Oil Absorption & Sustained Release

Weaknesses of the existing sustained release materials
                                            

At present, sustained release is used in many applications, generally in perfumes and mosquito and insect repellents, but with the following limitations:

◆ Small amount of oil absorption.

◆ Short period (hours to few days) of release.

◆ Non-uniform release over time.

◆ The essential oils are fixed in the tablets when manufactured and cannot be added or changed for personal preferences.

◆ Generally, the flexible foams or cotton are used but the essential oil tends to spill out when pressed, causing oil leak and contact with skins.



Advantages of our mesoporous release materials
                                            

◆ Ultra high oil absorption. (up to 90% volume of oil absorption).

◆ Uniform sustained release as long as 40 days.

◆ Optimization of the production process significantly improves the cost performance of products.



Scientific Principles
                                            

 Our nano-mesoporous aerogel has superior features of high surface area, high porosity, light weight, low thermal conductivity, high energy absorption, low water absorption, strong adsorption capacity,  sustained release of liquid, etc.

There is a broad prospect of application in environmental protection, aerospace, electronics, pharmacy, building materials, metallurgy, among many others.

Electron Microscopy Images of our Nano-materials.

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Inside the 0.08 density materials, there are porous structures composed of nano-fibers.
Inside the 0.16 density materials, there are porous structures composed of majority nano-fibers and small amount of nano-particles.
Inside the 0.25 density materials, there are porous structures composed of mainly nano-particle cluster groups.



Technical Specification

                                            

Mesoporous

Pore size: 5nm - 10 μm

High surface area

Surface area: 10m2/g-500m2/g

Low Density

Density: 8kg/m3-300kg/m3

Low thermal conductivity

Thermal Coefficient: 0.018-0.060w/mk 

Mesoporous

Porosity:70-99.9%

High energy absorption

Energy absorption:50-300 J/g

Low water absorption

Water absorption:<5%

Strong adsorption

Oil adsorption: 5-15 times by weight



Hydrophobic waterproof property

                                            

Nano-materials, with high hydrophobic features, have strong adsorption capability of oil fluids

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Strong Oil-Absorption Ability

                                            

Nano-materials with high hydrophobic surfaces has strong adsorption ability of oil fluids

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Image of Experiment on 0.16 Nano-Materials Absorbing Machine Oil: The disc completed adsorption in 150 seconds.

0.7g of materials absorbed 5.4 g of machine oil, an oil absorption ratio of 8 times.

88% of the volume inside the nano-materials is filled with machine oil.

In contrast, they absorb only 2% of water content in one week.

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Experiment data for 0.08 and 0.25 nano-materials to absorb anti-mosquito essential oil. 
Absorption can reach saturation within 2 minutes. 

The low density materials can absorb anti-mosquito essential oil 10 times of its own weight vs. 7 times for the high density materials.



Experiment results of sustained release of absorbed anti-mosquito essential oil
                                            

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Experiment data of 0.16 and 0.25 nano-materials in sustained release of anti-mosquito essential oil: the low density materials have a large loading capacity (10 times) and a slower sustained release.
Experiment data of nano-materials of 0.16 density in sustained release of anti-mosquito essential oil: in the red curve, the sample disc filled with essential oil is exposed to air for 8 hours a day and then sealed up in packing bags. The above procedures are repeated in the following days. In the blue curve, the same sample is completely sealed up in packing bags for comparison. Experiments show that the nano-materials have the unprecedented uniform release capacity. They can absorb 5 times more of essential oils than the existing materials used in the market. The sustained release can last over 40 days for effective anti-mosquito effect. This is 10 times more than the existing products.