Bismuth titanate nanoparticles dispersed polyacrylates

We successfully dispersed amorphous bismuth titanate nanoparticles (<50 nm)in situ in poly-hydroxy ethyl methacrylate via a sol-gel process. Since less than 20% of the polymer composition is bismuth titanate by weight, the material exhibits high refractive indices (>1.6) and good optical transparency (>90% transmittance from 530 to 800 nm). Furthermore, this highly cross-linked material has an improved thermal stability and a lower coefficient of thermal expansion than that of neat polymers. The material also displays a high dielectric constant (>10) without ferroelectricity. Thus the material has potential applications in optical lenses, optical waveguides, and capacitors.

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DIELECTRIC AND FERROELECTRIC BEHAVIORS OF NOVEL PbTiO3/NiFe2O4 THIN FILMS PREPARED BY SOL–GEL METHOD

Surface Review and Letters ◽

10.1142/s0218625x08010865 ◽

2008 ◽

Vol 15 (01n02) ◽

pp. 7-11 ◽

Cited By ~ 7

Author(s):

YANLING DONG ◽

XIN WANG ◽

XIAOYAN CHAI ◽

WENJIAN WENG ◽

GAORONG HAN ◽

...

Keyword(s):

Thin Films ◽

Remanent Polarization ◽

Sol Gel ◽

Hysteresis Loops ◽

Leak Current ◽

Composite Thin Films ◽

Sol Gel Process ◽

Percolation Effect ◽

High Dielectric

Ferroelectric/ferromagnetic (ME) biphase composite thin films with the type of (1–x) PbTiO 3( PT )–x NiFe 2 O 4 (NFO) (x = 1–9) were successfully formed in situ by sol–gel process. The dielectric and ferroelectric behaviors of the composite thin films were investigated. The asymmetrical hysteresis loops of the composite arise from the leak current due to low resistivity of NFO. The stronger stress in the thin films due to the strong conjunction between PT and the substrate contributes to the increase (decrease) of the coercive force (the remanent polarization) with increasing the content of PT. The ME composites exhibit slight percolation effect. The high dielectric constant near the percolation threshold is attributed to the "micro-capacitors" in the composite thin films.

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Synthesis and Intermolecularly Mediated Assembly of Organic Pigment in Hybrid Coating Films

MRS Proceedings ◽

10.1557/proc-519-103 ◽

1998 ◽

Vol 519 ◽

Author(s):

Y. Yan ◽

Z. Duan ◽

D.-G. Chen ◽

S. Ray Chaudhuri

Keyword(s):

Sol Gel ◽

Hybrid Coating ◽

Hypsochromic Shift ◽

Hybrid Films ◽

Coating Films ◽

Organic Pigment ◽

Inorganic Hybrid ◽

Matrix Interactions ◽

Sol Gel Process

AbstractThe insoluble, strongly hydrogen bonded organic pigment of 3,6-bis-(4-chlorphenyl)-l,4- diketopyrrolo [3,4-c] pyrrole was transiently blocked by adding carbamate groups, and consequently incorporated into organic-inorganic hybrid matrices by a sol-gel process. The homo- (pigment-pigment) and hetero-intermolecular (pigment-matrix) interactions were found to control both the assembly and dispersion of pigment molecules in the hybrid coating films. A weaker interaction between matrices and pigment molecules results in aggregation of the carbamate pigment in the methyl-silicate films. A stronger interaction forms a homogenous dispersion and coloration of the phenyl-silicate films. The as-prepared methyl- and phenylsilicate films doped with the organic pigment were distinguished by a morphology change and a blue (hypsochromic) shift in absorption from 550 to 460 nm. Thermal treatment can remove the carbamate groups and in-situ form the organic pigment in the hybrid films.

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Very low loss tangent, high dielectric and non-ohmic properties of Ca1−1.5xPrxCu3Ti4O12 ceramics prepared by the sol–gel process

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-017-7850-1 ◽

2017 ◽

Vol 28 (24) ◽

pp. 18966-18976 ◽

Cited By ~ 10

Author(s):

Ekaphan Swatsitang ◽

Thanin Putjuso

Keyword(s):

Loss Tangent ◽

Sol Gel ◽

Low Loss ◽

Sol Gel Process ◽

High Dielectric

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Sol-Gel derived Bi4-xNdxTi3O12 Thin Films and Their Characterization

MRS Proceedings ◽

10.1557/proc-737-f3.35 ◽

2002 ◽

Vol 737 ◽

Author(s):

R.E. Melgarejo ◽

M.S. Tomar ◽

A. Hidalgo ◽

R.S. Katiyar

Keyword(s):

Thin Films ◽

Spin Coating ◽

Bismuth Titanate ◽

Sol Gel ◽

X Ray Diffraction ◽

X Ray ◽

Complete Solid Solution ◽

Sol Gel Process ◽

Ferroelectric Memory ◽

Initial Results

ABSTRACTNd substituted bismuth titanate Bi4-xNdxTi3O12 were synthesized by sol-gel process and thin films were deposited on Pt substrate (Pt/TiO2/SiO2/Si) by spin coating. Thin films, characterized by X-ray diffraction and Raman spectroscopy, shows complete solid solution up to the composition x < 1. Initial results indicate that the ferroelectric polarization increases with increasing Nd content in the film with 2Pr = 50μC/cm2 for x = 0.46, which may have application in non-volatile ferroelectric memory devices.

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Fabrication of sulfonated poly(ether ether ketone)-based hybrid proton-conducting membranes containing carboxyl or amino acid-functionalized titania by in situ sol–gel process

Journal of Power Sources ◽

10.1016/j.jpowsour.2014.11.132 ◽

2015 ◽

Vol 276 ◽

pp. 271-278 ◽

Cited By ~ 50

Author(s):

Yongheng Yin ◽

Tao Xu ◽

Guangwei He ◽

Zhongyi Jiang ◽

Hong Wu

Keyword(s):

Amino Acid ◽

Sol Gel ◽

Proton Conducting ◽

Ether Ether Ketone ◽

Poly Ether Ether Ketone ◽

Sol Gel Process ◽

Ether Ketone ◽

Conducting Membranes ◽

Sulfonated Poly

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Preparation of the polymerizable titania oriented to 3D printing and the laser-induced crystallization

Rapid Prototyping Journal ◽

10.1108/rpj-03-2017-0041 ◽

2018 ◽

Vol 24 (9) ◽

pp. 1421-1427 ◽

Cited By ~ 2

Author(s):

Feng Liu ◽

Shaoai Xie ◽

Yan Wang ◽

Jianjun Yu ◽

Qinghua Meng

Keyword(s):

3D Printing ◽

Sol Gel ◽

Crystal Form ◽

Tetrabutyl Titanate ◽

Content Type ◽

Functional Additives ◽

Sol Gel Process ◽

Photosensitive Resin ◽

Induced Crystallization

PurposeThe titania (titanium dioxide) is one of the important functional additives in the photosensitive resin and encounters the problem of stabilization in the photosensitive resin for 3D printing. This study aims to achieve enhancement in stabilization by preparation of the polymerizable titania andin situlaser-induced crystallization during 3D printing.Design/methodology/approachA type of polymerizable titania (AAEM@TiO2) was designed and prepared from tetrabutyl titanate (TBT) and 2-(acetoacetoxy)ethyl methacrylate (AAEM) via the sol–gel process, which was characterized by Fourier-transform infrared (FTIR) spectra, ultraviolet–visible (UV-Vis) spectra, surface bonding efficiency (SBE) and settling height (H). AAEM acted on both bonding to the titania and polymerization with the monomer in resin for stabilization. The polymerizable titania could be converted to the pigmented titania by means of laser-induced crystallization. The photosensitive resin was then formulated on the basis of optimization and used in a stereolithography apparatus (SLA) for 3D printing.FindingsThe stabilization effect of AAEM on TiO2was achieved and the mechanism of competition in the light-consuming reactions during photocuring was proposed. The ratio of nAAEM/nTBTin AAEM@TiO2, the concentration of AAEM@TiO2and photoinitiator (PI) used in the photosensitive resin were optimized. The anatase crystal form was indicated by X-ray diffraction (XRD) and clustering of nanocrystals was revealed by scanning electron microscopy (SEM) after SLA 3D printing.Originality/valueThis investigation provides a novel method of pigmentation by preparation of the polymerizable titania andin situlaser-induced crystallization for SLA 3D printing.

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