Ultrathin films of poly(2,5-dicyano- p -phenylene-vinylene)-co-( p -phenylene-vinylene) DCN-PPV/PPV: A Langmuir and Langmuir-Blodgett films study

Soares, Cecilia Gonçalves; Caseli, Luciano; Bertuzzi, Diego L.; Santos, Fábio Santana dos; Garcia, Jarem Raul; Péres, Laura O.

doi:10.1016/j.colsurfa.2014.11.033

Cited by 10 publications

(9 citation statements)

References 32 publications

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“…In order to fabricate coatings with controlled degradability properties, we herein propose a method that is not only cost-effective but also suitable for scaling-up the coatings production [5]. The dip-coating (DC) method accounts for a large coverage area and good maneuverability, thus it can be easily deployed in the fabrication of coated implants, irrespective of their geometric shape [6,7].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Evaluation of Dip-Coated PCL-Blend-PEG Coatings in Simulated Conditions

et al. 2020

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Our study focused on the long-term degradation under simulated conditions of coatings based on different compositions of polycaprolactone-polyethylene glycol blends (PCL-blend-PEG), fabricated for titanium implants by a dip-coating technique. The degradation behavior of polymeric coatings was evaluated by polymer mass loss measurements of the PCL-blend-PEG during immersion in SBF up to 16 weeks and correlated with those yielded from electrochemical experiments. The results are thoroughly supported by extensive compositional and surface analyses (FTIR, GIXRD, SEM, and wettability investigations). We found that the degradation behavior of PCL-blend-PEG coatings is governed by the properties of the main polymer constituents: the PEG solubilizes fast, immediately after the immersion, while the PCL degrades slowly over the whole period of time. Furthermore, the results evidence that the alteration of blend coatings is strongly enhanced by the increase in PEG content. The biological assessment unveiled the beneficial influence of PCL-blend-PEG coatings for the adhesion and spreading of both human-derived mesenchymal stem cells and endothelial cells.

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Section: Introductionmentioning

confidence: 99%

Long-Term Evaluation of Dip-Coated PCL-Blend-PEG Coatings in Simulated Conditions

et al. 2020

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“…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%

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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“…Packing increases the inter-and intra-chain effects, allowing high molecular control of the film architecture. 30 In this case, hydrophobic interactions between alkyl chains of SMA and among clusters polymerized of PSMA could generate the three phase changes observed from the discontinuity of surface pressure versus area isotherms. This feature is evidenced by observing the thicknesses of the photo-polymerized polymer films, as shown in Table 1.…”

Section: Characterization Of Monolayermentioning

confidence: 98%

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

et al. 2022

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Characterization of bidimensional polymeric films at the air−water interface in the Langmuir trough, despite being a recurrent topic, usually refers to films of already formed polymeric materials, with very scarce reports on direct polymerization at the air−water interface. In the present work, we studied the photopolymerization of stearyl methacrylate directly at the air−water interface under a nitrogen atmosphere, with the radical initiator solubilized in the aqueous phase. Two-dimensional (2D) polymerization was monitored by measuring the pressure−area isotherm at different irradiation times. The polymerization leads to a film with an isotherm different from that observed for the monomer, where the surface pressure is directly related to the irradiation time. The shape of this isotherm confirms the presence of a compressed liquid phase, where a higher order can be attained as a consequence of stronger packing forces involving polymer chains. The presence of inter-chain interactions allows rearrangements on the surface of the subphase, and even before the collapse a dense 2D ordering (with a solid phase-like behavior) can be observed. We present a new one-step, solvent-free procedure to obtain a photopolymeric film directly at the air−water interface, which can be transferred to a solid surface by the Langmuir−Blodgett method, allowing film preparation of controlled thickness. Films were characterized by measuring properties such as thickness, roughness, and hydrophobicity and comparing them with films obtained from a conventional polymer. We report the differences between the interfacial behavior of amphiphilic molecules and nanomaterials such as films obtained by photo-polymerization, PSMA, directly on the air−water interface.

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Ultrathin films of poly(2,5-dicyano- p -phenylene-vinylene)-co-( p -phenylene-vinylene) DCN-PPV/PPV: A Langmuir and Langmuir-Blodgett films study

Cited by 10 publications

References 32 publications

Long-Term Evaluation of Dip-Coated PCL-Blend-PEG Coatings in Simulated Conditions

Long-Term Evaluation of Dip-Coated PCL-Blend-PEG Coatings in Simulated Conditions

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

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

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