Modification of paper using polyhydroxybutyrate to obtain biomimetic superhydrophobic substrates

Obeso, Constancio G.; Sousa, Maria P.; Song, Wenlong; Rodríguez‐Pérez, Miguel Ángel; Bhushan, Bharat; Mano, João F.

doi:10.1016/j.colsurfa.2012.09.052

Cited by 62 publications

(40 citation statements)

References 40 publications

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“…As a single example, the organization PHB into micro-or nanosized structures by a phase-separation technique, and their 400nm 400nm precipitation on paper has been realized [158]. In this process, papers were immersed in the PHBchloroform solution for a specified time, followed by an immersion in the mixture of ethanol-water acting as a non-solvent.…”

Section: Nanoscale Surface Structuring Towards (Super-)hydrophobic Pamentioning

confidence: 99%

Bio-Based Coatings for Paper Applications

2015

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Abstract:The barrier resistance and wettability of papers are commonly controlled by the application of petroleum-based derivatives such as polyethylene, waxes and/or fluor-derivatives as coating. While surface hydrophobicity is improved by employing these polymers, they have become disfavored due to limitations in fossil-oil resources, poor recyclability, and environmental concerns on generated waste with lack of biodegradation. Alternatively, biopolymers including polysaccharides, proteins, lipids and polyesters can be used to formulate new pathways for fully bio-based paper coatings. However, difficulties in processing of most biopolymers may arise due to hydrophilicity, crystallization behavior, brittleness or melt instabilities that hinder a full exploitation at industrial scale. Therefore, blending with other biopolymers, plasticizers and compatibilizers is advantageous to improve the coating performance. In this paper, an overview of barrier properties and processing of bio-based polymers and their composites as paper coating will be discussed. In particular, recent technical advances in nanotechnological routes for bio-based nano-composite coatings will be summarized, including the use of biopolymer nanoparticles, or nanofillers such as nanoclay and nanocellulose. The combination of biopolymers along with surface modification of nanofillers can be used to create hierarchical structures that enhance hydrophobicity, complete barrier protection and functionalities of coated papers. OPEN ACCESSCoatings 2015, 5 888

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Section: Nanoscale Surface Structuring Towards (Super-)hydrophobic Pamentioning

confidence: 99%

Bio-Based Coatings for Paper Applications

2015

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“…SH paper samples were prepared based on a process proposed before. 25 Paper samples with different sizes and shapes were cut from A4 sheets of cartridge paper and then immersed in chloroform for at least 6 h, to extract any possible additives soluble in the solvent. The pieces of paper were then immersed for a period of 6 h into a 7.5% (w/v) solution of PHB in chloroform.…”

Section: Methodsmentioning

confidence: 99%

Superhydrophobic Paper in the Development of Disposable Labware and Lab-on-Paper Devices

Sousa

Mano

2013

ACS Appl. Mater. Interfaces

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Traditionally in superhydrophobic surfaces history, the focus has frequently settled on the use of complex processing methodologies using nonbiodegradable and costly materials. In light of recent events on lab-on-paper emergence, there are now some efforts for the production of superhydrophobic paper but still with little development and confined to the fabrication of flat devices. This work gives a new look at the range of possible applications of bioinspired superhydrophobic paper-based substrates, obtained using a straightforward surface modification with poly-(hydroxybutyrate). As an end-of-proof of the possibility to create lab-on-chip portable devices, the patterning of superhydrophobic paper with different wettable shapes is shown with low-cost approaches. Furthermore, we suggest the use of superhydrophobic paper as an extremely low-cost material to design essential nonplanar lab apparatus, including reservoirs for liquid storage and manipulation, funnels, tips for pipettes, or accordion-shaped substrates for liquid transport or mixing. Such devices take the advantage of the self-cleaning and extremely water resistance properties of the surfaces as well as the actions that may be done with paper such as cut, glue, write, fold, warp, or burn. The obtained substrates showed lower propensity to adsorb proteins than the original paper, kept superhydrophobic character upon ethylene oxide sterilization and are disposable, suggesting that the developing devices could be especially adequate for use in contact with biological and hazardous materials.

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“…The spherical micro-sized PHB-MP have an average diameter of 25 ± 5 µm and clearly show well-developed internal structures, as visualized in Figure 1a and Figure 1b (magnification). The PHB-MP were synthesized by following a phase-separation technique [18], with some modifications: dimethylformamide (DMF) was used to dissolve PHB pellets instead of chloroform, with the advantage of dissolving more PHB in smaller amounts of solvent in less time. The formation of PHB-MP can be understood as a result of the exchanges between solvent and non-solvent in the system, where an ethanol/water mixture (acting as a non-solvent for PHB) diffuses into the PHB/DMF solution and induces the precipitation of PHB as spherical micro-sized particles.…”

Section: Morphological Analysis By Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

“…Similarly, cellulose stearoyl ester nanoparticles were made from solution via nanoprecipitation and spray-coated over papers to provide structured superhydrophobic surfaces with a water contact angle larger than 150°, exhibiting self-cleaning properties [17], while the surface hydrophobicity of these papers can be further tuned by thermal annealing. In another example, the bacterial polyhydroxybutyrate (PHB) polymer was applied on paper and transformed into micro-or nanoparticles through a phase-separation technique in direct contact with paper, providing high hydrophobicity [18]: however, the need for the long immersion times (12 hr) of the native PHB-coated paper in an ethanol/water coagulation bath resulted into the swelling of paper fibers and decrease in mechanical properties. Previously, PHB has been applied as a continuous film on paper by casting from a chloroform solution, resulting in lower moisture and water absorption in parallel with high surface hydrophobicity for PHB concentrations above 10 wt% [19].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polyhydroxybutyrate Particles with Micro-to-Nanosized Structures and Application as Protective Coating for Packaging Papers

Rastogi

Samyn

2016

Preprint

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This study reports on the development of bio-based hydrophobic coatings for packaging papers through deposition of polyhydroxybutyrate (PHB) particles in combination with nanofibrillated cellulose (NFC) and plant wax. In a first approach, PHB particles in micrometer range (PHB-MP) were prepared through a phase-separation technique providing internally nanosized structures. The particles were transferred as a coating by dip-coating filter papers in the particle suspension, followed by sizing with a carnauba wax solution. This approach allowed partial to almost full surface coverage of PHB-MP over the paper surface resulting in static water contact angles of 105° to 122° and 129° to 144° after additional wax coating. In a second approach, PHB particles with submicron sizes (PHB-SP) were synthesized by an oil-in-emulsion (o/w) solvent evaporation method, and mixed in aqueous suspensions with 0 to 7 wt% NFC. After dip-coating filter papers in PHB-SP/NFC suspensions and sizing with a carnauba wax solution, static water contact angles of 112 to 152° were obtained. The intrinsic properties of the particles were analyzed by scanning electron microscopy, thermal analysis and infrared spectroscopy, indicating higher crystallinity for PHB-SP than PHB-MP. The chemical interactions between the more amorphous PHB-MP particles and paper fibers were identified as an esterification reaction, while the morphology of the NFC fibrillar network was playing a key role as binding agent in the retention of more crystalline PHB-SP at the paper surface, hence contributing to higher hydrophobicity.

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Modification of paper using polyhydroxybutyrate to obtain biomimetic superhydrophobic substrates

Cited by 62 publications

References 40 publications

Bio-Based Coatings for Paper Applications

Bio-Based Coatings for Paper Applications

Superhydrophobic Paper in the Development of Disposable Labware and Lab-on-Paper Devices

Synthesis of Polyhydroxybutyrate Particles with Micro-to-Nanosized Structures and Application as Protective Coating for Packaging Papers

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