Hydrophobically Modified Silica-Coated Gold Nanorods for Generating Nonlinear Photoacoustic Signals

AbstractPristine hydrophilic silica aerogel nanoparticles surface was functionalized with hexamethyldisilazane (HMDS). Then, the resultant modified nanoparticles were used for

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Adsorption performance of hydrophobically modified silica gel for the vapors of n-hexane and water

Adsorption Science & Technology ◽

10.1177/0263617417728835 ◽

2017 ◽

Vol 36 (3-4) ◽

pp. 888-903 ◽

Cited By ~ 5

Author(s):

Weiqiu Huang ◽

Jixing Xu ◽

Bo Tang ◽

Hongning Wang ◽

Xiaobin Tan ◽

...

Keyword(s):

Silica Gel ◽

Orthogonal Experiment ◽

Raw Material ◽

Good Effect ◽

Modified Silica ◽

Modified Silica Gel ◽

Microwave Exposure ◽

Hexane Vapor ◽

Hydrophobically Modified ◽

The Difference

An ordinary silica gel (SG-1) was chosen as the raw material and hydrophobically modified with trimethylchlorosilane under different microwave exposure. The orthogonal experiment was designed to screen the optimized modification method. The hydrophobic properties modified silica gel (SG-2) was analyzed by comparing the difference changes of surface chemistries. Then, the adsorption capacities of SG-1 and SG-2 to the n-hexane vapor and water vapor, respectively, were investigated and compared with the capacities of activated carbon and SG-3 (hydrophobically modified using the same composite modifier without microwave exposure). Meanwhile, there cyclable adsorptions of SG-2 to the two vapors were conducted while the desorptions of vacuum and heat was observed. The results showed that the effect of hydrophobic modification to SG-1 under microwave exposure was obvious and SG-2 also had a very good effect of adsorption for the n-hexane vapor. The modified silica gel shows great potential and effect for the recovery of volatile organic compounds with high content of water.

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Gemini Surfactant Binding onto Hydrophobically Modified Silica Nanoparticles

The Journal of Physical Chemistry C ◽

10.1021/jp8026989 ◽

2008 ◽

Vol 112 (32) ◽

pp. 12142-12148 ◽

Cited By ~ 5

Author(s):

Patrizia Andreozzi ◽

Ramon Pons ◽

Lourdes Pérez ◽

Maria Rosa Infante ◽

Rita Muzzalupo ◽

...

Keyword(s):

Silica Nanoparticles ◽

Gemini Surfactant ◽

Modified Silica ◽

Hydrophobically Modified ◽

Modified Silica Nanoparticles

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Influence of Polymer Charge, Temperature, and Surfactants on Surface Sizing of Liner and Greaseproof Paper With Hydrophobically Modified Starch

TAPPI Journal ◽

10.32964/tj8.2.33 ◽

2009 ◽

Vol 8 (2) ◽

pp. 33-38 ◽

Cited By ~ 3

Author(s):

ANNA JONHED ◽

LARS JÄRNSTRÖM

Keyword(s):

Phase Separation ◽

Contact Angles ◽

Low Ph ◽

Hydrophobically Modified ◽

Paper Sizing ◽

Surface Sizing ◽

Separation Temperature ◽

Hydrophobic Nature ◽

Sizing Agents ◽

Charge Temperature

The aim of this study was to investigate the properties of hydrophobically modified (HM) quaterna-ry ammonium starch ethers for paper sizing. These starches possess temperature-responsive properties; that is, gelation or phase separation occurs at a certain temperature upon cooling. This insolubility of the HM starches in water at room temperature improved their performance as sizing agents. The contact angles for water on sized liner were substantially larger than on unsized liner. When the application temperature was well above the critical phase-separation temperature, larger contact angles were obtained for liner independently of pH compared with those at the lower application temperature. Cobb60 values for liner decreased upon surface sizing, with a low pH and high application temperature giving lower water penetration. Contact angles on greaseproof paper decreased upon sur-face sizing as compared to unsized greaseproof paper, independently of pH and temperature. Greaseproof paper showed no great difference between unsized substrates and substrates sized with HM starch at different pH. This is probably due to the already hydrophobic nature of greaseproof paper. However, the Cobb60 values increased at low pH and low application temperature. Surfactants were added to investigate how they affect the sized surface. Addition of surfactant reduces the contact angles, in spite of indications of complex formation.

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