SURFACE MODIFICATION OF NANO TITANIUM DIOXIDE (TiO2) BY CATIONIC SURFACTANTS AND INVESTIGATION OF ITS EFFECT ON THE PROPERTIES OF NATURAL RUBBER (NR) NANOCOMPOSITES

2019 ◽  
Vol 93 (2) ◽  
pp. 346-359
Author(s):  
Kumarjyoti Roy ◽  
Debdas Sikdar ◽  
Swapan Kumar Mandal ◽  
Subhas Chandra Debnath
Keyword(s):  
Titanium Dioxide ◽  
Surface Modification ◽  
Natural Rubber ◽  
Cationic Surfactants ◽  
Mechanical And Thermal Properties ◽  
Tetraethylammonium Bromide ◽  
Nano Tio2 ◽  
Uniform Dispersion ◽  
Surface Modified ◽  
Nano Titanium Dioxide

ABSTRACT We investigate the reinforcing effects of both unmodified and surface modified nano titanium dioxide (TiO2) on the cure, mechanical, and thermal properties of natural rubber (NR) nanocomposites. The surface of nano TiO2 is modified by cationic surfactants cetyltrimethylammonium bromide (CTAB) and tetraethylammonium bromide (TEAB). The surface modification of nano TiO2 is characterized by Fourier transform infrared (FTIR) spectra and Field emission scanning electron microscopy (FESEM). The result reveals that surface modified nano TiO2 is much more efficient in improving the resulting properties of NR nanocomposites in comparison with unmodified nano TiO2. The excellent improvement in the properties of surface modified nano TiO2/NR composites is due to the better hydrophobicity and uniform dispersion of modified nano TiO2 within the NR matrix, as confirmed from morphological analysis. CTAB is much more effective than TEAB with respect to the properties of nano TiO2 based NR composites.

Bio-Effects of Nano-Titanium Dioxide on Lungs of Mice

2009 ◽  
Vol 610-613 ◽  
pp. 130-135
Author(s):  
Yan Yan Zhang ◽  
Jie Tao ◽  
Pin Ting He ◽  
Yu Xin Tang ◽  
Yue Qin Wang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Low Dose ◽  
Pulmonary Inflammation ◽  
Control Group ◽  
High Dose ◽  
Control Groups ◽  
Nano Tio2 ◽  
Body Weights ◽  
Nano Titanium Dioxide ◽  
Risk Potential

To evaluate the acute lung toxicity of intratracheally instilled nano-titanium dioxide (TiO2) in Kunming mice, healthy adult Kunming mice were randomly grouped by their body weights (5 mice in each group). The lungs of mice were intratracheally instilled with 1 mg/kg•bw or 10 mg/kg•bw of nm-TiO2. The control group was intratracheally instilled the same volume physiological brine. After exposure of 1, 7, 14 and 28 days, the bronchoalveolar lavage (BAL) fluid and lung tissue were collected. The indexes in BAL fluid were examined. Lung tissues were assessed by histopathology. The results showed that all indexes of 10mg/kg•bw groups were obviously higher than those of the control group and the group of nano-1mg/kg•bw. Activities of LDH on the 1st, 7th, 14th and 28th day post-exposure (pe), contents of MDA on the 1st, 7th and, 14th day pe and TP on the 1st and 7th day pe as well as the amount of leukocyte on the 1st and 7th day pe of 10mg/kg•bw groups were significantly different compared with control groups (P<0.05).There were no obvious changes observed in the activity of ATP within groups (P>0.05). Histopathology found that lungs of 10mg/kg•bw groups presented great increase in pulmonary inflammation. Many TiO2 particles were still clearly found in the interstitium at 28 days pe. In contrast, low-dose instillation had a low risk potential for producing adverse pulmonary health effects. We conclude that the inflammatory reaction gradually eased after 28 days pe. Under the same experimental condition, the effect of lung injury was severer in high-dose nano-TiO2 than low-dose nano-TiO2.

Synthesis and Structural Characterization of Surface-Modified TiO2

2010 ◽  
Vol 129-131 ◽  
pp. 154-158 ◽  
Author(s):  
Bao Wei Hao ◽  
Yuan Li ◽  
Shi Zhao Wang
Keyword(s):  
Titanium Dioxide ◽  
Oleic Acid ◽  
Structural Characterization ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Nano Structure ◽  
Gel Method ◽  
Surface Modified ◽  
Nano Titanium Dioxide

oleic acid-modified nano-titanium dioxide were synthesized by Oleic acid and tetrabutyl titanate via the sol-gel method, and characterized by IR TEM TG-DT A and XPS. Comparison with the data of the IR, the combination of carboxyl is chelating with Ti atoms. Based on the analysis of IR, TG-DTA and XPS, this paper suggests a model about the oleic acid-modified titanium dioxide nano-structure, and to provide a basis for future applications.

scholarly journals Surface Modification of nTiO2/Ag Hybrid Nanoparticles Using Microwave-Assisted Polymerization in the Presence of Bis(2-hydroxyethyl) Terephthalate

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
P. A. De León-Martínez ◽  
F. Soriano-Corral ◽  
C. A. Ávila-Orta ◽  
P. González-Morones ◽  
E. Hernández-Hernández ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Surface Modification ◽  
Electron Diffraction ◽  
Thin Layer ◽  
Ag Nanoparticles ◽  
Hybrid Nanoparticles ◽  
Excellent Performance ◽  
Microwave Assisted ◽  
A Value ◽  
Surface Modified

Titanium dioxide doped silver (nTiO2/Ag) nanoparticles were surface-modified by microwave-assisted polymerization of 2-bis-(hydroxyethyl) terephthalate (BHET). The modified and unmodified nanoparticles were analyzed by FTIR, XRD, TGA, and TEM. A thin layer of grafted PET on the surface of the nanoparticles was observed and quantified by TGA giving a value of 40 wt-%. XRD and electron diffraction analyses showed traces of AgO2 after the modification. The bactericide activity of modified and unmodified nanoparticles was evaluated; the presence of the thin layer of grafted-PET on the nTiO2/Ag did not change significantly the bactericide activity, showing an excellent performance similar to unmodified nanoparticles.

Study on Flame Retardant and Anti-UV Finishing Technology of Cotton Knitted Fabric

2011 ◽  
Vol 694 ◽  
pp. 820-823 ◽  
Author(s):  
Jian Feng Di ◽  
Jie Xu ◽  
Wen Qin Du
Keyword(s):  
Titanium Dioxide ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Knitted Fabric ◽  
Nano Tio2 ◽  
Coating Agent ◽  
Coating Technique ◽  
Cotton Knitted Fabric ◽  
Nano Titanium Dioxide

The coating agent was prepared by adding nano-titanium dioxide(nano-Tio2) and flame retardant to solvent-based polyurethane(PU),then applied to cotton knitted fabric which was finished by padding flame retardant through transfer coating technique, so a multifunctional coating fabric with flame retardancy and anti-UV property was manufactured. Discussing the changes in flame retardancy and anti-UV property with the increase in addition of flame retardant and nano-titanium dioxide. The results showed that the fabric has good flame retardancy and anti-UV property.

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