Journal articles: 'Platinum-zinc'

1

Moser, Z. "The Pt-Zn (Platinum-Zinc) system." Journal of Phase Equilibria 12, no. 4 (August 1991): 439–43. http://dx.doi.org/10.1007/bf02645964.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Julsing, H. G., and R. I. McCrindle. "The recovery of precious metals from acidic effluents using sodium formate." Water Science and Technology 42, no. 5-6 (September 1, 2000): 63–69. http://dx.doi.org/10.2166/wst.2000.0496.

Full text

Abstract:

At Western Platinum Refinery in South Africa, zinc was used for the reduction of the platinum group metals (PGMs) in acidic effluent (palladium filtrate). Owing to the increasing cost of zinc and the risk of zinc pollution, sodium formate was investigated as an alternative reductant. It was found that pH 1.5 was the optimum starting pH for sodium formate reduction. The optimum concentration of sodium formate was found to be 18 g/dm3 at a temperature of approximately 100°C where the process time was 5 hours. The addition of sodium formate increased the pH of the final reaction mixture to approximately pH 4.5. Palladium was the most effectively reduced PGM, exhibiting an average precipitation efficiency of 98%. Difficulty was experienced with the precipitation of platinum (average precipitation efficiency of 47%). The precipitated PGMs were readily dissolved in hydrochloric acid (6 M) and sodium chlorate (2%). A reduction in costs resulted from the discontinuation of the use of zinc for reduction purposes. An additional advantage was that zinc was no longer introduced into the PGM refinery circuits. This effectively reduced the pollution potential of the acidic effluent.

APA, Harvard, Vancouver, ISO, and other styles

3

Du, Zhifeng, Raphael E. F. de Paiva, Yun Qu, and Nicholas Farrell. "Tuning the reactivity of Sp1 zinc fingers with platinum complexes." Dalton Transactions 45, no. 21 (2016): 8712–16. http://dx.doi.org/10.1039/c6dt01128d.

Full text

Abstract:

The microenvironment around a zinc finger coordination unit affects the reactivity of apparently similar ZFs with Lewis acid platinum electrophiles. The unique dicysteine-bridged dinuclear platinum unit is the product of the reaction of [PtCl₂(en)] and the F3 of the transcription factor Sp1.

APA, Harvard, Vancouver, ISO, and other styles

4

Phillips-Chavez, Caitlin, Jermaine Coward, Michael Watson, and Janet Schloss. "A Retrospective Cross-Sectional Cohort Trial Assessing the Prevalence of MTHFR Polymorphisms and the Influence of Diet on Platinum Resistance in Ovarian Cancer Patients." Cancers 13, no. 20 (October 18, 2021): 5215. http://dx.doi.org/10.3390/cancers13205215.

Full text

Abstract:

Ovarian cancer has the lowest survival rate in gynaecologic malignancies with a 5-year survival rate of 43%. Platinum resistance is one of the main drivers of ovarian cancer mortality, of which aberrant methylation has been cited as a significant contributor. Understanding the essential role of the methylenetetrahydrofolate reductase enzyme (MTHFR) on DNA synthesis and repair, and how nutrient status can vastly affect its performance, led to the investigation of MTHFR status and dietary influence on platinum response in epithelial ovarian cancer (EOC) patients. Twenty-five adult female patients who completed first-line platinum-based chemotherapy for primary ovarian cancer were selected from Icon Cancer Centres in Australia. Participants were grouped based on platinum response. A full medical and family history, food frequency questionnaire and single blood test were completed, testing for MTHFR polymorphisms, serum folate, serum and active B12 and homocysteine levels. Nineteen of twenty-five participants had an MTHFR polymorphism. Of those, 20% were compound heterozygous, 12% were heterozygous C677T (CT), 4% homozygous C677T, 12% homozygous A1298C and 28% were heterozygous A1298C (AC). Statistically significant associations were found between dietary zinc (p = 0.0086; 0.0030; 0.0189) and B12 intakes in CT genotypes (p = 0.0157; 0.0030; 0.0068) indicating that zinc or vitamin B12 intakes below RDI were associated with this genotype. There were strong associations of vitamin B6 intakes in AC genotypes (p = 0.0597; 0.0547; 0.0610), and dietary folate in compound heterozygotes with sensitive and partially sensitive disease (p = 0.0627; 0.0510). There were also significant associations between serum folate (p = 0.0478) and dietary B12 (p = 0.0350) intakes above RDI and platinum sensitivity in wild-types as well as strong associations with homocysteine levels (p = 0.0886) and zinc intake (p = 0.0514). Associations with dietary B12 (p = 0.0514) and zinc intakes (p = 0.0731) were also strong in resistant wild types. Results indicate that dietary zinc, B12 and B6 intakes may be associated with platinum sensitivity dependent on MTHFR genotype. These results require further research to clarify the dosages necessary to elicit a response; however, they provide a novel foundation for acknowledging the role of diet on treatment response in EOC.

APA, Harvard, Vancouver, ISO, and other styles

5

Jha, Pankaj Kumar, Chamorn Chawengkijwanich, Kuaanan Techato, Warakorn Limbut, and Montri Luengchavanon. "Callistemon viminalis Leaf Extract Mediated Biosynthesis of Ag, rGO-Ag-ZnO Nanomaterials for Catalytic PEM Fuel Cell Application." Trends in Sciences 19, no. 11 (June 3, 2022): 493. http://dx.doi.org/10.48048/tis.2022.493.

Full text

Abstract:

Cost-effective manufacture of hydrogen proton exchange membrane fuel cells (PEM-fuel cells) is of much interest to concerned researchers. Platinum metal has already shown good performance in the PEM fuel cell, yet its high cost means that it is not affordable to all nations. This paper identifies ways to reduce the cost by replacing platinum-based PEM fuel cells with synthesised eco-friendly silver (Ag) nanoparticles and reducing graphene oxide coated silver composited zinc oxide (rGO/Ag-ZnO) nanomaterials. Ag nanoparticles and reduced graphene oxide coated silver composited zinc oxide nanomaterials were synthesised using Callistemon viminalis leaf extract. PEM fuel cell modification was achieved using newly biosynthesised nanomaterials, while power density was compared with commercial platinum metal-based PEM fuel cells. The present study shows that modified PEM fuel cells can replace commercial platinum-based PEM fuel cells for cost-effective hydrogen proton exchange membrane fuel cells. HIGHLIGHTS Reduced graphene oxide coated Ag-ZnO nanomaterials formed by Callistemon viminalis, low-cost PEM fuel cell which uses rGO-Ag-ZnO nanoparticle. GRAPHICAL ABSTRACT

APA, Harvard, Vancouver, ISO, and other styles

6

Sangun, Mustafa Kemal, and Guray Kilincceker. "Investigation of Hydrogen Production by using Zinc Coated Platinum Electrode in Phosphate Solutions." French-Ukrainian Journal of Chemistry 7, no. 1 (2019): 16–24. http://dx.doi.org/10.17721/fujcv7i1p16-24.

Full text

Abstract:

In this study, the hydrogen gas producing was investigated at 298 K with zinc coated platinum (Pt-Zn) electrode in 0.1 M NaH2PO4 solution (pH=12.3). Electrolysis, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques were used for the production of hydrogen gas. Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray fluorescence (XRF) were used for the surface analysis of the electrodes. A practical electrocatalytic experiment was designed to examine of hydrogen production by using a Zn plated Pt electrode and the efficiency of the hydrogen gas increased by 66.66% on the surface of the zinc coated platinum electrode.

APA, Harvard, Vancouver, ISO, and other styles

7

Li, Zhao, Wenhan Niu, Zhenzhong Yang, Nusaiba Zaman, Widitha Samarakoon, Maoyu Wang, Abdelkader Kara, et al. "Stabilizing atomic Pt with trapped interstitial F in alloyed PtCo nanosheets for high-performance zinc-air batteries." Energy & Environmental Science 13, no. 3 (2020): 884–95. http://dx.doi.org/10.1039/c9ee02657f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Kita, Yu, and Yutaka Amao. "pH-Controlled selective synthesis of lactate from pyruvate with a photoredox system of water-soluble zinc porphyrin, an electron mediator and platinum nanoparticles dispersed by polyvinylpyrrolidone." Sustainable Energy & Fuels 5, no. 23 (2021): 6004–13. http://dx.doi.org/10.1039/d1se01399h.

Full text

Abstract:

The pH-controlled visible-light driven selective pyruvate reduction to lactate with a system of triethanolamine, zinc tetraphenylporphyrin tetrasulfonate, methylviologen and colloidal platinum nanoparticles was achieved.

APA, Harvard, Vancouver, ISO, and other styles

9

Kononova, Olga, Nataliya Karplyakova, and Evgeniya Duba. "Sorption recovery of platinum (II, IV) in presence of copper (II) and zinc (II) from chloride solutions." Journal of the Serbian Chemical Society 80, no. 9 (2015): 1149–60. http://dx.doi.org/10.2298/jsc141217018k.

Full text

Abstract:

The sorption preconcentration of platinum (II, IV) ions was investigated in presence of accompanying copper (II) and zinc (II) ions from chloride solutions on the new ion exchangers CYBBER (Russia), previously unexplored. The initial concentrations of platinum and accompanying ions were 0.25 mmol L-1 and 2.0 mmol L-1, respectively, and the acidity of medium was 0.001 - 4.0 mol L-1. It was shown that the resins investigated - strong and weak basic anion exchangers as well as chelate ion exchangers - possess good sorption and kinetic properties. The simultaneous sorption of investigated ions results in the complete recovery of platinum, while the non-ferrous metal ions are sorbed at less than 20%. Followed by the selective elution of platinum by thiourea (80 g L-1) solution in 0.3 M H2SO4, the quantitative isolation of platinum was achieved (more than 90%). Therefore, the studied ion exchangers can be recommended for recovery and separation of Pt(II,IV), Cu(II) and Zn(II) ions.

APA, Harvard, Vancouver, ISO, and other styles

10

Vodyanoy, Vitaly. "The Role of Endogenous Metal Nanoparticles in Biological Systems." Biomolecules 11, no. 11 (October 23, 2021): 1574. http://dx.doi.org/10.3390/biom11111574.

Full text

Abstract:

The blood and tissues of vertebrate animals and mammals contain small endogenous metal nanoparticles. These nanoparticles were observed to be composed of individual atoms of iron, copper, zinc, silver, gold, platinum, and other metals. Metal nanoparticles can bind proteins and produce proteinaceous particles called proteons. A small fraction of the entire pool of nanoparticles is usually linked with proteins to form proteons. These endogenous metal nanoparticles, along with engineered zinc and copper nanoparticles at subnanomolar levels, were shown to be lethal to cultured cancer cells. These nanoparticles appear to be elemental crystalline metal nanoparticles. It was discovered that zinc nanoparticles produce no odor response but increase the odor reaction if mixed with an odorant. Some other metal nanoparticles, including copper, silver, gold, and platinum nanoparticles, do not affect the responses to odorants. The sources of metal nanoparticles in animal blood and tissues may include dietary plants and gut microorganisms. The solid physiological and biochemical properties of metal nanoparticles reflect their importance in cell homeostasis and disease.

APA, Harvard, Vancouver, ISO, and other styles

11

Nien, Yu-Hsun, Zhi-Xuan Kang, Tzu-Yu Su, Chih-Sung Ho, Jung-Chuan Chou, Chih-Hsien Lai, Po-Yu Kuo, et al. "Investigation of Flexible Arrayed Lactate Biosensor Based on Copper Doped Zinc Oxide Films Modified by Iron–Platinum Nanoparticles." Polymers 13, no. 13 (June 23, 2021): 2062. http://dx.doi.org/10.3390/polym13132062.

Full text

Abstract:

Potentiometric biosensors based on flexible arrayed silver paste electrode and copper-doped zinc oxide sensing film modified by iron-platinum nanoparticles (FePt NPs) are designed and manufactured to detect lactate in human. The sensing film is made of copper-doped zinc oxide (CZO) by a radio frequency (RF) sputtering system, and then modified by iron-platinum nanoparticles (FePt NPs). The surface morphology of copper-doped zinc oxide (CZO) is analyzed by scanning electron microscope (SEM). FePt NPs are analyzed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The average sensitivity, response time, and interference effect of the lactate biosensors are analyzed by voltage-time (V-T) measurement system. The electrochemical impedance is analyzed by electrochemical impedance spectroscopy (EIS). The average sensitivity and linearity over the concentration range 0.2–5 mM are 25.32 mV/mM and 0.977 mV/mM, respectively. The response time of the lactate biosensor is 16 s, with excellent selectivity.

APA, Harvard, Vancouver, ISO, and other styles

12

Hongsith, Niyom, and Supab Choopun. "Effect of Platinum Impregnation on ZnO Tetrapods for Ethanol Sensor." Advanced Materials Research 55-57 (August 2008): 289–92. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.289.

Full text

Abstract:

Platinum impregnated ZnO tetrapods were prepared and studied for the detection of ethanol vapor. ZnO tetrapods were synthesized by oxidation reaction technique by heating a mixer of zinc powder (99.99%) and hydrogen peroxide solution (30 wt.%) at 1,000oC in air. Platinum was impregnated by dropping hydrogen hexachloroplatinate (IV) hydrate, H2Cl6Pt.aq, solution with different concentration on ZnO tetrapods and then, heated at 350oC for 1 hr. The platinum impregnated ZnO tetrapods were characterized by field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS) for morphology and chemical composition, respectively. The particles were observed on the surface of ZnO tetrapods. The EDS spectrum suggested that the particles were platinum. Platinum impregnated ZnO tetrapods were tested ethanol sensing properties under ethanol concentration of 50-1,000 ppm. The ethanol sensing results indicated that the sensitivity of the sensors depended on the platinum impregnated concentration. Moreover, the sensors based on platinum impregnated ZnO tetrapods of 0.035 wt.% exhibited higher sensitivity compare to those of non-impregnation ZnO tetrapods.

APA, Harvard, Vancouver, ISO, and other styles

13

Liberman-Martin, Allegra L., Daniel S. Levine, Micah S. Ziegler, Robert G. Bergman, and T. Don Tilley. "Lewis acid–base interactions between platinum(ii) diaryl complexes and bis(perfluorophenyl)zinc: strongly accelerated reductive elimination induced by a Z-type ligand." Chemical Communications 52, no. 43 (2016): 7039–42. http://dx.doi.org/10.1039/c6cc02433e.

Full text

Abstract:

Z-type interactions between bis(perfluorophenyl)zinc and platinum(ii) diaryl complexes supported by 1,10-phenanthroline (phen), 2,2′-bipyridine (bpy), and bis(dimethylphosphino)ethane (dmpe) ligands are reported.

APA, Harvard, Vancouver, ISO, and other styles

14

Liu, Qin, Melissa Golden, Marcetta Y. Darensbourg, and Nicholas Farrell. "Thiolate-bridged heterodinuclear platinum–zinc chelates as models for ternary platinum–DNA–protein complexes and zinc ejection from zinc fingers. Evidence from studies using ESI-mass spectrometry." Chemical Communications, no. 34 (2005): 4360. http://dx.doi.org/10.1039/b507751f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Chong, Lina, Jianguo Wen, Joseph Kubal, Fatih G. Sen, Jianxin Zou, Jeffery Greeley, Maria Chan, Heather Barkholtz, Wenjiang Ding, and Di-Jia Liu. "Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks." Science 362, no. 6420 (November 8, 2018): 1276–81. http://dx.doi.org/10.1126/science.aau0630.

Full text

Abstract:

Achieving high catalytic performance with the lowest possible amount of platinum is critical for fuel cell cost reduction. Here we describe a method of preparing highly active yet stable electrocatalysts containing ultralow-loading platinum content by using cobalt or bimetallic cobalt and zinc zeolitic imidazolate frameworks as precursors. Synergistic catalysis between strained platinum-cobalt core-shell nanoparticles over a platinum-group metal (PGM)–free catalytic substrate led to excellent fuel cell performance under 1 atmosphere of O2 or air at both high-voltage and high-current domains. Two catalysts achieved oxygen reduction reaction (ORR) mass activities of 1.08 amperes per milligram of platinum (A mgPt−1) and 1.77 A mgPt−1 and retained 64% and 15% of initial values after 30,000 voltage cycles in a fuel cell. Computational modeling reveals that the interaction between platinum-cobalt nanoparticles and PGM-free sites improves ORR activity and durability.

APA, Harvard, Vancouver, ISO, and other styles

16

ABE, TOSHIYUKI, HIROSHI IMAYA, SUMIO TOKITA, DIETER WöHRLE, and MASAO KANEKO. "Photoelectrochemical Proton Reduction with Coated Zinc Tetraphenylporphin Dispersed into Poly(4-vinylpyridine)." Journal of Porphyrins and Phthalocyanines 01, no. 03 (July 1997): 215–20. http://dx.doi.org/10.1002/(sici)1099-1409(199707)1:3<215::aid-jpp5>3.0.co;2-j.

Full text

Abstract:

Photoelectrochemical proton reduction for H 2 production was found with zinc tetraphenylporphin ( ZnTPP ) dispersed into a poly(4-vinylpyridine) ( PVP ) membrane coated on a platinum electrode ( Pt / PVP [ ZnTPP ]) and dipped in an aqueous solution. The photocurrent in the Pt / PVP [ ZnTPP ] system was generated in the potential region below −0.40 V (vs. Ag / AgCl ). The action spectrum of the photocurrent showed that the photoelectrochemical event is induced by the excitation of ZnTPP . The singlet lifetime of the PVP [ ZnTPP ] system under the applied potential of −0.45 V (vs. Ag / AgCl ) is shorter than that without the applied potentials, showing that the singlet ZnTPP * species is quenched reductively to ZnTPP − by electron injection from the platinum electrode. The proton is catalytically reduced to H 2 by ZnTPP − supposedly on the platinum surface.

APA, Harvard, Vancouver, ISO, and other styles

17

Mori, Kousuke, Yasuharu Kanda, and Yoshio Uemichi. "Dehydrogenation of Methylcyclohexane over Zinc-containing Platinum/Alumina Catalysts." Journal of the Japan Petroleum Institute 61, no. 6 (November 1, 2018): 350–56. http://dx.doi.org/10.1627/jpi.61.350.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

YARITA, Somei, and Katsutsugu KITADA. "Characterization of Alkaline Platinum-Zinc Alloy Plating Bath Deposits." Journal of the Surface Finishing Society of Japan 49, no. 1 (1998): 88–91. http://dx.doi.org/10.4139/sfj.49.88.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Zawadzki, M., W. Miśta, and L. Kępiński. "Metal-support effects of platinum supported on zinc aluminate." Vacuum 63, no. 1-2 (July 2001): 291–96. http://dx.doi.org/10.1016/s0042-207x(01)00204-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Mangrum, John B., Ibrahim Zgani, Samantha D. Tsotsoros, Yun Qu, and Nicholas P. Farrell. "Zinc finger peptide cleavage by a dinuclear platinum compound." Chemical Communications 49, no. 62 (2013): 6986. http://dx.doi.org/10.1039/c3cc44219e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

NEMYKIN, VICTOR N., VLADISLAV M. MYTSYK, SERGEY V. VOLKOV, and NAGAO KOBAYASHI. "Synthesis and spectroscopic properties of new phthalocyanine complexes with potentially combined photodynamic activity and cytotoxicity for photodynamic therapy." Journal of Porphyrins and Phthalocyanines 04, no. 05 (August 2000): 551–54. http://dx.doi.org/10.1002/1099-1409(200008)4:5<551::aid-jpp270>3.0.co;2-l.

Full text

Abstract:

The reaction of zinc tetrakis(3-pyridyloxy)phthalocyanine (1) with NH 4[ PtNH 3 Cl 3] leads to zinc tetrakis(cis-[3-oxypyridyl]-N]amminedichloroplatinum(II))phthalocyanine (2), while the reaction of 1 with cis- Pt ( DMSO )2 Cl 2 or 2 with DMSO forms zinc tetrakis(cis-[(3-oxypyridyl)-N]dichloro[sulfinylbis(methane)-S]platinum (II))phthalocyanine (3). The new phthalocyanines 2 and 3, with potentially combined photodynamic activity and cytotoxicity, have been characterized by means of electronic, 1 H NMR and IR spectroscopies.

APA, Harvard, Vancouver, ISO, and other styles

22

Akiyoshi, Ryohei, Yuma Hirota, Daisuke Kosumi, Ryo Ohtani, Masaaki Nakamura, Leonard F. Lindoy, and Shinya Hayami. "Ferroelectric and luminescence properties of zinc(ii) and platinum(ii) soft complexes." Dalton Transactions 47, no. 40 (2018): 14288–92. http://dx.doi.org/10.1039/c8dt01100a.

Full text

Abstract:

Zinc(ii) and platinum(ii) complexes [M(X-4-C₁₈-salmmen)] (M = Zn (1) and Pt (2), X = R, S (optical isomer) and rac (racemate), salmmen = N,N′-monomethylenebis-salicylideneimine) were synthesized and investigated.

APA, Harvard, Vancouver, ISO, and other styles

23

Clark, Emily R., and Donald M. Kurtz. "Photosensitized H2 generation from “one-pot” and “two-pot” assemblies of a zinc-porphyrin/platinum nanoparticle/protein scaffold." Dalton Transactions 45, no. 2 (2016): 630–38. http://dx.doi.org/10.1039/c5dt03418c.

Full text

Abstract:

Photosensitized H₂ generation can be sustained for several hours in aqueous solution using a protein scaffold that nucleates formation of platinum nanoparticles (Pt NPs) and contains “built-in” zinc-porphyrin photosensitizers.

APA, Harvard, Vancouver, ISO, and other styles

24

Dillon, CT, and BJ Kennedy. "The Electrochemically Formed Palladium-Deuterium System. I. Surface Composition and Morphology." Australian Journal of Chemistry 46, no. 5 (1993): 663. http://dx.doi.org/10.1071/ch9930663.

Full text

Abstract:

Surface analysis of palladium cathodes after prolonged electrolysis in D2O electrolytes shows evidence for the electrodeposition of Pt, Zn and Cu. The platinum comes from the platinum anode used in the work, whilst zinc and copper are present in the D2O. Scanning electron microscopy studies of cast palladium cathodes revealed a diverse surface topology with no single feature present. The effect of electrode pretreatment on the appearance of the microcrystallites is discussed, and evidence for a palladized overlay is presented.

APA, Harvard, Vancouver, ISO, and other styles

25

Kuz'mina, A. S., M. Yu Kuzmina, and M. P. Kuz'min. "Morphology of ZnO Films Fabricated by Electrochemical Oxidation of Metallic Zn." Materials Science Forum 989 (May 2020): 210–14. http://dx.doi.org/10.4028/www.scientific.net/msf.989.210.

Full text

Abstract:

Anodic oxide films of zinc oxide in an aqueous solution of K Cl (0.1 M; 0.5 M and 1 M) were obtained by electrochemical oxidation of zinc metal. Zinc electrode was used as anode and platinum plate as cathode. The study discusses the influence of the concentrations of K Cl solution and the voltage applied to the electrochemical cell on the morphology of the obtained anode films, as well as their thermodynamic stability. The analysis of volt-ampere curves of linear potential sweep and chronoamperometric dependences showed that oxidation in 0.1 M K Cl solution at a voltage of 7.5 V allows to obtain continuous stable defect-free Zn O films on metal zinc.

APA, Harvard, Vancouver, ISO, and other styles

26

Bulgakov, Roman A., Nina A. Kuznetsova, Olga V. Dolotova, Ludmila I. Solovieva, John Mack, Wadzanai J. U. Chidawanyika, Oleg L. Kaliya, and Tebello Nyokong. "Synthesis and photophysical properties of covalent conjugates of aqua platinum(II) and octacarboxy-substituted zinc phthalocyanine." Journal of Porphyrins and Phthalocyanines 16, no. 11 (October 22, 2012): 1217–24. http://dx.doi.org/10.1142/s1088424612501209.

Full text

Abstract:

New covalent conjugates of aqua platinum(II) and octacarboxy-substituted zinc phthalocyanine, bearing one, two, three and four aqua platinum moieties on the periphery of the Pc ligand have been synthesized and characterized. The effect of the stepwise introduction of the aqua platinums on the photophysical and photochemical properties of these compounds has been investigated in dimethylsulfoxide solution. It has been found that aqua platinum moieties have only a limited effect on the dynamics of the singlet and triplet excited states, on the ability to sensitize singlet oxygen formation and on the photostability. Each conjugate has a high singlet oxygen quantum yield (ΦΔ 0.51–0.62) and thus retains potential for use as a dual action anticancer drugs by acting as a sensitizer for PDT in addition to the likely chemotherapeutic effects of the Pt(II) complexes.

APA, Harvard, Vancouver, ISO, and other styles

27

Stepka, Petr, Monika Kratochvilova, Michaela Kuchynka, Martina Raudenska, Hana Holcova Polanska, Tomas Vicar, Tomas Vaculovic, Marketa Vaculovicova, and Michal Masarik. "Determination of Renal Distribution of Zinc, Copper, Iron, and Platinum in Mouse Kidney Using LA-ICP-MS." BioMed Research International 2021 (October 26, 2021): 1–8. http://dx.doi.org/10.1155/2021/6800294.

Full text

Abstract:

The main dose-limiting side effect of cisplatin is nephrotoxicity. The utilization of cisplatin is an issue of balancing tumour toxicity versus platinum-induced nephrotoxicity. In this study, we focused on intraorgan distribution of common essential trace elements zinc, copper, and iron in healthy mouse kidneys and distribution of platinum after cisplatin treatment. Renal distribution in 12 nontreated Nu-Nu mice (males) was assessed by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Furthermore, 9 Nu-Nu mice were treated with cisplatin. The order of elements concentration in kidneys was as follows: Fe > Zn > Cu. All three metals showed the higher concentrations at the cortex and medulla (28.60, 3.35, and 93.83 μg/g for Zn, Cu, and Fe, respectively) and lower concentration at the pelvis and the urinary tract (20.20, 1.93, and 62.48 μg/g for Zn, Cu, and Fe, respectively). No statistically significant difference between cortex and medulla was observed for these elements. After platinum treatment, the concentration of platinum in kidneys was enhanced more than 60-times, p < 0.001 . Platinum significantly showed the highest accumulation in cortex (2.11 μg/g) with a gradient distribution. Platinum was less accumulated in medulla and pelvis than in cortex, and the lowest accumulation occurred in the urinary tract (1.13 μg/g). Image processing has been successfully utilized to colocalize metal distribution using LA-ICP-MS and histological samples images.

APA, Harvard, Vancouver, ISO, and other styles

28

Baev, Alexander, Oscar Rubio-Pons, Faris Gel'mukhano, and Hans Ågren. "Optical Limiting Properties of Zinc- and Platinum-Based Organometallic Compounds." Journal of Physical Chemistry A 108, no. 36 (September 2004): 7406–16. http://dx.doi.org/10.1021/jp040078s.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Silina, E., J. Ashaks, V. Belsky, A. Stash, L. Pech, and Yu Bankovsky. "Structure of platinum, zinc and cadmium 8-hydroseleno-L-quinolinates." Acta Crystallographica Section A Foundations of Crystallography 58, s1 (August 6, 2002): c135. http://dx.doi.org/10.1107/s0108767302090438.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Aramata, Akiko, Md A. Quaiyyum, Wilfredo A. Balais, Takashi Atoguchi, and Michio Enyo. "UPD of zinc on polycrystalline platinum in various pH solutions." Journal of Electroanalytical Chemistry 338, no. 1-2 (October 1992): 367–72. http://dx.doi.org/10.1016/0022-0728(92)80436-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Vacus, J., G. Memetzidis, P. Doppelt, and J. Simon. "The synthesis of unsymmetrically functionalized platinum and zinc phthalocyanine complexes." Journal of the Chemical Society, Chemical Communications, no. 6 (1994): 697. http://dx.doi.org/10.1039/c39940000697.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Sun, Qiming, Ning Wang, Qiyuan Fan, Lei Zeng, Alvaro Mayoral, Shu Miao, Ruoou Yang, et al. "Subnanometer Bimetallic Platinum–Zinc Clusters in Zeolites for Propane Dehydrogenation." Angewandte Chemie 132, no. 44 (May 11, 2020): 19618–27. http://dx.doi.org/10.1002/ange.202003349.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Sun, Qiming, Ning Wang, Qiyuan Fan, Lei Zeng, Alvaro Mayoral, Shu Miao, Ruoou Yang, et al. "Subnanometer Bimetallic Platinum–Zinc Clusters in Zeolites for Propane Dehydrogenation." Angewandte Chemie International Edition 59, no. 44 (May 11, 2020): 19450–59. http://dx.doi.org/10.1002/anie.202003349.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Chen, Siming, Dechen Xu, Huan Jiang, Zhaoyong Xi, Pingping Zhu, and Yangzhong Liu. "Trans-Platinum/Thiazole Complex Interferes with Sp1 Zinc-Finger Protein." Angewandte Chemie International Edition 51, no. 49 (November 4, 2012): 12258–62. http://dx.doi.org/10.1002/anie.201206596.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Chen, Siming, Dechen Xu, Huan Jiang, Zhaoyong Xi, Pingping Zhu, and Yangzhong Liu. "Trans-Platinum/Thiazole Complex Interferes with Sp1 Zinc-Finger Protein." Angewandte Chemie 124, no. 49 (November 4, 2012): 12424–28. http://dx.doi.org/10.1002/ange.201206596.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Joshi, Leela Pradhan. "Prunus domestica dye extraction for fabrication of zinc oxide based dye-sensitized solar cells." BIBECHANA 13 (December 3, 2015): 23–28. http://dx.doi.org/10.3126/bibechana.v13i0.13341.

Full text

Abstract:

Aluminium doped Zinc Oxide (AZO) seed layers were deposited on Fluorine doped Tin Oxide (FTO) substrates using a spin coating technique. These were then immersed in growth solutions of zinc nitrate, hexamethylenetetramine and distilled water to develop nanoplates of Zinc Oxide (ZnO). The nanostructures of ZnO grown on FTO were studied using x-ray diffraction techniques. Dye-sensitized solar cells (DSSC) were fabricated using two prepared electrodes, one of dye-loaded zinc oxide and another that was platinum coated. The electrolyte used was potassium iodide iodine solution. The performance of the assembled DSCCs was tested by drawing an IV curve. The results showed that the short circuit current and open circuit voltages were about 10 microamperes and 270 millivolts respectively.BIBECHANA 13 (2016) 23-28

APA, Harvard, Vancouver, ISO, and other styles

37

Bakar, M. A., Muhammad Azmi Abd Hamid, and A. Jalar. "Growth Behaviour of ZnO on Si (100) and Platinum Coated Glass Substrate from Aqueous Solution." Advanced Materials Research 97-101 (March 2010): 1550–53. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1550.

Full text

Abstract:

Zinc oxide nanorods were grown on Si (100) and Platinum coated glass substrate by the aqueous chemical growth (ACG) in aqueous solution that contained zinc nitrate hexahydrate (Zn(NO3)2•6H20) and hexamethylenetetramine (C6H12N4). The obtained ZnO nanorods are uniformly distributed on the Platinum coated glass substrate surface from 1.5 h to 3 h growth time. Branched hexagonal rods were also found growth on these uniform nanorods. Branched hexagonal rods were found on Si (100) from 2 h to 3 h growth time. A small number of flower-like structures compared to the majority oval type structure suggest that secondary nucleation had occurred during the process of growth. All of the high intensity peaks, including the strong (101) peak, are assigned to wurtzite ZnO hexagonal indicating that the product is pure ZnO. The results found in this study revealed that the type substrate plays a role in determining the surface morphology of ZnO growth.

APA, Harvard, Vancouver, ISO, and other styles

38

Zhurenok, Angelina V., Dina V. Markovskaya, Evgeny Y. Gerasimov, Alexander S. Vokhmintsev, Ilya A. Weinstein, Igor P. Prosvirin, Svetlana V. Cherepanova, Andrey V. Bukhtiyarov, and Ekaterina A. Kozlova. "Constructing g-C3N4/Cd1−xZnxS-Based Heterostructures for Efficient Hydrogen Production under Visible Light." Catalysts 11, no. 11 (November 6, 2021): 1340. http://dx.doi.org/10.3390/catal11111340.

Full text

Abstract:

Two types of photocatalysts, 1%Pt/Cd1−xZnxS/g-C3N4 (x = 0.2–0.3) and Cd1−xZnxS/1%Pt/g-C3N4 (x = 0.2–0.3), were synthesized by varying the deposition order of platinum, and a solid solution of cadmium and zinc sulfides onto the surface of g-C3N4. The characterization of photocatalysts showed that, for 1%Pt/Cd1−xZnxS/g-C3N4, small platinum particles were deposited onto a solid solution of cadmium and zinc sulfides; in the case of Cd1−xZnxS/1%Pt/g-C3N4, enlarged platinum clusters were located on the surface of graphitic carbon nitride. Based on the structure of the photocatalysts, we assumed that, in the first case, type II heterojunctions and, in the latter case, S-scheme heterojunctions were realized. The activity of the synthesized samples was tested in hydrogen evolution from triethanolamine (TEOA) basic solution under visible light (λ = 450 nm). A remarkable increase in hydrogen evolution rate compared to single-phase platinized 1%Pt/Cd1−xZnxS photocatalysts was observed only in the case of ternary photocatalysts with platinum located on the g-C3N4 surface, Cd1−xZnxS/1%Pt/g-C3N4. Thus, we proved using kinetic experiments and characterization techniques that, for composite photocatalysts based on Cd1−xZnxS and g-C3N4, the formation of the S-scheme mechanism is more favorable than that for type II heterojunction. The highest activity, 2.5 mmol H2 g−1 h−1, with an apparent quantum efficiency equal to 6.0% at a wavelength of 450 nm was achieved by sample 20% Cd0.8Zn0.2S/1% Pt/g-C3N4.

APA, Harvard, Vancouver, ISO, and other styles

39

Yang, Chao-Chen, and Min-Fong Shu. "Electrodeposition of Zinc from Binary ZnCl2-DMSO2 Molten Electrolyte at Room Temperature." Zeitschrift für Naturforschung A 62, no. 12 (December 1, 2007): 754–60. http://dx.doi.org/10.1515/zna-2007-1214.

Full text

Abstract:

The electrochemical behaviour of zinc on copper, platinum, and tungsten working electrodes was investigated in a binary ZnCl2-DMSO2 room temperature molten salt electrolyte in the temperature range of 60 - 80◦C. Various over-potentials, −0.1, −0.2, −0.3, −0.4, and −0.5 V, were chosen as deposition potentials. The nucleation/growth of zinc changed from progressive to instantaneous if the over-potentials increased from low to high level. The surface morphology and crystal structure of the deposited layer were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Moreover, larger grain size and hexagonal close packing of the zinc layer at −0.5 V were observed by transmission electron microscopy (TEM) with electron diffraction mapping.

APA, Harvard, Vancouver, ISO, and other styles

40

Sadyrbaeva, Tatiana. "Membrane Extraction and Electrodeposition of Zinc(II) and Lead(II) during Electrodialysis." Key Engineering Materials 800 (April 2019): 175–80. http://dx.doi.org/10.4028/www.scientific.net/kem.800.175.

Full text

Abstract:

The processes of Zn2+ and Pb2+ extraction by bulk liquid membranes containing di (2-ethylhexyl) phosphoric acid and tri-n-octylamine during galvanostatic electrodialysis accompanied by electrodeposition of the metals were studied. The effects of the current density as well as of composition of the liquid membranes and aqueous solutions on the rate of zinc (II) and lead (II) transport were determined. It was demonstrated that a practically complete removal of zinc (II) and more than 90 % extraction of lead (II) from the feed solutions containing 0.01 M ZnSO4 or 0.01 M Pb (NO3)2 was achieved during 1.0 − 5.0 h of electrodialysis. A possibility of effective transfer of zinc (II) into dilute solutions of sulphuric, hydrochloric, perchloric and acetic acids was shown. Adherent zinc and lead coatings with a fine-grained structure have been deposited on the platinum cathode. More than 75% of zinc (II) and about 60% of lead (II) was deposited from solutions of sulfuric acid and perchloric acid, respectively.

APA, Harvard, Vancouver, ISO, and other styles

41

Su, Xiaojie, Shehua Yang, Yuxia Song, Jing Li, Lixiao Wei, and Jing Zhao. "Adsorption of sulfathiazole drug on the platinum-decorated zinc oxide nanotubes." Journal of Sulfur Chemistry 41, no. 6 (July 27, 2020): 645–56. http://dx.doi.org/10.1080/17415993.2020.1797032.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Mandapaka, Ravikiran, and Giridhar Madras. "Zinc and platinum co-doped ceria for WGS and CO oxidation." Applied Catalysis B: Environmental 211 (August 2017): 137–47. http://dx.doi.org/10.1016/j.apcatb.2017.04.044.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Masai, Hirokazu, Toshiro Tanimoto, Takumi Fujiwara, Syuji Matsumoto, Yoshihiro Takahashi, Yomei Tokuda, and Toshinobu Yoko. "Fabrication of Sn-doped zinc phosphate glass using a platinum crucible." Journal of Non-Crystalline Solids 358, no. 2 (January 2012): 265–69. http://dx.doi.org/10.1016/j.jnoncrysol.2011.09.025.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Artyukh, Tatyana, Inna Hryhorenko, Alla Ternova, Svitlana Yaheliuk, Oleksii Verenikin, and Mihai Cernavca. "Identification of white jewelry alloy based on silver and platinum for testing purposes." Eastern-European Journal of Enterprise Technologies 5, no. 12(113) (October 31, 2021): 47–59. http://dx.doi.org/10.15587/1729-4061.2021.243179.

Full text

Abstract:

The procedure for the identification of white jewelry alloys based on precious metals, in particular, silver, platinum and platinum group metals with different contents of alloying components, by testing on an assay stone and by the method of X-ray fluorescence analysis has been considered. The methodology for assessing the compliance of silver and platinum fineness in white jewelry alloys of different component composition with the requirements of regulatory documents and the procedure for their identification has been improved. It has been established that the silver fineness in precious alloys of the AgCu, AgZnCu system, determined using the potassium dichromate reagent on the test stone, depends on the manifestation of the contrast of the qualitative reaction from the standard sample (assay needle). It has been proven that for testing silver alloys containing palladium, the "Acid reagent for gold 750" is effective, which works to determine the qualitative and approximate content of silver in alloys. It was determined that the reagent "Ferrous-cyanide potassium" is very sensitive to changes in the alloy composition of silver alloys and makes it possible to establish the silver content with an accuracy of 5 %. The presence in silver alloys of such impurities as zinc, cadmium, nickel, gold, palladium and others increases the error in determining the fineness of silver and forms a different color and shade. It has been proven that testing of silver alloys on an assay stone with silver nitrate is effective only for the СрМ system. The presence of zinc in 925 sterling silver alloys visually increases the color intensity of the sediment, which indicates a higher overestimated fineness. It has been found that the identification of the content of precious alloys based on platinum for the presence of ligature components is carried out with a potassium iodide reagent at t=120 °C by the color and shade of the sediment. The procedure for using potassium iodide during testing of precious platinum-based alloys has been optimized

APA, Harvard, Vancouver, ISO, and other styles

45

Bulgakov, Roman A., Nina A. Kuznetsova, Olga V. Dolotova, Ekaterina N. Shevchenko, Anna D. Plyutinskay, Oleg L. Kaliya, and Tebello Nyokong. "Covalent Conjugates of Ammine and Diamine Platinum(II) with Zinc(II) Octacarboxyphthalocyanine." Macroheterocycles 5, no. 4-5 (2012): 350–57. http://dx.doi.org/10.6060/mhc2012.121192k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Aguilar-Ríos, G., M. A. Valenzuela, H. Armendariz, P. Salas, J. M. Domínguez, D. R. Acosta, and I. Schifter. "Metal-support effects and catalytic properties of platinum supported on zinc aluminate." Applied Catalysis A: General 90, no. 1 (October 1992): 25–34. http://dx.doi.org/10.1016/0926-860x(92)80245-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Fukase, Satoshi, Hideaki Kumagai, and Teruo Suzuka. "Catalytic behavior of platinum ion-exchanged zinc-aluminosilicates in n-pentane aromatization." Applied Catalysis A: General 93, no. 1 (December 1992): 35–45. http://dx.doi.org/10.1016/0926-860x(92)80292-k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Aramata, Akiko, Satoru Terui, Satoshi Taguchi, Toshikazu Kawaguchi, and Katsuaki Shimazu. "Underpotential deposition of zinc ions on polycrystalline platinum: FTIR and EQCM study." Electrochimica Acta 41, no. 5 (April 1996): 761–66. http://dx.doi.org/10.1016/0013-4686(95)00364-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Dorda, Andreas A., Frank R. McLarnon, and Elton J. Cairns. "The effect of zinc ions on the platinum electrode in alkaline solutions." Journal of Electroanalytical Chemistry 364, no. 1-2 (January 1994): 71–77. http://dx.doi.org/10.1016/0022-0728(93)02908-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Arroyo-Ramírez, Lisandra, Chen Chen, Matteo Cargnello, Christopher B. Murray, Paolo Fornasiero, and Raymond J. Gorte. "Supported platinum–zinc oxide core–shell nanoparticle catalysts for methanol steam reforming." J. Mater. Chem. A 2, no. 45 (2014): 19509–14. http://dx.doi.org/10.1039/c4ta04790g.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Platinum-zinc'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles