UV-Vis and XRD investigation of graphite-doped poly(acrylic) acid membranes

Todicǎ, M.; Stefan, Traian; Simon, S.; Balasz, I.; Daraban, Liviu

doi:10.3906/fiz-1305-16

Cited by 40 publications

(23 citation statements)

References 20 publications

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“…The peak at 1232 cm -1 is assigned to C -C -O -C -C stretching. The peak at 1041 cm -1 corresponds to phenyl in plane C -H bending vibration, [5,9,10,13]. Low amplitude of the bands in the 1250 cm -1 range are in accord with other works reported in literature, [14].…”

supporting

confidence: 78%

“…We found the value d=5.0 Å. The area S under the diffraction peak is proportional with the concentration of the ordered domains in the sample and the width of the signal is correlated with the size of the ordered domains, [5]. Using Scherrer's formula we found the value D=14.1 Å of the size of ordered domains.…”

Section: Introductionmentioning

confidence: 75%

“…The thermal treatment facilitates the local ordered arrangement of polymeric chains and the increase of ratio of the crystalline phase, [6][7][8]. It can be observed a weak shift towards higher diffraction angles of the main peak at 18.7 0 , (Fig.…”

mentioning

confidence: 99%

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XRD and IR Investigations of Some Commercial Polystyrene Samples Thermally Degraded

Niculăescu¹,

Olar²,

Ştefan³

et al. 2018

Studia UBB Chemia

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Thermal degradation of commercial polystyrene was investigated by XRD and FT-IR metods. The samples were heated 30 minutes at temperatures 140ºC, 200ºC, 250ºC, 300ºC and 350ºC and then brought back to room temperature. XRD investigation denotes structural modification for samples heated above 200ºC. This modification is confirmed by FT-IR measurments. Some vibration bands are affected by thermal degradation at temperatures higher than 200ºC. Both FT-IR and XRD methods reveal modification of microscopic structure of the polystyrene submitted to thermal degradation.

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confidence: 78%

Section: Introductionmentioning

confidence: 75%

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XRD and IR Investigations of Some Commercial Polystyrene Samples Thermally Degraded

Niculăescu¹,

Olar²,

Ştefan³

et al. 2018

Studia UBB Chemia

Self Cite

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“…1 f) illustrates the peaks at 2θ = 10° (d001 = 0.83 nm), 2θ = 20° (d002 = 0 0.48 nm), 2θ = 26° (d002 = 0 34 nm) and 2θ = 55° (d004 = 0 0.17 nm). The peaks at 2θ = 26°, 55° is characteristic of graphite and after chemical oxidation of it, the inter planar distance increase and the other peaks appear 39 , 42 .…”

Section: Methodsmentioning

confidence: 99%

2D materials coated on etched optical fibers as humidity sensor

Owji

Mokhtari

Ostovari

et al. 2021

Sci Rep

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In this investigation, etched-fibers are coated by 2D layers such as Molybdenum disulfide (MoS2), Molybdenum diselenide (MoSe2) and composition of graphene and graphene oxide (G/GO) to modify humidity sensing. The relative differentiation of attenuations (RDA) in presence of relative humidity (RH) is measured by Optical Loss Test Set at two standard-wavelengths-telecommunication (1310 nm and 1550 nm). Results show that the etched single-mode fiber (ESMF) coated with G/GO has relatively high and one by one function for RDA versus RH (more than 30%). Also, its sensitivity and variance are reasonable. The MoSe2 based sensor is applicable at humidity below 30% because of higher RDA. However, it is not useful at humidity more than 30% due to the absence of one by one function for RDA versus RH. Besides, ESMF coated with MoS2 has indistinctive behavior and is not useful as a humidity sensor.

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“…The preparation of inclusion complex was evaluated by comparing the XRD patterns of the γ-Fe 2 O 3 @Au/PβCD/PAA-SDN with PAA-SDN, γ-Fe 2 O 3 @Au/PβCD, and their physical mixture. The XRD pattern of PAA-SDN shows amorphous peaks at around 2θ=10–20° and 2θ=25–35° 53. γ-Fe 2 O 3 @Au/PβCD/PAA-SDN has similar XRD pattern with the pattern of γ-Fe2O3@Au/PβCD except that in the spectrum of γ-Fe 2 O 3 @Au/PβCD/PAA-SDN the Fe index in 2θ=32° (200) is disappeared.…”

Section: Resultsmentioning

confidence: 86%

<p>Fabricating β-cyclodextrin based pH-responsive nanotheranostics as a programmable polymeric nanocapsule for simultaneous diagnosis and therapy</p>

Zarepour

Zarrabi

Larsen

2019

IJN

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Background Fabrication of a smart drug delivery system that could dramatically increase the efficiency of chemotherapeutic drugs and reduce the side effects is still a challenge for pharmaceutical researchers. By the emergence of nanotechnology, a huge window was opened towards this goal, and a wide type of nanocarriers were introduced for delivering the chemotherapeutic to the cancer cells, among them are cyclodextrins with the ability to host different types of hydrophobic bioactive molecules through inclusion complexation process. Aim The aim of this study is to design and fabricate a pH-responsive theranostic nanocapsule based on cyclodextrin supramolecular nano-structure. Materials and methods This nanostructure contains iron oxide nanoparticles in the core surrounded with three polymeric layers including polymeric β-cyclodextrin, polyacrylic acid conjugated to sulfadiazine, and polyethylenimine functionalized with β-cyclodextrin. Sulfadiazine is a pH-responsive hydrophobic component capable of making inclusion complex with β-cyclodextrin available in the first and third layers. Doxorubicin, as an anti-cancer drug model, was chosen and the drug loading and release pattern were determined at normal and acidic pH. Moreover, the biocompatibility of the nanocapsule (with/without drug component) was examined using different techniques such as MTT assay, complement activation, coagulation assay, and hemolysis. Results The results revealed the successful preparation of a spherical nanocapsule with mean size 43±1.5 nm and negatively charge of −43 mV that show 160% loading efficacy. Moreover, the nanocapsule has an on/off switching release pattern in response to pH that leads to drug released in low acidic pH. The results of the biocompatibility tests indicated that this nano drug delivery system had no effect on blood and immune components while it could affect cancer cells even at very low concentrations (0.3 μg mL −1 ). Conclusion The obtained results suggest that this is a “switchable” theranostic nanocapsule with potential application as an ideal delivery system for simultaneous cancer diagnosis and therapy.

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UV-Vis and XRD investigation of graphite-doped poly(acrylic) acid membranes

Cited by 40 publications

References 20 publications

XRD and IR Investigations of Some Commercial Polystyrene Samples Thermally Degraded

XRD and IR Investigations of Some Commercial Polystyrene Samples Thermally Degraded

2D materials coated on etched optical fibers as humidity sensor

<p>Fabricating β-cyclodextrin based pH-responsive nanotheranostics as a programmable polymeric nanocapsule for simultaneous diagnosis and therapy</p>

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