Stimuli-responsive Janus mesoporous nanosheets towards robust interfacial emulsification and catalysis

2020 ◽  
Vol 7 (12) ◽  
pp. 3242-3249
Author(s):  
Jiangyan Yang ◽  
Jialin Wang ◽  
Yijiang Liu ◽  
Huaming Li ◽  
Zhiqun Lin
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Stimuli Responsive ◽  
Phase Type

Stimuli-responsive amphiphilic Janus mesoporous nanosheets with pH-triggered emulsification performance, switchable catalytic activity in aqueous solution and oil-phase-type-dependent catalytic activity at an emulsion interface were crafted.

Decomposition of hydrogen peroxide on a two-component NiO-CdO catalyst and the effect of ionizing radiation on its catalytic properties

1979 ◽  
Vol 44 (4) ◽  
pp. 1015-1022 ◽  
Author(s):  
Viliam Múčka
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Nickel Oxide ◽  
Catalytic Properties ◽  
Cadmium Oxide ◽  
Chemisorb Oxygen ◽  
Composition Region ◽  
Chemisorbed Oxygen ◽  
Two Component

The catalytic properties of two-component catalyst nickel oxide-cadmium oxide with the proportions of the components covering the whole composition region 0-100% were examined by studying the decomposition of hydrogen peroxide in aqueous solution on it. In the range 0-25 mol.% CdO, cadmium oxide is found to affect infavourably the ability of nickel oxide to chemisorb oxygen. The amount of the chemisorbed oxygen increases several times on gamma irradiation of the samples. The effect of cadmium oxide on the catalytic activity of the system shows up in fresh samples only indirectly via the changed amount of the oxygen chemisorbed. In older samples the initial catalytic activity of the system is changed, which can be explained based on the concept of bivalent catalytic centres in terms of the co-action of the catalytic centres of the two oxides, which are in equilibrium. The irradiation of the system under study speeds up the processes leading to the establishing of this equilibrium which is thermally very stable, and results in a substantial increase of the catalytic activity of the samples investigated.

Stimuli-Responsive Supramolecular Chirality Switching and Nanoassembly Constructed by n-Shaped Amphiphilic Molecules in Aqueous Solution

Langmuir ◽  
2021 ◽  
Vol 37 (3) ◽  
pp. 1215-1224
Author(s):  
Yuntian Yang ◽  
Qingqing Han ◽  
Yi-rong Pei ◽  
Shengsheng Yu ◽  
Zhegang Huang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Stimuli Responsive ◽  
Supramolecular Chirality ◽  
Amphiphilic Molecules

scholarly journals Synthesis and pH-stimuli responsive research of gemini amine-oxide surfactants containing amides

RSC Advances ◽  
2020 ◽  
Vol 10 (72) ◽  
pp. 44387-44396
Author(s):  
Hanyu Chen ◽  
Duojiao Fu ◽  
Xiqin Zhou ◽  
Hongqin Liu ◽  
Baocai Xu
Keyword(s):  
Aqueous Solution ◽  
Amine Oxide ◽  
Stimuli Responsive ◽  
Responsive Behavior

The series of gemini amine-oxide surfactants with the formula CnH2n+1CONH(CH2)2N+O–(CH3)–(CH2)3–(CH3)N+O– (CH2)2NHCOCnH2n+1 (n = 11, 13, 15, and 17) have been synthesized, and their pH-stimuli responsive behavior in aqueous solution has been studied.

scholarly journals A Supramolecular Heat-Pump: an Electrochemical Cooling System Utilizing the Enthalpy Change of a Host–Guest Interaction

2021 ◽  
Author(s):  
Fumitoshi Matoba ◽  
Teppei Yamada ◽  
Nobuo Kimizuka
Keyword(s):  
Aqueous Solution ◽  
Heat Pump ◽  
Cooling System ◽  
Enthalpy Change ◽  
Cathode Side ◽  
Peltier Effect ◽  
Supramolecular Interaction ◽  
Anode Side ◽  
Stimuli Responsive ◽  
Redox Active

Abstract Redox-stimulated host–guest chemistry was applied for the electrochemical Peltier effect, which is a heat transportation phenomenon observed in redox-active electrolytes. The refrigeration capability was enhanced up to 70%. By the addition of alpha-Cyclodextrin (α-CD) into I−/I3− aqueous solution, the amount of heat transported from the cathode side to the anode side was observed. The enhancement of the heat transportation was derived from the elimination heat of I3− from α-CD associated with the shift of host–guest equilibrium caused by the exhausting of I3− by the reduction. This is the first report that utilized the stimuli-responsive supramolecular interaction for heat transportation.

scholarly journals AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 963
Author(s):  
Wei Liu ◽  
Xiaolian Zhu ◽  
Chengcheng Xu ◽  
Zhao Dai ◽  
Zhaohui Meng
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Phase Transformation ◽  
Catalytic Activity ◽  
Catalytic Efficiency ◽  
Environmental Pollutant ◽  
Temperature Sensitive ◽  
Efficient Catalyst ◽  
Catalytic Rate ◽  
Silica Core

A new AuNPs-based thermosensitive nanoreactor (SiO2@PMBA@Au@PNIPAM) was designed and prepared by stabilizing AuNPs in the layer of poly(N,N’-methylenebisacrylamide) (PMBA) and subsequent wrapping with the temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) layer. The new nanoreactor exhibited high dispersibility and stability in aqueous solution and effectively prevented the aggregation of AuNPs caused by the phase transformation of PNIPAM. The XPS and ATR-FTIR results indicated that AuNPs could be well stabilized by PMBA due to the electron transfer between the N atoms of amide groups in the PMBA and Au atoms of AuNPs. The catalytic activity and thermoresponsive property of the new nanoreactor were invested by the reduction of the environmental pollutant, 4-nitrophenol (4-NP), with NaBH4 as a reductant. It exhibited a higher catalytic activity at 20 °C and 30 °C (below LCST of PNIPAM), but an inhibited catalytic activity at 40 °C (above LCST of PNIPAM). The PNIPAM layer played a switching role in controlling the catalytic rate by altering the reaction temperature. In addition, this nanoreactor showed an easily recyclable property due to the existence of a silica core and also preserved a rather high catalytic efficiency after 16 times of recycling.

scholarly journals Multi-Electron-Transfer Catalysts Needed for Artificial Photosynthesis

2012 ◽  
Vol 1387 ◽  
Author(s):  
James Vickers ◽  
Hongjin Lv ◽  
Petro F. Zhuk ◽  
Yurii V. Geletii ◽  
Craig L. Hill
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Electron Transfer ◽  
Catalytic Activity ◽  
Induction Period ◽  
Water Oxidation ◽  
Fuel Production ◽  
Oxygen Ligand ◽  
Visible Light Driven ◽  
Simple Kinetic Model

ABSTRACTWe report a study on catalytic water oxidation by cobalt in oxygen ligand environments because such systems are as promising as any in the water oxidation component of solar fuel production. We have re-examined the catalytic activity of Co(II) in aqueous solution using either [Ru(bpy)3]3+ as a stoichiometric oxidant or in visible-light-driven reactions with persulfate as a sacrificial electron acceptor. In both systems a distinctive induction period is observed. A simple kinetic model is proposed that describes the experimental data well. The presence of an induction period is explained by relatively slow formation of the true catalyst from aquacobalt(II).

Multi-stimuli-responsive supramolecular gel constructed by pillar[5]arene-based pseudorotaxanes for efficient detection and separation of multi-analytes in aqueous solution

Soft Matter ◽  
2018 ◽  
Vol 14 (42) ◽  
pp. 8529-8536 ◽  
Author(s):  
You-Ming Zhang ◽  
Yong-Fu Li ◽  
Hu Fang ◽  
Jun-Xia He ◽  
Bi-Rong Yong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Polymer Network ◽  
Water Soluble ◽  
Supramolecular Polymer ◽  
Stimuli Responsive ◽  
Supramolecular Gel ◽  
Efficient Detection ◽  
Detection And Separation

A novel pseudorotaxanes-type crosslinker of a supramolecular polymer network (WP5-PN) was constructed based on water-soluble pillar[5]arene (WP5) and naphthalene dimethylamine derivative (PN) via host-guest interactions.

scholarly journals Annihilation of the Catalytic Activity in Butene Isomerization of Porous Vycor Glass by Washing with EDTA Aqueous Solution

1977 ◽  
Vol 50 (12) ◽  
pp. 3411-3412 ◽  
Author(s):  
Shoji Hirai ◽  
Akira Morikawa ◽  
Yoshio Ishinaga ◽  
Kiyoshi Otsuka ◽  
Yuji Wada
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Vycor Glass ◽  
Porous Vycor Glass ◽  
Butene Isomerization
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