scholarly journals An Industrial Scale Synthesis of Adipicdihydrazide (ADH)/Polyacrylate Hybrid with Excellent Formaldehyde Degradation Performance

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 86 ◽  
Author(s):  
Rui Zhu ◽  
Renjie Chen ◽  
Yunxia Duo ◽  
Saigang Zhang ◽  
Delong Xie ◽  
...  
Keyword(s):  
Hybrid Film ◽  
Film Formation ◽  
Industrial Scale ◽  
Hybrid Films ◽  
Excellent Performance ◽  
Formaldehyde Removal ◽  
Mapping Analysis ◽  
Formaldehyde Degradation ◽  
Polymer Latex ◽  
Scanning Electron

A simple and versatile route for industrial scale synthesis of adipicdihydrazide (ADH)/polymer hybrids with excellent performance of formaldehyde degradation is proposed in this paper. The ADH compound is uniformly dispersed in poly(methyl methacrylate-butyl acrylate-methacrylic acid) (P(MMA-BA-MAA)) latex, which is validated by UV and dispersibility tests. The results illustrate that ADH has excellent compatibility and dispersion stability without affecting the film formation of the polymer latex. Furthermore, scanning electron microscope (SEM) and mapping analysis of the hybrid films also demonstrate that ADH is homogenously dispersed in the polymer matrix. Compared with neat polymers, the thermal properties of hybrid films are improved, for example, T0.5 increases by 8.3 °C. According to qualitative tests of the 4-amino-3-hydrazino-5-mercapto-1,2,4-triazol-red/green/blue (AHMT-RGB) method, the hybrid films demonstrate high formaldehyde removal efficiency. On the basis of the semi-quantitative test of Fourier Transform infrared spectroscopy (FTIR) measurements, the rate of formaldehyde degradation can reach 1.034 × 102 mol/(h·m3) for the hybrid film with 5 wt% ADH.

scholarly journals Carbon Nanotube and Cellulose Nanocrystal Hybrid Films

Molecules ◽  
2019 ◽  
Vol 24 (14) ◽  
pp. 2662 ◽  
Author(s):  
Mingzhe Jiang ◽  
Robert Seney ◽  
Paul Charles Bayliss ◽  
Christopher L. Kitchens
Keyword(s):  
Electrical Conductivity ◽  
High Performance ◽  
Hybrid Film ◽  
Network Formation ◽  
Film Formation ◽  
Device Fabrication ◽  
Hybrid Films ◽  
Multiwalled Nanotubes ◽  
Anisotropic Nanomaterials ◽  
Surface Modified

The use of cellulose nanocrystals (CNC) in high performance coatings is attractive for micro-scale structures or device fabrication due to the anisotropic geometry, however CNC are insulating materials. Carbon nanotubes (CNT) are also rod-shaped nanomaterials that display high mechanical strength and electrical conductivity. The hydrophobic regions of surface-modified CNC can interact with hydrophobic CNT and aid in association between the two anisotropic nanomaterials. The long-range electrostatic repulsion of CNC plays a role in forming a stable CNT and CNC mixture dispersion in water, which is integral to forming a uniform hybrid film. At concentrations favorable for film formation, the multiwalled nanotubes + CNC mixture dispersion shows cellular network formation, indicating local phase separation, while the single-walled nanotube + CNC mixture dispersion shows schlieren texture, indicating liquid crystal mixture formation. Conductive CNT + CNC hybrid films (5–20 μm thick) were cast on glass microscope slides with and without shear by blade coating. The CNT + CNC hybrid films electrical conductivity increased with increasing CNT loadings and some anisotropy was observed with the sheared hybrid films, although to a lesser extent than what was anticipated. Percolation models were applied to model the hybrid film conductivity and correlate with the hybrid film microstructure.

Ordered porous structure hybrid films generated by breath figures for directional water penetration

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88471-88476 ◽  
Author(s):  
Tianqi Guo ◽  
Keyu Han ◽  
Liping Heng ◽  
Moyuan Cao ◽  
Lei Jiang
Keyword(s):  
Porous Structure ◽  
Hybrid Film ◽  
Hybrid Films ◽  
Substrate Roughness ◽  
Water Penetration ◽  
Breath Figures ◽  
Ordered Porous

A highly ordered open-pore hybrid film was fabricated by controlling the substrate roughness and wettability. The composite with different wettability on the two side resulted in an attractive unidirectional water-penetration function (see figure).

scholarly journals Physico-Chemical Characterization and Antimicrobial Properties of Hybrid Film Based on Saponite and Phloxine B

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 325
Author(s):  
Nitin Chandra teja Dadi ◽  
Matúš Dohál ◽  
Veronika Medvecká ◽  
Juraj Bujdák ◽  
Kamila Koči ◽  
...  
Keyword(s):  
Hybrid Film ◽  
Antimicrobial Properties ◽  
Chemical Characterization ◽  
Layered Silicate ◽  
Contact Angles ◽  
Exchange Capacity ◽  
Resistant Bacteria ◽  
Hybrid Films ◽  
Water Contact ◽  
Physico Chemical

This research was aimed at the preparation of a hybrid film based on a layered silicate saponite (Sap) with the immobilized photosensitizer phloxine B (PhB). Sap was selected because of its high cation exchange capacity, ability to exfoliate into nanolayers, and to modify different surfaces. The X-ray diffraction of the films confirmed the intercalation of both the surfactant and PhB molecules in the Sap film. The photosensitizer retained its photoactivity in the hybrid films, as shown by fluorescence spectra measurements. The water contact angles and the measurement of surface free energy demonstrated the hydrophilic nature of the hybrid films. Antimicrobial effectiveness, assessed by the photodynamic inactivation on hybrid films, was tested against a standard strain and against methicillin-resistant bacteria of Staphylococcus aureus (MRSA). One group of samples was irradiated (green LED light; 2.5 h) and compared to nonirradiated ones. S. aureus strains manifested a reduction in growth from 1-log10 to over 3-log10 compared to the control samples with Sap only, and defects in S. aureus cells were proven by scanning electron microscopy. The results proved the optimal photo-physical properties and anti-MRSA potential of this newly designed hybrid system that reflects recent progress in the modification of surfaces for various medical applications.

An overview of polymer latex film formation and properties

2000 ◽  
Vol 86 (3) ◽  
pp. 195-267 ◽  
Author(s):  
P.A. Steward ◽  
J. Hearn ◽  
M.C. Wilkinson
Keyword(s):  
Film Formation ◽  
Latex Film ◽  
Latex Film Formation ◽  
Polymer Latex

scholarly journals Chiral platinum–polypyrrole hybrid films as efficient enantioselective actuators

2019 ◽  
Vol 55 (73) ◽  
pp. 10956-10959 ◽  
Author(s):  
Sunpet Assavapanumat ◽  
Bhavana Gupta ◽  
Gerardo Salinas ◽  
Bertrand Goudeau ◽  
Chularat Wattanakit ◽  
...  
Keyword(s):  
Hybrid Film ◽  
Hybrid Films ◽  
Mesoporous Platinum

A hybrid film composed of chiral encoded mesoporous platinum and polypyrrole shows differential wireless actuation as a function of the chiral nature of an enantiomer present in solution.

Esem Study of Film Formation in Latices Polymerised in Presence of Starch

1998 ◽  
Vol 4 (S2) ◽  
pp. 286-287
Author(s):  
N. Stelmashenko ◽  
A.M. Donald
Keyword(s):  
Lower Cost ◽  
Film Formation ◽  
Environmental Scanning ◽  
The Novel ◽  
Maize Starch ◽  
Waxy Maize ◽  
Glass Slides ◽  
Film Forming ◽  
Industrial Relevance ◽  
Scanning Electron

The Environmental Scanning Electron Microscope (ESEM) was used to study film-formation in vinyl latices polymerised in the presence of varying amount and type of starch. An understanding of the effect of native biopolymers on film forming mechanisms in latex has technological and industrial relevance because it can lead to the creation of novel latices with potentially lower cost and improved biosustainability.Film formation studies were carried out on a range of samples selected by ICI Paints as the most promising candidates for the novel latices. These included vinyl latices polymerised with 2 - 15% of potato and waxy maize starch, taken either in native or modified. Normally, no surfactants were used during latex polymerisation; a few samples were prepared for comparative purposes when polymerisation was carried out both with and without the addition of surfactant. Latex films were spun-cast on glass slides before insertion into the microscope.

Novel Bionic Biomembrane Supported by Gold Nanoparticles/Cellulose Hybrid Films

2012 ◽  
Vol 84 ◽  
pp. 13-18 ◽  
Author(s):  
Zhi Ming Liu ◽  
Yuan Lin An ◽  
Wen Jian Wu
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Lipid Membranes ◽  
Hybrid Film ◽  
Bilayer Lipid Membranes ◽  
Hybrid Films ◽  
Bilayer Lipid ◽  
Long Period ◽  
Highly Active ◽  
The Stability

As one of the main methods to study biomembranes, the construction of highly active bionic biomembrane systems is very important. Based on the hybrid film of gold nanoparticles and cellulose, a novel system of bionic biomembrane is demonstrated. The ratio effects of lecithin to cholesterin on the stability of bilayer lipid membranes are studied. Lipid solutions that can form stable membranes in the air and in some aqueous solutions are prepared. The bionic biomembranes composed of bilayer lipid membranes and hybrid films of gold nanoparticles and cellulose can be sustained for a long period in aqueous solutions. The bionic biomembranes also exhibit some interesting electrochemical properties.

scholarly journals Penetration of Different Impression Materials into Exposed Dentinal Tubules during the Impression Procedure

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1321 ◽  
Author(s):  
Bruna Sinjari ◽  
Gianmaria D’Addazio ◽  
Edit Xhajanka ◽  
Sergio Caputi ◽  
Giuseppe Varvara ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fractal Dimensions ◽  
Excellent Performance ◽  
Dentinal Tubules ◽  
Impression Materials ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
The Mean ◽  
Scanning Electron

Adhesive restorations have been shown to guarantee excellent performance and longevity, although this comes with some disadvantages. Among these, the vulnerability of dentine to different agents has been widely evaluated. The aim of this study was to evaluate the possible penetration of impression materials into freshly cut dentine. Dentine from 27 teeth was impressed with polyether (Impregum Penta L) (nine teeth) and with polyvinyl siloxane (Aquasil Ultra LV) (nine teeth). The surface of nine teeth after the impressions were used as the control. Specifically, the extroflections caused by the imprinting of the dentinal tubules on the impression material, the so-called impression tags, were measured. Furthermore, the presence of the material inside the tubules was examined. Scanning electron microscopy analysis showed material tags for all of the experimental groups. The mean lengths (±SD) were 22.6 (±11.0) µm for polyether, 21.8 (±12.8) µm for polyvinyl siloxane and 11.3 (±7.0) µm for the tooth control, with mean diameters (±SD) of 2.8 (±0.5), 2.4 (±0.7) and 3.1 (±0.7) µm, respectively. Fractal analysis showed fractal dimensions of 1.78 (±0.03), 1.77 (±0.03) and 1.71 (±0.03), respectively. These data demonstrated that the impression materials can remain inside the dentinal tubules, which can adversely affect the adhesive procedures.

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