Self-Assembled α-Helical Polypeptide Films

1991 ◽  
Vol 255 ◽  
Author(s):  
Erwin P. Enriquez ◽  
Edward T. Samulski
Keyword(s):  
Thin Film ◽  
Orientation Distribution ◽  
The Self ◽  
Helix Axis ◽  
Langmuir Blodgett ◽  
Perfect Order ◽  
N Terminus ◽  
Orientational Distribution ◽  
Planar Orientation ◽  
Self Assembled

AbstractPoly(γ-benzyl-L-glutamate) (PBLG) derivatized at its N-terminus with lipoic acid, a disulfide-containing moiety, self-assembles on gold from helicogenic solvents to give a thin film with the polypeptide α-helices orientation distribution different from the planar orientation in the unlabeled, physisorbed PBLG films (control) and Langmuir-Blodgett monolayers. The SA films were studied by angle-dependent XPS, reflection-absorption FTIR spectroscopy, and ellipsometry. The IR dichroic properties of the amide I and amide II bands were used to infer the orientational distribution of the helices in the self-assembled film and lead to two extreme pictures of the helix axis distribution function: (a) random (hemispherical distribution) and (b) perfect order with a tilt of 53° from the surface normal. Additional characterization is necessary to differentiate between these two distributions.

Crucial Impact of Hydrophilicity on the Self-Assembled 2D Colloidal Crystals Using Langmuir–Blodgett Method

Langmuir ◽  
2020 ◽  
Vol 36 (34) ◽  
pp. 10061-10068
Author(s):  
Heping Wu ◽  
Gang Niu ◽  
Wei Ren ◽  
Luyue Jiang ◽  
Owen Liang ◽  
...  
Keyword(s):  
Colloidal Crystals ◽  
The Self ◽  
Langmuir Blodgett ◽  
Self Assembled

scholarly journals Multilayer Self-Assemblies as Electronic and Optical Materials

1997 ◽  
Vol 488 ◽  
Author(s):  
DeQuan Li ◽  
M. Lütt ◽  
Xiaobo Shi ◽  
M. R. Fitzsimmons
Keyword(s):  
Thin Film ◽  
Self Assembly ◽  
Film Growth ◽  
Building Blocks ◽  
Layer Growth ◽  
The Self ◽  
Growth Surface ◽  
Layer By Layer ◽  
Self Assembled ◽  
Average Electron

AbstractThe layer-by-layer growth of film structures consisting of sequential depositions of oppositely charged polymers and macrocycles (ring-shaped molecules) have been constructed using molecular self-assembly techniques. These self-assembled thin films were characterized with X-ray reflectometry, which yielded (1) the average electron density, (2) the average thicknesses, and (3) the roughness of the growth surface of the self-assembled multilayer of macrocycles and polymers. These observations suggest that inorganic-organic interactions play an important role during the initial stages of thin-film growth, but less so as the thin film becomes thicker. Optical absorption techniques were also used to characterize the self-assembled multilayers. Phorphyrin and phthalocyanine derivatives were chosen as the building blocks of the self-assembled multilayers because of their interesting optical properties.

SrTiO3 Functional Ceramics Thin Film Prepared by Self-Assembled Monolayers with PTCS Substrate Functionalization

2010 ◽  
Vol 105-106 ◽  
pp. 297-300
Author(s):  
Bo Qin ◽  
Guo Qiang Tan ◽  
Hong Yan Miao ◽  
Jian Liu ◽  
Ao Xia ◽  
...  
Keyword(s):  
Thin Film ◽  
Uv Radiation ◽  
Colloidal Particles ◽  
Film Surface ◽  
The Self ◽  
Self Assembled Monolayers ◽  
Supersaturated Solution ◽  
Thin Film Surface ◽  
Assembled Monolayers ◽  
Self Assembled

This article used PTCS to dispose the self-assembled substrate, and prepared the precursor by the ratio of AHFT / SN / BA = 1:1:3 and then immersed the functionalized substrate into the precursor supersaturated solution. With the colloidal particles absorption induced by SAMs, SrTiO3 thin film was prepared by the self-assembled monolayers with liquid phase deposition method. The effects of the time of UV radiation and the time of PTCS immersion on the substrate contact angle were studied and the time of UV radiation had an effect on the substrate functionalization after PTCS immersion. The results showed that the first UV radiation for 25 min, PTCS immersion for 7 min and the second UV radiation for 30 min were beneficial to the crystallization of SrTiO3. XRD and AFM were used to characterize the thin film physical phase and surface morphology at 600oCwith annealing and heat retaining for 2 hours. The results also showed that under the same condition, the SrTiO3 crystals on the thin film surface had the clear outline and the spherical crystals were distributed regularly and evenly.

scholarly journals Formation and physical properties of the self-assembled BFO–CFO vertically aligned nanocomposite on a CFO-buffered two-dimensional flexible mica substrate

RSC Advances ◽  
2021 ◽  
Vol 11 (26) ◽  
pp. 15539-15545
Author(s):  
Tahta Amrillah ◽  
Angga Hermawan ◽  
Shu Yin ◽  
Jenh-Yih Juang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Physical Properties ◽  
The Self ◽  
Two Dimensional ◽  
Mica Substrate ◽  
Vertically Aligned ◽  
Self Assembled

BiFeO3–CoFe2O4 vertically aligned nanocomposites, which mainly discovered in thin-films deposited on rigid substrates, have been successfully transformed into a flexible thin-film using a mica substrate.

Effects of fluoro substitutions and electrostatic interactions on the self-assembled structures and hydrogelation of tripeptides: tuning the mechanical properties of co-assembled hydrogels

Soft Matter ◽  
2020 ◽  
Vol 16 (44) ◽  
pp. 10143-10150 ◽  
Author(s):  
Abdelreheem Abdelfatah Saddik ◽  
Rajan Deepan Chakravarthy ◽  
Mohiuddin Mohammed ◽  
Hsin-Chieh Lin
Keyword(s):  
Mechanical Properties ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Phenylacetic Acid ◽  
The Self ◽  
N Terminus ◽  
Self Assembled ◽  
Aqueous Conditions

A series of FFK tripeptides capped with phenylacetic acid of various fluoro-substitutions at the N-terminus has been synthesized and examined for self-assembly under aqueous conditions.

BaTiO3 Functional Ceramics Thin Film Prepared by Self-Assembled Monolayers

2010 ◽  
Vol 105-106 ◽  
pp. 266-269
Author(s):  
Guo Qiang Tan ◽  
Cheng Zhang ◽  
Hong Yan Miao ◽  
Hui Jun Ren ◽  
Ao Xia
Keyword(s):  
Thin Film ◽  
Deposition Temperature ◽  
Precursor Solution ◽  
The Self ◽  
Self Assembled Monolayers ◽  
Si Substrate ◽  
Ph Values ◽  
Batio3 Film ◽  
Assembled Monolayers ◽  
Self Assembled

BaTiO3 thin film was prepared by the self-assembled monolayers technique and liquid phase deposition. The effects of pH values and the deposition temperature on the formation of BaTiO3 film were studied. The results showed that the Si substrate was in the precursor solution with 0.025mol/L (AHFT/BN/BA=1:1:3) and pH= 1.5. At 45°C deposited for 8h and annealed at 600°C for 2h, the BaTiO3 film with higher crystalline was prepared on the functionalized Si substrate. XRD and SEM tests showed that the film deposited in the precursor solution with different pH values appeared BaTiO3 characteristic peaks on the surface of every crystal. As pH values increased to 1.5 from 0.5, the strength of the film diffraction peak increased. But the width of the peak became smaller and the crystalline increased. When pH value was 2, due to the self-polymerized deposition of [Ti(OH)6]2-, it was easy to form the larger particles on the substrate. When the deposition temperature was 45°C, the acicular BaTiO3 film formed with the regular order and homogeneous planeness on the substrate. When the deposition temperature was between 55°C and 60°C, the dewatering and polymerizing speed between [Ti(OH)6]2- ions was higher than that between [Ti(OH)6]2- and -OH. The adsorption of the film to the Si substrate was weakened. It was easy for the film to fall off.

scholarly journals Homochiral Supramolecular Thin Film from Self-Assembly of Achiral Triarylamine Molecules by Circularly Polarized Light

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 402
Author(s):  
Changjun Park ◽  
Jinhee Lee ◽  
Taehyoung Kim ◽  
Jaechang Lim ◽  
Jeyoung Park ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Self Assembly ◽  
Polarized Light ◽  
Building Blocks ◽  
The Self ◽  
Assembly Process ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Self Assembled

Here, we report the formation of homochiral supramolecular thin film from achiral molecules, by using circularly polarized light (CPL) only as a chiral source, on the condition that irradiation of CPL does not induce a photochemical change of the achiral molecules. Thin films of self-assembled structures consisting of chiral supramolecular fibrils was obtained from the triarylamine derivatives through evaporation of the self-assembled triarylamine solution. The homochiral supramolecular helices with the desired handedness was achieved by irradiation of circularly polarized visible light during the self-assembly process, and the chiral stability of supramolecular self-assembled product was achieved by photopolymerization of the diacetylene moieties at side chains of the building blocks, with irradiation of circularly polarized ultraviolet light. This work provides a novel methodology for the generation of homochiral supramolecular thin film from the corresponding achiral molecules.

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