Q: What is graphene oxide? A: Graphene oxide (GO) is a two-dimensional material in which oxygen-containing functional groups are introduced into the graphene skeleton. The introduction of oxygen-containing functional groups, on the one hand, destroys the ideal π-electron conjugated structure of graphene, changing it from a conductor to an insulator. On the other hand, these functional groups also confer functions such as hydrophilicity, so that graphene oxide can form stable colloids in water and some low molecular weight alcohols. Using these chemically active functional groups, covalent bonding of graphene oxide with other materials can also be realized.
Q: What types of graphene materials are there? A: According to the different preparation processes, graphene materials can be divided into two categories: graphene oxide and graphene, and graphene can be divided into graphene microchip prepared by physical method, usually denoted by GNP, and reduced graphene oxide prepared by redox method, usually denoted by rGO, according to the different preparation processes.
Q: How to disperse if I want to use liquid? A: Weigh a certain amount of graphene oxide powder, add appropriate amount of dispersant according to the concentration you need, and then dispersed by ultrasonic to get a stable graphene oxide dispersion.
Q: Graphene oxide can be dispersed into which agents? A: Graphene oxide can be stably dispersed in water due to a large number of oxygen-containing functional groups, in addition, ethanol, acetic acid, NMP, DMF and so on are also good dispersants of graphene oxide.
Q: How to store unused graphene oxide powder after opening? A: It is recommended to store it in ventilated and dry environment with temperature not higher than 35ºC, and store it separately from strong reducing agents and flammable materials.
Q: What is the particle size of graphene oxide? A: At present, the particle size of our graphene oxide products is less than 5μm, if you need other sizes, please contact us for customization.
Q: How to dry the graphene oxide powder? A: Graphene oxide powder is prepared in two ways: the first is freeze-drying from slurry, and the second is spray-drying. The yield of freeze drying method is higher than spray drying method, and the morphology of graphene oxide is relatively more intact, but the cost of freeze drying method is relatively higher than spraying method. Our products are freeze-dried.
Q: Is the smaller the particle size of graphene oxide, the better the dispersibility? A: The dispersibility of graphene oxide has a little relationship with the particle size, but there is no direct influence on the relationship, the more critical influencing factor is the degree of oxidation as well as the dispersing technology, the oxygen content of more than 20% of the GO has been able to meet the normal dispersion needs.
Q: Graphene oxide dispersed in water is acidic or alkaline? A: Graphene oxide is weakly acidic when dispersed in water due to its acidic oxygen-containing functional groups. Some GO dispersions on the market that are more acidic are due to incomplete cleaning and high content of impurity ions.
Q: Can graphene oxide be stabilized under alkaline condition? A: Weakly alkaline conditions can be stable, but pH more than 11 is prone to agglomeration, because the adsorption of graphene oxide and metal ions under strong alkaline conditions changes the zeta potential of the lamellae, resulting in mutual attraction between the lamellae. In addition, it is easy to deoxidize under heating condition in alkaline solution, resulting in poor dispersion of the product.
Complaint
