Transforming an intrinsically hydrophilic polymer to a robust self-cleaning superhydrophobic coating via carbon nanotube surface embedding

Hejazi, Iman; Sadeghi, Gity Mir Mohamad; Jafari, Seyed Hassan; Khonakdar, Hossein Ali; Seyfi, Javad; Holzschuh, Matthias; Simon, Frank

doi:10.1016/j.matdes.2015.07.092

Cited by 55 publications

(22 citation statements)

References 41 publications

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“…The diffraction peaks of TPO nanocomposites fabricated by TSE and FSP are shifted to lower angles 2.82° (31.3 A) and 2.58° (34.49 A), respectively. The reason for lower diffraction peak of TPO nanocomposite fabricated by FSP compared to nanocomposite made by TSE is attributed to the better dispersion of clay in the matrix and intercalation of polymer chains inside the silicate layers, as previously observed by other researchers .…”

Section: Resultssupporting

confidence: 70%

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Study of morphology and mechanical properties of PP/EPDM/clay nanocomposites prepared using twin‐screw extruder and friction stir process

et al. 2018

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In this paper, PP/EPDM nanocomposites with 5 wt% nanoclay are fabricated by friction stir processing (FSP) and compared to the results obtained via a conventional twin screw extruder (TSE). Also, the effects of process parameters of these process on morphology and mechanical properties of this nanocomposites are investigated using Taguchi analysis. The prepared PP/EPDM/clay nanocomposites by two methods were characterized using X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and mechanical property tests. Comparison of the results of these methods indicated that PP/EPDM/clay nanocomposite fabricated by FSP had a better dispersion of nanoclay and mechanical properties. The results show that by addition of 5 wt% nanoclay to the base material, the tensile strength and tensile modulus of FSP sample are 12% and 8% higher than the TSE sample. The TGA results shows that, the temperature at 50% weight loss for PP/EPDM blend is 382°C. While this temperature for TSE and FSP samples are 395°C and 406°C, respectively. Under optimal conditions of rotational speed of 1,200 rpm, traverse speed of 50 mm/min, shoulder temperature of 100°C and number passes of 3, simultaneous maximization of tensile strength (19.35 MPa), tensile modulus (643 MPa), impact strength (63 J/m) and elongation at break (101%) can be obtained. POLYM. COMPOS., 40:3306–3314, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 70%

“…Increase in feed rate increases the impact strength and elongation but decreases the tensile strength and tensile modulus. The residence time in the extruder decreases with increasing the feed rate which translates by a lesser dispersion of nanoclay in the TPO matrix .…”

Section: Resultsmentioning

confidence: 99%

Study of morphology and mechanical properties of PP/EPDM/clay nanocomposites prepared using twin‐screw extruder and friction stir process

et al. 2018

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“…This is a widely used parameter to describe the spreading phenomenon of a liquid (in this case, ultrapure water) on a solid surface [15]. For instance, values of θ c < 90 • and 90 • to 150 • indicate hydrophilic and hydrophobic characteristics, respectively [16,17]. Therefore, these three polymers have a hydrophilic character due to the low magnitude of θ c values as described previously [18][19][20].…”

Section: Contact Anglementioning

confidence: 99%

Production and Characterization of Glutathione-Chitosan Conjugate Films as Systems for Localized Release of Methotrexate

et al. 2019

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Cancer is one of the most serious public health problems that affect humanity. Diverse delivery systems of anticancer drugs have been developed to enhance the treatment effectiveness and patient compliance. Thus, drug delivery systems from polymeric films could be an interesting and promising alternative, especially for skin chemotherapeutics. In this work, polymeric films based on glutathione-chitosan conjugates with degrees of thiolation of 4.4%, 5.1% and 7.0% were synthetized by casting-evaporation method and subsequent loading with methotrexate. The surface properties of these films were evaluated by contact angle and spreading rate measurements. The sessile drop methods along with the thermodynamic parameter of work of adhesion were determined using the Young–Dupré semi-empirical model. The in vitro methotrexate release was assessed at a pH of 4.5 and 7.4 simulating physiological conditions. Data from the resulting profiles were fitted to the order one, Higuchi, Peppas–Sahlin and Korsmeyer–Peppas kinetic models. The results suggest a strong relationship between the thiolation degree and hydrophilic surface properties such as contact angle and water spreading rate, whereas the work of adhesion was not significantly affected. Further, these polymer films could control the methotrexate release through diverse mechanisms such as diffusion and relaxation depending on the thiolation degree and the aqueous medium employed. In fact, as thiolation degree increased, the release mechanism shifted from a primary diffusional type towards a predominant relaxation-driven mechanism. These polymer films could be used as modified systems for anticancer local delivery.

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Section: Why Nanotopography?mentioning

confidence: 99%

Questions and Answers on the Wettability of Nano‐Engineered Surfaces

MacGregor

Vasilev

2017

Adv Materials Inter

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Surface roughening has long been used to confer materials remarkable wetting properties, such as super hydrophobicity. When roughness belongs to the microscale, existing models can, to some extent, explain and predict real‐world wetting states. With the advent of nanotechnology, however, a multitude of nano‐engineered materials are being developed and unexpected wetting behaviors have been observed which cannot be described by conventional theories. While it is clear that advanced nanotextured materials are essential to a vast range of ground breaking technologies, the intricate mechanisms governing the wetting of such surfaces—at the limit of validity of continuum theories—also need to be clarified. This review aims at presenting what is known and what remains to be discovered about the wettability of nanoengineered materials. The advantages and uniqueness of nanostructured substrates is highlighted first, with a focus on practical applications benefitting from the distinctive wetting properties of nanorough substrates. Classic wetting theories and their limitations are briefly discussed, before describing with a top down vision, why the wetting of nanostructured substrates differ from that of microtextured surfaces. Recent experimental and theoretical studies which contributed to the progress in this field are considered, before outlining potential future areas of research.

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Transforming an intrinsically hydrophilic polymer to a robust self-cleaning superhydrophobic coating via carbon nanotube surface embedding

Cited by 55 publications

References 41 publications

Study of morphology and mechanical properties of PP/EPDM/clay nanocomposites prepared using twin‐screw extruder and friction stir process

Study of morphology and mechanical properties of PP/EPDM/clay nanocomposites prepared using twin‐screw extruder and friction stir process

Production and Characterization of Glutathione-Chitosan Conjugate Films as Systems for Localized Release of Methotrexate

Questions and Answers on the Wettability of Nano‐Engineered Surfaces

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