A facile metal-free “grafting-from” route from acrylamide-based substrate toward complex macromolecular combs

2013 ◽  
Vol 49 (63) ◽  
pp. 7079 ◽  
Author(s):  
Junpeng Zhao ◽  
Haleema Alamri ◽  
Nikos Hadjichristidis
Keyword(s):  
Metal Free ◽  
Free Grafting ◽  
Grafting From

Metal-free ATRP “grafting from” technique for renewable cellulose graft copolymers

2019 ◽  
Vol 21 (10) ◽  
pp. 2759-2770 ◽  
Author(s):  
Chuanwei Lu ◽  
Chunpeng Wang ◽  
Juan Yu ◽  
Jifu Wang ◽  
Fuxiang Chu
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Ethyl Cellulose ◽  
Graft Copolymers ◽  
Atom Transfer ◽  
Metal Free ◽  
Free Grafting ◽  
Grafting From

Photoinduced metal-free “grafting from” atom transfer radical polymerization (ATRP) has been successfully applied to the fabrication of renewable cellulose graft copolymers with the aid of 2-bromo-2-phenylacetyl ester-modified ethyl cellulose as the macroinitiator.

Cylindrical nanocapsules from photo-cross-linkable core–shell bottlebrush copolymers

2015 ◽  
Vol 6 (5) ◽  
pp. 764-771 ◽  
Author(s):  
Sebla Onbulak ◽  
Javid Rzayev
Keyword(s):  
Cross Linking ◽  
Core Shell ◽  
Metal Free ◽  
Grafting From

Coumarin-based, photo-cross-linkable core–shell bottlebrush copolymers were synthesized by a grafting-from approach. Hollow cylindrical nanocapsules were generated by selective, metal-free shell photo-cross-linking followed by hydrolytic core removal.

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.

Grafting-From Proteins Using Metal-Free PET–RAFT Polymerizations under Mild Visible-Light Irradiation

2017 ◽  
Vol 6 (4) ◽  
pp. 452-457 ◽  
Author(s):  
Bryan S. Tucker ◽  
McKenzie L. Coughlin ◽  
C. Adrian Figg ◽  
Brent S. Sumerlin
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Metal Free ◽  
Grafting From

The Shadow Widths of Very Small Particles are Formed Independently of the Metal Cap Build Up on the Particle

1981 ◽  
Vol 39 ◽  
pp. 568-569
Author(s):  
George C. Ruben
Keyword(s):  
Gold Particle ◽  
Film Surface ◽  
Small Particles ◽  
Geometric Process ◽  
Metal Free ◽  
Shadow Area

The formation of shadows behind small particles has been thought to be a geometric process (GP) where the metal cap build up on the particle creates a shadow width the same size as or larger than the particle. This GP cannot explain why gold particle shadow widths are generally larger than the gold particle and may have no appreciable metal cap build up (fig. 1). Ruben and Telford have suggested that particle shadow widths are formed by the width dependent deflection of shadow metal (SM) lateral to and infront of the particle. The trajectory of the deflected SM is determined by the incoming shadow angle (45°). Since there can be up to 1.4 times (at 45°) more SM directly striking the particle than the film surface, a ridge of metal nuclei lateral to and infront of the particle can be formed. This ridge in turn can prevent some SM from directly landing in the metal free shadow area. However, the SM that does land in the shadow area (not blocked by the particle or its ridge) does not stick and apparently surface migrates into the SM film behind the particle.

Recent advancement in the electrocatalytic synthesis of ammonia

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8065-8094 ◽  
Author(s):  
Xudong Wen ◽  
Jingqi Guan
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Single Atom ◽  
Metal Oxide Catalysts ◽  
Metal Free ◽  
Recent Advancement ◽  
Nanocomposite Catalysts

Different kinds of electrocatalysts used in NRR electrocatalysis (including single atom catalysts, metal oxide catalysts, nanocomposite catalysts, and metal free catalysts) are introduced.

Transition-metal-free catalytic hydroboration reduction of amides to amines

2020 ◽  
Vol 7 (21) ◽  
pp. 3515-3520
Author(s):  
Wubing Yao ◽  
Jiali Wang ◽  
Aiguo Zhong ◽  
Shiliang Wang ◽  
Yinlin Shao
Keyword(s):  
Transition Metal ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Value Added ◽  
Metal Free

The selective catalytic reduction of amides to value-added amine products is a desirable but challenging transformation.

Deaminative carbonylative thioesterification of activated alkylamines with thiophenols under transition-metal-free conditions

2021 ◽  
Author(s):  
Fengqian Zhao ◽  
Xiao-Feng Wu
Keyword(s):  
Free Radical ◽  
Transition Metal ◽  
Metal Free

A transition-metal-free radical carbonylation of activated alkylamines with thiophenols has been successfully developed. Various thioesters were selectively produced with moderate to good yields.

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