Di-urea cross-linked siloxane hybrid materials incorporating oligo(oxypropylene) and oligo(oxyethylene) chains

Nunes, S. C.; Fernandes, Mariana; Gonçalves, Helena M. R.; Serrano, J.; Almeida, Paulo; Bermúdez, V. de Zea

doi:10.1007/s10971-020-05272-5

Cited by 3 publications

(4 citation statements)

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“…Other materials such as siloxane-polyether OIH materials, also known as di- or tri-ureasil, have also been widely reported [ 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ] for an extensive range of applications. The most common strategy to prepare such materials with the sol-gel method involves several hydrolysis and polycondensation reactions allowing their morphology, structure, and chemical composition to be tuned.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

et al. 2020

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This manuscript describes the synthesis and characterization of five new organic–inorganic hybrid (OIH) sol-gel materials that were obtained from a functionalized siloxane 3-glycidoxypropyltrimethoxysilane (GPTMS) by the reaction with the new Jeffamine®, namely three different diamines, i.e., EDR-148, RFD-270, and THF-170, a secondary diamine, i.e., SD-2001, and a triamine, i.e., T-403. The OIH sol-gel materials were characterized by UV-visible absorption spectrophotometry, steady-state photoluminescence spectroscopy, and electrochemical impedance spectroscopy. The reported OIH sol-gel materials showed that, with the exception of the samples prepared with Jeffamine® SD-2001, the transmittance values ranged between 61% and 79%. Regarding the capacitance data, the values reported changed between 0.008 and 0.013 nF cm−2. Due to their optical and electrical properties these new OIH materials show promising properties for applications as support films in an optical sensor area such as fiber sensor devices. Studies to assess the chemical stability of the OIH materials in contact with cement pastes after 7, 14, and 28 days were also performed. The samples prepared with THF–170 and GPTMS, when compared to the samples prepared with RFD-270 and T-403, exhibited improved behavior in the cement paste (alkaline environment), showing promising properties for application as support film in optical fiber sensors in the civil engineering field.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

et al. 2020

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“…The sol–gel process appeared a logical solution, since prior to the sol–gel transition, a reacting sol exhibits liquidlike viscosity. On account of a recent report, d-U(2000), a hybrid material belonging to the di-ureasil class, was chosen.…”

Section: Resultsmentioning

confidence: 99%

“…A set of two different polysiloxane resins has been employed here for this purpose: poly(dimethylsiloxane) (PDMS), to yield the negative replica, and poly(methylphenylsiloxane) (PMPS), to obtain the positive replica. To improve the fidelity of the leaflet imprinting, we decided to employ the sol–gel process. , Based on the fact that sol–gel-derived di-urea cross-linked short-chain poly(oxyethylene) (POE)/siloxane hybrid di-ureasil , films are promising candidates as mold materials for micropatterning applications, a di-ureasil film has been employed to produce a negative replica.…”

Section: Introductionmentioning

confidence: 99%

“…To improve the fidelity of the leaflet imprinting, we decided to employ the sol−gel process. 42,43 Based on the fact that sol−gel-derived di-urea cross-linked short-chain poly(oxyethylene) (POE)/siloxane hybrid diureasil 44,45 films are promising candidates as mold materials for micropatterning applications, 46 a di-ureasil film has been employed to produce a negative replica.…”

Section: ■ Introductionmentioning

confidence: 99%

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The Surfaces of the Ceratonia siliqua L. (Carob) Leaflet: Insights from Physics and Chemistry

et al. 2021

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The production of superhydrophobic coatings inspired by the surface of plant leaves is a challenging goal. Such coatings hold a bright technological future in niche markets of the aeronautical, space, naval, building, automobile, and biomedical sectors. This work is focused on the adaxial (top) and abaxial (bottom) surfaces of the leaflet of the Ceratonia silique L. (carob), a high-commercial-value Mediterranean tree cultivated in many regions of the world. The adaxial and abaxial surfaces feature hydrophobic and superhydrophobic behaviors, respectively. Their chemical composition is very simple: monopalmitin ester and palmitic acid are protuberant in the epicuticular and intracuticular wax layers of the adaxial surface, respectively, whereas 1-octacosanol dominates in the abaxial wax layers. In both surfaces, epicuticular wax is organized along a randomly oriented and intricate network of nanometer-thick and micrometer-long plates, whose density and degree of interconnection are significantly higher in the abaxial surface. The measured tilting angles for the abaxial surface (12–70°) reveal unusual variable density and water adhesion of the nanostructured plate-based texture. Optical measurements demonstrate that light reflectance/absorbance of the glaucous abaxial surface is significantly higher/lower than that of the nonglaucous adaxial surface. In both surfaces, diffuse reflectance is dominant, and the absorbance is weakly dependent on the light incidence angle. We show that the highly dense nanostructured platelike texture of the epicuticular abaxial layer of the C. siliqua leaflet works as a sophisticated light and water management system: it reflects solar radiation diffusely to lower the surface temperature, and it has superhydrophobic character to keep the surface dry. Such attributes enable efficient gas exchange (photosynthesis and respiration), transpiration, and evaporation. To mimic for the first time the abaxial surface, a templation approach was adopted using poly(dimethylsiloxane) (PDMS)/poly(methylphenylsiloxane) (PMPS) positive/negative replicas and a soft polymer/siloxane negative replica produced by the sol–gel process. Because high topographical variations of the biotemplate and wax adhesion to the biohybrid film affected the replication quality, the reproduction of the wax texture via the synthesis of 1-octacosanol-grafted siloxane-based hybrid materials is proposed as a suitable route to duplicate the abaxial surface with high fidelity. The natural chemical/physical strategy adopted by the C. siliqua leaflet to face the harsh Mediterranean climate is a powerful source of bioinspiration for the development of diffuse reflecting and superhydrophobic material systems with foreseen applications as dual-functional antiglare and water-repelling coatings.

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Organic–inorganic hybrid silica systems: synthesis strategies and optical applications

Onishi,

Costa,

Marchiori

et al. 2024

J Sol-Gel Sci Technol

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Di-urea cross-linked siloxane hybrid materials incorporating oligo(oxypropylene) and oligo(oxyethylene) chains

Cited by 3 publications

References 59 publications

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

Synthesis, Optical and Electrical Characterization of Amino-alcohol Based Sol-gel Hybrid Materials

The Surfaces of the Ceratonia siliqua L. (Carob) Leaflet: Insights from Physics and Chemistry

Organic–inorganic hybrid silica systems: synthesis strategies and optical applications

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