[Tex/LaTex] Change title to small caps but not in ToC

formattingsmall-capstable of contents

I want the title for the Acknowledgements page in my thesis to be in small caps. However, if I change it, it also changes in the table of contents.
ToC

How can I avoid this? Especially, the roman page number in the ToC is in small caps too, even if on the page it is in normal small letters. What I would like is to have the entry for Acknowledgements look the same way that the entry for Abstract does. Here a minimal example:

\documentclass[a4paper, titlepage]{article} 

\let\stdsection\section 
\renewcommand\section{\newpage\stdsection}

\begin{document}

\pagenumbering{roman}

\setcounter{secnumdepth}{0}

\begin{center}
\section{\sc{Acknowledgements}} 
Thanks
\end{center}

\section{Abstract} 
Abstract text

\tableofcontents

\cleardoublepage
\setcounter{page}{1}
\pagenumbering{arabic}

\section{Introduction}
Blablabla

\end{document}

Best Answer

\titleformat* (from the titlesec package) can be used in the body of the document; using a grouping mechanism, you can keep the effect local. In the example below I wrapped the format definition inside a command using a group to modify the aspect of only the desired sectional unit:

\documentclass[a4paper, titlepage]{article} 
\usepackage{titlesec}

\setcounter{secnumdepth}{0}

\newcommand\SpSection{%
  \titleformat*{\section}{\centering\scshape\Large}
}

\begin{document}

\pagenumbering{roman}

\begingroup
\SpSection
\section{Acknowledgements}
Thanks
\endgroup

\section{Abstract} 
Abstract text

\tableofcontents

\end{document}

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