Multiple crack nucleation in drying nanoparticle-polymer coatings

Yamamura, Masato; Ono, Hiromi; Uchinomiya, Tetsuro; Mawatari, Yoshihide; Kage, Hiroyuki

doi:10.1016/j.colsurfa.2009.04.008

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…To this end we are aware that there is an enormous amount of work which has been performed in relation to trying to solve the ‘cracking problem for colloidal photonic crystals 95. These methods are generic and hence not specific to the LB approach, but include approaches such as substrate templating,96 control of rate of evaporation,97 control of drying humidity,98 addition of fillers between the spheres etc 99–101. There have been numerous papers published on this topic 102–114…”

Section: Discussionmentioning

confidence: 99%

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

Bardosova¹,

Pemble²,

Povey³

et al. 2010

Advanced Materials

172

118

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The area of colloidal photonic crystal research has attracted enormous attention in recent years as a result of the potential of such materials to provide the means of fabricating new or improved photonic devices. As an area where chemistry still predominates over engineering the field is still in its infancy in terms of finding real applications being limited by ease of fabrication, reproducibility and 'quality'- for example the extent to which ordered structures may be prepared over large areas. It is our contention that the Langmuir-Blodgett assembly method when applied to colloidal particles of silica and perhaps other materials, offers a way of overcoming these issues. To this end the assembly of silica and other particles into colloidal photonic crystals using the Langmuir-Blodgett (LB) method is described and some of the numerous papers on this topic, which have been published, are reviewed. It is shown that the layer-by-layer control of photonic crystal growth afforded by the LB method allows for the fabrication of a range of novel, layered photonic crystals that may not be easily assembled using any other approach. Some of the more interesting of these structures, including so-called heterostructured photonic crystals comprising of layers of spheres having different diameters are presented and their optical properties described. Finally, we offer our comments as to future applications of this interesting technology.

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Section: Discussionmentioning

confidence: 99%

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

Bardosova¹,

Pemble²,

Povey³

et al. 2010

Advanced Materials

172

118

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“…While the effect of polymer adsorption on dispersion stability has been intensively studied as one of the main subjects in the field of colloidal science and technology [8][9][10], its effect on drying behavior or on the final property of a film is still less understood. There exist a few literatures on the drying behavior of particle/polymer suspensions; crack analysis [11,12] and stress measurement of drying film [13,14], however systematic study on the effect of polymer adsorption on the drying behavior of particle/polymer suspensions has rarely been performed. This information will be critical to obtaining the products with uniform distribution of particles [15], which is highly desired in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Adsorption–stress relationship in drying of silica/PVA suspensions

Kim

Sung

Chun

et al. 2011

Journal of Colloid and Interface Science

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“…Instead, the crack formation may be generated by the nucleation of new cracks, for which the crack spacing does not only depend on lm thickness, but also on drying rate and initial defect concentration. [47][48][49][50] This quantitative deviation between the data and the results predicted by eqn (2) indicates that the elastic fracturing model is too simplistic to adequately capture the behavior of the (organo)silica thin lms in a broad range of regimes. Thus, a new, unied theory is required to explain these different data for diverse systems.…”

Section: Crack Spacingmentioning

confidence: 90%

Formation and prevention of fractures in sol–gel-derived thin films

et al. 2015

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Sol-gel-derived thin films play an important role as the functional coatings for various applications that require crack-free films to fully function. However, the fast drying process of a standard sol-gel coating often induces mechanical stresses, which may fracture the thin films. An experimental study on the crack formation in sol-gel-derived silica and organosilica ultrathin (submicron) films is presented. The relationships among the crack density, inter-crack spacing, and film thickness were investigated by combining direct micrograph analysis with spectroscopic ellipsometry. It is found that silica thin films are more prone to fracturing than organosilica films and have a critical film thickness of 300 nm, above which the film fractures. In contrast, the organosilica films can be formed without cracks in the experimentally explored regime of film thickness up to at least 1250 nm. These results confirm that ultrathin organosilica coatings are a robust silica substitute for a wide range of applications.

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Multiple crack nucleation in drying nanoparticle-polymer coatings

Cited by 19 publications

References 16 publications

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

Adsorption–stress relationship in drying of silica/PVA suspensions

Formation and prevention of fractures in sol–gel-derived thin films

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