The Hong Kong University of Science and Technology

Guohua Chen

Zongjin Li

Xixiang Zhang

Zhimeng Liu

Caideng Yuan

Liang Guo

Jing Hu

Man Chi Lo

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

A method of depositing a stable diamond film on a metal substrate includes pretreating a surface of the substrate and depositing a diamond film on the substrate by way of a multi-stage chemical vapor deposition, in which each subsequent stage is performed at progressively higher temperature. The deposited diamond may be doped with boron. The substrate may be titanium, a titanium alloy, iron, an iron alloy, or any other valve metal. The diamond deposition may be a high temperature chemical vapor deposition. The first deposition stage may optionally create a carbide of diamond and substrate, and an optional mixture of diamond and amorphous carbon may be deposited to bond this carbide layer to a subsequently applied layer. The resulting product may be used as an electrode, as a tooth or blade in a cutting tool, or may have many other uses.

Method for making a highly stable diamond film on a substrate

The present invention provides a method for making modified jacobsite, Al-doped maghemite or modified maghemite nanoparticles that can be used to adsorb heavy metals, such as Cr(VI), found in wastewater. The magnetic nanoparticles can be separated using a magnetic field after adsorbing heavy metals from wastewater, and processed for reused.

Synthesis of modified maghemite and jacobsite nanoparticles

Growing community of inventors

Hong Kong, China

Guohua Chen