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Artículos de revistas sobre el tema "Pt/Co system"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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1

Maji, Saikat, Ankan Mukhopadhyay, Soubhik Kayal y P. S. Anil Kumar. "Domain wall chirality reversal by interfacial engineering in Pt/Co/Pt based perpendicularly magnetized systems". Journal of Applied Physics 133, n.º 2 (14 de enero de 2023): 023907. http://dx.doi.org/10.1063/5.0117198.

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Heavy metal/ferromagnet interfaces in systems with perpendicular magnetic anisotropy (PMA) hosts chiral Néel wall with the assistance of interfacial Dzyaloshinskii–Moriya interaction (iDMI). We have investigated field induced domain wall motion in the creep regime to estimate the effective iDMI strength, [Formula: see text] of sputter-deposited Ta/Pt/Co/Pt and Ta/Pt/Co/Au/Pt thin films that exhibit PMA. Two similar Pt/Co interfaces on either side of the Co layer in the Ta/Pt/Co/Pt system lead to a small [Formula: see text] with a negative sign that supports the Néel type domain wall of right-handed chirality. Ultrathin Au layers of different thicknesses have been deposited at the top Co/Pt interface to introduce asymmetry around the Co layer and control the [Formula: see text]. Here, two interfaces (Pt/Co and Au/Co) of opposite iDMI polarity have been chosen to invert the domain wall chirality to the left-handed chirality instead of the right-handed chirality found in the Ta/Pt/Co/Pt system.

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2

Le Bouar, Y., A. Loiseau, A. Finel y F. Ducastelle. "Wetting behavior in the Co-Pt system". Physical Review B 61, n.º 5 (1 de febrero de 2000): 3317–26. http://dx.doi.org/10.1103/physrevb.61.3317.

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3

Koyama, T., A. Obinata, Y. Hibino, A. Hirohata, B. Kuerbanjiang, V. K. Lazarov y D. Chiba. "Dependence of Curie temperature on Pt layer thickness in Co/Pt system". Applied Physics Letters 106, n.º 13 (30 de marzo de 2015): 132409. http://dx.doi.org/10.1063/1.4916824.

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4

Watanabe, Kiyoshi, Takejiro Kaneko y Shigehiro Ohnuma. "Temperature Dependence of Magnetic Properties in Co-Pt, Fe-Pt and Cr-Pt Permanent Magnet Alloy System". Journal of the Japan Institute of Metals 56, n.º 12 (1992): 1495–500. http://dx.doi.org/10.2320/jinstmet1952.56.12_1495.

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5

Kavita, S., V. Raghavendra Reddy, S. Amirthapandian, Ajay Gupta y B. K. Panigrahi. "Si+ion irradiation in a Co/Pt multilayer system". Journal of Physics: Condensed Matter 21, n.º 9 (9 de febrero de 2009): 096003. http://dx.doi.org/10.1088/0953-8984/21/9/096003.

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6

Grushko, B. "A study of the Al–Co–Pt alloy system". Journal of Alloys and Metallurgical Systems 5 (marzo de 2024): 100058. http://dx.doi.org/10.1016/j.jalmes.2024.100058.

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7

Zakharov, Nikita, Irina Tikhonova, Anna Popova, Valery Pugachev, Vadim Dodonov, Igor Prosvirin, Viktor Krasheninin y Yuri Zakharov. "Synthesis and study of some physicochemical features of Co-Pt nanostructured system". BIO Web of Conferences 93 (2024): 04012. http://dx.doi.org/10.1051/bioconf/20249304012.

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In the work by methods of XRD, TEM, SAED, XPS combined with mass-spectrometry of gaseous products, SAXS, and elemental analysis of samples the phase compositions and morphology of particles of nanostructured Co-Pt system synthesized by the method of reduction of hydrazine-hydrate aqueous solutions of precursors were studied (in the region rich in Pt for the first time). It was found that in the composition range up to ≈ 60 at. % Co. XRD-analysis of synthesized samples fixes as the only FCC phase of solid solution of Co in Pt, with the established upper limit of solubility %18±1 at. At the content of Co above the limit, along with it, the X-ray diffraction unregistered phases with the content of Co above the limit in solid solution are also formed. Their presence was confirmed by the SAXS method, and their metallic nature (not oxide-hydroxide) nature follows from the results of XRD, SAED. When FCC phase formed metal reduction process proceeded directly without cobalt hydroxides forming. According to results of XPS with the Ar-etching of samples there were internal platinum-rich sub-regions in Co-Pt nanoalloys.

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8

Kocaman, Bayram. "Tailoring magnetic properties by tuning the interface in a Pt/Co/Pt/IrMn system with perpendicular and double-exchange biases". Journal of Physics D: Applied Physics 55, n.º 24 (22 de marzo de 2022): 245003. http://dx.doi.org/10.1088/1361-6463/ac5b45.

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Abstract We prepared Pt/Co/Pt(t Pt)/IrMn heterostructures with perpendicular exchange bias (PEB) by inserting a Pt spacer between Co and IrMn. X-ray diffraction demonstrates that the IrMn and Pt layers exhibit a (111) texture promoting PEB. Here, the samples for various Pt spacer thicknesses exhibit double-shifted hysteresis loops with the coexistence of positive and negative exchange biases (EBs). Magnetic force microscopy measurement indicates that this behavior in the as-grown state results from the formation of an antiferromagnetic bidomain state with opposite signs. Also, the magnetic loop behaviors can be tailored by tuning the EB, coercive and switching fields which are sensitive to sub-nanometer changes in the spacer layer (Pt) thickness. It is found that the optimum thickness of the Pt layer is 0.8 nm by considering a well-defined single remanence state, where H EB is about seven times as large as the coercivity. Our results indicate that large EB and rather small coercivity necessary for the single-remanence state in the double-shifted Pt/Co/Pt/IrMn systems can be achieved by tuning the interface at atomic level. Moreover, magnetic properties were analyzed in detail depending on Pt space spacer layer thickness between Co and IrMn layers. These results may be useful for potential applications in future multilevel memory devices.

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9

Herlina, H., Muhammad Ali Zulfikar y B. Buchari. "Cyclic voltammetry in electrochemical oxidation of amoxicillin with Co(III) as mediator in acidic medium using Pt, Pt/Co and Pt/Co(OH)2 electrodes". MATEC Web of Conferences 197 (2018): 05004. http://dx.doi.org/10.1051/matecconf/201819705004.

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Amoxicillin is one of penicillin antibiotic groups with active β-lactam which the presence in surface water and wastes not only affects water quality but also causes long-term adverse effects on ecosystems and human health due to their resistance to natural biodegradation. The processing of organic waste electrochemically has the advantages of cheap and efficient cost, waste gas that does not contain toxic and hazardous materials. Have been studied the process of amoxicillin electro-oxidation mediated by a cobalt (III) in a cyclic voltammetry study using a platinum, Pt/Co(OH)2 and Pt/Co as working electrodes in acidic medium HNO3 and H2SO4 as supporting electrolytes solution. The voltammogram of Pt, Pt/Co and Pt/Co(OH)2 electrodes showed that higher current was found in medium of HNO3 0.1 M and it can be used to oxidize the amoxicillin wastes, the two anodic and cathodic peaks can be observed at potential of 200-800 mV (vs Ag/AgCl). The presence of cobalt (III) ions in the system caused the decrease of oxidation current, indicated the presence of degradation to amoxicillin.

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10

Shiratsuchi, Yu, Yuichiro Takechi, Kentaro Toyoki, Yuuta Nakano, Satoshi Onoue, Chiharu Mitsumata y Ryoichi Nakatani. "High-Temperature Regeneration of Perpendicular Exchange Bias in a Pt/Co/Pt/α-Cr2O3/Pt Thin Film System". Applied Physics Express 6, n.º 12 (1 de diciembre de 2013): 123004. http://dx.doi.org/10.7567/apex.6.123004.

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11

Моргунов, Р. Б., Г. Л. Львова, A. Hamadeh y S. Mangin. "Конкуренция доменных стенок и фазы обратной намагниченности в магнитной релаксации спинового переключателя Pt/Co/Ir/Co/Pt". Физика твердого тела 60, n.º 1 (2018): 76. http://dx.doi.org/10.21883/ftt.2018.01.45291.143.

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AbstractA multilayer Pt/Co/Ir/Co/Pt/GaAs heterostructures demonstrates a long term (to several hours) magnetic relaxation between two stable states of the magnetization of the system. The magnetization reversal of the heterostructure layers occurs both due to the formation of nuclei of the reverse magnetization domains and as a result of their further growth by means of motion of domain walls. The competition between two these processes provides a nonexponential character of the magnetic relaxation. At 300 K, the contributions of these processes to the relaxation are commensurable, while, at temperatures lower than 200 K, the contribution of the nucleation is suppressed and the magnetic relaxation occurs as a result of motion of the domain walls.

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12

Hu, K., X. M. Huang, J. Lu, H. S. Liu, G. M. Cai y Z. P. Jin. "Measurement of phase equilibria in Ti-Co-Pt ternary system". Calphad 60 (marzo de 2018): 191–99. http://dx.doi.org/10.1016/j.calphad.2017.12.007.

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13

Lopes, Pietro P. y Edson A. Ticianelli. "The CO tolerance pathways on the Pt–Ru electrocatalytic system". Journal of Electroanalytical Chemistry 644, n.º 2 (junio de 2010): 110–16. http://dx.doi.org/10.1016/j.jelechem.2009.06.011.

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14

CABEZA, G. F., N. J. CASTELLANI y P. LÉGARÉ. "THEORETICAL STUDY OF CO ADSORPTION ON Ni(111), Pt(111) AND Pt/Ni(111) SURFACES". Surface Review and Letters 06, n.º 03n04 (junio de 1999): 369–81. http://dx.doi.org/10.1142/s0218625x99000378.

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CO adsorption on a pseudomorphic Pt overlayer supported by Ni (111) has been studied with the use of extended Huckel calculations. Experimental information on the pure Pt (111) and Ni (111) single crystals was employed to select a consistent parameter set for our bimetallic system. This gives a good description of the chemisorption bond changes between the various systems considered in our study. The CO chemisorption energy on Pt/Ni (111) was found to be lowered in comparison with Pt (111) and Ni (111), in good agreement with experimental data on Pt-rich Pt–Ni surface alloys. This observation could be justified by the electronic changes of the Pt states (valence band broadening and decreasing density at the Fermi level). Indeed, they induce, in comparison with the pure substrates, a repulsion between Pt and CO although the 2π* population of the chemisorbed molecule increases. This points to the necessity of going beyond arguments based on an analysis of the 5σ donation and 2π* backdonation for a complete description of the chemisorption bond.

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15

Putri, Anisa Diana y Jauhari Arifin. "PERANCANGAN INSTRUKSI KERJA DIGITAL CO-MANUFACTURING OPERATIONS SYSTEM (STUDI KASUS PT.XYZ)". semanTIK 8, n.º 2 (31 de diciembre de 2022): 113. http://dx.doi.org/10.55679/semantik.v8i2.28487.

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PT. XYZ merupakan perusahaan yang menghasilkan produk nutrisi berkualitas di setiap tahap kehidupan manusia tetapi pada proses pengerjaan aplikasi DCOMS (Digital Co-Manufacturing Operations System) ini perlu adanya instruksi kerja untuk mempermudah suatu alur atau urutan dari langkah yang harus dilaksanakan untuk menyelesaikan sebuah pekerjaan. Tujuan penelitian ini yaitu untuk mengetahui cara mengunakaan aplikasi DCOMS (Digital Co-Manufacturing Operations System). Teknik pengumpulan data yang digunakan terdiri dari tiga langkah: metode wawancara, observasi, dan dokumentasi selama bulan Maret 2022. Hasil analisis (1) menunjukan bahwa aplikasi DCOMS (Digital Co-Manufacturing Operations System) ini memudahkan PT. XYZ untuk melihat pelaporan data yang berkaitan dengan perencanaan produksi, proses produksi, kualitas produksi, raw material, packaging material dan hasil produksi antar bagian dalam perusahaan, serta hubungan dengan distributor dan para outsourcing. (2) pembuatan pada instruksi kerja dan interaksi manusia-komputer pada aplikasi DCOMS (Digital Co-Manufacturing Operations System) juga dapat meningkatkan stok akurasi untuk kedepannya atau jangka waktu panjang dan mempermudah outsourcing dalam menginput data list batch order. (3) Pengembangan sistem informasi ini dapat memudahkan PT. XYZ untuk melihat status data list order dari berbagai rekanan pabrik.Kata kunci; Instruksi Kerja, DCOMS, Interaksi Manusia-Komputer, outsourcing, Sistem Informasi

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16

Lin, Fan, Carlos E. García-Vargas y Yong Wang. "A Bifunctional Pt/CeO2-Cu1/CeO2 Catalyst System for Isooctane Oxidation under Fully Simulated Engine-Exhaust Condition: Eliminating the Inhibition by CO". Catalysts 13, n.º 3 (1 de marzo de 2023): 508. http://dx.doi.org/10.3390/catal13030508.

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Pt-based catalysts, because of their outstanding activity for hydrocarbon oxidation, are widely used in the engine-exhaust aftertreatment system to remove hydrocarbon emissions. However, the CO and NOx present in real engine exhausts compete with hydrocarbons for active Pt sites, and thus inhibit hydrocarbon oxidation. In this work, we evaluated the inhibition effects of CO and NO on isooctane oxidation over a Pt/CeO2 catalyst under the simulated condition of the US DRIVE test protocol (S-GDI, stoichiometric gasoline direct injection). We also leveraged a low-cost single-atom Cu1/CeO2 catalyst, which is highly active for low-temperature CO oxidation, to eliminate the inhibition effect of CO. Specifically, by physically mixing Cu1/CeO2 and Pt/CeO2, all the CO is completely converted below 200 °C under simulated exhaust condition, which helps lower the isooctane oxidation temperature. However, the unconverted NO still strongly suppresses HC oxidation. Possible strategies to address the NO inhibitor were proposed.

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17

Wu, Yijun, Yige Zhao, Jingjun Liu y Feng Wang. "Adding refractory 5d transition metal W into PtCo system: an advanced ternary alloy for efficient oxygen reduction reaction". Journal of Materials Chemistry A 6, n.º 23 (2018): 10700–10709. http://dx.doi.org/10.1039/c8ta00029h.

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18

Stamenkovic, Vojislav, Berislav Blizanac, Branimir Grgur y Nenad Markovic. "Electrocatalysis of fuel cells reaction on Pt and Pt-bimetallic anode catalysts: A selective review". Chemical Industry 56, n.º 6 (2002): 273–86. http://dx.doi.org/10.2298/hemind0206273s.

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In this review we selectively summarize recent progress, primarily from our laboratory, in the development of interrelationships between the kinetics of the fuel cells reactions and the structure/composition of anode catalysts. The focus is placed on two types of metallic surfaces: platinum single crystals and bimetallic surfaces based on Pt. In the first part it was illustrated that the hydcogen reaction is structure sensitive process, with Pt(110) being an order of magnitude more active than either of the atomically "flatter" (100) and (111) surfaces. The hydrogen reaction on Pt(hkl) modified by pseudomorphic Pd (sub)monolayers shows the "volcano-like" behavior, having the maximum rate on Pt(111) modified by 1 ML of Pd. The Pt(111)-Pd system is used to demonstrate how the energetics of intermediates formed in the hydrogen reaction is affected by interfacial bonding and energetic constraints produced between pseudomorphic Pd films and the Pt(111) substrate. In the second part it was shown that the oxidation of Ha in the presence of CO occurs concurrently with CO oxidation on Pt and Pt bimetallic surfaces. The Pt-Ru system is used to demonstrate that both the bifunctional effect and the ligand effect contribute to the influence of Ru on the CO oxidation rate and for Hz oxidation process in the presence of CO. The knowledge is then used to create the real-life catalyst with the catalytic activities which are, to the greatest extend possible similar to the tailor-made surface.

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19

Mangal, Harsha, Amit Saxena, Nivedita Shukla, P. K. Rai, A. S. Rawat, Vivek Kumar, Vatsana Gupta y Monika Datta. "Zero valent metal loaded silica nanoparticles for the removal of TNT from water". Water Science and Technology 75, n.º 3 (2 de diciembre de 2016): 716–26. http://dx.doi.org/10.2166/wst.2016.478.

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Silica nanoparticles with a surface area of 673.60 m2/g and particle size of 8–12 nm were prepared using aerogel process (AP) followed by super critical drying. Zero valent Fe, Co, Pt, and bimetallic Fe/Pt and Fe/Co were loaded using an incipient wetness impregnation technique and subsequent reduction. Scanning electron microscopy-energy dispersive X-ray (SEM-EDX) and transmission electron microscopy-energy dispersive X-ray (TEM-EDX) characterizations indicated fine dispersion of iron on AP-SiO2 +Fe system. Prepared nanoparticles were evaluated for the adsorptive removal of 2,4,6-trinitrotoluene (TNT) from water. Surface area normalized rate constant values indicated the adsorptive removal potential of prepared nanoparticles to be: AP-SiO2 + Fe/Co > AP-SiO2 + Fe > CM (commercial) SiO2 + Fe > AP-SiO2 + Co > AP-SiO2 + Fe/Pt > AP-SiO2 + Pt. Lower pH helped in accelerating the reactive removal of TNT on zero valent iron loaded silica. AP-SiO2 + Fe/Co system showed the maximum adsorption potential (74 mg/g) after five cycles.

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20

Qiu, N. "Evolution of intrinsic coercivity in Pt-Co-B alloys". Proceedings, annual meeting, Electron Microscopy Society of America 50, n.º 1 (agosto de 1992): 202–3. http://dx.doi.org/10.1017/s0424820100121417.

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New permanent magnets based on Pt-Co-B ternary alloys have been developed by rapidly solidification with subsequent heat treatments. The coercivity achieved in the Pt-Co-B ternary alloys is more than double the highest coercivity observed in the Pt-Co binary system. Good thermal stability of the coercivity produced by annealing provides a basis for consolidation processes such as hot isotropic pressing to produce bulk magnets from the rapidly solidified Pt-Co-B materials. Increased coercivity coupled with special properties such as high Curie temperature, corrosion resistance and ductility may expand the potential applications for these alloys. The evolution of microstructure and its effect on coercivity from annealing the as-quenched materials are investigated to understand the magnetic hardening mechanism and optimize the magnetic properties.

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21

Gornakov, V. S., I. V. Shashkov, O. A. Tikhomirov y Yu P. Kabanov. "Spacer Thickness and Temperature Dependences of the Interlayer Exchange Coupling in a Co/Pt/Co Three-Layer Structure". Magnetochemistry 9, n.º 7 (8 de julio de 2023): 176. http://dx.doi.org/10.3390/magnetochemistry9070176.

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Domain wall mobility as a function of nonmagnetic interlayer thickness and temperature was studied in ultrathin exchange-coupled ferromagnetic layers using magneto-optic Kerr microscopy. The system under study is a Pt/Co/Pt/Co/Pt heterostructure having perpendicular magnetic anisotropy and a middle Pt layer with spatially variable thickness. The ferromagnetic interaction between the Co layers is observed when the Pt interlayer thickness varies from 5 to 6 nm in a temperature range of 200–300 K. There is a certain interval of Pt layer thickness where domain walls in both ferromagnetic layers move independently. Nonlinear dependence of the domain wall displacement on the applied field was measured. It is shown that an equilibrium position of the relaxed domain wall depends on field, temperature, and the nonmagnetic interlayer thickness. This position is determined by the energy balance: (i) domain wall displacement provided by the applied field, (ii) interlayer exchange interaction in the area swept by the domain wall, and (iii) domain wall coercivity. The mechanism of domain wall stabilization in terms of independent wall motion near critical thickness was considered. It is found that both the coercivity of the Co layer and the critical thickness decrease at higher temperature, while the interlayer exchange constant J is changed weakly.

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22

Ashida, T., M. Oida, N. Shimomura, T. Nozaki, T. Shibata y M. Sahashi. "Observation of magnetoelectric effect in Cr2O3/Pt/Co thin film system". Applied Physics Letters 104, n.º 15 (14 de abril de 2014): 152409. http://dx.doi.org/10.1063/1.4871515.

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23

Wang, J. X., I. K. Robinson, B. M. Ocko y R. R. Adzic. "Adsorbate-Geometry Specific Subsurface Relaxation in the CO/Pt(111) System". Journal of Physical Chemistry B 109, n.º 1 (enero de 2005): 24–26. http://dx.doi.org/10.1021/jp045082i.

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24

Fink, Th, K. Krischer y R. Imbihl. "Kinetic oscillations in the Pt(100)/NO+CO system: Bifurcation analysis". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 10, n.º 4 (julio de 1992): 2440–44. http://dx.doi.org/10.1116/1.577981.

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25

Gu, Z. F., CH F. Xu, Z. F. Huang, G. Cheng y M. H. Jiang. "A 500 \circC isothermal section for the Pr–Pt–Co system". Calphad 34, n.º 1 (marzo de 2010): 84–89. http://dx.doi.org/10.1016/j.calphad.2009.12.005.

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26

Tüshaus, M., E. Schweizer, P. Hollins y A. M. Bradshaw. "Yet another vibrat1onal study of the adsorption system Pt{111}-CO". Journal of Electron Spectroscopy and Related Phenomena 44, n.º 1 (enero de 1987): 305–16. http://dx.doi.org/10.1016/0368-2048(87)87031-7.

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27

GALEOTTI, MONICA, ANDREA ATREI, UGO BARDI, BRUNETTO CORTIGIANI, GIANFRANCO ROVIDA y MARCO TORRINI. "STRUCTURAL STUDY OF ALLOY FORMATION AT THE Co-Pt(111) INTERFACE". Surface Review and Letters 03, n.º 05n06 (octubre de 1996): 1691–700. http://dx.doi.org/10.1142/s0218625x96002631.

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This study examines the structure of the surface alloys that form at the surface of the system formed by depositing cobalt on the clean Pt(111) surface. Using mainly XPD as a structure-sensitive technique, surface alloys were observed to form in this system after annealing at temperatures of about 600 K or higher. When starting with a single atomic layer of cobalt, diffusion leads to a surface phase where Pt atoms occupy mainly the topmost layer while cobalt atoms are mainly located in the second layer from the surface. Multi-atomic-layer alloying, with the formation of an epitaxial, random substitutional Co-Pt(111) alloy, is observed at higher temperatures.

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28

Lu, Yi, Ting Xiao, Rongrong Lai, Ziyi Liu, Weixuan Luo, Yixuan Wang, Shijia Fu, Guihong Chai, Jinjing Jia y Yuehong Xu. "Co-Delivery of Loxoprofen and Tofacitinib by Photothermal Microneedles for Rheumatoid Arthritis Treatment". Pharmaceutics 15, n.º 5 (15 de mayo de 2023): 1500. http://dx.doi.org/10.3390/pharmaceutics15051500.

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Rheumatoid arthritis (RA) is an autoimmune disease of synovial inflammation that affects populations worldwide. Transdermal drug delivery systems for treating RA have increased but remain challenging. We fabricated a dissolving microneedle (MN) system with photothermal (PT) polydopamine (PDA) to co-load the non-steroidal anti-inflammatory drug loxoprofen (Lox) and the Janus kinase inhibitor tofacitinib (Tof), with the aim of co-delivering Lox and Tof directly to the articular cavity, aided by the combination of MN and PT. In vitro and in vivo permeation studies showed that the PT MN significantly promoted drug permeation and retention in the skin. An in vivo visualization of the drug distribution in the articular cavity showed that the PT MN significantly promoted drug retention in the articular cavity. Importantly, compared to the intra-articular injection of Lox and Tof, the application of the PT MN to a carrageenan/kaolin-induced arthritis rat model exhibited superior performance in reducing joint swelling, muscle atrophy, and cartilage destruction. Furthermore, the PT MN downregulated the mRNA expression levels of proinflammatory cytokines, including TNF-α, IL-1β, iNOS, JAK2, JAK3, and STAT3. The results show that the PT MN transdermal co-delivery of Lox and Tof is a new synergetic therapy with high compliance and good therapeutic efficacy for RA.

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29

Jia, Zhou-Yan, Hao Zhou, Li-Shuang Hou, Fang Kou, Tang-Rui Zhang, Bao-Long Wang, Wei Wang, Si-Yuan Zhou y Bang-Le Zhang. "Construction of tumor microenvironment and redox responsive nanocarrier-mediated cisplatin co-delivery system for effective chemotherapy to pancreatic cancer". Nano Futures 6, n.º 2 (12 de abril de 2022): 025002. http://dx.doi.org/10.1088/2399-1984/ac61f7.

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Abstract Pancreatic cancer is a malignant tumor with a high mortality rate. The rich stroma in tumor tissue is a major barrier to drug penetration and tumor killing. Cisplatin and cisplatin-based nano-delivery systems are widely used as chemotherapeutic agents. However, the side effects and the inability of permeating tumor tissue in depth have limited their application in the clinic. Hyaluronan is an important component of the extracellular matrix in the tumor tissue and has the potential to be targeted for tumor stroma degradation. Therefore, a nanocarrier-mediated cisplatin co-delivery system BPEI-SS-Pt/HAase@CaP consisting of hyaluronidase (HAase) and polymer-cisplatin conjugate BPEI-SS-Pt through disulfide bonding to branched polyethyleneimine (BPEI) was constructed. In the construction of the co-delivery system of BPEI-SS-Pt and HAase, amorphous calcium phosphate is introduced to obtain the tumor microenvironment responsive release of HAase. The particle size of optimized BPEI-SS-Pt/HAase@CaP nano-complexes is 143 ± 14 nm. In the tumor microenvironment, BPEI-SS-Pt/HAase@CaP nano-complexes were able to release HAase to degrade the hyaluronan in the tumor stroma. The results of histochemical and fluorescent labeling showed that hyaluronan was degraded in vivo by BPEI-SS-Pt/HAase@CaP and the nanocarrier-mediated BPEI-SS-Pt can be easily across the loosened stroma and penetrated the tumor tissue more deeply compared with BPEI-SS-Pt without loading HAase. When they were uptaken into tumor cells and responded to high glutathione in the intracellular environment to release cisplatin, more effective chemotherapy to pancreatic cancer was obtained. Compared with the free cisplatin or BPEI-SS-Pt group, BPEI-SS-Pt/HAase@CaP nano-complexes achieved the best antitumor effect in vivo, promising the future clinic use of cisplatin for effective chemotherapy to pancreatic cancer.

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30

Karipidis, Paraskevas, Athanassios C. Tsipis y Constantinos A. Tsipis. "Density Functional Study of the Electronic Structure and Related Properties of Pt(NO)/Pt(NO2) Redox Couples". Collection of Czechoslovak Chemical Communications 68, n.º 3 (2003): 423–46. http://dx.doi.org/10.1135/cccc20030423.

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Density functional calculations at the B3LYP level of theory, using the SDD basis set, provide satisfactory description of geometric, energetic, electronic and spectroscopic properties of the Pt(NO)/Pt(NO2) redox couple. The neutral Pt(NO) species adopts a bent 2A' ground state, while the cationic [Pt(NO)]+ species adopts a linear 1Σ+ ground state. The B3LYP/SDD- predicted Pt-N bond lengths are 2.016 and 1.777 Å for Pt(NO) (2A') and [Pt(NO)]+ (1Σ+), respectively, while the ∠Pt-N-O bent angle for [Pt(NO)] (2A') is 119.6°. On the other hand, the anionic [Pt(NO)]- species adopts the bent 1A' ground state with a Pt-N bond length of 1.867 Å and a ∠Pt-N-O bent angle of 122.5°. The computed binding energies of the NO, NO+ and NO- ligands with Pt(0) were found to be 29.9 (32.8), 69.9 (78.4) and 127.4 (128.7) kcal/mol at the B3LYP/SDD and CCSD(T)/SDD (numbers in parentheses) levels of theory, respectively. Moreover, the structure of the [Pt(NO2)]+ component of the Pt(NO)/Pt(NO2) redox couple and its transformation to [Pt(NO)]+ upon reaction with CO was analysed in the framework of the DFT theory. The coordination of the CO ligand to [Pt(NO2)]+ affords the cationic mixed-ligand [Pt(CO)(NO2)]+ complex, which is stabilized by 66.6 (60.5) kcal/mol, with respect to the separated [Pt(NO2)]+ and CO in their ground states. The O-transfer reaction from the coordinated NO2 to the coordinated CO ligands in the presence of the [Pt(NO2)]+ species corresponds to an exothermic process; the heat of the reaction (∆RH) is -85.2 (-80.5) kcal/mol and the activation barrier amounts to 27.7 (33.0) kcal/mol. Finally, the equilibrium structures of selected stationary points related to the transformation of NO to NO2 ligand located on the potential energy surfaces of the [Pt(NO),O2], [Pt(NO)+,O2], and [Pt(NO)-,O2] systems were analysed in the framework of the DFT theory. The computed interaction energies of O2 with Pt(NO), [Pt(NO)]+ and [Pt(NO)]- species were found to be 106.9 (105.3), 49.2 (48.4) and 26.9 (26.5) kcal/mol, respectively. The O2 ligand is coordinated to the Pt central atom in an end-on mode for [Pt(NO),O2] and [Pt(NO)-,O2] systems and in a side-on mode for the [Pt(NO)+,O2] system. The transformation of NO to NO2 in [Pt(NO)]- species upon reaction with dioxygen corresponds to an exothermic process; the heat of the reaction (∆RH) is -60.6 (-55.8) kcal/mol, while the activation barrier amounts to 35.5 (30.2) kcal/mol. Calculated structures, relative stability and bonding properties of all stationary points are discussed with respect to computed electronic and spectroscopic properties, such as charge density distribution and harmonic vibrational frequencies.

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31

LUCAS, C. A., N. M. MARKOVIC y P. N. ROSS. "STRUCTURAL EFFECTS INDUCED BY CO ADSORPTION ON Pt–BIMETALLIC SURFACES". Surface Review and Letters 06, n.º 05 (octubre de 1999): 917–22. http://dx.doi.org/10.1142/s0218625x99000986.

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Synchrotron surface X-ray scattering (SXS) studies have been performed during the coadsorption of metal adatoms and carbon monoxide on single crystal Pt surfaces in an electrochemical environment. As the applied electrode potential is the driving force behind adsorption, the electrochemical system is in chemical equilibrium, which results in a range of structural phenomena, such as mixing, segregation, compression and displacement. The mechanisms behind these effects are studied by monitoring the diffraction signals from ordered adsorbed metal and CO adlayers that occur on the Pt(111) and Pt(100) surfaces.

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32

Huang, Xiang-Jun, Yi-Guo Tang, Long-Fei Yang, Ping Chen, Qing-Sheng Wu y Zhen Pan. "CMK3/graphene-N-Co – a low-cost and high-performance catalytic system". Journal of Materials Chemistry A 3, n.º 6 (2015): 2978–84. http://dx.doi.org/10.1039/c4ta06184e.

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The CMK3/G-N-Co catalytic system shows excellent catalytic ability in alkaline media for the oxygen reduction reaction and superior stability and tolerance to methanol poisoning effects compared to the Pt/C.

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33

Wang, Pengyun, Lei Wei, Shuye Yang, Xuebo Dong, Zhen Wang, Liang Li y Xianqi Zhang. "Facile designed poly(lactic-co-glycolic acid)-containing nano-platform carried dual drug system to improve progressive combination cancer therapy against human osteosarcoma cells". Materials Express 10, n.º 10 (31 de octubre de 2020): 1599–606. http://dx.doi.org/10.1166/mex.2020.1821.

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We have designed a methodology to achieve treatment-actuated modifications in a tumor microenvironment by utilizing synergistic activity between two potential anticancer drugs. Dual drug delivery of Sorafenib (Sf) along with Cisplatin (Pt) exhibits a great anti-cancer potential, as Sf enhances the effect of Pt treatment of human osteosarcoma cells by providing microenvironment stability. However, encapsulation of Sf and Pt obsessed by poly(lactic-co-glycolic acid (PLGA)-based nanoparticles (PLGA-NPs) is incompetent owing to unsuitability between the binary free Sf and Pt moieties and the polymeric system. Now, we display that Pt can be prepared by hydrophobic covering of the drug centers with dioleoylphosphatidic acid (DOPA). The DOPA-covered Pt centers can be co-encapsulated in PLGA NPs alongside Sf to stimulate excellent anticancer property. The occurrence of the Pt centers suggestively enhanced the encapsulations of Sf into PLGA-NPs. Formation of the nanocomposite (Pt-Sf@PLGA-NPs) was confirmed by FTIR and X-ray spectroscopic techniques. Further, the morphology of Pt-Sf@PLGA-NPs and nanoparticle size was examined by scanning electron microscopic and transmission microscopy, respectively. Furthermore, Pt-Sf@PLGA-NPs induced significant apoptosis in human osteosarcoma MG-63 and U2OS cancer cells in vitro. The results suggest that Pt-Sf@PLGA-NPs are one of the promising human osteosarcoma cancer therapeutic candidates worthy of further investigations.

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34

Berkei, Michael, Jamie F. Bickley y Brian T. Heaton. "Crystal Structure of Tetrabutylammonium Carbonyltribromoplatinate(II) [(C4H9)4N][PtBr3(CO)]". Zeitschrift für Naturforschung B 57, n.º 6 (1 de junio de 2002): 610–14. http://dx.doi.org/10.1515/znb-2002-0603.

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AbstractTetrabutylammonium carbonyltribromoplatinate(II) [(C4H9)4N][PtBr3(CO)] crystallises in the monoclinic system in the space group P21/n with a = 1487.84(13), b = 897.41(8), c = 1849.6(2) pm, β = 106.558(2)° and four formula units per unit cell. The [PtBr3 (CO)]- anion is symmetrical (C2v) and almost planar with Pt-Br bond lengths of 242.40(12) pm (trans to CO), 243.25(10) pm and 242.99(9) pm (trans to Br), and a Pt-C bond length of 185.6(11) pm.

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35

Hirai, Takamasa, Tomohiro Koyama, Aya Obinata, Yuki Hibino, Kazumoto Miwa, Shimpei Ono, Makoto Kohda y Daichi Chiba. "Control of magnetic anisotropy in Pt/Co system using ionic liquid gating". Applied Physics Express 9, n.º 6 (17 de mayo de 2016): 063007. http://dx.doi.org/10.7567/apex.9.063007.

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36

Kim, DongEung, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du y Zi-Kui Liu. "Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system". Calphad 35, n.º 3 (septiembre de 2011): 323–30. http://dx.doi.org/10.1016/j.calphad.2011.04.005.

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37

Gu, Z. F., CH F. Xu, Q. Y. Han, G. Cheng y Z. F. Huang. "Phase relationships in the Co–Pt–Nd ternary system at 773 K". Phase Transitions 83, n.º 4 (abril de 2010): 244–50. http://dx.doi.org/10.1080/01411591003680625.

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38

Todorova, Silviya, Anton Naydenov, Maya Shopska, Hristo Kolev, Iliyana Yordanova y Krasimir Tenchev. "Pt-Modified Nano-Sized Mn2O3 Oxide Prepared from the Mn3O4 Phase with Tetragonal Symmetry for CO Oxidation". Symmetry 14, n.º 12 (1 de diciembre de 2022): 2543. http://dx.doi.org/10.3390/sym14122543.

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One of the current problems in the environmental catalysis is the design of an effective and less costly catalytic system for the oxidation of CO. The nano-sized α-Mn2O3 oxide has been prepared and modified with 0.5 wt.% Pt. The catalysts have been characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), temperature-programmed reduction (TPR) and diffuse-reflectance infrared spectroscopy (DRIFTS). Finely divided PtO and Pt(OH)2 are being formed on the Mn2O3 surface as a result of the strong interaction between platinum and the nano-oxide. Based on DRIFTS investigations and the model calculations, a Langmuir–Hinshelwood type of mechanism is supposed for CO oxidation on Pt/Mn2O3. The CO and oxygen are adsorbed on different types of sites. The Mars–van Krevelen mechanism is the most probable one over pure Mn2O3, thus suggesting that CO2 is adsorbed on the oxidized sites. The CO adsorption in the mixture CO + N2 or in the presence of oxygen (CO + N2 + O2) leads to a partial reduction in the Pt+ surface species and the formation of linear Pt1+−CO and Pt0−CO carbonyls. Both of them take part in the CO oxidation reaction.

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39

Pavlukhina, Oksana, Vladimir Sokolovskiy, Mikhail Zagrebin y Vasily Buchelnikov. "Investigation of structural and magnetic properties of Fe-Rh-(Z) (Z = Co, Pt) alloys by first principles method". EPJ Web of Conferences 185 (2018): 05005. http://dx.doi.org/10.1051/epjconf/201818505005.

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In this work, we present theoretical investigations of the structural and magnetic properties Fe (Rh, Co) and Fe (Rh, Pt) alloys using the density functional theory. The energy calculations were performed for the 16-atom supercell (Fe8Rh8-xZx) with different initial spin configurations. It is shown that a small variation of Pt or Co content leads to change the type of magnetic ordering. It is shown that the ferromagnetic configuration of Fe8Rh8-xCox (x=2, 3) is more energetically favorable as compared with other configurations in austenite. The antiferromagnetic configuration is more energetically favorable for Fe8Rh7Co1 alloy. For the Fe8Rh8-xPtx system, the checkerboard-like antiferromagnetic configuration was found to be more energetically favorable. Besides, the addition of Pt into Fe-Rh system slightly changes the optimized lattice parameter and stimulates the martensitic phase transformation.

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40

Wang, Haiyang, Ruijuan Yao, Ruiyin Zhang, Hao Ma, Jianjing Gao, Miaomiao Liang, Yuzhen Zhao y Zongcheng Miao. "CeO2-Supported TiO2−Pt Nanorod Composites as Efficient Catalysts for CO Oxidation". Molecules 28, n.º 4 (16 de febrero de 2023): 1867. http://dx.doi.org/10.3390/molecules28041867.

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Supported Pt-based catalysts have been identified as highly selective catalysts for CO oxidation, but their potential for applications has been hampered by the high cost and scarcity of Pt metals as well as aggregation problems at relatively high temperatures. In this work, nanorod structured (TiO2−Pt)/CeO2 catalysts with the addition of 0.3 at% Pt and different atomic ratios of Ti were prepared through a combined dealloying and calcination method. XRD, XPS, SEM, TEM, and STEM measurements were used to confirm the phase composition, surface morphology, and structure of synthesized samples. After calcination treatment, Pt nanoparticles were semi-inlayed on the surface of the CeO2 nanorod, and TiO2 was highly dispersed into the catalyst system, resulting in the formation of (TiO2−Pt)/CeO2 with high specific surface area and large pore volume. The unique structure can provide more reaction path and active sites for catalytic CO oxidation, thus contributing to the generation of catalysts with high catalytic activity. The outstanding catalytic performance is ascribed to the stable structure and proper TiO2 doping as well as the combined effect of Pt, TiO2, and CeO2. The research results are of importance for further development of high catalytic performance nanoporous catalytic materials.

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41

Hibino, Y., T. Hirai, K. Hasegawa, T. Koyama y D. Chiba. "Enhancement of the spin-orbit torque in a Pt/Co system with a naturally oxidized Co layer". Applied Physics Letters 111, n.º 13 (25 de septiembre de 2017): 132404. http://dx.doi.org/10.1063/1.4995292.

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42

Emmanuel, Jovine y Brian Hayden. "Carbon Monoxide Oxidation on Model Planar Titania Supported Platinum Nanoparticles Catalyst". Tanzania Journal of Science 48, n.º 2 (17 de junio de 2022): 235–44. http://dx.doi.org/10.4314/tjs.v48i2.1.

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A high-throughput (parallel) thermographic screening methodology was developed to enable the measurements of the particle size and support influence on heterogeneous catalysts. A high throughput screening chip has been used to establish the catalytic activity of titania supported platinum nanoparticles catalyst for CO oxidation reaction. The catalytic activity of Pt nanoparticles between 1.3 to 7.8 nm has been investigated for CO conversion at a pressure of 0.11 and 1.1 mbar with O2:CO ratio of 1:1 at 80 °C and 0.6, 1.1 and 2.4 mbar at O2:CO ratio of 1:1 at 240 °C. At these experimental conditions, there was an increase in the TOF with decreasing particle size for instance, at 80 °C and O2:CO ratio of 1:1, total pressure of 0.11 and 1.1 mbar, the TOF increased from 0.01 s–1 to 0.171 s–1 with decreasing Pt particle size from 7.8 to 1.3 nm, respectively. However, Pt nanoparticles catalyst displayed higher activity at higher temperature, for example, the TOF increased from 3.312 s–1 to 4.355 s–1 at O2:CO ratio of 1:1, total pressure of 0.6 and 1.1 mbar, respectively, for Pt particle size of 1.3 nm in agreement with the previous reports. Results show that CO oxidation on titania supported Pt nanoparticles catalyst is particle size dependent. On the other hand, findings from XPS measurements show no major change in the particle size after the reaction thus, reflecting the stability of Pt particles. While there is no apparent consensus in the literature reports on the activity trend with particle size for this system, these findings are consistent with most of the previously reported findings. Keywords: platinum; titania; nanoparticles; thermography; CO oxidation.

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43

Дорохин, М. В., П. Б. Дёмина, А. В. Здоровейщев, Д. А. Здоровейщев, А. Г. Темирязев, М. П. Темирязева, И. Л. Калентьева y В. Н. Трушин. "Управление микромагнитной структурой многофазных тонких пленок CoPt путем варьирования толщин слоев". Физика твердого тела 65, n.º 6 (2023): 989. http://dx.doi.org/10.21883/ftt.2023.06.55655.15h.

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The magnetic properties and micromagnetic structure of [Co/Pt]10 multilayer magnetic films formed by independent variation of the Co and Pt layer thicknesses have been studied. The possibility of the film magnetization parameters manipulation was shown. It is found that the micromagnetic structure of the layers is significantly modified with a change in the thickness of the layers which correlates with the magnetization data. In particular, magnetic force microscopy revealed a system of magnetic skyrmions for a number of structures. The skyrmion density was found to be dependent on the growth conditions which in turn correlates with the shape of the magnetic hysteresis loop. Changing the thickness of the Co and Pt layers makes it possible to control the density of skyrmions in the range from 0.2 to 10.5 µm-2.

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44

Wu, S., T. L. Jin, F. N. Tan, C. C. I. Ang, H. Y. Poh, G. J. Lim y W. S. Lew. "Enhancement of spin–orbit torque in Pt/Co/HfOx heterostructures with voltage-controlled oxygen ion migration". Applied Physics Letters 122, n.º 12 (20 de marzo de 2023): 122403. http://dx.doi.org/10.1063/5.0139443.

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Spin–orbit torque (SOT) induced magnetization switching and SOT modulation by interfacial coupling exhibit good potential in spintronic devices. In this work, we report the enhancement of damping-like field and SOT efficiency of up to 60% and 23%, respectively, in perpendicularly magnetized Pt/Co/HfOx heterostructures over a Pt/Co system at an optimal thickness of 2 nm HfOx. The SOT improvement is primarily attributed to the interfacial oxidization of the Co layer, and the strength is tunable via voltage-induced oxygen ion migration at the Co/HfOx interface. Our measurement reveals that by controlling gate voltages, the Co oxidation can be increased, which leads to the SOT efficiency enhancement. Our work promotes the SOT enhancement and modulation by oxidation effects for energy-efficient spintronic devices.

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45

Koyama, Tomohiro, Aya Obinata, Yuki Hibino y Daichi Chiba. "Sign Reversal of Electric Field Effect on Coercivity in MgO/Co/Pt System". Applied Physics Express 6, n.º 12 (1 de diciembre de 2013): 123001. http://dx.doi.org/10.7567/apex.6.123001.

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46

Koyama, T., Y. Nakatani y D. Chiba. "Chirality-induced effective field in Pt/Co/MgO system with spatial anisotropy-modulation". Applied Physics Letters 120, n.º 17 (25 de abril de 2022): 172402. http://dx.doi.org/10.1063/5.0089015.

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In a perpendicularly magnetized (PM) material with the interfacial Dzyaloshinskii–Moriya interaction (iDMI), a chirality-induced effective magnetic field (EMF) acts on a magnetic domain wall, which is a naturally formed in-plane magnetized (IM) region sandwiched by perpendicular (PM) regions. In this study, we artificially created a Pt/Co/MgO system with the regions exhibiting different anisotropy, that is, IM and PM regions, and the chirality-induced EMF at the PM/IM boundary was investigated using it. The EMF in the IM region was probed using magnetoresistance (MR) measurements. When the field was applied orthogonally to the wire, a unidirectional shift of the MR curve was observed, indicating that the EMF exists in the IM region. The dependence of the EMF on the width of the IM region suggests that the EMF acts dominantly on the magnetization near the PM/IM boundary. Moreover, the sign of the shift is reversed with reversing the PM direction. The sign and magnitude of the EMF observed in this study suggest that the EMF in the present system is caused by iDMI.

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47

Koyama, T., Y. Nakatani y D. Chiba. "Chirality-induced effective field in Pt/Co/MgO system with spatial anisotropy-modulation". Applied Physics Letters 120, n.º 17 (25 de abril de 2022): 172402. http://dx.doi.org/10.1063/5.0089015.

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In a perpendicularly magnetized (PM) material with the interfacial Dzyaloshinskii–Moriya interaction (iDMI), a chirality-induced effective magnetic field (EMF) acts on a magnetic domain wall, which is a naturally formed in-plane magnetized (IM) region sandwiched by perpendicular (PM) regions. In this study, we artificially created a Pt/Co/MgO system with the regions exhibiting different anisotropy, that is, IM and PM regions, and the chirality-induced EMF at the PM/IM boundary was investigated using it. The EMF in the IM region was probed using magnetoresistance (MR) measurements. When the field was applied orthogonally to the wire, a unidirectional shift of the MR curve was observed, indicating that the EMF exists in the IM region. The dependence of the EMF on the width of the IM region suggests that the EMF acts dominantly on the magnetization near the PM/IM boundary. Moreover, the sign of the shift is reversed with reversing the PM direction. The sign and magnitude of the EMF observed in this study suggest that the EMF in the present system is caused by iDMI.

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48

Koyama, T., Y. Nakatani y D. Chiba. "Chirality-induced effective field in Pt/Co/MgO system with spatial anisotropy-modulation". Applied Physics Letters 120, n.º 17 (25 de abril de 2022): 172402. http://dx.doi.org/10.1063/5.0089015.

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In a perpendicularly magnetized (PM) material with the interfacial Dzyaloshinskii–Moriya interaction (iDMI), a chirality-induced effective magnetic field (EMF) acts on a magnetic domain wall, which is a naturally formed in-plane magnetized (IM) region sandwiched by perpendicular (PM) regions. In this study, we artificially created a Pt/Co/MgO system with the regions exhibiting different anisotropy, that is, IM and PM regions, and the chirality-induced EMF at the PM/IM boundary was investigated using it. The EMF in the IM region was probed using magnetoresistance (MR) measurements. When the field was applied orthogonally to the wire, a unidirectional shift of the MR curve was observed, indicating that the EMF exists in the IM region. The dependence of the EMF on the width of the IM region suggests that the EMF acts dominantly on the magnetization near the PM/IM boundary. Moreover, the sign of the shift is reversed with reversing the PM direction. The sign and magnitude of the EMF observed in this study suggest that the EMF in the present system is caused by iDMI.

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49

Liu, Jin-jun, Da-yin Hua y Luo-luo Jiang. "Effect of Surface Impurities on Oscillation in NO+CO/Pt(100) Reaction System". Chinese Journal of Chemical Physics 20, n.º 3 (junio de 2007): 279–84. http://dx.doi.org/10.1088/1674-0068/20/03/279-284.

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50

Kashyap, Arti, K. B. Garg, A. K. Solanki, T. Nautiyal y S. Auluck. "Electronic structure, Fermi surface, and Curie temperature calculations for the Co-Pt system". Physical Review B 60, n.º 4 (15 de julio de 1999): 2262–67. http://dx.doi.org/10.1103/physrevb.60.2262.

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