240,642 results match your criteria 'silver nanoparticles


Combining "Grafting to" and "Grafting from" to synthesize comb-like NCC-g-PLA as a macromolecular modifying agent of PLA.

Nanotechnology 2021 Jun 15. Epub 2021 Jun 15.

Sichuan University, Chengdu, Chengdu, Sichuan, 610065, CHINA.

The surface modification of nano particles is very important in nanotechnology. Grafting from (GF) and grafting to (GT) are two main methods to prepare surface modified nanoparticles like nanocellulose crystalline (NCC) grafted with polylactic acid (PLA) chains. In the GF method, the NCC can get high grafting degree but short side chains to improve its compatibility with the polymer matrix. Read More

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Exosome-based hybrid nanostructures for enhanced tumor targeting and hyperthermia therapy.

Colloids Surf B Biointerfaces 2021 Jun 8;205:111915. Epub 2021 Jun 8.

Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea. Electronic address:

Recently, natural exosomes have attracted attention as an ideal drug carrier to overcome the limitations of existing drug delivery systems which are toxicity induction and low cancer-targeting performance. In this study, we propose an exosome-based hybrid nanostructure (EHN) with improved targeting ability and therapeutic efficacy against colorectal cancer by using exosomes isolated from the tumor cell line as a drug carrier. The proposed EHN can have high biocompatibility by using exosomes, a biologically derived material, and show improved targeting performance by adding a tumor-targeting ligand (folic acid). Read More

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Evaluation of the sequential coupling of a bacterial treatment with a physicochemical process for the remediation of wastewater containing Cr and organic pollutants.

J Hazard Mater 2021 Jun 6;418:126307. Epub 2021 Jun 6.

Planta Piloto de Procesos Industriales Microbiológicos (PROIMI), CONICET, Av. Belgrano y Pasaje Caseros, 4000 Tucumán, Argentina; Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Miguel Lillo 205, 4000 Tucumán, Argentina. Electronic address:

A restoration strategy was developed for the treatment of two artificial liquid systems (Minimal Medium, MM, and Water Carbon Nitrogen, WCN) contaminated with Cr(VI), lindane (γ-HCH), phenanthrene (Phe), and reactive black 5 (RB5), through the use of an actinobacteria consortium, coupled with a physicochemical treatment using a column filled with nano-scale zero valent iron particles immobilized on dried Macrocystis pyrifera algae biomass. The Sequential Treatment A (ST: physicochemical followed by biological method) removed the three organic compounds with different effectiveness; however, it was very ineffective for Cr(VI) removal. The Sequential Treatment B (ST: biological followed by the physicochemical method) removed the four compounds with variable efficiencies. Read More

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Foliar absorption and field herbicidal studies of atrazine-loaded polymeric nanoparticles.

J Hazard Mater 2021 Jun 7;418:126350. Epub 2021 Jun 7.

Institute of Science and Technology, São Paulo State University (UNESP), Av. Três de Março 511, 18087-180 Sorocaba, SP, Brazil. Electronic address:

Nanoparticles loaded with atrazine show weed control efficacy even with lower application doses of the active ingredient. Changes in the mode of action of the herbicide through the nanoformulation are key to understanding the efficiency of post-emergence activity of nanoatrazine. Here, we report the leaf absorption and translocation of nanoatrazine and atrazine employing radiometric techniques and compare their herbicidal effects in greenhouse and field conditions. Read More

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Insight into the inhibitory mechanism of soluble ionic liquids on the transport of TiO nanoparticles in saturated porous media: Roles of alkyl chain lengths and counteranion types.

J Hazard Mater 2021 Jun 10;418:126367. Epub 2021 Jun 10.

Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China. Electronic address:

Column experiments were carried out to investigate the transport of TiO nanoparticles (nTiO) in water-saturated porous media in the presence of various imidazolium-based ionic liquids (ILs) with different alkyl chain lengths and counteranions. The results indicated that the effects of ILs on nTiO transport were considerably dependent upon IL species. In general, the transport-inhibition effects increased with the increasing length of branched alkyl chain on the ILs (i. Read More

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Recent trends in bioresponsive linker technologies of Prodrug-Based Self-Assembling nanomaterials.

Biomaterials 2021 Jun 5;275:120955. Epub 2021 Jun 5.

Faculty of Pharmaceutical Sciences, University of British Columbia, 2405 Wesbrook Mall, Vancouver, British Columbia, V6T 1Z3, Canada. Electronic address:

Prodrugs are designed to improve pharmaceutical properties of potent compounds and represent a central approach in drug development. The success of the prodrug strategy relies on incorporation of a reversible linkage facilitating controlled release of the parent drug. While prodrug approaches enhance pharmacokinetic properties over their parent drug, they still face challenges in absorption, distribution, metabolism, elimination, and toxicity (ADMET). Read More

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The crucial role of heavy metals on the interaction of engineered nanoparticles with polystyrene microplastics.

Water Res 2021 Jun 1;201:117317. Epub 2021 Jun 1.

Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, HKSAR, P.R.China; HKBU Institute of Research and Continuing Education, Shenzhen Virtual University Park, Shenzhen, P.R.China. Electronic address:

Despite continuous research on microplastics (MPs), studies exploring the complexity of interaction between MPs and other aqueous constituents in multi-solute systems are scarce. In this study, the uptake and release of nanoceria (CeNPs) by various polystyrene MPs (PSMPs) were investigated. Results showed that PSMPs in the presence of heavy metals (HMs) exhibited a substantially higher sorption affinity for isotropic charged CeNPs than PSMPs alone; this enhanced affinity was attributed to the formation of PSMP-HM-CeNP complexes. Read More

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Degradation of amoxicillin with sono, photo, and sonophotocatalytic oxidation under low-frequency ultrasound and visible light.

Environ Res 2021 Jun 12;200:111515. Epub 2021 Jun 12.

Environmental Science and Engineering Department, Indian Institute of Technology Bombay, Mumbai, 400 076, India. Electronic address:

The presence of pharmaceutically active compounds in aquatic bodies is a global concern, and suitable treatment technologies are required. In this study, the efficacy of photocatalytic, sonocatalytic, and sonophotocatalytic oxidation processes for the degradation of amoxicillin (AMX) was investigated using visible light with N doped TiO (N-TiO) nanoparticles as the catalyst and low-frequency ultrasound in a novel multifrequency reactor. The influence of different operational parameters on the extent of AMX degradation was studied. Read More

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Removal of triclosan from water by sepiolite supported bimetallic Fe/Ni nanoparticles.

Environ Technol 2021 Jun 15:1-10. Epub 2021 Jun 15.

Institute of Environmental pollution and health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, People's Republic of China.

A simple and low-cost route to fabricate sepiolite-supported bimetallic Fe/Ni (Sep-Fe/Ni) nanoparticles was obtained by synchronous liquid phase reduction method. The as prepared composite was used to remove triclosan (TCS) from aqueous solutions. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller (BET) analysis were used for characterization of the materials. Read More

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Solid-State NMR Study to Probe the Effects of Divalent Metal Ions (Ca and Mg) on the Magnetic Alignment of Polymer-Based Lipid Nanodiscs.

Langmuir 2021 Jun 15. Epub 2021 Jun 15.

Biophysics Program and Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, The University of Michigan, Ann Arbor, Michigan 48109-1055, United States.

Divalent cations, especially Ca and Mg, play a vital role in the function of biomolecules and making them important to be constituents in samples for in vitro biophysical and biochemical characterizations. Although lipid nanodiscs are becoming valuable tools for structural biology studies on membrane proteins and for drug delivery, most types of nanodiscs used in these studies are unstable in the presence of divalent metal ions. To avoid the interaction of divalent metal ions with the belt of the nanodiscs, synthetic polymers have been designed and demonstrated to form stable lipid nanodiscs under such unstable conditions. Read More

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Self-Assembled Nanobodies as Selectively Targeted, Nanostructured, and Multivalent Materials.

ACS Appl Mater Interfaces 2021 Jun 15. Epub 2021 Jun 15.

Laboratory for Environmental and Life Sciences, University of Nova Gorica Nova Gorica 5000, Slovenia.

Nanobodies represent valuable tools in advanced therapeutic strategies but their small size (∼2.5 × ∼ 4 nm) and limited valence for interactions might pose restrictions for applications, especially regarding their modest capacity for multivalent and cooperative interaction. In this work, modular protein constructs have been designed, in which nanobodies are fused to protein domains to provide further functionalities and to favor oligomerization into stable self-assembled nanoparticles. Read More

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Construction of a pH/TGase "Dual Key"-Responsive Gold Nano-radiosensitizer with Liver Tumor-Targeting Ability.

ACS Biomater Sci Eng 2021 Jun 15. Epub 2021 Jun 15.

Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.

The method of tumor microenvironment (TME)-responsive aggregation has become a promising approach to enhance treatment effect by improving the accumulation of nanoparticles in tumors. The enzymatic cross-linking strategy has widely attracted attention owing to its good aggregation stability and biocompatibility. However, the enzymes in nontumor tissue can also catalyze the cross-linking reaction and reduce accumulation of nanoparticles in tumor. Read More

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Co-delivery of Phagocytosis Checkpoint Silencer and Stimulator of Interferon Genes Agonist for Synergetic Cancer Immunotherapy.

ACS Appl Mater Interfaces 2021 Jun 15. Epub 2021 Jun 15.

School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou 511442, P.R. China.

Efficient capture and presentation of tumor antigens by antigen-presenting cells (APCs), especially dendritic cells (DCs), are crucial for activating the anti-tumor immunity. However, APCs are immunosuppressed in the tumor microenvironment, which hinders the tumor elimination. To reprogram APCs for inducing strong anti-tumor immunity, we report here a co-delivery immunotherapeutic strategy targeting the phagocytosis checkpoint (signal regulatory protein α, SIRPα) and stimulator of interferon genes (STING) of APCs to jointly enhance their ability of capturing and presenting tumor antigens. Read More

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Asparaginyl Ligase-Catalyzed One-Step Cell Surface Modification of Red Blood Cells.

ACS Chem Biol 2021 Jun 15. Epub 2021 Jun 15.

Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachussets 02115, United States.

Red blood cells (RBCs) can serve as vascular carriers for drugs, proteins, peptides, and nanoparticles. Human RBCs remain in the circulation for ∼120 days, are biocompatible, and are immunologically largely inert. RBCs are cleared by the reticuloendothelial system and can induce immune tolerance to foreign components attached to the RBC surface. Read More

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Influence of Iron Sulfide Nanoparticle Sizes in Solid-State Batteries.

Angew Chem Int Ed Engl 2021 Jun 15. Epub 2021 Jun 15.

Westfalische Wilhelms-Universitat Munster, Institute für Anorganische und Analytische Chemie, Correnstrasse 30, 48149, Münster, GERMANY.

Given the inherent performance limitations of intercalation-based lithium-ion batteries, solid-state conversion batteries are promising systems for future energy storage. A high specific capacity and natural abundancy make iron disulfide (FeS 2 ) a promising cathode active material. In this work, FeS 2  nanoparticles were prepared solvothermally. Read More

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Reductive and adsorptive elimination of U(VI) ions in aqueous solution by [email protected] composites.

Environ Sci Pollut Res Int 2021 Jun 15. Epub 2021 Jun 15.

School of Life Science, Shaoxing University, Shaoxing, 312000, People's Republic of China.

The novel biochar supported by starch and nanoscale iron sulfide ([email protected]) composites were successfully prepared through coupling of biochar derived from peanut shell with nanoscale ferrous sulfide and starch under nitrogen atmosphere. It had the advantages of biochar, starch, and nanoscale ferrous sulfide. Therefore, it could overcome some shortcomings. Read More

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The effect of different chelators on the dislodgement resistance of MTA Repair HP, MTA Angelus, and MTA Flow.

Odontology 2021 Jun 15. Epub 2021 Jun 15.

Department of Endodontics, Faculty of Dentistry, Antalya Bilim University, Antalya, Turkey.

The aim of this study was to investigate the influence of various irrigants on the dislodgement resistance of MTA Repair HP, MTA Angelus, and MTA Flow to root dentin. Three slices (1.0 ± 0. Read More

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Rapid Surface-Enhanced Raman Spectroscopy Detection of Chlorothalonil in Standard Solution and Orange Peels with Pretreatment of Ultraviolet Irradiation.

Bull Environ Contam Toxicol 2021 Jun 15. Epub 2021 Jun 15.

State Key Laboratory of Food Science and Technology, Jiangnan University, No.1800 Lihu Avenue, Wuxi, 214122, Jiangsu, China.

At present, the detection of chlorothalonil is generally based on chromatography and immunoassay; both of which are time-consuming and costly. In this study, Surface-enhanced Raman Spectroscopy (SERS) has been successfully utilized in the detection of chlorothalonil coupled with photochemistry and meanwhile, gold nanoparticles were prepared to enhance the Raman signal. Two Raman peaks (2246 cm and 2140 cm) of chlorothalonil were appeared after ultraviolet (UV) irradiation compared to the original solution. Read More

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Tuning the Surface Chemistry of Second-Harmonic-Active Lithium Niobate Nanoprobes Using a Silanol-Alcohol Condensation Reaction.

Langmuir 2021 Jun 15. Epub 2021 Jun 15.

Department of Chemistry and 4D LABS, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada.

The surface functionalization of nanoparticles (NPs) is of great interest for improving the use of NPs in, for example, therapeutic and diagnostic applications. The conjugation of specific molecules with NPs through the formation of covalent linkages is often sought to provide a high degree of colloidal stability and biocompatibility, as well as to provide functional groups for further surface modification. NPs of lithium niobate (LiNbO) have been explored for use in second-harmonic-generation (SHG)-based bioimaging, expanding the applications of SHG-based microscopy techniques. Read More

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Collective Nanoparticle Dynamics Associated with Bridging Network Formation in Model Polymer Nanocomposites.

ACS Nano 2021 Jun 15. Epub 2021 Jun 15.

Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States.

The addition of nanoparticles (NPs) to polymers is a powerful method to improve the mechanical and other properties of macromolecular materials. Such hybrid polymer-particle systems are also rich in fundamental soft matter physics. Among several factors contributing to mechanical reinforcement, a polymer-mediated NP network is considered to be the most important in polymer nanocomposites (PNCs). Read More

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Singlet Fission Dynamics of Colloidal Nanoparticles of a Perylenediimide Derivative in Solutions.

J Phys Chem B 2021 Jun 15. Epub 2021 Jun 15.

Department of Chemistry and Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.

Singlet fission (SF) is an intriguing process in which a singlet exciton produces two triplet excitons in molecular aggregates. Perylenediimide (PDI) derivatives are promising materials for SF-based photovoltaics, and the SF process in PDI aggregates is important to investigate for their applications. In this work, we studied the entire SF process occurring in the colloidal nanoparticles of a PDI derivative in solutions by using time-resolved fluorescence and transient absorption (TA) experiments. Read More

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Synthesis and pyrolysis of fullerenol-stabilized Pt nanocolloids for unique approach to Pt-doped carbon.

Chem Asian J 2021 Jun 14. Epub 2021 Jun 14.

Osaka University, Department of Appliwd Chemistry, 2-1 Yamada-oka, 565-0871, Suita, JAPAN.

An aqueous colloidal dispersion of Pt nanoparticles (NPs) stabilized by fullerenol C 60 (OH) 12 (Pt:C 60 (OH) 12 ) was successfully synthesized via liquid-phase chemical reduction. The subsequent pyrolysis of Pt:C 60 (OH) 12 at different temperatures was conducted to afford Pt-doped carbon with different chemical compositions (Pt:C60 n ). X-ray absorption spectroscopy (XAS) and Infrared (IR) absorption spectroscopy and thermogravimetric measurements revealed that the thus-prepared nanocomposite consists of Pt NPs and high valent Pt-C 60 (OH) 12 complex. Read More

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Water-soluble AIE-active Fluorescent Organic Nanoparticles: Design, Preparation and Application for Specific Detection of Cyanide in Water and Food Samples.

Chem Asian J 2021 Jun 14. Epub 2021 Jun 14.

College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China.

A dilactosyl-dicyanovinyl-functionalized tetraphenylethene (TPELC) was designed, synthesized and used for ratiometric sensing of cyanide. TPELC was comprised of three moieties (tetraphenylethylene, dicyanovinyl group and lactose unit) in one molecule, making TPELC water-soluble and aggregation-induced emission (AIE)-active and selectively reactive to cyanide. Compared with other reported fluorescent probes containing dicyanovinyl group, TPELC is the first AIE luminogen to be assembled as fluorescent organic nanoparticles (FONs) for sensing of cyanide in water without the use of surfactant or the help of organic solvents based on the nucleophilic addition reaction. Read More

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Designer Nanomaterials through Programmable Assembly.

Angew Chem Int Ed Engl 2021 Jun 14. Epub 2021 Jun 14.

Brookhaven National Laboratory, CFN, UNITED STATES.

Nanoparticles have long been recognized for their unique properties arising from their nanoscale morphology. While these phenomena offer exciting potential applications across optics, electronics, magnetism, and catalysis, these specific functions often require a designed organization of particles. This organizational control includes the type of order as well as placement and orientation of particles of the same or different kinds relative to each other. Read More

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Synthesis of SPIO Nanoparticles and the Subsequent Applications in Stem Cell Labeling for Parkinson's Disease.

Nanoscale Res Lett 2021 Jun 14;16(1):107. Epub 2021 Jun 14.

Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, No. 88 Keling Road, Suzhou New District, Suzhou, 215163, China.

Parkinson's disease (PD) is characterized by the progressive loss of dopaminergic neurons in the midbrain, and the stem cell transplantation method provides a promising strategy for the treatment. In these studies, tracking the biological behaviors of the transplanted cells in vivo is essential for a basic understanding of stem cell function and evaluation of clinical effectiveness. In the present study, we developed a novel ultrasmall superparamagnetic iron oxide nanoparticles coating with the polyacrylic acid (PAA) and methoxypolyethylene glycol amine (PEG) by thermal decomposition method and a two-step modification. Read More

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Correction to: Magnetic Nanoparticles as MRI Contrast Agents.

Top Curr Chem (Cham) 2021 Jun 14;379(4):30. Epub 2021 Jun 14.

BIONAND - Centro Andaluz de Nanomedicina y Biotecnología, Junta de Andalucía-Universidad de Málaga, C/Severo Ochoa, 35, 29590, Málaga, Spain.

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Non-invasive SERS serum detection technology combined with multivariate statistical algorithm for simultaneous screening of cervical cancer and breast cancer.

Anal Bioanal Chem 2021 Jun 14. Epub 2021 Jun 14.

First Affiliated Hospital of Xinjiang Medical University, Xinjiang, 830046, Urumqi, China.

Surface-enhanced Raman scattering (SERS), as a rapid, reliable and non-destructive spectral detection technology, has made a series of breakthrough achievements in screening and pre-diagnosis of various cancerous tumors. In this paper, high-performance gold nanoparticles/785 porous silicon photonic crystals (Au NPs/785 PSi PhCs) active SERS substrates were specially designed for serum testing, and realized highly sensitive detection of serum from healthy people, patients with cervical cancer and breast cancer. Based on the SERS spectra of the three groups of serum, the significant differences between the healthy group and cancer group at 1030 cm and 1051 cm were analyzed, and the similar but different serum SERS spectra of cervical cancer and breast cancer patients were compared. Read More

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The membrane-targeting mechanism of host defense peptides inspiring the design of polypeptide-conjugated gold nanoparticles exhibiting effective antibacterial activity against methicillin-resistant .

J Mater Chem B 2021 Jun 15. Epub 2021 Jun 15.

State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China. and Key Laboratory for Ultrafine Materials of Ministry of Education, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.

Multidrug-resistant bacterial infections are a grand challenge to global medical and health systems. Therefore, it is urgent to develop versatile antibacterial strategies that can combat bacterial resistance without displaying toxicity. Here, we synthesize antibacterial polypeptide-conjugated gold nanoparticles that exhibit potent antibacterial activities against clinically isolated multiple drug resistance Gram-positive bacteria, such as methicillin-resistant Staphylococcus aureus, and excellent in vitro and in vivo biocompatibility. Read More

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Insights from modeling into structure, entanglements, and dynamics in attractive polymer nanocomposites.

Soft Matter 2021 Jun 15. Epub 2021 Jun 15.

Materials Research and Technology, Luxembourg Institute of Science and Technology, 5, Avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg.

Conformations, entanglements and dynamics in attractive polymer nanocomposites are investigated in this work by means of coarse-grained molecular dynamics simulation, for both weak and strong confinements, in the presence of nanoparticles (NPs) at NP volume fractions φ up to 60%. We show that the behavior of the apparent tube diameter dapp in such nanocomposites can be greatly different from nanocomposites with nonattractive interactions. We find that this effect originates, based on a mean field argument, from the geometric confinement length dgeo at strong confinement (large φ) and not from the bound polymer layer on NPs (interparticle distance ID <2Rg) as proposed recently based on experimental measurements. Read More

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A potential barrier in the diffusion of nanoparticles in ordered polymer networks.

Authors:
Yu Lu Guo-Hui Hu

Soft Matter 2021 Jun 15. Epub 2021 Jun 15.

School of Mechanics and Engineering Science, Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai, China.

Diffusion of nanoparticles (NPs) in a polymer matrix is of significant importance in diverse research fields, such as bio-engineering and nano-technology. Although the prediction of the effective diffusivity has been extensively explored, it remains a great challenge for theoretical investigation. In the present study, the single-particle Dissipative Particle Dynamics (DPD) is employed to study the diffusion of nanoparticles in an unentangled ordered polymer network. Read More

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