共查询到20条相似文献,搜索用时 0 毫秒
1.
Dr. Sidharam P. Pujari Dr. Luc Scheres Dr. Antonius T. M. Marcelis Prof. Dr. Han Zuilhof 《Angewandte Chemie (International ed. in English)》2014,53(25):6322-6356
The modification of surfaces by the deposition of a robust overlayer provides an excellent handle with which to tune the properties of a bulk substrate to those of interest. Such control over the surface properties becomes increasingly important with the continuing efforts at down‐sizing the active components in optoelectronic devices, and the corresponding increase in the surface area/volume ratio. Relevant properties to tune include the degree to which a surface is wetted by water or oil. Analogously, for biosensing applications there is an increasing interest in so‐called “romantic surfaces”: surfaces that repel all biological entities, apart from one, to which it binds strongly. Such systems require both long lasting and highly specific tuning of the surface properties. This Review presents one approach to obtain robust surface modifications of the surface of oxides, namely the covalent attachment of monolayers. 相似文献
2.
Dr. Euan R. Kay 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(31):10706-10716
Rational and generalisable methods for engineering surface functionality will be crucial to realising the technological potential of nanomaterials. Nanoparticle‐bound dynamic covalent exchange combines the error‐correcting and environment‐responsive features of equilibrium processes with the stability, structural precision, and vast diversity of covalent chemistry, defining a new and powerful approach for manipulating structure, function and properties at nanomaterial surfaces. Dynamic covalent nanoparticle (DCNP) building blocks thus present a whole host of possibilities for constructing adaptive systems, devices and materials that incorporate both nanoscale and molecular functional components. At the same time, DCNPs have the potential to reveal fundamental insights regarding dynamic and complex chemical systems confined to nanoscale interfaces. 相似文献
3.
4.
Ng CC Magenau A Ngalim SH Ciampi S Chockalingham M Harper JB Gaus K Gooding JJ 《Angewandte Chemie (International ed. in English)》2012,51(31):7706-7710
Smart surfaces presenting both antifouling molecules with a charged functional group at their distal end, and molecules that are terminated by RGD peptides for cell adhesion, were fabricated and characterized (see picture). By applying potentials of +300 or -300?mV, the surfaces could be dynamically switched to make the peptide accessible or inaccessible to cells. 相似文献
5.
采用电化学方法产生的H2Te为碲源(Te2-),快速合成了水溶性强荧光的CdTe量子点.该方法具有操作简单、安全、快速廉价和可大量制备等优点.合成过程中考察了合成温度,pH值和配体比例对制备CdTe量子点的影响.在最优化的实验条件下,电化学方法合成的巯基丙酸配位的CdTe荧光量子产率可达到55%;通过紫外可见光谱(UV... 相似文献
6.
In this paper, synchronous fluorescence scan (SFS) spectroscopy has been applied for the first time for the simultaneous determination of a mixture of CdTe fluorescent nanocrystals (NCs) of various sizes without a pre-separation step. It is observed that synchronous fluorescence maximum correlates well with the size of the nanocrystals, i.e.; the is useful to determine size dependency of NCs. Synchronous fluorescence maximum along with the second derivative can identify individual NCs in a mixture in water. The method is found to be simple, sensitive, selective and fast for NCs determination in aqueous media. 相似文献
7.
Kovalenko M. V. Bodnarchuk M. I. Stroyuk A. L. Kuchmii S. Ya. 《Theoretical and Experimental Chemistry》2004,40(4):220-225
Methods were developed for the synthesis of quantum-sized particles of CdTe, stabilized in aqueous solutions of thioglycolic acid, using H2Te or NaHTe produced in situ by electrochemical reduction of tellurium. The spectral and optical characteristics of the synthesized CdTe nanoparticles were studied. It was found that they have photocatalytic activity in the reduction of methylviologen with sodium sulfite. 相似文献
8.
9.
巯基乙胺稳定的水溶性CdTe纳米粒子的合成与表征 总被引:9,自引:0,他引:9
用巯基乙胺(cysteamine,CA)作为稳定剂,在水相中合成了发光可调的CdTe半导体纳米粒子。这些巯基乙胺稳定的CdTe纳米粒子表面带有大量的正电荷。实验结果表明,稳定剂与Cd的比例以及pH等实验条件对CdTe纳米粒子体系的荧光发射强度影响较大。在pH为6.1时,纳米粒子体系在橙红波段的荧光量子产率达到了9%左右。控制实验条件,合成了各种尺寸的CdTe纳米粒子,荧光发射光谱在520~600 nm范围连续可调。分别用X射线光电子能谱(XPS),透射电子显微镜(TEM),X射线衍射仪(XRD),红外吸收 相似文献
10.
Cohavi O Reichmann D Abramovich R Tesler AB Bellapadrona G Kokh DB Wade RC Vaskevich A Rubinstein I Schreiber G 《Chemistry (Weinheim an der Bergstrasse, Germany)》2011,17(4):1327-1336
Interactions of peptides and proteins with inorganic surfaces are important to both natural and artificial systems; however, a detailed understanding of such interactions is lacking. In this study, we applied new approaches to quantitatively measure the binding of amino acids and proteins to gold surfaces. Real‐time surface plasmon resonance (SPR) measurements showed that TEM1‐β‐lactamase inhibitor protein (BLIP) interacts only weakly with Au nanoparticles (NPs). However, fusion of three histidine residues to BLIP (3H‐BLIP) resulted in a significant increase in the binding to the Au NPs, which further increased when the histidine tail was extended to six histidines (6H‐BLIP). Further increasing the number of His residues had no effect on the binding. A parallel study using continuous (111)‐textured Au surfaces and single‐crystalline, (111)‐oriented, Au islands by ellipsometry, FTIR, and localized surface plasmon resonance (LSPR) spectroscopy further confirmed the results, validating the broad applicability of Au NPs as model surfaces. Evaluating the binding of all other natural amino acid homotripeptides fused to BLIP (except Cys and Pro) showed that aromatic and positively‐charged residues bind preferentially to Au with respect to small aliphatic and negatively charged residues, and that the rate of association is related to the potency of binding. The binding of all fusions was irreversible. These findings were substantiated by SPR measurements of synthesized, free, soluble tripeptides using Au‐NP‐modified SPR chips. Here, however, the binding was reversible allowing for determination of binding affinities that correlate with the binding potencies of the related BLIP fusions. Competition assays performed between 3H‐BLIP and the histidine tripeptide (3 His) suggest that Au binding residues promote the adsorption of proteins on the surface, and by this facilitate the irreversible interaction of the polypeptide chain with Au. The binding of amino acids to Au was simulated by using a continuum solvent model, showing agreement with the experimental values. These results, together with the observed binding potencies and kinetics of the BLIP fusions and free peptides, suggest a binding mechanism that is markedly different from biological protein–protein interactions. 相似文献
11.
H.K. Schmidt 《Journal of Sol-Gel Science and Technology》1997,8(1-3):557-565
Based on the concept of controlling the particle size by the surface free energy, the growth of sol-gel derived nanoparticles
(Al2O3, TiO2, ZrO2) has been investigated in presence of molecules with binding ability to the growing particles. The investigations show that
the use of silanes, carboxylic acid or β-diketones allows to replace electrostatic sol stabilisation by steric sol stabilisation
and through this, high solid content sols can be obtained. The introduction of these sols into orgaic or ormocer type of matrices
leads to nano composites with degrees of filling up to 40 wt.-% without agglomeration and with high optical quality. Already
developed TiO2 containing bulk materials, ultrahard coatings on plastic and adhesives for fiber to chip coupling are examples for the usefulness
of this alternative sol-gel route. The nanocomposite materials show interesting mechanical and thermomechanical properties
such as high hardness or low thermal expansion compared to unfilled systems. 相似文献
12.
13.
14.
在水溶液体系中制备出了具有高质量荧光性能,巯基乙酸(TGA)修饰的CdTe量子点(QDs),基于量子点与氯霉素混合后发生荧光猝灭作用,建立CdTe量子点作为荧光探针测定氯霉素的新方法。在Tris-HCl缓冲液(pH 7.00,0.10 mol·L-1)中,反应时间为10min时,氯霉素浓度在10~70μg·mL-1范围内与CdTe量子点的荧光猝灭程度呈良好的线性关系,相关系数为0.9981,检出限为0.799μg.mL-1。方法简便快速,灵敏度高,可用于实际样品中氯霉素的检测。 相似文献
15.
Li J Zhao K Hong X Yuan H Ma L Li J Bai Y Li T 《Colloids and surfaces. B, Biointerfaces》2005,40(3-4):179-182
Colloidal semiconductor nanocrystals have attracted considerable attention as a novel biological luminescent label. The bioinorganic conjugates of luminescent CdTe nanocrystals and protein, including CdTe/BSA (bovine serum albumin) and CdTe/MAB (mouse monoclonal antibody against hepatities B surface antigen), were formed via electrostatic/coordination self-assembly. Pure CdTe nanocrystals, CdTe/BSA and CdTe/MAB were used in the immunochromatographic assay experiments, respectively. And the results indicated that CdTe nanocrystals could be used and developed as a novel label with good stability, high sensitivity and facile determination of several analytes in immunochromatographic assay strips. 相似文献
16.
17.
18.
19.