Monodispersed quinacridone nanocrystals were fabricated by a high-temperature and high-pressure liquid crystallization method, which proved to be an advanced technique for fabricating nanocrystals of pigment compound. The aqueous dispersion liquid of quinacridone nanocrystals was very stable. The nanocrystats had a spherical shape with an average size of 60 nm when water was used as the high-temperature and high-pressure liquid at 260 degrees C and cooling solvent. The crystal structure of the nanocrystals could be controlled by varying the experimental conditions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1166/jnn.2003.215 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
An "all-in-one" strategy based on the organic molecule DCN-4CQA for effective NIR-fluorescence-imaging-guided dual phototherapy.
J Mater Chem B
July 2021
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun 130012, P. R. China.
Dual phototherapy combining photodynamic therapy (PDT) and photothermal therapy (PTT) is considered to be a more effective therapeutic method against cancer than single treatment. Therefore, the development of a single material with both near-infrared (NIR)-laser-triggered PDT and PTT abilities is highly desirable but remains a great challenge. A design philosophy for photosensitizers for integrated PDT and PTT treatment has been put forward: (1) a high molar extinction coefficient in the NIR region; (2) suitable LUMO and T1 energy levels to regulate intersystem crossing for effective singlet oxygen (1O2) generation for PDT; and (3) the suppression of fluorescence emission to enhance the process of nonradiative transition with appropriate chemical modifications.
View Article and Find Full Text PDFCellular interfaces with hydrogen-bonded organic semiconductor hierarchical nanocrystals.
Nat Commun
July 2017
Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University, Altenbergerstraße 69, 4040, Linz,, Austria.
Successful formation of electronic interfaces between living cells and semiconductors hinges on being able to obtain an extremely close and high surface-area contact, which preserves both cell viability and semiconductor performance. To accomplish this, we introduce organic semiconductor assemblies consisting of a hierarchical arrangement of nanocrystals. These are synthesised via a colloidal chemical route that transforms the nontoxic commercial pigment quinacridone into various biomimetic three-dimensional arrangements of nanocrystals.
View Article and Find Full Text PDFHydrogen-bonded organic semiconductor micro- and nanocrystals: from colloidal syntheses to (opto-)electronic devices.
J Am Chem Soc
November 2014
Institute of Semiconductor and Solid State Physics, #Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, ∇Institute of Organic Chemistry, and ∥Zentrum für Oberflächen und Nanoanalytik, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria.
Organic pigments such as indigos, quinacridones, and phthalocyanines are widely produced industrially as colorants for everyday products as various as cosmetics and printing inks. Herein we introduce a general procedure to transform commercially available insoluble microcrystalline pigment powders into colloidal solutions of variously sized and shaped semiconductor micro- and nanocrystals. The synthesis is based on the transformation of the pigments into soluble dyes by introducing transient protecting groups on the secondary amine moieties, followed by controlled deprotection in solution.
View Article and Find Full Text PDFAdsorption study and detection of the high performance organic pigments quinacridone and 2,9-dimethylquinacridone on Ag nanoparticles by surface-enhanced optical spectroscopy.
Langmuir
January 2014
Instituto de Estructura de la Materia, IEM-CSIC , Serrano 121, 28006 Madrid, Spain .
Article Synopsis
- The study utilized surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF) to investigate the adsorption and detection of the high-performance pigments quinacridone (QA) and 2,9-dimethylquinacridone (2,9-DMQA), which are important in various industries.
- SERS analysis revealed how these pigments interact with silver nanoparticles, while additional techniques like vibrational analysis and UV-vis spectroscopy were used to understand their properties and aggregation behaviors.
- Notably, 2,9-DMQA showed a lower tendency for aggregation compared to QA and had a detection limit of around 55 parts per billion (ppb) due to its unique molecular structure.
Silica cross-linked nanoparticles encapsulating fluorescent conjugated dyes for energy transfer-based white light emission and porphyrin sensing.
Nanoscale
September 2012
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China.
This work demonstrated that water-soluble fluorescent hybrid materials can be successfully synthesized by use of silica cross-linked micellar nanoparticles (SCMNPs) as scaffolds to encapsulate fluorescent conjugated dyes for pH sensing, porphyrin sensing and tunable colour emission. Three dyes were separately encapsulated inside SCMNPs (short to dye-SCMNPs). Each of the dye-SCMNPs indicated longer lifetime in water than that of free dye dissolved in organic solvent.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!