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Systematic study of Nd^(3+) on structural properties of ZnO nanocomposite for biomedical applications; in-vitro biocompatibility,bioactivity, photoluminescence and antioxidant properties

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Journal of Rare Earths 2019年第5期37卷 508-514页

作者： Saeed Jafarirad maryam Salmasi Baharak Divband Mohammadhassan Sarabchi Research Institute for Fundamental Sciences (RIFS) University of Tabriz Research Center for Pharmaceutical Nanotechnology Tabriz University of Medical Sciences Inorganic Chemistry Department Faculty of Chemistry University of Tabriz

Owing to the inconformity in ionic radius between Nd^(3+) and Zn^(2+), the successful incorporation of Nd^(3+) ion into the ZnO nanocrystals still remains a great challenge. In the present study various doping ratios containing 1 wt%, 5 wt%, 7 wt% and 10 wt% of Nd^(3+) doped ZnO nanoparticles(Nd/ZnO NPs) were synthesized in which a bio-layer caped the NPs. SEM/EDX analysis was performed on the ZnO and Nd/ZnO NPs. In addition, the as-synthesized NPs were characterized using X-ray diffraction(XRD), dynamic light scattering(DLS), differential reflectance spectroscopy(DRS) and photoluminescence(PL) *** average size of Nd(5 wt%)/ZnO NPs was in the range of 6.22 and 15 e18 nm based on XRD and SEM techniques, respectively. The measured band gap values for pure ZnO and Nd/ZnO NCs with doping ratios of 1 wt%, 5 wt%, 7 wt% and 9 wt% were equal to 3.46, 3.26, 3.05, 3.25 and 3.29, respectively. After inhalation, nanoparticles first interact with lung surfactant system and accordingly their toxic effects will appear on lungs cells such as A549 cell line. The effect of Nd/ZnO NPs to interact by human A549 cell line was evaluated by means of cell viability test. According to cell viability test the concentrations of 0.3 and 0.5 mg/mL of Nd/ZnO NPs induce a low toxicity. The present study shows that these toxic effects of Nd/ZnO NPs can be rectified by capping its surface via the addition of a bio-layer around particles in order to prevent them from interacting A549 cell line.

关键词： Neodymium Rare earth elements Cell viability test Nanostructures

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Pediatric palliative care for children with cancer:a concept analysis using Rodgers’evolutionary approach

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World Journal of Pediatrics 2022年第12期18卷 791-803页

作者： Parvaneh Vasli maryam Karami Hanieh AsadiParvar-Masouleh Department of Community Health Nursing School of Nursing and MidwiferyShahid Beheshti University of Medical SciencesVali Asr Ave.Ayatollah Hashemi Rafsanjani Cross RoadTehranIran School of Nursing&Midwifery Shahid Beheshti University of Medical SciencesTehranIran Faculty of Literature and Human Sciences Shahid Beheshti UniversityTehranIran

Background Providing access to pediatric palliative care(PPC)for children living with a serious illness,such as cancer,is of critical importance,although this specialized intervention,as a novel concept,still seems vague and *** present study analyzed the concept of PPC for children with *** Rodgers'evolutionary method was employed for the concept *** on PPC,particularly those for children suffering from cancer,published between 2010 and 2021 were searched in valid academic research *** inclusion criteria for the full-text articles were based on the characteristics,antecedents,and consequences of PPC for children with *** In total,19 relevant articles were selected and then reviewed and analyzed after applying the inclusion criteria and the final *** analysis of the concept of PPC for children affected with cancer revealed four characteristics,including"PPC as holistic and integrated care","PPC as patient-and family-centered care","PPC as early-start continuous care",and"PPC as interdisciplinary and team-based care".Some effective factors could also act as antecedents for this concept,i.e.,health care providers'training and expertise as well as human resources and ***,improved quality of life,symptom reduction,and coordination between patient care and family support were among the PPC consequences for such *** The study results demonstrated that delivering PPC to children with cancer demanded a comprehensive view of its various ***,numerous factors need to be delineated for its accurate and complete implementation.

关键词： Cancer Children Palliative care Survivor

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Prevalence of shiga toxins(stx_1,stx_2),eaeA and hly genes of Escherichia coli O157:H7 strains among children with acute gastroenteritis in southern of Iran

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Asian Pacific Journal of Tropical Medicine 2015年第1期8卷 24-28页

作者： Mohammad Kargar maryam Homayoon Department of Microbiology Islamic Azad University Young Reseasrchers and Elite Club Marvdasht BranchIslamic Azad University

Objective:To survey the prevalence severe diarrhea arising from these bacteria in children under 5 years old in ***:In this study faecal sample from 615 children aged <5years old who were hospitalized lor gastroenteritis in Fars hospitals in Iran were collected and then enriched in Escherichia coli(***) broth and modified tryplone soy broth with novobiocin media,fermentation of sorbitol,lactose and β— glucoronidase activity of isolated strains was examined by CT—SMAC,VRBA and chromogenic media *** isolation of *** O157:H7 have been confirmed with the use of specific antisera and with multiplex PCR method presence of virulence genes including:xtx_***_2,*** has been ***:*** O157:H7 was detected in 7(1.14%) stool specimens.A significanl difference was seen between detection rale of isolated bacteria from age groups 18-23 months and other age groups(P=0.004).Out of considered virulence *** 1 of the isolated strains(0.16%)he stx,and eaeA genes were seen and also all isolated hacleria had resistance to penicillin,ampicillin and erythromycin ***:We found thai children < 2 years of age were at highest risk of infection with *** O157:*** severity of *** O157:H7 pathogenesis,low infectious dose and lack of routine assay for detection ol these bacleria in clinical laboratory,further and completed studies on diagnosis and genolyping of this *** O157:H7 strain has been recommended.

关键词： Escherichia coli O157:H7 Acute gastroenteritis Virulence genes Multiplex PCR

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Directional mechanical and thermal properties of single-layer black phosphorus by classical molecular dynamics

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Chinese Physics B 2018年第1期27卷 535-540页

作者： Afira maryam Ghulam Abbas Muhammad Rashid Atif Sattar Department of Physics Riphah International University Department of Nanoscience and Nanotechnology Research Institute of Physics and Chemistry Chonbuk National University Department of Physics COMSATS Institute of Information Technology Department of Physics Simulation Laboratory The Islamia University of Bahawalpur

Black phosphorus （BP） has received attention due to its own higher carrier mobility and layer dependent electronic properties, such as direct band gap. Interestingly, the single layer black phosphorus （SLBP） has had large popularity in applications related to thermoelectric, optoelectronic, and electronic devices. Here, we investigate the phonon spectrum, thermal conductivities, and stress strain effects. Robust anisotropy was mainly observed in the thermal conductivities together with the alongside zigzag （ZZ） direction value, compared to the armchair （AC） directions. We also investigated the attitude of stress that was anisotropic in both directions, and the stress effects were two times greater across the ZZ path than those in the AC direction at a low temperature. We obtained a ~oung＇s modulus of 63.77 and 20.74 GPa in the AC and ZZ directions, respectively, for a strain range of 0.01. These results had good agreement with first principle calculations. Our study here is useful and significant for the thermal tuning of phosphorus-based nanoelectronics and thermalelectric applications of phosphorus.

关键词： electric and thermal conductivity molecular dynamics methods carbon/carbon-based materials

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Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO_(2) capture sorbents

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Frontiers of Chemical Science and Engineering 2022年第10期16卷 1460-1475页

作者： Mahsa Javidi Nobarzad maryam Tahmasebpoor Mohammad Heidari Covadonga Pevida Faculty of Chemical&Petroleum Engineering University of TabrizTabriz 51666-16471Iran Instituto de Ciencia y Tecnología del Carbono INCAR-CSICOviedo 33011Spain

Carbon nanotubes-based materials have been identified as promising sorbents for efficient CO_(2)capture in fluidized beds,suffering from insufficient contact with CO_(2)for the high-level CO_(2)capture *** study focuses on promoting the fluidizability of hard-to-fluidize pure and synthesized silica-coated amine-functionalized carbon *** novel synthesized sorbent presents a superior sorption capacity of about 25 times higher than pure carbon nanotubes during 5 consecutive adsorption/regeneration *** low-cost fluidizable-SiO_(2)nanoparticles are used as assistant material to improve the fluidity of carbon nanotubes-based *** reveal that a minimum amount of 7.5 and 5 wt%SiO_(2)nanoparticles are required to achieve an agglomerate particulate fluidization behavior for pure and synthesized carbon nanotubes,*** carbon nanotubes+7.5 wt%SiO_(2)and synthesized carbon nanotubes+5 wt%SiO_(2)indicates an agglomerate particulate fluidization characteristic,including the high-level bed expansion ratio,low minimum fluidization velocity(1.5 and 1.6 cm·s^(–1)),high Richardson−Zaki n index(5.2 and 5.3>5),and lowΠvalue(83.2 and 84.8<100,respectively).Chemical modification of carbon nanotubes causes not only enhanced CO_(2)uptake capacity but also decreases the required amount of silica additive to reach a homogeneous fluidization behavior for synthesized carbon nanotubes sorbent.

关键词： CO_(2) capture CNT-based sorbents fluidization SiO_(2) nanoparticles fluidized bed reactors

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Conversion of carbon dioxide to valuable petrochemicals:An approach to clean development mechanism

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Journal of Natural Gas Chemistry 2011年第3期20卷 219-231页

作者： Farnaz Tahriri Zangeneh Saeed Sahebdelfar maryam Takht Ravanchi Catalyst Research Group Petrochemical Research and Technology Company (NPC-RT) National Petrochemical Company

The increase of atmospheric carbon dioxide and the global warming due to its greenhouse effect resulted in worldwide concerns. On the other hand, carbon dioxide might be considered as a valuable and renewable carbon source. One approach to reduce carbon dioxide emissions could be its capture and recycle via transformation into chemicals using the technologies in C1 chemistry. Despite its great interest, there are difficulties in CO2 separation on the one hand, and thermodynamic stability of carbon dioxide molecule rendering its chemical activity low on the other hand. Carbon dioxide has been already used in petrochemical industries for production of limited chemicals such as urea. The utilization of carbon dioxide does not necessarily involve development of new processes, and in certain processes such as methanol synthesis and methane steam reforming, addition of CO2 into the feed results in its utilization and increases carbon efficiency. In other cases, modifications in catalyst and/or processes, or even new catalysts and processes, are necessary. In either case, catalysis plays a crucial role in carbon dioxide conversion and effective catalysts are required for commercial realization of the related processes. Technologies for CO2 utilization are emerging after many years of research and development efforts.

关键词： carbon dioxide utilization C1 chemistry clean development mechanism catalysis greenhouse effects

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Tailoring particle shape for enhancing the homogeneity of powder mixtures:Experimental study and DEM modelling

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Particuology 2021年第1期19卷 58-68页

作者： maryam Asachi Mohammadreza Alizadeh Behjani Ehsan Nourafkan Ali Hassanpour School of Chemical and Process Engineering University of LeedsLeeds LS29JTUK School of Maths and Physics University of LincolnBrayford PoolLincolnLN67TSUK

The effect of particle shape modification on the segregation reduction of enzyme granules in laundry detergent powder mixtures was investigated,both experimentally and computationally using Deseret Element Method(DEM).The shape of modified enzyme particles was in such a way that the large and dense enzyme particles were layered by other fine particles in the detergent powder,by means of a process known in the literature as“seeded granulation”.It is found that the homogeneity of modified enzyme particles could be improved significantly comparing to the original spherical enzyme particles in powder ***,the results of this research demonstrated that the segregation-induced properties of the dense/spherical enzyme particles could be lowered by altering their shape,which could enable the enzyme particles to behave almost similar to other ingredients during the pile formation process.

关键词： Segregation minimisation Particle shape modification Seeded granulation Near-infrared spectroscopy Laundry detergent powders Discrete Element Method

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Nanomagnetic Organogel Based on Dodecyl Methacrylate for Absorption and Removal of Organic Solvents

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Chinese Journal of Polymer Science 2019年第5期37卷 444-450页

作者： Hossein Ghasemzadeh maryam Dargahi Ghazaleh Eyvazi Bahman Vasheghani Farahani Department of Chemistry Faculty of ScienceImam Khomeini International University

A novel nanomagnetic organogel was synthesized by in situ emulsion polymerization-crosslinking method using dodecyl methacrylate(DDMA) and styrene(St) as monomers, divinylbenzene(DVB) as a crosslinking agent, azobisisobutyronitrile(AIBN) as an initiator, and Fe_3O_4 as a nanomagnetic particle. Modification of the network was carried out by inclusion of the multi-walled carbon nanotubes(MWCNT) into the organogel matrix. The structure of the nanocomposite was characterized using FTIR spectroscopy, SEM,TEM, TGA/DTG, VSM, and BET analysis. The effects of various parameters such as the amount of crosslinker, initiator, Fe_3O_4, and reaction time as well as monomer ratio on the oil absorption of the organogel were studied. The synthesized organogel can absorb about35.5, 22.1, 29.86, 14.58, 17.6, 15.3, and 13.7 g·g^(-1) of CHCl_3, toluene, CH_2Cl_2, hexane, crude oil, gasoline, and diesel oil, under the optimized polymerization conditions, respectively. The nanocomposite organogels can be easily separated by a magnetic field after absorption of organic solvents.

关键词： Nanomagnetic organogel Dodecyl methacrylate Styrene Crosslinking MWCNT

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Enhanced electrocatalytic activity of iron amino porphyrins using a flow cell for reduction of CO_(2) to CO

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Journal of Energy Chemistry 2021年第7期30卷 162-169页

作者： maryam Abdinejad Caitlin Dao Xiao-An Zhang Heinz Bernhard Kraatz Department of Physical and Environmental Sciences University of Toronto Scarborough1265 Military TrailTorontoON M1C 1A4Canada Department of Chemistry University of Toronto80 St.George StreetTorontoON M5S 3H6Canada

The flexibility of molecular catalysts is highly coveted for the electrochemical reduction of carbon dioxide(CO_(2)) to carbon monoxide(CO) in both homogeneous and heterogeneous *** the electrocatalytic activity of molecular catalysts has been widely studied in H-cells;their less studied capabilities in more efficient flow cell reactors have the potential to rival that of heterogeneous *** this work,a comparative study of amino functionalized iron-tetraphenylporphyrins(amino-Fe-TPPs) immobilized onto carbonaceous materials in both H-cells and flow cells was conducted to selectively reduce CO_(2) to *** a flow cell set up operating in alkaline media,the resulting hybrid catalyst exhibits 87% faradaic efficiency(FE) with extraordinary current density(j) of 119 mA/cm^(2) and turnover frequency(TOF) of 14 s^(-1) at-1.0 V *** remarkable catalytic activity was achieved through thoughtful combination of molecular and flow cell design that provides an effective strategy for future immobilized heterogeneous approaches toward CO_(2) reduction reactions(CO_(2) RRs).

关键词： Carbon dioxide reduction Carbon dioxide capture Heterogeneous electrocatalysis Iron porphyrin Amino porphyrins CO_(2)RR and flow cell

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Stabilization of a class of nonlinear discrete time systems with time varying delay

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Journal of Central South University 2014年第10期21卷 3769-3776页

作者： maryam Fattahi Nastaran Vasegh Hamid Reza Momeni Faculty of Electrical and Computer Engineering Tarbiat Modares University Faculty of Electrical and Computer Engineering Shahid Rajaee Teacher Tehran Iran

The stability and stabilization of a class of nonlinear discrete time delayed systems(NDTDS) with time-varying delay and norm-bounded nonlinearity are investigated. Based on discrete time Lyapunov–Krasovskii functional method, a sufficient delaydependent condition for asymptotic stability of nonlinear systems is offered. Then, this condition is used to design a new efficient delayed state feedback controller(DSFC) for stabilization of such systems. These conditions are in the linear matrix inequality(LMI) framework. Illustrative examples confirm the improvement of the proposed approach over the similar cases. Furthermore, the obtained stability and stabilization conditions will be extended to uncertain discrete time delayed systems(UDTDS) with polytopic parameter uncertainties and also with norm-bounded parameter uncertainties.

关键词： nonlinear discrete time delayed systems Lyapunov–Krasovskii functional delayed state feedback linear matrix inequality(LMI) polytopic parameter uncertainties norm bounded parameter uncertainties

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