Superparamagnetic particles offer a new way to probe the kinetics of adhesive processes. Two different scenarios of physical adhesion are studied. The thermal activation of van der Waals adhesion is well described by an Arrhenius model. In contrast, it is necessary to go beyond the Arrhenius description to understand the thermal activation of bridging between colloidal particles by a polymer at...

The dissociation kinetics of a series of doubly deprotonated oligonucleotide 7-mers [d(A)7 , d(AATTAAT), d(TTAATTA), and d(CCGGCCG)] were measured using blackbody infrared radiative dissociation in a Fourier-transform mass spectrometer. The oligonucleotides dissociate first by cleavage at the glycosidic bond leading to the loss of a neutral nucleobase, followed by cleavage at the adjacent (59) ...

We have used temperature-dependent single molecule force spectroscopy to stretch covalently anchored carboxymethylated amylose (CMA) polymers attached to an amino-functionalized AFM cantilever. Using an Arrhenius kinetics model based on a Morse potential as a one-dimensional representation of covalent bonds, we have extracted kinetic and structural parameters of the bond rupture process. With 3...

composite solid propellants were prepared with and without nano-alloys (ti-co, ti-ni, ti-zn), where nano-alloys used as catalyst. these nano-alloys are prepared by hydrazine reduction method. catalytic properties of these nanomaterials were measured on ammonium perchorate/hydroxyterminatedpolybutadiene propellant by thermogravimetery analysis and differential thermal analysis. both experimental...

The laser-induced fluorescence (LIF) excitation spectra of the 4-methylcyclohexoxy and d11-cyclohexoxy radicals have been measured for the first time. LIF intensity was used as a probe in direct kinetic studies of the reaction of O(2) with trans-4-methylcyclohexoxy and d11-cyclohexoxy radicals from 228 to 301 K. Measured rate constants near room temperature are uniformly higher than the Arrheni...

Triphenyl tetrazolium chloride (TTC) reduction by cucumber (Cucumis sativus L. cv Poinsett 76 and cv Ashley) leaf discs was used as a viability assay to examine the effect of temperature pretreatment on the tissue response to acute hyperthermia. Semi-logarithmic plots of TTC reduction as a function of incubation time at different temperatures from 40 to 60[deg]C resembled the heat survival curv...

Mo/Si multilayer mirrors are used for extreme ultraviolet (EUV) lithography. The formation of hydrogen-induced blisters in the is a problem that reduces reflectance mirror. To evaluate blister-resistance EUV mirrors, blister processes multilayers with capping layer were investigated using high-frequency hydrogen plasma system as ion source under varying exposure conditions. As result, it was ob...

Silica is known as the archetypal strong liquid, exhibiting an Arrhenius viscosity curve with a high glass transition temperature and constant activation energy. However, given ideally isostatic nature of silica network, presence even small concentration defects can lead to significant decrease in both energy for viscous flow. To understand impact trace level dopants on silica, we measure visco...

In crystalline silicon, atomic hydrogen released from dimers forms acceptor–hydrogen pairs during annealing in the dark at elevated temperatures. this study, formation of boron–hydrogen (BH) and gallium–hydrogen (GaH) 1 Ω cm silicon is investigated temperatures ranging 140 to 220 °C. Acceptor–hydrogen concentrations low 10 14 − 3 range are quantified by means highly sensitive resistance measure...

We study the role of filler concentration and microphysics on rheology polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning, yielding behavior is observed for volume fractions [Formula: see text]. Time-temperature superposition was using an Arrhenius-type horizontal shift factor, giving a flow activation energy that dep...