scholarly journals Structural Colors Based on Amorphous Arrays Comprised Solely of Silica Particles

2020 ◽  
Vol 10 (1) ◽  
pp. 420
Author(s):  
Dae-San Choi ◽  
Ju-Hwan Choi ◽  
Chang-Yull Lee
Keyword(s):  
Phenol Formaldehyde ◽  
Sol Gel ◽  
Silica Particles ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Structural Colors ◽  
Convection Oven ◽  
Sol Gel Process ◽  
One Step ◽  
The Stöber Method

In this study, structural colors were fabricated by producing an amorphous array with atypical silica particles. The colors were controlled by an array of silica particles with different sizes. In previous research, the process required inducement of the amorphous array, which was complex. Meanwhile, in this paper, we proposed a simple one-step process. First, spherical silica nanoparticles were synthesized using the sol-gel process of the Stöber method. Atypical silica particles that induced an amorphous array were produced by adding a small amount of phenol-formaldehyde resin. Subsequently, the colloidal silica was converted to a powder using a convection oven. The characteristics of the synthesized silica particles were confirmed using a scanning electron microscope (SEM). All the synthesized silica powders obtained structural colors. Finally, the silica powders were dispersed in deionized (DI) water and coated on a glass slide. We confirmed that the silica particles showed different structural colors depending on the size of the particles. We also found that the color was highly independent of the viewing angle.

Synthesis and characterization of boron and phosphorus-containing phenol formaldehyde resin-modified polyurethane composites

2020 ◽  
Vol 10 (7) ◽  
pp. 1057-1067
Author(s):  
Kuo-Hui Wu ◽  
Je-Chuang Wang ◽  
Min-Jhong Jheng ◽  
Yin-Chiung Chang
Keyword(s):  
Corrosion Protection ◽  
Phenol Formaldehyde ◽  
Salt Spray ◽  
Sol Gel ◽  
Composite Films ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Phosphorus Containing

Composite films with polyurethane (PU), phenol formaldehyde resin (PFR) and boron, phosphorus-containing phenol formaldehyde resins (P-PFR and B, P-PFR), were synthesized using sol–gel and copolymerization techniques. These composite films were deposited via spin-coating onto an aluminum alloy (AA) for improve the corrosion protection. The effects of different types of PFR on the structural, thermal and mechanical properties and corrosion resistance of the composites were investigated. The structures and morphologies of the composites were investigated by the gel permeation chromatography (GPC), Fourier transform infrared (FTIR), scanning electronic microscopy (SEM) and atomic force microscopy (AFM). It was shown from the dynamic mechanical analysis (DMA) and thermal gravimetric analysis (TGA) that the mechanical and thermal properties of PU were improved by incorporation of PFR, P-PFR and B, P-PFR. In addition, the PU/PFR composites provided an excellent corrosion protection in comparison with PU according to potentio-dynamic and salt-spray analyses.

Nanoparticles-Based Phenol-Formaldehyde Hybrid Resins

2008 ◽  
Vol 8 (6) ◽  
pp. 3142-3145 ◽  
Author(s):  
Genoveva Hernández-Padrón ◽  
Margarita García-Garduño ◽  
Miguel A. Canseco ◽  
Víctor M. Castaño
Keyword(s):  
Silica Nanoparticles ◽  
Phenol Formaldehyde ◽  
Sol Gel ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Coating Films ◽  
Corrosion Properties ◽  
Carboxylic Groups ◽  
Novel Material ◽  
New Material

The synthesis, characterization and corrosion properties of a novel material, produced by the reaction of silica nanoparticles with a functionalized Phenol-Formaldehyde Resin (PFR), are presented. Carboxylic groups were attached in situ to the PFR skeleton to produce a functionalized resin (PFR-SA), which is then reacted with sol–gel-prepared silica nanoparticles, yielding a novel hybrid (organic/inorganic) material (PFR-SA-nanoSiO2). This hybrid material was characterized by FT-IR, FT-Raman, TGA, DSC, SEM and corrosion tests, whose results showed significant improvement of the thermal properties in comparison with the PFR coating. In addition, the new material was efficient and durable against corrosion of metals, with the anticorrosive performance of PFR-SA and PFR-SA/nanoSiO2 coating films being superior to those of the original PFR coating.

Preparation and electrochemical characteristics of electrospun water-soluble resorcinol/phenol-formaldehyde resin-based carbon nanofibers

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40884-40891 ◽  
Author(s):  
Xiaodong Tian ◽  
Ning Zhao ◽  
Kai Wang ◽  
Defang Xu ◽  
Yan Song ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Specific Surface ◽  
Carbon Nanofibers ◽  
Porous Carbon ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Water Soluble ◽  
Formaldehyde Resin ◽  
Electrochemical Characteristics ◽  
One Step

Porous carbon nanofibers prepared by combining electrospinning and one-step activation exhibit remarkable capacitance performances due to the synergistic effect of the optimized pore size distribution, specific surface area and surface properties.

Nitrogen functionalized hierarchical microporous/mesoporous carbon with a high surface area and controllable nitrogen content for enhanced lead(ii) adsorption

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 92186-92196 ◽  
Author(s):  
Kunquan Li ◽  
Jinfan Cao ◽  
Hua Li ◽  
Jiamin Liu ◽  
Mingzhou Lu ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Phenol Formaldehyde ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Mesoporous Carbons ◽  
Lead Adsorption ◽  
Nitrogen Doped

Nitrogen-doped hierarchical microporous/mesoporous carbons (NHMCs) were conveniently fabricated for enhanced lead adsorption through a sol–gel method and NaOH-assisted activation with a soluble melamine–phenol–formaldehyde resin as a precursor.

Purification of water contaminated with heavy metals by example of lead as promising material based on graphene nanostructures

2020 ◽  
pp. 34-43
Author(s):  
N. R. Memetov ◽  
◽  
A. V. Gerasimova ◽  
A. E. Kucherova ◽  
◽  
...  
Keyword(s):  
Adsorption Process ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Parameter Estimates ◽  
Maximum Adsorption Capacity ◽  
Ecological Situation ◽  
Characteristic Parameters ◽  
Purification Of Water ◽  
Graphene Nanostructures

The paper evaluates the effectiveness of the use of graphene nanostructures in the purification of lead (II) ions to improve the ecological situation of water bodies. The mechanisms and characteristic parameters of the adsorption process were analyzed using empirical models of isotherms at temperatures of 298, 303, 313 and 323 K, which correspond to the following order (based on the correlation coefficient): Langmuir (0.99) > Temkin (0.97) > Dubinin – Radushkevich (0.90). The maximum adsorption capacity of the material corresponds to the range from 230 to 260 mg/g. We research the equilibrium at the level of thermodynamic parameter estimates, which indicates the spontaneity of the process, the endothermic nature and structure change of graphene modified with phenol-formaldehyde resin during the adsorption of lead (II) ions, leading to an increase in the disorder of the system.

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