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梦幻G铁杆木虫 (正式写手)
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【请教】pickering emulsion什么意思？
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如题，pickering emulsion什么意思？ 刚接触到这方面的东西，对该名词不是很了解！ |
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2楼2009-03-24 20:13:17
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3楼2009-03-25 07:39:40
sduyzj
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4楼2009-03-25 08:31:22
dgf2008
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memser(金币+3,VIP+0):感谢应助，欢迎常来微纳版交流讨论，谢谢。 3-25 12:38
memser(金币+3,VIP+0):感谢应助，欢迎常来微纳版交流讨论，谢谢。 3-25 12:38
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皮克林乳液 http://en.wikipedia.org/wiki/Pickering_emulsion A Pickering emulsion is an emulsion that is stabilized by solid particles (for example colloidal silica) which adsorb onto the interface between the two phases. This type of emulsion was named after its discoverer, S.U. Pickering, who first described the phenomenon in 1907.[1] If oil and water are mixed and small oil droplets are formed and dispersed throughout the water, eventually the droplets will coalesce to decrease the amount of energy in the system. However, if solid particles are added to the mixture, they will bind to the surface of the interface and prevent the droplets from coalescing thus causing the emulsion to be more stable. Properties such as hydrophobicity, shape, and size of the particle can have an effect on the stability of the emulsion. The particle’s contact angle to the surface of the droplet is a characteristic of the hydrophobicity. If the contact angle of the particle to the interface is low, the particle will be mostly wetted by the droplet and therefore will not be likely to prevent coalescence of the droplets. Particles that are partially hydrophobic (i.e. contact angle of approximately 90°) are better stabilizers because they are partially wettable by both liquids and therefore bind better to the surface of the droplets. The stabilization energy is given by where r is the particle radius, γOW is the interfacial tension, and θOW is the contact angle. When the contact angle is approximately 90°, the energy required to stabilize the system is at its minimum.[2] Generally the phase that preferentially wets the particle will be the continuous phase in the emulsion system.A Pickering emulsion is an emulsion that is stabilized by solid particles (for example colloidal silica) which adsorb onto the interface between the two phases. This type of emulsion was named after its discoverer, S.U. Pickering, who first described the phenomenon in 1907.[1] If oil and water are mixed and small oil droplets are formed and dispersed throughout the water, eventually the droplets will coalesce to decrease the amount of energy in the system. However, if solid particles are added to the mixture, they will bind to the surface of the interface and prevent the droplets from coalescing thus causing the emulsion to be more stable. Properties such as hydrophobicity, shape, and size of the particle can have an effect on the stability of the emulsion. The particle’s contact angle to the surface of the droplet is a characteristic of the hydrophobicity. If the contact angle of the particle to the interface is low, the particle will be mostly wetted by the droplet and therefore will not be likely to prevent coalescence of the droplets. Particles that are partially hydrophobic (i.e. contact angle of approximately 90°) are better stabilizers because they are partially wettable by both liquids and therefore bind better to the surface of the droplets. The stabilization energy is given by  where r is the particle radius, γOW is the interfacial tension, and θOW is the contact angle. When the contact angle is approximately 90°, the energy required to stabilize the system is at its minimum.[2] Generally the phase that preferentially wets the particle will be the continuous phase in the emulsion system.http://en.wikipedia.org/wiki/Pickering_emulsion [ Last edited by dgf2008 on 2009-3-25 at 11:17 ] |
5楼2009-03-25 11:14:56
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memser(金币+3,VIP+0):感谢应助，欢迎常来微纳版交流讨论，谢谢。 3-25 12:38
memser(金币+3,VIP+0):感谢应助，欢迎常来微纳版交流讨论，谢谢。 3-25 12:38
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pickering乳液可以粗略的认为是由固体颗粒代替表面活性剂而稳定的乳液。 背景如下： 最初，Ramsden 等人最早发现将不溶性固体细粉与水和一些油性溶剂进行混合分散时,固体细粉包裹在分散相液滴的表面,形成一个固体壳层;当分散相液滴相互碰撞时,固体壳层对液滴的变形和聚集起到阻碍作用,可以形成较为稳定的乳液,即固体稳定乳液( solid2stabilized emulsion) 。Pickering 等人 随后对固体稳定乳液进行了深入的研究,因而固体稳定乳液也常被称为Pickering 乳液。 我正在做pickering乳液 不过刚刚开始，楼主有什么事的话，大家多联系，碰到问题互相讨论一下 |
6楼2009-03-25 12:26:27
7楼2009-03-25 14:22:54