97,079 results match your criteria nanoparticles synthesis

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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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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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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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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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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Green Synthesis of Silver Nanoparticles using Datura metel Flower Extract Assisted by Ultrasound Method and Its Antibacterial Activity.

Recent Pat Nanotechnol 2021 Jun 14. Epub 2021 Jun 14.

Laboratory of Materials for Energy and Environment, Chemistry Department, Universitas Islam Indonesia, Yogyakarta, Indonesia.

Background: Green synthesis method of nanoparticles has been developed for several years. Besides providing an environmental-friendly process, the green synthesis of nanoparticles using plant extract provides a synergistic effect of the secondary metabolite. In recent times, the study involving the intensification process in nanoparticle formation also attracts great attention. Read More

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An overview of zinc oxide nanoparticles produced by plant extracts for anti-tuberculosis treatments.

Curr Med Chem 2021 Jun 14. Epub 2021 Jun 14.

Department of Clinical Immunology, Institute of Clinical Laboratory Medicine, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, 523808, China.

Tuberculosis (TB), induced by Mycobacterium tuberculosis (MTB), is a fatal infectious disease that kills millions of lives worldwide. The emergence of drug-resistant and multidrug-resistant cases is regarded as one of the most challenging threats to TB control due to the low cure rate. Therefore, TB and drug-resistant TB epidemics urge us to explore more effective therapies. Read More

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Synthesis of Noble Metal [email protected] Yolk-Shell Nanoparticles with Thin Organic/Inorganic Hybrid Outer Shells via an Aqueous Medium Phase.

Langmuir 2021 Jun 1;37(23):7237-7245. Epub 2021 Jun 1.

Institute of Molecular Science and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, No. 72 Binhai Road, Jimo District, Qingdao, Shandong 266237, P. R. China.

A simple method is proposed for the synthesis of noble metal [email protected] (M = Au, Pd, Ag) yolk-shell nanoparticles. The effects of synthesis conditions on the preparation of yolk-shell nanoparticles were discussed in detail. According to the different corrosion resistances between inorganic silica and organosilicone in a selective etching solution, yolk-shell nanoparticles with large cavity and thin shell were prepared using the same aqueous medium in a step-by-step synthesis process. Read More

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Facile one-pot microwave assisted synthesis of rGO-CuS-ZnS hybrid nanocomposite cathode catalysts for microbial fuel cell application.

Chemosphere 2021 Sep 31;278:130426. Epub 2021 Mar 31.

Department of Civil Engineering, Yeungnam University, Gyeongsan, 38541, South Korea. Electronic address:

A reduced graphene oxide-copper sulfide-zinc sulfide (rGO-CuS-ZnS) hybrid nanocomposite was synthesized using a surfactant-free in-situ microwave technique. The in-situ microwave method was used to prepare 1-D ZnS nanorods and CuS nanoparticles decorated into the rGO nanosheets. The prepared hybrid nanocomposite catalysts were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping analysis, and X-ray photoelectron spectroscopy. Read More

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September 2021

Design and engineering colloidal magnetic particles for nanoscale thermometry.

Int J Magn Part Imaging 2020 ;6(2 Suppl 1)

Nanoscale Device Characterization Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.

Thermometry based on magnetic nanoparticles (MNPs) is an emerging technology that allows for remote temperature measurements throughout a volume that are impossible to achieve using conventional probe-based or optical methods. This metrology is based on the temperature-dependent nature of these particles' magnetization; however, commercially available MNPs generally display insufficient magneto-thermosensitivity for practical use in applications near room temperature. Here we present engineered MNPs based on cobalt-doped ferrites developed for 200 K - 400 K thermometry applications. Read More

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January 2020

The importance of nanoscale confinement to electrocatalytic performance.

Chem Sci 2019 Dec 11;11(5):1233-1240. Epub 2019 Dec 11.

School of Chemistry, Australian Centre for NanoMedicine, University of New South Wales Sydney 2052 Australia

Electrocatalytic nanoparticles that mimic the three-dimensional geometric architecture of enzymes where the reaction occurs down a substrate channel isolated from bulk solution, referred to herein as nanozymes, were used to explore the impact of nano-confinement on electrocatalytic reactions. Surfactant covered Pt-Ni nanozyme nanoparticles, with Ni etched from the nanoparticles, possess a nanoscale channel in which the active sites for electrocatalysis of oxygen reduction are located. Different particle compositions and etching parameters allowed synthesis of nanoparticles with different average substrate channel diameters that have varying amounts of nano-confinement. Read More

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December 2019

Structural properties of ultra-small thorium and uranium dioxide nanoparticles embedded in a covalent organic framework.

Chem Sci 2020 Apr 28;11(18):4648-4668. Epub 2020 Apr 28.

Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

We report the structural properties of ultra-small ThO and UO nanoparticles (NPs), which were synthesized without strong binding surface ligands by employing a covalent organic framework (COF-5) as an inert template. The resultant NPs were used to observe how structural properties are affected by decreasing grain size within bulk actinide oxides, which has implications for understanding the behavior of nuclear fuel materials. Through a comprehensive characterization strategy, we gain insight regarding how structure at the NP surface differs from the interior. Read More

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Synthesis of a binary alloy nanoparticle catalyst with an immiscible combination of Rh and Cu assisted by hydrogen spillover on a TiO support.

Chem Sci 2020 Apr 1;11(16):4194-4203. Epub 2020 Apr 1.

Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita Osaka 565-0871 Japan +81-6-6879-7457 +81-6-6879-7457.

This work demonstrated the use of TiO as a promising platform for the synthesis of non-equilibrium RhCu binary alloy nanoparticles (NPs). These metals are regarded as immiscible based on their phase diagram but form NPs with the aid of the significant hydrogen spillover on TiO with concurrent proton-electron transfer. The resulting RhCu/TiO exhibited 2. Read More

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Synthesis of unsymmetrically substituted triarylamines acceptorless dehydrogenative aromatization using a Pd/C and -toluenesulfonic acid hybrid relay catalyst.

Chem Sci 2020 Mar 25;11(16):4074-4084. Epub 2020 Mar 25.

Department of Applied Chemistry, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan +81-3-5841-7220.

An efficient and convenient procedure for synthesizing triarylamines based on a dehydrogenative aromatization strategy has been developed. A hybrid relay catalyst comprising carbon-supported Pd (Pd/C) and -toluenesulfonic acid (TsOH) was found to be effective for synthesizing a variety of triarylamines bearing different aryl groups starting from arylamines (diarylamines or anilines), using cyclohexanones as the arylation sources under acceptorless conditions with the release of gaseous H. The proposed reaction comprises the following relay steps: condensation of arylamines and cyclohexanones to produce imines or enamines, dehydrogenative aromatization of the imines or enamines over Pd nanoparticles (NPs), and elimination of H from the Pd NPs. Read More

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Shape-directed self-assembly of nanodumbbells into superstructure polymorphs.

Chem Sci 2020 Mar 27;11(16):4065-4073. Epub 2020 Mar 27.

Department of Chemistry, Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures, Southern University of Science and Technology (SUSTech) Shenzhen Guangdong 518055 China

Self-assembly of colloidal nanoparticles into ordered superstructures provides a promising route to create novel/enhanced functional materials. Much progress has been made in self-assembly of anisotropic nanoparticles, but the complexity and tunability of superstructures remain restricted by their available geometries. Here we report the controlled packing of nanodumbbells (NDs) with two spherical lobes connected by one rod-like middle bar into varied superstructure polymorphs. Read More

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Ultra-small cobalt nanoparticles from molecularly-defined Co-salen complexes for catalytic synthesis of amines.

Chem Sci 2020 Feb 21;11(11):2973-2981. Epub 2020 Feb 21.

Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Str. 29a 18059 Rostock Germany

We report the synthesis of generated cobalt nanoparticles from molecularly defined complexes as efficient and selective catalysts for reductive amination reactions. In the presence of ammonia and hydrogen, cobalt-salen complexes such as cobalt(ii)-,-bis(salicylidene)-1,2-phenylenediamine produce ultra-small (2-4 nm) cobalt-nanoparticles embedded in a carbon-nitrogen framework. The resulting materials constitute stable, reusable and magnetically separable catalysts, which enable the synthesis of linear and branched benzylic, heterocyclic and aliphatic primary amines from carbonyl compounds and ammonia. Read More

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February 2020

Alginate-based composites for environmental applications: A critical review.

Crit Rev Environ Sci Technol 2018 Dec;49(4):318-356

Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, USA.

Alginate-based composites have been extensively studied for applications in energy and environmental sectors due to their biocompatible, nontoxic, and cost-effective properties. This review is designed to provide an overview of the synthesis and application of alginate-based composites. In addition to an overview of current understanding of alginate biopolymer, gelation process, and cross-linking mechanisms, this work focuses on adsorption mechanisms and performance of different alginate-based composites for the removal of various pollutants including dyes, heavy metals, and antibiotics in water and wastewater. Read More

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December 2018

Elevated CO differently suppresses the arsenic oxide nanoparticles-induced stress in C3 (Hordeum vulgare) and C4 (Zea maize) plants via altered homeostasis in metabolites specifically proline and anthocyanin metabolism.

Plant Physiol Biochem 2021 Jun 6;166:235-245. Epub 2021 Jun 6.

Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef, 62511, Egypt; Integrated Molecular Plant Physiology Research, Department of Biology, University of Antwerp, Antwerp, Belgium.

Nano-sized arsenic oxide nanoparticles (AsO-NP) limit crop growth and productivity. AsO-NP represent a strong environmental hazard. The predicted rise in future atmospheric CO could boost plant growth both under optimal and heavy metal stress conditions. Read More

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Synthesis of magnetic nanoparticles functionalized with histidine and nickel to immobilize His-tagged enzymes using β-galactosidase as a model.

Int J Biol Macromol 2021 Jun 11;184:159-169. Epub 2021 Jun 11.

Food Biotechnology Laboratory, Biotechnology Graduate Program, University of Vale do Taquari - Univates, Lajeado, RS, Brazil. Electronic address:

The aim of this study was to synthesize iron magnetic nanoparticles functionalized with histidine and nickel (FeO-His-Ni) to be used as support materials for oriented immobilization of His-tagged recombinant enzymes of high molecular weight, using β-galactosidase as a model. The texture, morphology, magnetism, thermal stability, pH and temperature reaction conditions, and the kinetic parameters of the biocatalyst obtained were assessed. In addition, the operational stability of the biocatalyst in the lactose hydrolysis of cheese whey and skim milk by batch processes was also assessed. Read More

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Green Synthesis of Ciprofloxacin-Loaded Cerium Oxide/Chitosan Nanocarrier and Its Activity Against MRSA-Induced Mastitis.

J Pharm Sci 2021 Jun 11. Epub 2021 Jun 11.

Departments of Nanomedicine, California Innovations Corporation, San Diego, CA, USA. Electronic address:

Methicillin-resistant Staphylococcus aureus (MRSA)-induced mastitis is one of the biggest animal welfare issues and economic burdens worldwide. As a possible effective treatment, ciprofloxacin (CIP)-loaded cerium oxide (CeO)/chitosan (CS) nanocomposite was synthesized using an eco-friendly approach, characterized, and evaluated. From 350 mastitis-positive milk samples, 35 mecA-positive MRSA strains were confirmed by antibiotic sensitivity testing and PCR. Read More

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Biomolecular interactions of ultrasmall metallic nanoparticles and nanoclusters.

Nanoscale Adv 2021 Apr 28;3(11):2995-3027. Epub 2021 Apr 28.

BCBB, National Institute of Allergy and Infectious Diseases, NIH Bethesda MD 20892 USA

The use of nanoparticles (NPs) in biomedicine has made a gradual transition from proof-of-concept to clinical applications, with several NP types meeting regulatory approval or undergoing clinical trials. A new type of metallic nanostructures called ultrasmall nanoparticles (usNPs) and nanoclusters (NCs), while retaining essential properties of the larger (classical) NPs, have features common to bioactive proteins. This combination expands the potential use of usNPs and NCs to areas of diagnosis and therapy traditionally reserved for small-molecule medicine. Read More

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PEG-Neridronate-Modified NaYF:Gd,Yb,Tm/NaGdF Core-Shell Upconverting Nanoparticles for Bimodal Magnetic Resonance/Optical Luminescence Imaging.

ACS Omega 2021 Jun 17;6(22):14420-14429. Epub 2021 May 17.

Department of Polymer Particles, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, Prague 6, Prague 162 06, Czech Republic.

Upconverting nanoparticles are attracting extensive interest as a multimodal imaging tool. In this work, we report on the synthesis and characterization of gadolinium-enriched upconverting nanoparticles for bimodal magnetic resonance and optical luminescence imaging. NaYF:Gd,Yb,Tm core upconverting nanoparticles were obtained by a thermal coprecipitation of lanthanide oleate precursors in the presence of oleic acid as a stabilizer. Read More

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Boron Oxide Nanoparticles Exhibit Minor, Species-Specific Acute Toxicity to North-Temperate and Amazonian Freshwater Fishes.

Front Bioeng Biotechnol 2021 28;9:689933. Epub 2021 May 28.

Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB, Canada.

Boron oxide nanoparticles (nBO) are manufactured for structural, propellant, and clinical applications and also form spontaneously through the degradation of bulk boron compounds. Bulk boron is not toxic to vertebrates but the distinctive properties of its nanostructured equivalent may alter its biocompatibility. Few studies have addressed this possibility, thus our goal was to gain an initial understanding of the potential acute toxicity of nBO to freshwater fish and we used a variety of model systems to achieve this. Read More

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QTMP, a Novel Thiourea Polymer, Causes DNA Damage to Exert Anticancer Activity and Overcome Multidrug Resistance in Colorectal Cancer Cells.

Front Oncol 2021 28;11:667689. Epub 2021 May 28.

School of Life Science and Technology, China Pharmaceutical University, Nanjing, China.

Colorectal cancer (CRC) is one of the most common malignancies, and multidrug resistance (MDR) severely restricts the effectiveness of various anticancer drugs. Therefore, the development of novel anticancer drugs for the treatment of CRC patients with MDR is necessary. Quaternized thiourea main-chain polymer (QTMP) is a self-assembled nanoparticle with good water solubility. Read More

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Synthesis of silver nanoparticles conjugated with kaempferol and hydrocortisone and an evaluation of their antibacterial effects.

3 Biotech 2021 Jul 8;11(7):317. Epub 2021 Jun 8.

Department of Bio Nanotechnology, Gachon University, San 65, Bokjeong-Dong, Sujeong-Gu, Seongnam, Gyeonggi 461-701 Republic of Korea.

Silver nanoparticles (AgNPs) have shown a wide range of antibacterial activities over the last 2 decades. Conjugated AgNPs have attracted much interest among researchers for their properties which allow alterations of their physicochemical and biological properties. In this study, two potential stabilizing agents, flavonoids (kaempferol) and corticosteroids (hydrocortisone), were employed in the preparation of silver conjugated kaempferol and hydrocortisone nanoparticles (i. Read More

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Light-intensity switch enabled nonsynchronous growth of fluorinated raspberry-like nanoparticles.

Chem Sci 2020 Sep 10;11(38):10431-10436. Epub 2020 Sep 10.

State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University Shanghai 200433 China http://polymaolab.com/.

Raspberry-like (RB) nanoparticles hold potential for diverse applications due to their hierarchical morphology. Here we developed a novel tandem synthetic approach of nonsynchronous growth based on photo-mediated reversible-deactivation radical polymerization, enabling simple, efficient and bottom-up synthesis of RB nanoparticles of uniform sizes at quantitative conversions of fluorinated monomers. Chain transfer agents of different chain lengths, concentrations and chemical compositions were varied to tune the diameter of RB particles. Read More

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September 2020

Size-selective Pt siderophores based on redox active azo-aromatic ligands.

Chem Sci 2020 Aug 20;11(34):9226-9236. Epub 2020 Aug 20.

School of Chemical Sciences, Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India

We demonstrate a strategy inspired by natural siderophores for the dissolution of platinum nanoparticles that could enable their size-selective synthesis, toxicological assessment, and the recycling of this precious metal. From the fabrication of electronics to biomedical diagnosis and therapy, PtNPs find increasing use. Mitigating concerns over potential human toxicity and the need to recover precious metal from industrial debris motivates the study of bio-friendly reagents to replace traditional harsh etchants. Read More

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Free-standing metal-organic framework (MOF) monolayers by self-assembly of polymer-grafted nanoparticles.

Chem Sci 2020 Aug 3;11(32):8433-8437. Epub 2020 Aug 3.

Department of Chemistry and Biochemistry, University of California San Diego La Jolla California 92093 USA

We report a general method for the synthesis of free-standing, self-assembled MOF monolayers (SAMMs) at an air-water interface using polymer-brush coated MOF nanoparticles. UiO-66, UiO-66-NH, and MIL-88B-NH were functionalized with a catechol-bound chain-transfer agent (CTA) to graft poly(methyl methacrylate) (PMMA) from the surface of the MOF using reversible addition-fragmentation chain transfer polymerization (RAFT). The polymer-coated MOFs were self-assembled at the air-water interface into monolayer films ∼250 nm thick and capable of self-supporting at a total area of 40 mm. Read More

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Covalent grafting of molecular catalysts on CN H as robust, efficient and well-defined photocatalysts for solar fuel synthesis.

Chem Sci 2020 Jul 24;11(32):8425-8432. Epub 2020 Jul 24.

Department of Chemical Engineering UCL Torrington Place London WC1E 7JE UK

The covalent attachment of molecules to 2D materials is an emerging area as strong covalent chemistry offers new hybrid properties and greater mechanical stability compared with nanoparticles. A nickel bis-aminothiophenol catalyst was grafted onto a range of 2D carbon nitrides (CN H ) to form noble metal-free photocatalysts for H production. The hybrids produce H beyond 8 days with turnover numbers reaching 1360 based on nickel, a more than 3 fold higher durability than reported molecular catalyst-carbon nitride mixtures, and under longer wavelengths (>475 nm). Read More

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Gold and silver nanoparticles: Green synthesis, microbes, mechanism, factors, plant disease management and environmental risks.

Saudi J Biol Sci 2021 Jun 9;28(6):3624-3631. Epub 2021 Apr 9.

Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.

Metal nanoparticles were being used in different processes of developmental sectors like agriculture, industry, medical and pharmaceuticals. Nano-biotechnology along with sustainable organic chemistry has immense potential to reproduce innovative and key components of the systems to support surrounding environment, human health, and industry sustainably. Different unconventional methods were being used in green chemistry to synthesize gold and silver nanoparticles from various microbes. Read More

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