a b s e n c e of surface d e p o s i t s of m e t h y l trimethoxysilane-derived reaction products.)
_ Quick" Connects
Future work We a r e t r y i n g to i m p r o v e t h e consol i d a t i o n of c a l c i t e - b e a r i n g r o c k s by a d j u s t i n g f o r m u l a t i o n s to r e d u c e e v a p o r a t i o n of m e t h y l t r i m e t h o x y s i l a n e w h i l e f o r m i n g gels w i t h good mechanical properties. Another im p o r t a n t objective is t h e i m p r o v e m e n t of c o n s o l i d a n t / s t o n e s u b s t r a t e a d h e sion. A l t h o u g h t h e r e m a y be good a d hesion between alkoxysilane-derived gels a n d s i l i c a t e - b a s e d m i n e r a l s s u c h a s q u a r t z (one w o u l d a n t i c i p a t e a bonding affinity between silicate rocks a n d t h e S i - 0 l i n k a g e s f o r m e d by t h e r e a c t i v e a l k o x y s i l a n e ) , a d h e sion-promoting chemical compatibil ity is a b s e n t in c a l c i t e - b a s e d rocks. O n e a p p r o a c h to r e m e d y t h i s d e b i l i t y is to employ a c h e m i c a l i n t e r m e d i a r y t h a t m i g h t b o n d b o t h to t h e calcite a n d to r e a c t i n g m u l t i f u n c t i o n a l , m u l ticomponent adhesion promoters.
We thank Fred Osterholtz of Union Carbide for making the 29Si NMR spectroscopy work possi ble. We also thank Laura Cerruti (HewlettPackard) for her assistance in interpreting and producing the graphics for the gas chromatograms. We would particularly like to express our gratitude to Anita Ciriello (HewlettPackard), whose support and encouragement brought this article to fruition.
...SEAL LEAK-TIGHT IN VACUUM or PRESSURE SERVICE Combine Stems & Bodies with various end connections to meet your special needs • SWAGELOK® Tube Fitting, male and female NPT, BSP/ISO, AN, and hose connector end connections • Pressures from vacuum to 3000 PSI; Temperatures to 400°F • 316SS with Viton O-Rings or brass with Buna O-Rings (other seal mate rials available) • Easy fingertip push-to-couple operation
• Automatic shutoff and instant seal when uncoupling • Single- or double-end shutoff • Sizes from 1/8" to 1/2;' 6mm to 12mm • Stem and body protectors available Heavy-duty sleeve protects body while uncoupled
STEMS BODIES
ffSff\^F*!!
Immediately available from your local Authorized Sales & Service Representative.
References (1) Amoroso, G.; Fassina, V. Stone Decay and Conservation; Elsevier: New York, 1983; p. 225. (2) Sayre, E. V. In Conservation of Stone; Thomson, G., Ed.; ICC: London, 1970; pp. 115-18. (3) Lewin, S. Z.; Baer, N. S. Stud. Conserv. 1974, 19, 2 4 - 3 5 . (4) Price, C. Α.; Ross, K. D. Monumentum 1984, 27(A), 301-12. (5) Von Ebelman, J. J. Annalen der Chemie und Pharmacie 1846, 57, 334-38. (6) Von Hoffman, A. W. Stone-Preserving Processes. The Builder; HMSO: London, 1861, pp. 103-05. (7) Bosch, E.; Roth, M.; Gogolok, K. U.S. Patent 3 955 988, 1976. (8) Hempel, K.; Moncrieff, A. "Report on Work Since Last Meeting in Bologna, October 1971"; The Conservation of Stone I. Centro per la Conservazione delle Sculture all'Aperto, Bologna, Italy, 1976; pp. 319-40. (9) Arnold, L.; Price, C. A. Alkoxysilanes for the preservation of stone. Building Research Station Note, 1976. (10) Scherer, G. W. In Ultrastructure Pro cessing of Advanced Ceramics; Mackenzie, J. D.; Ulrich, D. R., Eds.; Wiley: New York, 1987; pp. 295-302. (11) Hemperer, W.; Rawamuroki, S. D. In Better Ceramics through Chemistry III; Brinker, C. J.; Clark, D. E.; Ulrich, D. R , Eds.; MRS: Pittsburgh, 1988; pp. 1-14. (12) Wheeler, G. In Ultrastructure Process ing of Advanced Ceramics; Mackenzie,
fWiOS^u*Q U I C K-CO Ν Ν E C T S
SWAGELOK Co. Solon, Ohio 44139 SWAGELOK Canada Ltd. Ontario
Viton-TMDuPont 1990 SWAGELOK Co.. all rights reserved PF-4-092
CIRCLE 127 ON READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 64, NO. 5, MARCH 1, 1992 · 355 A
