scholarly journals Film forming PVA-based cleaning systems for the removal of corrosion products from historical bronzes

2018 ◽  
Vol 90 (3) ◽  
pp. 507-522 ◽  
Author(s):  
Erica I. Parisi ◽  
Nicole Bonelli ◽  
Emiliano Carretti ◽  
Rodorico Giorgi ◽  
Gabriel M. Ingo ◽  
...  
Keyword(s):  
Film Formation ◽  
Poly Vinyl Alcohol ◽  
Complexing Agent ◽  
Film Forming ◽  
Innovative System ◽  
Mechanical Procedure ◽  
Cleaning Procedures ◽  
Film Formation Mechanism

AbstractThis paper presents an innovative poly(vinyl)alcohol-based film forming system, specifically devised for the controllable and selective cleaning of copper-based artifacts. Traditional cleaning procedures are commonly performed using mechanical and/or chemical methods. Unfortunately, both these methods present some limitations related to both the poor selectivity and invasiveness in case of the mechanical procedure, and to the scarce control over the involved reactions when dealing with a chemical approach. The innovative system proposed in this work allows combining the advantages of chemical and mechanical treatments thanks to the confinement of a complexing agent (EDTA) within a fluid, polymeric matrix, that is able to form a solid thin film upon drying. After treatment, the polymeric film can be completely removed from the artwork through a gentle peeling action. In this contribution, the film formation mechanism was investigated by means of thermal analysis and rheology; the role of plasticizers, volatile solvent fraction, and quantity of loaded EDTA is also discussed. Finally, the results of cleaning tests performed on artificially aged samples, and on a real case study, the “Fontana dei Mostri Marini” by Pietro Tacca in Florence, are presented.

In situ study of the film formation mechanism of organic–inorganic hybrid perovskite solar cells: controlling the solvate phase using an additive system

2020 ◽  
Vol 8 (16) ◽  
pp. 7695-7703 ◽  
Author(s):  
Sehyun Lee ◽  
Ming-Chung Tang ◽  
Rahim Munir ◽  
Dounya Barrit ◽  
Yeon-Ju Kim ◽  
...  
Keyword(s):  
Spin Coating ◽  
Film Formation ◽  
Perovskite Solar Cells ◽  
In Situ Study ◽  
Hybrid Perovskite ◽  
System P ◽  
Direct Formation ◽  
Film Formation Mechanism

The role of the additive and solvate phases in the direct formation of perovskite crystals was revealed by in situ analysis during spin-coating condition.

scholarly journals Nucleation and crystal growth control for scalable solution-processed organic–inorganic hybrid perovskite solar cells

2020 ◽  
Vol 8 (4) ◽  
pp. 1578-1603 ◽  
Author(s):  
Hanlin Hu ◽  
Mriganka Singh ◽  
Xuejuan Wan ◽  
Jiaoning Tang ◽  
Chih-Wei Chu ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Film Formation ◽  
Perovskite Solar Cells ◽  
Growth Control ◽  
Solution Deposition ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Deposition Techniques ◽  
Film Formation Mechanism

In this review, we provide an in-depth overview of perovskite film formation mechanism and highlight the important role of nucleation/crystal growth in perovskite photovoltaics by using scalable solution deposition techniques.

Analysis of the Color Phosphating Process Influence Factors

2012 ◽  
Vol 581-582 ◽  
pp. 823-826 ◽  
Author(s):  
Ze Min Chen ◽  
Zhi Li Wu ◽  
Qiao Yun Zhang
Keyword(s):  
Corrosion Resistance ◽  
Film Formation ◽  
Orthogonal Experiment ◽  
Influence Factors ◽  
Sodium Molybdate ◽  
Single Factor ◽  
Film Forming ◽  
Depth Analysis ◽  
Factor Variable ◽  
Film Formation Mechanism

For the ratio from orthogonal experiment, the phosphating solution which prepared with zinc oxide, phosphate acid, tartaric acid, sodium molybdate, Ma Jif salt, sodium fluoride, phytic acid, chrome alum to do the single factor variable experiments. For the various factors effect on the corrosion resistance of phosphating film to do the in-depth analysis. Preliminary analyse the film formation mechanism via the scan curve of the potential to the time, and determined the best film-forming time.

The role of multiplicity in a cult: A case study

1987 ◽  
Author(s):  
William A. Worrall ◽  
Ann W. Stockman

Endangered Butterflies and their Non-Native Host Plants: Examining Shifting Values of Belonging in Restoration

2019 ◽  
Vol 3 (1) ◽  
pp. 1-9
Author(s):  
Robert M. Anderson ◽  
Amy M. Lambert
Keyword(s):  
Ecological Restoration ◽  
Native Species ◽  
Puget Sound ◽  
A Value ◽  
The Social ◽  
Remote Island ◽  
Scientific Truth ◽  
Native Host

The island marble butterfly (Euchloe ausonides insulanus), thought to be extinct throughout the 20th century until re-discovered on a single remote island in Puget Sound in 1998, has become the focus of a concerted protection effort to prevent its extinction. However, efforts to “restore” island marble habitat conflict with efforts to “restore” the prairie ecosystem where it lives, because of the butterfly’s use of a non-native “weedy” host plant. Through a case study of the island marble project, we examine the practice of ecological restoration as the enactment of particular norms that define which species are understood to belong in the place being restored. We contextualize this case study within ongoing debates over the value of “native” species, indicative of deep-seated uncertainties and anxieties about the role of human intervention to alter or manage landscapes and ecosystems, in the time commonly described as the “Anthropocene.” We interpret the question of “what plants and animals belong in a particular place?” as not a question of scientific truth, but a value-laden construct of environmental management in practice, and we argue for deeper reflexivity on the part of environmental scientists and managers about the social values that inform ecological restoration.

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