scholarly journals Synthetic aspects and characterization of polypropylene–silica nanocomposites prepared via solid-state modification and sol–gel reactions

Polymer ◽  
2005 ◽  
Vol 46 (17) ◽  
pp. 6666-6681 ◽  
Author(s):  
Sachin Jain ◽  
Han Goossens ◽  
Francesco Picchioni ◽  
Pieter Magusin ◽  
Brahim Mezari ◽  
...  
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Silica Nanocomposites

Preparation and characterization of montmorillonite–silica nanocomposites: A sol–gel approach to modifying clay surfaces

2008 ◽  
Vol 403 (18) ◽  
pp. 3231-3238 ◽  
Author(s):  
Zhongzhong Qian ◽  
Guangjun Hu ◽  
Shimin Zhang ◽  
Mingshu Yang
Keyword(s):  
Sol Gel ◽  
Silica Nanocomposites

Investigation and characterization of radio frequency sputtered Cr1.8Ti0.2O3−δ thin films derived by citrate, sol–gel and solid state routes

2007 ◽  
Vol 515 (18) ◽  
pp. 7053-7058 ◽  
Author(s):  
Suman Pokhrel ◽  
Xinglin Li ◽  
Lihua Huo ◽  
Hui Zhao ◽  
Xiaoli Cheng
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Radio Frequency ◽  
Sol Gel

Luminescence characterization of sol-gel derived Pr3+ doped NaGd(WO4)2 phosphors for solid state lighting applications

2016 ◽  
Vol 179 ◽  
pp. 295-303 ◽  
Author(s):  
A. Durairajan ◽  
D. Thangaraju ◽  
S. Moorthy Babu ◽  
M.A. Valente
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Solid State Lighting

Synthesis of Pure Dicalcium Silicate Powder by the Pechini Method and Characterization of Hydrated Cement

2014 ◽  
Vol 787 ◽  
pp. 387-394 ◽  
Author(s):  
Yan Ni Tan ◽  
Yong Liu ◽  
Zhang Qing ◽  
Gurpreet Birdi ◽  
Liam M. Grover
Keyword(s):  
Solid State ◽  
Mass Loss ◽  
Solid State Reaction ◽  
Pechini Method ◽  
Sol Gel ◽  
Dicalcium Silicate ◽  
Hydrated Cement ◽  
Gel Method ◽  
Sol Gel Method

Calcium silicate (CS) is a main component of Portland cement and is responsible for the strength development. Recent research has shown that dicalcium silicate cement (CSC) is bioactive and is a potential candidate for bone replacement. Traditionally, dicalcium silicate powder is synthesized by a solid state reaction or a sol-gel method. The solid-state reaction, however, usually needs a higher temperature and a longer calcination time. Furthermore, the dicalcium silicate powder made by the sol-gel method is not pure, and contains a significant quantity of CaO which is harmful to the strength and biological properties of the CSC. The Pechini technique is an alternative, low temperature polymeric precursor route for synthesis of high purity powders. In this study, purer CS powder was synthesized via the Pechini method by calcination at 800°C for 3h. DSC-TGA, XRD, SEM were used for characterization of CS powder and the hydrated cement. The DSC-TGA curves showed that the main exothermic peak was at 479°C and the total mass loss was 79.2%. The XRD patterns of CSC after hydration for 7, 14, and 35 days illustrated that dicalcium silicate hydrate (Ca1.5SiO3.5·xH2O, C-S-H) was formed in the hardened CS paste. The XRD peaks on the diffraction pattern of the C-S-H of the day 35 sample were of greater intensity than those at day 7 and day 14. This demonstrates that the hydration speed was slow and complete hydration could take more than one month. Flake-like crystals were observed on scanning electron micrographs following hardening. The degradation study result showed that there was no mass loss of CSC after the samples were soaked into phosphate buffered saline (PBS) for 40 days. The silicon assay revealed that orthosilicic acid could be released from CSC after the samples were soaked in simulated body fluid (SBF). Silicon is known to be critical to skeletal mineralization. The existence of silicon may stimulate the proliferation of bone and activate cells to produce bone. Investigation of cell attachment confirmed that the MC-3T3 cells attached well to the surfaces of CSC after seeding.

The use of multinuclear solid state NMR for the characterization of siloxane-oxide hybrid nanocomposites

2004 ◽  
Vol 847 ◽  
Author(s):  
Christel Gervais ◽  
Beatriz Julián ◽  
Eloisa Cordoncillo ◽  
Purificación Escribano ◽  
Mark E. Smith ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Sol Gel Process ◽  
Hydrolysis And Condensation ◽  
Silicon Alkoxides ◽  
Different Types ◽  
Nmr Techniques

ABSTRACTThe objective of this paper is to review various solid state NMR techniques that have been, or can be used for the structural characterization of siloxane—oxide hybrid systems prepared by sol-gel process, and to discuss the type of information they provide, as well as their limitations. More precisely, this paper focuses on NMR techniques to probe and quantify the different types of oxo-bridges (M–O–M of oxide network, Si–O–Si of siloxane chains and Si–O–M siloxane–MxOy interface) in siloxane-oxide nanocomposites prepared through hydrolysis and condensation of organosilanes and M(OR)n alkoxides. In addition the influence of the functionality of the silicon alkoxides and the nature of the MxOy oxides on the extent of the Si-O-M interface will be examined.

The Preparation and Characterization of the Mesoporous Poly(bisphenol-A carbonate) – Silica Nanocomposites

2014 ◽  
Vol 513-517 ◽  
pp. 82-85
Author(s):  
Rui Rui Li ◽  
Yue Shi ◽  
Lei Zu ◽  
Hui Qin Lian ◽  
Yang Liu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Pore Diameter ◽  
Ph Value ◽  
Sol Gel ◽  
Synthesis System ◽  
Silica Nanocomposites

The mesoporous polycarbonate-silica nanocomposite materials were synthesized through the modified sol-gel approach under acidic condition. The specific surface area, pore diameter and pore volume of polycarbonate-silica could be controlled by changing the acidity of the synthesis system. The polycarbonate-silica possess an irregular block morphology according to the scanning electron microscopy observations. With decreasing the pH value of the synthesis system, the specific surface area and pore diameter of polycarbonate-silica were raised but the pore volume was reduced. The maximum specific surface area of polycarbonate-silica was 701.71m2/g which presented by the results of Nitrogen adsorptiondesorption isotherms.

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