Monthly Atmospheric Structure, Surface to 80 km

The Aurivillius phases of complex bismuth oxides have attracted considerable attention due to their lattice polarization (ferroelectricity) and photocatalytic activity. We report a first-principles exploration of Bi2WO6 and the replacement of W6+ by pentavalent (Nb5+, Ta5+) and tetravalent (Ti4+, Sn4+) ions, with charge neutrality maintained by the formation of a mixed-anion oxyhalide sublattice. We find that Bi2SnO4F2 is thermodynamically unstable, in contrast to Bi2TaO5F, Bi2NbO5F and Bi2TiO4F2. The electric dipoles introduced by chemical substitutions in the parent compound are found to suppress the spontaneous polarization from 61.55 μC/cm2 to below 15.50 μC/cm2. Analysis of the trends in electronic structure, surface structure, and ionization potentials are reported. This family of materials can be further extended with control of layer thicknesses and choice of compensating halide species.

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The Influence of Laser Irradiation and Ultrasound on the Structure, Surface Condition and Electrical Properties of TiS2/C Composites

Journal of Nano- and Electronic Physics ◽

10.21272/jnep.10(2).02016 ◽

2018 ◽

Vol 10 (2) ◽

pp. 02016-1-02016-5

Author(s):

I. M. Budzulyak ◽

◽

L. S. Yablon ◽

R. V. Ilnytskyi ◽

O. V. Morushko ◽

...

Keyword(s):

Electrical Properties ◽

Laser Irradiation ◽

Surface Condition ◽

Structure Surface

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Sensing atmospheric structure: Tropospheric tomographic results of the small-scale GPS campaign at the Onsala Space Observatory

Earth Planets and Space ◽

10.1186/bf03352309 ◽

2000 ◽

Vol 52 (11) ◽

pp. 941-945 ◽

Cited By ~ 5

Author(s):

A. Flores ◽

L. P. Gradinarsky ◽

P. Elósegui ◽

G. Elgered ◽

J. L. Davis ◽

...

Keyword(s):

Small Scale ◽

Space Observatory ◽

Atmospheric Structure ◽

Onsala Space Observatory

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Cold Plasma Deposition of Polymeric Nanoprotrusion, Nanoparticles, and Nanofilm Structures on a Slide Glass Surface

Processes ◽

10.3390/pr9010099 ◽

2021 ◽

Vol 9 (1) ◽

pp. 99

Author(s):

Sun-Woo Yi ◽

In-Keun Yu ◽

Woon-Jung Kim ◽

Seong-Ho Choi

Keyword(s):

Contact Angle ◽

Visible Light ◽

Methyl Methacrylate ◽

Cold Plasma ◽

Plasma Deposition ◽

Vinyl Monomers ◽

Glass Slides ◽

Structure Surface ◽

One Step ◽

Coated Surface

In this study, we coated the surface of glass slides with nanoprotrusion, nanoparticles, and nanofilm structures by one-step plasma deposition of three vinyl monomers. Three functional vinyl monomers with symmetrical polarity sites were used: methyl methacrylate (MMA), trifluoro methylmethacrylate (TFMA), and trimethylsilyl methyl methacrylate (TSMA). The TSMA/MMA (80/20, mol-%) nanoprotrusion-coated surface of slide glass was superhydrophobic, with a 153° contact angle. We also evaluated the transmittance (%) of the slide glass with nanoprotrusions in the infrared (IR) (940 nm), ultraviolet (365 nm) and visible light (380–700 nm) regions. The obtained nanoprotrusion structure surface of slide glass created by plasma deposition transmits more than 90% of visible light.

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Formulation of Quaternized Aminated Chitosan Nanoparticles for Efficient Encapsulation and Slow Release of Curcumin

Molecules ◽

10.3390/molecules26020449 ◽

2021 ◽

Vol 26 (2) ◽

pp. 449

Author(s):

Ahmed M. Omer ◽

Zyta M. Ziora ◽

Tamer M. Tamer ◽

Randa E. Khalifa ◽

Mohamed A. Hassan ◽

...

Keyword(s):

Slow Release ◽

Sodium Tripolyphosphate ◽

Chitosan Nanoparticles ◽

Gastric Fluid ◽

Release Profile ◽

Simulated Gastric Fluid ◽

Maximum Value ◽

Structure Surface ◽

Drug Encapsulation Efficiency

An effective drug nanocarrier was developed on the basis of a quaternized aminated chitosan (Q-AmCs) derivative for the efficient encapsulation and slow release of the curcumin (Cur)-drug. A simple ionic gelation method was conducted to formulate Q-AmCs nanoparticles (NPs), using different ratios of sodium tripolyphosphate (TPP) as an ionic crosslinker. Various characterization tools were employed to investigate the structure, surface morphology, and thermal properties of the formulated nanoparticles. The formulated Q-AmCs NPs displayed a smaller particle size of 162 ± 9.10 nm, and higher surface positive charges, with a maximum potential of +48.3 mV, compared to native aminated chitosan (AmCs) NPs (231 ± 7.14 nm, +32.8 mV). The Cur-drug encapsulation efficiency was greatly improved and reached a maximum value of 94.4 ± 0.91%, compared to 75.0 ± 1.13% for AmCs NPs. Moreover, the in vitro Cur-release profile was investigated under the conditions of simulated gastric fluid [SGF; pH 1.2] and simulated colon fluid [SCF; pH 7.4]. For Q-AmCs NPs, the Cur-release rate was meaningfully decreased, and recorded a cumulative release value of 54.0% at pH 7.4, compared to 73.0% for AmCs NPs. The formulated nanoparticles exhibited acceptable biocompatibility and biodegradability. These findings emphasize that Q-AmCs NPs have an outstanding potential for the delivery and slow release of anticancer drugs.

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Hollow Carbon Fiber Decorated by Nano Structure Surface for High‐Efficiency Water Steam Generation

Advanced Sustainable Systems ◽

10.1002/adsu.202100122 ◽

2021 ◽

pp. 2100122

Author(s):

Xidong Suo ◽

Jie Yang ◽

Yanrong Zhang ◽

Yuting Hao ◽

Jiahui Yang ◽

...

Keyword(s):

Carbon Fiber ◽

High Efficiency ◽

Steam Generation ◽

Nano Structure ◽

Water Steam ◽

Structure Surface ◽

Hollow Carbon

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Optimization and characterization of flavonoids extracted from Cannabis sativa fibers

Textile Research Journal ◽

10.1177/00405175211027796 ◽

2021 ◽

pp. 004051752110277

Author(s):

Qilu Cui ◽

Jiawei Li ◽

Chongwen Yu

Keyword(s):

Chemical Structure ◽

Cannabis Sativa ◽

Ethanol Concentration ◽

Extraction Process ◽

Test Results ◽

Hemp Fiber ◽

Hemp Fibers ◽

Structure Surface ◽

Degumming Process

In this paper, the extraction process of flavonoids from hemp fibers was studied. Response surface methodology (RSM) analysis of the extraction parameters indicated that optimized results would be ethanol concentration 76 vol.%, bath ratio 1:50, and reaction time 139 min; therefore, an optimal extraction rate of flavonoids of 0.2275% can be obtained. The chemical structure, surface morphology and element composition of flavonoid extracts were analyzed. The test results indicated that hemp extract contains flavonoids, which can be used to extract flavonoids from hemp fiber, so as to comprehensively develop hemp fiber and reduce the discharge of waste liquid in the traditional degumming process.

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