Friction data from: Directional hydration lubrication underwater: Enabled by TA/PAAm submicron particles

Achieving durable hydration lubrication underwater is challenging due to interference from interfacial hydration layers. This study developed tannic acid/polyacrylamide (TA/PAAm) nanoparticles, synergistically combining TA's adhesive pyrogallol groups with PAAm's hydrophilic chains to enhance aqueous lubrication. Tests showed TA/PAAm suspensions improved copper/ultra-high molecular weight polyethylene tribo-pair wettability by 42% (contact angle reduction), lowered friction coefficients by 29%, and reduced wear volume by 56% versus water. Mechanistically, TA immobilizes nanoparticles onto surfaces via catechol-mediated adhesion to form a protective film, whereas PAAm disrupts the hydration layer via its hydrophilicity, establishing a hydrogen-bonded lubrication network and thereby enhancing lubrication performance. This strategy provides an environmentally friendly directional lubrication solution for marine applications such as water-lubricated bearings and subsea mechanical seals.
, , # Friction data from: Directional hydration lubrication underwater: Enabled by TA/PAAm submicron particles

Dataset DOI: [10.5061/dryad.kwh70rzjd](https://doi.org/10.5061/dryad.kwh70rzjd)

## Description of the data and file structure

The friction experimental data and parameters related to the paper 'Directional Hydration Lubrication Underwater: Enabled by TA/PAAm Nanoparticles'.

### Files and variables

#### File: Time_-_Coefficient_of_friction-50N.txt

**Description:** Friction data under a 50N load

##### Variables

* The friction time under a 50N load
* Water:Friction data under 50N load in water environment
* TA:Friction data under 50N load in TA environment
* PAAm:Friction data under 50N load in PAAm environment
* TA/PAAm-1:Friction data under 50N load in TA/PAAm-1 environment
* TA/PAAm-2:Friction data under 50N load in TA/PAAm-2 environment
* TA/PAAm-3
:Friction data under 50N load in TA/PAAm-3 environment

#### File: Time_-_Coefficient_of_friction-100N.txt

**Description:**...,