Nanooxide/Polymer Composites with Silica@PDMS and Ceria–Zirconia–Silica@PDMS: Textural, Morphological, and Hydrophilic/Hydrophobic Features

Sulym, Iryna; Goncharuk, E.V.; Sternik, Dariusz; Terpiłowski, Konrad; Deryło–Marczewska, Anna; Borysenko, M.V.; Gun’ko, Vladimir M.

doi:10.1186/s11671-017-1935-x

Cited by 28 publications

(25 citation statements)

References 56 publications

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“…For the DMDCS-treated sample, the FTIR spectra intensity of the O-H vibrations at 3364 cm -1 decreased gradually with increasing polymer absorption. This suggests that a notable amount of surface hydroxyls was disturbed by the DMDCS chains and that the amount of adsorbed water decreases (Sulym et al 2017). The band at 2960 cm -1 , i.e., the symmetric and asymmetric C-H stretching vibrations of the methyl groups, was also slightly enhanced.…”

Section: Surface Hydrophobicitymentioning

confidence: 96%

“…The WCA is an evaluation index for the hydrophobic performance of a surface (Olin et al 2013;Sulym et al 2017). A membrane surface with a WCA value greater than 90° is hydrophobic, and a surface with a value greater than 150° is generally considered to be superhydrophobic (Huang et al 2016).…”

Section: Sample Preparation For Wca Testmentioning

confidence: 99%

“…When infusing PDMS into wood, these macromolecular compounds filled the interspaces of wood cells and a thin film of PDMS covered on the wood surface (Shah et al 2017) to improve the wood's hydrophobic performance. The helical shape of PDMS, with six Si-O bonds in a ring, restricts the number of segments that can directly interact with a solid surface to form hydrogen bonds SiO-H…O(Si(CH3)2-)2 (Sulym et al 2017). It has been inferred that the hydrocarbon chain in PDMS efficiently displaced the hydrophilic-OH hydroxide radical with hydrophobic groups.…”

Section: Surface Hydrophobicitymentioning

confidence: 99%

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Effect of Hydrophobic Modification on Mechanical Properties of Chinese Fir Wood

et al. 2018

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The water repellency, elastic modulus, and hardness of hydrophobictreated and untreated wood cell walls were investigated. Chinese fir (CF; Cunninghamia lanceolata (Lamb.) Hook) wood was modified using polydimethylsiloxane (PDMS) and dimethyldichlorosilane (DMDCS) dissolved in n-hexane at 2%, 5%, and 8% (w/w) for 5 min, 30 min, and 2 h, respectively. A hydrophobic property was observed in the modified wood. The water contact angle value of the untreated wood surface was 85°, but after treatment this value increased to 147° and 143° for the PDMS-and DMDCS-treated wood, respectively. Increases in the elastic modulus and hardness of the wood cell wall were observed after PDMS treatment. These treatments also improved the water repellency of the wood surface, as verified by the reduction of the hydroxyl group O-H stretching vibrations at 3328 cm -1 . Compared to DMDCS, the PDMS treatment improved the hydrophobicity of wood surfaces and increased the nanomechanical properties of the wood cell wall. When an 8% concentration of PDMS and a 2 h treatment time were used, the treated wood showed the best mechanical properties.

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Section: Surface Hydrophobicitymentioning

confidence: 96%

Section: Sample Preparation For Wca Testmentioning

confidence: 99%

Section: Surface Hydrophobicitymentioning

confidence: 99%

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Effect of Hydrophobic Modification on Mechanical Properties of Chinese Fir Wood

et al. 2018

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“…CeO 2 proved to be an efficient reinforcing agent for natural rubber [17]. As additives to silicones, generally, in studies reported in literature [9,18], REO have been used together with silica (Ceria/Silica [9] or Ceria-Zirconia-Silica@PDMS [18]). There is a report in 1974 [19] about the thermostabilizing effect of rare-earth metal oxides on methylvinylsilicone rubbers.…”

Section: Introductionmentioning

confidence: 99%

Silicone elastomers filled with rare earth oxides

Iacob¹,

Airinei²,

Asăndulesa³

et al. 2020

Mater. Res. Express

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Silicones which possess, amongst others, remarkable mechanical properties, thermal stability over a wide range of temperatures and processability, and rare earth oxides (REO), known for their unique optic, magnetic and catalytic properties can be coupled into multifunctional composite materials (S-REOs). In addition, the intrinsic hydrophobicity of REO and polysiloxanes makes them easily compatible without the need for surface treatments of the former. Thus, europium oxide (Eu 2 O 3 ), gadolinium oxide (Gd 2 O 3 ) and dysprosium oxide (Dy 2 O 3 ) in amounts of 20 pph are incorporated as fillers into silicone matrices, followed by processing mixture as thin films and crosslinking at room temperature. The analysis of the obtained films reveals the changes induced by these fillers in the thermal, mechanical, dielectric and optical properties, as well as the hydrophobicity of the silicones. The luminescence properties of S-REO composites were investigated by fluorescence spectra and lifetime -resolved measurements with a multiemission peaks from blue to greenish register. The thermogravimetrical analysis indicates an increasing of thermal stability of the composites that contain REO, compared to pure silicone. As expected, the dielectric permittivity significantly increased due to nature of the fillers, while the dielectric loss values are relatively low for all samples, indicating a minimal conversion of electrical energy in the form of heat within bulk composites. The presence of rare earth oxides into the silicone matrix facilitates the motions of long-range charge carriers through the network resulting in higher values of conductivity of the composite films. The stress-strain measurements revealed the reinforcing effect of the rare earth metal oxides on a silicone matrix, leading to a significant increase of Young modulus. The known hydrophobicity of silicones is further enhanced by the presence of REO.

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“…Note that different aspects of the interactions of PDMS-hydrophobized silicas with water, as well as other adsorbates, have been analyzed elsewhere. 41,50,62−65 Typically, uniform hydrophobic surfaces, for example, modified by PDMS fragments, are characterized by a contact angle for settled water drops not greater than θ c = 120°. Nano/microstructured hydrophobic particles (structures) can provide much larger θ c —up to 170° due to a surface geometry factor.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Amorphous Silicas Hydrophobized by Various Pathways

Protsak

Гунько

Henderson³

et al. 2019

ACS Omega

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Various nanostructured amorphous silicas [fumed silicas such as crude (A-300), hydro-compacted (cA-300, TS 100), and precipitated silica Syloid 244] were modified by different polydimethylsiloxanes such as PDMS5, PDMS100, PDMS200, PDMS1000, and PDMS12500 (the label numbers show the viscosity (η) values) using dimethyl carbonate (DMC) as a siloxane-bond-breaking reagent. In addition, hexamethyldisilazane was used to modify fumed silica cA-300. The nanocomposites were characterized using microscopy, infrared spectroscopy, thermodesorption, nitrogen adsorption–desorption, solid-state NMR spectroscopy, small-angle X-ray scattering, and zeta-potential methods. It was found that the morphological, textural, and structural characteristics of silicas grafted with PDMS depend strongly not only on the type and content of the polymers used but also on the organization of nonporous nanoparticles (NPNP) in secondary structures (aggregates of NPNP and agglomerated aggregates, ANPNP), as well on the reaction temperature ( T r ). Specifically, we determined that ANPNP with a macro/mesoporous character are favorable for the effective modification of the silicas studied with short polymers and no DMC addition but at higher temperatures or for a longer silicone polymer with the presence of DMC and at lower temperatures. In particular, the PDMS/DMC-modified silicas are of great interest from a practical point of view because they remain in a dispersed state with no strong compaction of the secondary structures after modification, and this corresponds to a better distribution of the modified nanoparticles in polymeric or other matrices.

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Nanooxide/Polymer Composites with Silica@PDMS and Ceria–Zirconia–Silica@PDMS: Textural, Morphological, and Hydrophilic/Hydrophobic Features

Cited by 28 publications

References 56 publications

Effect of Hydrophobic Modification on Mechanical Properties of Chinese Fir Wood

Effect of Hydrophobic Modification on Mechanical Properties of Chinese Fir Wood

Silicone elastomers filled with rare earth oxides

Nanostructured Amorphous Silicas Hydrophobized by Various Pathways

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