Project developed by Abhijeet Patil, Shubham Jain and Saurabh Karanke for MSE5777 class

Liquid nitrogen—LN2—is nitrogen in a liquid state at low temperature (−195.79 °C (77 K; −320 °F) boiling point at sea level)

As a cryogenic fluid that rapidly freezes living tissue, its handling and storage require thermal insulation. It can be stored and transported in vacuum flasks, the temperature being held constant at 77 K by slow boiling of the liquid. Depending on the size and design, the holding time of vacuum flasks ranges from a few hours to a few weeks. The development of pressurised super-insulated vacuum vessels has enabled liquefied nitrogen to be stored and transported over longer time periods with losses reduced to 2% per day or less.

Liquid nitrogen is very cold! At normal atmospheric pressure, nitrogen is a liquid between 63 K and 77.2 K (-346°F and -320.44°F). Over this temperature range, liquid nitrogen looks much like boiling water. Below 63 K, it freezes into solid nitrogen. Because liquid nitrogen in a usual setting is boiling, its usual temperature is 77 K.

Liquid nitrogen boils into nitrogen vapor at room temperature and pressure. The cloud of vapor that you see isn't steam or smoke. Steam is invisible water vapor, while smoke is a product of combustion. The cloud is water that has condensed out of the air from exposure to the cold temperature around the nitrogen. Cold air cannot hold as much humidity as warmer air, so a cloud forms.

The double walled Cryogenic flask has adjustable lids which will cover the flask after the round bottom flask is inserted into it which will reduce the rate of evaporation of Liquid Nitrogen.

A retort stand, sometimes called a clamp stand or a ring stand,[1] is a piece of scientific equipment to which clamps can be attached to hold other pieces of equipment and glassware – for instance, burettes, test tubes and flasks. Accessories such as ring clamps, versatile clamps, 3-prong clamps, and burette clamps can be attached to better hold certain types of glassware.[2]. The basic retort stand consists of two main metal pieces: the base and the retort rod

The flask has an inbuilt Retort stand thus any clamp can be attached to  hold other pieces of equipment and glassware.

3D Printing such a flask has a cost saving advantage. PETG filament costing ~$12.5 was required for the entire package, whereas, commmercial equivalents cost around $360 which means a 96% savings in cost using 3DP! 

Reference Links-

https://www.sciencedirect.com/science/article/pii/S0011227516303460?via%3Dihub

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5116258/

https://www.zoro.com/chemglass-dewar-flask-1900ml-borosilicate-cg-1593-04/i/G5973633/

https://www.thomassci.com/Laboratory-Supplies/Dewar-Flasks/_/LOW-FORM-HEMISPHERICAL-DEWAR-FLASKS?q=Dewar%20Flask