Carbon Nanotube Bundle Comparisons (IMAGE) Rensselaer Polytechnic Institute Caption Nanotube height, diameter and spacing affect the densification process. If the nanotube bundles are too short, like those on the left, there is no densification at all. If the bundles are too tall, like those on the right, bundles are not rigid enough and tend to stick with one another after densification. The middle region, where bundles are between 30-65 micrometers tall, demonstrates good densification. Credit Rensselaer/Liu Usage Restrictions Please include credit line License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.