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.

New Strategies for Preparing Electrically Conductive Langmuir-Blodgett Films

1992 ◽  
Vol 247 ◽  
Author(s):  
J. H. Cheung ◽  
R. B. Rosner ◽  
M. F. Rubner
Keyword(s):  
Electrical Properties ◽  
Stearic Acid ◽  
Structural Changes ◽  
Solid State Reactions ◽  
Emeraldine Base ◽  
Structure Property ◽  
Electrically Conductive ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

ABSTRACTThe fabrication, structure and electrical properties of new electrically conductive Langmuir-Blodgett (LB) films of polyaniline and polypyrrole have been investigated. Polyaniline in its emeraldine-base form was mixed with stearic acid (PAN-B/SA) to produce stable films at the air-water interface (5/1 or 10/1 mole ratio of PAN-B/SA). These films were then transferred into multilayer films which were found to exhibit conductivities of about 1 S/cm upon doping with hydrochloric acid. The alkyl chains of the stearic acid molecules were found to be distributed randomly throughout the LB film thereby exerting a minimal influence on the electrical properties of the polyaniline phase. In addition to this mixed monolayer approach, a novel method of fabricating highly conductive polypyrrole LB films has been developed. This method is based on the sequential exposure of ferric stéarate LB films to hydrogen chloride (HC1) gas and pyrrole vapor. Each of these two solid state reactions was found to impart dramatic chemical and structural changes to the film. Polypyrrole LB films with conductivities as high as 5 S/cm were produced via this process. The electrical and optical properties of films made by both techniques were examined in order to elucidate their structure/property relationships.

Molecular Orientation of Phospholipid Langmuir-Blodgett Films

2006 ◽  
Vol 517 ◽  
pp. 65-68
Author(s):  
Khaulah Sulaiman ◽  
Wan Haliza Abd Majid ◽  
Muhamad Rasat Muhamad
Keyword(s):  
Fourier Transform ◽  
Molecular Orientation ◽  
Molecular Organization ◽  
Molecular Models ◽  
Space Filling ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Infra Red ◽  
Langmuir Blodgett Films

The molecular organization of the phospholipids Langmuir-Blodgett (LB) films on solid substrates has been studied via Fourier Transform Infra Red (FTIR) spectroscopy. In this study, the formation of well organized ultra thin LB films of phospholipid molecules has been performed by depositing the monolayer onto the solid substrates of silicon wafer. The space filling molecular models of two types of phospholipids have been proposed on the basis of the FTIR spectra.

Influence of Compression Process on Optical Properties of PDA Langmuir-Blodgett Films

1991 ◽  
Vol 237 ◽  
Author(s):  
Chun-wei Yuan ◽  
Chun-lin Lu ◽  
Yong Liang ◽  
Ning Gu ◽  
Yu Wei
Keyword(s):  
Optical Properties ◽  
Ordered Structure ◽  
Compression Process ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

ABSTRACTIn performing compression-expansion-recompression process during preparation of diacetylene (DA) monolayer, the change in colour of polydiacetylene (PDA) LB films was observed and more ordered structure of the films was achieved. The effect on optical properties could be ascribed to better arrangement of DA monomer which favoured the formation of PDA films in blue-form in polymerization.

scholarly journals QDs Supported on Langmuir-Blodgett Films of Polymers and Gemini Surfactant

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
T. Alejo ◽  
B. Martín-García ◽  
M. D. Merchán ◽  
M. M. Velázquez
Keyword(s):  
Quantum Dots ◽  
Maleic Anhydride ◽  
Ethyl Ester ◽  
Self Assembly ◽  
Gemini Surfactant ◽  
Cdse Quantum Dots ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Wetting Ability ◽  
Langmuir Blodgett Films

Different LB films of poly(octadecene-co-maleic anhydride), PMAO, poly(styrene-co-maleic anhydride) partial 2 butoxy ethyl ester cumene terminated, PS-MA-BEE, and Gemini surfactant ethyl-bis(dimethyl octadecylammonium bromide), 18-2-18, have been used to study the effect of the substrate coating on the surface self-assembly of CdSe quantum dots (QDs). Results show that all the “coating molecules” avoid the 3D aggregation of QDs observed when these nanoparticles are directly deposited on mica. Different morphologies were observed depending on the molecules used as coatings, and this was related to the surface properties, such as wetting ability, and the morphology of the coating LB films.

Chiral luminescent lanthanide complexes possessing strong (samarium, SmIII) circularly polarised luminescence (CPL), and their self-assembly into Langmuir–Blodgett films

2019 ◽  
Vol 48 (30) ◽  
pp. 11317-11325 ◽  
Author(s):  
Dawn E. Barry ◽  
Jonathan A. Kitchen ◽  
Laszlo Mercs ◽  
Robert D. Peacock ◽  
Martin Albrecht ◽  
...  
Keyword(s):  
Self Assembly ◽  
Lanthanide Complexes ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

The lanthanide directed self-assembly of chiral amphiphilic pda based ligands 1 and 2 with TbIII, SmIII, LuIII and DyIII salts was studied in CH3CN solution and as SAM LB-films.

Synthesis and Langmuir-Blodgett Films Properties of Zn (II) Meso-Tetra (α, β, α, β-o-pivalamidophenyl) Porphyrin

2013 ◽  
Vol 651 ◽  
pp. 3-6
Author(s):  
Yu Jie Ren ◽  
Fu De Zha ◽  
Chao Wei Wang ◽  
Qi Bin Chen
Keyword(s):  
Gas Detection ◽  
Great Change ◽  
Uv Spectrum ◽  
Lb Films ◽  
Film Performance ◽  
Langmuir Blodgett ◽  
Sensing Material ◽  
Film Forming ◽  
Vis Spectroscopy ◽  
Langmuir Blodgett Films

Zn(II)meso-tetra(α,β,α,β-o-pivalamidophenyl)-porphyrin was synthesized as a sensing material. It indicated an excellent film performance and significant optical response ability, which can be used for gas detection, such as: NO2, SO2and NH3.This material was characterized by IR, NMR, and AES, and its Langmuir-Blodgett films properties were also studied by means of UV-Vis-spectroscopy. The results showed that the zinc porphyrin’s UV spectrum and LB films properties occurred a great change compared with protoporphyrin, and it also had a good film forming capability and stability.

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.

NANOSURFACE MODIFICATION USING REACTIVE LANGMUIR–BLODGETT FILMS

2002 ◽  
Vol 01 (05n06) ◽  
pp. 637-640 ◽  
Author(s):  
Y. KADO ◽  
A. AOKI ◽  
T. MIYASHITA
Keyword(s):  
Fluorescent Microscopy ◽  
Ph Sensor ◽  
Fluorescein Isothiocyanate ◽  
Bulk Solution ◽  
Amino Group ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Ft Ir ◽  
Terminal Amino

We describe a simple and effective approach to the introduction of a functional group into polymer nanofilms on the solid surface using reactive Langmuir–Blodgett films. N-Dodecylacrylamide copolymers containing a terminal amino group in the side chains as a reactive moiety form a stable monolayer on a water surface, and the monolayer was transferred onto a solid support with a transfer ratio of unity. The LB films were characterized by various spectroscopic methods. The reactivity of the terminal amino group incorporated in the LB films was investigated in detail using fluorescein isothiocyanate (FITC) as a fluorescent probe. The chemical reaction between the amino group in the LB films and FITC in the bulk solution was completed within approximately 30 min and the chemical bond formation was confirmed by FT-IR spectroscopy. Furthermore, the ability as a pH sensor was observed with fluorescent microscopy.

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