Room temperature stability

Prins F, Hayashi T, de Vos van Steenwijk BJA, Gao B, Osorio EA, Muraki K, van der Zant HSJ (2009) Room-temperature stability of Pt nanogaps formed by self-breaking. Appl Phys Lett 94 123108... 

CBE supplement (CBE), annual report, long-term/room temperature stability... 

As mentioned, room-temperature stability of an intramolecular peroxo adduct based on a derivative of tmpa has nevertheless been obtained By reducing steric strain with a more flexible —CH2—O—CH2— linker, 70% formation at 298K is obtained in EtCN and even full formation has been achieved meanwhile by switching to the less Cu(I)-coordinating acetone [138],... 

Milk fat and butter can be tailored to have desired properties and functionalities. Treatments are often aimed at improving cold spreadability without compromising room temperature stability. To modify the texture and rheological properties of butter, composition and processing conditions can be manipulated... 

Nearly 20 years ago, from these laboratories, a dark blue boron nitride fluorosulfate, (BN)4S03F, and a graphite relative, C12SO3F, were briefly described, and each was reported (9) to be an electrical conductor. Hooley, however, failed (10) to confirm these observations for the A-BN salt. The thermodynamic instability of the (BN)jS03F with respect to BF3 and other products had been noted in the original report (9). Subsequent work (11-13) in these laboratories found wide variations in the room-temperature stability of the product. 

Cu(dpp)2] (24) has a long-lived MLCT excited state, which is luminescent at room temperature. Stabilization of Cu by the dpp ligand is evident from the unusually high oxidation potential of [Cu(dpp)2]. ... 

The proposed cyclic peroxide bands are also observed In BR containing about 5 percent by weight of a peroxide-decomposing antioxidant (D-2), dl-t-butyl sulfoxide, shown In the top difference spectrum of Figure 2. The sulfoxide functions by thermal decomposition to products which destroy hydroperoxides (1, 23, 24),but It does not do so at 25°C. After three days at room temperature, stabilized BR exhibited trans methlne at 975 cm l as well as cyclic peroxide at 1080 and 820 cm. Apparently, the cyclic peroxide was not decomposed In the presence of the sulfoxide and must be fairly stable at 25°C since no carbonyls were detected. 

Data on variations in degradation rates with temperature are reported in Table I. The values of the activation energy for degradation all fall within 60-125 kj/mol. These are values normally observed in amide hydrolysis (12). For the three compounds studied, the activation energy increases as the room temperature stability of the resin solution increases. 

The stability of the protein in the biological matrix at intended storage temperatures (e.g., —20 C or —80°C) is assessed by determining freeze-thaw stabihty at a minimum of three cycles, short-term room temperature stability, and long-term storage stability for the time period of typical storage times (e.g. six months). 

Castro, A., MiUan, P., Ricote, J., Pardo, L. Room temperature stabilization of c-Bi2V05.5 and synthesis of the new fluorite phase f-Bi2V05 by a mechanochemical activation. J. Mater. Chem. 10, 767-771 (2000)... 

TABLE 73 Freeze/Thaw and Room Temperature Stability as Well as Reinjection Riprodndbility of Ribavirin (it = 6)... 

Secondary amines can successfully be used as heat cure catalysts if sufficient steric stabilization and/or chemical deactivation of the amine functional group occurs to promote room temperature stability. Several examples are shown in Table VII. Crystalline bis(N-cyclohexyl-3-aminopropyl) amine tetrahydrate has been used in epoxy adhesive and coating formulations as a stable curative. Interestingly, the water of hydration was found to act both as a cure accelerator and a flow stabilizer. 

Fluorophenoxycarbene 122 is such a species and was recently room-temperature-stabilized by incarceration (Figure 42). In 122, the O- and F-substituents stabilize the singlet state by 60kcalmoP compared to singlet methylene. This stabilization is, however, not large enough to render free 122 persistent at room temperature. On the contrary, if generated photochemically from... 

Although this route provides access to a useful control in the morphology of polyacetylene it has some minor inconveniences in that the precursor polymer (5) (with Ri=R2=CF3 and R3=R4=H) is quite unstable (half-life of about 20 hours at 293 K). In order to improve precursor polymer stability, a number of other derivatives of (1) can be prepared, the best results of which are obtained with a compound where Ri and R2 = -CH=CH-CH=CH-. This gives a soluble precursor polymer which is stable at room temperature and can be converted to polyacetylene and naphthalene at about 380 K. However, the improvement in room temperature stability of this precursor polymer is outweighed by a less easily accessible monomer and an increased difficulty in removing the eliminated naphthalene from the polyacetylene film. 

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