Preparation of cyclohexanone/water Pickering emulsion together with modification of silica particles in the presence of PMHS by one pot method

Wu, Wei; Chen, Hongling; Liu, Chang; Wen, Yanjia; Yuan, Yongbing; Zhang, Yu

doi:10.1016/j.colsurfa.2014.02.023

Cited by 8 publications

(7 citation statements)

References 42 publications

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“…This field received widespread scientific interests for developing stable Pickering emulsions/foam [2][3][4], double emulsions [5][6][7][8], liquid marbles, and superhydrophobic barriers [9,10]. As nanomanufacturing processes are getting mature and well-controlled, more and more nanomaterials are adopted as the stabilizers for Pickering emulsions, such as functionalized silica, titania nanoparticles, zirconium phosphate, protein microgel, clay, and polymer particles [11][12][13][14][15][16][17][18][19][20][21]. However, most procedures are still relatively complicated and require costly reagents for synthesizing the amphiphilic nanoparticles with desired properties, resulting in limited applications.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of Amphiphilic Luminescent Graphene Quantum Dot and Its Application in Miniemulsion Polymerization

Zeng

Wang

et al. 2016

Journal of Nanomaterials

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Although emulsion applications of microscale graphene sheets have attracted much attention recently, nanoscale graphene platelets, namely, graphene quantum dots (GQDs), have been rarely explored in interface science. In this work, we study the interfacial behaviors and emulsion phase diagrams of hydrophobic-functionalized graphene quantum dots (C18-GQDs). Distinctive from pristine graphene quantum dots (p-GQDs), C18-GQDs show several interesting surface-active properties including high emulsification efficiency in stabilizing dodecane-in-water emulsions. We then utilize the C18-GQDs as surfactants in miniemulsion polymerization of styrene, achieving uniform and relatively small polystyrene nanospheres. The high emulsification efficiency, low production cost, uniform morphology, intriguing photoluminescence, and extraordinary stability render C18-GQDs an attractive alternative in surfactant applications.

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Section: Introductionmentioning

confidence: 99%

The Synthesis of Amphiphilic Luminescent Graphene Quantum Dot and Its Application in Miniemulsion Polymerization

Zeng

Wang

et al. 2016

Journal of Nanomaterials

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“…In addition, the grafting by the covalent bonds is confirmed by 29 Si CPMAS NMR, where peaks at −35.6, −57.5, and 65.4 ppm are observed in addition to the Q 3 and Q 4 peaks of the silica monolith between −90 and −120 ppm. The major peak at 35.6 ppm corresponds to CH 3 Si(OSi) 2 H (D 2 H) from the grafted PMHS and the peak at −57.5 ppm to CH 3 Si(OSi) 2 OH groups (D 2 OH) derived from the hydrolysis of the Si–H in D 2 H. The peak at −65.4 ppm corresponds to CH 3 Si(OSi) 3 (T 3 ) formed by the grafting reaction on the surface of the monolith. , …”

Section: Resultsmentioning

confidence: 99%

Grafted Polymethylhydrosiloxane on Hierarchically Porous Silica Monoliths: A New Path to Monolith-Supported Palladium Nanoparticles for Continuous Flow Catalysis Applications

Pélisson

Nakanishi

Zhu

et al. 2016

ACS Appl. Mater. Interfaces

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Polymethylhydrosiloxane has been grafted on the surface of a hierarchically porous silica monolith using a facile catalytic reaction between Si-H and silanol to anchor the polymer. This easy methodology leads to the functionalization of the surface of a silica monolith, where a large amount of free Si-H bonds remain available for reducing metal ions in solution. Palladium nanoparticles of 15 nm have been synthesized homogeneously inside the mesopores of the monolith without any stabilizers, using a flow of a solution containing Pd. This monolith was used as column-type fixed bed catalyst for continuous flow hydrogenation of styrene and selective hydrogenation of 3-hexyn-1-ol, in each case without a significant decrease of the catalytic activity after several hours or days. Conversion, selectivity, and stereoselectivity of the alkyne hydrogenation can be tuned by flow rates of hydrogen and the substrate solution, leading to high productivity (1.57 mol g(Pd) h) of the corresponding cis-alkene.

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“…Regarding the thermal stability of PMHS, thermogravimetric study showed that the continuous weight loss of this chemical occurred at temperatures, ranging from 160 to 340 • C. At over 340 • C, a considerable loss of weight was due to thermal decomposition of backbone Si-O-Si linkages [34,35]. Thus, PMHS appears to possess a good thermal stability, but there is no information available for its hydrothermal stability in alkali environments at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Lightweight Cement with Thermal Shock Resistance and Thermal Insulating Properties for Energy-Storage Geothermal Well Systems

Sugama¹,

Pyatina²

2021

Materials

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This study assessed the possibility of using polymethylhydrosiloxane (PMHS)-treated fly ash cenospheres (FCS) for formulating a thermally insulating and thermal shock (TS)-resistant cementitious blend with calcium aluminate cement. To prevent FCS degradation in an alkaline cement environment at high temperatures, the cenospheres were pre-treated with sodium metasilicate to form silanol and aluminol groups on their surface. These groups participated in a dehydrogenation reaction with the functional ≡Si–H groups within PMHS with the formation of siloxane oxygen-linked M-FCS (M: Al or Si). At high hydrothermal temperatures of 175 and 250 °C, some Si–O–Si and SiCH3 bonds ruptured, causing depolymerization of the polymer at the FCS surface and hydroxylation of the raptured sites with the formation of silanol groups. Repolymerization through self-condensation between the silanol groups followed, resulting in the transformation of siloxane to low crosslinked silicon-like polymer as a repolymerization-induced product (RIP) without carbon. The RIP provided adequate protection of FCS from pozzolanic reactions (PR), which was confirmed by the decline in zeolites as the products of PR of FCS. Cements with PMHS-treated FCS withstood both hydrothermal and thermal temperature of 250 °C in TS tests, and they also showed improved compressive strength, toughness, and water repellency as well as decreased thermal conductivity. The lubricating properties of PMHS increased the fluidity of lightweight slurries.

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Preparation of cyclohexanone/water Pickering emulsion together with modification of silica particles in the presence of PMHS by one pot method

Cited by 8 publications

References 42 publications

The Synthesis of Amphiphilic Luminescent Graphene Quantum Dot and Its Application in Miniemulsion Polymerization

The Synthesis of Amphiphilic Luminescent Graphene Quantum Dot and Its Application in Miniemulsion Polymerization

Grafted Polymethylhydrosiloxane on Hierarchically Porous Silica Monoliths: A New Path to Monolith-Supported Palladium Nanoparticles for Continuous Flow Catalysis Applications

Hydrophobic Lightweight Cement with Thermal Shock Resistance and Thermal Insulating Properties for Energy-Storage Geothermal Well Systems

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