Poly(N-isopropylacrylamide) Thin Films Densely Grafted onto Gold Surface: Preparation, Characterization, and Dynamic AFM Study of Temperature-Induced Chain Conformational Changes

Langmuir ◽  
2009 ◽  
Vol 25 (2) ◽  
pp. 983-991 ◽  
Author(s):  
Franck Montagne ◽  
Jérome Polesel-Maris ◽  
Raphael Pugin ◽  
Harry Heinzelmann
Keyword(s):  
Thin Films ◽  
Conformational Changes ◽  
Surface Preparation ◽  
Gold Surface

Utilizing Conformational Changes for Patterning Thin Films of Recombinant Spider Silk Proteins

2012 ◽  
Vol 13 (10) ◽  
pp. 3189-3199 ◽  
Author(s):  
Seth L. Young ◽  
Maneesh Gupta ◽  
Christoph Hanske ◽  
Andreas Fery ◽  
Thomas Scheibel ◽  
...  
Keyword(s):  
Thin Films ◽  
Conformational Changes ◽  
Spider Silk ◽  
Silk Proteins

Structures of thin films of tertiary-phenyl-porphyrin derivatives on gold surface

2006 ◽  
Vol 499 (1-2) ◽  
pp. 157-160 ◽  
Author(s):  
T. Terui ◽  
S. Yokoyama ◽  
H. Suzuki ◽  
S. Mashiko ◽  
M. Sakurai ◽  
...  
Keyword(s):  
Thin Films ◽  
Gold Surface ◽  
Porphyrin Derivatives

scholarly journals Recognition of Conformational Changes in β-Lactoglobulin by Molecularly Imprinted Thin Films

2007 ◽  
Vol 8 (9) ◽  
pp. 2781-2787 ◽  
Author(s):  
Nicholas W. Turner ◽  
Xiao Liu ◽  
Sergey A. Piletsky ◽  
Vladimir Hlady ◽  
David W. Britt
Keyword(s):  
Thin Films ◽  
Conformational Changes ◽  
Molecularly Imprinted ◽  
Β Lactoglobulin

scholarly journals Adsorption of Hyperbranched Arabinogalactan-Proteins from Plant Exudate at the Solid–Liquid Interface

2019 ◽  
Vol 3 (2) ◽  
pp. 49 ◽  
Author(s):  
Athénaïs Davantès ◽  
Michaël Nigen ◽  
Christian Sanchez ◽  
Angelina d’Orlando ◽  
Denis Renard
Keyword(s):  
Conformational Changes ◽  
Structural Changes ◽  
Hydrophobic Interactions ◽  
Gold Surface ◽  
Dry Mass ◽  
Arabinogalactan Proteins ◽  
Liquid Interface ◽  
Gold Substrate ◽  
Solid Liquid Interface ◽  
Solid Liquid

Adsorption of hyperbranched arabinogalactan-proteins (AGPs) from two plant exudates, A. senegal and A. seyal, was thoroughly studied at the solid–liquid interface using quartz crystal microbalance with dissipation monitoring (QCM-D), surface plasmon resonance (SPR), and atomic force microscopy (AFM). Isotherms of the adsorption reveal that 3.3 fold more AGPs from A. seyal (500 ppm) are needed to cover the gold surface compared to A. senegal (150 ppm). The pH and salt concentration of the environment greatly affected the adsorption behavior of both gums, with the surface density ranging from 0.92 to 3.83 mg m−2 using SPR (i.e., “dry” mass) and from 1.16 to 19.07 mg m−2 using QCM-D (wet mass). Surprisingly, the mass adsorbed was the highest in conditions of strong electrostatic repulsions between the gold substrate and AGPs, i.e., pH 7.0, highlighting the contribution of other interactions involved in the adsorption process. Structural changes of AGPs induced by pH would result in swelling of the polysaccharide blocks and conformational changes of the polypeptide backbone, therefore increasing the protein accessibility and hydrophobic interactions and/or hydrogen bonds with the gold substrate.

Fabrication of Carboxylic Acid-Terminated Thin Films Using Poly(ethyleneimine) on a Gold Surface

Langmuir ◽  
1997 ◽  
Vol 13 (16) ◽  
pp. 4487-4489 ◽  
Author(s):  
Jeffrey J. Chance ◽  
William C. Purdy
Keyword(s):  
Thin Films ◽  
Carboxylic Acid ◽  
Gold Surface

Early Stages of Growth of BaTiO3 Thin-Films

1990 ◽  
Vol 200 ◽  
Author(s):  
M. Grant Norton ◽  
Gerald R. English ◽  
C. Barry Carter
Keyword(s):  
Thin Films ◽  
Film Growth ◽  
Lattice Mismatch ◽  
Pulsed Laser ◽  
Surface Preparation ◽  
Thin Foil ◽  
Stages Of Growth ◽  
Early Stages ◽  
Transmission Electron ◽  
Film Nucleation

ABSTRACTBarium titanate (BaTiO3) is of interest for use in a number of thin-film applications in electronic and optoelectronic devices. For these devices the formation of epitactic films of the correct stoichiometry and phase is essential. The substrate is important during the early stages of growth in the establishment of epitaxy, factors such as lattice mismatch, surface preparation and crystallographic orientation can all affect film nucleation and growth. In this study thin-films of BaTiO3 have been formed using the pulsed-laser ablation technique. The early stages of film growth have been studied directly using transmission electron microscopy by examination of very thin films deposited onto specially prepared electron-transparent thin-foil substrates.

scholarly journals Adhesion of Pseudomonas fluorescens(ATCC 17552) to Nonpolarized and Polarized Thin Films of Gold

2001 ◽  
Vol 67 (7) ◽  
pp. 3188-3194 ◽  
Author(s):  
J. P. Busalmen ◽  
S. R. de S�nchez
Keyword(s):  
Thin Films ◽  
Ionic Strength ◽  
Pseudomonas Fluorescens ◽  
Theoretical Calculations ◽  
Gold Surface ◽  
High Ionic Strength ◽  
Reversible Adhesion ◽  
Controlled Flow ◽  
Low Ionic Strength

ABSTRACT The adhesion of Pseudomonas fluorescens (ATCC 17552) to nonpolarized and negatively polarized thin films of gold was studied in situ by contrast microscopy using a thin-film electrochemical flow cell. The influence of the electrochemical potential was evaluated at two different ionic strengths (0.01 and 0.1 M NaCl; pH 7) under controlled flow. Adhesion to nonpolarized gold surfaces readily increased with the time of exposition at both ionic-strength values. At negative potentials (−0.2 and −0.5 V [Ag/AgCl-KCl saturated {sat.}]), on the other hand, bacterial adhesion was strongly inhibited. At 0.01 M NaCl, the inhibition was almost total at both negative potentials, whereas at 0.1 M NaCl the inhibition was proportional to the magnitude of the potential, being almost total at −0.5 V. The existence of reversible adhesion was investigated by carrying out experiments under stagnant conditions. Reversible adhesion was observed only at potential values very close to the potential of zero charge of the gold surface (0.0 V [Ag/AgCl-KCl sat.]) at a high ionic strength (0.1 M NaCl). Theoretical calculations of the Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy for the bacteria-gold interaction were in good agreement with experimental results at low ionic strength (0.01 M). At high ionic strength (0.1 M), deviations from DLVO behavior related to the participation of specific interactions were observed, when surfaces were polarized to negative potentials.

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