The interactions of ionic dye permeants with poly(vinyl alcohol) membranes

Costich, P. M.; Osterhoudt, H. W.

doi:10.1002/app.1974.070180318

Cited by 4 publications

(3 citation statements)

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“…These data show that is influenced by the presence of tartrazine, meaning that the is not an independent parameter. Nonetheless, as previously stated, tartrazine does not interact with PVA 56 or the gel matrix. Therefore, is related to Alexa Fluor molecules effective path length, 50 i.e., to the nanoscale tortuosity, and provides detailed information of each gel cleaning mechanism.…”

Section: Resultssupporting

confidence: 67%

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Sponge-like Cryogels from Liquid–Liquid Phase Separation: Structure, Porosity, and Diffusional Gel Properties

Mastrangelo

Resta

Carretti

et al. 2023

ACS Appl. Mater. Interfaces

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Macroporous gels find application in several scientific fields, ranging from art restoration to wastewater filtration or cell entrapment. In this work, two-component sponge-like cryogels are challenged to assess their cleaning performances and to investigate how pores size and connectivity affect physico-chemical properties. The gels were obtained through a freeze−thaw process, exploiting a spontaneous polymer−polymer phase-separation occurring in the pre-gel solution. During the freezing step, a highly hydrolyzed polyvinyl alcohol (H-PVA) forms the hydrogel walls. The secondary components, namely a partially hydrolyzed polyvinyl alcohol (L-PVA) or polyvinyl pyrrolidone (PVP), act as modular porogens, being partially extracted during gel washing. H-PVA/L-PVA and H-PVA/PVP mixtures were studied by confocal laser scanning microscopy to unveil sols and gels morphology at the micron-scale, while small angle X-ray scattering was used to get insights about characteristic dimensions at the nanoscale. The gelation mechanism was investigated through rheology measurements, and the characteristic exponents were compared to De Gennes' scaling laws gathered from percolation. In the field of art conservation, these sponge-like gels are ideal systems for the cleaning of artistic painted surfaces. Their interconnected pores allow the diffusion of cleaning fluids at the painted interface, facilitating dirt uptake and/or detachment. This study uncovered a direct relationship linking a gel's cleaning performance to its apparent tortuosity. These findings can pave the way to fine-tuning systems with enhanced cleaning abilities, not restricted to the restoration of irreplaceable priceless works of art, but with possible application in diverse research fields.

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Section: Resultssupporting

confidence: 67%

“…We evaluated dye uptake from a solid support and gels permeability to a tartrazine aqueous solution. It is worth to mention that tartrazine does not interact with PVA 56 or with the gels matrix.…”

Section: Resultsmentioning

confidence: 99%

Sponge-like Cryogels from Liquid–Liquid Phase Separation: Structure, Porosity, and Diffusional Gel Properties

Mastrangelo

Resta

Carretti

et al. 2023

ACS Appl. Mater. Interfaces

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“…It is well-known fact that PVA is not a native polymer; it is obtained by hydrolysis of poly(vinyl acetate), a reaction difficult to carry out to complete conversion. Two consequences arise therefrom: carboxylic groups usually terminate both ends of the linear polymer chain [8], and a significant proportion of the vinyl acetate moieties may not be hydrolysed to vinyl alcohol. Whenever any elementary step of a recording mechanism is pH-dependent, a marked influence of chain length on the patterning process can be observed.…”

Section: DLmentioning

confidence: 99%

Photopatterning of Dry Polymer Films: on the Relative Involvement of Diffusive and Capillary Convection in the Self-Corrugation Process

Lougnot

Turck

2002

HCA

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Dedicated to Professor Andre¬ M. Braun on the occasion of his 60th birthday Dry poly(vinyl alcohol) (PVA) formulations are widely used in the field of micro-optics for holographic recording and fabrication of micro-optical elements, but very little is known about the recording mechanism and even less in systems generating relief elements through a self-developing process. Thus, the recording of relief gratings with pitches ranging from 5 to 120 l/mm was examined with reference to the average weight of PVA and degree of hydrolysis. The slit width to pitch ratio in the amplitude mask used for photopatterning appeared to be also a controlling factor in the response of sensitive materials. A semiquantitative model was introduced to account for the final shape of the photogenerated relief. It determined the respective parts played by diffusion and capillary convection, i.e., convection processes resulting from gradients of chemical potential and surface tension, respectively, and identified the experimental key parameters governing their interrelation. This work sheds new light on the optimization of the patterning conditions of amplitude masks and is expected to open up new vistas in the replication of computer-generated holograms.

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“Twin Chain” PVA Cryogels with Controlled Tortuosity as Advanced Materials for Cleaning of Works of Art

Mastrangelo,

Bandelli,

Pensabene Buemi

et al. 2024

Adv Funct Materials

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Soft matrices with tuned properties are part of the vast landscape of innovative materials for the restoration of works of art. “Twin chain” polymer networks (TC‐PNs) based on polyvinyl alcohol have proven unique as scaffolds for Cultural Heritage cleaning. They enable optimum adaptability, adhesion, porosity, and connectivity at both micro‐ and nano‐scale resulting in superior time/space‐controlled cleaning operations. In this work, TC‐PNs properties are tuned through a mild crosslinking of the poly(vinyl alcohol) (PVA)‐porogen polymer by using sebacic, adipic, or succinic acid. The modified porogens have different structural features imparting a different phase behavior to TC‐PVAs mixtures in aqueous solution, i.e., in pre‐gel systems used to form gels through a liquid–liquid phase separation. The macro‐, micro‐, and nanoscale features of the final gels are characterized by Confocal Laser Scanning Microscopy, Small Angle X‐ray Scattering, Rheology and are related to their cleaning performances. The study shows that the gels cleaning capacity is related to their tortuosity, that can be tailored at the nanoscale. Counterintuitively gels with higher tortuosity show better performances as evidenced by the cleaning of mockups and paintings from Jean Helion, Jackson Pollock, and Tancredi Parmeggiani at Peggy Guggenheim Collection in Venice.

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The interactions of ionic dye permeants with poly(vinyl alcohol) membranes

Cited by 4 publications

References 0 publications

Sponge-like Cryogels from Liquid–Liquid Phase Separation: Structure, Porosity, and Diffusional Gel Properties

Sponge-like Cryogels from Liquid–Liquid Phase Separation: Structure, Porosity, and Diffusional Gel Properties

Photopatterning of Dry Polymer Films: on the Relative Involvement of Diffusive and Capillary Convection in the Self-Corrugation Process

“Twin Chain” PVA Cryogels with Controlled Tortuosity as Advanced Materials for Cleaning of Works of Art

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