Films based on proteins and polysaccharides: Preparation and physical–chemical characterization

Guerrero, Pedro; Garrido, Tania; Leceta, I.; Caba, Koro de la

doi:10.1016/j.eurpolymj.2013.08.014

Cited by 114 publications

(47 citation statements)

References 30 publications

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“…neutron capture cross sections and weak β-decay rates (Cristallo et al 2015b). While a great effort has been made by the nTOF collaboration to derive experimental neutron capture cross sections (Guerrero et al 2013), weak rates are still frozen to the compilation by Takahashi & Yokoi (1987). A systematic theoretical (and/or experimental) study of those rates might significantly improve our knowledge of many s-process branchings.…”

Section: The Global Picturementioning

confidence: 99%

Chemical evolution with rotating massive star yields – I. The solar neighbourhood and the s-process elements

Prantzos

Abia

Limongi

et al. 2018

Monthly Notices of the Royal Astronomical Society

317

473

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We present a comprehensive study of the abundance evolution of the elements from H to U in the Milky Way halo and local disk. We use a consistent chemical evolution model, metallicity dependent isotopic yields from low and intermediate mass stars and yields from massive stars which include, for the first time, the combined effect of metallicity, mass loss and rotation for a large grid of stellar masses and for all stages of stellar evolution. The yields of massive stars are weighted by a metallicity dependent function of the rotational velocities, constrained by observations as to obtain a primary-like 14 N behavior at low metallicity and to avoid overproduction of s-elements at intermediate metallicities. We show that the solar system isotopic composition can be reproduced to better than a factor of two for isotopes up to the Fe-peak, and at the 10% level for most pure s-isotopes, both light ones (resulting from the weak s-process in rotating massive stars) and the heavy ones (resulting from the main s-process in low and intermediate mass stars). We conclude that the light element primary process (LEPP), invoked to explain the apparent abundance deficiency of the s-elements with A< 100, is not necessary. We also reproduce the evolution of the heavy to light s-elements abundance ratio ([hs/ls]) -recently observed in unevolved thin disk stars -as a result of the contribution of rotating massive stars at sub-solar metallicities. We find that those stars produce primary F and dominate its solar abundance and we confirm their role in the observed primary behavior of N. In contrast, we show that their action is insufficient to explain the small observed values of 12 C/ 13 C in halo red giants, which is rather due to internal processes in those stars.

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Section: The Global Picturementioning

confidence: 99%

Chemical evolution with rotating massive star yields – I. The solar neighbourhood and the s-process elements

Prantzos

Abia

Limongi

et al. 2018

Monthly Notices of the Royal Astronomical Society

317

473

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“…Biopolymers' sensitivity to water and mechanical weakness are the biggest obstacles against replacing synthetic polymers with biopolymers. Mixing biopolymers with proteins (Zolfi et al 2014), carbohydrates (Motedayen et al 2013;Koch et al 2010), various combinations of several proteins and carbohydrates (Guerrero et al 2013;Arvanitoyannis et al 1998), lipids (Kowalczyk and Baraniak 2014;Shih et al 2011) and nano fillers (Almasi et al 2010;Shahabi-Ghahfarrokhi et al 2015b) are the common methods to overcome the drawbacks of biopolymers.…”

Section: Introductionmentioning

confidence: 99%

Modification of functional properties of pullulan–whey protein bionanocomposite films with nanoclay

2015

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In this study, biodegradable nanocomposite film composed of pullulan -whey protein isolate (WPI) -montmorillonite (MMT) were developed and characterized as a function of incorporating various amounts of MMT nanoparticles (0, 1, 3 and 5 % wt). Results showed that the watervapor permeability, moisture content, moisture absorption and water solubility decreased when the nano-MMT content was increased. Tensile strength improved and elongation at break simultaneously decreased with increasing MMT content. The glass transition temperature (T g (and melting-point temperature (T m ) increased with increasing nano-MMT content. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis revealed uniform distribution of MMT into the polymer matrix. Atomic force microscopy (AFM) showed enhancement of films' roughness with increasing MMT content.

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“…As shown in Fig. 3B, the C1s spectrum can be fitted into three peaks located at 284.8, 286.1, and 288 eV, which should be ascribed to C-H/C-C, C-N/ C-O, and C=O bonds, respectively [37][38][39]. The O1s spectrum seems to be wide and asymmetric (Fig.…”

Section: Surface Chemical Composition Analysismentioning

confidence: 91%

“…3C), implying that there are at least two kinds of chemical Recyclable Ag@AgBr-gelatin film states. The asymmetric peak can be fitted into three peaks located at 531.3, 532.0, and 532.9 eV, ascribed to O=C-N, C-OH, and water, respectively [37,38]. The symmetric peak at 399.9 eV is ascribed to the N in peptide chain of gelatin [39].…”

Section: Surface Chemical Composition Analysismentioning

confidence: 97%

Recyclable Ag@AgBr-gelatin film with superior visible-light photocatalytic activity for organic degradation

Zhu

Teng

et al. 2015

Res Chem Intermed

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Recyclable Ag@AgBr-gelatin film was fabricated by a versatile route, i.e., embedding Ag@AgBr grains into gelatin matrix, constructing 3D network structures via the cross-linking reaction between gelatin and cross-linking agent 1,3-bis(vinylsulfonyl) propanol, and forming Ag@AgBr-gelatin film on the nylon mesh. The microstructures and chemical compositions of the obtained films were analyzed by the means of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermo gravimetry/differential thermal analyzer, and Fourier transform infrared spectroscopy. It was revealed that the 3D network structure was formed via the cross-linking reaction between gelatin and cross-linking agent 1,3-bis(vinylsulfonyl) propanol (BVP). Photocatalytic degradation of methyl orange indicated that Ag@AgBr-gelatin film exhibited excellent visible-light photocatalytic activity and recyclability, due to the reason that the 3D networks can Jing Zhu and Changjiang Li have contributed equally to this work and should be considered co-first authors.Electronic supplementary material The online version of this article (efficiently fix Ag@AgBr but hardly hinder the transmissions of reactants and degradation products. The adhesion fastness of Ag@AgBr-gelatin film on nylon mesh enhances with increasing the dosage of cross-linking agent BVP, and the lower limit of BVP dosage for forming unbroken film is 0.02 g/m 2 . Excessive crosslinking would make gelatin network structure too denser, resulting in the decline of photocatalytic activity.

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Films based on proteins and polysaccharides: Preparation and physical–chemical characterization

Cited by 114 publications

References 30 publications

Chemical evolution with rotating massive star yields – I. The solar neighbourhood and the s-process elements

Chemical evolution with rotating massive star yields – I. The solar neighbourhood and the s-process elements

Modification of functional properties of pullulan–whey protein bionanocomposite films with nanoclay

Recyclable Ag@AgBr-gelatin film with superior visible-light photocatalytic activity for organic degradation

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