Preformed polymers for Langmuir—Blodgett films

1990 ◽  
Vol 330 (1610) ◽  
pp. 153-166 ◽  
Keyword(s):  
Second Harmonic ◽  
Layer Structure ◽  
Polymeric Films ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
X Ray Scattering ◽  
Electro Optic ◽  
Langmuir Blodgett Films ◽  
Simple Molecules ◽  
Derivatives Of

Langmuir-Blodgett (LB) films of simple molecules are usually fragile and this has prompted the study of polymeric lb films. Films have been prepared successfully from preformed polymers that are derivatives of various vinyl-maleic anhydride alternating copolymers. By using a computer-controlled trough polymeric films containing several hundred layers have been prepared. Low-angle X-ray scattering studies indicate that the films have a regular layer structure. By using a specially constructed trough, multilayers have been prepared in which alternate layers are polymeric, LB films prepared from polymers containing appropriate vinyl groups can be crosslinked by ultraviolet light or an electron beam (EB). This not only further stabilizes the films and renders them insoluble, but also allows patterns to be ‘ drawn ’ in the films. Films of these polymers have been used as submicrometre EB resists. Films suitable for second harmonic generation and electro-optic modulation have been prepared. Some further applications of polymeric LB films are outlined.

SECOND ORDER NONLINEAR OPTICAL PROPERTIES OF LANGMUIR–BLODGETT FILMS CONSISTING OF NON-AMPHIPHILIC POLAR MOLECULES

2004 ◽  
Vol 13 (03n04) ◽  
pp. 355-358 ◽  
Author(s):  
JUN KAWAMATA ◽  
SHOICHIRO HIRAKAWA ◽  
SEIJI TANI ◽  
YUICHIRO OGATA ◽  
AKIHIKO YAMAGISHI
Keyword(s):  
Optical Properties ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Single Layer ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Langmuir Blodgett Films

We have prepared hybrid Langmuir–Blodgett (LB) films consisting of a clay single layer and a non-amphiphilic polar molecule, 2,5-bis(p-dimethylaminocinnamylidene)-cyclopentanone. LB films deposited on solid substrates were characterized by means of UV-vis absorption spectroscopy and optical second-harmonic generation (SHG) measurements.

Nonlinear Magneto-Optical Kerr Effect in Gd-Containing Langmuir-Blodgett Films

1998 ◽  
Vol 517 ◽  
Author(s):  
N.V. Didenko ◽  
A.A. Fedyanisn ◽  
G.B. Khomutov ◽  
T.V. Murzina ◽  
O.A. Aktsipetrov
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Rayleigh Scattering ◽  
Second Harmonic ◽  
Rare Earth Ions ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Magneto Optical Kerr Effect ◽  
Wave Induced

AbstractMagnetization induced second harmonic generation (MSHG) is observed in Gd-containing Langmuir-Blodgett (LB) films. The nonlinear optical studies reveal significant alterations in the second harmonic generation (SHG) intensity and in the polarization and phase of the second harmonic (SH) wave induced by application of DC magnetic field. The violation of polarization selection rules and the diffusenes of the MSHG intensity indicates the inhomogeneity of LB structure and the hyper-Rayleigh scattering mechanism of MSHG. The latter proofs the existence of 2D-islands of Gd ions in the structural unit of the LB films which is composed by monolayer of rare-earth ions compressed between two layers of stearic acid molecules.

Characterization of Pure and Mixed Langmuir and Langmuir-Blodgett Films of Some Fluorescent Naphthalimide Dyes

2009 ◽  
Vol 64 (7-8) ◽  
pp. 492-502 ◽  
Author(s):  
Natalia Bielejewska ◽  
Roland Stolarski ◽  
Danuta Bauman
Keyword(s):  
Fluorescence Spectra ◽  
Fluorescent Dyes ◽  
Additional Absorption ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Fluorescence Measurements ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Derivatives Of

AbstractLangmuir and Langmuir-Blodgett (LB) films formed of some fluorescent dyes, derivatives of 4-aminonaphthalimide, and their binary mixtures with the liquid crystal 4-heptyl-4’-cyanobiphenyl (7CB) have been studied. Surface pressure versus mean molecular area isotherms for Langmuir films have given information about the alignment of molecules in a monomolecular layer at the air/water interface. The absorption and fluorescence spectra of LB films have revealed the occurrence of aggregates among dye molecules. In the ground electronic state some fraction of aggregates of J-type have appeared, while in the excited state the excimers have been created. The latter statement has been confirmed by additional absorption and fluorescence measurements performed for dyes dissolved in 7CB and placed in sandwich cells of 10 μm in thickness.

Spectral properties of naphthalimide dyes mixed with 4-heptyl-4′-cyanobiphenyl (7CB) in Langmuir-Blodgett films

2010 ◽  
Vol 18 (2) ◽  
Author(s):  
N. Bielejewska ◽  
E. Chrzumnicka ◽  
R. Stolarski ◽  
D. Bauman
Keyword(s):  
Liquid Crystal ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Fluorescent Dyes ◽  
Solid Substrate ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Polarised Light ◽  
Langmuir Blodgett Films ◽  
Derivatives Of

AbstractLangmuir-Blodgett (LB) films formed of some fluorescent dyes, namely derivatives of 4-aminonaphthalimide, and their binary mixtures with the liquid crystal 4-heptyl-4′-cyanobiphenyl (7CB) have been studied. The electronic absorption and fluorescence spectra were recorded. On the basis of these spectra, the spectral properties of the dyes and the intermolecular interactions in ultrathin ordered films were determined. The conclusions about the tendency to the creation of aggregates by dye molecules in LB films have been drawn. The measurements of absorption by using linearly polarised light have allowed us to determine the arrangement of the dye and liquid crystal molecules on the air-solid substrate interface.

DOUBLE-LAYER ELECTROLUMINESCENT DEVICES BASED ON LANGMUIR-BLODGETT FILMS OF AMPHIPHILIC 8-AMINOQUINOLINE

2006 ◽  
Vol 05 (06) ◽  
pp. 703-707
Author(s):  
SUI-PING DENG ◽  
HUI ZHENG ◽  
JIAN-MING OUYANG
Keyword(s):  
Double Layer ◽  
Layer Structure ◽  
Lb Films ◽  
Electroluminescent Devices ◽  
Langmuir Blodgett ◽  
Double Layer Structure ◽  
Organic Electroluminescent ◽  
Langmuir Blodgett Films

Organic electroluminescent (EL) devices with a double-layer structure, ITO/H 2 A/Alq 3/ Al , were fabricated from powder and 15-layer LB films of a new amphiphilic 8-aminoquinoline ligand, N , N -bis(8-quinolinyl)hexadecyl propanediamide ( H 2 A ), respectively. Their driving voltages were 6.5 and 7.5 V, highest luminances 60 and 28.4 cd/m2.

Nanoparticle assembly following Langmuir–Hinshelwood kinetics on a Langmuir film and chain networks captured in LB films

2015 ◽  
Vol 17 (11) ◽  
pp. 7386-7394 ◽  
Author(s):  
Lasya Maganti ◽  
Madhuri Jash ◽  
Anju Nair ◽  
T. P. Radhakrishnan
Keyword(s):  
Metal Nanoparticles ◽  
Nanoparticle Assembly ◽  
Deposition Pressure ◽  
Langmuir Film ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Positively Charged

Negatively charged metal nanoparticles assemble as chain networks through Langmuir–Hinshelwood kinetics on a Langmuir film of positively charged amphiphiles. The extension of the networks captured in Langmuir–Blodgett films is tuned by the deposition pressure.

Effect of subphase divalent ions on optical second harmonic properties of hemicyanine Langmuir-Blodgett films interleaved with compatible spacer

2005 ◽  
Vol 476 (1) ◽  
pp. 152-156 ◽  
Author(s):  
Kui Han ◽  
Qun Wang ◽  
Gang Tang ◽  
Haipeng Li ◽  
Xiaopeng Sheng ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Divalent Ions ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Second Harmonic Generation in Langmuir-Blodgett Films of N-Docosyl-4-Nitroaniline

1991 ◽  
pp. 157-166
Author(s):  
T. Geisler ◽  
S. Rosenkilde ◽  
W. M. K. P. Wijekoon ◽  
P. N. Prasad ◽  
P. S. Ramanujam
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Structural and Morphological Characterization of Ultrathin Films of an Asymmetric Polydiacetylene

1996 ◽  
Vol 440 ◽  
Author(s):  
H. C. Wang ◽  
D. W. Cheong ◽  
J. Kumar ◽  
C. Sung ◽  
S. K. Tripathy
Keyword(s):  
Second Harmonic ◽  
Morphological Characterization ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Glass Substrates ◽  
Atomic Force ◽  
Transmission Electron ◽  
Air Water Interface

AbstractA soluble, asymmetrically substituted polydiacetylene, poly(BPOD), has been reported to form stable monolayers at the air-water interface by the Langmuir-Blodgett (LB) technique [2]. Preformed polydiacetylene has been deposited onto hydrophobic substrates as multilayers to form second order nonlinear optical thin films. Second harmonic generation was found to increase with the number of layers. From previous atomic force microscopy (AFM) studies backbone orientation along the dipping direction with an interchain spacing of about 5 A° was indicated [2].The film morphology and preferential molecular orientation of these LB films are further investigated by transmission electron microscopy (TEM). A specifically tailored sample preparation method for the ultrathin LB films was used. Multilayer films were deposited on hydrophobic collodion covered glass substrates for this purpose. Electron diffraction was employed to study the crystalline organization of mono and multilayers of LB films as well as cast films.

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