Direct Conjugation of Resveratrol on Hydrophilic Gold Nanoparticles: Structural and Cytotoxic Studies for Biomedical Applications

Strongly hydrophilic gold nanoparticles (AuNPs), functionalized with citrate and L-cysteine, were synthetized and used as Resveratrol (RSV) vehicle to improve its bioavailability. Two different conjugation procedures were investigated: the first by adding RSV during AuNPs synthesis (1) and the second by adding RSV after AuNPs synthesis (2). The two different conjugated systems, namely AuNPs@RSV1 and AuNPs@RSV2 respectively, showed good loading efficiency (η%): η1 = 80 ± 5% for AuNPs@RSV1 and η2 = 20 ± 3% for AuNPs@RSV2. Both conjugated systems were investigated by means of Dynamic Light Scattering (DLS), confirming hydrophilic behavior and nanodimension (<2RH> 1 = 45 ± 12 nm and <2RH> 2 = 170 ± 30 nm). Fourier Transform Infrared Spectroscopy (FT-IR), Synchrotron Radiation induced X-Ray Photoelectron Spectroscopy (SR-XPS) and Near Edge X-ray Absorption Fine Structure (NEXAFS) techniques were applied to deeply understand the hooking mode of RSV on AuNPs surface in the two differently conjugated systems. Moreover, the biocompatibility of AuNPs and AuNPs@RSV1 was evaluated in the concentration range 1.0–45.5 µg/mL by assessing their effect on breast cancer cell vitality. The obtained data confirmed that, at the concentration used, AuNPs do not induce cell death, whereas AuNPs@RSV1 maintains the same anticancer effects as the unconjugated RSV.

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Incorporation of Gold Nanoparticles Within Thermoresponsive Microgel Particles: Effect of Crosslinking Density

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.18383 ◽

2008 ◽

Vol 8 (12) ◽

pp. 6283-6289

Author(s):

Yang Dong ◽

Ying Ma ◽

Tianyou Zhai ◽

Yi Zeng ◽

Hongbing Fu ◽

...

Keyword(s):

Gold Nanoparticles ◽

Photoelectron Spectroscopy ◽

Trisodium Citrate ◽

Crosslinking Density ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Microgel Particles ◽

One Step ◽

Ft Ir

Hybrid microgel particles were prepared by one step incubation of poly(N-isopropylacrylamide)-co-poly(acrylic acid) (PNIPAM-co-PAA) and gold nanoparticles (AuNPs). PNIPAM-co-PAA microgel particles were synthesized by surfactant-free emulsion polymerization with different crosslinking densities (4.5 wt.-%, 10 wt.-%, 15 wt.-%, MBA to NIPAM) and AuNPs obtained by trisodium citrate reduction method independently. The effect of crosslinking density of synthesized microgel particles on the loadings of AuNPs was investigated. The results showed that 18±2 nm AuNPs could be well entrapped in the loosely crosslinked (4.5 wt.-%, MBA to NIPAM) PNIPAM-co-PAA microgel particles with high loadings. The final hybrid microgel particles were well characterized by transmission electron microscopy (TEM), UV-vis spectra, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and FT-IR. In particular, the PNIPAM-co-PAA/AuNPs hybrid microgel particles were thermoresponsive and completely reversible with several heating/cooling cycles. Therefore, the PNIPAM-co-PAA/AuNPs hybrid microgel particles allow for combined surface plasmon and thermal switching applications.

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Unveiling the Complex Redox Reactions of SnO2 in Li-Ion Batteries Using Operando X-ray Photoelectron Spectroscopy and In Situ X-ray Absorption Spectroscopy

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c17936 ◽

2021 ◽

Vol 13 (2) ◽

pp. 2547-2557

Author(s):

Marta Mirolo ◽

Xiaohan Wu ◽

Carlos A. F. Vaz ◽

Petr Novák ◽

Mario El Kazzi

Keyword(s):

Absorption Spectroscopy ◽

Photoelectron Spectroscopy ◽

Redox Reactions ◽

Li Ion Batteries ◽

X Ray ◽

Li Ion ◽

X Ray Absorption

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Synthesis of Magnetic Ferrocene-Containing Polymer with Photothermal Effects for Rapid Degradation of Methylene Blue

Polymers ◽

10.3390/polym13040558 ◽

2021 ◽

Vol 13 (4) ◽

pp. 558

Author(s):

Wenhui Zhu ◽

Caiyun Zhang ◽

Yali Chen ◽

Qiliang Deng

Keyword(s):

Methylene Blue ◽

Photoelectron Spectroscopy ◽

Room Temperature ◽

Degradation Rate ◽

Model Compound ◽

Vibrating Sample Magnetometer ◽

Simulated Sunlight ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir

Photothermal materials are attracting more and more attention. In this research, we synthesized a ferrocene-containing polymer with magnetism and photothermal properties. The resulting polymer was characterized by Fourier-transform infrared (FT-IR), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Its photo-thermocatalytic activity was investigated by choosing methylene blue (MB) as a model compound. The degradation percent of MB under an irradiated 808 nm laser reaches 99.5% within 15 min, and the degradation rate is 0.5517 min−1, which is 145 times more than that of room temperature degradation. Under irradiation with simulated sunlight, the degradation rate is 0.0092 min−1, which is approximately 2.5 times more than that of room temperature degradation. The present study may open up a feasible route to degrade organic pollutants.

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IODINE LOCAL ENVIRONMENT IN HIGH PRESSURE BOROSILICATE GLASSES: AN X-RAY PHOTOELECTRON SPECTROSCOPY AND X-RAY ABSORPTION SPECTROSCOPY INVESTIGATION

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2021.153050 ◽

2021 ◽

pp. 153050

Author(s):

Yann MORIZET ◽

Valentin JOLIVET ◽

Nicolas TRCERA ◽

Tomo SUZUKI-MURESAN ◽

Jonathan HAMON

Keyword(s):

High Pressure ◽

Absorption Spectroscopy ◽

Photoelectron Spectroscopy ◽

Local Environment ◽

Borosilicate Glasses ◽

X Ray ◽

X Ray Absorption

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Ni-(In,Ga)As Alloy Formation Investigated by Hard-X-Ray Photoelectron Spectroscopy and X-Ray Absorption Spectroscopy

Physical Review Applied ◽

10.1103/physrevapplied.2.064010 ◽

2014 ◽

Vol 2 (6) ◽

Cited By ~ 9

Author(s):

Lee A. Walsh ◽

Greg Hughes ◽

Conan Weiland ◽

Joseph C. Woicik ◽

Rinus T. P. Lee ◽

...

Keyword(s):

Absorption Spectroscopy ◽

Photoelectron Spectroscopy ◽

Alloy Formation ◽

X Ray ◽

X Ray Absorption

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X-ray absorption spectroscopy and X-ray photoelectron spectroscopy of PtRe/Al2O3 catalysts: a comparison

Vacuum ◽

10.1016/0042-207x(83)90627-9 ◽

1983 ◽

Vol 33 (10-12) ◽

pp. 856-857 ◽

Cited By ~ 1

Author(s):

Julia H Onuferko ◽

David R Short ◽

Michael J Kelly

Keyword(s):

Absorption Spectroscopy ◽

Photoelectron Spectroscopy ◽

X Ray ◽

X Ray Absorption

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Chemical Structures of Native Oxides Formed During Wet Chemical Treatments on NH4F Treated Si(111) Surfaces

MRS Proceedings ◽

10.1557/proc-259-31 ◽

1992 ◽

Vol 259 ◽

Cited By ~ 3

Author(s):

Takeo Hattori ◽

Hiroki Ogawa

Keyword(s):

Photoelectron Spectroscopy ◽

Attenuated Total Reflection ◽

Native Oxide ◽

X Ray ◽

Chemical Treatments ◽

Chemical Structures ◽

Native Oxides ◽

Ft Ir ◽

Wet Chemical ◽

Silicon Interface

ABSTRACTChemical structures of native oxides formed during wet chemical treatments on NH4F treated Si(111) surfaces were investigated using X-ray Photoelectron Spectroscopy (XPS) and Fourier Transformed Infrared Attenuated Total Reflection(FT-IR-ATR). It was found that the amounts of Si-H bonds in native oxides and those at native oxide/silicon interface are negligibly small in the case of native oxides formed in H2SO4-H2O2-H2O solution. Based on this discovery, it was confirmed that native oxides can be characterized by the amount of Si-H bonds in native oxides. Furthermore, it was found that the combination of various wet chemical treatments with the treatment in NH4OH-H2O2-H2O solution results in the drastic decrease in the amount of Si-H bonds in native oxides.

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Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals

Materials ◽

10.3390/ma11091725 ◽

2018 ◽

Vol 11 (9) ◽

pp. 1725 ◽

Cited By ~ 5

Author(s):

Xiaohong Liu ◽

Ming Li ◽

Xuemei Zheng ◽

Elias Retulainen ◽

Shiyu Fu

Keyword(s):

Cellulose Nanocrystals ◽

Photoelectron Spectroscopy ◽

Surface Composition ◽

X Ray Diffraction ◽

Responsive Materials ◽

X Ray ◽

Ph Response ◽

Transmission Electron ◽

Ft Ir ◽

Hexyl Methacrylate

As a type of functional group, azo-derivatives are commonly used to synthesize responsive materials. Cellulose nanocrystals (CNCs), prepared by acid hydrolysis of cotton, were dewatered and reacted with 2-bromoisobuturyl bromide to form a macro-initiator, which grafted 6-[4-(4-methoxyphenyl-azo) phenoxy] hexyl methacrylate (MMAZO) via atom transfer radical polymerization. The successful grafting was supported by Fourier transform infrared spectroscopy (FT-IR) and Solid magnetic resonance carbon spectrum (MAS 13C-NMR). The morphology and surface composition of the poly{6-[4-(4-methoxyphenylazo) phenoxy] hexyl methacrylate} (PMMAZO)-grafted CNCs were confirmed with Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The grafting rate on the macro-initiator of CNCs was over 870%, and the polydispersities of branched polymers were narrow. The crystal structure of CNCs did not change after grafting, as determined by X-ray diffraction (XRD). The polymer PMMAZO improved the thermal stability of cellulose nanocrystals, as shown by thermogravimetry analysis (TGA). Then the PMMAZO-grafted CNCs were mixed with polyurethane and casted to form a composite film. The film showed a significant light and pH response, which may be suitable for visual acid-alkali measurement and reversible optical storage.

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