Surface hydrophobic modification of TiO2 and its application to preparing PMMA/TiO2 composite cool material with improved hydrophobicity and anti-icing property

Qi, Yanli; Mao, Zepeng; Yang, Zhangbin; Zhang, Jun

doi:10.1016/j.conbuildmat.2020.120916

Cited by 28 publications

(12 citation statements)

References 48 publications

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“…XRD measures the grain size using the Scherrer equation but SEM measures particle size. Some areas on the surface of the PMMA-TiO 2 sample in Figure 5e clearly show the doping of the polymer and the homogeneity of the nanomaterial within the polymer matrix [32]. Due to the agglomeration of TiO 2 NPs in the PHEMA network as shown in the SEM image in Figure 5f, the transmittance of visible light in this sample decreased due to making these particles an obstacle to the passage of light in one direction.…”

Section: Discussionmentioning

confidence: 92%

“…Transmittance of all films was higher than 95%, indicating the homogeneity and compatibility of doping PMMA with TiO 2 NPs [31]. Figure 4 shows that due to the effect of doping PMMA with TiO 2 NPs, the transmittance percentage reduced to 98-96% [32]. However, the prepared nanocomposites were transparent and maintained value of transmittance above 95% in the visible region.…”

Section: Discussionmentioning

confidence: 96%

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Nano-Titanium Oxide in Polymeric Contact Lenses: Short Communication

et al. 2022

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Many individuals suffer from myopia or hyperopia and astigmatism owing to the refractive defects of the eye optics or because of the use of inappropriate contact lenses. This study dealt with three polymers Poly(methyl methacrylate) (PMMA), Poly(Hydroxyl methacrylate) (PHEMA), and Poly(glycidyl methacrylate) (PGMA) and doping them with TiO2 nanoparticles to evaluate the difference between the effect of each lens on the human eye. The TiO2 NPs were prepared in this work by the sol–gel method to obtain 70–90 nm sized particles. Modulation transfer (MTF) and spot diagram were assessed to measure ocular performance. The PGMA-TiO2 contact lens provided the highest image quality at the lowest probability (P) of about p < 0.0001 when inserted on an aberrated eye system because of its ability to eliminate the chromatic aberrations created inside the eyes having a smaller spot size.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 96%

Nano-Titanium Oxide in Polymeric Contact Lenses: Short Communication

et al. 2022

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“…We initially proposed that the low activity of TiO 2 was due to the poor interaction between a strong polar TiO 2 surface and weak polar hydrocarbon polymers. 31,32 Then, two types of organic modifiers, SA and siloxane, were used to change the polarity of the TiO 2 surface. Treating TiO 2 with 1 mol % SA did not improve the activity (entry 2).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Analysis of soluble monomers indicated that a 8 mol % yield of benzoic acid was obtained in the form of both benzoic acid and methyl benzoate when the unmodified TiO 2 was used. We initially proposed that the low activity of TiO 2 was due to the poor interaction between a strong polar TiO 2 surface and weak polar hydrocarbon polymers. , Then, two types of organic modifiers, SA and siloxane, were used to change the polarity of the TiO 2 surface. Treating TiO 2 with 1 mol % SA did not improve the activity (entry 2).…”

Section: Resultsmentioning

confidence: 99%

Heterogeneous Photocatalytic Oxidative Cleavage of Polystyrene to Aromatics at Room Temperature

Peng

Chen

2023

ACS Sustainable Chem. Eng.

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Heterogeneous photocatalytic aerobic oxidation systems have been developed for selective degradation of polystyrene (PS) to aromatic monomers at room temperature and ambient pressure. The TiO 2 particles modified with potassium stearate or N, N-diethyl-3-(trimethoxysilyl)propan-1-amine photocatalyzed the oxidative cleavage of commercial PS to benzoic acid with up to 43.5 mol % yield. Mechanistic studies revealed that the initial alkyl C−H oxidation and C−C cleavage were greatly improved by these alkaline modifiers. The superoxide anion radical and singlet oxygen acted as the key oxidative species during the degradation process. Common PS waste from daily life also underwent efficient degradation with 18−44.2 mol % yields of benzoic acid on the developed catalysts.

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“…TiO2 Nps modified with 3 wt% stearic acids greatly improved the hydrophobicity and anti-icing performance of this polymer. The obtained composite showed a contact angle of 115 o , freezing delay time of 555 s at -10 o C, and an increase in reflectivity in the visible and near-infrared regions by 57.3% and 42.4%, respectively [11]. Nafee et al [12] confirmed that doping of PMMA with Er2O3 useful for image sensing, light-emitting diodes (LED), and other nonlinear optical applications.…”

Section: Introductionmentioning

confidence: 94%

Preparation and characterization of CuO/Co3O4/poly(methyl methacrylate) nanocomposites for optical and dielectric applications

El-Sayed

Sayed

2021

J Mater Sci: Mater Electron

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Composites of transition metal oxides (TMOs)/Polymers have many modern technological, industrial, and biological applications. Co3O4 and CuO nanoparticles (Nps) were synthesized by sol-gel. Then they doped into poly(methyl methacrylate) (PMMA) via solution casting method. The obtained Nps and nanocomposite films were then investigated using several techniques. XRD and HR-TEM indicated the high purity of Co3O4 and CuO Nps of face-centered cubic (fcc) with 58 nm average particle size (Dav), and monoclinic structure with Dav = 35 nm, respectively. The amorphous nature of PMMA was influenced after mixing with these Nps. SEM and FTIR confirmed the interaction between Nps and the polymer chains. The pure film showed transparency of about 90% and Nps addition narrowed the optical bandgap effectively while keeping the films with high transmittance. CuO is more effective than Co3O4 on the optical parameters of the films.The dielectric constant improved after adding the Nps, while all films have a low dielectric loss.Additionally, the effects of Co3O4 and CuO on the ac conductivity, Argand plots, and the dielectric modulus are reported. Our nanocomposites are considered a promising candidate for nanotechnology-based devices such as electric stress control, film capacitors and anti-reflective coating for solar cell applications.

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Surface hydrophobic modification of TiO2 and its application to preparing PMMA/TiO2 composite cool material with improved hydrophobicity and anti-icing property

Cited by 28 publications

References 48 publications

Nano-Titanium Oxide in Polymeric Contact Lenses: Short Communication

Nano-Titanium Oxide in Polymeric Contact Lenses: Short Communication

Heterogeneous Photocatalytic Oxidative Cleavage of Polystyrene to Aromatics at Room Temperature

Preparation and characterization of CuO/Co3O4/poly(methyl methacrylate) nanocomposites for optical and dielectric applications

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