Willie L. Hinze

Willie HinzeProfessor

B.S., 1970
M.S., 1972, Sam Houston State University (Ray E. Humphrey)
Ph.D. 1974, Texas A & M University (Janos H. Fendler)

Office: Salem 211
Phone: (336) 758-5509
Email: hinze@wfu.edu

 

Analytical Chemistry 

Research interests primarily focus on utilization of the unique properties and  features of organized assemblies (surfactant micelles, cyclodextrins, liposomes  and surfactant vesicles, and reverse micelles) and other membrane mimetic  agents (organogels and ionenes) to enhance chemical analysis and separation  science techniques.  Specific current  projects include:

(1) Advances in Cloud Point  Extractions:  Upon ionic strength or  temperature alteration, aqueous solutions of some micelle and/or polymer  solutions can phase separate, with most of the surfactant (or polymer)  concentrated in the small volume element of the surfactant-rich (or  polymer-rich) phase.  Any analyte species  that associates or binds to the micelle/polymer entity will thus be  concentrated in that phase.  Such phase behavior  (clouding phenomenon) of ordered media systems can be employed to design  environmentally friendly extractive / enrichment techniques.  The extension of this approach for the  extraction of nanomaterials and microbes as well as recovery of target analytes  from “solid” matrices is a particular focus of current research.

(2)  Extractions using Surfactant-  and Chitosan-Based Organogel Materials:  The addition of gelatin to some reversed  micelle solutions above a critical temperature results in the formation of  elastic (solid) gels, which still retain many of the general and beneficial  features of reversed micelle solutions. Likewise, chitosan gel-like materials  can be synthesized.  The general  properties and characteristics of these materials are being investigated.   In  addition, such gels can be used to sorb and concentrate desired analytes in a  manner akin to a liquid-liquid extraction or enrichment step prior to spectral  or other analysis. Of particular interest is the use of such gels to  concentrate and detoxify substances of environmental concern (phenols,  anilines, etc.) from aqueous or organic solutions.

Representative Publications:

Cloud Point Extraction with Surfactant Derivatization as an Enrichment Step Prior to Gas Chromatographic or Gas Chromatographic – Mass Spectrometric Analysis, Yoshitaka Takagai and Willie L. Hinze, Analytical Chemistry, 81 (2009) 7113 – 7122.

Evaluation of the Potential of Chitosan Hydrogels to Extract Polar Organic Species from Nonpolar Organic Solvents:  Application to the Extraction of Aminopyridines from Hexane, Valfredo T. de Favere and Willie L. Hinze, Journal of Colloid and Interface Science, 330 (2009) 38 – 44.

Fluorescence in Organized Assemblies, Najma Memon, Aamna Balouch, and Willie L. Hinze, in Encyclopedia of Analytical Chemistry, R. A. Meyers, Ed., John Wiley & Sons Ltd.:  Chichester, UK, 2008, DOI:  10.1002/9780470027318.a5409.pub2; 94 pp.

Surfactant-Mediated Cloud Point Extractions:  An Environmentally Benign Alternative Separation Approach, Frank H. Quina and Willie L. Hinze, Industrial & Engineering Chemistry Research, 38 (#11) (1999) 4150-4168.