Adjustable wetting of Liquid Flame Spray (LFS) TiO2-nanoparticle coated board: Batch-type versus roll-to-roll stimulation methods

2014 ◽  
Vol 29 (2) ◽  
pp. 271-279 ◽  
Author(s):  
Mikko Tuominen ◽  
Hannu Teisala ◽  
Janne Haapanen ◽  
Mikko Aromaa ◽  
Jyrki M. Mäkelä ◽  
...  
Keyword(s):  
Argon Plasma ◽  
Ultra Violet ◽  
High Volume ◽  
Point Of View ◽  
Flame Spray ◽  
Ambient Conditions ◽  
Batch Type ◽  
Roll To Roll ◽  
Long Time ◽  
Liquid Flame Spray

Abstract Superhydrophobic nanoparticle coating was created on the surface of board using liquid flame spray (LFS). The LFS coating was carried out continuously in ambient conditions without any additional hydrophobization steps. The contact angle of water (CAW) of ZrO2, Al2O3 and TiO2 coating was adjusted reversibly from >150° down to ~10−20° using different stimulation methods. From industrial point of view, the controlled surface wetting has been in focus for a long time because it defines the liquid-solid contact area, and furthermore can enhance the mechanical and chemical bonding on the interface between the liquid and the solid. The used stimulation methods included batch-type methods: artificial daylight illumination and heat treatment and roll-to-roll methods: corona, argon plasma, IR (infra red)- and UV (ultra violet)-treatments. On the contrary to batch-type methods, the adjustment and switching of wetting was done only in seconds or fraction of seconds using roll-to-roll stimulation methods. This is significant in the converting processes of board since they are usually continuous, high volume operations. In addition, the creation of microfluidic patterns on the surface of TiO2 coated board using simple photomasking and surface stimulation was demonstrated. This provides new advantages and possibilities, especially in the field of intelligent printing. Limited durability and poor repellency against low surface tension liquids are presently the main limitations of LFS coatings.

Roll-to-Roll Coating by Liquid Flame Spray Nanoparticle Deposition

2015 ◽  
Vol 1747 ◽  
Author(s):  
Jyrki M. Mäkelä ◽  
Janne Haapanen ◽  
Mikko Aromaa ◽  
Hannu Teisala ◽  
Mikko Tuominen ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Functional Properties ◽  
Flame Spray ◽  
Solution Synthesis ◽  
Large Area ◽  
Silicon Dioxide Nanoparticles ◽  
Nanoparticle Deposition ◽  
Roll To Roll ◽  
High Production Rate ◽  
Liquid Flame Spray

ABSTRACTNanostructured coatings have been prepared on a flexible, moving paperboard using deposition of ca. 10-50-nm-sized titanium dioxide and silicon dioxide nanoparticles generated by a liquid flame spray process, directly above the paperboard, to achieve improved functional properties for the material. With moderately high production rate (∼ g/min), the method is applicable for thin aerosol coating of large area surfaces. LFS-made nanocoating can be synthesized e.g. on paper, board or polymer film in roll-to-roll process. The degree of particle agglomeration is governed by both physicochemical properties of the particle material and residence time in aerosol phase prior to deposition. By adjusting the speed of the substrate, even heat sensitive materials can be coated. In this study, nanoparticles were deposited directly on a moving paperboard with line speeds 50-300 m/min. Functional properties of the nanocoating can be varied by changing nanoparticle material; e.g. TiO2and SiO2are used for changing the surface wetting properties. If the liquid precursors are dissolved in one solution, synthesis of multi component nanoparticle coatings is possible in a one phase process. Here, we present analysis of the properties of LFS-fabricated nanocoatings on paperboard. The thermophoretic flux of nanoparticles is estimated to be very high from the hot flame onto the cold substrate. A highly hydrophobic coating was obtained by a mass loading in the order of 50–100 mg/m2of titanium dioxide on the paperboard.

Paperboard as a substrate for biocompatible slippery liquid-infused porous surfaces

2020 ◽  
Vol 35 (3) ◽  
pp. 479-489
Author(s):  
Mariia Mikriukova ◽  
Johanna Lahti ◽  
Janne Haapanen ◽  
Jyrki M. Mäkelä ◽  
Jurkka Kuusipalo
Keyword(s):  
Large Scale ◽  
Paper Industry ◽  
Necessary Condition ◽  
Flame Spray ◽  
Roll To Roll ◽  
Spray Method ◽  
Porous Surfaces ◽  
Optimization Parameters ◽  
Capillary Movement ◽  
Liquid Flame Spray

AbstractSlippery liquid-infused porous surfaces or SLIPS were first introduced in 2011 by Wong et al. who reported a bioinspired self-repairing surface with remarkable slippery properties. Generally, production of these surfaces includes fossil-based or expensive materials and processes that are available mainly in laboratory scale. In this study, slippery surfaces with sliding angles of less than 10° are obtained using fibre-based material – paperboard – that is commercially available in large-scale and also cheap compared to substrates generally used in this field. The hierarchical nanostructure that is a necessary condition for appropriate droplet mobility was obtained by the liquid flame spray method. This method is fast, scalable, has a variety of optimization parameters and can be utilized in roll-to-roll technology that is traditional in paper industry. In this work, paperboard serves not only as a substrate, but also as a reservoir for the lubricant, thus it is important to evaluate the affinity of the material for the oils and estimate the capillary movement. Therefore, Cobb and Klemm methods were used when choosing a paperboard material. In addition to synthetic oils, rapeseed oil was also utilized as a lubricant, which potentially leads to eco-friendly and recyclable slippery liquid-infused porous surfaces.

scholarly journals Nanoparticle Deposition from Liquid Flame Spray onto Moving Roll-to-Roll Paperboard Material

2011 ◽  
Vol 45 (7) ◽  
pp. 827-837 ◽  
Author(s):  
Jyrki M. Mäkelä ◽  
Mikko Aromaa ◽  
Hannu Teisala ◽  
Mikko Tuominen ◽  
Milena Stepien ◽  
...  
Keyword(s):  
Flame Spray ◽  
Nanoparticle Deposition ◽  
Roll To Roll ◽  
Liquid Flame Spray

scholarly journals Peering inside a cough or sneeze to explain enhanced airborne transmission under dry weather

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kai Liu ◽  
Majid Allahyari ◽  
Jorge S. Salinas ◽  
Nadim Zgheib ◽  
S. Balachandar
Keyword(s):  
High Fidelity ◽  
Substantial Variation ◽  
Ambient Conditions ◽  
Airborne Transmission ◽  
Social Distancing ◽  
Virtual Experiments ◽  
Long Time ◽  
Simulation Results ◽  
High Fidelity Simulations ◽  
Droplet Nuclei

AbstractHigh-fidelity simulations of coughs and sneezes that serve as virtual experiments are presented, and they offer an unprecedented opportunity to peer into the chaotic evolution of the resulting airborne droplet clouds. While larger droplets quickly fall-out of the cloud, smaller droplets evaporate rapidly. The non-volatiles remain airborne as droplet nuclei for a long time to be transported over long distances. The substantial variation observed between the different realizations has important social distancing implications, since probabilistic outlier-events do occur and may need to be taken into account when assessing the risk of contagion. Contrary to common expectations, we observe dry ambient conditions to increase by more than four times the number of airborne potentially virus-laden nuclei, as a result of reduced droplet fall-out through rapid evaporation. The simulation results are used to validate and calibrate a comprehensive multiphase theory, which is then used to predict the spread of airborne nuclei under a wide variety of ambient conditions.

Preparation of Alternative Hydraulic Binder Based on Secondary Raw Materials

2014 ◽  
Vol 1000 ◽  
pp. 12-15
Author(s):  
Jiří Švec ◽  
Tomáš Opravil ◽  
Jiří Másilko
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Construction Materials ◽  
High Volume ◽  
Point Of View ◽  
Hydraulic Lime ◽  
Combustion Gases ◽  
Secondary Raw Materials ◽  
Hydraulic Binder ◽  
Massive Scale

Reusing and recycling of secondary raw materials from high-volume industrial productions (especially form construction materials and binders fabrications) is very important way of conserving environment and it is also interesting from the economical point of view. The production of common hydraulic binders, especially Portland cement, burdens the environment with considerable amount of combustion gases and consumes energy in massive scale. Alternative (low – energy) binder can be used as Portland cement substitution in applications with lower mechanical properties requirements. Mined limestone wash sediments contain large amount of clay components, but there is also indispensable share of fine calcite. This composition makes these sediments a promising material for the preparation of hydraulic binders as Roman cement or hydraulic lime.

Controlled Release of Active Substance from Biodegradable Copolymer Matrix

2006 ◽  
Vol 510-511 ◽  
pp. 798-801
Author(s):  
Hyung Suk So ◽  
Hyun Chul Shin ◽  
Beom Suk Kim ◽  
Yeong Seok Yoo
Keyword(s):  
Methylene Blue ◽  
Active Substance ◽  
Phosphate Buffer Solution ◽  
Ultra Violet ◽  
Hydroxyl Groups ◽  
Buffer Solution ◽  
Solution Ph ◽  
Effective Discharge ◽  
Constant Rate ◽  
Long Time

The purpose of this study is to develop a new system to control effective discharge of active substances such as agricultural chemicals. To synthesize a naturally dissolvable polymer; ε-caprolactone and diglycolide were copolymerized with ethylene glycol as an initiator to produce macrodiol. As macrodiol has hydroxyl groups in both ends, they are modified with methacryloyl chloride for photochemical networking. After standard macromonomer produced by this procedure was physically mixed with methylene blue, it was networked with ultra-violet rays to be filmed. This film is naturally dissolvable and hydrolytic. As a result of hydrolytic test with a crosslinked structure of 10 % methylene blue, it decreased by 9 % for seven weeks in 37 °C phosphate buffer solution (pH = 7). Thus, we verified that active substance can be discharged from a crosslinked structure for a long time at a constant rate under room temperature.

Bona fides and ubuntu – A response to Dale Hutchison

Acta Juridica ◽  
2021 ◽  
Vol 2021 ◽  
pp. 85-106
Author(s):  
J Barnard-Naudé
Keyword(s):  
South African ◽  
Common Law ◽  
Standard Form ◽  
Contract Law ◽  
Law School ◽  
Point Of View ◽  
Long Time ◽  
School Faculty ◽  
The Common ◽  
Faculty Meeting

This paper is a response to Dale Hutchison’s recent arguments about the role of fairness in contract law after the Constitution. From the point of view of transformative constitutionalism, the paper argues that the fairness ‘debate’ in the South African law of contract should be approached as what it so patently is, namely, as evidence of a deep ideological conflict that has existed in our law of contract for a very long time, and that this debate now exists within the context of a larger debate about the appropriate transformative reach of the Constitution. The argument takes the form of two ‘dangerous supplements’ to Hutchison’s discourse. The first of these supplements contends that indeterminacy is a symptom of the common law itself, rather than a result of contract law’s contact with the Constitution. The second dangerous supplement suggests a responsible judicial engagement with bona fides and ubuntu, one that can exploit the strengths of both the common law and the Constitution and that understands good faith and ubuntu to be ‘inter-linking’ constitutional values that should be enlisted in unison or at least in resonance when it comes to the question of fairness in our contemporary law of contract. In conclusion, I offer a reading of Hutchison’s own politics of contract law and contend that his is an altruistic politics committed to the standard form. I contend that this politics of contract law is consistent with a transformative understanding of the post-apartheid legal order. ‘Law, like every other cultural institution, is a place where we tell one another stories about our relationships with ourselves, one another, and authority. In this, law is no different from the Boston Globe, the CBS evening news, Mother Jones, or a law school faculty meeting. When we tell one another stories, we use languages and themes that different pieces of the culture make available to us, and that limit the stories we can tell. Since our stories influence how we imagine, as well as how we describe, our relationships, our stories also limit who we can be’.

Nanoparticle Deposition on Packaging Materials by Liquid Flame Spray

2013 ◽  
pp. 331-344 ◽  
Author(s):  
Hannu Teisala ◽  
Mikko Tuominen ◽  
Mikko Aromaa ◽  
Milena Stepien ◽  
Jyrki Mäkelä ◽  
...  
Keyword(s):  
Packaging Materials ◽  
Flame Spray ◽  
Nanoparticle Deposition ◽  
Liquid Flame Spray

scholarly journals Representação e ciências sociais

2016 ◽  
Vol 1 (1) ◽  
pp. 109-126
Author(s):  
Drance Elias da Silva
Keyword(s):  
Social Sciences ◽  
Knowledge Representation ◽  
Human Life ◽  
Point Of View ◽  
General View ◽  
Dominant Culture ◽  
The Real ◽  
The Social ◽  
Long Time ◽  
Expression Form

This Article may be situated within the rapport field between Philosophy and Social Sciences, at the search regarding to the concept concerning the Representation. Regarding to Philosophy, under a general view, the concept, concerning Representation, has been, since a long time, understood as a trail which one would get througl reaching to the real and true ones. Representation, as the thought contents expression form had not been known departing from Philosophy as a barrier against the objectivity concerning the knowledge. Representation, in its source, has been constituting itself a cognictive, inmanent reflection, related to the conscience inner subjectivity. But departing from the episthemological point of view, it has been not so easy for the campus concerning the Culture Sciences as a totality. In the theory regarding to knowledge, the Social Sciences campus and, more specifically, in the human life Symbolic dimension constitutive aspects, it has been, often, accepted negatively as an entry door for the histotical social reality. Nowadays, one may conclude that the contents concerning the Culture are deeply rooted within the histotical reality, which may present new dimension the reading regarding to the Symbolical side concerning the human life, under the view regarding to the unseen aspect, such as the intellectualistic Western dominant Culture allows understanding the way which could be in.

scholarly journals “Mother of the Faithful” and “Lion of Allah” in the Prophetic Tradition and Early History of the Caliphate or Why the Islamic Jama at Disintegrated?

2020 ◽  
Vol 16 (2) ◽  
pp. 47-56
Author(s):  
F. A. Asadullin
Keyword(s):  
Point Of View ◽  
Islamic Period ◽  
Islamic Schools ◽  
Regional Conflicts ◽  
Long Time ◽  
History Of ◽  
The Russian Federation ◽  
The One ◽  
Early Islamic Period ◽  
Early Islamic

The problem of disintegration of the Islamic Ummah a long time ago became the one of the most important for the Islamic world and worldview. The wave of violence in the Near and Middle East sharpened some regional conflicts, which have already taken place before. The paper deals with the roots of this conflict atmosphere in the Early Islamic period. As the tradition affirms, the Prophet Muhammad predicted the Ummah to split in 73 sects. Today there exist in any case not less than 73 different Islamic schools, movements and organizations, which mutually and constantly contest their doctrinal authenticity. Moreover, the activity of quasi- Islamic extremist organisations like the ISIS, which is forbidden inside as well as outside the Russian Federation, is quite remarkable. All these factors demonstrate, that from the academic point of view it is actual to critically research the nature of fragmentation and disintegration of Islamic communities through the prism of prophetic legends. This paper is to consider as an attempt to resolve this multidimensional problem.

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