Amine-modified silica surface applied as adsorbent in the phenol adsorption assisted by ultrasound

2019 ◽  
Vol 206 (11) ◽  
pp. 1554-1569 ◽  
Author(s):  
Marília R. Oliveira ◽  
Matheus M. Oliveira ◽  
Ronney J. Oliveira ◽  
Adriana Dervanoski ◽  
Elton Franceschi ◽  
...  
Keyword(s):  
Silica Surface ◽  
Modified Silica ◽  
Phenol Adsorption

Ion sorption on modified silica surface

1990 ◽  
Vol 140 (1) ◽  
pp. 114-122 ◽  
Author(s):  
Gennadii V Kudryavtsev ◽  
Dmitrii V Miltchenko ◽  
Vladimir V Yagov ◽  
Alexei A Lopatkin
Keyword(s):  
Silica Surface ◽  
Modified Silica ◽  
Ion Sorption

Mixing and Comparative Properties of NR Compounds Filled with Different Types of Reinforcing Fillers

2017 ◽  
Vol 266 ◽  
pp. 172-176
Author(s):  
Pattarawadee Maijan ◽  
Nitinart Saetung ◽  
Wisut Kaewsakul
Keyword(s):  
Carbon Black ◽  
Silica Surface ◽  
High Viscosity ◽  
Cure Rate ◽  
Modified Silica ◽  
Reinforcing Fillers ◽  
Silane Coupling ◽  
Different Types ◽  
Cure Time

Mixing behaviors of the compounds filled with different reinforcing fillers were studied in correlation with compound and vulcanizate properties. Four filler systems were used including: 1) silica plus small amount of silane coupling agent; 2) carbon black; 3) pre-modified silica; and 4) silica+silane-carbon black mixed one. The results have shown that silica provides longer optimum cure time and shorter cure rate than carbon black due to accelerator adsorption on silica surface. In addition, owing to highly polar nature on silica surface the silica-based compounds show rather high viscosity, attributed to stronger filler-filler interaction as can be confirmed by Payne effect and reinforcement index. However, the commercial surface treatment or pre-modified form of silica shows superior properties than in-situ modification of silica by silane during mixing, while it gives comparable properties to carbon black-based compound. Tensile properties of vulcanizates show a good correlation with the basic properties of their compounds.

Ag+-sensitive ISFET with a chemically modified silica surface

1994 ◽  
Vol 295 (3) ◽  
pp. 283-286 ◽  
Author(s):  
A. Bouazizi ◽  
H. Maaref ◽  
N. Jaffrezic-Renault
Keyword(s):  
Silica Surface ◽  
Modified Silica ◽  
Chemically Modified ◽  
Chemically Modified Silica

Preparation of Imprinted Polymer with D-Phenylalanin on Silica Surface

2009 ◽  
Vol 419-420 ◽  
pp. 541-544
Author(s):  
Hong Xing Dong ◽  
Qiu Li Jiang ◽  
Fei Tong ◽  
Zhen Xing Wang ◽  
Jin Yong Tang
Keyword(s):  
Silica Gel ◽  
High Performance ◽  
Silica Surface ◽  
Solid Phase ◽  
Adsorption Property ◽  
Research Field ◽  
Imprinted Polymer ◽  
Modified Silica ◽  
Modified Silica Gel ◽  
Functional Monomers

Silica gel was modified with polymerizable double bonds on the surface. Then the molecular imprinting polymer imprinted with D-Phenylalanin was grafted on the surface of modified silica gel. The molecularly imprinted polymer (MIP) based on the surface of silica gel was characterized by IR and scanning electron microscopy (SEM). The adsorption property of D-Phenylalanin by MIP was mearsured. The MIP with the combined functional monomers exhibited better adsorption properties and selectivity compared with the corresponding non-imprinted polymers or MIP with the single functional monomer. The material could be used in separation research field, such as packing material of high performance liquid chromatography, solid-phase extraction and so on.

The structure of modifying layers and identification of residual hydrophilic groups on modified silica surface by the adsorption and chromatographic measurements

2007 ◽  
Vol 69 (2) ◽  
pp. 221-226 ◽  
Author(s):  
Yu. I. Tarasevich ◽  
S. V. Bondarenko ◽  
A. I. Zhukova ◽  
Z. G. Ivanova
Keyword(s):  
Silica Surface ◽  
Modified Silica

scholarly journals Surface Modification of Fumed Silica by Plasma Polymerization of Acetylene for PP/POE Blends Dielectric Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1957 ◽  
Author(s):  
Xiaozhen He ◽  
Ilkka Rytöluoto ◽  
Rafal Anyszka ◽  
Amirhossein Mahtabani ◽  
Eetta Saarimäki ◽  
...  
Keyword(s):  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Plasma Polymerization ◽  
Silica Surface ◽  
Plasma Reactor ◽  
Charge Trapping ◽  
Plasma Modification ◽  
Modified Silica ◽  
Depolarization Current ◽  
X Ray

Novel nanocomposites for dielectric applications-based polypropylene/poly(ethylene-co-octene) (PP/POE) blends filled with nano silica are developed in the framework of the European ‘GRIDABLE’ project. A tailor-made low-pressure-plasma reactor was applied in this study for an organic surface modification of silica. Acetylene gas was used as the monomer for plasma polymerization in order to deposit a hydrocarbon layer onto the silica surface. The aim of this modification is to increase the compatibility between silica and the PP/POE blends matrix in order to improve the dispersion of the filler in the polymer matrix and to suppress the space charge accumulation by altering the charge trapping properties of these silica/PP/POE blends composites. The conditions for the deposition of the acetylene plasma-polymer onto the silica surface were optimized by analyzing the modification in terms of weight loss by thermogravimetry (TGA). X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray fluorescence spectroscopy (EDX) measurements confirmed the presence of hydrocarbon compounds on the silica surface after plasma modification. The acetylene plasma modified silica with the highest deposition level was selected to be incorporated into the PP/POE blends matrix. X-ray diffraction (XRD) showed that there is no new crystal phase formation in the PP/POE blends nanocomposites after addition of the acetylene plasma modified silica. Differential scanning calorimetry results (DSC) show two melting peaks and two crystallization peaks of the PP/POE blends nanocomposites corresponding to the PP and POE domains. The improved dispersion of the silica after acetylene plasma modification in the PP/POE blends matrix was shown by means of SEM–EDX mapping. Thermally stimulated depolarization current (TSDC) measurements confirm that addition of the acetylene plasma modified silica affects the charge trapping density and decreases the amount of injected charges into PP/POE blends nanocomposites. This work shows that acetylene plasma modification of the silica surface is a promising route to tune charge trapping properties of PP/POE blend-based nanocomposites.

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