scholarly journals Model Surfaces for Paper Fibers Prepared from Carboxymethyl Cellulose and Polycations

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 435
Author(s):  
Cassia Lux ◽  
Thomas Tilger ◽  
Ramsia Geisler ◽  
Olaf Soltwedel ◽  
Regine von Klitzing
Keyword(s):  
Water Uptake ◽  
Carboxymethyl Cellulose ◽  
High Mobility ◽  
High Water ◽  
Dip Coating ◽  
Suitable Model ◽  
Force Microscopy ◽  
Atomic Force ◽  
Model Surfaces ◽  
Paper Fibers

For tailored functionalization of cellulose based papers, the interaction between paper fibers and functional additives must be understood. Planar cellulose surfaces represent a suitable model system for studying the binding of additives. In this work, polyelectrolyte multilayers (PEMs) are prepared by alternating dip-coating of the negatively charged cellulose derivate carboxymethyl cellulose and a polycation, either polydiallyldimethylammonium chloride (PDADMAC) or chitosan (CHI). The parameters varied during PEM formation are the concentrations (0.1–5 g/L) and pH (pH = 2–6) of the dipping solutions. Both PEM systems grow exponentially, revealing a high mobility of the polyelectrolytes (PEs). The pH-tunable charge density leads to PEMs with different surface topographies. Quartz crystal microbalance experiments with dissipation monitoring (QCM-D) reveal the pronounced viscoelastic properties of the PEMs. Ellipsometry and atomic force microscopy (AFM) measurements show that the strong and highly charged polycation PDADMAC leads to the formation of smooth PEMs. The weak polycation CHI forms cellulose model surfaces with higher film thicknesses and a tunable roughness. Both PEM systems exhibit a high water uptake when exposed to a humid environment, with the PDADMAC/carboxymethyl cellulose (CMC) PEMs resulting in a water uptake up to 60% and CHI/CMC up to 20%. The resulting PEMs are water-stable, but water swellable model surfaces with a controllable roughness and topography.

scholarly journals Preparation And Properties Of Bionanocomposite Films Reinforced With Nanocellulose Isolated From Moroccan Alfa Fibres

2015 ◽  
Vol 15 (3) ◽  
pp. 164-172 ◽  
Author(s):  
Benyoussif Youssef ◽  
Aboulhrouz Soumia ◽  
El Achaby Mounir ◽  
Cherkaoui Omar ◽  
Lallam Abdelaziz ◽  
...  
Keyword(s):  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Fourier Transforms ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
X Ray Diffraction ◽  
Vapour Permeability ◽  
Force Microscopy ◽  
Atomic Force ◽  
Bionanocomposite Films

AbstractNanocellulose (NC) were extracted from the Moroccan Alfa plant (Stipa tenacissima L.) and characterised. These Alfa cellulosic nanoparticles were used as reinforcing phase to prepare bionanocomposite films using carboxymethyl cellulose as matrix. These films were obtained by the casting/evaporation method. The crystallinity of NC was analysed by X-ray diffraction, the dimension of NC by atomic force microscopy, molecular interactions due to incorporation of NC in carboxymethyl cellulose (CMC) matrix were supported by Fourier transforms infrared (FTIR) spectroscopy. The properties of the ensuing bionanocomposite films were investigated using tensile tests, water vapour permeability (WVP) study and thermogravimetric analysis. With the progress of purification treatment of cellulose, the crystallinity is improved compared to the untreated fibres; this can be explained by the disappearance of the amorphous areas in cellulose chain of the plant. Consequently, the tensile modulus and tensile strength of CMC film increased by 60 and 47%, respectively, in the bionanocomposite films with 10 wt% of NC, and decrease by 8.6% for WVP with the same content of NC. The NC obtained from the Moroccan Alfa fibres can be used as a reinforcing agent for the preparation of bionanocomposites, and they have a high potential for the development of completely biodegradable food packaging materials.

scholarly journals Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Gels ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 49
Author(s):  
Bijender Kumar ◽  
Ruchir Priyadarshi ◽  
Sauraj ◽  
Farha Deeba ◽  
Anurag Kulshreshtha ◽  
...  
Keyword(s):  
Carboxymethyl Cellulose ◽  
Sodium Carboxymethyl Cellulose ◽  
Sodium Acrylate ◽  
X Ray Diffraction ◽  
Hybrid Hydrogel ◽  
X Ray ◽  
Hydrogel Beads ◽  
Force Microscopy ◽  
Atomic Force ◽  
Potential Applications

Novel sodium carboxymethyl cellulose-g-poly (sodium acrylate)/Ferric chloride (CMC-g-PNaA/FeCl3) nanoporous hydrogel beads were prepared based on the ionic cross-linking between CMC-g-PNaA and FeCl3. The structure of CMC and CMC-g-PNaA were elucidated by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy, and the elemental composition was analyzed by energy dispersive X-ray analysis (EDX). The physicochemical properties of the CMC-g-PNaA/FeCl3 hydrogel beads were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetric analysis (TGA). The swelling percentage of hydrogel beads was studied at different time periods. The obtained CMC-g-PNaA/FeCl3 hydrogel beads exhibited a higher nanoporous morphology than those of CMC-g-PNaA and CMC beads. Furthermore, an AFM image of the CMC-g-PNaA/FeCl3 beads shows granule type topology. Compared to the CMC-g-PNaA (189 °C), CMC-g-PNaA/FeCl3 hydrogel beads exhibited improvement in thermal stability (199 °C). Furthermore, CMC-g-PNaA/FeCl3 hydrogel beads depicted a higher swelling percentage capacity of around 1452%, as compared to CMC-g-PNaA (1096%). Moreover, this strategy with preliminary results could be useful for the development of polysaccharide-based hybrid hydrogel beads for various potential applications.

Fabrication of Uniformly Growing Graphene Films via the Dip-Coating Method

2013 ◽  
Vol 320 ◽  
pp. 185-189
Author(s):  
Juan Yang ◽  
Hong Bo Sun ◽  
Dan Li
Keyword(s):  
Sheet Resistance ◽  
Photoelectron Spectroscopy ◽  
Dip Coating ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Graphene Films ◽  
Coating Method ◽  
Dip Coating Method ◽  
Dip Coating Technique

The graphene (GE) films were fabricated in this paper through the deposition of graphene oxide (GO) sheets onto the quartz slide by means of dip-coating technique, followed by thermal annealing. The growth process and transmittance of the film were monitored by ultraviolet and visible spectrophotometer (UV-Vis), the surface morphology and structure were investigated by Atomic force microscopy (AFM), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman. The sheet resistance of the film was also tested and results showed that the sheet resistance is about 60 kΩ-1and the transmittance is as high as 81 % (at 550 nm).

Porous SiO2/TiO2 Bilayer Antireflection Coatings with Self-Cleaning Capacity

2011 ◽  
Vol 233-235 ◽  
pp. 2970-2974 ◽  
Author(s):  
Ruo Yu Chen ◽  
Jian Wu Wang ◽  
Hong Ning Wang ◽  
Wei Yao ◽  
Jing Zhong
Keyword(s):  
Methyl Orange ◽  
Mechanical Strength ◽  
Sol Gel ◽  
Dip Coating ◽  
Antireflection Coatings ◽  
Force Microscopy ◽  
Atomic Force ◽  
Coating Method ◽  
Self Cleaning ◽  
Dip Coating Method

The porous SiO2/TiO2bilayer antireflection coatings with self-cleaning capacity have been prepared by a sol-gel dip-coating method, the surfactant template, Pluronic F123 (PF123) was added to the sol as a pore generator. The performances of the coatings were analyzed with ultraviolet visible spectrophotometer (UV-Vis), scanning electron microscope (SEM) and atomic force microscopy (AFM). The self-cleaning function of coatings was evaluated by means of photocatalytic degradation of methyl orange in aqueous solution, and mechanical strength of the coatings has also been studied. The results indicate that the average transmittance of porous SiO2/TiO2coating increases by 6% as compared to uncoated glass, the coating has a small particle size, a porous structure and a low roughness. After illuminated by ultraviolet light for 3 h, the 5 mg/L methyl orange can be degraded by 56.5%. In addition, the coating has an excellent mechanical strength.

scholarly journals High carrier mobility in single-crystal PtSe2 grown by molecular beam epitaxy on ZnO(0001)

2D Materials ◽  
2021 ◽  
Author(s):  
Frédéric Bonell ◽  
Alain Marty ◽  
Céline Vergnaud ◽  
Vincent Consonni ◽  
Hanako Okuno ◽  
...  
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
High Mobility ◽  
Structural Quality ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
High Carrier Mobility ◽  
Insulating Substrates

Abstract PtSe2 is attracting considerable attention as a high mobility two-dimensional material with envisioned applications in microelectronics, photodetection and spintronics. The growth of high quality PtSe2 on insulating substrates with wafer-scale uniformity is a prerequisite for electronic transport investigations and practical use in devices. Here, we report the growth of highly oriented few-layers PtSe2 on ZnO(0001) by molecular beam epitaxy. The crystalline structure of the films is characterized with electron and X-ray diffraction, atomic force microscopy and transmission electron microscopy. The comparison with PtSe2 layers grown on graphene, sapphire, mica, SiO2 and Pt(111) shows that among insulating substrates, ZnO(0001) yields films of superior structural quality. Hall measurements performed on epitaxial ZnO/PtSe2 with 5 monolayers of PtSe2 show a clear semiconducting behaviour and a high mobility in excess of 200 cm2V-1s-1 at room temperature and up to 447 cm2V-1s-1 at low temperature.

scholarly journals PEALD grown high-k ZrO-=SUB=-2-=/SUB=- thin films on SiC group IV compound semiconductor

2017 ◽  
Vol 51 (1) ◽  
pp. 133
Author(s):  
Anil G. Khairnar ◽  
Vilas S. Patil ◽  
K.S. Agrawal ◽  
Prerna A. Pandit ◽  
Rahul S. Salunke ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
High Mobility ◽  
Atomic Layer ◽  
Compound Semiconductor ◽  
Group Iv ◽  
Force Microscopy ◽  
Atomic Force ◽  
Layer Deposition ◽  
High K

The study of ZrO2 thin films on SiC group IV compound semiconductor has been studied as a high mobility substrates. The ZrO2 thin films were deposited using the Plasma Enhanced Atomic Layer Deposition System. The thickness of the thin films were measured using ellipsometer and found to be 5.47 nm. The deposited ZrO2 thin films were post deposited annealed in rapid thermal annealing chamber at temperature of 400oC. The atomic force microscopy and x-ray photoelectron spectroscopy has been carried out to study the surface topography and roughness and chemical composition of thin film respectively. DOI: 10.21883/FTP.2017.01.8125

Structure and Properties of Thin Films Consisting of Single Crystalline BaTiO3 Nanocubes

2013 ◽  
Vol 582 ◽  
pp. 149-152 ◽  
Author(s):  
Kenichi Mimura ◽  
Kazumi Kato
Keyword(s):  
Hydrothermal Reaction ◽  
Piezoresponse Force Microscopy ◽  
Dip Coating ◽  
Structure And Properties ◽  
Single Crystalline ◽  
Force Microscopy ◽  
Atomic Force ◽  
Coating Method ◽  
Dip Coating Method ◽  
Ferroelectric Hysteresis

Single crystalline BaTiO3nanocubes, which were synthesized by hydrothermal reaction with organic surfactants and additives, were assembled in order and directly on the substrates by dip-coating method using the dispersed solution. After evaporation of solvent, the orderly assembly of the nanocubes was developed over the large region in about several tens of micrometers square. It can cover whole surface of the substrate. The microstructures of the nanocube assemblies were evaluated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Electrical property of the nanocube-assembled film was characterized by piezoresponse force microscopy (PFM). The d33-V curve showed ferroelectric hysteresis and saturation behaviors under high applied voltage.

Catalytic Sol Assisted Dense Pd/γ-Al2O3 Membrane using Modified Electroless Plating: Effect of Process on Surface Morphology

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
Richa Sharma ◽  
Amit Kumar ◽  
Rajesh K. Upadhyay
Keyword(s):  
Surface Morphology ◽  
Electroless Plating ◽  
Surface Characterization ◽  
Dip Coating ◽  
Hydrogen Separation ◽  
Force Microscopy ◽  
Palladium Membrane ◽  
Palladium Membranes ◽  
Pit Formation ◽  
Atomic Force

Abstract Palladium membranes are considered ideal for high purity hydrogen separation owing to their infinite selectivity to hydrogen. The key to such selectivity depends on the dense surface of the membrane that suggests absolute non-porous surface morphology. However, preparation of dense palladium membranes irrespective of any deposition technique leads to pit formation which makes synthesis of dense palladium membrane challenging. The current study illustrates the application of electroless plating assisted with novel catalytic sol pre-coating to prepare dense Pd membranes. The surface characterization using field emission scanning electron microscope (FESEM) and atomic force microscopy (AFM) were performed to identify the gaps between dip coating and electroless plating. It was observed that with the use of a dip coated catalytic sol, thinner and well dispersed Pd deposits could be prepared. The porosity of deposited Pd layers does not affect the essential densification property as sol surface underneath dispersed Pd remains dense.

Deposition mechanism of nanostructured thin films from tetrafluoroethylene glow discharges

2005 ◽  
Vol 77 (2) ◽  
pp. 399-414 ◽  
Author(s):  
A. Milella ◽  
F. Palumbo ◽  
P. Favia ◽  
G. Cicala ◽  
R. d’Agostino
Keyword(s):  
Thin Films ◽  
Film Growth ◽  
Water Repellency ◽  
High Water ◽  
Experimental Conditions ◽  
Deposition Mechanism ◽  
Force Microscopy ◽  
Glow Discharges ◽  
Atomic Force ◽  
Surface Migration

Nanostructured polytetrafluoroethylene (PTFE)-like thin films can be deposited, in certain experimental conditions, by modulated discharges fed with tetrafluoroethylene (TFE). These coatings are characterized by a unique morphology consisting of highly twisted micron-long ribbons, which leads to an extremely high water repellency of the surface. In the present work, the diagnostics of the plasma phase is presented, coupled with that of the coating, in order to understand the film growth mechanism in different discharge regimes. When the duty cycle (DC) is increased in modulated C2F4 plasmas, the monomer depletion increases, too, and many recombination reactions take place at progressively higher rates, resulting in the formation of CF4, C2F6, C3F6, C3F8, and C4F10; the formation of powders in the homogeneous phase, however, was never evidenced. The modulation of C2F4 plasmas strongly affects the morphology of the resulting coating, as revealed by atomic force microscopy (AFM), ranging from bumpy to ribbon-like structures. The latter, moreover, are found to be more PTFE-like with respect to the remaining part of the film. In the last part of the paper, a deposition mechanism is proposed, where low radical densities in the plasma and surface migration of the precursors are the keys for the growth of ribbon-like structures.

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