scholarly journals Single-Step Metal-Free Grafting of Cationic Polymer Brushes on Fluorescent Nanodiamonds

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1479 ◽  
Author(s):  
Shingo Sotoma ◽  
Feng-Jen Hsieh ◽  
Huan-Cheng Chang
Keyword(s):  
Polymer Brushes ◽  
Cationic Polymer ◽  
Single Step ◽  
Cell Labeling ◽  
Cationic Polymers ◽  
Metal Free ◽  
Research Areas ◽  
Reversible Addition ◽  
Fluorescent Nanodiamonds ◽  
Free Grafting

Cationic polymers are often employed in conjugation with nanomaterials, and the resultant hybrids are useful for various bioapplications. Here, a single-step metal-free method for the synthesis of fluorescent nanodiamonds (FNDs) conjugated with cationic polymer brushes is reported. Distinct from the common methods such as atom transfer radical polymerization and reversible addition fragmentation chain transfer, our ring-opening-polymerization-based method is simple and less time consuming and hazardous. Infrared spectroscopy, thermogravimetric analysis, zeta potential, and dynamic light scattering confirmed the synthesis. The produced FND-polymer brushes showed markedly higher cell labeling and internalization efficiency without noticeable cytotoxicity. Our method is general and applicable to other nanoparticles as well for uses in diverse research areas.

Transition Metal-free Single Step Approach for Arylated Pyrazolopyrimidinones and Quinazolinones Using Benzylamines/Benzylalcohols/Benzaldehydes

2017 ◽  
Vol 2 (17) ◽  
pp. 4963-4968 ◽  
Author(s):  
Abhinandan D. Hudwekar ◽  
G. Lakshma Reddy ◽  
Praveen K. Verma ◽  
Sorav Gupta ◽  
Ram A. Vishwakarma ◽  
...  
Keyword(s):  
Transition Metal ◽  
Single Step ◽  
Metal Free

scholarly journals Efficient metal-free strategies for polymerization of a sterically hindered ionic monomer through the application of hard confinement and high pressure

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 6396-6408 ◽  
Author(s):  
Paulina Maksym ◽  
Magdalena Tarnacka ◽  
Andrzej Dzienia ◽  
Kamila Wolnica ◽  
Mateusz Dulski ◽  
...  
Keyword(s):  
High Pressure ◽  
Free Radical ◽  
Chain Transfer ◽  
Metal Free ◽  
Reversible Addition ◽  
Ionic Monomer ◽  
Sterically Hindered

The effect of hard confinement and high pressure on the progress of free-radical and reversible addition-fragmentation chain transfer polymerizations of sterically hindered 1-octyl-3-vinylimidazolium bis(trifluoromethanesulfonyl)imide ([OVIM][NTf2]) has been investigated.

scholarly journals 2D laser lithography on silicon substrates via photoinduced copper-mediated radical polymerization

2018 ◽  
Vol 54 (7) ◽  
pp. 751-754 ◽  
Author(s):  
Joachim Laun ◽  
Yana De Smet ◽  
Emma Van de Reydt ◽  
Alexander Krivcov ◽  
Vanessa Trouillet ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Polymer Brushes ◽  
Single Step ◽  
Silicon Substrates ◽  
Laser Lithography

A 2D laser lithography protocol for controlled grafting of polymer brushes in a single-step is presented.

scholarly journals Highly Stable RNA Capture by Dense Cationic Polymer Brushes for the Design of Cytocompatible, Serum-Stable SiRNA Delivery Vectors

2018 ◽  
Vol 19 (2) ◽  
pp. 606-615 ◽  
Author(s):  
Danyang Li ◽  
Amir S. Sharili ◽  
John Connelly ◽  
Julien E. Gautrot
Keyword(s):  
Polymer Brushes ◽  
Sirna Delivery ◽  
Cationic Polymer

scholarly journals Accessible and sustainable Cu(0)-mediated radical polymerisation for the functionalisation of surfaces

2020 ◽  
Vol 11 (23) ◽  
pp. 3831-3840
Author(s):  
Oliver Frank Uttley ◽  
Leonie Alice Brummitt ◽  
Stephen David Worrall ◽  
Steve Edmondson
Keyword(s):  
Polymer Brushes ◽  
Cationic Polymer ◽  
Environmentally Benign ◽  
Controlled Growth ◽  
Ambient Conditions ◽  
Radical Polymerisation ◽  
Benign Solvents ◽  
Surface Functionalisation

Towards use of environmentally benign solvents and ambient conditions for surface functionalisation by controlled growth of thick cationic polymer brushes.

Transition-Metal-Free, Intermolecular Azidoheteroarylation of Alkenes: Efficient Access to β-Azidoalkylated Quinoxalinones and Preliminary Antifungal Evaluation Against Magnaporthe grisea

Synthesis ◽  
2020 ◽  
Vol 52 (16) ◽  
pp. 2395-2409
Author(s):  
Weiwei Qin ◽  
Zhaodong Li ◽  
Yiming Du ◽  
Yue Chen ◽  
Yun-Lin Liu
Keyword(s):  
Transition Metal ◽  
Magnaporthe Grisea ◽  
Single Step ◽  
Domino Reaction ◽  
Efficient Synthesis ◽  
Metal Free ◽  
Efficient Access ◽  
First Time ◽  
Antibacterial Evaluation ◽  
Addition Pathway

An efficient, PhI(OAc)2-mediated, radical azidoheteroarylation of alkenes under transition-metal-free conditions is reported by employing TMSN3 and quinoxalin-2(1H)-ones as coupling partners. This domino reaction allows an efficient synthesis of valuable orangoazides containing quinoxalin-2(1H)-one derivatives and could be extended to phosphinyl-alkylated quinoxalin-2(1H)-one in a single step in moderate to excellent yields under mild conditions, as demonstrated by the preliminary antibacterial evaluation against Magnaporthe grisea for the first time. Mechanistic studies revealed that this transformation undergoes a cascade addition pathway controlled by a polar radical.

scholarly journals Antibacterial Activity of Tannic Acid and Tannic Acid/Amphiphilic Cationic Polymer Mixtures

2020 ◽  
Vol 32 (6) ◽  
pp. 1491-1496
Author(s):  
Fatimah M. Alzahrani ◽  
Stephen G. Yeates ◽  
Michelle Webb ◽  
Hind Ali Alghamdi
Keyword(s):  
Antibacterial Activity ◽  
Tannic Acid ◽  
Cationic Polymer ◽  
Polymer Mixture ◽  
Klebsiella Pneumonia ◽  
Cationic Polymers ◽  
Polymer Mixtures ◽  
Bacterial Strains ◽  
Gram Positive ◽  
E Coli

In this study, the antibacterial activity of tannic acid/amphiphilic cationic polymer (poly{2-[(methacryloyloxy)ethyl]trimethyl-ammonium chloride}, PMADQUAT) and tannic acid mixtures was examined on the strains of Gram-positive (S. aureus) and Gram-negative (E. coli CI2, E. coli K12, Klebsiella pneumonia and P. aeruginosa) bacteria. Tannic acid exhibited the antibacterial activity against all the studied bacterial strains. The ester linkage between glucose and gallic acid is vital for the antimicrobial activity of tannic acid. Tannic acid inhibited the growth of S. aureus and E. coli K12 (1 wt%) and reduced the growth of P. aeruginosa to 23%. Mixing cationic polymers having different structures (statistical copolymer, homopolymer and diblock polymer) with tannic acid lead to an increase in antibacterial activity of tannic acid and the stability and clarity of mixtures was higher than that of a pure tannic acid solution. Tannic acid/diblock polymer and tannic acid/homopolymer mixtures (0.1 wt%) were excellent for inhibiting the growth of planktonic E. coli K12 bacteria, and a low concentration (0.0001 wt%) of tannic acid/diblock polymer reduced its growth to 19%. By contrast, the tannic acid/statistical polymer mixture (0.0001 wt%) was excellent for inhibiting the growth of Gram-positive S. aureus bacteria.

scholarly journals Glance into solid-state transformer technology: a mirror for possible research areas

2020 ◽  
Vol 2 (1) ◽  
pp. 1-13
Author(s):  
Bashir Musa Umar ◽  
Yusuf Jibril ◽  
Boyi Jimoh ◽  
Abdullahi Bala Kunya ◽  
Yusuf Abubakar Maiwada ◽  
...  
Keyword(s):  
Solid State ◽  
Power Electronics ◽  
Power Distribution ◽  
Low Frequency ◽  
Single Step ◽  
Electric Power System ◽  
Energy Integration ◽  
Solid State Transformer ◽  
Research Areas ◽  
Research Activities

Solid-State Transformer (SST), a power electronics based transformer is an emerging technology in electric power system. The transformer is being investigated to completely replace existing Line/Low Frequency Transformer (LFT). SST is composed of either of the two topologies: AC-DC-AC, two steps approach; or AC-AC, single-step approach. The two steps approach consists of three stages: AC-DC; DC-DC; and DC-AC stages. The DC-DC stage is made up of a boost DC-DC converter, a DC-AC inverter and a High Frequency Transformer, HFT. Therefore, SST performs the tasks of LFT by means of power electronic converters and HFT.  The main essence of SST is to provide solution to the problem of bulkiness and heaviness of the LFT in the power distribution network. This is with the view to providing reduction in construction cost, cost of maintenance and transportation. The power electronics transformer provides numerous advantages which are grouped into: The transformer has high power density; it functions in blackouts and brownouts; and it provides easy means of distributed renewable energy integration into associated grid. Therefore, this paper provides a glance into the technology of the SST for its better understating and promotion of research activities in the area.

Cationic polymer-based plasmonic sensor array that discriminates proteins

The Analyst ◽  
2018 ◽  
Vol 143 (22) ◽  
pp. 5578-5582 ◽  
Author(s):  
Hongyan Xi ◽  
Xin Li ◽  
Qingyun Liu ◽  
Zhengbo Chen
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Sensor Array ◽  
Colorimetric Sensor ◽  
Cationic Polymer ◽  
Cationic Polymers ◽  
Sensing Element ◽  
Plasmonic Sensor ◽  
Colorimetric Sensor Array ◽  
Dimethylammonium Chloride

Breaking the restrictions of the lock-and-key sensing strategy which relies only on the most dominant interactions between the sensing element and target, here, we develop a colorimetric sensor array with three kinds of cationic polymers (polydiallyl dimethylammonium chloride (PDDA), chitosan (CTS), and cetyltrimethylammonium bromide (CTAB)) as nonspecific receptors.

Removal of Viruses from Tapwater by Fiberglass Filters Modified with a Combination of Cationic Polymers

1989 ◽  
Vol 21 (3) ◽  
pp. 93-98
Author(s):  
D. R. Preston ◽  
S. R. Farrah ◽  
G. Bitton
Keyword(s):  
Tap Water ◽  
Cationic Polymer ◽  
Cationic Polymers ◽  
Poliovirus Type ◽  
Echovirus Type

This paper describes the development of an inexpensive electropositive filter capable of adsorbing enteroviruses from waters at pH 5 to 9. We have previously reported that electronegative microporous filters composed of epoxy-fiberglass (Filterite) treated with the cationic polymers polyethylenimine (PEI) and Nalco 7111 cationic polymer (Nalco) were found to adsorb a greater percentage of enteroviruses and indigenous bacteriophages from water than untreated filters (Preston etal. 1988). However, no single polymer treated filter was capable of adsorbing poliovirus type 1 from buffer pH 5, 7, and 9. When PEI and Nalco 7111 cationic polymer treated filters were combined as a series of different filters or on the same filter, Poliovirus-1 was subsequently removed from buffer at pH 5, 7, and 9. Filterite filters modified with a combination of PEI and Nalco polymers were found to adsorb echovirus type 1, echovirus type 5, coxsackievirus type B5, and poliovirus type 1 from tap water at least as well as Virasorb 1-MDS microporous filters.

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