The spreading and superspeading behavior of new glucosamide-based trisiloxane surfactants on hydrophobic foliage

Zhang, Yue; Zhang, Gaoyong; Fu, Han

doi:10.1016/j.colsurfa.2005.10.024

Cited by 45 publications

(33 citation statements)

References 26 publications

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“…This result is similar to the result of Zhang et al [12]. Perhaps, the hydrophobic groups of double-tail trisiloxane surfactants can be absorbed more effectively on Parafilm surface and form a more tightly surfactant monolayer [12] or bilayer [13]. Among the four double-tail trisiloxane surfactants, only surfactant 1J solution has a good SA on the Parafilm (Table 4).…”

Section: Spreading Ability (Sa)supporting

confidence: 90%

Synthesis and Properties of Novel Double‐Tail Trisiloxane Surfactants with High Spreading Ability

Peng

Huang

Cao

2011

J Surfact & Detergents

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A new type of double-tail trisiloxane surfactants of the general formula R 1 NR 2 CH 2 CH(OH)CH 2 O (CH 2 CH 2 O)xCH 3 (x = 8.4, 12.9, 17.5, 22; R 1 = Me 3 SiO SiMe(CH 2 ) 3 OSiMe 3 , R 2 = CH 2 CH(OH)CH 2 OR 3 , R 3 = CH 2 CH(C 2 H 5 )CH 2 (CH 2 ) 2 CH 3 ) has been synthesized by reacting single-tail trisiloxane surfactants with 2-ethylhexyl glycidyl ether. Their structures were characterized with 1 H-NMR and 13 C-NMR spectroscopy. These doubletail trisiloxane surfactants reduce the surface tension of water to less than 24 mN/m at a level of 10 -5 mol/L. The spreading ability (SA) of the double-tail trisiloxane surfactant solution on Parafilm (or Ficus microcarpa leaf) surfaces is better than that on polyethylene terephthalate surface. The SA of the solution of the double-tail trisiloxane surfactants 1J with average ethoxy units of 8.4 is far better than the others, and its solution (5.0 9 10 -3 mol/L) possesses an SA value of over 15 within 10 min on Parafilm and Ficus microcarpa leaf surfaces. The surface tension values of aqueous solutions (1.0 9 10 -3 mol/L) of the double-tail trisiloxane surfactants 1J are still less than 25 mN/m over 21 days in an acidic environment (pH 4.0) and 139 days in an alkaline environment (pH 10.0), respectively. It is suggested that the SA and hydrolysis resistance of double-tail trisiloxane surfactants are able to be improved by changing the structure of the hydrophobic group, such as increasing the molar ratio of methyl to methylene.

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Section: Spreading Ability (Sa)supporting

confidence: 90%

Synthesis and Properties of Novel Double‐Tail Trisiloxane Surfactants with High Spreading Ability

Peng

Huang

Cao

2011

J Surfact & Detergents

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“…For example, common surfactants such as SDS and Tween 20 have high HLB values and are therefore best suited for emulsifying a hydrophobic substance into a water phase (oil into water). On the other hand, surfactants such as Silwet L-77 with HLB values near 10 are more suited for wetting, or the spreading of a water phase over surfaces such as leaves (1,40). These surfactants with balanced waterand oil-loving groups can be very effective as spreading agents capable of lowering the surface tension of water below 30 mN/m (21).…”

Section: Discussionmentioning

confidence: 99%

Novel High-Throughput Detection Method To Assess Bacterial Surfactant Production

Burch

Shimada

Browne

et al. 2010

Appl Environ Microbiol

106

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A novel biosurfactant detection assay was developed for the observation of surfactants on agar plates. By using an airbrush to apply a fine mist of oil droplets, surfactants can be observed instantaneously as halos around biosurfactant-producing colonies. This atomized oil assay can detect a wide range of different synthetic and bacterially produced surfactants. This method could detect much lower concentrations of many surfactants than a commonly used water drop collapse method. It is semiquantitative and therefore has broad applicability for uses such as high-throughput mutagenesis screens of biosurfactant-producing bacterial strains. The atomized oil assay was used to screen for mutants of the plant pathogen Pseudomonas syringae pv. syringae B728a that were altered in the production of biosurfactants. Transposon mutants displaying significantly altered surfactant halos were identified and further analyzed. All mutants identified displayed altered swarming motility, as would be expected of surfactant mutants. Additionally, measurements of the transcription of the syringafactin biosynthetic cluster in the mutants, the principal biosurfactant known to be produced by B728a, revealed novel regulators of this pathway.

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“…Due to their having many merits such as remarkably reducing the surface tension of water to 21 mN/m, having a good wetting power, stronger adhesion, an excellent spreading performance, a higher pore penetration coefficient, and a good anti-rain-washed performance, in recent decades trisiloxane surfactants have become of considerable interest to researchers in various countries [1][2][3][4][5][6]. General Electric Company's Silwet Ò Super Spreaders (GESSP) of the general formula Me 3 SiOSi(Me)(R)OSiMe 3 (R = (CH 2 ) 3 O(CH 2 CH 3 O) 8 CH 3 ), (CH 2 ) 3 O(CH 2 CH 3 O) 8 H) are a trisiloxane agricultural adjuvant available on the market. They are all single-tail and branched-chain trisiloxane surfactants.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Novel Double‐Tail Trisiloxane Surfactants

Peng

Lai

2009

J Surfact & Detergents

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To improve the hydrolysis resistant ability of trisiloxane surfactants, ethoxylated single-tail and doubletail trisiloxane surfactants of the general formulas Me 3 SiOSiMeR 1 OSiMe 3 (R 1 = (CH 2 ) 3 NHCH 2 CH(OH)CH 2 (OCH 2 CH 2 ) x OCH 3 ; x = 8.4, 12.9, 17.5, 22) and Me 3 SiOSiMeR 2 OSiMe 3 (R 2 = (CH 2 ) 3 NR 3 CH 2 CH(OH)CH 2 (OCH 2 CH 2 ) x OCH 3 ; R 3 = CH 2 (CH 2 ) y CH 3 ; x = 8.4, 12.9, 17.5, 22; y = 2, 6) were synthesized. Their structures were characterized by 1 H NMR and 13 C NMR. The surface activity and hydrolysis resistant properties of the trisiloxane surfactants prepared were also studied. The values of the critical micelle concentration of all trisiloxane surfactants prepared were at levels of 10 -5 and 10 -4 mol/L. They can reduce the surface tension of water to less than 24 mN/m. The hydrolysis resistant properties of double-tail trisiloxane surfactants are superior to those of single-tail trisiloxane surfactants. The double-tail trisiloxane surfactants 1B (x = 8.4; y = 2) and 2C (x = 12.9; y = 6) can be stable for 8 days in an acidic solution (pH 4.0) and 11 days in an alkaline environment (pH 10.0).

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The spreading and superspeading behavior of new glucosamide-based trisiloxane surfactants on hydrophobic foliage

Cited by 45 publications

References 26 publications

Synthesis and Properties of Novel Double‐Tail Trisiloxane Surfactants with High Spreading Ability

Synthesis and Properties of Novel Double‐Tail Trisiloxane Surfactants with High Spreading Ability

Novel High-Throughput Detection Method To Assess Bacterial Surfactant Production

Synthesis and Properties of Novel Double‐Tail Trisiloxane Surfactants

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