Many important aspects of nanosilver behavior are influenced by the ionic activity associated with particle suspension, including antibacterial potency, eukaryotic toxicity, environmental release, and persistence. The present study synthesizes pure, ion-free, citrate-stabilized (nAg) colloids as model systems, measures their time-dependent release dissolved silver using centrifugal ultrafiltration atomic absorption spectroscopy. Ion is shown to be a cooperative oxidation process requiring...

Major pathways in the antibacterial activity and eukaryotic toxicity of nanosilver involve silver cation its soluble complexes, which are well established thiol toxicants. Through these pathways, behaves analogy to a drug delivery system, particle contains concentrated inventory an active species, ion, is transported released near biological target sites. Although importance ion response widely recognized, paradigm has not been developed for this there significant potential improve...

The widespread use of silver nanoparticles (Ag-NPs) in consumer and medical products provides strong motivation for a careful assessment their environmental human health risks. Recent studies have shown that Ag-NPs released to the natural environment undergo profound chemical transformations can affect bioavailability, toxicity, risk. Less is known about Ag-NP biological systems, though literature clearly reports chronic ingestion produces argyrial deposits consisting silver-, sulfur-,...

Among the many new engineered nanomaterials, nanosilver is one of highest priority cases for environmental risk assessment. Recent analysis field samples from water treatment facilities suggests that silver converted to sulfide, whose very low solubility may limit bioavailability and adverse impact in environment. The present study demonstrates nanoparticles react with dissolved sulfide species (H2S, HS–) under relevant but controlled laboratory conditions produce nanostructures similar...

An asymmetric gel polymer electrolyte is designed for regulating ions and suppressing Li dendrite growth in high-performance metal batteries.

The increasing application of engineered nanomaterials (ENMs) in consumer and medical products has motivated the development single-particle inductively coupled plasma mass spectrometry (spICP-MS) for characterizing nanoparticles under realistic environmental exposure conditions. Recent studies have established a set metrological criteria evaluated feasibility spICP-MS sizing or quantifying various highly commercialized ENMs. However, less is known about performance detecting with sizes...

A series of Al complexes containing phenoxyimine ligands the types R1(R2)Al[O-2-tBu-6-{(C6F5)N═CH}C6H3] [R1, R2 = Me, Me (1a); Et, Et (1b); Cl (1c)] and Me2Al[O-2-tBu-6-(ArN═CH)C6H3] [Ar 2,6-F2C6H3 (2a), 2,4-F2C6H3 (3a), 3,4-F2C6H3 (4a)] have been prepared identified on basis NMR spectra elemental analyses. Their structures were determined by X-ray crystallography, these fold a distorted tetrahedral geometry around Al. The ring-opening polymerizations (ROPs) ε-caprolactone (CL) using 1a−c in...

Bioactive membranes with growth factors that mimic the physiological microenvironment of periodontal tissues have shown great potential for guided tissue regeneration (GTR). However, loss bioactivity and uncontrolled drug release in conventional limit their efficacy. In addition, local infection control ability would provide additional benefits to regeneration. this work, nanoengineered factor antibiotic delivery capabilities were developed achieve dual functions efficient GTR. Mesoporous...

CpTiCl2(NCtBu2) exhibits both remarkable catalytic activity and efficient norbornene (NBE) incorporation for ethylene–NBE copolymerization: the NBE by Cp′TiCl2(X) (X = NCtBu2, O-2,6-iPr2C6H3; Cp′ Cp, C5Me5, indenyl) was related to calculated coordination energy after ethylene insertion.

Al complexes containing phenoxy-imine ligands of type, Me2Al[O-2-R1-6-(R2NCH)C6H3] [R1 = Me, R2 2,6-iPr2C6H3 (1a), tBu (1b); R1 tBu, (2a), (2b), cyclohexyl (2c), adamantyl (2d), C6H5 (2e), 2,6-Me2C6H3 (2f), C6F5 (2g)] have been prepared in high yields from AlMe3 by treating with 1.0 equiv. 2-R1-6-(R2NCH)C6H3OH n-hexane. Structures for 1a, 1b, 2a–e and 2g were determined X-ray crystallography, these a distorted tetrahedral geometry around Al; both the Al–O Al–N bond distances influenced...

Exclusive repeated insertion of 1,7-octadiene (OD) has been achieved in OD polymerization using (C5Me5)TiCl2(O-2,6-iPr2C6H3)−MAO catalyst to afford polymers containing terminal olefinic double bonds the side chain. Copolymerization with 1-octene same afforded high molecular weight copolymers olefins, and quantitative introduction hydroxyl group could be upon treatment copolymer 9-BBN/NaOH−H2O2 (aq); ring-opening ε-caprolactone initiated a controlled manner from after AlEt3.

A series of novel aluminium complexes containing cyclic β-ketiminato ligands type Me2Al{O-[(ArN=CHC4H4(C6H4))]} (3a, Ar = 2,6-(i)Pr2C6H3; 3b, C6H5; 3c, C6F5) have been prepared in high yields. These were identified by (1)H, (13)C NMR spectroscopy and elemental analysis. X-ray structural analyses for 3a-c revealed that these a distorted tetrahedral geometry around Al, both bond distances angles considerably influenced the ligand structure. tested as catalyst precursors ring-opening...

Improving time-to-first-token (TTFT) is an essentially important objective in modern large language model (LLM) inference engines. Because optimizing TTFT directly results higher maximal QPS and meets the requirements of many critical applications. However, boosting notoriously challenging since it purely compute-bounded performance bottleneck shifts from self-attention to MLP part. We present SpecPrefill, a training free framework that accelerates for both long medium context queries based...

Most nanomaterials enter the natural environment as nanoenabled products, which are typically composites with primary nanoparticles bound on substrates or embedded in liquid solid matrices. The environmental risks associated these products expected to differ from those as-produced particles. This article presents a case study end-of-life emission of commercial prototype polymer/quantum-dot (QD) composite used solid-state lighting for homes. We report extent cadmium release upon exposure...

A series of novel binuclear phenoxyimino organoaluminum complexes the type [(RNCH)C6H3OAlMe2]2 [R = C6H5 (2a), 2,6-iPr2C6H3 (2b), 2,6-Ph2C6H3 (2c), adamantyl (2d), tBu (2e)] have been prepared in high yields, and these were identified by 1H, 13C NMR elemental analysis. Structural analysis for 2a–e revealed that a distorted tetrahedral geometry around Al both Al–O Al–N bond distances considerably influenced substituents imino groups. The tested as catalyst precursors ring-opening...

A new family of binuclear lanthanide compounds general formula [Ln(2,4-DClBA)3phen]2 (Ln(III) = Nd (1), Sm (2), Dy (3), Yb (4); 2,4-DClBA 2,4-dichlorobenzoate; phen 1,10-phenanthroline) have been synthesized and characterized by elemental analysis, molar conductance, infrared spectroscopy, ultraviolet spectra, thermogravimetric single-crystal X-ray diffraction. On the basis crystallography, 2–4 belong to triclinic crystal system, PI̅ space group. In compound 2, Sm3+ ion adopted a distorted...

Cisplatin-complexed gold nanoparticles (PtII-AuNP) provide a promising strategy for chemo-radiation-based anticancer drugs. Effective design of such platforms necessitates reliable assessment surface engineering on quantitative basis and its influence drug payload, stability, release. In this paper, poly(ethylene glycol) (PEG)-stabilized PtII-AuNP was synthesized as model antitumor platform, where PtII is attached via carboxyl-terminated dendron ligand. Surface modification by PEG loading,...

The novel hyphenation of electrospray-differential mobility analysis with single particle inductively coupled plasma mass spectrometry (ES-DMA-spICPMS) was demonstrated the capacity for real-time size, mass, and concentration measurement nanoparticles (NPs) on a particle-to-particle basis. In this proof-of-concept study, feasibility technique validated through both calibration using NIST gold NP reference materials. A detection limit 10(5) NPs mL(-1) determined under current experimental...

Abstract The (cyclopentadienyl)(ketimide)titanium(IV) complex ( t‐ BuC 5 H 4 )TiCl 2 [N=C( Bu) ] exhibited remarkable catalytic activities (1.99–3.16×10 kg polymer/mol Ti⋅h) with efficient cyclopentene incorporation in ethylene/cyclopentene copolymerization the presence of methylaluminoxane (MAO). polymerization took place exclusive 1,2‐cyclopentene incorporation, affording high molecular weight (alternating) copolymers (cyclopentene<43.6 mol %) uniform distributions. effect...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTEfficient Functional Group Introduction into Polyolefins by Copolymerization of Ethylene with Allyltrialkylsilane Using Nonbridged Half-TitanocenesJingyu Liu and Kotohiro NomuraView Author Information Graduate School Materials Science, Nara Institute Science Technology (NAIST), 8916-5 Takayama, Ikoma, 630-0101, Japan Cite this: Macromolecules 2008, 41, 4, 1070–1072Publication Date (Web):January 23,...