| 发明名称 | Determination of pore size in porous materials by evaporative mass loss | ||
| 摘要 | A method for determination of pore-size distribution in a porous material called evapo porometry (EP) is capable of determining pore sizes from approximately the nanometer scale up to the micron scale. EP determines the pore size based on the evaporative mass loss at constant temperature from porous materials that have been pre-saturated with either a wetting or non-wetting volatile liquid. The saturated porous material is placed in an appropriate test cell on a conventional microbalance to measure liquid mass loss at a constant temperature as a function of time. The mass-loss rate is then related to the pore-size distribution. The microbalance permits measuring the mass as a function of time. The slope of the mass versus time curve is the evaporation rate. The evaporation rate is related to the vapor pressure at the interface between the liquid in the porous material and the ambient gas phase. The vapor pressure in turn is related to the pore diameter. | ||
| 申请公布号 | US9618441(B2) | 申请公布日期 | 2017.04.11 |
| 申请号 | US201113695251 | 申请日期 | 2011.05.02 |
| 申请人 | National University of Singapore;The Regents of the University of Colorado, A Body Corporate | 发明人 | Greenberg Alan R.;Krantz William B.;Kujundzic Elmira;Yeo Adrian;Hosseini Seyed Saeid |
| 分类号 | G01N15/08;G01N5/04 | 主分类号 | G01N15/08 |
| 代理机构 | Dorsey & Whitney LLP | 代理人 | Dorsey & Whitney LLP |
| 主权项 | 1. An apparatus for determining pore size in a porous membrane material comprising a microbalance; a test cell for receiving the porous membrane material placed upon the microbalance, wherein the test cell is formed as a diffusion chamber with a top open to atmosphere and a base; the test cell is configured to hold the porous membrane material as a sole covering to an opening in the base and the test cell has a seal structure positioned around a perimeter of the opening in the base and outside a perimeter edge of the porous membrane material and configured to prevent lateral liquid and vapor loss between the porous membrane material and the base of the test cell; a temperature sensor configured to measure a temperature within the test cell; and a computing device connected to receive data output from both the microbalance of mass measurements over a period of time and the temperature sensor over the period of time and configured to calculate a pore size of pores in the porous membrane material based upon the data output. | ||
| 地址 | Singapore SG | ||