Anti-fog chitosan/sodium lauryl ether sulfate films

Florea-Spiroiu, Manuela; Achimescu, Diana; Stănculescu, Ioana; Purica, M.; Gavrıla, Raluca; Peretz, Sandu

doi:10.1007/s00289-013-1023-z

Cited by 12 publications

(10 citation statements)

References 23 publications

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“…In order to evaluate the antifogging properties of a surface the ASTM F 659‐06 protocol can be utilized. [ 43 ] This protocol implies that a surface can be considered as antifogging when 80% of an incoming light is still transmitted after a 30 s exposure to a humid environment. We therefore evaluated the optical transmittance of our surfaces after exposing them to fog flow.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Wetting Properties at Extremes States to Obtain Antifogging Functionality

Tzianou

Thomopoulos

Vourdas

et al. 2020

Adv Funct Materials

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Fog formation decreases light transmission of optically clear materials. A promising approach to address this problem is to control the wetting properties of the material at extremes states, which requires imparting micro and nano morphology features on the surface. However, such features may affect the optical properties of the surface. In this work, superhydrophobic and superhydrophilic surfaces, with different morphology characteristics ranging from nanoscale to hierarchical micro-nanoscale are fabricated and evaluated in order to investigate which wetting extreme and surface morphology is more suitable to preserve the light-transmitting properties and exhibit antifogging functionalities. The performance of the aforementioned surfaces is compared for the first time in two different testing modes: under intense fog flow and no surface cooling, and under no-flow and surface cooling, which enhances dew condensation on the surfaces. It is demonstrated that superhydrophilic surfaces with nanoscale morphology maintain their optical transmittance under fog flow for more than 20 min. This duration is one of the longest reported in the literature revealing the long-term antifogging functionality of the proposed surfaces. Finally, by tailoring the morphology and the surface wetting properties, an optically switching surface (initially "milky" which becomes "clear") when exposed to humidity is demonstrated.

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Section: Resultsmentioning

confidence: 99%

Tailoring Wetting Properties at Extremes States to Obtain Antifogging Functionality

Tzianou

Thomopoulos

Vourdas

et al. 2020

Adv Funct Materials

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“…The coatings are made of natural or synthetic water-soluble polymers (WSPs) containing hydrophilic functional groups, e.g. hydroxyl (OH) [15][16][17][18], carboxyl or ester groups (COOH/COOR), [16,17,19], amine (NH 2 ) [16,20,21], sulfonic (SO 3 H) or dihydrophosphate groups (PO 4 H 2 ) [22]. The main reason for using such polymers is that these groups are capable of interacting with water molecules, usually through hydrogen bonds and dipolar interactions, which leads to formation of a continuous or quasi--continuous layer of water.…”

Section: Methods Of Protecting Transparent Materials Against Steamingmentioning

confidence: 99%

“…increase hydrophilic or hydrophobic character, these polymers can be modified through introduction of appropriate functional groups. The water-soluble polymers used for production of anti-fog (dew-resistant) coatings include pullulan [15], chitosan [16,19,20], cellulose derivatives such as quaternary cellulose [17], carboxymethylcellulose [16,17,19] and its nanocrystals [21], alginate and hyaluronic acid [16]. The synthetic water-soluble poly-mers used for the same purpose are, e.g.…”

Section: Methods Of Protecting Transparent Materials Against Steamingmentioning

confidence: 99%

Effective method for the production of anti-fog (dew-resistant) coatings based on bifunctional polysiloxanes

et al. 2020

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Anti-fog (dew-resistant) coatings were produced employing as active components bifunctional polysiloxanes containing polyether (hydrophilic and polar) groups and trialkoxysilyl groups (permitting durable adhesion to glass surface). These bifunctional polysiloxanes were obtained as a result of consequent hydrosilylation of allyl polyethers and vinyltrialkoxysilane with the use of poly(dimethyl-co--hydromethyl)siloxane. The effect of structure of the polysiloxane used (length of siloxane chain, length of polyether chain, content of functional groups) and its concentration of the coating performance were analyzed. The designed preparation permits easy production of a durable anti-fog and dew-resistant coating from widely accessible raw materials and with no need of special pretreatment of glass surface.

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“…In the last five years, various research groups have demonstrated that the incorporation of natural polymers, such as carboxymethyl cellulose (CMC), chitosan (CHI), and other polysaccharides [167][168][169]; and synthetic polymers, such as polyvinyl and polyacrylic compounds [170][171][172][173][174], into anti-fogging formulations can be successfully attained via LbL. For example, Spiroiu's group [175] fabricated anti-fogging layers with WCA exceeding 90°, based on self-assembled structures of CHI and sodium lauryl ether sulfate micelles, while Lee's group [176] developed zwitter-wettable coatings comprising a hydrophilic bottom layer of (CHI/CMC)30 capped with three hydrophobic (CHI/Nafion) bilayers (WCA = 110°). As did Shibraen's and Cohen's groups [169,170], these research groups considered the water-absorbing characteristics of these coatings to account for the observed anti-fogging performance and, in some cases, the frosting delay capacity (percolation mechanism) [170,171].…”

Section: Layer-by-layer Depositionmentioning

confidence: 99%

“…The main reason for this lies in the fact that this rule only holds true for nonporous anti-fogging coatings whose surface features do not display time-dependent behavior. In addition to the contact angle, several factors related to fogging effects, such as the number and the size of water drops [99,109], surface rearrangement phenomena [170], as well as the capability of the coating to transport water molecules [175,176], must also be considered to establish a more robust anti-fogging criterion.…”

Section: Concluding Remarks and Outlookmentioning

confidence: 99%

Water drop-surface interactions as the basis for the design of anti-fogging surfaces: Theory, practice, and applications trends

Durán

Laroche

2019

Advances in Colloid and Interface Science

119

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Glass-and polymer-based materials have become essential in the fabrication of a multitude of elements, including eyeglasses, automobile windshields, bathroom mirrors, greenhouses, and food packages, which unfortunately mist up under typical operating conditions. Far from being an innocuous phenomenon, the formation of minute water drops on the surface is detrimental to their optical properties (e.g., light-transmitting capability) and, in many cases, results in esthetical, hygienic, and safety concerns. In this context, it is therefore not surprising that research in the field of fog-resistant surfaces is gaining in popularity, particularly in recent years, in view of the growing number of studies focusing on this topic. This review addresses the most relevant advances released thus far on anti-fogging surfaces, with a particular focus on coating deposition, surface micro/nanostructuring, and surface functionalization. A brief explanation of how surfaces fog up and the main issues of interest linked to fogging phenomenon, including common problems, anti-fogging strategies, and wetting states are first presented. Anti-fogging mechanisms are then discussed in terms of the morphology of water drops, continuing with a description of the main fabrication techniques toward anti-fogging property. This review concludes with the current and the future perspectives on the utility of anti-fogging surfaces for several applications and some remaining challenges in this field.

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Anti-fog chitosan/sodium lauryl ether sulfate films

Cited by 12 publications

References 23 publications

Tailoring Wetting Properties at Extremes States to Obtain Antifogging Functionality

Tailoring Wetting Properties at Extremes States to Obtain Antifogging Functionality

Effective method for the production of anti-fog (dew-resistant) coatings based on bifunctional polysiloxanes

Water drop-surface interactions as the basis for the design of anti-fogging surfaces: Theory, practice, and applications trends

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