The Hong Kong University of Science and Technology

Nano and Advanced Materials Institute Limited

Zongjin Li

Hongyan Ma

Wenbin Hao

Honggang Zhu

Guohua Chen

Xixiang Zhang

Shengwen Tang

Caideng Yuan

Youyuan Lu

Zhimeng Liu

Wenlai Li

Biwan Xu

Chung Kong Chau

Faming Li

Ye Tian

Baoguo Ma

This invention provides a composite material for bipolar plates for fuel cells including cemented by a MPC binder and electrically conductive fillers, and a method of manufacturing the same. The resulting bipolar plate achieves low gas permeability, high electrical conductivity, high flexural strength and good corrosion resistance. The flexural strength and corrosion resistance can further be enhanced by the incorporation of macro-reinforcement and a polymer based surface treatment, respectively.

Magnesium phosphate cement based bipolar plate composite material

Measurement of the impedance and complex resistivity of a sample is used for measuring parameters resulting from a change in physical or chemical state. A variable frequency signal is provided by a transformer primary coil. A secondary coil of the transformer with a closed loop and electrically coupled said sample is monitored along with a leakage current sensor. Sampling at multiple signal frequencies is performed at the multiple signal frequencies.

Pore structure analyzer based on non-contact impedance measurement for cement-based materials

This invention provides a composition for thermal insulation, comprising magnesium oxychloride cement (MOC) and air-filled glass or ceramic beads, and a method of preparing said composition. The composition may further comprise one or more additives selected from the group consisting of titanium dioxide, fly ash, pigment, potassium dihydrogen phosphate (KHPO) and sodium dihydrogen phosphate (NaHPO).

Advanced inorganic material for reflection of electromagnetic waves

A novel method for the preparation of an aqueous polyacrylate modified polyurethane dispersion is disclosed. The preparation method includes three main steps: The aqueous polyacrylate modified polyurethane dispersion has self-crosslinkability when an unsaturated acetoacetoxy compound is used for the preparation of the polyacrylate emulsion.

Method for preparing aqueous polyacrylate modified polyurethane dispersions

The present invention provides an apparatus and method for measuring the resistivity of a sample of cement-based material. A transformer is formed with a primary coil, a secondary formed by means of a sample of said cement-based material, means for supplying a voltage to said primary, means for measuring the voltage induced in said sample, and means for measuring the current induced in said sample. The resistance of the sample can be measured and thus the resistivity of the concrete sample can be calculated.

Contactless, transformer-based measurement of the resistivity of materials

An admixture for enhancing the durability of concrete to repeated freeze-thaw cycles is disclosed. The admixture comprises as an essential element a natural polymer material derived from millet. The admixture further comprises smaller quantities of naphthenic sulfate salt, triethanolamine and formaldehyde. In addition the admixture can improve concrete's impermeability and chloride ion binding capability.

Concrete durability enhancing admixture

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Hong Kong, China

Zongjin Li