Impact of nano-TiO2 addition on the reduction of net CO2 emissions of cement pastes after CO2 curing

Abstract The study emphasized the sintering behaviour and tribo-mechanical properties of alumina ceramics by nano TiO2 addition as a sintering aid. With increase in sintering temperature, the bulk density of alumina has increased gradually and optimized at 1600°C. The optimizing effect of densification at 1600°C is 98.25% by the addition of 1 wt.% nano TiO2. The maximum solid solubility of titania in alumina grains was at 1600°C, causes optimisation of densification by 1 wt. % addition. The excess addition of TiO2 formed low dense Al2TiO5, appear as a secondary phase at grain boundaries and does not significantly improved densification. Fracture toughness increases and coefficient of friction decreases with the addition of nano TiO2 in alumina matrix. The 1wt.% nano TiO2 addition improved hardness to 8.82% and reduces specific wear rate to 45.56%. The 1wt.% nano TiO2 addition greatly influenced the microstructure of sintered Al2O3. The morphology was sharply changed from hexagonal columnar shape to order sub round orientation which also directly impact the tribo-mechanical properties of sintered alumina. The 1wt.% addition substantially decreases wear track depth as observed by 3D surface profilometer. Microscopic observation of the worn-out surface showed that wearing is majorly caused by plastic deformation and abrasion.

Download Full-text

SINTERING BEHAVIOUR OF MAGNESIUM OXIDE OBTAINED FROM SEAWATER DOPED WITH NANO-TiO2

Materiali in tehnologije ◽

10.17222/mit.2019.248 ◽

2021 ◽

Vol 55 (5) ◽

Author(s):

Jelena Jakić ◽

Miroslav Labor ◽

Vanja Martinac ◽

Martina Perić

Keyword(s):

Positive Impact ◽

Microstructural Properties ◽

Secondary Phases ◽

Nano Tio2 ◽

Homogeneous Microstructure ◽

Optimal Amount ◽

Eds Analysis ◽

Tio2 Addition ◽

Sintering Behaviour ◽

Boundary Surfaces

In order to improve the properties of sintered MgO (80 % precipitation) obtained from seawater, an investigation was carried out with (0, 1, 2) w/% of nano-TiO2 and micro-TiO2 additions during sintering at a temperature of 1500 °C (1 h and 2 h). The effects of the TiO2 addition on its microstructural properties, density, porosity and chemical composition after sintering were observed. The SEM/EDS analysis confirmed the formation of a homogeneous microstructure composed mainly of periclase grains and well-distributed secondary phases. CaTiO3 and MgTiO4 are predominantly located at the inter- and intra-periclase grain boundary surfaces during cooling. The microstructure of the MgO samples with the addition of nano-TiO2 become more compact, having a positive impact on the porosity and density of the samples. The addition of 1 w/% of nTiO2 represents the optimal amount for the improvement of the properties of the MgO samples (80 % precipitation) obtained from seawater.

Download Full-text

Flexural and impact properties of flax fibre reinforced epoxy composite with nano TiO2 addition

Materials Today Proceedings ◽

10.1016/j.matpr.2018.10.285 ◽

2018 ◽

Vol 5 (11) ◽

pp. 24862-24870 ◽

Cited By ~ 6

Author(s):

Vishnu Prasad ◽

M.A. Joseph ◽

K. Sekar ◽

Mubarak Ali

Keyword(s):

Epoxy Composite ◽

Flax Fibre ◽

Nano Tio2 ◽

Impact Properties ◽

Tio2 Addition

Download Full-text

Effect of nano-TiO2 addition on microstructural evolution of small solder joints

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-016-4533-2 ◽

2016 ◽

Vol 27 (6) ◽

pp. 6076-6087 ◽

Cited By ~ 7

Author(s):

Z. L. Li ◽

G. Y. Li ◽

L. X. Cheng ◽

J. H. Huang

Keyword(s):

Microstructural Evolution ◽

Solder Joints ◽

Nano Tio2 ◽

Tio2 Addition

Download Full-text

An Important Factor Affecting the UV Aging Resistance of PBO Fiber Foped with Nano-TiO2: The Number of Amorphous Regions

Polymers ◽

10.3390/polym11050869 ◽

2019 ◽

Vol 11 (5) ◽

pp. 869

Author(s):

Jiping Liu ◽

Xiaobo Liu ◽

Dong Wang ◽

Hu Wang

Keyword(s):

Thermal Decomposition ◽

Wet Spinning ◽

Nano Tio2 ◽

Uv Aging ◽

Tio2 Particles ◽

Aging Resistance ◽

Pbo Fiber ◽

Tio2 Addition ◽

Resistance Performance ◽

Derivative Thermogravimetry

Modified nano-TiO2 was prepared by using triethanolamine and tetraisopropyl di (dioctylphosphate) titanate, respectively. Then the poly(p-phenylene benzobisoxazole) (PBO) fibers doped with different additions of modified nano-TiO2 particles were prepared by preparing PBO polymer solution and dry-jet wet spinning technique. Thermogravimetric and derivative thermogravimetry results showed that the addition of nano-TiO2 could improve the crystallinity and maximum thermal decomposition rate temperature of PBO fibers. Tensile strength results showed that nano-TiO2 addition did not affect the tensile properties of PBO fibers before ultraviolet (UV) aging began, and nano-TiO2 with addition values lower than 3% could improve the UV aging resistance performance of PBO fibers, while the aging resistance would be seriously reduced if values were over 5%. The size and quantity of the amorphous regions have a more important influence on the aging resistance of PBO fibers.

Download Full-text