Effect of chain length on the wetting properties of alkyltrichlorosilane coated cellulose-based paper

Tang, Zhenguan; Li, Hanyang; Hess, Dennis W.; Breedveld, Victor

doi:10.1007/s10570-016-0877-2

Cited by 54 publications

(45 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, surfactants or polymers are commonly used in many industries, which also have long-chain structures. In a LLS system with chain molecules, the moving contact line is greatly affected by the adsorption properties of the chain molecules on the solid surfaces, 26 which display orientation arrangement in the adsorption layers. 27,28 The orientation arrangement is determined by the solid-liquid interactions and the chain structures of the liquid molecule.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers showed that the chain molecules tend to be parallel to the solid surfaces 27 and the chain length has obvious effects on the contact line friction. 26,28 For this case, the singlemolecule adsorption-desorption mechanism may be invalid since the molecules on the surface are hard to jump forward. Besides, a chain molecule will have torsion during its move, which exerts local deformations at the nanoscale near the contact line; 29 the local deformations will induce extra unbalanced forces due to the interfacial deformations, thereby affecting the moving contact line.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Moving mechanisms of the three-phase contact line in a water–decane–silica system

et al. 2019

View full text Add to dashboard Cite

The movement of the three-phase contact line with chain molecules in the liquid phase displays more complex mechanisms compared to those in the usual liquid-liquid-solid systems and even to the gasliquid-solid systems controlled by the traditional single-molecule adsorption-desorption mechanisms.By introducing decane molecules with chain structures, we demonstrate from molecular dynamics insights that the moving mechanism of the contact line in a water-decane-silica system is totally different from traditional mechanisms. Three different wettability-related moving mechanisms including "Roll up", "Piston" and "Shear" are revealed corresponding to the hydrophilic, intermediate and hydrophobic three-phase wettability, respectively. In the "Roll up" mechanism, the decane molecules are rolled up by the competitively adsorbed water molecules and then move forward under the driving force; when the "Piston" mechanism happens, the decane molecules are pushed by the piston-like water phase owing to the comparable adsorption interactions of the two liquids on the solid surface; in the "Shear" mechanism, the contact line is hard to drive due to the stronger decane-silica interactions but the decane molecules far away from the solid surface will move forward. Besides, the time-averaged velocity of the moving contact line is greatly related to the moving mechanisms. For the "Roll up" mechanism, the contact line velocity increases first and then reaches a steady value; for the "Piston" mechanism, the contact line velocity has a maximum value at the start-up stage and then decreases to a stable value; for the "Shear" mechanism, the contact line velocity fluctuates around zero due to the thermal fluctuation of the molecules. Additionally, the mean distance from Molecular Kinetics Theory increases with decreasing hydrophilicity and the displacement frequency in "Roll up" mechanism is 2 orders of magnitude higher than that in the "Piston" mechanism, further demonstrating the different moving mechanisms from a quantitative point of view. Fig. 7 MKT parameters. (a) Velocity plotted in logarithmic scale versus cos q d . (b) Parameters l and K 0 of the MKT at different three-phase wettabilities and the comparison with other works.This journal is

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Moving mechanisms of the three-phase contact line in a water–decane–silica system

et al. 2019

View full text Add to dashboard Cite

show abstract

“…16,[20][21][22][23][24][25][26][27][28] The reaction of trihalosilanes with material surfaces has been hypothesized to lead to (i) well-ordered single-molecule monolayers, (ii) a cross-linked monolayer either fully or partially attached to the surface, and (iii) the formation of short-chain silsesquioxanes, cyclic oligomers of about 2-5 nm. 16,26,[29][30][31][32][33][34][35][36] We believe that the lack of consensus may, in part, be due to challenges in controlling surface-bound water.…”

Section: Introductionmentioning

confidence: 99%

Recruiting physisorbed water in surface polymerization for bio-inspired materials of tunable hydrophobicity

et al. 2016

View full text Add to dashboard Cite

International audienceChemical grafting has been widely used to modify the surface properties of materials, especially surface energy for controlled wetting, because of the resilience of such coatings/modifications. Reagents with multiple reactive sites have been used with the expectation that a monolayer will form. The step-growth polymerization mechanism, however, suggests the possibility of gel formation for hydrolyzable moieties in the presence of physisorbed water. In this report, we demonstrated that using alkyltrichlorosilanes (trivalent [i.e., 3 reactive sites]) in the surface modification of a cellulosic material (paper) does not yield a monolayer but rather gives surface-bound particles. We infer that the presence of physisorbed (surface-bound) water allows for polymerization (or oligomerization) of the silane prior to its attachment on the surface. Surface energy mismatch between the hydrophobic tails of the growing polymer and any unreacted bound water leads to the assembly of the polymerizing material into spherical particles to minimize surface tension. By varying paper grammage (16.2–201.4 g m À2), we varied the accessible surface area and thus the amount of surface-adsorbed water, allowing us to control the ratio of the silane to the bound water. Using this approach, polymeric particles were formed on the surface of cellulose fibers ranging from $70 nm to a film. The hydrophobicity of the surface, as determined by water contact angles, correlates with particle sizes (p < 0.001, Student's t-test), and, hence, the hydrophobicity can be tuned (contact angle between 94 and 149). Using a model structure of a house, we demonstrated that as a result of this modification, paper-based houses can be rendered self-cleaning or tolerant to surface running water. In another application, we demonstrated that the felicitous choice of architectural design allows for the hydrophobic paper to be used for water harvesting

show abstract

“…Silane with shorter alkyl chain in the molecules has higher surface energy. [33] This could be another reason leading to lower hydrophobicity. Figure 2 shows the scanning electron microscopy (SEM) and atomic force microscopy (AFM) images of the silane-treated substrates.…”

Section: Resultsmentioning

confidence: 99%

Argon Plasma Treatment of Fluorine‐Free Silane Coatings: A Facile, Environment‐Friendly Method to Prepare Durable, Superhydrophobic Fabrics

Liu

Zhou

Wang

et al. 2017

Adv Materials Inter

View full text Add to dashboard Cite

A novel method to prepare durable superhydrophobic fabrics through pre‐applying an alkyl silane (alkyl chain longer than C15) onto fabric substrate and by subsequent vacuum plasma treatment in argon is reported. The treated fabrics show a contact angle of 154.2° with low contact angle hysteresis (sliding angle 4.5°). The coatings are durable and can withstand 150 cycles of standard laundries. The argon plasma treatment is found to significantly enhance SiOSi bonding among the silane molecules, leading to a highly crosslinked silica network. The silane coating also shows high optical transparency. Apart from fabrics, other substrates such as filter paper, plastic film, glass slide, silicon wafer, and metal are treated in a similar way, and all the treated surface show durable hydrophobicity, though the contact angle is lower than that of the coated fabrics. Post‐crosslinking of silane through argon plasma treatment may offer a facile but environment‐friendly way to prepare durable superhydrophobic fabrics.

show abstract

Effect of chain length on the wetting properties of alkyltrichlorosilane coated cellulose-based paper

Cited by 54 publications

References 45 publications

Moving mechanisms of the three-phase contact line in a water–decane–silica system

Moving mechanisms of the three-phase contact line in a water–decane–silica system

Recruiting physisorbed water in surface polymerization for bio-inspired materials of tunable hydrophobicity

Argon Plasma Treatment of Fluorine‐Free Silane Coatings: A Facile, Environment‐Friendly Method to Prepare Durable, Superhydrophobic Fabrics

Contact Info

Product

Resources

About