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https://www.readbyqxmd.com/read/30090536/biological-behaviors-and-chemical-fates-of-ag-2-se-quantum-dots-in-vivo-the-effect-of-surface-chemistry
#1
Huan Tang, Sheng-Tao Yang, Da-Ming Ke, Yi-Fan Yang, Jia-Hui Liu, Xing Chen, Haifang Wang, Yuanfang Liu
Ag2 Se quantum dots (QDs) are novel fluorescent probes in the second near-infrared window with great imaging quality and biocompatibility. Surface modification is an essential step to disperse Ag2 Se QDs into biological fluids, and endow Ag2 Se QDs with diverse surface chemistry. However, the effect of surface chemistry on the biological behaviors and chemical fates of Ag2 Se QDs has not been studied, which hinders the design of suitable Ag2 Se QDs for biomedical applications. Here, the distribution, degradation, excretion and toxicity of 2-aminoethanethiol and mercaptopropionic acid coated Ag2 Se QDs (denoted as QDs-MEA and QDs-MPA, respectively) were systematically investigated in mice for a 28-day observation period after a single intravenous injection...
September 1, 2017: Toxicology Research
https://www.readbyqxmd.com/read/30080402/new-coordination-polymers-of-copper-i-and-silver-i-with-pyrazine-and-piperazine-a-step-toward-green-chemistry-and-optoelectronic-applications
#2
Ruaa M Almotawa, Ghadah Aljomaih, Daniela Vargas Trujillo, Vladimir N Nesterov, Manal A Rawashdeh-Omary
Five coordination polymers and one hexanuclear cluster have been obtained, and their crystal structures were determined upon reaction of Cu(I) or Ag(I) precursors with pyrazine (Pyz) or piperazine (Ppz). Five complexes are mixed-imine-ligand with anionic-fluorinated pyrazolate [3,5-(CF3 )2 Pz]- ([PzF ]- ) besides Pyz or Ppz, whereas the sixth had the neutral diimine as a single chromophore. Complexes 1-3 are isomers of the same Cu/PzF /Pyz composition with the same or different unit cell stoichiometry, namely, {Cu6 [3,5-(CF3 )2 Pz]6 (Pyz)3 (CH2 Cl2 )}∞ (1·CH2 Cl2 ), {Cu2 [3,5-(CF3 )2 Pz]}2 (Pyz)2 ·toluene}∞ (2·toluene), and {Cu3 [3,5-(CF3 )2 Pz]3 (Pyz)1...
August 6, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30077828/au-cdse-heteroepitaxial-nanorods-an-example-of-metal-nanorods-fully-covered-by-a-semiconductor-shell-with-strong-photo-induced-interfacial-charge-transfer-effects
#3
Suh-Ciuan Lim, Wen-Fu Lo, Po-Yuan Yang, Shu-Chen Lu, Anneli Joplin, Stephan Link, Wei-Shun Chang, Hsing-Yu Tuan
Synthesis of metal@semiconductor heteroepitaxial nanorods fully covered by a semiconductor shell remains challenging due to the large lattice mismatch between the two components. Here, we prepared Au@CdSe heteroepitaxial nanorods by employing pre-growth of Ag2 Se as an intermediate layer that favored the formation of a complete CdSe shell via a cation-exchange process. The optical properties of these hybrid nanostructures can be tailored by changing the shell thickness with thicker shells resulting in a redshift of the longitudinal surface plasmon resonance...
July 20, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30061083/long-term-effects-of-three-different-silver-sulfide-nanomaterials-silver-nitrate-and-bulk-silver-sulfide-on-soil-microorganisms-and-plants
#4
Karsten Schlich, Martin Hoppe, Marco Kraas, Jonas Schubert, Munish Chanana, Kerstin Hund-Rinke
Silver nanomaterials (AgNMs) are released into sewers and consequently find their way to sewage treatment plants (STPs). The AgNMs are transformed en route, mainly into silver sulfide (Ag2 S), which is only sparingly soluble in water and therefore potentially less harmful than the original AgNMs. Here we investigated the toxicity and fate of different sulfidized AgNMs using an exposure scenario involving the application of five different test materials (NM-300K, AgNO3 , Ag2 S NM-300K, Ag2 S NM and bulk Ag2 S) into a simulated STP for 10 days...
July 24, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30059924/nanometer-mixed-valence-silver-oxide-enhancing-adsorption-of-zif-8-for-removal-of-iodide-in-solution
#5
Jiuyu Chen, Qianhong Gao, Xiaomei Zhang, Ying Liu, Peng Wang, Yan Jiao, Yi Yang
Nano mixed-valence silver oxide (Ag2 O-Ag2 O3 ) modified the zeolitic imidazolate framework-8 (ZIF-8) composite (Ag2 O-Ag2 O3 @ZIF-8) was firstly prepared via a simple and efficient method, characterized and applied for iodide ion (I- ) uptake from simulated radioactive wastewater. The results showed that Ag2 O-Ag2 O3 nanoparticles doped and uniformly dispersed on the surface of ZIF-8 matrix. The adsorption capacity of the as-synthesized adsorbents increased with the increasing Ag doped amount, and the maximum adsorption capacity for 20%-Ag2 O-Ag2 O3 @ZIF-8 was 232...
July 21, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30055356/a-novel-three-dimensional-heterojunction-photocatalyst-for-the-photocatalytic-oxidation-of-crystal-violet-and-reduction-of-cr-6
#6
Dai Benlin, Xinyue Tu, Wei Zhao, Xiaomeng Wang, Dennis Y C Leung, Jiming Xu
A novel 3-D heterojunction photocatalyst Ag2 CO3 /BiVO4 was successfully fabricated. It exhibits excellent photocatalytic performances for the photocatalytic oxidation of crystal violet and reduction of Cr6+ , which is ascribed to the suppression of charge recombination, and increasing lifetime of the charge carriers confirmed by the result of time-resolved fluorescence emission decay spectra and photoelectrochemical measures. The electron spin resonance result also suggests that heterojunction structure can improve separation efficiency of photogenerated carriers and favor to form •OH radicals...
July 23, 2018: Chemosphere
https://www.readbyqxmd.com/read/30047312/metal-sensitive-and-dna-concentration-dependent-structural-rearrangement-of-short-oligonucleotide-into-large-suprastructures
#7
J Shankaraswamy, Shikhar Tyagi, Anju Singh, Daisuke Miyoshi, Sarika Saxena
Formation of higher order structures, such as G-quadruplexes and G-quadruplex based large suprastructures into long G-wires and liquid crystals is promising elements for use in healthcare for drug delivery as they are mechanically and thermally stable. In this study, we studied the structures of short 11-mer oligonucleotide 5'-G2 AG5 AG2 -3'(11Pu) which is observed in 3'-UTR region of c-jun protooncogene. We used Circular Dichroism, UV-thermal melting, Native Gel Electrophoresis and Atomic Force Microscopy to determine the structure of 11Pu...
July 26, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/30036828/fabrication-of-pure-and-moxifloxacin-functionalized-silver-oxide-nanoparticles-for-photocatalytic-and-antimicrobial-activity
#8
Sirajul Haq, Wajid Rehman, Muhammad Waseem, Vera Meynen, Saif Ullah Awan, Shaukat Saeed, Naseem Iqbal
This paper reports the synthesis of silver oxide (Ag2 O) and moxifloxacin functionalized silver oxide (M-Ag2 O) nanoparticles for photocatalytic and antimicrobial activity. The Ag2 O nanoparticles were synthesized by using 2 dimethyl amino ethanol as reducing agent. The BET surface area measured from N2 adsorption method was found to be 16.89 m2 /g. The mix (cubic and hexagonal) phase of silver oxide (Ag2 O) nanoparticles was confirmed by X-rays diffraction (XRD). The extra diffracted peaks were observed after moxifloxacin fictionalization...
September 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/30024098/modulated-triple-material-nano-heterostructures-where-gold-influenced-the-chemical-activity-of-silver-in-nanocrystals
#9
Puspanjali Sahu, Gyanaranjan Prusty, Amit K Guria, Narayan Pradhan
For efficient charge separations, multimaterial hetero-nanostructures are being extensively studied as photocatalysts. While materials with one heterojunction are widely established, the chemistry of formation of multijunction heterostructures is not explored. This needs a more sophisticated approach and modulations. To achieve these, a generic multistep seed mediated growth following controlled ion diffusion and ion exchange is reported which successfully leads to triple-material hetero-nanostructures with bimetallic-binary alloy-binary/ternary semiconductors arrangements...
July 19, 2018: Small
https://www.readbyqxmd.com/read/30018950/dispersed-ag-2-o-ag-on-cnt-graphene-composite-an-implication-for-magnificent-photoreduction-and-energy-storage-applications
#10
Mohamed Mokhtar Mohamed, M Khairy, Ahmed Ibrahem
A simple hydrothermal route assisted by a triblock copolymer was used to synthesize Ag2 O/Ag nanoparticles on a robotic support consists of functionalized MWCNTs and graphene composite (Ag2 O/Ag/CNT-graphene). The composites together with the individual analog of Ag/CNT and Ag/graphene were characterized by means of XRD, TEM-SAED, N2 sorptiometry, Raman, FTIR, UV-Vis, and photoluminescence spectroscopy. These nanomaterials were then tested for the catalytic reduction of 4-nitrophenol (4-NP) to the technologically beneficial 4-aminophenol (4-AP)...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/30009408/from-in-doped-ag2s-to-agins2-nanocrystals-low-temperature-in-situ-conversion-of-colloidal-ag2s-nanoparticles-and-their-nir-fluorescence
#11
Huishan Shang, Qiumei Di, Muwei Ji, Bing Bai, Jiajia Liu, Wenxing Chen, Meng Xu, Hongpan Rong, Jia Liu, Jiatao Zhang
Focusing on ternary I-III-VI2 colloidal nanocrystals synthesis with precise control of composition (from doping to ternary composition) and NIR fluorescence performance, monodisperse binary In3+ doped Ag2S NCs and Ternary AgInS2 NCs have been achieved successfully by facile low temperature in-situ conversion of colloidal Ag2S nanoparticles. Here, In3+ ions are inserted into the crystal lattice of Ag2S NCs at relative low temperature as dopant following phase transition to be ternary AgInS2 NCs at relative high temperature...
July 16, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30001113/near-infrared-light-excited-and-localized-surface-plasmon-resonance-enhanced-photoelectrochemical-biosensing-platform-for-cell-analysis
#12
Ruyan Li, Wenwen Tu, Huaisheng Wang, Zhihui Dai
Under near-infrared (NIR) light of 810 nm wavelength for irradiation, a very simple and highly sensitive photoelectrochemical (PEC) biosensing platform has been established using the localized surface plasmon resonance effect of Au nanoparticles (NPs) as signal amplification for the nondestructive analysis of living cells. The water-dispersible Ag2 S quantum dots (QDs) synthesized by a one pot method were employed as photoelectrochemically active species, and they exhibited excellent PEC properties irradiated with NIR light which was chosen due to the obvious absorption and fluorescent emission in the NIR light region...
July 24, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29993311/theranostic-niosomes-for-direct-intratumoral-injection-marked-enhancement-in-tumor-retention-and-anticancer-efficacy
#13
Fatemeh Nowroozi, Simin Dadashzadeh, Hoorieh Soleimanjahi, Azadeh Haeri, Soraya Shahhosseini, Jaber Javidi, Hesam Karimi
AIM: For simultaneous bioimaging and drug delivery via direct intratumoral injection, doxorubicin and Ag2 S quantum dots co-loaded multifunctional niosomes were prepared and fully characterized. MATERIALS & METHODS: Various theranostic niosomes were prepared and investigated regarding cytotoxicity, in vivo imaging, drug accumulation in breast cancer tumor and antitumor activity. RESULTS: Niosomes composed of Tween-60, Tween-80 or Span 60 produced strong and more durable detectable fluorescence signals...
July 11, 2018: Nanomedicine
https://www.readbyqxmd.com/read/29993004/silver-oxide-decomposition-mediated-direct-bonding-of-silicon-based-materials
#14
Tomoki Matsuda, Kota Inami, Keita Motoyama, Tomokazu Sano, Akio Hirose
Silicon-based materials are widely promising electronic components by the combination with metals in power electronics field. However, bonding metal and silicon-based materials generally requires specific surface modification due to their different chemical bonds. Here, we demonstrate a process for directly bonding metals to silicon-based materials that does not require surface treatment, based on the in situ decomposition of Ag2 O paste, forming Ag nanoparticles (AgNPs). We demonstrate sound joints of Ag/silicon-based materials at 300-500 °C with the formation of a silicon oxide interlayer containing AgNPs...
July 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29992458/a-novel-fluorescent-nanoparticle-for-sensitive-detection-of-cry1ab-protein-in-vitro-and-in-vivo
#15
Xiao Xu, Hao Chen, Yuancheng Cao, Yongjun Lin, Jun'an Liu
Here, we report the synthesis and characterization of CoFe2 O4 doping Ag2 S dendrimer-modified nanoparticles (CoFe2 O4 -Ag2 S DMNs) in Cry1Ab protein detection and imaging. The near-infrared Ag2 S quantum dots were first prepared by using the thermal decomposition method, followed by modification of the water-soluble quantum dots using the method of solvent evaporation and ligand exchange, and finally the fluorescent magnetic bifunctional nanoparticles were obtained by binding with CoFe2 O4 . As-prepared CoFe2 O4 -Ag2 S DMNs were characterized by fluorescence (FL) spectroscopy and transmission electron microscopy (TEM)...
July 10, 2018: Journal of Fluorescence
https://www.readbyqxmd.com/read/29990785/insight-on-the-plasmonic-z-scheme-mechanism-underlying-the-highly-efficient-photocatalytic-activity-of-silver-molybdate-silver-vanadate-composite-in-rhodamine-b-degradation
#16
Yingcong Xie, Youzhi Dai, Xingzhong Yuan, Longbo Jiang, Lulu Zhou, Zhibin Wu, Jin Zhang, Hou Wang, Ting Xiong
A facile deposition-precipitation method was applied to synthesize novel plasmonic Z-scheme Ag2 MoO4 /Ag3 VO4 photocatalysts with different molar ratios of Ag2 MoO4 . The morphological, structural, and spectroscopic properties of the as-obtained samples were characterized through X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectral analysis. The photocatalytic performance of the synthesized photocatalysts in rhodamine B (RhB) degradation under visible light irradiation was evaluated...
April 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29986299/mechanical-degradation-and-drug-release-behavior-of-nano-grained-fe-ag-composites-for-biomedical-applications
#17
A Sharipova, S K Swain, I Gotman, D Starosvetsky, S G Psakhie, R Unger, E Y Gutmanas
An original fabrication route of high-strength bulk Fe-5Ag and Fe-10Ag nanocomposites with enhanced degradation rate is reported. Near fully dense materials with fine nanostructures and uniform distribution of Ag nanoparticles were obtained employing high energy attrition milling of Fe-Ag2 O powder blends followed by cold sintering - high pressure consolidation at ambient temperature that allowed the retention of the nanoscale structure. Annealing in hydrogen flow at 550 °C resulted in enhanced ductility without coarsening the nanostructure...
October 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29974438/influence-of-nano-additive-on-performance-and-emission-characteristics-of-a-diesel-engine-running-on-neat-neem-oil-biodiesel
#18
Yuvarajan Devarajan, Dinesh Babu Munuswamy, Arulprakasajothi Mahalingam
This work investigates the experimental study to examine the operation characteristics of a neat neem oil methyl ester (BD100) along with silver oxide nano-particles as a metal-based additive in various mass fractions. Silver oxide nano-particle is mixed into 100% of BD100 at 5 and 10 ppm. The experimental investigation on diesel engine reveals that the addition of silver oxide nano-particles to BD100 resulted in enhancement of brake thermal efficiency (BTE) with a reduction in brake specific fuel consumption (BSFC)...
July 4, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29969254/impact-of-high-pressure-on-metallophilic-interactions-and-its-consequences-for-spectroscopic-properties-of-a-model-tetranuclear-silver-i-copper-i-complex-in-the-solid-state
#19
Katarzyna N Jarzembska, Radosław Kamiński, Kamil F Dziubek, Margherita Citroni, Damian Paliwoda, Krzysztof Durka, Samuele Fanetti, Roberto Bini
Structure-property relationships were investigated via combined high-pressure spectroscopic and X-ray diffraction techniques for a model luminescent Ag2 Cu2 L4 (L = 2-diphenylphosphino-3-methylindole) complex in the crystalline state. The experimental results were contributed by theoretical calculations, compared with the previously evaluated light-induced geometrical changes, and discussed in the context of available literature to date. To the best of our knowledge, this is the first study of this kind devoted to a coinage-metal complex for which the argentophilic interactions are crucial...
July 16, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29960951/promising-effects-of-silver-tungstate-microcrystals-on-fibroblast-human-cells-and-three-dimensional-collagen-matrix-models-a-novel-non-cytotoxic-material-to-fight-oral-disease
#20
Natali Lisette Haro Chávez, Erica Dorigatti de Avila, Paula Aboud Barbugli, Regiane Cristina de Oliveira, Camila Cristina de Foggi, Elson Longo, Carlos Eduardo Vergani
Silver tungstate (α-Ag2 WO4 ) microcrystals have shown encouraging results regarding their antimicrobial activity. However, in addition to the promising outcomes in fighting oral disease, cytotoxic tests are mandatory for screening new materials for biological applications. Here, we developed a better understanding of the effects of microcrystals on the behavior of both human gingival fibroblast (HGF) cells and three-dimensional (3D) collagen matrices. To perform these experiments, the lowest concentration of α-Ag2 WO4 capable of preventing the visible growth of Candida albicans (C...
June 18, 2018: Colloids and Surfaces. B, Biointerfaces
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