Antifungal vanillin–imino-chitosan biodynameric films

Marin, Luminița; Stoica, Iuliana; Mareș, Mihai; Dinu, Maria Valentina; Simionescu, Bogdan C.; Barboiu, Mihail

doi:10.1039/c3tb20558d

Cited by 72 publications

(56 citation statements)

References 44 publications

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“…Representative POM images are presented in Fig. As was expected, the thermotropic behaviors of the samples which show melting/crystallization process in POM (2, 3, 7, 8,9,12) is confirmed by DSC thermograms by the appearance of an endothermic peak during the heating and an exothermic peak during the cooling scan, respectively. To better understand the thermal behavior of the studied samples, Differential Scanning Calorimetry starting from -50 o C up to 10 o C higher temperature than melting point as was determined by POM, has been performed (Fig.…”

Section: -Nitrosupporting

confidence: 72%

“…All the other specific bands are present in the FTIR spectra. In the FTIR spectra of the compounds containing an -OH group in para position to the Schiff base unit (1,6,11) the phenoxy band appears even more shifted, around 1285 cm -1 , exhibiting a significant displacement of approximately 35 cm -1 , indicative of the intermolecular hydrogen bonding of phenol groups [9]. While usually the ether band appears around 1250 cm -1 , FTIR spectra of the compounds containing crown ether substituents (11,12,13,14,15) show this band appearing around 1265 cm -1 , indicative of the macrocyclic effect, consisting in diminishing their vibration modes.…”

Section: -Nitromentioning

confidence: 99%

“…12). By correlating the evolution of the crystalline state with crystallization temperature it can be noted that the crystalline samples obtained during the cooling scan at higher temperature (2, 7, 12) broke at room temperature during the time, while the compound samples which crystallized at lower temperature (3,8,9) formed a crystalline state without cracks. Excepting the compound 10, all the samples exhibit in POM slow crystallization at room temperature (1,4,5,6) showing a typical behavior for molecular amorphous glasses.…”

Section: -Nitromentioning

confidence: 99%

“…The absorption maxima are red shifted as the number of fussed rings into the imine structure increases (Table 3). Thus, the nonplanar vanillin and anthracene containing imines (1,4,6,9,11,14) emitted blue light, whilst the compounds with stabilized planar structure by intramolecular H-bonding (and thus extent conjugation) (2, 3, 7, 8, 12, 13) emitted green light. Photoluminescence spectra of the studied imines have been measured in diluted acetonitrile solutions and films, by exciting with light using a wavelength corresponding to the absorption maxima.…”

Section: Uv-vis and Fluorescence Propertiesmentioning

confidence: 99%

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Molecular amorphous glasses toward large azomethine crystals with aggregation-induced emission

et al. 2015

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Fifteen azomethine compounds based on different rigid cores and soft aliphatic tails have been designed and synthesized to generate variable supramolecular architectures with distinct thermotropic, photophysical and electrochemical properties. Ten out of the fifteen imines were grown as single crystals and their molecular structures and supramolecular architectures were obtained by single crystal X-ray diffraction. The thermotropic behavior was monitored by polarized light microscopy and differential scanning calorimetry. Photophysical properties were studied by UV-vis and photoluminescence spectroscopy and electrochemical properties by cyclic voltammetry. It was demonstrated that all supramolecular architectures with are mostly generated via weak π-π or van der Waals interactions between the rigid cores, that prompts the synthesis of molecular glasses, further giving rise of large crystals displaying the aggregation induced emission (AIE) effect. We conclude that there is a close relationship between the imine molecular structures and their ability to promote favorable properties for opto-electronic applications. ExperimentalMaterials and methods: Vanillin 97%, 2-hydroxy 5nitrobenzaldehyde 99%, 2-Hydroxy-1-naphthaldehyde 95%, 9antracenaldehyde 97%, 1-pyren aldehyde, 4-butylaniline 97%, 4-octylaniline 99%, 4'-aminobenzo-15-Crown-5 97% as well as

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Section: -Nitrosupporting

confidence: 72%

Section: -Nitromentioning

confidence: 99%

Section: -Nitromentioning

confidence: 99%

Section: Uv-vis and Fluorescence Propertiesmentioning

confidence: 99%

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Molecular amorphous glasses toward large azomethine crystals with aggregation-induced emission

et al. 2015

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“…Atualmente, as indústrias que usam quitina ou quitosana convergem na geração de produtos de alto valor econômico, tais como: cosméticos, aditivos alimentares, membranas semipermeáveis (SILVA et al, 2006) e também como suporte de medicamentos (ALVES; MANO, 2008;DE FÁVERE, 2009;MARIN et al, 2013;MONIER et al, 2012ab;SHAHIDI et al, 1999;SILVA et al, 2006;WALTER, 1998 Goosen (1997) relatam que as maiores aplicações de quitosana estão concentradas na indústria alimentícia, na agricultura, nas indústrias de cosméticos, têxteis e farmacêuticas, na medicina (AZEVEDO et al, 2007;WANG et al, 2012), medicina veterinária, na produção de materiais cirúrgicos, na redução de níveis corporais de colesterol e gorduras, na modificação de eletrodos (JINRUI; BIN, 1994), na inibição de algumas células cancerígenas, bem como em tratamento de águas e efluentes (SHAHIDI et al, 1999), com quelação de íons metálicos em níveis de até 1,0 ppb, pois a quitosana apresenta alta densidade de carga e grupos funcionais propícios para modificações (CHATELET et al, 2001;SANTOS et al, 2003;SHAHIDI et al,1999).…”

Section: Aplicaçõesunclassified

Preparação e caracterização de bases de Schiff e complexos metálicos a partir de quitosana e derivados de salicilaldeído

Araújo¹

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Combining Vapor Phase Polymerization and Screen Printing for Printed Electronics on Flexible Substrates

Brooke

Wijeratne

Hübscher

et al. 2022

Adv Materials Technologies

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and have led to several commercial products such as inks, sensors, and displays.Conductive polymers can be synthesized by several methods, each with their own set of advantages and disadvantages. Chemical polymerization is the simplest method, requiring only the reagents necessary for the polymerization and a container, but generally results in poor properties. Electrochemical polymerization is a more controlled polymerization method (via the voltage and current), but requires a problematic three-electrode set up when considering large areas and upscaling. One polymerization technique that has shown promise, both for resulting in good conductive polymer properties and the potential for large area manufacturing, is vapor phase polymerization (VPP). [3,4] VPP uses a liquid oxidant that polymerizes a vapor monomer. The oxidant can be deposited using many different techniques, the most common method is spin coating, which results in very smooth and homogenous layers. [5][6][7][8] Performing VPP on spin-coated oxidant films has been shown to provide conductive polymers of impressive electronic properties and relatively large scale (10 cm 2 ). [9,10] However, its ability to coat one substrate at a time and the material waste makes spin coating unsuitable for hundreds of devices or truly large scale (≈dm 2 − m 2 ).Various deposition methods of the oxidant followed by VPP have been published to push the resolution of patterns possible via dip pen lithography [11] or for increasing the possibility for largescale manufacturing via inkjet printing. [12] However, truly scalable conductive polymer films fabricated by VPP have yet to be shown.Screen printing is one industrial standard deposition technique that can be truly scalable in either a sheet-by-sheet or roll-to-roll process. This technique allows pattern resolutions of at least 100 µm (with 100 µm spacing) and the ink deposition is performed within seconds. Screen printing has been used extensively for display, [13] sensor, [14] energy storage, [15] and transistor [16] applications due to the ability of over-printability, alignment at high accuracy, and registration marks allowing layer-by-layer deposition of functional inks.The combination of screen printing and the VPP process will permit all-printed devices to be fabricated at high resolution, which opens the possibilities of commercialization due to the cost-effective deposition technique. Previous reports combining Large area manufacturing of printed electronic components on ~A4-sized substrates is demonstrated by the combination of screen printing and vapor phase polymerization (VPP) into poly(3,4-ethylenedioxythiophene) (PEDOT).The oxidant layer required for the polymerization process is screen printed, and the resulting conductive polymer patterns are manufactured at high resolution (100 µm). Successful processing of several common oxidant species is demonstrated, and the thickness can be adjusted by altering the polymerization time. By comparing the polymer films of this work to a commercial PEDOT:PSS (PEDOT d...

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Antifungal vanillin–imino-chitosan biodynameric films

Cited by 72 publications

References 44 publications

Molecular amorphous glasses toward large azomethine crystals with aggregation-induced emission

Molecular amorphous glasses toward large azomethine crystals with aggregation-induced emission

Preparação e caracterização de bases de Schiff e complexos metálicos a partir de quitosana e derivados de salicilaldeído

Combining Vapor Phase Polymerization and Screen Printing for Printed Electronics on Flexible Substrates

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