Langmuir and Langmuir-Blodgett films of Cl-PPV mixed with stearic acid: implication of the morphology on the surface and spectroscopy properties

Sakai, Andrei; Péres, Laura O.; Caseli, Luciano

doi:10.1007/s00396-014-3477-4

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…After decompression, a less homogeneous monolayer is observed when compared to the compressed one, but it does not return to the same profile of the initial conditions. This behavior is similar to that described in the literature for Langmuir films of conjugated polymers, 16,31,32 and such aggregates can be associated to the hysteresis observed previously in this paper. In other words, the formation of these aggregates prevents the film from returning to initial conditions after decompression, corroborating with the results observed in the compression/decompression cycles (Figure 4).…”

Section: ■ Results and Discussionsupporting

confidence: 92%

“…For a 9-layer film of pure PDOF- co -3HTh, the TR values ranged from 1.47 to 0.73, and for the mixed film with phytase, the values varied between 1.06 and 0.51. Values distancing from 1.0 are expected considering the complexity of polymers, which can adopt other conformations when transferred from the liquid interface to the solid supports. ,,,− There was noted a general decrease in the TR values for the LB film composed of mixed components compared to the pure film, indicating that with the higher complexity of the system (with enzyme insertion), possible molecular rearrangements and formation of aggregates can occur during deposition on the solid support, hindering a more homogeneous deposition. Through the QCM technique, it was possible to observe that the mass increases linearly with the number of deposited layers for both kinds of LB films, which indicates a relatively uniform transfer in terms of mass.…”

Section: Resultsmentioning

confidence: 97%

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Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

2020

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In this work, the copolymer poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] was employed as a matrix for immobilizing phytase, aiming at the detection of phytic acid. The copolymer was spread on the air–water interface forming Langmuir monolayers and phytase adsorbed from the aqueous subphase. The interactions between the copolymer and the enzyme components were investigated with surface pressure and surface potential–area isotherms, Brewster angle microscopy, and polarization modulation infrared reflection–absorption spectroscopy (PM-IRRAS). The enzyme could be incorporated in the monolayers from the aqueous subphase, expanding the copolymer films and maintaining its secondary structure. The polymeric films presented a morphological heterogeneous pattern at the air–water interface because of the ability of their chains to fold and entangle, causing inherent defects in the organization as well as unbalanced lateral distribution at the air–water interface because of the formation of aggregates. The interfacial films were transferred to solid supports as Langmuir–Blodgett films and characterized by PM-IRRAS and scanning electronic microscopy, which showed not only the co-transfer of the enzyme but also the maintenance of their heterogeneous morphological pattern. The enzymatic activity of the blended film was analyzed by UV–vis spectroscopy and allowed the estimation of the value of the Michaelis constant (13.08 mM), demonstrating the feasibility of the system to selectively detect phytic acid for biosensing purposes.

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Section: ■ Results and Discussionsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

2020

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“…BAM images for a monolayer of DPPC (a), poly(2-chloride- p -phenylenevinylene) (b), and immortalized rabbit-aorta-derived endothelial cells with monoclonal antibody trastuzumab (c) . Reprinted with permission from refs − . Copyright 2009, 2015, and 2019 American Chemical Society, Springer, and Elsevier.…”

Section: Organization and Characterization Of Amphiphiles At The Air–...mentioning

confidence: 99%

The Past and the Future of Langmuir and Langmuir–Blodgett Films

2022

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The Langmuir–Blodgett (LB) technique, through which monolayers are transferred from the air/water interface onto a solid substrate, was the first method to allow for the controlled assembly of organic molecules. With its almost 100 year history, it has been the inspiration for most methods to functionalize surfaces and produce nanocoatings, in addition to serving to explore concepts in molecular electronics and nanoarchitectonics. This paper provides an overview of the history of Langmuir monolayers and LB films, including the potential use in devices and a discussion on why LB films are seldom considered for practical applications today. Emphasis is then given to two areas where these films offer unique opportunities, namely, in mimicking cell membrane models and exploiting nanoarchitectonics concepts to produce sensors, investigate molecular recognitions, and assemble molecular machines. The most promising topics for the short- and long-term prospects of the LB technique are also highlighted.

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“…161 For example, Andrei et al formed stable Langmuir films of PPV by adding stearic acid as a matrix. 162 The aggregation of polymer films was suppressed due to the interaction between the hybrid components at the molecular level. The hybrid films formed with stearic acid exhibited a more uniform and narrower luminescence spectrum, indicating the potential of such films for optoelectronic applications.…”

Section: Polymersmentioning

confidence: 99%

Controllable-assembled functional monolayers by the Langmuir–Blodgett technique for optoelectronic applications

Lin,

Zheng,

Zhong

et al. 2024

J. Mater. Chem. C

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Langmuir and Langmuir-Blodgett films of Cl-PPV mixed with stearic acid: implication of the morphology on the surface and spectroscopy properties

Cited by 7 publications

References 34 publications

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

Langmuir and Langmuir–Blodgett Films of Poly[(9,9-dioctylfluorene)-co-(3-hexylthiophene)] for Immobilization of Phytase: Possible Application as a Phytic Acid Sensor

The Past and the Future of Langmuir and Langmuir–Blodgett Films

Controllable-assembled functional monolayers by the Langmuir–Blodgett technique for optoelectronic applications

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