Journal articles: 'Polymer Nano-films'

1

Elmlund, Louise, Subramanian Suriyanarayanan, Jesper G. Wiklander, Teodor Aastrup, and Ian A. Nicholls. "Biotin selective polymer nano-films." Journal of Nanobiotechnology 12, no. 1 (2014): 8. http://dx.doi.org/10.1186/1477-3155-12-8.

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Liu, Shengda, Jiayun Xu, Xiumei Li, Tengfei Yan, Shuangjiang Yu, Hongcheng Sun, and Junqiu Liu. "Template-Free Self-Assembly of Two-Dimensional Polymers into Nano/Microstructured Materials." Molecules 26, no. 11 (May 31, 2021): 3310. http://dx.doi.org/10.3390/molecules26113310.

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In the past few decades, enormous efforts have been made to synthesize covalent polymer nano/microstructured materials with specific morphologies, due to the relationship between their structures and functions. Up to now, the formation of most of these structures often requires either templates or preorganization in order to construct a specific structure before, and then the subsequent removal of previous templates to form a desired structure, on account of the lack of “self-error-correcting” properties of reversible interactions in polymers. The above processes are time-consuming and tedious. A template-free, self-assembled strategy as a “bottom-up” route to fabricate well-defined nano/microstructures remains a challenge. Herein, we introduce the recent progress in template-free, self-assembled nano/microstructures formed by covalent two-dimensional (2D) polymers, such as polymer capsules, polymer films, polymer tubes and polymer rings.

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Yuan, Jun, Qi Xin Zheng, and Jian Cheng. "Fabrication, Characterization and Adsorptive of Human Fibrinogen of HA/PHBV Nano Composite Films." Advanced Materials Research 160-162 (November 2010): 1325–30. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1325.

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In this investigation, nano-scale hydroxyapatite (HA) particles were incorporated in poly(hydroxybutyrate-co-valerate) (PHBV) polymer to fabricate composite films using solvent casting method. The morphologies, mechanical properties and adsorptive of human fibrinogen of the composite films were investigated. The HA nano-particles were dispersed in the films and well bonded to the polymer. The strength of films could be enhanced and its adsorptive of human fibrinogen could be also improved greatly by introducing HA nano-particles into the films. The results suggested these newly developed nano-HA/PHBV composite films might serve as an effective biomedicine material.

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Ghosh, S., and Arpita Ray. "Silver nano particles from low dilution homeopathic medicine." American Journal of Applied Bio-Technology Research 2, no. 1 (January 1, 2021): 34–48. http://dx.doi.org/10.15864/ajabtr.215.

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Recently there have been many attempts for the biosynthesis of silver or gold nano particles from plant (root, leaves, stem etc.) extracts. In the present article, we have shown, for the first time, that low dilution China or Cina (Homeopathic medicines both of strength theta) can also dissociate AgNO3 producing Ag nanoparticles. We have stabilized these Ag nanoparticles in some bioactive polymers (like polyvinyl alcohol ,PVA) and studied their electrical and dielectric properties. Enhancement of conductivity and dielectric constants of these Ag stabilized polymer nanocomposite films compared to those of the corresponding pure polymer films indicated the presence of Ag nanoparticles in the films.

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Dabbaghianamiri, Maedeh, Sayantan Das, and Gary W. Beall. "Improvement Approach for Gas Barrier Behavior of Polymer/Clay Nanocomposite Films." MRS Advances 2, no. 57 (2017): 3547–52. http://dx.doi.org/10.1557/adv.2017.458.

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ABSTRACTPolymer nanocomposites (PNC) include a copolymer or polymer which has nanoparticles dispersed in the polymer matrix at the nano-level. One of the most common types of polymer nanocomposites contain smectic clays as the nanoparticles. These clay minerals increase the mechanical properties of standard polymers and improve barrier properties. For optimum barrier properties, Layer-by-Layer assembly (LbL) is one of the most effective methods for depositing thin films. LbL methods however, are quite tedious and produce large quantities of waste. A newly discovered phenomenon of self-assembled polymer nanocomposites utilizes entropic forces to drive the assembly to spontaneously form a larger nanostructured film. This approach allows polymers and nanoparticles with high particle loadings to be mixed, and create the super gas barrier films. We have developed a coating technique which can be employed to make self-assembled gas barrier films via inkjet printing. This technique is industrially scalable and efficient. This is because it does not need any rinsing step and drying steps as required in LbL. The influence of different polymers Polyvinylpyrrolidone (PVP) and Poly (acrylic acid) PAA with Montmorillonite (MMT) nanoclay solutions on Polyethylene terephthalate (PET) substrate is examined to study their effectiveness as a gas barrier film. The results showing the excellent oxygen barrier behavior of a combination of PVP and MMT Nano clay nanocomposite with high transparency. These high barrier gas nanocomposite films are good candidates for a variety of food packaging applications.

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Reddy, T. Ramesh, Bhooshan Muddam, A. R. Subrahmanyam, J. Siva Kumar Kumar, M. Ravindar Reddy, and K. Venkata Ramana. "Effect of TiO2 Nanoparticles on Structural and Optical Properties of Poly pyrrole, Poly vinyl alcohol Polymer Blend Thin Films." Oriental Journal Of Chemistry 38, no. 3 (June 30, 2022): 796–800. http://dx.doi.org/10.13005/ojc/380335.

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Thin films of (Poly Pyrrole - Poly Vinyl Alcohol) PPY-PVA polymer blend doped with different concentration of TiO2 nano particles were prepared via oxidative chemical polymerization technique (in-situ). The properties (Structural & Optical) of these thin films were studied by XRD, FTIR, SEM and UV spectroscopic techniques. The optical band gap values of TiO2 doped polymer blend were calculated by UV spectroscopic studies, and also noticed that obtained band gap values were decreased with increase in the concentration of TiO2 nano particles. XRD and FTIR results support the polymer blend formation, and dispersion of TiO2 nano particles in the polymer blend. The modification in surface morphology of polymer blend is due to presence of TiO2 nano particles which was confirmed by SEM results.

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Beake, Ben D., Stephen R. Goodes, James F. Smith, and Fengge Gao. "Nanoscale repetitive impact testing of polymer films." Journal of Materials Research 19, no. 1 (January 2004): 237–47. http://dx.doi.org/10.1557/jmr.2004.19.1.237.

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The deformation of polymer films under repetitive contact at high strain rates was investigated using nanoscale impact testing. Four systems were studied: (i) rubber-modified acrylonitrile-butadiene-styrene (ABS) (0–25 wt% rubber), (ii) uniaxially and biaxially drawn poly(ethylene terephthalate) film; (iii) poly(ethylene oxide)–clay nanocomposites, and (iv) nylon 6–organoclay nanocomposites. The initial results suggest that the technique has much potential in evaluating the fatigue behavior of thinner polymer films and coatings that are unsuitable for conventional methods designed for bulk samples. The extent of impact-induced deformation may be used as a measure of ductility because ductile failures are associated with significant plastic deformation before failure whereas brittle failures usually involve little plastic deformation. The nano-impact technique provides valuable highly localized information about deformation under high strain rate, which is complementary to low strain rate tests such as nanoindentation and nano-scratch. The technique has been shown to be sensitive to nano-/microstructural variations in ABS–rubber film when Berkovich indenters and low impact forces were used. The impact behavior of the nanocomposites is only significantly worse than that of the virgin polymers at the highest clay loading studied (15 wt%). This could be a factor when assessing the suitability of novel nanocomposite materials for applications where toughness is important. On ABS film, there is only an approximate correlation between the plastic work function determined from nanoindentation and the rubber loading in the film while the correlation between the rubber loading and nano-impact data is clear, suggesting that the dynamic test is a more useful predictor of thin polymer film toughness than the slow-loading quasi-static indentation test.

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Yamamoto, Tetsuya, Yuya Takahashi, and Naoya Toyoda. "Dispersion of Nano-materials in Polymer Composite Materials." MATEC Web of Conferences 333 (2021): 11003. http://dx.doi.org/10.1051/matecconf/202133311003.

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Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, polyNvinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.

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Yamamoto, Tetsuya, Yuya Takahashi, and Naoya Toyoda. "Dispersion of Nano-materials in Polymer Composite Materials." MATEC Web of Conferences 333 (2021): 11003. http://dx.doi.org/10.1051/matecconf/202133311003.

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Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, polyNvinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.

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10

Salikhov, R. B., A. N. Lachinov, R. G. Rakhmeev, R. M. Gadiev, A. R. Yusupov, and S. N. Salazkin. "Chemical sensors based on nano-polymer films." Measurement Techniques 52, no. 4 (April 2009): 427–31. http://dx.doi.org/10.1007/s11018-009-9277-4.

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11

Mehdi, Murtuza, Alidad Chandio, Maaz Akhtar, Zaibullah Khan, Ahsan Zaman, and Adeel Muhammad. "Silver nano platelet films on soft micro grating surface." Microelectronics International 36, no. 1 (January 7, 2019): 1–7. http://dx.doi.org/10.1108/mi-07-2018-0044.

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Purpose Polymer substrates with micron size roughness features have been found to play an important role in the mechanical performance of thin functional films which are used extensively in stretchable and flexible micro electromechanical systems. The purpose of this study is to report the stretchability and flexibility limits of micro size silver nano platelet films on a soft polymer substrate having two different orientations of micro grating with respect to the applied load. Design/methodology/approach Parallel and perpendicular micro gratings on the surface of a soft polymer substrate polydimethylsiloxane were patterned using a carefully machined master aluminum block and thin aluminum foils. Silver nano platelet-based films were rod coated on the substrate surface containing the micro gratings. These films were dried in ambient air and were tested for their stretchability and flexibility limits using homemade tools. Finite element modeling has also been performed and was found to support the experimental observations. Findings Experiments indicate that stretchability of silver nano platelet-based thin films tends to increase when the grating orientation remains parallel to the axis of the applied load, while its flexibility improves when the orientation becomes perpendicular to the loading axis. Originality/value The effect of grating orientation with respect to the applied load was investigated. The experiments show that micro grating roughness features are capable of enhancing the mechanical performance of nano platelet-based silver films on a soft polymer substrate and can be used in various stretchable and flexible micro electro mechanical device applications.

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Li, Heng, Conor M. Doyle, and Marilyn L. Minus. "Blending for Achieving Theoretical Mechanical and Electrical Property Enhancement in Polyacrylonitrile/SWNT Materials." Journal of Composites Science 6, no. 5 (April 22, 2022): 122. http://dx.doi.org/10.3390/jcs6050122.

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Filtration based processing of nanotube and polymer-nanotube dispersions is used to create polymer and nano-filler hybrid materials. The composite morphology consists of two layers: (1) a region where polymer chains have direct matrix interaction with the nano-fillers and (2) a nano-filler rich region excluded from matrix interactions. The experimental work here demonstrates the processing of this hybrid material using polyacrylonitrile (PAN) and single-wall carbon nanotubes (SWNT) at various PAN/SWNT weight concentrations. Mechanical analyses were performed to evaluate effective contributions from the SWNT in each of the defined layers. The region of high matrix-filler interactions exhibits blending behavior with material properties following suit. As a result, mechanical performance is consistent and begins to exceed theoretical predictions derived from Halpin–Tsai calculations. Tensile strength and modulus reached values as high as 60 MPa and 7.7 GPa, respectively, surpassing the performance of neat nano-filler (36 MPa, 3.9 GPa) and neat polymer matrix (44 MPa, 2.0 GPa) films. Additionally, the measurement of electrical properties shows that the blended polymer-SWNT region exhibits conductivity comparable to the filler. The results of this work suggest that blending polymers and nano-fillers is possible and may facilitate the production of materials with comparatively high mechanical performance and electrical conductivities.

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13

Song, Kenan, Yiying Zhang, Navid Tajaddod, and Marilyn L. Minus. "Application of the Electron Density Correlation Function for Structural Analysis of X-ray Scattering/Diffraction Information from Polymer-based Nano-Composites." MRS Proceedings 1754 (2015): 147–52. http://dx.doi.org/10.1557/opl.2015.760.

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ABSTRACTModern diffraction and scattering methods of X-ray radiation allow for multi-scale probing of the material morphology for both polymer-based composite films and fibers. These approaches and analyses tools can be used to map the makeup of individual grain structures in various polymer nano-composites in order to examine the effects of the fillers on nano-scale structural changes in the materials. The electron intensity correlation function, derived from Fourier transformations of the X-ray scattering pattern provides a path to analyze acquired data for space resolved domains. Here in this study, polymer-based nano-carbon composite systems are analyzed. The polymers used include polyvinyl alcohol, polyethylene, and polyacrilonitrile as matrix materials. The nano-carbon filler contribution to the grain size evolution is tracked by X-ray scattering/diffraction characterization. These results show that the relevant sizes of crystalline and amorphous domains within the lamellae structures correspond to the dispersion/distribution of the nano-filler in the composite materials. This work mainly illustrates an effective use of the correlation function to provide global morphological analysis in the composite system.

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Babu, J. Ramesh, K. Ravindhranath, and K. Vijaya Kumar. "Effect of Doping Nano Samarium(III) Oxide in PVA+Na3C6H5O7 Films for Battery Applications." Asian Journal of Chemistry 32, no. 8 (2020): 1947–54. http://dx.doi.org/10.14233/ajchem.2020.22673.

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The effect of doping nano Sm2O3 particles in PVA + Na3C6H5O7 (90:10% w/w) polymer composite films on the structural, thermal, electrical properties and battery parameters are investigated. The PVA + Na3C6H5O7 + nano Sm2O3 (90:10:1- 4% w/w) films were synthesized and characterized. A 2% w/w Sm2O3 film was relatively homogeneous with high amorphous in nature enabled the movement of nanoparticles in the matrix of polymer under potential gradient. The maximum conductivity was 2.09 × 10-3 S cm-1 for 2% w/w nano Sm2O3 film and it is 7 orders more than polyvinyl alcohol. The films were adopted in batteries with configuration: Anode (Mg+MgSO4)/[{PVA:Na3C6H5O7 (90:10% w/w)} + nano Sm2O3 (1-4% w/w)]/cathode (iodine + carbon + pieces of electrolyte) and battery parameters were assessed. The discharge time is 174 h with the cell having 2.0% w/w nano Sm2O3 film. These nano Sm2O3 doped films are successfully adopted in the fabrication of batteries and also the proposed cells are simple, effective, eco-friendly and economical.

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15

Tsukruk, Vladimir V. "Scanning Probe Microscopy of Polymer Surfaces." Rubber Chemistry and Technology 70, no. 3 (July 1, 1997): 430–67. http://dx.doi.org/10.5254/1.3538437.

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Abstract Basic principles and recent results of scanning probe microscopy (SPM) studies of polymer surfaces are reviewed. Applicability of various SPM techniques—including contact, dynamic, force modulation, friction force, chemical force, electrostatic, adhesion, and thermal modes—to probing of polymer surfaces is illustrated. Examples of recent studies of surface morphology and properties of various polymers are presented and briefly discussed. An extensive bibliography of more than 200 references is included. Classes of polymers considered here are: crystalline and amorphous, composites and blends, fibers and deformed polymers, block polymers and latexes, rubbers and liquid crystalline polymers, thin films and ionomers. Current focuses and future trends are summarized including quantitative SPM measurements, probing of nano- and microscale mechanical properties, studying dynamical surface properties, and exploring local chemical interactions.

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Babu, J. Ramesh, K. Ravindhranath, and K. Vijaya Kumar. "Nano-Pr2O3 Doped PVA + Na3C6H5O7 Polymer Electrolyte Films for Electrochemical Cell Applications." International Journal of Polymer Science 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/7906208.

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Varying concentrations of nano-Pr2O3 doped in “PVA + Sodium Citrate (90 : 10)” polyelectrolyte films are synthesized using solution cast technique and the films are characterized adopting FTIR, XRD, SEM, and DSC methods. The film with 3.0% of nano-Pr2O3 content is more homogenous and possesses more amorphous region that facilitate the deeper penetration of nanoparticles into the film causing more interactions between the functional groups of the polymeric film and nano-Pr2O3 particles and thereby turning the film more friendlily to the proton conductivity. The conductivity is maximum of 7 × 10−4 S/cm at room temperature for 3.0% nano-Pr2O3 film and at that composition, the activation energy and crystallinity are low. With increase in temperature, the conductivity is increasing and it is attributed to the hopping of interchain and intrachain ion movements and furthermore decrease in microscopic viscosity of the films. The major charge carriers are ions and not electrons. These films are incorporated successfully as polyelectrolytes in electrochemical cells which are evaluated for their discharge characteristics. It is found that the discharge time is maximum of 140 hrs with open circuit voltage of 1.78 V for film containing 3% of nano-Pr2O3 and this reflects its adoptability in the solid-state battery applications.

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Kwon, Sijoong, Sungwon Han, Daewoo Ihm, Eungryul Kim, and Jinyeol Kim. "Preparation and Characterization of Conductive Polymer Nano-Films." Molecular Crystals and Liquid Crystals 425, no. 1 (January 2004): 77–83. http://dx.doi.org/10.1080/15421400490506531.

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Kim, Jae-Kwang, Johan Scheers, Jou-Hyeon Ahn, Patrik Johansson, Aleksandar Matic, and Per Jacobsson. "Nano-fibrous polymer films for organic rechargeable batteries." J. Mater. Chem. A 1, no. 7 (2013): 2426–30. http://dx.doi.org/10.1039/c2ta00743f.

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Carlberg, Björn, Teng Wang, Johan Liu, and Dongkai Shangguan. "Polymer‐metal nano‐composite films for thermal management." Microelectronics International 26, no. 2 (May 8, 2009): 28–36. http://dx.doi.org/10.1108/13565360910960213.

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Sripada, Suresh, M. Chandrashekhar Reddy, T. Sreekanth, Rajesh Siripuram, and K. Venkateshwarlu. "Influence of Nano Filler (ZrO<sub>2</sub>) on Optical and Thermal Studies of Potassium Doped Polyethylene Oxide Solid Polymer Electrolytes." Materials Science Forum 1048 (January 4, 2022): 101–9. http://dx.doi.org/10.4028/www.scientific.net/msf.1048.101.

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Solid polymer electrolyte films made with potassium doped Polyethylene oxide using ZrO2 as nanofiller (70PEO-30KBF4-x ZrO2 where x = 1, 2.5, 5, 7.5, & 10 wt% ) were prepared by solution casting technique. Optical and thermal properties of polymer electrolyte films were studied by using Optical absorption and DSC techniques. From Optical absorption spectra, it is observed that fundamental absorption edge is shifted towards the higher wavelength side (range 259- 297 nm) with increase of nano filler (ZrO2) concentration (1-10 wt %). Optical band gap for all electronic transitions (p=1/2, 2, 2/3 and 1/3) are found to be increased as incorporation of nano filler (ZrO2) which confirms the structural rearrangements takes place in polymer electrolyte films. Optical band gap for indirect allowed transitions (p=1/2) are found to be in the range of 1.93-3.34eV. Decrease in Urbach energy (4.8eV- 1.4eV) is associated with decrease in defect formation in host polymeric matrix (PEO-KBF4) as a result of embedded nano filler (ZrO2). DSC spectra analysis of polymer electrolytes has showed melting temperatures in the range 63.63-73.71°C and highest crystallinity is found to be 85 % (10 wt % ZrO2). Enthalpy values are elevated with increase in nanofiller composition (ZrO2) in the present polymer electrolyte films.Keywords: PEO based polymer electrolytes, Solid polymer electrolytes, Optical and Thermal studies.

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Nagato, Keisuke, Yuki Yajima, and Masayuki Nakao. "Laser-Assisted Thermal Imprinting of Microlens Arrays—Effects of Pressing Pressure and Pattern Size." Materials 12, no. 4 (February 25, 2019): 675. http://dx.doi.org/10.3390/ma12040675.

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Polymer films with nano- or microstructured surfaces have been widely applied to optical devices, bioplates, and printed electronics. Laser-assisted thermal imprinting (LATI), in which a laser directly heats the surfaces of a mold and a thermoplastic polymer, is one of the high-throughput methods of replicating nano- or microstructures on polymer films. Only the surfaces of the mold and polymer film are heated and cooled rapidly, therefore it is possible to replicate nano- or microstructures on polymer films more rapidly than by using conventional thermal nanoimprinting. In this study, microlens arrays (MLAs) were replicated on polymethylmethacrylate (PMMA) films using LATI, and the effects of the pressing pressure (10−50 MPa) and the pattern size (33- and 5-μm pitch) of the MLA on the filling ratio were investigated by analyzing a microlens replicated using different laser-irradiation times (0.1−2 ms). The filling ratio increased with increasing pressing pressure and laser-irradiation time in the replication of MLAs with varying sizes, while the flow of the PMMA varied with the pressing pressure and laser-irradiation time. It was found that during filling, the shape of the polymer cross-sectional surface demonstrated a double and single peak in the 33- and 5-μm-pitch patterns, respectively. This was because the depth of the heated area in the 33-μm-pitch pattern was smaller than the pattern size, whereas that of the 5-μm-pitch pattern was comparable to (or larger) than the pattern size.

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Ramesh Babu, J., K. Ravindhranath, and K. Vijaya Kumar. "Preparation and Characterization of Nano-Dy2O3-Doped PVA + Na3C6H5O7 Polymer Electrolyte Films for Battery Applications." Advances in Materials Science and Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/2080369.

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Composite polymer electrolyte films containing various concentrations of nano-Dy2O3 (1.0 to 4.0%) in PVA + sodium citrate (90 : 10) are synthesized adopting solution cast method and are characterized using FTIR, XRD, SEM, and DSC techniques. The investigations indicate that all components are homogenously dispersed. Films containing 3% of nano-Dy2O3 are more homogenous and less crystalline, and the same is supported by DSC studies indicating the friendly nature to ionic conductivity. Transference number studies reveal that the major charge carriers are ions. With the increase in % of nano-Dy2O3, the conductivity increases and reaches maximum in 3% film with a value of 1.06 × 10−4 S/cm (at 303 K). Further, the conductivity of the film increases with raise in temperature due to the hopping of interchain and intrachain ion movements and fall in microscopic viscosity at the matrix interface of the film. Electrochemical cells are fabricated using these films with the configuration “anode (Mg + MgSO4)/[PVA (90%) + Na3C6H5O7 (10%) + (1–4% nano-Dy2O3)]/cathode (I2 + C + electrolyte),” and various discharge characteristics are evaluated. With 3% nano-Dy2O3 film, the maximum discharge time of 118 hrs with open-circuit voltage of 2.68 V, power density of 0.91 W/kg, and energy density of 107.5 Wh/kg are observed. These findings reflect the successful adoption of the developed polymer electrolyte films in electrochemical cells.

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Ramana, K. Venkata, M. Chandra Shekar, and V. Madhusudhana Reddy. "Characterization of Blended Polymer Electrolyte Thin Films Based on PVDF + PEG Doped with Nano SiO2." Oriental Journal Of Chemistry 38, no. 4 (August 31, 2022): 924–28. http://dx.doi.org/10.13005/ojc/380412.

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Solution Casting Technique (SCT) is used to prepare the films of poly vinylidene difluoride (PVDF) + poly ethylene glycol (PEG) + nano silicon dioxide (SiO2.). Modifications in structure, thermal stability and energy band gap values of all prepared thin films have been studied using XRD, SEM, DSC and UV-Vis. The disappearance of a small dip at higher concentrations of DSC plots of nano SiO2 in PVDF+PEG indicates that the decrease in the crystallinity which also supported by XRD results. From the SEM results it is observed that, at 10 wt.% of nano SiO2 of concentration amorphous nature is more which leads increase in thermal stability of the material. FTIR results show strong growth in the CF2 stretching with increasing concentratration of nano SiO2 in PVDF+PEG and also the intensity of the aliphatic C-H scattering vibrational bands are observed in spectra of PVDF+PEG and PVDF+PEG+nano SiO2. The direct band gap values of PVDF+PEG+nano SiO2 polymer electrolyte indicates the influence of nano SiO2 on PVDF+PEG for better conducting properties.

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Dorin, Bryce, Patrick Parkinson, and Patricia Scully. "Direct laser write process for 3D conductive carbon circuits in polyimide." Journal of Materials Chemistry C 5, no. 20 (2017): 4923–30. http://dx.doi.org/10.1039/c7tc01111c.

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Luo, Jin, Hong-Ping Zhang, Huai-Guo Huang, Ling-Ling Wu, and Zhong-Hua Lin. "Electrochemical-Assembly Approach to Nano-Ordered Conducting Polymer Films." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 337, no. 1 (November 1999): 157–60. http://dx.doi.org/10.1080/10587259908023401.

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KADO, Yuko, Atsushi AOKI, and Tokuji MIYASHITA. "Nano-surface Modification Using Reactive Polymer Langmuir-Blodgett Films." KOBUNSHI RONBUNSHU 59, no. 10 (2002): 590–95. http://dx.doi.org/10.1295/koron.59.590.

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ADACHI, Kanato, Atsushi SHISHIDO, Osamu TSUTSUMI, and Tomiki IKEDA. "Polymer Azobenzene Liquid Crystal Films with Nano-Second Photoresponse." KOBUNSHI RONBUNSHU 59, no. 12 (2002): 767–71. http://dx.doi.org/10.1295/koron.59.767.

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Li, Tiesheng, Masaya Mitsuishi, and Tokuji Miyashita. "Photodegradable polymer LB films for nano-lithographic imaging techniques." Thin Solid Films 389, no. 1-2 (June 2001): 267–71. http://dx.doi.org/10.1016/s0040-6090(01)00889-6.

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Liu, Chuanjun, Marcus C. Lopes, Sascha A. Pihan, Daniela Fell, Mordechai Sokuler, Hans-Jürgen Butt, Günter K. Auernhammer, and Elmar Bonaccurso. "Water diffusion in polymer nano-films measured with microcantilevers." Sensors and Actuators B: Chemical 160, no. 1 (December 2011): 32–38. http://dx.doi.org/10.1016/j.snb.2011.07.007.

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30

Karuppasamy, K., T. Linda, S. Thanikaikarasan, S. Balakumar, T. Mahalingam, P. J. Sebastian, and X. Sahaya Shajan. "Electrical and Dielectric Behavior of Nano-bio Ceramic Filler Incorporated Polymer Electrolytes for Rechargeable Lithium Batteries." Journal of New Materials for Electrochemical Systems 16, no. 2 (April 12, 2013): 115–20. http://dx.doi.org/10.14447/jnmes.v16i2.29.

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A series of nanocomposite solid polymer electrolytes (NCSPE) consisting of PMMA as host polymer, lithium bisoxalatoborate (LiBOB) as doping salt and nano-hydroxy apatite as filler have prepared by membrane hot-press method. To enhance the electrochemical properties and stiffness of polymer electrolyte film, a bioactive ceramic filler nano-hydroxy apatite is incorporated in the polymer matrix. The prepared different weight contents of NCSPE films are subjected to various electrochemical characterizations such as ionic conductivity, electric modulus and dielectric spectroscopy studies. The complexation behavior and structural reorganization in polymer electrolytes are confirmed by means of FT-IR (Fourier-Transform Infra Red Spectroscopy) analysis. The electrical response and relaxation of dipole in polymer electrolytes are investigated by means of electric modulus and dielectric studies. The addition of nano-hydroxy apatite significantly enhances the ionic conductivity and blocking the reorganizing tendency of polymer matrix. The maximum ionic conductivity is found to be in the range of 10-4.8 S/cm for sample containing 10 wt. % nanoceramic filler.

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Ishihara, Mina, Tomoya Watanabe, and Takashi Sasaki. "Adsorption Kinetics of Polystyrene and Poly(9-anthracenyl methyl methacrylate) onto SiO2 Surface Measured by Chip Nano-Calorimetry." Polymers 14, no. 3 (February 3, 2022): 605. http://dx.doi.org/10.3390/polym14030605.

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The alternating current (AC) chip nano-calorimetry is a powerful tool to investigate the physical properties of polymer thin films. In this paper, we report on the adsorption kinetics of polymers in which an AC chip nano-calorimetry was used for the first time. This technique allows for the real-time measurement of the adsorption kinetics of polymer chains onto the SiO2 surface. We used polystyrene (PS) and poly(9-anthracenyl methyl methacrylate) (PAMMA), which have different chemical natures and side group sizes. It was confirmed that the observed adsorption kinetics for PS were consistent with previously reported results obtained by dielectric spectroscopy. For PAMMA, we found characteristic adsorption kinetics, which shows a clear kink at the crossover between the early and later stages, while PS exhibits a lesser tendency of showing the kink as demonstrated by previously reported results.

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Mishra, Monali, Amritendu Roy, Sukalyan Dash, and Somdutta Mukherjee. "Flexible nano-GFO/PVDF piezoelectric-polymer nano-composite films for mechanical energy harvesting." IOP Conference Series: Materials Science and Engineering 338 (March 2018): 012026. http://dx.doi.org/10.1088/1757-899x/338/1/012026.

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Emamifar, Aryou, Mahdi Kadivar, Mohammad Shahedi, and Sabihe Soleimanian-Zad. "Preparation and Evaluation of Nanocomposite LDPE Films Containing Ag and ZnO for Food-Packaging Applications." Advanced Materials Research 129-131 (August 2010): 1228–32. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.1228.

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Nanocomposite polymer films were produced from composites comprising LDPE /nanosilver and LDPE/nano-ZnO by melt compounding. The mechanical properties of the films prepared were characterized by using stress-strain analysis. Dispersion quality of nanomaterials into the polymer matrix film was monitored using the Transmission Electron Microscopy. The results showed the nanocomposites as possessing lower elongation at break and more antimicrobial activity with the increase of each of nanofillers content.

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Hong, Sung Hoon, Eun Ju Hong, Byeong Ju Bae, and Heon Lee. "Glass Substrate with UV Imprinted Polymer Moth Eye Structure." Advanced Materials Research 47-50 (June 2008): 1241–44. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.1241.

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Artificial polycarbonate moth eye structured plate was used to emboss the moth eye nano-pattern into PVC films. Embossing was done at 100°C to prevent any damage on polycarbonate template. With embossing of moth eye nano-patterns, transmittance of PVC film was increased up to 6% over 400nm to 800nm wavelength region. This embossed PVC film was then used as an imprint template after depositing thin layer of SiO2 and self-assembled monolayer. Consequently, polymer based moth eye nano-patterns were formed on glass template after UV imprinting and its transmittance was increased from 90% to 92%.

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Ma, Weiwei, Zhiping Zhou, and Ping Li. "Preparation and fluid drag reduction properties of superhydrophobic paper-based films comprising carbon nanotubes and fluoropolymers." Science and Engineering of Composite Materials 24, no. 2 (March 1, 2017): 177–84. http://dx.doi.org/10.1515/secm-2014-0280.

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AbstractCarbon nanotubes (CNTs) were successfully prepared using chemical vapor deposition method on nickel-coated silicon substrates. The CNTs were then modified to obtain functionalized ends. Afterward, acrylate polymers were successfully grafted on the surface of CNTs by atom transfer radical polymerization method. The synthesis process was optimized by studying the surface properties of the composite films. It revealed the existence of chemical bonding between CNTs and polymers. The introduction of CNTs into polymers could improve the water resistance of films. Micro/nano and papillary structures similar to that of lotus leaf were obtained when the polymer matrix was partly etched. The excellent fluid drag reduction performances of film surfaces were expected to be applied in microfluid devices and packaging field.

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Fahim, I. S., N. Aboulkhair, and N. M. Everitt. "Nanoindentation Investigation on Chitosan Thin Films with Different Types of Nano Fillers." Journal of Materials Science Research 7, no. 2 (February 27, 2018): 11. http://dx.doi.org/10.5539/jmsr.v7n2p11.

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Chitosan nanocomposite thin films were fabricated using two types of chitosan natural polymer (cross-linked chitosan (CLCS) and non-cross-linked chitosan (NCLCS)), with three different weight percentages nano-fillers (Graphene (G) and fullerene (F)). Nanoindentation tests were performed to investigate the local mechanical properties of the produced nanocomposite in comparison to the unreinforced chitosan thin films. Nano hardness values (H) and indentation modulus (E) were measured using 5 and 10 µm spherical indenters. The addition of nano fillers enhanced the hardness of both types of films with the amount of hardening being directly proportional to the fraction of nano filler added(p<0.001). Crosslinking has also significantly increased the hardness (p< 0.001). The larger indentation returned a lower hardness. The use of different radii nano indenters underlined the indenter size effect due to the differing strain fields. The promising mechanical properties resulting from this research will allow using the fabricated nanocomposites for tissue engineering, biomedicine, drug delivery, electronics, energy, surface coatings and packaging applications.

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Padinhattayil, Sanoop, and K. Sheshappa Rai. "Analogy and Comparative Study of Hydroxypropyl Methylcellulose (HPMC) Biopolymer with Graphene Oxide and Zinc Oxide Nano Fillers." Asian Journal of Chemistry 33, no. 7 (2021): 1513–18. http://dx.doi.org/10.14233/ajchem.2021.23193.

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Present study describes the analogy and comparative study of polymer nanocomposites with the known polymer matrix hydroxypropyl methylcellulose (HPMC) incorporated with graphene oxide (GO) and zinc oxide (ZnO) nanoparticles as nano fillers. The polymer nanocomposite films were carried out using solution casting method and characterized by IR spectroscopy, XRD analysis, mechanical properties, thermal characterization and optical microscopy analysis. There were several changes in the HPMC polymer by the addition of nanoparticles of GO and ZnO in structural, thermal, mechanical and optical properties. The thermal stability of the composite films increased as compared with the pure HPMC whereas the mechanical study shows a variation of down values.

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Sabater i Serra, Roser, and Ángel Serrano-Aroca. "Special Issue: “Polymer-Based Biomaterials and Tissue Engineering”." Materials 16, no. 14 (July 10, 2023): 4923. http://dx.doi.org/10.3390/ma16144923.

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Polymers in the form of films, fibers, nano- and microspheres, composites, and porous supports are promising biomaterials for a wide range of advanced biomedical applications: wound healing, controlling drug delivery, anti-cancer therapy, biosensors, stem cell therapy, and tissue engineering [...]

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Kılıç, Enver Can, and Yavuz Salt. "Preparation and characterization of polydimethylsiloxane-based composite films." Materials Testing 63, no. 11 (November 1, 2021): 984–87. http://dx.doi.org/10.1515/mt-2021-0031.

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Abstract In this study, we aimed to find the characteristic properties of the neat and the composite polydimethylsiloxane (PDMS) films. The composite films were prepared by adding 5 A and NaY zeolites and nano-TiO2 to PDMS polymer matrix. In the preparation of the composite polymer films, the inorganic additives were added by 10 wt.-%. The structural and thermal characteristics of the prepared homogenous PDMS film and composite PDMS films were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The glass transition temperature of the films was found by differential scanning calorimetry (DSC). Finally, the mechanical properties of the films were obtained through tensile tests. The effects of 5 A and NaY zeolites and TiO2 on the neat PDMS films were investigated.

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Nawaz, Qamar, and Yahya Rharbi. "Glass Transition Related Relaxation Dynamic in Polystyrene Nanoparticles." Advanced Materials Research 326 (September 2011): 97–106. http://dx.doi.org/10.4028/www.scientific.net/amr.326.97.

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The impact of nanoconfinement on the dynamic and glass transition of polymers has been found altered in thin films and on the bulk free surface. Confined polymer in nanoparticles is an important system of application in water-borne environmental-friendly coatings. In this work, we discuss method to probe the large scale dynamic of nanoconfined polystyrene in close-packed structure of nanoparticles. We probe the deformation of polystyrene nanoparticles by applying stress at nano-scale level quantified via small-angle neutrons scattering technique. We extract information about the relaxation of the polystyrene confined in nanoparticles and compare it with the relaxation of the same polymer in bulk.

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Ayyanar, B., J. Suresh, V. Thangaraj, S. Karthikeyan, A. Arun, and M. Kayalvizhi. "Dielectric, AC Conductance of Chalcone Moiety, Metal Oxide Nanocomposite Doped Thin Polymer Film: Synthesis and Characterization." Asian Journal of Chemistry 34, no. 12 (2022): 3132–44. http://dx.doi.org/10.14233/ajchem.2022.24012.

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For conducting use, an organic molecule chalcone (1-(2,4-dichlorophenyl)-3-(4-hydroxy-phenyl)-prop- 2-en-1-one (DCHP) and metal oxide nanocomposite (MONC) doped polymer thin films were prepared. In addition, polyvinyl alcohol (PVA) and chitosan (CS) was utilized as a host polymer. The features of successfully prepared thin polymer films were characterized. The XRD analysis revealed the nano-sized (40-150 nm), crystalline phases and semi-crystalline behaviour of polymer films. The XPS and EDX confirmed the elements of PVA, CS, DCHP, MONC4 and MONC5, as well as the oxidation states of MONC4 and MONC5 sample films. The morphology of the prepared polymer film revealed an even distribution, a smooth surface and a blossoming flower-like structure from the SEM results. The TGA study revealed the multi-stage decomposition upon heating, but no complete decomposition for the produced film containing MONC4 and MONC5 thin films. The bonding between doped materials and the host polymer in the film was confirmed by FT-IR studies. The produced thin polymer composite film containing metal oxide nanocomposites and DCHP exhibited a high dielectric property and high AC conductance of 1.12 × 10-6 S cm-1 at room temperature.

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Ata, Sadia, Sadaf Amin, Ismat Bibi, Ijaz-ul Mohsin, Atif Islam, Azra Mehmood, Saba Irshad, Foziah F. Al-Fawzan, Siham A. Alissa, and Munawar Iqbal. "Kinetics of methylene blue dye adsorptive removal using halloysite nanocomposite hydrogels." Zeitschrift für Physikalische Chemie 236, no. 3 (September 27, 2021): 373–85. http://dx.doi.org/10.1515/zpch-2021-3075.

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Abstract In the present work, halloysite nano-clay (HNTs) based hydrogel was fabricated and their efficiency for the removal of methylene blue dye was studied. The hydrogel films were prepared with varying amount of halloysite nano-clay via facile solution casting method. Effect of halloysite clay on adsorption performance of composite was investigated. The hydrophobic thermoplastic synthetic polymer, polylactic acid (PLA) was blended with hydrophilic polymer polyvinyl alcohol (PVA) and HNTs to synthesize hydrogels. Swelling behavior and antimicrobial efficiency was also evaluated. The halloysite incorporating films showed excellent antibacterial activity. Swelling capacity of hydrogel with increased halloysite content was reduced due to increased crosslinking among polymer chains. Halloysite incorporated hydrogel exhibited higher adsorption ability as compared to film comprising of only PVA and PLA and dye removal followed pseudo first order kinetics. Film with 0.03 g HNTs rapidly attained adsorption-desorption equilibria and removed the dye completely within 30 min. Results confirmed that synthesized film could be potentially used for the removal of cationic dye and fabricated hydrogel film have promising potential for wastewater treatment since a higher adsorption capacity was observed for halloysite nano-clay incorporated hydrogel.

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Dogantzis, Nicholas P., Gregory K. Hodgson, and Stefania Impellizzeri. "Optical writing and single molecule reading of photoactivatable and silver nanoparticle-enhanced fluorescence." Nanoscale Advances 2, no. 5 (2020): 1956–66. http://dx.doi.org/10.1039/d0na00049c.

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We present a hybrid nano-molecular system for optically activated, silver nanoparticle enhanced fluorescence in solution and in thin-polymer films, alongside single molecule level insights into the metal-enhanced fluorescence mechanism.

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Loebner, Sarah, Joachim Jelken, Nataraja Yadavalli, Elena Sava, Nicolae Hurduc, and Svetlana Santer. "Motion of Adsorbed Nano-Particles on Azobenzene Containing Polymer Films." Molecules 21, no. 12 (December 3, 2016): 1663. http://dx.doi.org/10.3390/molecules21121663.

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Abdel Khafar, Eman A., Doaa B. Darwish, Ghena M. Al-Jahani, and Hosam El-Din Aboul Anean. "Bacterial Nano-polymer Production to Produce Edible Coating and Films." International Journal Of Pharmaceutical Research And Allied Sciences 11, no. 2 (2022): 13–23. http://dx.doi.org/10.51847/jrupdkpeav.

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Fan, Xiao, Jinghong Ma, and Yu Ma. "Nonequilibrium behavior of polymer nano films cast from different solvents." Journal of Physics: Conference Series 2011, no. 1 (September 1, 2021): 012056. http://dx.doi.org/10.1088/1742-6596/2011/1/012056.

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Thiry, Damien, Nathan Vinx, Fancisco Javier Aparicio, David Moerman, Roberto Lazzaroni, Damien Cossement, and Rony Snyders. "An innovative approach for micro/nano structuring plasma polymer films." Thin Solid Films 672 (February 2019): 26–32. http://dx.doi.org/10.1016/j.tsf.2018.12.050.

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Maximov, A. V., T. A. Val'kova, and O. G. Maximova. "Orientation Order and Birefringence in Nano-Layers of Polymer Films." Ferroelectrics 444, no. 1 (January 2013): 162–67. http://dx.doi.org/10.1080/00150193.2013.786641.

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Kumar, R., R. Jyothilakshmi, and H. L. Nandeesha. "Synthesis and testing for mechanical integrity of nano cellulose composites." Journal of Mines, Metals and Fuels 69, no. 12A (April 28, 2022): 37. http://dx.doi.org/10.18311/jmmf/2021/30092.

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This scientific research focused on extraction of the polymer from an appropriate source and preparation of films with mechanical integrity and desirable chemical properties. Reinforcement of said films with nano-fillers like Nano silica and clay were administered to reinforce their mechanical properties. Further development on these films would contribute to eliminating plastics and replacing them with better and sustainable materials. Cellulose may be a biopolymer found in plant cell walls which will be derived from biomass sources like sugarcane. It is one among the main constituents of plant cell walls alongside hemicellulose and lignin. “Cellulose consists of long unbranched fibers of glucose held together by hydrogen bonds”. It is widely utilized in paper, plastics, coatings and casings.

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Li, Hao, Zhang, Hou, Liu, and Liao. "Improvement of the Space Charge Suppression and Hydrophobicity Property of Cellulose Insulation Pressboard by Surface Sputtering a ZnO/PTFE Functional Film." Polymers 11, no. 10 (October 3, 2019): 1610. http://dx.doi.org/10.3390/polym11101610.

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Oil-impregnated cellulose insulation polymer (oil-paper/pressboard insulation) has been widely used in power transformers. Establishing effective ways of improving the physical and chemical properties of the cellulose insulation polymer is currently a popular research topic. In order to improve the charge injection inhibition and hydrophobic properties of the cellulose insulation polymer used in power transformers, nano-structure zinc oxide (ZnO) and polytetrafluoroethylene (PTFE) films were fabricated on a cellulose insulation pressboard surface via reactive radio frequency (RF) magnetron sputtering. Before the fabrication of their composite film, Accelrys Materials Studio (MS) software was applied to simulate the interaction between the nanoparticles and cellulose molecules to determine the depositing sequence. Simulation results show that the ZnO nanoparticle has a better adhesion strength with cellulose molecules than the PTFE nanoparticle, so ZnO film should be sputtered at first to fabricate the ZnO/PTFE composite film for better film quality. The sputtered, thin films were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The space charge injection behavior and the hydrophobicity performance of the untreated pressboard; and the cellulose insulation pressboard with sputtered nano-structure ZnO, PTFE, and the ZnO/PTFE functional films were compared with each other. X-ray photoelectron spectroscopy results showed that ZnO, PTFE, and ZnO/PTFE functional films were all successfully fabricated on the cellulose insulation pressboard surface. Scanning electron microscopy and XRD results present the nano-structure of the sputtered ZnO, PTFE, and ZnO/PTFE functional films and their amorphous states, respectively. The ZnO/PTFE composite functional film shows an apparent space charge suppression effect and hydrophobicity. The amount of the accumulated space charge in the pressboard sputtered ZnO/PTFE composite functional film decreased by about 40% compared with that in untreated cellulose insulation pressboard, and the water contact angle (WCA) increased from 0° to 116°.

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Journal articles on the topic 'Polymer Nano-films'

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