Surface Modification of Nano-SiO2 Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

2017 ◽  
Vol 2 (29) ◽  
pp. 9349-9354 ◽  
Author(s):  
Chunlong Huang ◽  
Dongmin Wang
Keyword(s):  
Surface Modification ◽  
Microwave Irradiation ◽  
Nano Sio2 ◽  
Sio2 Particles ◽  
Polycarboxylate Ether

scholarly journals Improving the Interfacial Bond Properties of the Carbon Fiber Coated with a Nano-SiO2 Particle in a Cement Paste Matrix

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Gwang-Hee Heo ◽  
Jong-Gun Park ◽  
Ki-Chang Song ◽  
Jong-Ho Park ◽  
Hyung-Min Jun ◽  
...  
Keyword(s):  
Surface Modification ◽  
Carbon Fiber ◽  
Cement Paste ◽  
Bond Properties ◽  
Interfacial Bond ◽  
Sio2 Particle ◽  
Nano Sio2 ◽  
Pull Out ◽  
Modification Method ◽  
Sio2 Particles

To improve the interfacial bond properties of the carbon fiber coated with a nano-SiO2 particle in a cement paste matrix, the present study proposed a method of coating nano-SiO2 particles on the surface of the carbon fiber by the chemical reaction of a silane coupling agent (glycidoxypropyltrimethoxysilane, GPTMS) and colloidal nano-SiO2 sol in an alkaline environment. To verify whether a nano-SiO2 particle was effectively modified on the surface of the carbon fiber, the surface morphology, chemical composition, and chemical structure were characterized and analyzed by several techniques such as the scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), and Fourier-transform infrared spectroscopy (FT-IR). Nano-SiO2 particles were entirely covered and uniformly distributed on the surface of the carbon fiber, resulting in the formation of a thin layer of nano-SiO2 particles. A thin layer of nano-SiO2 particles reacted with Ca(OH)2 to form a calcium-silicate-hydrate (C-S-H) gel, which is most helpful to increase the form between the fiber and the matrix. In addition, a pull-out test of the tow carbon fibers was performed to verify the effect of the new surface modification method on the interfacial bond properties of the carbon fiber embedded in the cement paste matrix. The experimental results showed that the frictional bond strength of the carbon fiber coated with a nano-SiO2 particle was significantly increased compared to the plain carbon fiber. These results were expected to improve the interfacial bonding force of hardened cement paste from the formation of the C-S-H gel produced through the chemical reaction of nano-SiO2 particles coated on the surface of the carbon fiber with Ca(OH)2. In particular, it was confirmed that the carbon fiber-reinforced cement paste (CFRCP) specimens coated with a nano-SiO2 particle and silica fume which replaced 10 wt.% of cement by mass showed the highest pull-out resistance performance at 28 days of age. The new surface modification method developed in this study can be very beneficial and helpful in improving the interfacial bond properties of CFRCP.

Surface modification of nano-SiO2 particles using polyaniline

2005 ◽  
Vol 197 (1) ◽  
pp. 56-60 ◽  
Author(s):  
Xingwei Li ◽  
Gengchao Wang ◽  
Xiaoxuan Li
Keyword(s):  
Surface Modification ◽  
Nano Sio2 ◽  
Sio2 Particles

Silk degumming using microwave irradiation as an environmentally friendly surface modification method

2010 ◽  
Vol 11 (2) ◽  
pp. 234-240 ◽  
Author(s):  
Niyaz Mohammad Mahmoodi ◽  
Fereshteh Moghimi ◽  
Mokhtar Arami ◽  
Firoozmehr Mazaheri
Keyword(s):  
Surface Modification ◽  
Microwave Irradiation ◽  
Environmentally Friendly ◽  
Modification Method

ChemInform Abstract: An Efficient, Simple, and Scaleable Domino Reaction to Diverse N-(1-Oxo-1H-inden-2-yl)benzamides Catalyzed by HPW@nano-SiO2 under Microwave Irradiation.

ChemInform ◽  
2011 ◽  
Vol 42 (51) ◽  
pp. no-no
Author(s):  
Mahboubeh Rostami ◽  
Ahmad R. Khosropour ◽  
Valiollah Mirkhani ◽  
Iraj Mohammadpoor-Baltork ◽  
Majid Moghadam ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Domino Reaction ◽  
Nano Sio2

Largely improved toughness of PP/EPDM blends by adding nano-SiO2 particles

Polymer ◽  
2007 ◽  
Vol 48 (3) ◽  
pp. 860-869 ◽  
Author(s):  
Hong Yang ◽  
Xiaoqing Zhang ◽  
Cheng Qu ◽  
Bo Li ◽  
Lijuan Zhang ◽  
...  
Keyword(s):  
Nano Sio2 ◽  
Sio2 Particles

Double Sealing of Ultrasonic Micro-Arc Oxidation Coating on Pure Magnesium by Nano-SiO2 Particles and SiO2 Sol Sealing Agent

2014 ◽  
Vol 1030-1032 ◽  
pp. 48-51
Author(s):  
Wei Wei Sun ◽  
Mu Qin Li ◽  
Yan Gao ◽  
Jiang Liu
Keyword(s):  
Corrosion Resistance ◽  
Bone Growth ◽  
Corrosion Current ◽  
Pure Magnesium ◽  
Infrared Spectrometry ◽  
Nano Sio2 ◽  
Micro Arc Oxidation ◽  
Sio2 Particles ◽  
Si Content ◽  
Sealing Coating

A double sealing coating was prepared on ultrasonic micro-arc oxidized pure magnesium substrate by adding nano-SiO2 particles as additive in the plating solution and coating SiO2 sol as sealing agent. The bonding characters of SiO2 sol was analyzed by Fourier transformed infrared spectrometry (FTIR). The compositions and morphology of seal coating were characterized by energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM), respectively. The corrosion resistance of the micro-arc oxidized and the sealed pure magnesium substrate were studied. The results showed that the Si content increased gradually with the addition of nano-SiO2 particles and the SiO2 sol sealing. It was benefit to create bioactive MgSiO3, which promoted the bone growth. The double sealed pure magnesium had a self-corrosion potential shifted positively by 60mV as well as a self-corrosion current density decreased by a half in a 3.5wt% NaCl solution, showing good corrosion resistance.

Performance of Cement Systems with Nano-SiO2 Particles Produced by Using the Sol–Gel Method

2010 ◽  
Vol 2141 (1) ◽  
pp. 10-14 ◽  
Author(s):  
I. Flores ◽  
K. Sobolev ◽  
L. M. Torres-Martinez ◽  
E. L. Cuellar ◽  
P. L. Valdez ◽  
...  
Keyword(s):  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Nano Sio2 ◽  
Sio2 Particles
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