Shao Yun Shan

Effect of Different Silicon Sources on CO2 Absorption Properties of Li4SiO4 at High Temperature

Using cheap and porous diatomite or zeolite as silicon sources, we prepared firstly Li4SiO4 matetials for high temperature CO2 capture through solid-state method, and mainly investigated effects of silicon sources on the CO2 absorption properties of Li4SiO4 materials. Phase composition was analyzed by X-ray diffraction, and the CO2 absorption properties were studied by the simultaneous thermal thermogravimetric analyzer (TG-DSC). The results showed that Li4SiO4 materials using zeolite as silicon source showed little CO2 absorption properties, while Li4SiO4 materials using diatomite as silicon source showed excellent CO2 absorption properties. Compared with the existing literatures, the preparation cost of Li4SiO4 materials was lowered

The Effects of Natural Dopant Acids on Morphologies and Antibacterial Activity of Polyaniline

Polyaniline(PANI) doped by natural acid(citric acid, salicylic acid or rosin acid)solutions was synthesized using aniline as monomer and ammonium peroxydisulfate ((NH4)2S2O8) as oxidant. The antibacterial activities of the PANI against Gram positive bacteria(Bacillus megatherium, Bacillus subtilis, Bacillus cereus and Staphylo-coccus aureus) and Gram negative bacteria(Bacillus coli) were investigated. It was shown that PANI doped by citric acid possessed the better antibacterial activity against the selected species of Gram positive bacteria and Gram negative bacteria than PANI doped by rosin acid. PANI doped by salicylic acid exhibited ascendant antibacterial activities against Gram positive bacteria, but it has little antibacterial activity against the Gram negative bacteria.

Process on Inorganic Nanomaterial Synthesis by Microwave-Hydrothermal Methods

The microwave-hydrothermal method is one of the methods preparing inorganic material. In this paper, the synthesis principle and application of microwave–hydrothermal technology in preparing nano-material were summarized. The application prospect of synthesizing inorganic material by microwave- hydrothermal method was prospected. The microwave- hydrothermal technology plays an important role in accelerating and optimizing the crystallization and nuclear of inorganic nano-material, which will provide a new way for inorganic material synthesis.

A Effects of Polyaniline Morphologies on Performance for Removal Rhodamine B

Polyaniline with different morphologies doped by nitric acid were prepared using rapid mixture method. Scanning electron microscopy analysis showed that morphologies of polyaniline can be changed from unequal particles to nanowires with increasing the molar ratio of aniline to ammonium peroxydisulfate. The adsorption of rhodamine B dye was carried out using the polyaniline with different morphologies, and the effect of morphologies was studied. The results proved that adsorption of rhodamine B from aqueous solutions using polyaniline is an effective and economical method, and morphologies of polyaniline obviously affect its adsorption performance. The polyaniline nanowires present the best adsorption performance for removal rhodamine B among polyaniline with the three kinds of morphologies.

Synthesis and Properties Epoxy Resin/Mesoporous Silica-Organic Clay Nanocomposites

A novel nanofiller containing layered organo-modifed montmorillonite (oM) and mesoporous silica micro-sphere (MS) was prepared by in situ deposition method, and the microstructures and morphologies of this nanofiller were characterized by Fourier transform infrared spectrometry (FTIR) X-ray diffraction (XRD) and transmission electronic microscopy (TEM). EP/oM-MS nanocomposite was obtained by adding oM-MS to EP matrix. Morphologies and mechanical of the new ternary nanocomposite were investigated. For purpose of comparison, the corresponding binary nanocomposites, i.e., EP modified with either oM or MS, were tested as well. The test results of mechanical properties show that oM obviously improves the strength of EP and MS enhances the toughness of EP, but oM-MS exhibits synergistic effect on toughening and reinforcing of EP.

Synthesis and Properties Epoxy Resin/Mesoporous Silica-Sepiolite Nanocomposites

Size, shape and processing of the inorganic fillers are important for improving properties of nanocomposites. In this paper, a novel nanofiller containing mesoporous silica(MS) and fibrous sepiolite(SE) was prepared by in situ deposition method. EP/MS-SE nanocomposite was obtained by adding MS-SE to epoxy resin(EP) matrix. Morphologies and mechanical properties of the new ternary nanocomposite were investigated. For purpose of comparison, the corresponding binary nanocomposites, i.e., EP modified with either MS or SE, were tested as well. The test results of mechanical properties show that MS improves the strength of EP and SE obviously enhances the toughness of EP, but oM-MS exhibits synergistic effect on toughening and reinforcing of EP at the same time. Dynamic mechanical analysis revealed that the glass transition temperature and storage modulus of the EP/MS-SE nanocomposite was higher than those of pure EP.

Preparation of Fibrous CaO Sorbent by Hydrothermal Method

Using urea and calcium chloride as precipitator and calcium source, fibrous CaCO3 precursors were prepared using hydrothermal method, then fibrous CaO sorbent was obtained by calcination. The influence of hydrothermal temperature on CO2 absorption properties was discussed. X-ray diffraction analysis showed that pure CaCO3 phase with aragonite and calcite crystal forms was obtained. Scanning electron microscopy analysis showed that the resultant CaO sorbent presented a fibrous microstructure, which inherited the morphologies of CaCO3. The absorption capacity of the resultant CaO sorbent reached 59.86%, being 76% of theoretical absorption capacity. In addition, compared with the CaO sorbent from analytical pure CaCO3, the obtained fibrous CaO-sorbent have the better cyclic absorption properties.

Electrochemical Synthesis of Polyaniline and its Anticorrosion Performance for X70 Steel

The effects of preparation conditions on the synthesis of polyaniline and its anticorrosion performance were investigated using single-factor method. The experimental results showed that the better conditions for electrochemical synthesis of polyaniline films are 0.5 M aniline, 0.8 M H2SO4, range of sweep voltage 1.6 V~-0.3V (Init =-0.3V), sensitivity 1.e-002, sweep segment 8, scan rate 0.1V/s. The anticorrosion performances of polyaniline films were investigated in 5% and 2.5% MgCl2 solutions respectively. Polarization and AC impedance technique tests proved that the polyaniline film owned a better anticorrosion performance to X70 in 2.5% MgCl2 solution than the denser one. And, it was found that polyaniline films adhered to X70 steel exhibited good barrier properties for a prolonged corrosion process. The above results provided some experimental data and theoretical guidance of polyaniline anticorrosion properties for some metals, especially for metals using in oil and natural gas industry.

One-Step Synthesis and Antibacterial Properties of Polyaniline/TiO2 Nanocomposites

Polyaniline(PANI)/TiO2 nanocomposites are successful synthesized by one step-interfacial polymerization method. Morphologies and structures of the nanocomposites are characterized using SEM, FTIR, and XRD. The antibacterial properties of PANI/TiO2 nanocomposites on Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Bacillus megateriu and Bacillus cereus are tested. The effect of molar ratio of aniline and tetrabutyl titanate on structures and antibacterial properties are also been explored. The results show that the content of tetrabutyl titanate has a obvious influence on structure and morphologies of the nanocomposites. PANI/TiO2 nanocomposites have antibacterial properties especially on Staphylococcus aureus and Escherichia coli, which shows a best antibacterial property when the molar ratio of aniline to tetrabutyl titanate is 3:2.

Interfacial Synthesis of SiO2 Doped by Polyaniline and its Electrorheological Behavior

SiO2 doped by polyaniline for application in electrorheological (ER) fluid was prepared by using a simple one-pot interfacial synthesis method. Scanning electron microscopy (SEM) image shows that the morphologies of SiO2 may be changed from spherical to fibroid structure by changing the molar ratio of tetraethyl orthosilicate(TEOS) and aniline. X-ray diffraction (XRD) proves that polyaniline does not change the crystallinity of SiO2. The ER behaviors of SiO2 doped by polyaniline in silicone oil are investigated with different doping degrees under different shear rate, and the results show that properly doping polyaniline improves electrorheological behavior of SiO2.