Stable Superhydrophobic Organic−Inorganic Hybrid Films by Electrostatic Self-Assembly

Han, Joong Tark; Zhang, Yanli; Cho, Jeong Ho; Xu, Xurong; Cho, Kilwon

doi:10.1021/jp052691x

Cited by 197 publications

(138 citation statements)

References 46 publications

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“…Ji et al [40] prepared superhydrophobic films using films that grow exponentially with growth that was amplified due to the presence of silver ions. Other strategies rely on organic-inorganic hybrid films, such as PAH and ZrO 2 nanoparticle coatings, [222] in combination with the LbL technique with electrochemical depositing of dendritic gold aggregate coatings on gold threads, [223] or on a polyelectrolyte/sodium silicate combination. [224] In these latter cases, a final fluorination step [223] was usually applied in which a fluoroalkylsilane was deposited.…”

Section: Mimicking the Properties Of Natural Materialsmentioning

confidence: 99%

Multiple Functionalities of Polyelectrolyte Multilayer Films: New Biomedical Applications

Boudou¹,

Crouzier²,

Ren³

et al. 2010

Advanced Materials

695

702

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The design of advanced functional materials with nanometer- and micrometer-scale control over their properties is of considerable interest for both fundamental and applied studies because of the many potential applications for these materials in the fields of biomedical materials, tissue engineering, and regenerative medicine. The layer-by-layer deposition technique introduced in the early 1990s by Decher, Moehwald, and Lvov is a versatile technique, which has attracted an increasing number of researchers in recent years due to its wide range of advantages for biomedical applications: ease of preparation under "mild" conditions compatible with physiological media, capability of incorporating bioactive molecules, extra-cellular matrix components and biopolymers in the films, tunable mechanical properties, and spatio-temporal control over film organization. The last few years have seen a significant increase in reports exploring the possibilities offered by diffusing molecules into films to control their internal structures or design "reservoirs," as well as control their mechanical properties. Such properties, associated with the chemical properties of films, are particularly important for designing biomedical devices that contain bioactive molecules. In this review, we highlight recent work on designing and controlling film properties at the nanometer and micrometer scales with a view to developing new biomaterial coatings, tissue engineered constructs that could mimic in vivo cellular microenvironments, and stem cell "niches."

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Section: Mimicking the Properties Of Natural Materialsmentioning

confidence: 99%

Multiple Functionalities of Polyelectrolyte Multilayer Films: New Biomedical Applications

Boudou¹,

Crouzier²,

Ren³

et al. 2010

Advanced Materials

695

702

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“…Subsequently, these films have been dipped in a solution containing fluoroalkylsilane polymers for 20 min at 70°C to further increase the hydrophobicity of the surface (Supporting Information). [40] The bare and hairy BCM (i.e., PS 10.6k -b-P4VP 42.4k / PS 2k -b-PAA 8k )-coated silica colloidal films without any evident nanostructured roughness display similar water contact angles of about 122°(the difference between the advancing and receding angle, Dh ad-re is about 18°), as shown in Figure 2a. On the other hand, silica colloids coated with 3-bilayered crew-cut BCMs at pH 4/6 show a relatively high water contact angle of 148°(Dh ad-re ∼ 8°) despite the inadequate surface coverage (Fig. 2b).…”

mentioning

confidence: 93%

Tunable Superhydrophobic and Optical Properties of Colloidal Films Coated with Block‐Copolymer‐Micelles/Micelle‐Multilayers

et al. 2007

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Many naturally occurring surfaces such as lotus leaves and butterfly wings exhibit the remarkable self-cleaning effect. The hydrophobicity of these surfaces arises from their hierarchical surface roughness at two different length scales (specifically, at ca. 3-10 lm and about 100 nm length scales). [1][2][3][4][5][6][7][8][9][10][11] Artificial superhydrophobic surfaces have attracted considerable attention owing to their potential applications for fabricating glass covers for solar cells, eye glasses, and waterproof clothes. Much research effort at preparing these synthetic surfaces has focused on film structures exhibiting roughness at two different length scales. For example, superhydrophobic surfaces showing water-droplet contact angles greater than 150°have been prepared from porous multilayer films, [11] binary colloidal assemblies, [12] raspberry-like colloidal films, [13] sodium silicate multilayer-coated colloidal films, [14] 2D nanopillar arrays, [15] and electrochemically deposited gold films.[16]Recently, there have been several attempts to prepare smart and intelligent superhydrophobic films exhibiting responsive optical properties. [17,18] For example, it has been reported that Si nanowire films containing photochromic spiropyran molecules exhibit light-responsive water contact angles because the spiropyran dye is hydrophobic under visible light, whereas UV irradiation converts the dye into its hydrophilic form.[17]Furthermore, Sato and co-workers have reported that the structural color of inverse opal films (arising from light diffraction) modified with fluoroalkylsilanes can be modulated from blue to red by changing the size of the colloidal particles; remarkably, the films can also be simultaneously tuned to exhibit superhydrophobicity with a high water contact angle of about 155°.[18]Charged block copolymer micelles (BCMs) composed of hydrophilic and hydrophobic segments, such as polystyrene-bpoly(acrylic acid) (PS-b-PAA) and polystyrene-b-poly(4-vinyl pyridine) (PS-b-P4VP), have been known to incorporate hydrophobic materials (e.g., gold nanoparticles, [19,20] quantum dots (QDs), [21] magnetic nanoparticles, [22] fluorescent dyes, [23,24] or spiropyran dyes) [25] into the hydrophobic cores of the micelles in water. Recently, it has been reported that charged BCMs containing hydrophobic organic dyes can be self-assembled with BCMs exhibiting a complementary charge onto flat [25] and colloidal substrates [26] using layer-bylayer (LbL) deposition. Specifically, in the case of multilayer films assembled using protonated PS-b-P4VP and anionic PS-b-PAA, because of aggregation between the adsorbed micelles, the size of the micelles is strongly dependent on the charge density of the hydrophilic corona chains, the molecular weight (M w ), and the number of bilayers of BCMs. Accordingly, if the BCM multilayer films are coated onto micrometer-sized colloidal particles on the nanometer scale, upon the further adsorption of fluoroalkylsilane, superhydrophobic surfaces with hierarchical dual-scale roughness ...

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“…Protection of monument by using polymeric coatings was of great intense in a lot of works [20,21,22,23,24,25].…”

Section: Introductionmentioning

confidence: 99%

Protection of Limestone Coated with Different Polymeric Materials

Abdellah¹,

Gelany²,

Mohamed³

et al. 2017

AJME

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The uniaxial compressive strength is an important parameter in selecting and design of rock and brittles structure. Protection of ancient monuments or historic structure has a great intense in material science point of view. Limestone is commonly rock material which has a great sense in historical buildings and temples. The strength of this material may be influenced by natural weathering like moisture, rains and varying temperature. Samples of ancient limestone rock are coated with Paraloid B44, Paraloid B72, ethyl silicate and Wacker OH100. The results concluded that both Wacker OH100 and Paraloid B44 coating material have more efficient and give considerable protection when the sample is immersed in salinity water for a week. The compressive strength of limestone decreases due to water action. Water absorption, porosity, and rock density are enhanced with the coating process.

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Stable Superhydrophobic Organic−Inorganic Hybrid Films by Electrostatic Self-Assembly

Cited by 197 publications

References 46 publications

Multiple Functionalities of Polyelectrolyte Multilayer Films: New Biomedical Applications

Multiple Functionalities of Polyelectrolyte Multilayer Films: New Biomedical Applications

Tunable Superhydrophobic and Optical Properties of Colloidal Films Coated with Block‐Copolymer‐Micelles/Micelle‐Multilayers

Protection of Limestone Coated with Different Polymeric Materials

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