Replication Data for: Long-Range Attraction between Graphene and Water/Oil Interfaces

<p>Atomic force microscopy (AFM) image raw data, force spectroscopy raw data, data analysis/data plotting, and force modeling.</p>
<h2>File Formats</h2>
<ul>
<li>The raw files of the AFM imaging scans of the colloidal probe surface are provided in NT-MDT's proprietary <i>.mdt</i> file format, which can be opened using the Gwyddion software package. Gwyddion has been released under the GNU public software license GPLv3 and can be downloaded free of charge at <a href="http://gwyddion.net/">http://gwyddion.net/</a>. The processed image files are included in Gwyddion's <i>.gwy</i> file format. </li>
<li>Force spectroscopy raw files are also provided in <i>.mdt</i> file format, which can be opened using NT-MDT's NOVA Px software (we used 3.2.5 rev. 10881). All the force data were converted to ASCII files (<i>*.txt</i>) using the NOVA Px software to also provide them in human readable form with this data set. </li>
<li>The MATLAB codes used for force curve processing and data analysis are given as <i>*.m</i> files and can be opened by MATLAB (<a href="https://www.mathworks.com/products/matlab">https://www.mathworks.com/products/matlab</a>) or by a text editor. The raw and processed force curve data and other values used for data processing are stored in binary form in <i>*.mat</i> MATLAB data files, which can be opened by MATLAB. </li>
<li>Organized by figure, all the raw and processed force curve data are given in Excel worksheets (<i>*.xlsx</i>), one per probe/substrate combination. </li></ul>
<h2>Data (Folder Structure)</h2>
The data in the dataverse is best viewed in "Tree" mode.
<h3>Codes for Force Curve Processing </h3>
<p> The three MATLAB codes used for force curve processing are contained in this folder. The text file <i>Read me.txt</i> provides all the instructions to process raw force data using these three MATLAB codes.</p>
<h3>Figure 3B, 3C – AFM images</h3>
The raw (<i>.mdt</i>) and processed (<i>.gwy</i>) AFM images of the colloidal probe before and after coating with graphene oxide (GO) are contained in this folder.
<h3>Figure 4 – Force Curve GO</h3>
The raw data of the force curve shown in Figure 4 and the substrate force curve data (used to find inverse optical lever sensitivity) are given as <i>.mdt</i> files and were exported as ASCII files given in the same folder. The raw and processed force curve data are also given in the <i>variables_GO_Tip 18.mat</i> and <i>GO_Tip 18.xlsx</i> files. The force curve processing codes and instructions can be found in the "Codes for Force Curve Processing" folder, as mentioned above.
<h3>Figure 5A – Force–Displacement Curves GO, rGO1, rGO10</h3>
All the raw data of the force curves (GO, rGO1, rGO10) shown in Figure 5A and the corresponding substrate force curve data (used to find inverse optical lever sensitivity) are given as <i>.mdt</i> files and were exported as ASCII files given in the same folder. The raw and processed force curve data are also given in <i>*.mat</i> and <i>*.xlsx</i> files.
<h3>Figure 5B, 5C – Averages of Force and Displacement for Snap-On and Pull-Off Events</h3>
All the raw data of the force curves (GO, rGO1, rGO10) for all the probes and corresponding substrate force curve data are given as <i>.mdt</i> files and were exported as ASCII files given in this folder. The raw and processed force curve data are also provided in <i>*.mat</i> and <i>*.xlsx</i> files. The snap-on force, snap-on displacement, and pull-off displacement values were obtained from each force curve and averaged as in <i>Code_Figure5B_5C.m</i>. The same code was used for plotting the average values.
<h3>Figure 6A – Force–Distance Curves GO, rGO1, rGO10</h3>
The raw data provided in "Figure 5A – Force Displacement Curves GO, rGO1, rGO10" folder were processed into force-vs-distance curves. The raw and processed force curve data are also given in <i>*.mat</i> and <i>*.xlsx</i> files.
<h3>Figure 6B – Average Snap-On and Pull-Off Distances</h3>
The same raw data provided in "Figure 5B, 5C – Average Snap on Force, Displacement, Pull off Displacement" folder were processed into force-vs-distance curves. The raw and processed force curve data of GO, rGO1, rGO10 of all the probes are also given in <i>*.mat</i> and <i>*.xlsx</i> files. The snap-on distance and pull-off distance values were obtained from each force curve and averaged as in <i>Code_Figure6B.m</i>. The code used for plotting is also given in the same text file.
<h3>Figure 6C – Contact Angles</h3>
Advancing and receding contact angles were calculated using each processed force-vs-distance curve and averaged according to the reduction time. The obtained values and the code used to plot is given in <i>Code_Figure6C.m</i>.
<h3>Figure 9A – Force Curve Repetition</h3>
The raw data of all five force curves and the substrate force curve data are given as <i>.mdt</i> files and were exported as ASCII files given in the same folder. The raw and processed force curve data are also given in <i>*.mat</i> and <i>*.xlsx</i> files.
<h3>Figure 9B – Repulsive Force Comparison</h3>
The data of the zoomed-in region of Figure 9A was plotted as "Experimental curve". Initial baseline correction was done using the MATLAB code <i>bc.m</i>, and the procedure is given in the <i>Read Me.txt</i> text file. All the raw and processed data are given in <i>rGO10_Tip19_Trial1.xlsx</i> and <i>variables_rGO10_Tip 19.mat</i> files. The MATLAB code used to model other forces and plot all the curves in Figure 9B is given in <i>Exp_vdW_EDL.m</i>.