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https://www.readbyqxmd.com/read/29775278/hybrid-nanomaterials-with-single-site-catalysts-by-spatially-controllable-immobilization-of-nickel-complexes-via-photoclick-chemistry-for-alkene-epoxidation
#1
Dwaipayan Ghosh, Benny Febriansyah, Disha Gupta, Leonard Kia-Sheun Ng, Shibo Xi, Yonghua Du, Tom Baikie, ZhiLi Dong, Han Sen Soo
Catalyst deactivation is a persistent problem not only for the scientific community but also in industry. Isolated single-site heterogeneous catalysts have shown great promise to overcome these problems. Here, a versatile anchoring strategy for molecular complex immobilization on a broad range of semiconducting or insulating metal oxide (e.g. titanium dioxide, mesoporous silica, cerium oxide, and tungsten oxide) nanoparticles to synthesize isolated single-site catalysts has been studied systematically. An oxidatively stable anchoring group, maleimide, is shown to form covalent linkages with surface hydroxyl functionalities of metal oxide nanoparticles by photoclick chemistry...
May 18, 2018: ACS Nano
https://www.readbyqxmd.com/read/29771967/photocatalytic-degradation-of-dimethoate-in-bok-choy-using-cerium-doped-nano-titanium-dioxide
#2
Xiangying Liu, Yu Li, Xuguo Zhou, Kun Luo, Lifeng Hu, Kailin Liu, Lianyang Bai
Dimethoate, a systemic insecticide, has been used extensively in vegetable production. Insecticide residues in treated vegetables, however, pose a potential risk to consumers. Photocatalytic degradation is a new alternative to managing pesticide residues. In this study, the degradation of dimethoate in Bok choy was investigated under the field conditions using cerium-doped nano titanium dioxide (TiO2/Ce) hydrosol as a photocatalyst. The results show that TiO2/Ce hydrosol can accelerate the degradation of dimethoate in Bok choy...
2018: PloS One
https://www.readbyqxmd.com/read/29770828/ozone-mediated-synthesis-of-ceria-nanoparticles
#3
Anuja Bhalkikar, Tai-Sing Wu, Chris M Marin, Tamra J Fisher, Meiyu Wang, Isaac H Wells, Anandakumar Sarella, Yun-Liang Soo, Chin Li Cheung
We report a rapid, room temperature methodology to synthesize fluorite-structured ceria nanoparticles using cerium(iii) salts and ozone in the presence of short chain primary, secondary, and tertiary alcohols. This simple technique produced nanoparticles with higher oxygen vacancy compared to that of bulk ceria.
May 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29768825/role-of-copper-and-cerium-on-core-shell-al-mcm-41-in-no-reduction-via-a-scr-ch%C3%A2
#4
Tanasan Intana, Karin Föttinger, Günther Rupprechter, Paisan Kongkachuichay
Copper species in the structure of Cu/core-shell Al-MCM-41 catalysts prepared by different techniques of Cu loading-substitution (S), ion-exchange (E), and impregnation (I) methods-were tested for NO reduction via a selective catalytic reaction with methane. Cerium was added to enhance the performance of copper. It was found that the 1.5%Ce-SEI-Cu/Al-MCM-41, in which Cu was loaded by all three techniques gave the highest NO conversion of 85% at 500 °C. Based on the results from FT-IR in-situ experiment, the mechanism of SCR-CH4 reaction is proposed...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29763827/site-preference-for-luminescent-activator-ions-in-doped-fluoroperovskite-rbznf-3
#5
Sanjay Kumar Saroj, Rajamani Nagarajan
With the dual objective of investigating the site preferences of larger sized activator ions and to append luminescence property to the perovskite structured RbZnF3 , doping of manganese(II), cerium(III), europium(III) and terbium(III) ions (5 mol%) was carried out. Although cubic symmetry of RbZnF3 was preserved for all the doped samples, site preference of rare-earth ions for the A-site Rb+ leading to an inverse perovskite arrangement has been noticed from careful analysis of lattice parameters from refinement of powder X-ray diffraction data...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29761696/emergence-of-kondo-resonance-in-graphene-intercalated-with-cerium
#6
Jinwoong Hwang, Kyoo Kim, Hyejin Ryu, Jingul Kim, Ji-Eun Lee, Sooran Kim, Minhee Kang, Byeong-Gyu Park, Alessandra Lanzara, Jinwook Chung, Sung-Kwan Mo, Jonathan Denlinger, Byung Il Min, Choongyu Hwang
The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid and its relation to magnetism. Kondo effect, the formation of a new resonant ground state with quenched magnetic moment, provides a general framework to describe many-body interaction in the presence of magnetic impurity. In this Letter, a combined study of angle-resolved photoemission (ARPES) and dynamic mean-field theory (DMFT) on Ce-intercalated graphene shows that Ce-induced localized states near Fermi energy, EF , hybridized with the graphene π band, exhibit gradual increase in spectral weight upon decreasing temperature...
May 15, 2018: Nano Letters
https://www.readbyqxmd.com/read/29752862/nanoceria-loaded-injectable-hydrogels-for-potential-age-related-macular-degeneration-treatment
#7
Kai Wang, Rajendra Narayan Mitra, Min Zheng, Zongchao Han
The major purpose of this article is to evaluate oligochitosan coated cerium oxide nanoparticles (OCCNPs) alginate laden injectable hydrogels and their potential treatment for age-related macular degeneration (AMD). The water soluble OCCNPs were loaded within injectable hydrogels as antioxidative agents. The release of OCCNPs from hydrogel, radical scavenging properties, and biocompatibility were evaluated and calculated in vitro. The effects of OCCNP laden hydrogel downregulating expression of angiogenic proteins and pro-inflammatory cytokines were quantified in human retinal pigment epithlium-19 (ARPE-19) and umbilical endothelium cell lines...
May 12, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29750034/physiologically-based-pharmacokinetic-modeling-of-nanoceria-systemic-distribution-in-rats-suggests-dose-and-route-dependent-biokinetics
#8
Ulrika Carlander, Tshepo Paulsen Moto, Anteneh Assefa Desalegn, Robert A Yokel, Gunnar Johanson
Background: Cerium dioxide nanoparticles (nanoceria) are increasingly being used in a variety of products as catalysts, coatings, and polishing agents. Furthermore, their antioxidant properties make nanoceria potential candidates for biomedical applications. To predict and avoid toxicity, information about their biokinetics is essential. A useful tool to explore such associations between exposure and internal target dose is physiologically based pharmacokinetic (PBPK) modeling. The aim of this study was to test the appropriateness of our previously published PBPK model developed for intravenous (IV) administration when applied to various sizes of nanoceria and to exposure routes relevant for humans...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29749422/cerium-oxide-immobilized-reduced-graphene-oxide-hybrids-with-excellent-microwave-absorbing-performance
#9
Zhongqi Wang, Pengfei Zhao, Dongning He, Yuan Cheng, Lusheng Liao, Sidong Li, Yongyue Luo, Zheng Peng, Puwang Li
Microwave absorbing materials with high absorption over a broad bandwidth when they have a small thickness are strongly desired due to their widespread applications. Herein, cerium oxide immobilized reduced graphene oxide (CeO2-rGO) hybrids with excellent microwave absorbing performance have been fabricated by a versatile one-step hydrothermal approach. Modern measurement techniques, including X-ray diffraction, Raman spectroscopy, electronic microscopy, X-ray photoelectron spectroscopy and vector network analysis, have been conducted to characterize the chemical composition, microstructure and electromagnetic performance of the as-obtained hybrids...
May 11, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29748929/toxicological-aspect-of-some-selected-medicinal-plant-samples-collected-from-djelfa-algeria-region
#10
Samir Begaa, Mohammed Messaoudi
Instrumental neutron activation analysis (INAA) has been used to determine the concentration of some toxic chemical elements in a variety of aromatic plants samples collected from Djelfa region. In the present work, eight medicinal plants were examined, such as Artemisia herba-alba Asso., Artemisia compestris L., Laurus nobilis L., Origanum vulgare L., Mentha spicata L., Rosmarinus officinalis L., Mentha pulegium L., and Pistacia lentiscus L. The levels of toxic elements were compared to their daily total intake; Arsenic was present in all plant species examined, with a concentration ranging from 0...
May 10, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29748465/innovative-formulation-combining-al-zr-and-si-precursors-to-obtain-anticorrosion-hybrid-sol-gel-coating
#11
Clément Genet, Marie-Joëlle Menu, Olivier Gavard, Florence Ansart, Marie Gressier, Robin Montpellaz
The aim of our study is to improve the aluminium alloy corrosion resistance with Organic-Inorganic Hybrid (OIH) sol-gel coating. Coatings are obtained from unusual formulation with precursors mixing: glycidoxypropyltrimethoxysilane (GPTMS), zirconium (IV) propoxide (TPOZ) and aluminium tri-sec-butoxide (ASB). This formulation was characterized and compared with sol formulations GPTMS/TPOZ and GPTMS/ASB. In each formulation, a corrosion inhibitor, cerium (III) nitrate hexahydrate, is employed to improve the corrosion performance...
May 10, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29744458/antioxidative-study-of-cerium-oxide-nanoparticle-functionalised-pcl-gelatin-electrospun-fibers-for-wound-healing-application
#12
Hilal Ahmad Rather, Ria Thakore, Ragini Singh, Dhwani Jhala, Sanjay Singh, Rajesh Vasita
Skin wound healing involves a coordinated cellular response to achieve complete reepithelialisation. Elevated levels of reactive oxygen species (ROS) in the wound environment often pose a hindrance in wound healing resulting in impaired wound healing process. Cerium oxide nanoparticles (CeNPs) have the ability to protect the cells from oxidative damage by actively scavenging the ROS. Furthermore, matrices like nanofibers have also been explored for enhancing wound healing. In the current study CeNP functionalised polycaprolactone (PCL)-gelatin nanofiber (PGNPNF) mesh was fabricated by electrospinning and evaluated for its antioxidative potential...
June 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29740653/spatiotemporal-dynamics-of-minimal-bromate-oscillators-in-an-open-one-side-fed-reactor
#13
István Molnár, Krisztina Kurin-Csörgei, István Szalai
Minimal bromate oscillators represent the simplest version of the oscillatory reactions based on the chemistry of the oxybromine species. Here, we present numerical and experimental evidence of the existence of reaction-diffusion waves in the ferroin catalyzed minimal bromate oscillator. The wave dynamics depend not only on the characteristic chemical timescales but also on those of the diffusive matter exchange which occurs between the reaction-diffusion medium and its environment. We show that the extended reactivity of the ferroin catalyst towards the oxybromine species plays an essential role in the observed phenomena...
May 9, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29738461/characterization-of-nanoparticle-batch-to-batch-variability
#14
Sonja Mülhopt, Silvia Diabaté, Marco Dilger, Christel Adelhelm, Christopher Anderlohr, Thomas Bergfeldt, Johan Gómez de la Torre, Yunhong Jiang, Eugenia Valsami-Jones, Dominique Langevin, Iseult Lynch, Eugene Mahon, Inge Nelissen, Jordi Piella, Victor Puntes, Sikha Ray, Reinhard Schneider, Terry Wilkins, Carsten Weiss, Hanns-Rudolf Paur
A central challenge for the safe design of nanomaterials (NMs) is the inherent variability of NM properties, both as produced and as they interact with and evolve in, their surroundings. This has led to uncertainty in the literature regarding whether the biological and toxicological effects reported for NMs are related to specific NM properties themselves, or rather to the presence of impurities or physical effects such as agglomeration of particles. Thus, there is a strong need for systematic evaluation of the synthesis and processing parameters that lead to potential variability of different NM batches and the reproducible production of commonly utilized NMs...
May 8, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29737171/synthesis-of-kainoids-and-c4-derivatives
#15
Zhenlin Tian, Frederic Menard
A unified stereoselective synthesis of 4-substituted kainoids is reported. Four kainic acid analogs were obtained in 8 to 11 steps with up to 54% overall yields. Starting from trans-4-hydroxy-L-proline, the sequence enables a late-stage modification of C4 substituents with of sp2 nucleophiles. Stereoselective steps include a cerium-promoted nucleophilic addition and a palladium-catalyzed reduction. A 10-step route to acid 21a was also established to enable ready functionalization of the C4 position.
May 8, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29734089/magnetic-luminescent-cerium-doped-gadolinium-aluminum-garnet-nanoparticles-for-simultaneous-imaging-and-photodynamic-therapy-of-cancer-cells
#16
Akhil Jain, Rina Koyani, Carlos Muñoz, Prakhar Sengar, Oscar E Contreras, Patricia Juárez, Gustavo A Hirata
Nanoparticle (NP) and photosensitizer (PS) conjugates capable of X-ray photodynamic therapy (X-PDT) are a research focus due to their potential applications in cancer treatment. Combined with X-PDT, appropriate imaging properties of the nanocomposite will make it suitable for theranostics of deep lying tumors. In this work, we describe the development of magnetic-luminescent Gd2.98 Ce0.02 Al5 O12 nanoparticles (GAG) coated with mesoporous silica (mSiO2 ) and loaded with rose bengal (RB) to yield a nanocomposite GAG@mSiO2 @RB capable of X-PDT...
April 27, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29732511/protective-effects-of-curcuma-longa-against-neurobehavioral-and-neurochemical-damage-caused-by-cerium-chloride-in-mice
#17
Yamina Kadri, Riadh Nciri, Noura Brahmi, Saber Saidi, Abdel Halim Harrath, Saleh Alwasel, Waleed Aldahmash, Abdelfatteh El Feki, Mohamed Salah Allagui
Cerium chloride (CeCl3 ) is considered an environmental pollutant and a potent neurotoxic agent. Medicinal plants have many bioactive compounds that provide protection against damage caused by such pollutants. Curcuma longa is a bioactive compound-rich plant with very important antioxidant properties. To study the preventive and healing effects of Curcuma longa on cerium-damaged mouse brains, we intraperitoneally injected cerium chloride (CeCl3 , 20 mg/kg BW) along with Curcuma longa extract, administrated by gavage (100 mg/kg BW), into mice for 60 days...
May 7, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29730552/infrared-and-raman-spectroscopy-of-three-commercial-vermiculites-doped-with-cerium-dioxide-nanoparticles
#18
Michal Ritz, Marta Valášková
Three commercial vermiculites and these vermiculites doped with cerium dioxide nanoparticles were investigated by infrared and Raman spectroscopy. Infrared spectroscopy in middle infrared region (4000-400 cm-1 ) was supplemented by separation of overlapped spectral bands in the region of stretching vibration of hydroxyl groups. Detailed structural properties of vermiculites were completed based on the Raman spectroscopy in the spectral region between 800 and 100 cm-1 and X-ray diffraction analysis. Raman spectroscopy provided evidence of trioctahedral-dioctahedral vermiculite-mica in original vermiculite and trioctahedral phyllosilicate structures in vermiculites after precipitation procedure of cerium dioxide nanoparticles...
April 28, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29726468/isomorphous-rare-earth-tris-bis-2-6-diisopropylphenyl-phosphate-complexes-and-their-catalytic-properties-in-1-3-diene-polymerization-and-in-the-inhibited-oxidation-of-polydimethylsiloxane
#19
Mikhail E Minyaev, Alexander N Tavtorkin, Sof'ya A Korchagina, Galina N Bondarenko, Andrei V Churakov, Ilya E Nifant'ev
Crystals of mononuclear tris[bis(2,6-diisopropylphenyl) phosphato-κO]pentakis(methanol-κO)lanthanide methanol monosolvates of lanthanum, [La(C24 H34 O4 P)3 (CH3 OH)5 ]·CH3 OH, (1), cerium, [Ce(C24 H34 O4 P)3 (CH3 OH)5 ]·CH3 OH, (2), and neodymium, [Nd(C24 H34 O4 P)3 (CH3 OH)5 ]·CH3 OH, (3), have been obtained by reactions between LnCl3 (H2 O)n (n = 6 or 7) and lithium bis(2,6-diisopropylphenyl) phosphate in a 1:3 molar ratio in methanol media. Compounds (1)-(3) crystallize in the monoclinic P21 /c space group and have isomorphous crystal structures...
May 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/29725117/cerium-oxide-nanoparticles-with-antioxidant-capabilities-and-gadolinium-integration-for-mri-contrast-enhancement
#20
Peter Eriksson, Alexey A Tal, Andreas Skallberg, Caroline Brommesson, Zhangjun Hu, Robert D Boyd, Weine Olovsson, Neal Fairley, Igor A Abrikosov, Xuanjun Zhang, Kajsa Uvdal
The chelating gadolinium-complex is routinely used as magnetic resonance imaging (MRI) -contrast enhancer. However, several safety issues have recently been reported by FDA and PRAC. There is an urgent need for the next generation of safer MRI-contrast enhancers, with improved local contrast and targeting capabilities. Cerium oxide nanoparticles (CeNPs) are designed with fractions of up to 50% gadolinium to utilize the superior MRI-contrast properties of gadolinium. CeNPs are well-tolerated in vivo and have redox properties making them suitable for biomedical applications, for example scavenging purposes on the tissue- and cellular level and during tumor treatment to reduce in vivo inflammatory processes...
May 3, 2018: Scientific Reports
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