be applied as electrolyte materials and prepared functional gel materials. Here, we prepared hydrogels by water-solubilizing PBZ derivatives, which typically exhibit low solubility in organic solvents. Although studies on the hydrophilization of PBZ and its complexation with hydrophilic polymers have been conducted, no studies have been performed on the hydrogelation of PBZ. First, the phenol in the organic solvent-insoluble PBZ thin film obtained after the thermal ring-opening polymerization of the monomer was transformed into sodium phenoxide by immersion in a NaOH aqueous solution to water-solubilize it and obtain a hydrogel thin film. Although the hydrogel thin film exhibited low mechanical strength, a free-standing hydrogel film with improved strength was obtained through the double network gelation method with an acrylamide monomer system. The physical properties of the polymer composite hydrogel thin film were evaluated. The ionic conductivity of the hydrogel thin films was in the order of 10−4 S cm−1, indicating the potential of PBZ as an electrolyte hydrogel material. However, improving its ionic conductivity will be undertaken in future studies.

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25

Muya, Francis Ntumba, Xolani Terrance Ngema, Priscilla Gloria Lorraine Baker, and Emmanuel Iheanyichukwu Iwuoha. "Sensory Properties of Polysulfone Hydrogel for Electro-Analytical Profiling of Vanadium and Selenium in Aqueous Solutions." Journal of Nano Research 44 (November 2016): 142–57. http://dx.doi.org/10.4028/www.scientific.net/jnanor.44.142.

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Hydrogels have been a topic of extensive research because of their unique bulk and surface properties. They play a vital role in development of controlled release drug delivery systems. Polysulfone hydrogels are hydrophilic porous materials, which provide the advantage of biocompatibility and effective orientation of biomolecule in the design of the novel biosensors [1-2]. Polysulfone hydrogels may be prepared as water swellable powders or drop cast as thin films on screen printed carbon electrodes (SPCE). Polysulfone hydrogels produce electroactive thin films, characterized by 2 well resolved redox peaks, with a formal potential of 0.0867 V and diffusion coefficient in aqueous medium of 9.06e-9 Cm2/s. In this paper we report on the initial speciation studies and analytical performance of Selenium and Vanadium at the hydrogel electrodes, as evaluated by using cyclic voltammetry in a range of -0.7 V to +0.0 V versus Ag/AgCl. The morphology, adsorption and thin film integrity was evaluated using High resolution scanning electron microscopy (HR-SEM), UV-Vis and Raman spectroscopy.

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26

Pemble, Oliver J., Maria Bardosova, Ian M. Povey, and Martyn E. Pemble. "A Slot-Die Technique for the Preparation of Continuous, High-Area, Chitosan-Based Thin Films." Polymers 13, no. 10 (May 13, 2021): 1566. http://dx.doi.org/10.3390/polym13101566.

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Chitosan-based films have a diverse range of potential applications but are currently limited in terms of commercial use due to a lack of methods specifically designed to produce thin films in high volumes. To address this limitation directly, hydrogels prepared from chitosan, chitosan-tetraethoxy silane, also known as tetraethyl orthosilicate (TEOS) and chitosan-glutaraldehyde have been used to prepare continuous thin films using a slot-die technique which is described in detail. By way of preliminary analysis of the resulting films for comparison purposes with films made by other methods, the mechanical strength of the films produced was assessed. It was found that as expected, the hybrid films made with TEOS and glutaraldehyde both show a higher yield strength than the films made with chitosan alone. In all cases, the mechanical properties of the films were found to compare very favorably with similar measurements reported in the literature. In order to assess the possible influence of the direction in which the hydrogel passes through the slot-die on the mechanical properties of the films, testing was performed on plain chitosan samples cut in a direction parallel to the direction of travel and perpendicular to this direction. It was found that there was no evidence of any mechanical anisotropy induced by the slot die process. The examples presented here serve to illustrate how the slot-die approach may be used to create high-volume, high-area chitosan-based films cheaply and rapidly. It is suggested that an approach of the type described here may facilitate the use of chitosan-based films for a wide range of important applications.

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27

Pele, Karinna Georgiana, Hippolyte Amaveda, Mario Mora, Carlos Marcuello, Anabel Lostao, Pilar Alamán-Díez, Salvador Pérez-Huertas, María Ángeles Pérez, José Manuel García-Aznar, and Elena García-Gareta. "Hydrocolloids of Egg White and Gelatin as a Platform for Hydrogel-Based Tissue Engineering." Gels 9, no. 6 (June 20, 2023): 505. http://dx.doi.org/10.3390/gels9060505.

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Innovative materials are needed to produce scaffolds for various tissue engineering and regenerative medicine (TERM) applications, including tissue models. Materials derived from natural sources that offer low production costs, easy availability, and high bioactivity are highly preferred. Chicken egg white (EW) is an overlooked protein-based material. Whilst its combination with the biopolymer gelatin has been investigated in the food technology industry, mixed hydrocolloids of EW and gelatin have not been reported in TERM. This paper investigates these hydrocolloids as a suitable platform for hydrogel-based tissue engineering, including 2D coating films, miniaturized 3D hydrogels in microfluidic devices, and 3D hydrogel scaffolds. Rheological assessment of the hydrocolloid solutions suggested that temperature and EW concentration can be used to fine-tune the viscosity of the ensuing gels. Fabricated thin 2D hydrocolloid films presented globular nano-topography and in vitro cell work showed that the mixed hydrocolloids had increased cell growth compared with EW films. Results showed that hydrocolloids of EW and gelatin can be used for creating a 3D hydrogel environment for cell studies inside microfluidic devices. Finally, 3D hydrogel scaffolds were fabricated by sequential temperature-dependent gelation followed by chemical cross-linking of the polymeric network of the hydrogel for added mechanical strength and stability. These 3D hydrogel scaffolds displayed pores, lamellae, globular nano-topography, tunable mechanical properties, high affinity for water, and cell proliferation and penetration properties. In conclusion, the large range of properties and characteristics of these materials provide a strong potential for a large variety of TERM applications, including cancer models, organoid growth, compatibility with bioprinting, or implantable devices.

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28

Wiener, Clinton G., R. A. Weiss, and Bryan D. Vogt. "Overcoming confinement limited swelling in hydrogel thin films using supramolecular interactions." Soft Matter 10, no. 35 (2014): 6705–12. http://dx.doi.org/10.1039/c4sm00815d.

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29

Werzer, Oliver, Stephan Tumphart, Roman Keimel, Paul Christian, and Anna Maria Coclite. "Drug release from thin films encapsulated by a temperature-responsive hydrogel." Soft Matter 15, no. 8 (2019): 1853–59. http://dx.doi.org/10.1039/c8sm02529k.

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30

Suraniti, Emmanuel, Solange Vivès, Seiya Tsujimura, and Nicolas Mano. "Designing Thin Films of Redox Hydrogel for Highly Efficient Enzymatic Anodes." Journal of The Electrochemical Society 160, no. 6 (2013): G79—G82. http://dx.doi.org/10.1149/2.072306jes.

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31

Delavoipière, Jessica, Bertrand Heurtefeu, Jérémie Teisseire, Antoine Chateauminois, Yvette Tran, Marc Fermigier, and Emilie Verneuil. "Swelling Dynamics of Surface-Attached Hydrogel Thin Films in Vapor Flows." Langmuir 34, no. 50 (November 19, 2018): 15238–44. http://dx.doi.org/10.1021/acs.langmuir.8b03206.

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32

Nitschke, M., S. Zschoche, A. Baier, F. Simon, and C. Werner. "Low pressure plasma immobilization of thin hydrogel films on polymer surfaces." Surface and Coatings Technology 185, no. 1 (July 2004): 120–25. http://dx.doi.org/10.1016/j.surfcoat.2003.12.006.

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33

Abdelaty, Momen S. A. "Environmental Functional Photo-Cross-Linked Hydrogel Bilayer Thin Films from Vanillin." Journal of Polymers and the Environment 26, no. 6 (October 9, 2017): 2243–56. http://dx.doi.org/10.1007/s10924-017-1126-y.

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34

Pena-Francesch, Abdon, Laura Montero, and Salvador Borrós. "Tailoring the LCST of Thermosensitive Hydrogel Thin Films Deposited by iCVD." Langmuir 30, no. 24 (June 11, 2014): 7162–67. http://dx.doi.org/10.1021/la5003594.

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35

Cao, Zheng, Binyang Du, Tianyou Chen, Haotian Li, Junting Xu, and Zhiqian Fan. "Fabrication and Properties of Thermosensitive Organic/Inorganic Hybrid Hydrogel Thin Films." Langmuir 24, no. 10 (May 2008): 5543–51. http://dx.doi.org/10.1021/la8000653.

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36

Moreau, David, Caroline Chauvet, François Etienne, François P. Rannou, and Laurent Corté. "Hydrogel films and coatings by swelling-induced gelation." Proceedings of the National Academy of Sciences 113, no. 47 (November 7, 2016): 13295–300. http://dx.doi.org/10.1073/pnas.1609603113.

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Hydrogel films used as membranes or coatings are essential components of devices interfaced with biological systems. Their design is greatly challenged by the need to find mild synthesis and processing conditions that preserve their biocompatibility and the integrity of encapsulated compounds. Here, we report an approach to produce hydrogel films spontaneously in aqueous polymer solutions. This method uses the solvent depletion created at the surface of swelling polymer substrates to induce the gelation of a thin layer of polymer solution. Using a biocompatible polymer that self-assembles at high concentration [poly(vinyl alcohol)], hydrogel films were produced within minutes to hours with thicknesses ranging from tens to hundreds of micrometers. A simple model and numerical simulations of mass transport during swelling capture the experiments and predict how film growth depends on the solution composition, substrate geometry, and swelling properties. The versatility of the approach was verified with a variety of swelling substrates and hydrogel-forming solutions. We also demonstrate the potential of this technique by incorporating other solutes such as inorganic particles to fabricate ceramic-hydrogel coatings for bone anchoring and cells to fabricate cell-laden membranes for cell culture or tissue engineering.

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37

Zhang, Lihua, Yuhong Ma, Changwen Zhao, Xing Zhu, Ruichao Chen, and Wantai Yang. "Synthesis of pH-responsive hydrogel thin films grafted on PCL substrates for protein delivery." Journal of Materials Chemistry B 3, no. 39 (2015): 7673–81. http://dx.doi.org/10.1039/c5tb01149c.

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38

Menegatti, Tadej, and Polona Žnidaršič-Plazl. "Copolymeric Hydrogel-Based Immobilization of Yeast Cells for Continuous Biotransformation of Fumaric Acid in a Microreactor." Micromachines 10, no. 12 (December 10, 2019): 867. http://dx.doi.org/10.3390/mi10120867.

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Although enzymatic microbioreactors have recently gained lots of attention, reports on the use of whole cells as biocatalysts in microreactors have been rather modest. In this work, an efficient microreactor with permeabilized Saccharomyces cerevisiae cells was developed and used for continuous biotransformation of fumaric into industrially relevant L-malic acid. The immobilization of yeast cells was achieved by entrapment in a porous structure of various hydrogels. Copolymers based on different ratios of sodium alginate (SA) and polyvinyl alcohol (PVA) were used for hydrogel formation, while calcium chloride and boric or phenylboronic acid were tested as crosslinking agents for SA and PVA, respectively. The influence of hydrogel composition on physico-chemical properties of hydrogels prepared in the form of thin films was evaluated. Immobilization of permeabilized S. cerevisiae cells in the selected copolymeric hydrogel resulted in up to 72% retained fumarase activity. The continuous biotransformation process using two layers of hydrogels integrated into a two-plate microreactor revealed high space time yield of 2.86 g/(L·h) while no activity loss was recorded during 7 days of continuous operation.

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39

Buchberger, Anton, Sebastian Peterka, Anna Coclite, and Alexander Bergmann. "Fast Optical Humidity Sensor Based on Hydrogel Thin Film Expansion for Harsh Environment." Sensors 19, no. 5 (February 26, 2019): 999. http://dx.doi.org/10.3390/s19050999.

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With the application of a recently developed deposition method called initiated chemical vapor deposition (iCVD), responsive hydrogel thin films in the order of a few hundred nanometers were created. When in contact with humid air, the hydrogel layer increases its thickness considerably. The measurement of the thickness change was realized interferometrically with a laser and a broadband light source in two different implementations. The relative change in thickness with respect to humidity can be described with the Flory–Huggins theory. The required Flory–Huggins interaction parameter was determined for the actual hydrogel composition. The setup was designed without electric components in the vicinity of the active sensor layer and is therefore applicable in harsh environments such as explosive or corrosive ones. The implemented sensor prototype delivered reproducible relative humidity ( R H ) values and the achieved response time for an abrupt change of the humidity τ 63 ≤ 2.5 s was about three times faster compared to one of the fastest commercially available sensors on the market.

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40

Martwong, Ekkachai, and Yvette Tran. "Lower Critical Solution Temperature Phase Transition of Poly(PEGMA) Hydrogel Thin Films." Langmuir 37, no. 28 (July 8, 2021): 8585–93. http://dx.doi.org/10.1021/acs.langmuir.1c01165.

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41

Reddy, Nitin Ramesh, Samuel Rhodes, and Jiyu Fang. "Colorimetric Detection of Dopamine with J-Aggregate Nanotube-Integrated Hydrogel Thin Films." ACS Omega 5, no. 29 (July 17, 2020): 18198–204. http://dx.doi.org/10.1021/acsomega.0c01803.

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42

Montero, Laura, Salmaan H. Baxamusa, Salvador Borros, and Karen K. Gleason. "Thin Hydrogel Films With Nanoconfined Surface Reactivity by Photoinitiated Chemical Vapor Deposition." Chemistry of Materials 21, no. 2 (January 27, 2009): 399–403. http://dx.doi.org/10.1021/cm802737m.

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43

Schmaljohann, Dirk, Detlev Beyerlein, Mirko Nitschke, and Carsten Werner. "Thermo-Reversible Swelling of Thin Hydrogel Films Immobilized by Low-Pressure Plasma." Langmuir 20, no. 23 (November 2004): 10107–14. http://dx.doi.org/10.1021/la034653f.

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44

Fellows, Alexander P., Mike T. L. Casford, and Paul B. Davies. "Infrared Nanospectroscopy of Air-Sensitive Biological Substrates Protected by Thin Hydrogel Films." Biophysical Journal 119, no. 8 (October 2020): 1474–80. http://dx.doi.org/10.1016/j.bpj.2020.09.007.

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Takahashi, Riku, Hiroki Miyazako, Aya Tanaka, Yuko Ueno, and Masumi Yamaguchi. "Tough, permeable and biocompatible microfluidic devices formed through the buckling delamination of soft hydrogel films." Lab on a Chip 21, no. 7 (2021): 1307–17. http://dx.doi.org/10.1039/d0lc01275k.

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We demonstrate pressure-driven microfluidic devices based on buckle-delaminated architectures of thin hydrogel films, which exhibit high durability, permeability, and biocompatibility with intricate 3D morphologies.

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Jackson, John, David Plackett, Eric Hsu, Dirk Lange, Robin Evans, and Helen Burt. "The Development of Solvent Cast Films or Electrospun Nanofiber Membranes Made from Blended Poly Vinyl Alcohol Materials with Different Degrees of Hydrolyzation for Optimal Hydrogel Dissolution and Sustained Release of Anti-Infective Silver Salts." Nanomaterials 11, no. 1 (January 3, 2021): 84. http://dx.doi.org/10.3390/nano11010084.

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Introduction: We previously described the manufacture and characterization of hydrogel forming, thin film, anti-infective wound dressings made from Poly Vinyl Alcohol (PVA) and silver nanoparticles, crosslinked by heat. However, these films were designed to be inexpensive for simple manufacture locally in Africa. In this new study, we have further developed PVA dressings by manufacturing films or electrospun membranes, made from blends of PVA with different degrees of hydrolyzation, that contain silver salts and degrade in a controlled manner to release silver in a sustained manner over 12 days. Methods: Films were solvent cast as films or electrospun into nanofibre membranes using blends of 99 and 88% hydrolyzed PVA, containing 1% w/w silver sulphadiazine, carbonate, sulphate, or acetate salts. Dissolution was measured as weight loss in water and silver release was measured using inductively coupled plasma (ICP) analysis. Results: Cast films generally stayed intact at PVA 99: PVA 88% ratios greater than 40:60 whereas electrospun membranes needed ratios greater than 10:90. Films (40:60 blend ratio) and membranes (10:90) all released silver salts in a sustained fashion but incompletely and to different extents. Electrospun membranes gave more linear release patterns in the 2–12 day period and all salts released well. Conclusion: Blended PVA cast films offer improved control over hydrogel dissolution and silver release without the need for high temperature crosslinking. Blended PVA electrospun membranes further improve membrane dissolution control and silver release profiles. These blended PVA films and membranes offer improved inexpensive systems for the manufacture of long lasting anti-infective hydrogel wound dressings.

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Maher, Shaimaa, Haitham Kalil, and Mekki Bayachou. "Alginate/Polyethyleneimine-Based Nitric Oxide-Releasing Hydrogel As a Potential Platform to Study the Effects of NO on Carcinogenesis." ECS Meeting Abstracts MA2022-01, no. 55 (July 7, 2022): 2318. http://dx.doi.org/10.1149/ma2022-01552318mtgabs.

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Numerous biological functions are affected by the functions of nitric oxide (NO), such as cell proliferation and programmed cell death. NOis a ubiquitous free radical gas that exerts a wide range of biological effects and acts as a signaling molecule in the body. Recent studies have indicated that nitric oxide regulates multiple cancer-related processes, such as angiogenesis, apoptosis, cell cycle, invasion, and metastasis. Alternatively, it is also emerging as a potential anti-oncogenic agent under other conditions. Nitric oxide is synthesized by a complex family of nitric oxide synthase (NOS) enzymes. There is encouraging interest in developing NO-releasing materials as potent tumoricidal agents in which high and localized concentrations of NO may be directly released in a sustained manner to the tumor site. The goal of this project is to develop a hydrogel that incorporates inducible nitric oxide synthase (iNOS) using a layer-by-layer building strategy to form layers of polyethyleneimine (PEI) and iNOSoxy as NO-releasing coatings on alginate hydrogel. When the hydrogel coated with PEI/iNOSoxy films are exposed to arginine, a source of reducing equivalents, and other required ingredients, nitric oxide is formed and released. In this work, FTIR spectroscopy was employed to characterize the functional groups of pristine sodium alginate (SA), polyethyleneimine (PEI) and SA/PEI composite hydrogels. We also used scanning electron microscopy (SEM) for surface characterization. Cyclic voltammetry was used to determine the amount of electroactive heme-enzyme adsorbed on the modified surfaces. We examine how the electroactive heme enzyme in the thin films correlates with the enzymatic NOS activity in terms of NO release fluxes from PEI/NOS-coated hydrogels. After the structural characterization of the NOS/hydrogel films using spectroscopy, we examined their function in terms of NO release profiles. We observed an initial “burst” of NO release during the first 4 hours of activity, followed by a decline and then stable NO release for up to 144 hours possibility to interrogate the role of NO on the balance of cell proliferation and cell death in these cell lines. The measured fluxes are higher than what have been reported in the literature for other inorganic NO-releasing systems. This data will allow us to build NOS-alginate hydrogels with defined NO release profiles for application in cell biology to test the effect of sustained NO release on cell proliferation and cell death on specific cancer cell lines.

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Baran, Nataliia, Oleksandr Grytsenko, Ludmila Dulebova, and Emil Spiśak. "Features of the Formation of a Reinforcing Coating on Hydrogel Membranes Based on Polyvinylpyrrolidone Copolymers." Applied Sciences 14, no. 8 (April 11, 2024): 3234. http://dx.doi.org/10.3390/app14083234.

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This paper presents the study results of formation features of composite hydrogel/polyamide membranes obtained by modification of hydrogel films based on 2-hydroxyethylmethacrylate (HEMA) and polyvinylpyrrolidone (PVP) copolymers. The formation process of composite two-layer membranes was carried out in two stages: obtaining hydrogel membrane substrates followed by their modification with an ultra-thin layer based on a mixture of polyamide (PA) with PVP. The main task of the work was to investigate the possibility of forming a modifying PA/PVP coating on the surface of hydrogel films and to obtain composite hydrogel membranes with the required strength and osmotic permeability based on them. For the formation of composite two-layer membranes, PVP with MM = 12 × 103 g/mol and MM = 360 × 103 g/mol were used. Additional use of PVP in the modifying solution contributes to the process of its penetration into the hydrogel substrate. Together with the formation of a reinforcing layer, this ensures the obtainment of hydrogel films of increased strength, with the possibility of directional regulation of their diffusion permeability. It was found that the main factors affecting the nature of the interaction between the layers of the obtained composite films, as well as their physico-mechanical and sorption–diffusion properties, are the HEMA:PVP ratio in the original polymer–monomer composition (PMC), the formulation of the reinforcing layer, the duration of the modification process and the molecular weight of PVP in PMC and in the modifying solution. The strength and water content of two-layer composite hydrogel/polyamide membranes, as well as their salt and water permeability coefficients, are the highest in the case of using high-molecular weight PVP (MMPVP = 360 × 103 g/mol) and low-molecular weight (MMPVP = 12 × 103 g/mol) during the synthesis of the hydrogel substrate to obtain a PA-6/PVP solution for forming a reinforcing layer.

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Windisch, M., K. J. Eichhorn, J. Lienig, G. Gerlach, and L. Schulze. "Paradigm change in hydrogel sensor manufacturing: from recipe-driven to specification-driven process optimization." Journal of Sensors and Sensor Systems 5, no. 1 (February 10, 2016): 39–53. http://dx.doi.org/10.5194/jsss-5-39-2016.

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Abstract. The volume production of industrial hydrogel sensors lacks a quality-assuring manufacturing technique for thin polymer films with reproducible properties. Overcoming this problem requires a paradigm change from the current recipe-driven manufacturing process to a specification-driven one. This requires techniques to measure quality-determining hydrogel film properties as well as tools and methods for the control and optimization of the manufacturing process. In this paper we present an approach that comprehensively addresses these issues. The influence of process parameters on the hydrogel film properties and the resulting sensor characteristics have been assessed by means of batch manufacturing tests and the application of several measurement techniques. Based on these investigations, we present novel methods and a tool for the optimization of the cross-linking process step, with the latter being crucial for the sensor sensitivity. Our approach is applicable to various sensor designs with different hydrogels. It has been successfully tested with a sensor solution for surface technology based on PVA/PAA hydrogel as sensing layer and a piezoelectric thickness shear resonator as transducer. Finally, unresolved issues regarding the measurement of hydrogel film parameters are outlined for future research.

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Andrieux, Sébastien, Mayur Patil, Leandro Jacomine, Aurélie Hourlier‐Fargette, Sascha Heitkam, and Wiebke Drenckhan. "Investigating Pore‐Opening of Hydrogel Foams at the Scale of Freestanding Thin Films." Macromolecular Rapid Communications 43, no. 17 (September 2022): 2270051. http://dx.doi.org/10.1002/marc.202270051.

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