Controlled exponential growth in layer-by-layer multilayers using high gravity fields

Jiang, Chao; Liu, Xiaolin; Luo, Caijun; Zhang, Yajun; Shao, Lei; Shi, Feng

doi:10.1039/c4ta02437k

Cited by 24 publications

(28 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, polymer combinations that grow exponentially using immersive assembly also grow linearly using this technology. Similarly, the roughness is much lower (~2-to 10-fold) for LbL films assembled in this way (49).…”

Section: Research | Reviewmentioning

confidence: 86%

Technology-driven layer-by-layer assembly of nanofilms

Richardson

Björnmalm

Caruso

2015

Science

1,393

971

View full text Add to dashboard Cite

Multilayer thin films have garnered intense scientific interest due to their potential application in diverse fields such as catalysis, optics, energy, membranes, and biomedicine. Here we review the current technologies for multilayer thin-film deposition using layer-by-layer assembly, and we discuss the different properties and applications arising from the technologies. We highlight five distinct routes of assembly—immersive, spin, spray, electromagnetic, and fluidic assembly—each of which offers material and processing advantages for assembling layer-by-layer films. Each technology encompasses numerous innovations for automating and improving layering, which is important for research and industrial applications. Furthermore, we discuss how judicious choice of the assembly technology enables the engineering of thin films with tailor-made physicochemical properties, such as distinct-layer stratification, controlled roughness, and highly ordered packing.

show abstract

Section: Research | Reviewmentioning

confidence: 86%

Technology-driven layer-by-layer assembly of nanofilms

Richardson

Björnmalm

Caruso

2015

Science

1,393

971

View full text Add to dashboard Cite

show abstract

“…This higher roughness leads to increases in surface area, resulting in the increased deposition of incoming polymers. This model is supported by the finding that multilayers that grow exponentially through dip-coating may be turned into linearly growing layers through spin coating, as was reported for hydrogen bonded (poly(ethylene glycol) (PEG)# poly(acrylic acid) (PAAc)) multilayers [16], and more recently for (PAH#PAAc) through application of high gravity fields [86], two deposition techniques that reduce potential surface roughness.…”

Section: Chapter 2 23 Lbl Fabrication-specific Responsivenesssupporting

confidence: 58%

Multilayered thin films from poly(amido amine)s for controlled delivery

Hujaya¹

View full text Add to dashboard Cite

“…2c) to that fabricated by the dipping method. 30 To confirm the shear effects of the high gravity field on the multilayer, we increased the rotating speed to 2400 rpm min À1 and 3000 rpm min À1 to check the surface morphology. From the local Scheme 2 Mechanism of the acceleration of mass transfer under a high gravity field.…”

Section: Resultsmentioning

confidence: 99%

“…[5][6][7][8] Therefore, it is a general challenge to enhance the interfacial diffusion/infiltration through thin films while maintaining the original film properties or functions such as adsorption behavior, 7 binding affinity, 24 separating efficiency, 26 and so on. 28,30,31 The high gravity equipment provides a mechanical-force-field with strong shear stress and rapidly renewable interfaces, which produce a highly turbulent flow to reduce fluidic resistance and accelerate the mass transfer rate. One is to increase the driving force for adsorption of species from the bulk solution to the surface, i.e.…”

Section: Introductionmentioning

confidence: 99%

Introducing a high gravity field to enhance infiltration of small molecules into polyelectrolyte multilayers

et al. 2015

Self Cite

View full text Add to dashboard Cite

Loading functional small molecules into nano-thin films is fundamental to various research fields such as membrane separation, molecular imprinting, interfacial reaction, drug delivery etc. Currently, a general demand for enhancing the loading rate without affecting the film structures exists in most infiltration phenomena. To handle this issue, we have introduced a process intensification method of a high gravity technique, which is a versatile energy form of mechanical field well-established in industry, into the investigations on diffusion/infiltration at the molecular level. By taking a polyelectrolyte multilayer as a model thin film and a photo-reactive molecule, 4,4'-diazostilbene-2,2'-disulfonic acid disodium salt (DAS), as a model small functional molecule, we have demonstrated remarkably accelerated adsorption/infiltration of DAS into a poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA) multilayer by as high as 20-fold; meanwhile, both the film property of the multilayer and photoresponsive-crosslinking function of DAS were not disturbed. Furthermore, the infiltration of DAS and the surface morphology of the multilayer could be tuned based on their high dependence on the intensity of the high gravity field regarding different rotating speeds. The mechanism of the accelerated adsorption/infiltration under the high gravity field was interpreted by the increased turbulence of the diffusing layer with the thinned laminar boundary layer and the stepwise delivery of the local concentration gradient from the solution to the interior of the multilayer. The introduction of mechanical field provides a simple and versatile strategy to address the paradox of the contradictory loading amount and loading rate, and thus to promote applications of various membrane processes.

show abstract

Controlled exponential growth in layer-by-layer multilayers using high gravity fields

Cited by 24 publications

References 35 publications

Technology-driven layer-by-layer assembly of nanofilms

Technology-driven layer-by-layer assembly of nanofilms

Multilayered thin films from poly(amido amine)s for controlled delivery

Introducing a high gravity field to enhance infiltration of small molecules into polyelectrolyte multilayers

Contact Info

Product

Resources

About