Dispersibility and Hydrophobicity Analysis of Titanium Dioxide Nanoparticles Grafted with Silane Coupling Agent

2011 ◽  
Vol 50 (21) ◽  
pp. 11930-11934 ◽  
Author(s):  
Chaoxia Wang ◽  
Haiyan Mao ◽  
Chunxia Wang ◽  
Shaohai Fu
Keyword(s):  
Titanium Dioxide ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Titanium Dioxide Nanoparticles ◽  
Silane Coupling ◽  
Hydrophobicity Analysis

Preparation and Modification of Nanometer TiO2 with High Reflectivity

2014 ◽  
Vol 1004-1005 ◽  
pp. 51-54
Author(s):  
Su Zhao ◽  
Sha Sha Liu ◽  
Yan Jun Guo ◽  
Wei Wei
Keyword(s):  
Titanium Dioxide ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Sol Gel ◽  
Reaction System ◽  
High Reflectivity ◽  
Titanium Dioxide Powder ◽  
Dioxide Powder ◽  
Silane Coupling ◽  
Nano Titanium Dioxide

In order to prepare high reflectivity titanium dioxide, by sol - gel method after nano-titanium dioxide powder, which silane coupling agent KH-570 covering it and make its surface modification.When the reaction temperature is 40 °C, drop accelerated rate 1.5mL/min, calcination temperature about 600 °C, got titanium dioxide with relatively high reflectivity and particle size in around 65 nm.When the amount of the silane coupling agent is 0.5%, the pH of reaction system is 6.5, and the reaction time was 1.5h, the nano-modified titanium dioxide particles with high reflectance.

Preparation and Modification of Nano- TiO2 Pigment for Coating

2010 ◽  
Vol 146-147 ◽  
pp. 1675-1680
Author(s):  
Xiao Hui Zhang ◽  
Qi Guang Cao ◽  
Lin Hu ◽  
Jian Yu Cui
Keyword(s):  
Titanium Dioxide ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Sol Gel ◽  
Raw Material ◽  
Tem Analysis ◽  
Titanium Dioxide Powder ◽  
Dioxide Powder ◽  
Silane Coupling ◽  
Nanoscale Titanium Dioxide

Nanoscale titanium dioxide powder were prepared in terms of sol-gel process with Ti(OC4H9) as raw material. TEM analysis show that the size of nanoparticle are between 50～ 100nm.The results of XRD test indicate that the crystal style of the product is rutile type. In order to apply nanoscale titanium dioxide to coating as pigment, the nanoscale particles were modified in terms of esterifying reaction,silane coupling agent and organic titanate coupling agent. The results of contact angle test show that the oleophilic of modified product with organic titanate coupling agent is stronger than that with silane coupling agent and esterifying reaction.

scholarly journals Improvement in the dispersion of TiO2 particles inside Chitosan-Methyl cellulose films by the use of silane coupling agent

2019 ◽  
Vol 63 (2) ◽  
Author(s):  
Enrique Delgado Alvarado ◽  
Mariana Gisela Peña Juárez ◽  
Cristina Perez Perez ◽  
Elias Perez ◽  
Jose Amir Gonzalez
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Composite Films ◽  
Methyl Cellulose ◽  
Electrostatic Repulsion ◽  
Cellulose Films ◽  
Tio2 Particles ◽  
Silane Coupling

Abstract. This work is focused on obtaining composite films based on biopolymer of chitosan and on TiO2 superficially modified through a silanization method, using (3-aminopropyl)-trimethoxysilane (APTMS). This method helped solve specific problems of titanium dioxide, such as the formation of agglomerates, since modified films have a better dispersion. The inclusion of particles in the biopolymer films helped to improve color properties, obtaining luminescence results up to 20% higher than the unmodified particles, which indicates a better dispersion of particles. In addition, there were improvements in the electrostatic repulsion, studied as Z potential, with values of 10 mV for TiO2 and 27 mV for S-TiO2. Finally, better results were obtained in the mechanical properties of the silanized particles, with an improvement of around 28% in low percentages, rising the percentage by increasing S-TiO2. Resumen. Este trabajo está enfocado en obtener películas compuestas basadas en el biopopolímero quitosan y en TiO2 modificado superficialmente mediante un método de silanización, utilizando (3-aminopropil) trimetoxisilano (APTMS). Este método ayudó a resolver problemas particulares del dióxido de titanio, como lo son la formación de aglomerados, ya que las películas modificadas tienen una mejor dispersión. La inclusión de partículas en las películas de biopolímeros ayudó a mejorar las propiedades de color, obteniendo resultados de luminiscencia hasta en un 20% mayor que las partículas no modificadas, lo cual es indicador de una mejor dispersión de partículas. También se tuvieron mejoras en la repulsión electrostática, estudiada como potencial Z, con valores desde 10 mV para TiO2 a 27 mV para S-TiO2. Finalmente, también se tuvieron mejores resultados en las propiedades mecánicas de las partículas silanizadas, con una mejora de alrededor del 28% a bajos porcentajes, incrementando valores al aumentar el porcentaje de S-TiO2.  

Hydrophilic carrageenan functionalized magnetic carbon‐based framework linked by silane coupling agent for the enrichment of N ‐glycopeptides from human saliva

2021 ◽  
Author(s):  
Xueting Jin ◽  
Canhong Zhu ◽  
Jiani Wu ◽  
Yinghua Yan ◽  
Chuan‐Fan Ding ◽  
...  
Keyword(s):  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Human Saliva ◽  
Silane Coupling ◽  
Magnetic Carbon ◽  
Carbon Based

scholarly journals Improved Hydrophobicity of Macroalgae Biopolymer Film Incorporated with Kenaf Derived CNF Using Silane Coupling Agent

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2254
Author(s):  
Adeleke A. Oyekanmi ◽  
N. I. Saharudin ◽  
Che Mohamad Hazwan ◽  
Abdul Khalil H. P. S. ◽  
Niyi G. Olaiya ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Cellulose Nanofibrils ◽  
Hydroxyl Groups ◽  
Water Contact ◽  
Silane Coupling ◽  
Cnf Films ◽  
Kenaf Bast ◽  
Thermal Stability Of

Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The macroalgae CNF film was after that treated with silane for hydrophobicity enhancement. The wettability and functional properties of unmodified macroalgae CNF films were compared with silane-modified macroalgae CNF films. Characterisation of the unmodified and modified biopolymers films was investigated. The atomic force microscope (AFM), SEM morphology, tensile properties, water contact angle, and thermal behaviour of the biofilms showed that the incorporation of Kenaf bast CNF remarkably increased the strength, moisture resistance, and thermal stability of the macroalgae biopolymer films. Moreover, the films’ modification using a silane coupling agent further enhanced the strength and thermal stability of the films apart from improved water-resistance of the biopolymer films compared to unmodified films. The morphology and AFM showed good interfacial interaction of the components of the biopolymer films. The modified biopolymer films exhibited significantly improved hydrophobic properties compared to the unmodified films due to the enhanced dispersion resulting from the silane treatment. The improved biopolymer films can potentially be utilised as packaging materials.

Surface-treated fish scale powder with silane coupling agent in asphalt for performance improvement: Conventional properties, rheology, and morphology

2021 ◽  
pp. 127772
Author(s):  
Songtao Lv ◽  
Long Hu ◽  
Chengdong Xia ◽  
Xinghai Peng ◽  
Milkos Borges Cabrera ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Fish Scale ◽  
Silane Coupling ◽  
Treated Fish

Evaluation of epoxy asphalt rubber with silane coupling agent used as tack coat for seasonally frozen orthotropic steel bridge decks

2020 ◽  
Vol 241 ◽  
pp. 117957 ◽  
Author(s):  
Qibo Huang ◽  
Zhendong Qian ◽  
Leilei Chen ◽  
Meng Zhang ◽  
Xiaorui Zhang ◽  
...  
Keyword(s):  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Bridge Decks ◽  
Steel Bridge ◽  
Asphalt Rubber ◽  
Epoxy Asphalt ◽  
Silane Coupling ◽  
Tack Coat

A DENSITY FUNCTIONAL STUDY OF THE STRUCTURE OF SILANE COUPLING AGENT 3–AMINOPROPYLTRIETHOXYSILANE

2005 ◽  
Vol 04 (01) ◽  
pp. 117-126
Author(s):  
N. L. MA ◽  
P. WU
Keyword(s):  
Coupling Agent ◽  
Density Functional ◽  
Solution Structure ◽  
Silane Coupling Agent ◽  
Industrial Applications ◽  
Functional Study ◽  
Stable Form ◽  
Functional Theory ◽  
Silane Coupling ◽  
The Stability

Using density functional theory, we predicted the solution structure of the hydrolyzed 3–aminopropyltriethoxysilane (h–APS), which is a silane coupling agent commonly used in many industrial applications. We have located five stable minima on the potential energy surface of h–APS in which four of them are "neutral", and the remaining one is zwitterionic (dipolar) in nature. Our calculations suggested that the stability of the most stable form of h–APS in water (denoted as II_N) arose from strong intramolecular OH ⋯ N hydrogen bond. The least stable form is the zwitterionic form (I_ZW), which is estimated to be over 90 kJ mol -1 less stable than II_N. The factors governing the relative stabilities of different forms are discussed.

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