Autor: Zhang, Q. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Interaction between Polymer Brush and Nanoparticle: Brownian Dynamics Investigation
Autorzy:: Zhang, Q.
Xiang, X.
Powiązania:: https://bibliotekanauki.pl/articles/1400121.pdf
Data publikacji:: 2013-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.45.Xt
05.45.Jn
Opis:: We use Brownian dynamics simulations to study the adsorption behavior of a nanosized particle on polymer brushes. The adsorption process, the dynamic behavior of the nanoparticle in brush, the penetration depth, and the diffusion coefficient of the nanoparticle in different depths of the brush are all investigated for different grafting densities. We provide an area density Γp, which is the area average of the monomer number above the embedded nanoparticle in brush. We find that this area density explains well qualitatively the experimental phenomenon that the nanoparticles exhibit a maximum in the adsorbed amount as a function of the grafting density of brush.
Źródło:: Acta Physica Polonica A; 2013, 123, 4; 642-646
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Morphology Transformation of a Polymeric Micelle Induced by Two Encapsulated Particles
Autorzy:: Zhang, Q.
Xiang, X.
Powiązania:: https://bibliotekanauki.pl/articles/1377854.pdf
Data publikacji:: 2014-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 82.35.Np
82.35.Jk
Opis:: We begin with a pair of spherical particles encapsulated in a micelle and solve the problem within the self-consistent field theory to investigate the morphology transformation of the micelle induced by two nano-particles. The micelles are based on amphiphilic diblock copolymer AB in homopolymer A solvents. The nano-particles are simple models of proteins or colloids. We predict different micelle structures, and relate these morphologies to particle sizes, distances between two particles, and chemical potentials of the amphiphile molecules. There are found complex structures of the micelle induced by the twin particles: many reverse micelles only with even numbers or only one micelle attached at one of the two particles. These results are of immediate interests to the interactions of micelles and particles, as well as to the transitions between vesicles and micelles.
Źródło:: Acta Physica Polonica A; 2014, 126, 6; 1338-1342
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Experimental Evidence for Jahn-Teller Transition in a Fe(II)Fe(III) Bimetallic Oxalate
Autorzy:: Tang, G.
He, Y.
Xu, F.
Zhang, Q.
Powiązania:: https://bibliotekanauki.pl/articles/1400401.pdf
Data publikacji:: 2013-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Xx
76.80.+y
Opis:: Bimetallic oxalate ${[N-(n-C_4H_9)_4][FeFe(C_2O_4)_3]}_{n}$ has been investigated by the Mössbauer spectroscopy. The Mössbauer studies confirm that high-spin Fe(III) (S=5/2) and Fe(II) (S=2) ions are present in the compound. These spectra above 60 K consist of three quadrupole doublets, indicating that there are three different Fe sites in the material. The Mössbauer results reveal that spontaneous magnetization of Fe(II) sublattices increases more steeply than that of Fe(III) sublattices as the temperature decreases from $T_{C}$. Great increase of quadrupole splitting at 50 K provides compelling evidence for the predicted Jahn-Teller transition.
Źródło:: Acta Physica Polonica A; 2013, 123, 1; 118-120
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: A New Potential Superhard Phase of $OsN_2$
Autorzy:: Fan, Q.
Wei, Q.
Yan, H.
Zhang, M.
Zhang, D.
Zhang, J.
Powiązania:: https://bibliotekanauki.pl/articles/1205218.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.20.de
65.40.-b
62.20.dq
Opis:: A new phase of C2/m $OsN_2$ is proposed in this paper. The crystal structure, elasticity and electronic properties of C2/m $OsN_2$ were studied by first-principles calculations. The elastic constants, the elastic moduli (B, G, and E) and Poisson's ratio v of $OsN_2$ have been investigated. From the first-principles calculations, we find that C2/m $OsN_2$ is metallic and mechanically stable. The quasi-harmonic Debye model, using a set of total energy versus molar volume obtained from the first-principles calculations, is applied to the study of the thermal and vibrational effects. The dependence of structural parameters, thermal expansions, heat capacities, Grüneisen parameters and Debye temperatures on the temperature and pressure are obtained in the whole pressure range from 0 to 80 GPa and temperature range from 0 to 800 K as well as compared with available data.
Źródło:: Acta Physica Polonica A; 2014, 126, 3; 740-746
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies
Autorzy:: Zhang, P.
Zhang, Y.
Han, S.
Yan, Q.
Li, J.
Powiązania:: https://bibliotekanauki.pl/articles/2044762.pdf
Data publikacji:: 2006-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 36.20.Ng
87.64.Je
25.40.Fq
82.30.Rs
Opis:: The vibrational dynamics of water around glycine was investigated by using Raman spectroscopy and inelastic neutron scattering. Experiments of deuterated glycine versus deuterium were performed as comparison. The study shows that for glycine, the exchange of proton-deuteron on the active NH$\text{}_{3}^{+}$ side was easy, whereas there was hardly exchange on the CH$\text{}_{2}$ side. Comparing different proportion of glycine vs. water molecules we obtained that the presence of water hardly changes the main features of glycine illustrating its hydrophobic character. The intralayer hydrogen bonds of glycine crystal are difficult to be replaced due to its stronger bond than water.
Źródło:: Acta Physica Polonica A; 2006, 109, 3; 399-404
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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