Guanquan Wang

The effect of temperature changes on electrical performance of the betavoltaic cell.

There is a significant relationship between temperature and electrical performance of a betavoltaic cell. Two silicon diodes used as energy conversion devices of betavoltaic cells were irradiated by Ni-63, and the relationships between the temperature and the electrical performance such as V(oc), I(sc), and P(max) were examined. I(sc) increased very little as temperature increased but V(oc) decreased considerably. The changing values of V(oc) were -3.1 and -3.0 mV/K, respectively, in the temperature range 233.15-333.15 K. As a result of this, P(max) and eta also decreased markedly.

Simulations about self-absorption of tritium in titanium tritide and the energy deposition in a silicon Schottky barrier diode

Simulations on the self-absorption of tritium electrons in titanium tritide films and the energy deposition in a silicon Schottky barrier diode are carried out using the Geant4 radiation transport toolkit. Energy consumed in each part of the Schottky radiovoltaic battery is simulated to give a clue about how to make the battery work better. The power and energy-conversion efficiency of the tritium silicon Schottky radiovoltaic battery in an optimized design are simulated. Good consistency with experiments is obtained.

Investigation on a radiation tolerant betavoltaic battery based on Schottky barrier diode

An Au-Si Schottky barrier diode was studied as the energy conversion device of betavoltaic batteries. Its electrical performance under radiation of Ni-63 and H-3 sources and radiation degradation under Am-241 were investigated and compared with those of the p-n junction. The results show that the Schottky diode had a higher I(sc) and harder radiation tolerance but lower V(oc) than the p-n junction. The results indicated that the Schottky diode can be a promising candidate for energy conversion of betavoltaic batteries.

A simple and convenient method for production of (89)Zr with high purity.

A simple and convenient method for radiochemical separation 89Zr with no harmful substance was explored. The separated 89Zr was found to be [89Zr]Zr-chloride, and the recovery of the radioactivity was 85%±3% with high radionuclidic purity (99.99%). The yields of 89Zr via the reaction of (p, n) or (d, 2n) on Y target were also evaluated on CS-30 cyclotron, indicating the latter was more favorable for the production of 89Zr with a yield of 58±4 MBq/μA·h.

The radiation damage of crystalline silicon PN diode in tritium beta-voltaic battery

A tritium beta-voltaic battery using a crystalline silicon convertor composed of (100)Si/SiO2/Si3N4 film degrades remarkably with radiation from a high intensity titanium tritide film. Simulation and experiments were carried out to investigate the main factor causing the degradation. The radiation damages mainly comes from the x-ray emitted from the titanium tritide film and beta particle can relieve the damages. The x-ray radiation induced positive charges in the SiO2 film destroying the output property of the PN diode with the induction of an electric field.

Coordination investigation of rhenium with MAG3 using LC-MS and UV spectrometer and the simple radiolabelling process

Due to the low concentration of 188Re-radiopharmaceuticals, identity confirmation of the complex is generally performed only indirectly by assessment of their retention time on HPLC. Herein, LC-MS and UV spectrometer are utilized to confirm the identity of the Re-mercaptoacetyltriglycine (MAG3) complex. The main peak in LC-MS spectrum coincided with the expected ion mass of the oxorhenium (V)-MAG3 complex. Meanwhile, possibility of generation of the tin complex during the coordination process was excluded. Additionally, the simple method of radiolabelling MAG3 with 188Re was developed. All the experimental results can confirm the purity and effective specific activity of the corresponding 188Re-MAG3.

Spectroscopic Investigation of a Synthetic Cyanine Amine Derivative upon Various Scaffolds

A detailed study of the supramolecular self-assembly of a cyanine amine derivative upon a variety of templates was conducted including investigation of charge properties, the rigidity of templates, and solubility. The amine derivative exhibited strong self-assembly on negatively-charged templates such as carboxymethyl amylose and carboxymethyl cellulose, and generated red-shifted absorption and enhanced fluorescence, which are characteristics of J-aggregation. Much less self-aggregation was observed for lower negatively-charged templates such as hyaluronic acid. The rigidity of templates had a great impact on self-aggregation in terms of no appreciable J- or H-aggregation observed on rigid Laponite clay. Cyanine amine existed in the molecular state with self-aggregates. For the carboxymethyl cellulose/cyanine amine system, the order of mixing each component impacted the aggregation of cyanine amine: carboxymethyl cellulose to cyanine amine mainly led to J-aggregation. In contrast, H-aggregation was dominant in cyanine amine to carboxymethyl cellulose.

Preparation and primary biological evaluation of novel nitrido-188Re complexes/lipiodol

Abstract Two new nitrido- 188 Re complexes were prepared by a modified method in high yield. These complexes were stable in vitro. The biodistribution in normal mice showed that these nitrido- 188 Re complexes could accumulate in liver and dissipate quickly from almost all organs. TAE was performed with the use of lipiodol solutions of two complexes to rabbit VX2 liver tumor models. SPECT images showed that the two lipiodol solutions could remain in tumor for about 9 h ( 188 ReN-NEPTDD/lipiodol) and 12 h ( 188 ReN-NEMMPTDD/lipiodol), respectively.

Preparation and biodistribution of 131 I-labeled graphene quantum dots

For the superiority of graphene quantum dots (GQDs) in bioimaging and drug delivery carrier, GQDs bring new opportunities for theranostics of diseases. In this study, GQDs were successfully prepared and labeled with 131I. The in vitro properties, biodistribution and SPECT imaging of 131I-GQDs were investigated. The uptake of 131I-GQDs at tumor sites can be clearly observed via SPECT imaging and T/B and T/M ratios increase with increasing time, which can contribute to enhanced permeability and retention (EPR) effect.

Effect of Temperature on the Ni-63 Betavoltaic Cell

There are significant relations between temperature and the electrical performances of betavoltaic cell. Two silicon diodes as the energy conversion device of betavoltaic cell were irradiated by Ni-63, checked the relations between temperature and the electrical performances such as Voc , Isc , Pmax etc. Isc increased very little as the temperature increasing but Voc decreased significantly. The changing values of Voc were −3.1 mV/k and −3.0 mV/k respectively within the temperature range of 233.15 K∼333.15 K. As a result of this, the Pmax , η etc. decreased markedly too.Copyright