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111.
Heats of adsorption of organic molecules are a useful tool for the characterization of porosity and surface chemistry of microporous
materials. This work describes the possibility of using heats of adsorption of organic molecules, estimated from a methodology
derived from the Dubinin-Astakhov equation, for the characterization of Pillared Interlayered Clays. The estimated heats were
compared with data determined directly by adsorption microcalorimetry. It is shown that the chemical nature of the organic
probe molecule strongly conditions the obtained results. The best agreement between calculated and experimental values, amongst
the probe molecules studied, was found for toluene. 相似文献
112.
Rodrigues MR Lima A Codognoto L Villaverde AB Tavares Pacheco MT Moisés de Oliveira HP 《Journal of fluorescence》2008,18(5):973-977
The microenvironment formed by lauroyl and stearoyl derivatives of chitosan in solution has been studied using two fluorescent
probes, pyrene and nabumetone. Existence or not of microdomains formed by polymolecular associations, the inherent hydrophobicity
of them in aqueous solution, and the influence of degree of substitution (DS) of derivatives were investigated by emission
properties of pyrene and strengthened by the photophysical behavior of nabumetone. Additionally, the ratio between the fluorescence
intensities of first (~372 nm) to the third (~384 nm) bands of the emission spectrum of pyrene was used to determine the critical
aggregation concentration (CAC). In a previous work, it was already reported the characterization of chitosan derivatives
by three spectroscopic techniques (13C-NMR, 1H-NMR and infrared), as well as data on the solubility and swelling-index of them. In addition of that, the new results show
that the investigated lauroyl and stearoyl derivatives of chitosan are expected to be potential models for applications in
the medical field. 相似文献
113.
Dr. Borja Gómez-González Dr. Nuno Basílio Dr. Belén Vaz Dr. Moisés Pérez-Lorenzo Prof. Luis García-Río 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2024,136(7):e202317553
The determination of binding constants is a key matter in evaluating the strength of host–guest interactions. However, the profound impact of self-ion pairing on this parameter is often underrated in aqueous solution, leading in some cases to a misinterpretation of the true potential of supramolecular assemblies. In the present study, we aim to shed further light on this critical factor by exploring the concentration-dependent behavior of a multicharged pillararene in water. Our observations reveal an extraordinary 1-million-fold variability in the affinity of this macrocycle toward a given anion, showcasing the highly dynamic character of electrostatic interactions. We argue that these findings bring to the forefront the inherent determinism that underlies the estimation of affinity constants, a factor profoundly shaped by both the sensitivity of the instrumental technique in use and the intricacies of the experimental design itself. In terms of applications, these results may provide the opportunity to optimize the operational concentrations of multicharged hosts in different scenarios, aiming to achieve their maximum efficiency based on the intended application. Unlocking the potential of this hidden variability may pave the way for the creation of novel molecular materials with advanced functionalities. 相似文献