<div>Hello Shivam,</div><div>you can use some graphical tool, probably, or do it by hand. I personally do not use any external tool, I cannot advice you there. With  some simple computing software like matlab/octave, or python or even excel, it does not take that long, and it becomes easier every time.</div><br><div>Once you have put all the atoms in the right place, be sure to put them in a large enough cell to have 10-20Å of vacuum around to avoid images from interacting.</div><br><div>kind regards</div><br><div><signature id="local-80497166-1ed1">--<br><span style="font-size:0.9em;color:gray;">Lorenzo Paulatto - Paris<span></span></span></signature></div><div class="gmail_quote_attribution">On Jun 15 2021, at 9:49 am, Shivam Kansara <sidkans23@gmail.com> wrote:</div><blockquote><div><div class="gmail_default"><font style="font-size:large"><font style="font-family:"times new roman", serif">Dear all,</font></font></div><div class="gmail_default"><font style="font-size:large"><font style="font-family:"times new roman", serif">I am Shivam Kansara and wish to work on nanoparticle systems. I wish to make a bulk system into nanoparticles (0D). So how to make nanoparticles from bulk systems e.g. FeO or CoO. ?</font></font></div><div class="gmail_default"><font style="font-size:large"><font style="font-family:"times new roman", serif">Please help me in this regard.</font></font></div><div class="gmail_default"><br></div><div class="gmail_default"><font style="font-size:large"><font style="font-family:"times new roman", serif">Thanking you in advance</font></font></div><div><br></div><div>--</div><div class="gmail_signature"><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><img src="https://docs.google.com/uc?export=download&id=15gbx7mtwk0dwsTQj6NfZXVlD_Y1NolOM&revid=0B8aFn9FcnevGK1d2WVlrVmdRaTNtczcvZGNabTB5L2NWbXdvPQ" width="72" height="96"></div><br></div></div><div><div><div><div><div><span style="color:#666666"><font size="1"><strong>-- With Regards</strong></font></span></div></div><div><span style="color:#666666"><font size="4"><font style="font-family:georgia, serif">Dr. Shivam Kansara</font></font></span></div></div></div><div><span style="color:#666666"><font style="font-family:georgia, serif">Web:</font></span><span style="color:#ff9900"><font style="font-family:georgia, serif"> </font></span><span style="color:#ff9900"><font style="font-family:georgia, serif"><a href="https://scholar.google.co.in/citations?user=gucGzjsAAAAJ&hl=en" title="https://scholar.google.co.in/citations?user=gucGzjsAAAAJ&hl=en">https://scholar.google.co.in/citations?user=gucGzjsAAAAJ&hl=en</a></font></span></div><div><div><font style="font-family:georgia, serif"><span style="color:#ff9900">           </span></font><font style="font-family:georgia, serif"><a href="https://www.researchgate.net/profile/Shivam_Kansara" title="https://www.researchgate.net/profile/Shivam_Kansara">https://www.researchgate.net/profile/Shivam_Kansara</a></font></div></div><div><div><span style="color:#ff9900"><font style="font-family:georgia, serif"><font style="font-size:13px">          </font></font></span></div><div><a href="https://sites.google.com/view/shivamkansara" title="https://sites.google.com/view/shivamkansara">https://sites.google.com/view/shivamkansara</a></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br><div><div><table border="0" cellpadding="8" cellspacing="0" style="user-select: none;"><tbody><tr><td><a id="signatureLink-logo" href="https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&" class="" style="text-decoration:none"><img src="https://s3.amazonaws.com/mailtrack-signature/sender_notified.gif" alt="Mailtrack" class="" width="32" height="32"> </a> </td> <td> <span style="color:#777">Sender notified by</span><br><a id="signatureLink-text" href="https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&" class="mt-install" style="color:#4374f7">Mailtrack</a> <span style="color:transparent;font-size:0">06/15/21, 12:35:48 PM</span></td><td></td></tr></tbody></table></div></div></div><div>_______________________________________________</div><div>Quantum ESPRESSO is supported by MaX (www.max-centre.eu)</div><div>users mailing list users@lists.quantum-espresso.org</div><div>https://lists.quantum-espresso.org/mailman/listinfo/users</div></blockquote><img class="mailspring-open" alt="Sent from Mailspring" width="0" height="0" style="border:0; width:0; height:0;" src="https://link.getmailspring.com/open/A17FD036-7CF1-49D7-B05D-D1749580AC99@getmailspring.com?me=ca1a67e4&recipient=dXNlcnNAbGlzdHMucXVhbnR1bS1lc3ByZXNzby5vcmc%3D">