Some recent progress in adhesion technology and science

Cognard, J.

doi:10.1016/j.crci.2004.11.016

Cited by 75 publications

(42 citation statements)

References 33 publications

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“…A cada ano essa tecnologia esta mais introduzida no mundo, permitindo solucionar necessidades de adesão sem o uso de rebites, parafusos e soldaduras (Fruet, 2011;Cognard, 2006).…”

Section: Introductionunclassified

Comparação De Adesivos Estruturais Na Junção De Chapas Metálicas

Bezerra¹,

Fiori²

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Os adesivos estruturais permitem a união de diversos tipos de materiais, sendo uma solução para junção sem o uso de rebites, parafusos ou soldaduras. Neste trabalho foram avaliadas propriedades de adesivos de base acrílica (A), epóxi (E) e uretânica (U) na adesão de chapas metálicas, definindo-se qual obtém melhor compatibilidade e desempenho com o substrato. Foram avaliadas resistências ao cisalhamento (C) e tração axial (T) de juntas expostas à névoa salina e ambiente natural. O teste de névoa salina foi realizado em equipamento Salt Spray, com exposição de 500 horas das amostras suspensas entre 15 e 30° em relação à vertical e paralelas à direção principal do fluxo. As tensões médias (kgf/in 2 ) obtidas foram de 1055 (A), 566 (E) e 976 (U) para C e de 29 (A), 15 (E) e 30 (U) para T em ambiente natural. A exposição à névoa salina diminuiu a resistência em todas as amostras. Com relação ao tipo de falhas, A apresentou falha coesiva (FC) em C e falha de substrato (FS) em T; E teve falha adesiva (FA) em C e T; e U apresentou FA/FC em C e FS em T. Conclui-se que A teve melhor desempenho, sua força de tração foi superior ou semelhante a U, e as falhas foram consideradas ideais.

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“…A cada ano essa tecnologia esta mais introduzida no mundo, permitindo solucionar necessidades de adesão sem o uso de rebites, parafusos e soldaduras (Fruet, 2011;Cognard, 2006).…”

Section: Introductionunclassified

Comparação De Adesivos Estruturais Na Junção De Chapas Metálicas

Bezerra¹,

Fiori²

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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“…A CO 2 bubble was generated by the coalescence of a droplet of 0.4 mol/L NaHCO 3 solution and another droplet of 2.5 mol/L hydrochloric acid (the amount of reagents should be controlled carefully to form only one bubble). The spherical bubble confined inside the droplet could be removed by a syringe needle adhesion between the aqueous liquid and the container walls [9][10][11], the anti-adhesive property of the superhydrophobic pedestals enabled the products from this miniature reactor to be harvested effectively. To demonstrate the collection of a solid product, a typical precipitate-forming metathesis reaction was performed.…”

Section: A Miniature Droplet Reactor Built On Superhydrophobic Pedestalsmentioning

confidence: 99%

“…Notably, droplet-based microfluidic systems, in which reactions are performed by mixing aqueous reagent droplets in oil-filled microchannels, have shown promising applications in enzymatic kinetics, protein crystallization, and other biochemical reactions [8]. Since weak van der Waals forces or stronger hydrogen bonds generally exist when water molecules are close to the molecules/atoms on solid surfaces [9][10][11], problems of adhesion between the aqueous liquid and container walls usually occur in such reactors. As a result, due to the wetting nature of the contact, liquids with reaction products tend to remain at the bottom of containers or micro-channels, which can simultaneously decrease product yield, clog reactors, and result in contamination.…”

Section: Introductionmentioning

confidence: 99%

A miniature droplet reactor built on nanoparticle-derived superhydrophobic pedestals

Wang

Song

et al. 2010

Nano Res.

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The capability to design and modulate materials, shapes, heat transfer, and mass mixing during the process of developing chemical reactors has allowed researchers to explore millions of chemical reactions and assays. However, despite the advantages in engineering array-based microreactors or microfluidic systems, the wetting attachment between solutions of reagents/products and the glass or polymer substrates of containers leads to difficulties in collecting products effectively and preventing channel blockage. Herein we present a miniature droplet reactor which takes advantage of the anti-wetting and low-adhesive properties of nanoparticle-derived superhydrophobic pedestals, allowing aqueous droplets to be manipulated freely but also providing a confined environment for performing a series of aqueous phase chemical reactions on a small scale. Gas-or precipitateforming reactions can also be performed inside this miniature reactor. Most importantly, reaction products in liquid, solid or gaseous states can be collected effectively, which allows the harvesting of valuable products formed in limited amounts. Such a miniature reactor built on superhydrophobic pedestals provides a new way of performing common chemical reactions and may open the door to the design of next-generation microreaction systems.

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“…If the effectiveness of the technique is now widely recognized (Pendari et al 2008, Hamelin 2002, many questions remain regarding durability issues (Karbhari et al 2003). In a more general way, durability aspects are still to be addressed for structural assemblies involving adhesively bonded joints (Cognard 2006).…”

Section: Applications Of Fiber Reinforced Polymer (Frp)mentioning

confidence: 99%