In most cases the default classicthesis section style gives no problem. But, there is some sections in which I need to customized the section font style.
For example,
\section{Fe\textsubscript{oct2} terminated Fe\textsubscript{3}O\textsubscript{4} nanocluster model}
would make all letter small caps:
but I want the letter "e" in Fe and "oct2" in subscript written as small letter instead of small caps:
How can I achieve that?
The following seems to work (assuming classicthesis' pdfspacing option is active). I don't know if there are places when classicthesis uses its \spacedlowsmallcaps where the non-robust redefinition would cause troubles...
\documentclass{scrbook}
\usepackage[pdfspacing]{classicthesis}
% loadad by `classicthesis' already but so we know it's there,
% provides \NoCaseChange:
\usepackage{textcase}
% chemical formulae:
\usepackage{chemmacros}
\chemsetup{chemformula/format=\normalfont}
% better: use lining numbers for the formulae:
% \chemsetup{chemformula/format=\normalfont\fontfamily{ppl}\selectfont}
% patch \sectionmark, should probably do the same to \chaptermark
% if you're using chapters
\usepackage{etoolbox}
\patchcmd\sectionmark
{\spacedlowsmallcaps{#1}}
{\unexpanded{\spacedlowsmallcaps{#1}}}
{}{}
% the original definition of \spacedlowsmallcaps but not robust:
\renewcommand\spacedlowsmallcaps[1]{\textls[80]{\textsc{\MakeTextLowercase{#1}}}}
\begin{document}
\tableofcontents
\chapter{Some Title}
\section{\NoCaseChange{\ch{Fe_{oct2}}} terminated \NoCaseChange{\ch{Fe3O4}} nanocluster model}
% let's see what the header looks like:
\newpage\null\newpage\null
\end{document}
The table of contents:
The heading:
The header:
classicthesis is printing the heading as lower case small caps already. So you (a) need to switch off the \scshape, easiest done with \textnormal, (b) need to reduce the size of the letter, \scriptsize is one choice, other sizes could be acheived with \fontsize{size}{baselineskip}\selectfont. For the subscripts an extra \textnormal seems fine. You should also provide an optonial argument to \section so these formatting commands don't apply to the table of contents.
EDIT If you also have running heads, then you have change \sectionmark to include the formatting there.
running head
\documentclass{scrbook}
\usepackage[nochapters,pdfspacing]{classicthesis}
\newcommand{\hdlower}[1]{\textnormal{\scriptsize #1}}
\newcommand{\hdsub}[1]{\textsubscript{\textnormal{#1}}}
\usepackage{lipsum} %dummy text for illustration
\begin{document}
\tableofcontents
\bigbreak
\hrule
\bigbreak\noindent
Document Body:
\section[Fe\textsubscript{oct2} terminated
Fe\textsubscript{3}O\textsubscript{4} nanocluster model]%
{F\hdlower{e}\hdsub{oct2} terminated
F\hdlower{e}\hdsub{3}O\hdsub{4} nanocluster model}
\sectionmark{F\hdlower{e}\hdsub{oct2} terminated
F\hdlower{e}\hdsub{3}O\hdsub{4} nanocluster model}
\lipsum[1-10]
\end{document}
The above code provides two commands \hdlower and \hdsub to enact the above suggestions.
\chemsetup{chemformula/format=\normalfont\fontfamily{ppl}\selectfont}so that chemical formulae get lining numbers instead of oldstyle ones. – cgnieder Mar 08 '13 at 12:32\chemsetup{chemformula/format=\normalfont\fontfamily{MinionPro}\selectfont}instead ? – user26939 Mar 08 '13 at 12:47MinionPropackage installed but according to the documentation something like\chemsetup{chemformula/format=\normalfont\figureversion{lining,proportional}}should work. You might also need to change the redefinition of\spacedlowsmallcapsto\renewcommand\spacedlowsmallcaps[1]{\textssc{\MakeTextLowercase{#1}}}with Minion Pro. – cgnieder Mar 08 '13 at 12:59\textsubscript{}instead. But that's another issue. – user26939 Mar 08 '13 at 14:06\textsubscript{}to replace\ch{...}didn't work here. Is that expected ? – user26939 Mar 08 '13 at 14:31chemmacros(and some other packages, too) relies on up to date versions of some programming packages. – cgnieder Mar 08 '13 at 14:33