The Critical Impacts of Ligands on Heterogeneous Nanocatalysis: A Review DOI
Linfang Lu, Shihui Zou, Baizeng Fang

et al.

ACS Catalysis, Journal Year: 2021, Volume and Issue: 11(10), P. 6020 - 6058

Published: May 4, 2021

Ligand utilization is a necessary and powerful technique for the colloidal synthesis of nanoparticles (NPs) with controllable sizes regulated morphologies. For catalysis applications, it commonly believed that surface ligands on metal NPs block active catalytic sites reduce activity. Nevertheless, since 2010, an increasing number research groups have demonstrated unexpected benefits improve activity and/or selectivity. These can be ascribed to construction inorganic–organic interface, through which series factors, such as steric, electronic, solubility effects, utilized produce favorable changes interfacial environment. Considering tremendous developments in this emerging field, compile comprehensive systematic overview recent advances. In Review, we summarize critical impacts heterogeneous nanocatalysis. First, introduce vital roles colloid syntheses shapes. Second, detrimental effects nanocatalysis are described basis traditional views. Third, strategies ligand removal reviewed compared. Fourth, has been conducted past decade, three main beneficial (steric, solubility) classified discussed. each effect, possible corresponding mechanism presented, typical examples provided. Recent advances regarding density functional theory (DFT) calculations regulation coverage dedicated explaining ligand-promotion searching optimal nanocatalysts. Fifth, stabilities cutting-edge ligand-capped nanocatalysts before after reactions Finally, highlight remaining challenges propose future perspectives. Although much progress achieved, activities multifaceted still debatable. We hope Review will deepen readers' understanding actual catalysis.

Language: Английский

Plant-mediated synthesis of silver nanoparticles using fruit extract of Cleome viscosa L.: Assessment of their antibacterial and anticancer activity DOI Creative Commons
G. Lakshmanan, Anbazhagan Sathiyaseelan,

Kalaichelvan P.T.

et al.

Karbala International Journal of Modern Science, Journal Year: 2017, Volume and Issue: 4(1), P. 61 - 68

Published: Dec. 1, 2017

Green synthesis of silver nanoparticles was successfully done using Cleome viscosa plant extract, simple, rapid, eco-friendly and a cheaper method. In this study, we used C. extract for synthesizing which reduces nitrate into ions. The obtained AgNPs were characterized by UV, FTIR, XRD, FESEM-EDAX TEM analysis. They also analyzed their biological activities. presence biosynthesized (410–430 nm) confirmed UV–visible spectroscopy crystal nature through XRD analysis; FT-IR spectrum to confirm the different functional groups in biomolecules act as capping agent nanoparticles. morphology SEM elemental size range 20–50 nm determined TEM. green synthesized exhibited good antibacterial activity against both Gram negative positive bacteria. Furthermore, showed reliable anticancer on lung (A549) ovarian (PA1) cancer cell lines.

Language: Английский

Citations

273
Synthesis and Characterization of Biodegradable Lignin Nanoparticles with Tunable Surface Properties DOI

Alexander P. Richter,

Bhuvnesh Bharti,

Hinton B. Armstrong

et al.

Langmuir, Journal Year: 2016, Volume and Issue: 32(25), P. 6468 - 6477

Published: June 6, 2016

Lignin nanoparticles can serve as biodegradable carriers of biocidal actives with minimal environmental footprint. Here we describe the colloidal synthesis and interfacial design tunable surface properties using two different lignin precursors, Kraft (Indulin AT) Organosolv (high-purity lignin). The green process is based on flash precipitation dissolved polymer, which enabled formation in size range 45-250 nm. evolution types particles fitted basis modified diffusive growth kinetics mass balance dependencies. are fine-tuned by coating them a cationic polyelectrolyte, poly(diallyldimethylammonium chloride). We analyze how stability dispersion these vary function pH salinities. data show that governed type used presence polyelectrolyte coating. allows control nanoparticles' charge extension their into strongly basic regimes, facilitating potential application at extreme conditions.

Language: Английский

Citations

272
Environmentally benign synthesis of phytochemicals-capped gold nanoparticles as nanopriming agent for promoting maize seed germination DOI
Wuttipong Mahakham, Piyada Theerakulpisut, Santi Maensiri

et al.

The Science of The Total Environment, Journal Year: 2016, Volume and Issue: 573, P. 1089 - 1102

Published: Sept. 16, 2016

Language: Английский

Citations

269
Intermetallic Nanoparticles: Synthetic Control and Their Enhanced Electrocatalysis DOI
Junrui Li, Shouheng Sun

Accounts of Chemical Research, Journal Year: 2019, Volume and Issue: 52(7), P. 2015 - 2025

Published: June 28, 2019

Intermetallic nanoparticles (NPs) described in this Account are a class of metallic alloy NPs within which metal atoms bonded via strong d-orbital interaction and ordered anisotropically specific crystallographic direction. Compared to the common with solid solution structure, intermetallic generally more stable against chemical oxidation etching. The strict stoichiometry requirement, well-defined atom binding environment layered atomic arrangement also make an ideal model for understanding their physical catalytic properties. This account summarizes synthetic principles strategies developed obtain monodisperse NPs, especially tetragonal L10-NPs. thermodynamics kinetics involved conversion between disordered structures briefly discussed. methods grouped into two slightly different categories: solution-phase synthesis followed by state annealing direct synthesis. In former method, high-surface-area supports often needed disperse prevent them from aggregation, while latter method such not required since structure temperature is lowered level that can proceed reaction condition. any these approaches, various factors influencing formation should be carefully controlled ensure complete structural transition NPs. Using representative examples, we highlight explored facilitate including introduction vacancies/defects NP control addition rate/seed-mediated diffusion lower energy barrier. These illustrate how concept used design Additionally, correlate catalysis, introduce d-band theory explain electronic, strain ensemble effects tune catalysis. We focus specifically on Pt-, Pd-, Au-based L10-NPs demonstrate could prepared show much enhanced catalysis electrochemical reactions, oxygen reduction (ORR), hydrogen evolution (HER), formic acid (FAOR), thermo-oxidation CO. Due stability "sandwich"-type roles first-row better understood achieve optimization. extended other demonstrating great potentials using important applications.

Language: Английский

Citations

267
The Critical Impacts of Ligands on Heterogeneous Nanocatalysis: A Review DOI
Linfang Lu, Shihui Zou, Baizeng Fang

et al.

ACS Catalysis, Journal Year: 2021, Volume and Issue: 11(10), P. 6020 - 6058

Published: May 4, 2021

Ligand utilization is a necessary and powerful technique for the colloidal synthesis of nanoparticles (NPs) with controllable sizes regulated morphologies. For catalysis applications, it commonly believed that surface ligands on metal NPs block active catalytic sites reduce activity. Nevertheless, since 2010, an increasing number research groups have demonstrated unexpected benefits improve activity and/or selectivity. These can be ascribed to construction inorganic–organic interface, through which series factors, such as steric, electronic, solubility effects, utilized produce favorable changes interfacial environment. Considering tremendous developments in this emerging field, compile comprehensive systematic overview recent advances. In Review, we summarize critical impacts heterogeneous nanocatalysis. First, introduce vital roles colloid syntheses shapes. Second, detrimental effects nanocatalysis are described basis traditional views. Third, strategies ligand removal reviewed compared. Fourth, has been conducted past decade, three main beneficial (steric, solubility) classified discussed. each effect, possible corresponding mechanism presented, typical examples provided. Recent advances regarding density functional theory (DFT) calculations regulation coverage dedicated explaining ligand-promotion searching optimal nanocatalysts. Fifth, stabilities cutting-edge ligand-capped nanocatalysts before after reactions Finally, highlight remaining challenges propose future perspectives. Although much progress achieved, activities multifaceted still debatable. We hope Review will deepen readers' understanding actual catalysis.

Language: Английский

Citations

254