scholarly journals The Sol-Gel Process for Non-Metallic Inorganic Materials

1986 ◽  
pp. 49-56 ◽  
Author(s):  
H. Schmidt ◽  
H. Scholze
Keyword(s):  
Sol Gel ◽  
Inorganic Materials ◽  
Sol Gel Process

Synthesis and Second-Order Optical Nonlinearity of Inorganic-Organic Hybrid Films Bearing Y-Type NLO Active Chromophore

2007 ◽  
Vol 336-338 ◽  
pp. 552-554
Author(s):  
Xiao Nan Mei ◽  
Hai Yao Lin ◽  
Yuan Jing Cui ◽  
Ping Lv ◽  
Guo Dong Qian
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Optical Nonlinearity ◽  
Second Order ◽  
Inorganic Materials ◽  
Hybrid Films ◽  
Organic Hybrid ◽  
Type Silicon ◽  
Sol Gel Process ◽  
Organic Chromophore

In order to achieve a large hyperpolarizability (β) value and thermal stability, a novel Y-type silicon precursor ICTES-DBPNPI was synthesized. By the sol-gel process, the new organic-inorganic materials having organic chromophore were prepared.

scholarly journals Porosity in Polysilsesquioxane Xerogels

1999 ◽  
Vol 576 ◽  
Author(s):  
Brigitta M. Baugher ◽  
Duane A. Schneider ◽  
Douglas A. Loy ◽  
Kamyar Rahimian
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pore Structure ◽  
Convenient Method ◽  
Sol Gel ◽  
Monomer Concentration ◽  
Inorganic Materials ◽  
Sol Gel Process ◽  
Very High ◽  
Scanning Electron

ABSTRACTPolymerization of organotrialkoxysilanes is a convenient method for introducing organic functionality into hybrid organic-inorganic materials. However, not much is known about the effects of the organic substituent on the porosity of the resulting xerogels. In this study, we prepared a series of polysilsesquioxane xerogels from organotrialkoxysilanes, RSi(OR′)3, with different organic groups (R = H, Me, Et, dodecyl, hexadecyl, octadecyl, vinyl, chloromethyl, cyanoethyl). Polymerizations of the monomers were carried out under a variety of conditions, varying monomer concentration, type of catalyst, and alkoxide substituent. The effect of the organic substituent on the sol-gel process was often dramatic. In many cases, gels were formed only at very high monomer concentration and/or with only one type of catalyst. All of the gels were processed as xerogels and characterized by scanning electron microscopy and nitrogen sorption porosimetry to evaluate their pore structure.

scholarly journals Gel Based Sunscreen Containing Surface Modified TiO2Obtained by Sol-Gel Process: Proposal for a Transparent UV Inorganic Filter

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Marina Paiva Abuçafy ◽  
Eloísa Berbel Manaia ◽  
Renata Cristina Kiatkoski Kaminski ◽  
Victor Hugo Sarmento ◽  
Leila Aparecida Chiavacci
Keyword(s):  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Chemical Properties ◽  
High Refractive Index ◽  
Inorganic Materials ◽  
Continuous Exposure ◽  
Sol Gel Process ◽  
Surface Modified ◽  
Physical And Chemical ◽  
Gel Formulations

Inorganic UV filters, as titanium dioxide (TiO2), have become attractive because of their role in protecting the skin against the damage caused by the continuous exposure to the sun. However, their high refractive index, responsible for a white residue when applied on the skin, has led to the development of alternative inorganic materials, such as TiO2nanoparticles. Thus, the aim of this study was the development of transparent and stable gel formulations containing surface modified TiO2nanoparticles for application in sunscreens. Also, the physical and chemical properties of formulations containing TiO2nanoparticles were evaluated. The UV absorption spectroscopy analyses indicated that the formulations containing TiO2nanoparticles had a broad protection spectrum. The diffuse reflectance spectroscopy revealed that the use of PTSH surface modified TiO2nanoparticles improved the transparency of the sunscreen formulations compared to that containing commercial ones. The rheology analyses showed that the amount of nanoparticles incorporated in the formulations influences the gel-like or liquid-like behavior. The results showed that the surface modified TiO2nanoparticles are a promising innovative UV filter and the formulations containing these nanoparticles are interesting candidates for being used as sunscreen.

Organic–inorganic sol-gel thick films for humidity barriers

2008 ◽  
Vol 23 (8) ◽  
pp. 2084-2090 ◽  
Author(s):  
Andrei Jitianu ◽  
Glenn Amatucci ◽  
Lisa C. Klein
Keyword(s):  
Contact Angle ◽  
Thick Films ◽  
Sol Gel ◽  
Attenuated Total Reflection ◽  
Inorganic Materials ◽  
Angle Measurements ◽  
Glass Slides ◽  
Contact Angle Measurements ◽  
Sol Gel Process ◽  
Poly Ethylene

Hybrid thick films were deposited on Surlyn, a copolymer of poly(ethylene- co-methacrylic acid) and a common adhesion film for metal surfaces. Hybrid organic–inorganic materials were prepared by a sol-gel process. Methyltriethoxysilane (MTES) with tetraethoxysilane (TEOS), phenyltriethoxysilane (PhTES) with TEOS, and methyltrimethoxysilane (MTMS) with tetramethoxysilane (TMOS) were investigated. The inorganic component was selected to form the network for the film, while the organic component was selected to repel water and fill porosity. The films were deposited on Surlyn and on glass slides. The properties of the films were investigated using attenuated total reflection Fourier transform infrared (FTIR) and Raman spectroscopy. Contact-angle measurements indicated that the contact angle increased from ∼76.5° for Surlyn alone to ∼89.6° for Surlyn coated with MTES.

scholarly journals Nanolevel Finishing for Veneered Products

2015 ◽  
Vol 1 ◽  
pp. 56 ◽  
Author(s):  
Edgars Kirilovs ◽  
Laura Krūklīte ◽  
Silvija Kukle ◽  
Zane Zelča
Keyword(s):  
Color Change ◽  
Sol Gel ◽  
Industrial Process ◽  
Inorganic Materials ◽  
Wood Veneer ◽  
Interior Decoration ◽  
Protective Properties ◽  
Sol Gel Process ◽  
Coating Type ◽  
Residential Projects

<p class="R-AbstractKeywords"><span lang="EN-US">Wood veneer is mainly used for interior decoration applications in many different segments. It's ideal for residential projects, hotel projects, offices giving to the any interior a unique look and feel.  In addition, veneer is also processed to create a variety of products such as veneer parquet, flexible veneer sheets, wood veneer boards, wood veneer wallpaper, etc. From the other side, veneered surfaces will always to a greater or lesser degree could change color, particular upon exposure to natural and artificial light. The degree of color change will depend on such factors as the species chosen, the coating type used and intensity and period of the exposure to light. In addition, conventional finishes have a tendency to yellow with age which can have quite dramatic effects on the original color of the selected timber. To minimize these effects new finishes have to be developed. In the paper new, unvisible nanolevel coating for veneer finish based on the sol-gel process is offered. It is known that the sol–gel technique is an established industrial process for the generation of colloidal nanoparticles from liquid phase, which has been further developed in last years for the production of advanced coatings. It is well adapted for oxide nanoparticles and composites synthesis. The main advantages of sol-gel techniques are comparable low processing temperatures offering unique opportunities for access to organic and inorganic materials. The sol synthesis and application technology as well protective properties of coating will be discussed. </span></p>

Characterization of Medium-range Order in Self-Assembled Organic-inorganic Hybrid by Fluctuation X-ray Microscopy

2006 ◽  
Vol 960 ◽  
Author(s):  
Lixin Fan ◽  
David Paterson ◽  
Ian McNulty ◽  
M. M. J. Treacy ◽  
Dushyant Kumar ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Range Order ◽  
Inorganic Materials ◽  
Medium Range Order ◽  
X Ray ◽  
Sol Gel Process ◽  
Medium Range ◽  
Self Assembled

ABSTRACTThe control of formation and ordering of self assembled nanostructures, with medium- to long-range order, is a challenge that limits advances in many fields of nanotechnology. We have developed a technique, which we call fluctuation x-ray microscopy, that offers quantitative insight into medium-range correlations in disordered materials at nanometer- and larger-length scales. We examined the influence of sol-gel process variables on medium range order in PI-b-PEO/ aluminosilicate bulk using this technique. The nano-structuring of inorganic materials was directed by polymer self-assembly. The medium range correlation between the nanostructures in two hybrids was quantitatively examined and compared.

Molecular Relaxations in Hybrid Organic-Inorganic Materials Prepared by a Sol-Gel Process

1997 ◽  
Vol 8 (3) ◽  
pp. 101-108 ◽  
Author(s):  
H. Kaddami ◽  
F. Vincens ◽  
G. Boiteux ◽  
J. F. Gérard ◽  
G. Seytre ◽  
...  
Keyword(s):  
Sol Gel ◽  
Inorganic Materials ◽  
Sol Gel Process

Nanoparticles Prepared by Sol-Gel Method Used in Pseudoboehmite-Reinforced Nylon 6.12 Nanocomposites

2014 ◽  
Vol 798-799 ◽  
pp. 732-736
Author(s):  
Renato Meneghetti Peres ◽  
C.Y.U. Peres ◽  
Leila F. de Miranda ◽  
Cesar Denuzzo ◽  
Gabriel Cavalcante Gomes ◽  
...  
Keyword(s):  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Mechanical Tests ◽  
High Specific Surface Area ◽  
Polymeric Matrix ◽  
Inorganic Materials ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Sol Gel Process

Polymers nanocomposites are composed by nanometrical particles embedded in a specific matrix. Additions of small amount of nanoparticles of inorganic material in specific matrixes can greatly improve mechanical properties. The high specific surface area of the inorganic materials nanoparticles promotes its dispersion in the polymeric matrix, and the obtained properties are strongly related to the homogeneity of the dispersion. In the present work, nylon 6.12 nanocomposites with different concentrations of pseudoboehmite obtained by sol-gel process were prepared with different concentrations of octadecylamine. The pseudoboehmite was characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis and thermo gravimetric analysis. The nanocomposites were characterized by thermal and mechanical tests. The addition of pseudoboehmite reduces the melting flow, evidencing the interaction of pseudoboehmite with the polymeric matrix probably modifying its crystalline structure.

Sign in / Sign up

Export Citation Format

Share Document