Immobilization of a fluorinated polymer Langmuir–Blodgett monolayer on a solid substrate for surface nanocoating

2004 ◽  
Vol 14 (20) ◽  
pp. 3014-3018 ◽  
Author(s):  
Mohammod Aminuzzaman ◽  
Yuko Kado ◽  
Masaya Mitsuishi ◽  
Tokuji Miyashita
Keyword(s):  
Solid Substrate ◽  
Fluorinated Polymer ◽  
Langmuir Blodgett

Metastability in Monolayer Films Transferred onto Solid Substrates by the Langmuir-Blodgett Method: IR Evidence for Transfer-Induced Phase Transitions

1994 ◽  
Vol 48 (10) ◽  
pp. 1196-1203 ◽  
Author(s):  
Fazale R. Rana ◽  
Suci Widayati ◽  
Brian W. Gregory ◽  
Richard A. Dluhy
Keyword(s):  
Fatty Acid ◽  
Conformational Changes ◽  
Structural Changes ◽  
High Surface ◽  
Solid Substrate ◽  
Water Interface ◽  
Monolayer Films ◽  
Langmuir Blodgett ◽  
Monomolecular Film ◽  
Air Water Interface

The rate at which a monomolecular film is deposited onto a solid substrate in the Langmuir-Blodgett process of preparing supported monolayer films influences the final structure of the transferred film. Attenuated total reflectance infrared spectroscopic studies of monolayers transferred to germanium substrates show that the speed at which the substrate is drawn through the air/water interface influences the final conformation in the hydrocarbon chains of amphiphilic film molecules. This transfer-induced effect is especially evident when the monolayer is transferred from the expanded region of surface-pressure-molecular-area isotherms at low surface pressures; the effect is minimized when the film molecules are transferred from condensed phases at high surface pressures. This phenomenon has been observed for both a fatty acid and a phospholipid, which suggests that these conformational changes may occur in a variety of hydrocarbon amphiphiles transferred from the air/water interface. This conformational ordering may be due to a kinetically limited phase transition taking place in the meniscus formed between the solid substrate and aqueous subphase. In addition, the results obtained for both the phospholipid and fatty acid suggest that the structure of the amphiphile may help determine the extent and nature of the transfer-speed-induced structural changes taking place in the monomolecular film.

PREPARATION AND CHARACTERIZATION OF ORGANIC THIN FILM OF STEARIC ACID/PYRAZOLINE NANOPARTICLES

2006 ◽  
Vol 05 (02n03) ◽  
pp. 199-205
Author(s):  
YOUNG SOO KANG ◽  
SUN WHA OH ◽  
JONG HWA SUH
Keyword(s):  
Stearic Acid ◽  
Organic Thin Films ◽  
Solid Substrate ◽  
Organic Thin Film ◽  
Blodgett Film ◽  
Optical Absorbance ◽  
Langmuir Blodgett ◽  
Pressure Area

The organic thin films of stearic acid/pyrazoline nanoparticles were prepared by transferring Langmuir monolayer of stearic acid/pyrazoline nanoparticle onto the solid substrate. The complex of stearic acid/pyrazoline nanoparticle was studied with pressure–area isotherm at the air/water interface and identified with linearly increasing optical absorbance around 370 nm by increasing the number of deposited layers. The in situ domain structure and molecular orientation of the complex were measured with BAM. The surface morphology of the Langmuir–Blodgett film was observed with AFM. The dispersion of pyrazoline nanoparticle in the film was studied with TEM.

Biotinylated Polythiophene Copolymer – a Novel Electroactive Biomaterial Utilizing the Biotin-Streptavidin Interaction

1992 ◽  
Vol 292 ◽  
Author(s):  
Jeong-Ok Lim ◽  
Manjunath Kamath ◽  
Kenneth A. Marx ◽  
Sukant K. Tripathy ◽  
David L. Kaplan ◽  
...  
Keyword(s):  
Binding Sites ◽  
Solid Substrate ◽  
Emission Peak ◽  
One Dimensional ◽  
Langmuir Blodgett ◽  
Significant Area ◽  
Pressure Area ◽  
Biotin Binding ◽  
Monolayer Assembly ◽  
Area Expansion

AbstractA novel hierarchical biomaterial capable of incorporating any biotinylated biomolecule has been created. Our strategy is to biotinylate one-dimensional electroactive polymers and use a bridging streptavidin protein on Langmuir-Blodgett (LB) organized films. The following copolymeric system which enables functionalization of other molecules and formation of good monolayers was employed. Biotinylated poly(3-methanolthiophene-co-3-undecylthiophene) (B-PMUT) demonstrated a significantly better isotherm implying superior molecular packing compared to poly(3-methanolthiophene-co-3-undecylthiophene) (PMUT) on the LB airwater surface. The isotherm showed significant area expansion when streptavidin was injected below the B-PMUT monolayer in 0.1mM NaH2PO4/0.1 M NaCl buffer (pH 6.8) subphase. We then incorporated biotinylated phycoerythrin (B-PE) into this novel biomaterial by binding the unoccupied biotin binding sites on the bound streptavidin (4 sites total). The pressure-area isotherm of the protein injected monolayer showed area expansion. A characteristic fluorescent emission peak at 576nm was detected from the monolayer transferred onto a solid substrate. These observations demonstrated the function of B-PMUT in hierarchical monolayer assembly of molecules incorporating the biotin / streptavidin interaction.

Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

2009 ◽  
Vol 17 (2) ◽  
Author(s):  
K. Inglot ◽  
T. Martyński ◽  
D. Bauman
Keyword(s):  
Molecular Structure ◽  
Liquid Crystal ◽  
Azo Dye ◽  
Electronic Absorption Spectra ◽  
Terminal Group ◽  
Solid Substrate ◽  
Langmuir Films ◽  
Molecular Organization ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

AbstractA study of azo dye/liquid crystal mixtures in monolayers formed at air-water (Langmuir films) and air-solid substrate (Langmuir-Blodgett films) interfaces was performed. Three azo dyes with various molecular structure and two liquid crystal materials: 4-octyl-4′-cyanobiphenyl (8CB) and trans-4-octyl(4′-cyanophenyl)-cyclohexane (8PCH) were used. The morphology of Langmuir films was monitored by means of a Brewster angle microscope (BAM). Moreover, a surface pressure and electronic absorption spectra of the monolayer spread on the water surface of dye/liquid crystal mixtures as a function of a mean molecular area were simultaneously recorded. In addition, the absorption for Langmuir-Blodgett films deposited on quartz plates was measured. Information about intermolecular interactions in the mixtures of the nonamphiphilic dye and the liquid crystal with polar terminal group was obtained. Conclusions about the formation of self-aggregates between dye molecules have been drawn. The influence of the dye molecular structure and its concentration on aggregates’ geometry was found.

Aggregation-Induced Linear and Non-Linear Optical Properties of Four Hydroxy-Substituted Analogues of 2,4-Bis[4-(dibutylamino)phenyl]squaraine

1998 ◽  
Vol 51 (7) ◽  
pp. 599 ◽  
Author(s):  
Geoffrey J. Ashwell ◽  
Patricia C. Williamson ◽  
Andrew Green ◽  
Gurmit S. Bahra ◽  
Christopher R. Brown
Keyword(s):  
Second Harmonic ◽  
Solid Substrate ◽  
Molecular Structures ◽  
High Mass ◽  
Ionization Mass ◽  
Langmuir Blodgett ◽  
Non Linear ◽  
Langmuir Blodgett Films ◽  
Linear Optical Properties ◽  
Linear Optical

Langmuir films of the title compound, 2,4-bis[4-(dibutylamino)phenyl]squaraine, Sq0, and its substituted analogues, Sq1 (monohydroxy) to Sq4 (tetrahydroxy), exhibit three well defined phases at the air–water interface: λmax 525–550 nm (H-aggregate); 660–670 nm (intermediate); 760–770 nm (J-aggregate). The monolayer spectra are influenced by the surface pressure and the number of hydroxy substituents and, when the monolayers are transferred to a solid substrate, there is a correlation between the linear and non-linear optical behaviour of the Langmuir-Blodgett films. Second-harmonic generation has been observed even though the unit molecular structures of two analogues, Sq0 and Sq4, are centric. The behaviour is aggregation-induced and there is evidence that the dyes associate in dilute solution. The electrospray ionization mass spectra exhibit peaks with high mass/charge (m/z) ratios; the data conform to the dimeric aggregate and, for solutions of two or more squaraines, corroborate the existence of heteromolecular associates.

Strained-layer Van Der Waals epitaxy in a Langmuir-Blodgett film

1993 ◽  
Vol 51 ◽  
pp. 514-515
Author(s):  
Ravi Viswanathan
Keyword(s):  
Molecular Electronics ◽  
Surface Science ◽  
Van Der Waals ◽  
Solid Substrate ◽  
Molecular Layering ◽  
Lb Films ◽  
Strained Layer ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Potential Applications

Langmuir-Blodgett (LB) films are layered structures of amphiphilic molecules which are assembled by successive deposition on a solid substrate from a monolayer at the air water interface. Most of the potential applications of LB films (molecular electronics, cell membrane models, biosensors) are based on the premise of perfect molecular layering and orientation. The technique of atomic force microscopy (AFM), which probes only the outermost layer of the film, has opened up the study of the surfaces of these films which occupy a unique position at the intersection of surface science and complex fluids. We show here that the growth of lead stearate (PbSt) LB films on mica substrates proceeds by a new type of epitaxy which we call “strained layer van der Waals epitaxy” because it represents a compromise between the mechanisms of strained-layer epitaxy and van der Waals epitaxy.The PbSt films were prepared with the standard Langmuir-Blodgett vertical dipping method and imaged with the AFM in air at ambient temperature.

Fabrication of Carbon Nanotube Langmuir-Blodgett Film by Polyion Complex Method

2006 ◽  
Vol 963 ◽  
Author(s):  
Jun Matsui ◽  
Manabu Iko ◽  
Nobuhiro Inokuma ◽  
Hironori Orikasa ◽  
Takashi Kyotani ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Solid Substrate ◽  
Complex Method ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Polyion Complex ◽  
Dimensional Network ◽  
Multi Walled Carbon Nanotube ◽  
Air Water Interface ◽  
Langmuir Blodgett Film

ABSTRACTCarbon nanotube Langmuir-Blodgett film was fabricated using polyion complex method. Multi-walled carbon nanotube (MWCNT) synthesized by template method form a stable polyion complex monolayer at the air/water interface. The monolayer can be transferred onto a solid substrate. The AFM image of the monolayer shows a one-dimensional network structure of MWCNT..

Design of ion sensor based on Langmuir-Blodgett films having potential-sensitive dye: effect of surface treatment of solid substrate on potassium-ion sensing

1993 ◽  
Vol 14 (1-3) ◽  
pp. 629-631 ◽  
Author(s):  
Masatsugu Shimomura ◽  
Akira Honma ◽  
Seiji Kondo ◽  
Etsuo Shinohara ◽  
Nobuyashi Tajima ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Solid Substrate ◽  
Potassium Ion ◽  
Ion Sensor ◽  
Langmuir Blodgett ◽  
Ion Sensing ◽  
Langmuir Blodgett Films ◽  
Effect Of Surface

Intermolecular interactions in Langmuir-Blodget films of liquid crystalline perylene derivatives

2008 ◽  
Vol 16 (3) ◽  
Author(s):  
R. Hertmanowski ◽  
T. Martyński ◽  
R. Stolarski ◽  
D. Bauman
Keyword(s):  
Liquid Crystalline ◽  
Fluorescence Spectra ◽  
Solid Substrate ◽  
Discotic Liquid Crystals ◽  
Dye Molecules ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Alkyl Chains ◽  
Perylene Derivatives ◽  
J Aggregates

AbstractLangmuir-Blodgett (LB) films formed of some discotic liquid crystals, namely 3,4,9,10-tetra-(n-alkoxy-carbonyl)-perylenes, mixed with arachid acid have been studied. The absorption and fluorescence spectra were recorded. The results obtained have led to conclusions about formation of self-aggregates of dye molecules both in ground and excited states at the air-solid substrate interface. It was found that some fraction of J-aggregates can be created in the ground state. In the excited state, mostly excimers appear and the number of this kind of aggregates depends on the length of the alkyl chains substituted to the perylene core, as well as on the dye concentration and the number of layers in LB films.

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