Topic
Buffer solution
About: Buffer solution is a research topic. Over the lifetime, 6948 publications have been published within this topic receiving 112440 citations. The topic is also known as: pH buffer & buffer.
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TL;DR: In the buffer solution with low ionic strength at pH values below 3, the conically shaped nanoch channels exhibited distinct ion current rectification, as expected for nanochannels with a positive surface charge, if voltages beyond ±2V range were scanned.
Abstract: Ion current through a nascent nanochannel with conically shaped geometry in PET (polyethylene terephthalate) membrane sandwiched between two same buffer solutions at pH ≤ 3 was routinely considered to exhibit no rectification and, if any, much weaker rectification than that for a nanochannel with a negative surface charge, since the surface charge on the membrane decreases to zero along with decreasing the pH value of the buffer solution down to the pKa of carboxylic acid. However, in this study, we discovered that in the buffer solution with low ionic strength at pH values below 3, the conically shaped nanochannels exhibited distinct ion current rectification, as expected for nanochannels with a positive surface charge, if voltages beyond ±2V range were scanned. We reasoned that the current rectification engendered by the positive surface charge of a conical nanochannel was due to further protonation of the hydrogen bonded hydrogel layer or neutral carboxylic acid inside the nanochannel. Therefore, our results enrich the knowledge about nanochannel technology and indicate that a nanofluidic diode based on pH-reversed ion current rectification through a conical nanochannel can be achieved without any modification of the PET membrane.
32 citations
TL;DR: In this article, the adsorption of sulfate species at polycrystalline gold electrodes was studied with in situ FTIR spectroscopy in a HF/KF buffer solution of pH = 2.8.
Abstract: The adsorption of sulfate species at polycrystalline gold electrodes was studied with in situ FTIR spectroscopy in a HF/KF buffer solution of pH = 2.8. This base electrolyte diminishes the effect o...
32 citations
TL;DR: In this article, a magnetic chitosan-modified Fe3O4@SiO2 with sodium tripolyphosphate adsorbent (MTPCS) was synthesized by surface modification of Fe 3O4+O4/SiO 2 with chitoshan using STPP as the cross-linker in buffer solution.
Abstract: A magnetic chitosan-modified Fe3O4@SiO2 with sodium tripolyphosphate adsorbent (MTPCS) was synthesized by surface modification of Fe3O4@SiO2 with chitosan using sodium tripolyphosphate (STPP) as the cross-linker in buffer solution for the adsorption of Cu(II) ions from aqueous solution. The structure and morphology of this magnetic nanoadsorbent were examined by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), BET surface area measurements, Fourier transform infrared spectrometer (FTIR), and X-ray photoelectron spectroscopy (XPS). The effects of initial pH, adsorbent amount, and initial concentration of heavy metal ions were investigated by batch experiments. Moreover, adsorption isotherms, kinetics, and thermodynamics were studied to understand the mechanism of adsorbing metal ions by synthesized MTPCS. The results revealed that adsorption kinetics was best depicted by the pseudo-second-order rate mode and intraparticle-diffusion models. The adsorption isotherm fitted well to the Langmuir model. Moreover, thermodynamic study verified the adsorption process was endothermic and spontaneous in nature. The maximum adsorption occurred at pH 5 ± 0.1, and the adsorbent could be used as a reusable adsorbent with convenient conditions.
32 citations
TL;DR: On the basis of special “turn-on” fluorescence response, intracellular pH was successfully imaged in a quantitatively ratiometric method by using 1 in conjunction with MitoTracker Red.
32 citations
TL;DR: In this paper, the effect of buffer type on mobility, selectivity and resolution in capillary zone electrophoresis (CZE) was studied, and the results showed that the sodium phosphate buffer gave shorter mobility times (tM) for a test dansyl amino acid mixture than the potassium phosphate buffer having the same concentration and pH.
Abstract: The effect of buffer type on mobility, selectivity and resolution in capillary zone electrophoresis (CZE) was studied. The results show that the sodium phosphate buffer gave shorter mobility times (tM) for a test dansyl amino acid mixture than the potassium phosphate buffer having the same concentration and pH. The resolution and selectivity were also better using the sodium phosphate buffer. A comparison of resolution, tM and selectivity using a monohydrogen and a dihydrogen sodium phosphate buffer (0. 1 M, pH 7. 0) showed no appreciable differences in selectivity and resolution, but the dihydrogen phosphate buffer gave tM which are almost 45% shorter than those obtained with the monohydrogen phosphate buffer. When monohydrogen and dihydrogen potassium phosphate (0. 1 M, pH 7) were used, differences in tM, selectivity and resolution were observed. Resolution improved with an increase in the buffer concentration (0. 2 M vs. 0. 1 M) but worsened and tM got considerably shorter when the concentrati...
32 citations