Construction of an arranged nano-fibrous structure by selforganization of a designed amphiphilic peptide based on β- strand

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Makoto Hattori ◽  
Shujiro Hayashi ◽  
Hidenori Yokoi ◽  
Masayoshi Tanaka ◽  
Takatoshi Kinoshita
Keyword(s):  
Amino Acid Residues ◽  
Nano Structure ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Ph Values ◽  
Self Organized ◽  
Air Water Interface ◽  
Nano Fiber ◽  
Amphiphilic Peptide ◽  
Β Sheet

AbstractAn amphiphilic peptide having alternate sequence of hydrophobic and charged amino acid residues, RFDF16 (CH3CO-RFDFRFDFRFDFRFDF-NH2), was designed to form a β-sheet monolayer at the air/water interface. The peptide monolayer was prepared by Langmuir-Blodgett (LB) method. The LB films were transferred onto mica substrates without the compressing process at various pH values in order to investigate a self-organized structure of peptide monolayer. Surface morphology of LB films showed arranged nano-fibers which have differences in interval between fibers and their orientation depending on pH of the subphase. On the other hand, the self-organized nano-fiber was also re-arranged by compressing process. The nano-fibers became elongated and aligned upon compression to higher surface pressures. The exploitation of an electrostatic interaction and compressing process will allow a larger two-dimensionally regulated nano-structure.

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.

scholarly journals FT–IR Studies on Langmuir–Blodgett Films of Novel Phosphorus Amphiphiles: Spontaneous Polycondensation at the Air/Water Interface

2005 ◽  
Vol 2005 (6) ◽  
pp. 385-387
Author(s):  
Hai-Yan Wang ◽  
Yan-Mei Li ◽  
Yi Xiao ◽  
Yu-Fen Zhao ◽  
Li-Xin Wu
Keyword(s):  
Spectroscopic Investigation ◽  
Water Interface ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Ir Studies ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Ft Ir ◽  
Ir Spectroscopic

A series of amphiphilic N-(O,O-dihexadecyl)phosphorylamino acids were designed and synthesised, and the transmission FT–IR spectroscopic investigation of their Langmuir–Blodgett films (LB films) on CaF2 substrates indicates the spontaneous polycondensation at the air/water interface before the deposition.

Photolithography and Photochemical Reaction of Copolymer Containing Anthracene in Langmuir-Blodgett Films

2011 ◽  
Vol 418-420 ◽  
pp. 698-701
Author(s):  
Wen Jian Xu ◽  
Tie Sheng Li ◽  
Gong Zhao ◽  
Yang Jie Wu ◽  
Tokuji Miyashita
Keyword(s):  
Chemical Structure ◽  
Light Wavelength ◽  
Solid Supports ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Molecular Arrangement ◽  
Tone Pattern ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Negative Tone

A series of copolymer containing photoactive anthracene group, poly(N-dodecylmeth- acrylamide-co-anthrylmethylacrylate) p(DDMA-co-AnMA) were synthesized. Their molecular arrangement and photolithographic properties in Langmuir–Blodgett (LB) films were investigated. The copolymer p(DDMA-co-AnMA) could form stable monolayer at air/water interface and could be transferred onto solid supports, giving Y-type uniform LB films. The result showed that the irradiation with difference light wavelength leaded to changes of copolymer LB films in their chemical structure, concerning only the anthracence unit. When irradiated at 248 nm, the anthracene acted as photodecomposition group because of the peroxides. On the other hand, the main photoreaction induced by 365 nm is dimerization of anthracene. As a result, posotive-tone and negative-tone pattern could get by choosing a suittable irradiation light wavelength. Etching resistance of p(DDMA-AnMA) LB films was also investigated in a nanometer regime permitting etching of gold.

Fabrication of Langmuir-Blodgett films of metallo- phthalocyanines by flow-orientation and dilution methods

2002 ◽  
Vol 06 (06) ◽  
pp. 389-395 ◽  
Author(s):  
Toshihiko Matsuura ◽  
Yuhei Shimoyama
Keyword(s):  
Electron Paramagnetic Resonance Spectroscopy ◽  
Transition Metal Ions ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Aggregation State ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Electron Paramagnetic

This paper reports on novel fabrication techniques for well-ordered Langmuir (L) and Langmuir-Blodgett (LB) films of metallo tetra-tert-butyl phthalocyanines (MTBPcs) containing various transition metal ions, i.e. Co 2+, Cu 2+, Zn 2+ and VO 2+. An extreme dilute concentration of a developing solution releases the aggregation state of MTBPcs. Furthermore, the flow-orientation adjusts in-plane ordering of MTBPcs. Both procedures enable the fabrication of well-ordered L-monolayers of MTBPcs at the air-water interface. For the LB films prepared by the vertical dipping method, an annealing procedure dramatically improves the ordering of MTBPcs. Electron paramagnetic resonance spectroscopy also reveals that a spin-chain system in the MTBPc LB films possesses a two-dimensional order.

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.

Nanosheet Films of Schiff Bases Polymer for Micropatterning

2014 ◽  
Vol 488-489 ◽  
pp. 260-264
Author(s):  
Qiu Ling Wang ◽  
Yong Na Li ◽  
Hui Ying Jia ◽  
Yong Ze Wei ◽  
Hui Fan Du ◽  
...  
Keyword(s):  
Free Radical ◽  
Film Formation ◽  
Wet Etching ◽  
Side Chain ◽  
Water Interface ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Air Water Interface ◽  
Deep Uv

A series of novel copolymers [p (AOBHA-co-NPMA)] containing 2-Allyloxy-N-benzylidene hexadecylamine (AOBHA) as film formation material and β-naphtayl methacrylate (NPMA) as photosensitive group were synthesized by free-radical polymerization. The copolymers could form stable condensed monolayer at air/water interface and be transformed onto solid substrates. Positive-tone patterns with the resolution of 0.75 μm of the copolymers Langmuir-Blodgett (LB) films with 35 layers were fabricated by deep UV irradiation, followed by developing with acetone. The etched gold patterns with resolution of 0.75 μm were also obtained, showing that the copolymer has enough resistance to wet etching suitable for fabricating photomask. The mechanism of photolysis was also investigated by UV and GPC, in which showed that the scission of main and side chain of p (AOBHA-co-NPMA) LB films occurred at the same time.

Nanostructured LB Films Developed from Ferrocenylthioamide and Ferrocenylselenoamide Compounds

2014 ◽  
Vol 1613 ◽  
pp. 67-72
Author(s):  
Rosa E. Lazo-Jiménez ◽  
María C. Ortega-Alfaro ◽  
José G. López- Cortés ◽  
José A. Chávez-Carvayar ◽  
Jordi Ignés-Mullol ◽  
...  
Keyword(s):  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Glass Substrates ◽  
Molecular Monolayers ◽  
Atomic Force ◽  
Pharmacological Interest ◽  
Air Water Interface ◽  
Conjugated Compounds ◽  
Donor Moiety

ABSTRACTIn this work, the synthesis of two amphiphilic π-conjugated compounds such as ferrocenylthioamide and ferrocenylselenoamide, with the general formula FcC=MNH(CH2)15CH3 with M = S or Se, are reported. The ferrocenyl group is a donor moiety forming a π-conjugated system with the amides of sulfur and selenium; both elements have also bioactivity with pharmacological interest. These two compounds formed Langmuir (L) monolayers at the air-water interface, which were characterized by isotherms of surface pressure versus molecular area (π-A) and compression/expansion cycles (hysteresis curves); Brewster angle microscopic images were also obtained. By using the Langmuir-Blodgett method molecular monolayers were transferred onto glass substrates. These nanostructures, in form of Langmuir-Blodgett (LB) films, were characterized through atomic force microscopy (AFM).

Film Formation Behavior of the Endohedral Metallofullerene DY@C82

1999 ◽  
Vol 593 ◽  
Author(s):  
Houjin Huang ◽  
Shihe Yang
Keyword(s):  
Partial Oxidation ◽  
Film Formation ◽  
Quartz Plate ◽  
Water Interface ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Lb Film ◽  
Endohedral Metallofullerene ◽  
Air Water Interface ◽  
Formation Behavior

ABSTRACTThe Langmuir-Blodgett (LB) film formation behavior of the endohedral metallofullerene Dy@C82 was studied at the air/water and Ar/water interfaces. The LB film constructed at the Ar/water interface (2-4 layers) was found to be thinner and more uniform than at the air/water interface (4-6 layers). Particulate aggregates were observed in the LB films, which contrasts the extended wire networks formed by direct evaporation of the metallofullerene solution on a quartz plate. The UV-Vis absorption peaks are blue-shifted for the LB film deposited in air, which is attributed to the partial oxidation of the metallofullerene balls. They are red-shifted, however, for the LB film at the Ar/water interface presumably due to the interaction between the pristine metallofullerenes.

Nanostructured LB films developed from poly(p-acryloylaminophenylmethylphosphonic) acid

2016 ◽  
Vol 1819 ◽  
Author(s):  
Rosa E. Lazo-Jiménez ◽  
José A. Chávez-Carvayar ◽  
Ana M. Herrera-González ◽  
Valentin Islas-Pérez ◽  
María P. Carreón-Castro
Keyword(s):  
Multilayer Films ◽  
Molecular Area ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Glass Substrates ◽  
Atomic Force ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Ordered Nanostructures

ABSTRACTIn this paper, the formation of Langmuir-Blodgett films of poly(p-acryloylaminophenylmethylphosphonic) acid polymers, with general formula (C10H12NPO4)n are reported. The Langmuir-Blodgett (LB) technique was used for building ordered nanostructures in molecular assemblies of these polymers, which were able to form stable films. At the air-water interface, these polymers (with low and high molecular weight) formed Langmuir (L) monolayers, which were characterized by surface pressure versus molecular area (π-A) isotherms and Brewster´s Angle Microscopy (BAM). Using the LB method, molecular mono and multilayer films of these polymers were prepared and transferred onto glass substrates forming Z-type multilayers, with a transfer ratio close to unity. These LB films were characterized by Atomic Force Microscopy (AFM).

Multifunctional Properties of (Z)-β-(N-Hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide: a Molecular Rectifier, Optically Non-Linear Dye, and Ammonia Sensor

2002 ◽  
Vol 55 (3) ◽  
pp. 199 ◽  
Author(s):  
G. J. Ashwell ◽  
G. A. N. Paxton
Keyword(s):  
Second Harmonic ◽  
Charge Transfer Band ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Optical Susceptibility ◽  
Current Voltage ◽  
Air Water Interface ◽  
Non Linear ◽  
Molecular Rectification ◽  
Molecular Rectifier

The zwitterionic dye, Z-β-(N-hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide (C16H33-Q3CNQ), forms dimeric solution aggregates, which are probably centric, but adopt a non-centrosymmetric arrangement at the air/water interface. When spread from dilute solution, e.g. 3 × 10-5 M in CH2Cl2, the resultant Langmuir-Blodgett (LB) films are purple, λmax 563 ± 3 nm. They have an optimum effective second-order non-linear optical susceptibility of 75 pm V-1 at 1.064 μm and, when sandwiched between gold electrodes, exhibit asymmetric current-voltage curves, characteristic of molecular rectification. In contrast, when spread at slightly higher concentrations (e.g. 10-4 M), the resultant LB films are polymorphic and have absorption maxima at 563 and 670 nm, the latter being characteristic of the benzyl analogue (φ-CH2-Q3CNQ). Its films are turquoise, λmax 668 ± 3 nm, and both molecular rectification and second-harmonic generation are inhibited. Thus, the red-shifted charge-transfer band probably reflects an altered alignment whereby the molecules adopt a centric antiparallel arrangement within the monolayer. The zwitterionic films readily protonate, with bleaching, and may be used to sense ammonia at concentrations of ca. 1 ppm by monitoring changes in the surface plasmon resonance.

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