Effect of Chemically Engineered Au/Ag Nanorods on the Optical and Mechanical Properties of Keratin Based Films

Gambucci, Marta; Aluigi, Annalisa; Seri, Mirko; Sotgiu, Giovanna; Zampini, Giulia; Donnadio, Anna; Torreggiani, Armida; Zamboni, R.; Latterini, Loredana; Posati, Tamara

doi:10.3389/fchem.2020.00158

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…The coating slightly increases the average size of the nanorods, depositing a layer of about 3.9 nm around the AuNRs (Figure 1b-inset and Table 1). The presence of the silver layer also affects the extinction spectrum of the material; the plasmon bands shift towards lower wavelengths (480 and 522 nm) and partially overlap (Figure 1d, red line), as previously reported in the literature [28,29].…”

Section: Synthesis and Characterization Of Bimetallic Core-shell Nanosupporting

confidence: 81%

Multilayer Gold-Silver Bimetallic Nanostructures to Enhance SERS Detection of Drugs

et al. 2020

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Surface-enhanced Raman scattering (SERS) is a widely used technique for drug detection due to high sensitivity and molecular specificity. The applicability and selectivity of SERS in the detection of specific drug molecules can be improved by gathering information on the specific interactions occurring between the molecule and the metal surface. In this work, multilayer gold-silver bimetallic nanorods (Au@Ag@AuNRs) have been prepared and used as platforms for SERS detection of specific drugs (namely promethazine, piroxicam, furosemide and diclofenac). The analysis of SERS spectra provided accurate information on the molecular location upon binding and gave some insight into molecule-surface interactions and selectivity in drug detection through SERS.

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Section: Synthesis and Characterization Of Bimetallic Core-shell Nanosupporting

confidence: 81%

Multilayer Gold-Silver Bimetallic Nanostructures to Enhance SERS Detection of Drugs

et al. 2020

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“…More recently it was observed that the addition of nanoparticles as integrated element in composite materials can provide a significant improvement of their characteristics [1][2][3][4][5][6]. Indeed, the operation of these new materials relies on the peculiar properties of metal nanoparticles, such as mechanical, electronic, and optical ones [7][8][9][10][11]. Among all metal nanoparticles, Ag nanoparticles have attracted the attention of researchers for their numerous biological activities [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…More recently it was observed that the addition of nanoparticles as integrated element in composite materials can provide a significant improvement of their characteristics [ 1 , 2 , 3 , 4 , 5 , 6 ]. Indeed, the operation of these new materials relies on the peculiar properties of metal nanoparticles, such as mechanical, electronic, and optical ones [ 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite Functionalized Calcium Carbonate Composites with Ag Nanoparticles: An Integrated Characterization Study

et al. 2021

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In the present work, composite materials very promising for biomedical and pharma-ceutical applications were investigated. They are composed of silver nanoparticles (Ag NPs) in a matrix constituted of calcium carbonate functionalized with hydroxyapatite (HA-FCC). The composites were obtained by different synthesis methods, starting from a mixture of the silver acetate with HA-FCC (using adsorption or mixing in wet conditions methods) and then treating them by exposure to visible light or calcination to promote the silver reduction; a synthetic procedure based on ultrasound-assisted reduction with NaBH4 or citrate was also carried out. The characterization by X-ray photoelectron spectroscopy and reflected electron energy loss spectroscopy analysis also involved the reference sample of HA-FCC matrix. Then the morphology of the Ag NPs and the crystalline structure of HA-FCC were studied by transmission electron microscopy and X-ray diffraction, respectively. To assess the effectiveness of the different methods on silver reduction, the Auger parameters α’ were calculated and compared. The use of this methodology based on the Auger parameter is neither trivial nor ordinary. We demonstrate its validity since the different values of this parameter allow to identify the oxidation state of silver and consequently to evaluate the formation yield of metallic Ag NPs in the HA-FCC matrix and the effectiveness of the different reduction methods used.

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“…Wool waste discarded during shearing and weaving used to serve as low-value feed additives, cosmetic ingredients, wastewater treatment agents, and biomaterials. , Considering the fact that keratin accounts for the majority of wool (>90%), , wool waste has richly deserved high add-on value applications like regular wool. In this context, regenerated fibers and films made out of keratin from wool waste have attracted intensive research interests. − …”

Section: Introductionmentioning

confidence: 99%

Continuous High-Content Keratin Fibers with Balanced Properties Derived from Wool Waste

Cao

Rong

Zhang

2020

ACS Sustainable Chem. Eng.

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The full utilization of discarded wool for the preparation of continuous recycled keratin fibers has been a challenging subject. The key issue lies in how to utilize wool keratin as much as possible without damaging the main chain structure of the protein molecules. Based on small molecule simulation reactions, the authors find out that disulfide bonds, the only cross-linking bonds in keratin, can be effectively broken by starch-derived dithiothreitol, and the resultant keratin can be well separated by the cosmetic ingredient sodium dodecyl sulfate, which forms micelles that stabilize the keratin solution. Accordingly, the traditional strong hydrogen-bond breakers like urea and LiBr can no longer be used, which helps to protect the integrity of keratin. The resultant fully dissolved, highly concentrated keratin solution (keratin content = 18 wt %) is directly applied for wet spinning. To toughen and strengthen the envisaged keratin fibers, a few hydroxypropyl cellulose and glutaraldehyde and 4,4′methylenebis(phenyl isocyanate) are incorporated. Eventually, the regenerated continuous fibers with keratin content as high as 90 wt % offer a combination of properties similar to natural wool.

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Effect of Chemically Engineered Au/Ag Nanorods on the Optical and Mechanical Properties of Keratin Based Films

Cited by 6 publications

References 38 publications

Multilayer Gold-Silver Bimetallic Nanostructures to Enhance SERS Detection of Drugs

Multilayer Gold-Silver Bimetallic Nanostructures to Enhance SERS Detection of Drugs

Hydroxyapatite Functionalized Calcium Carbonate Composites with Ag Nanoparticles: An Integrated Characterization Study

Continuous High-Content Keratin Fibers with Balanced Properties Derived from Wool Waste

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