Funding for this research was provided by the Italian Ministry of Health under the frame of EuroNanoMed II (European Innovative Research &amp; Technological Development Projects in Nanomedicine, project title: ''InNaSERSS'').

Altın nanorods 1. sentezi Not: boyunca yüksek düzeyde saflaştırılmış su kullanın. <ol><li> Altın tohumların hazırlanması <ol><li> Çözelti berrak hale gelinceye kadar 40 ° C &#39;de ultrasonikasyon altında 5 ml su içinde heksadesiltrimetilamonyum bromit (CTAB) ve 364,4 mg çözülür. CTAB Çözelti oda sıcaklığına soğumaya bırakın. </li><li> Ayrıca, su (0.5 mm) içinde tetrakloro asit (HAuCl 4) 5 ml hazırlar. </li><li> 27 ° C sıcaklık sabit tutularak kuvvetlice manyetik karıştırma altında CTAB çözeltisine HAuCl 4 solüsyonu ekleyin. </li><li> Sodyum borohidrid, 600 ul (NaBH4), 4 ° C &#39;de su (10 mM)&#39; de çözelti hazırlayın. kuvvetlice karıştırarak karışıma Bu çözüm ekleyin. Solüsyonun renk hemen kahverengimsi sarıdan değişir olmadığını kontrol edin. </li><li> Kullanmadan önce süspansiyonu 20 dakika boyunca karıştırın. Oda sıcaklışında artık 24 den saat tohumları süspansiyon MağazaTure. </li><li> UV-Vis spektrofotometre kullanılarak tohum boyutlarını kontrol edin. Tohumlar kadar (yaklaşık 2 nm) küçük UV-görünür spektroskopi ile altın nanoçubuklar hazırlanmasında kullanılmak üzere emin olun. Not: Spektrum Şekil 1 &#39;de bildirilmiştir ne benzer olmalıdır kullanılmamalıdır 505-520 nm civarında plasmonik tepe varlığı ile tanımlanan daha büyük tohumlar, küresel nanopartiküller üretmek için muhtemeldir.. </li></ol></li><li> Altın nanoçubuklar ve &quot;büyüme çözüm&quot; hazırlanması. <ol><li> ultrasonikasyon kullanılarak 40 ° C de, 5 ml su içinde 22 mg hidrokinon ile birlikte 182.2 mg CTAB eritin. 27 ° C&#39;ye kadar çözüm serinleyin. </li><li> 4 mM gümüş nitrat (iyodinin 3) çözeltisi 200 ul hazırlayın. </li><li> Ayrıca, tetrakloro asit, 1 mM çözeltisinin 5 ml (HAuCl 4) maddesinin hazırlanması. </li><li> İlk adımda 1.2.2 hazırlanan gümüş nitrat çözeltisi ekleyin. Daha sonra, HAuC eklemel 4 çözüm manyetik karıştırma altında adım 1.2.1 hazırlanan CTAB ve hidrokinon çözümü için adım 1.2.3 hazırladı. </li><li> Hemen sonra, daha önce protokole göre hazırlandı tohum süspansiyonu 12 ul adım 1.1 rapor manyetik karıştırma altında ilave edin ve reaksiyonu başlangıç ​​sağlar. Süspansiyon yaklaşık 30 dakika içinde renk değiştiren olmadığını kontrol edin. </li><li> , 4. bölümde her 5 dakikada anlatıldığı gibi, süspansiyonun UV-görünür spektrum kontrol ederek nanoçubuklar oluşumunu kontrol eder. spektrum stabil olana kadar devam edin. Nanoçubuklar tam oluşumuna izin vermek için, 30 dakika daha (Şekil 2) için karıştırma altında süspansiyon bırakın. </li><li> 10 dakika için 10,000 x g&#39;de tüpler içinde süspansiyonu (her bir tüp için süspansiyon 1 mi) ve santrifüj bölün. Altın nanorods tüpün altındaki koyu bir çökelti oluşturur. </li><li> 1 ml su, her tüp bir çökelti yeniden süspanse edin. tüplerin içeriği karıştırın ve susp saklamakOda sıcaklığında altın nanoçubuklar bir ension. </li><li> Bölüm 4 (Şekil 3) açıklandığı gibi UV-görünür bölge spektroskopisi ve transmisyon elektron mikroskobu ile elde edilen nanorods karakterize. </li></ol></li></ol> Ag + iyonlarının konsantrasyonu değiştirilerek nanorods 2. Tuning Boy Oranı <ol><li> 3.4 mg agno su 3 5 ml eritilmesi, 4 mM konsantrasyonda bir gümüş nitrat solüsyonu hazırlayın. </li><li> bölüm 1.2.1&#39;de tarif edildiği gibi, üç farklı şişeler CTAB ile çözeltisi ve hidrokinon içinde hazırlanması ve sırasıyla, 100 ul, 150 ul veya gümüş nitrat çözeltisi 200 ul ekle. </li><li> 1.2.3 adıma ve nokta 1.2.5 den açıklandığı gibi altın nanoçubuklar hazırlanmasına devam etmek HAuCl 4 çözeltisi hazırlanmıştır Kullanıma göre ekleyin. </li><li> UV-görünür spektroskopi ve transmisyon elektron mikroskobu ile elde edilen nanorods karakterize. Ag + alt miktarda küçük şişeler tekrar edecektirkısa nanoçubuklar lara yol (2 ve 2.2 arasında en-boy oranı, sırasıyla) (Şekil 4). </li></ol> 3. CTAB konsantrasyonu değiştirilerek nanorods Aspect Oranı Tuning <ol><li> &quot;Büyüme çözüm&quot; de CTAB farklı konsantrasyonları ile altın nanoçubuklar farklı gruplar hazırlayın. 100 mM ila 10 mM arasında kullanımlar konsantrasyonları farklı boyut ve en boy oranına sahip olan, altın nanorods üretmek. Her bir deneyde kullanılan CTAB konsantrasyonları kullanılan miligram karşılık gelen miktarı ile Tablo 1 &#39;de özetlenmiştir. 5 ml su içindeki hidrokuinonun 22 mg zaman CTAB farklı miktarlarda eritin. </li><li> Gümüş nitrat çözeltisi 200 ul ekle (hazır 1.2.2 aşamasına göre) ve manyetik çalkalama altına her şişede (adım 1.2.3 tarif kadar göre hazırlandı) HAuCl 4 çözeltisi 5 mi. </li><li> tohum süspansiyonu 12 ul ekle ve son karışımın renk değişimi dikkate alınmalıdır. </li><li> Durtakım, renk ve UV-görünür spektrum stabilize edilmektedir karıştırma işlemi; tepkime süresi büyüme çözeltisi içinde CTAB konsantrasyonuna bağlıdır. </li><li> su içinde, 10 dakika ve tekrar süspansiyon için 10,000 x g&#39;de santrifüjleyin. </li><li> UV-görünür spektroskopi ve transmisyon elektron mikroskobu ile elde edilen nanorods karakterize. daha yüksek bir konsantrasyonu uzun ancak daha büyük nanorods verecek süre CTAB daha düşük bir konsantrasyonu, daha kısa nanoçubuklar neden olur. Aksine nanoçubuklar en-boy oranı 40-50 mm civarında aralığında daha yüksek olacaktır ve daha düşük ve daha yüksek konsantrasyonlarda (Şekil 5 ve Şekil 6) her iki azalır. </li></ol> Altın nanorods 4. Karakterizasyonu <ol><li> UV-görünür spektroskopisi <ol><li> Plastik mikro-küvete su 400 ul nanorods çözeltisi 100 ul seyreltilir ve UV-görünür bölge spektrum elde (dalga boyu aralığı 400 nm ila 840)üreticinin protokolüne göre yöntem. </li><li> reaksiyonun kinetiğini incelemek amacıyla büyüme solüsyonu her 5 dk UV-görünür spektrumları (dalga boyu aralığı 400 ile 840 nm) toplayın. </li></ol></li><li> Transmisyon Elektron Mikroskobu (TEM) <ol><li> boyut ölçümü için, elde edilen nanoçubuklar en-boy oranı, nanoçubuklar her numunenin TEM görüntüleri toplayın. ultra ince Formvar kaplı 200 meşlik bakır ızgaralar üzerine süspansiyon (4 ul), bir damla yerleştirerek örnekleri hazırlamak ve 4 ° C &#39;de hava içinde kurumaya bırakın. üreticinin protokolüne göre 200 kV bir hızlandırma gerilimi kullanarak TEM de örnek analiz edin. </li></ol></li></ol>

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The authors have nothing to disclose.

Burada sunulan protokol altın nanorods üretmek için hidrokinon, zayıf bir azalma potansiyeli ile karakterize bir aromatik molekülü geçerlidir. Askorbik asit kullanımına dayalı en yaygın kullanılan sentetik rota doğru mevcut protokolün iki ana avantajı vardır: İlk hidrokinon hemen hemen kantitatif altın nanoçubuklar yüksek miktarda üretim sağlayan altın iyonlarını azaltmak mümkün olmasıdır 11 BS. Radikaller, CTAB daha düşük bir miktarda ve maliyetlerin daha sonra önemli bir aza...

Altın nanopartiküller (AuNPs) biyomedikal uygulamalarda kullanılmak üzere en yaygın ve gelecek vaat eden nano bulunmaktadır. Bunların kullanımı vitro teşhis ürünlerinde nokta-bakım birçok esastır 1. Başka farklı bir dizi uygulamalar için etkin bir araç olarak önerilmiştir. Görüntüleme çalışmaları bir kontrast maddesi olarak, 2, bir ilaç verme sistemi olarak 3 gibi ışık kaynaklı termoterapinin (veya fototermal terapi) için ilaçlar. 4. AuNPs büyük potansiyel son yirmi yılda, tahrik vardır, büyüklüğüne kontrolünü arttırmak ve elde edilen şekil yapabiliyor yeni sentez geliştirme yoğun araştırmalar. 5 AuNPs çeşitleri özel uygulamalar için diğerlerine göre daha uygundur, aslında olmasıdır. Farklı altın nano arasında, altın nanorods (AuNRs) en ilginç sistemlerinden biri olarak ortaya çıkmıştır. AuNRs iki plasmo ile karakterize edilirboyuna ve enine eksen boyunca elektronların salınım ile ilişkili nic dorukları sırasıyla. 6. çubuklar boy oranına bağlı olarak, en yoğun uzunlamasına tepe pozisyonu tam 620 ila 800 nm ayarlı olabilir özellikle önemlidir . Bu bölge insan dokuları neredeyse AuNPs içeren in vivo fotonik uygulamaları bir dizi gelişimini sağlayan, ışığı absorbe yoktur biyolojik pencere, 7 eşleşir. Nanoyapıların bu tür büyük bir ilgi olmasına rağmen, AuNRs hazırlanması için sentetik protokoller çeşitli sınırlamalar muzdarip. Pek çok durumda, nanorods Sau ve çalışma arkadaşları tarafından geliştirilen iki aşamalı bir yönteme uygun olarak hazırlanır. 8 kendi protokol, nanorods önceden oluşturulmuş altın tohumu, gümüş iyonları ve büyük bir miktarının varlığında, askorbik asit, altın iyonları indirgeyici sentezlenir heksadesil-trimetilamonyum bromür (CTAB), ACationic lineer yüzey aktif madde. Bu protokolün dezavantajı altın iyonları azaltma verimi görece düşük olduğu (yaklaşık% 20) 9 ve olduğunu CTAB, sentez reaktifler için toplam maliyetin yarısından fazlasını oluşturan pahalı bir reaktif yüksek miktarda olduğunu, gereklidir. yeni ve daha etkili bir sentetik yol gelişimi AuNRs göre biyomedikal yaklaşımlar yayılmasını sağlayan önemli bir ihtiyaç olduğu oradan kabul edilir. Bu yazının ilk bölümünde, yaklaşık üç boy oranına sahip AuNR hazırlanması için optimize edilmiş bir protokol mevcut. Sentez hafif indirgeme maddesi olarak hidrokinon kullanımına dayanmaktadır ve CTAB azaltılmış miktarda kullanarak, altın iyonları neredeyse niceliksel azalma AuNR hazırlanmasına olanak vermektedir. 10 AuNRs hazırlanması için bu protokol, temel almaktadır altın tohumları &quot;büyüme, sol içinde kullanılan iki basamaklı bir yaklaşımıKatkı &quot;. İkinci bölümde ise, biz iki şekilde ayar elde AuNR boyutu ve boy oranı ince nasıl gösterir. askorbik asit dayalı standart protokole benzer ilk yolu, &quot;büyüme çözüm&quot; mevcut gümüş iyonları miktarı değişir etmektir. İkinci yol, iyi tanımlanmış, kısa nanorods elde etmek üzere (firma tarafından, kritik misel konsantrasyonuna yakın) 10 mM&#39;lik bir konsantrasyona kadar düşürülebilir CTAB miktarının değişimi dayanır.

<table><tbody><tr><td>Gold(III) chloride trihydrate</td><td>Sigma Aldrich</td><td>520918</td><td></td></tr><tr><td>Hydroquinone</td><td>Sigma Aldrich</td><td>H17902</td><td></td></tr><tr><td>Silver Nitrate</td><td>Sigma Aldrich</td><td>209139</td><td>toxic</td></tr><tr><td>Sodium Borohydride</td><td>Sigma Aldrich</td><td>480886</td><td></td></tr><tr><td>Hexadecyltrimethylammonium bromide (CTAB)</td><td>Sigma Aldrich</td><td>H5882</td><td>Acute Tox. (oral). In this study we tested three different batches of CTAB (H5882) from Sigma Aldrich. Two of them were marked as made in China while one as made in India. In our experience only the batches marked as made in China were effective for the preparation of AuNR.</td></tr><tr><td>Spectrophotometer</td><td>Thermo scientific&amp;nbsp;</td><td>Nanodrop 2000C</td><td></td></tr><tr><td>TEM</td><td>JEOL</td><td>2100</td><td></td></tr></tbody></table>

hydroquinone based synthesis of gold nanorods

Gold nanorods are an important kind of nanoparticles characterized by peculiar plasmonic properties. Despite their widespread use in nanotechnology, the synthetic methods for the preparation of gold nanorods are still not fully optimized. In this paper we describe a new, highly efficient, two-step protocol based on the use of hydroquinone as a mild reducing agent. Our approach allows the preparation of nanorods with a good control of size and aspect ratio (AR) simply by varying the amount of hexadecyl trimethylammonium bromide (CTAB) and silver ions (Ag+) present in the "growth solution". By using this method, it is possible to markedly reduce the amount of CTAB, an expensive and cytotoxic reagent, necessary to obtain the elongated shape. Gold nanorods with an aspect ratio of about 3 can be obtained in the presence of just 50 mM of CTAB (versus 100 mM used in the standard protocol based on the use of ascorbic acid), while shorter gold nanorods are obtained using a concentration as low as 10 mM.

Altın tohumları Görülür UV spektrumu Şekil 1 &#39;de görülebilir. Altın tohumları enjeksiyondan sonra farklı zamanlarda elde edilen UV-görünür spektrumu aşağıda Şekil sunulmuştur 2. Görülür UV spektrumlan ve transmisyon elektron mikroskobu (TEM) görüntüleri elde altın nanoçubuklar arasında Şekilde gösterilmiştir 3., gümüş iyonları miktarı değiştirilerek elde edilen f...

Watch this Scientific Journal Video about Hydroquinone Based Synthesis of Gold Nanorods at JoVE.com

Hydroquinone Based Synthesis of Gold Nanorods

Bu çalışma, indirgeyici ajan olarak hidrokinon kullanımına göre altın nanoçubuklar sentezi için bir protokol, artı boyutlarını ve en boy oranının kontrol edilmesi için farklı mekanizmaları tarif eder.

Altın nanorods hidrokinon Esaslı Sentezi

Gold nanorods are an important kind of nanoparticles characterized by peculiar plasmonic properties. Despite their widespread use in nanotechnology, the ...

hydroquinone-based-synthesis-of-gold-nanorods

Universidad de Cartagena UDEC

Research

JoVE Journal

Chemistry

13.6K Görüntüleme.  Fondazione Don Carlo Gnocchi ONLUS (Don Carlo Gnocchi Foundation).  Bu çalışma, indirgeyici ajan olarak hidrokinon kullanımına göre altın nanoçubuklar sentezi için bir protokol, artı boyutlarını ve en boy oranının kontrol edilmesi için farklı mekanizmaları tarif eder. 

Video: Hydroquinone Based Synthesis of Gold Nanorods

Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance

A nearly parallel array of pores can be produced by anodizing aluminum foils in acidic environments1, 2. Applications of anodic aluminum oxide (AAO) membranes have been under development since the 1990's and have become a common method to template the synthesis of high aspect ratio nanostructures, mostly by electrochemical growth or pore-wetting. Recently, these membranes have become commercially available in a wide range of pore sizes and densities, leading to an extensive library of functional nanostructures being synthesized from AAO membranes. These include composite nanorods, nanowires and nanotubes made of metals, inorganic materials or polymers 3-10. Nanoporous membranes have been used to synthesize nanoparticle and nanotube arrays that perform well as refractive index sensors, plasmonic biosensors, or surface enhanced Raman spectroscopy (SERS) substrates 11-16, as well as a wide range of other fields such as photo-thermal heating 17, permselective transport 18, 19, catalysis 20, microfluidics 21, and electrochemical sensing 22, 23. Here, we report a novel procedure to prepare gold nanotubes in AAO membranes. Hollow nanostructures have potential application in plasmonic and SERS sensing, and we anticipate these gold nanotubes will allow for high sensitivity and strong plasmon signals, arising from decreased material dampening 15.

Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.

Şablon Ayarlanabilir IR Absorbans ile plasmonik Altın Nanotüpler Sentez Yönetmen

A nearly parallel array of pores can be produced by anodizing aluminum foils in acidic environments1, 2. Applications of anodic aluminum oxide (AAO) ...

Kimya

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest in using nano-colloids for photo-thermal ablation, drug delivery and many other biomedical applications 6. Gold is particularly used because of its low toxicity 7-9. A property of metal nano-colloids is that they can have a strong surface plasmon resonance 10. The peak of the surface plasmon resonance mode depends on the structure and composition of the metal nano-colloids. Since the surface plasmon resonance mode is stimulated with light there is a need to have the peak absorbance in the near infrared where biological tissue transmissivity is maximal 11, 12.
We present a method to synthesize star shaped colloidal gold, also known as star shaped nanoparticles 13-15 or nanostars 16. This method is based on a solution containing silver seeds that are used as the nucleating agent for anisotropic growth of gold colloids 17-22. Scanning electron microscopy (SEM) analysis of the resulting gold colloid showed that 70 % of the nanostructures were nanostars. The other 30 % of the particles were amorphous clusters of decahedra and rhomboids. The absorbance peak of the nanostars was detected to be in the near infrared (840 nm). Thus, our method produces gold nanostars suitable for biomedical applications, particularly for photo-thermal ablation.

We synthesized star shaped gold nanostars using a silver seed mediated growth method. The diameter of the nanostars ranges from 200 to 300 nm and the number of tips vary from 7 to 10. The nanoparticles have a broad surface plasmon resonance mode centered in the near infrared.

Gümüş Tohum aracılığı Büyüme Yöntemi ile Altın Nanostar Sentezi

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest ...

Biyomühendislik

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Plasmonic nanoparticles are an attractive material for light harvesting applications due to their easily modified surface, high surface area and large extinction coefficients which can be tuned across the visible spectrum. Research into the plasmonic enhancement of optical transitions has become popular, due to the possibility of altering and in some cases improving photo-absorption or emission properties of nearby chromophores such as molecular dyes or quantum dots. The electric field of the plasmon can couple with the excitation dipole of a chromophore, perturbing the electronic states involved in the transition and leading to increased absorption and emission rates. These enhancements can also be negated at close distances by energy transfer mechanism, making the spatial arrangement of the two species critical. Ultimately, enhancement of light harvesting efficiency in plasmonic solar cells could lead to thinner and, therefore, lower cost devices. The development of hybrid core/shell particles could offer a solution to this issue. The addition of a dielectric spacer between a gold nanoparticles and a chromophore is the proposed method to control the exciton plasmon coupling strength and thereby balance losses with the plasmonic gains. A detailed procedure for the coating of gold nanoparticles with CdS and ZnS semiconductor shells is presented. The nanoparticles show high uniformity with size control in both the core gold particles and shell species allowing for a more accurate investigation into the plasmonic enhancement of external chromophores.

The synthesis of uniform gold nanoparticles coated with semiconductor shells of CdS or ZnS is performed. The semiconductor coating is conducted by first depositing a silver sulfide shell and exchanging the silver cations for zinc or cadmium cations.

Sentezi, Karakterizasyonu ve Hibrid Au / CdS ve Au / ZnS Çekirdek / Shell Nanopartiküller işlevselleştirilmesi

Plasmonic nanoparticles are an attractive material for light harvesting applications due to their easily modified surface, high surface area and large ...

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Reducing dilute aqueous HAuCl4 with sodium thiocyanate (NaSCN) under alkaline conditions produces 2 to 3 nm diameter nanoparticles. Stable grape-like oligomeric clusters of these yellow nanoparticles of narrow size distribution are synthesized under ambient conditions via two methods. The delay-time method controls the number of subunits in the oligoclusters by varying the time between the addition of HAuCl4 to alkaline solution and the subsequent addition of reducing agent, NaSCN. The yellow oligoclusters produced range in size from ~3 to ~25 nm. This size range can be further extended by an add-on method utilizing hydroxylated gold chloride (Na+[Au(OH4-x)Clx]-) to auto-catalytically increase the number of subunits in the as-synthesized oligocluster nanoparticles, providing a total range of 3 nm to 70 nm. The crude oligocluster preparations display narrow size distributions and do not require further fractionation for most purposes. The oligoclusters formed can be concentrated &#62;300 fold without aggregation and the crude reaction mixtures remain stable for weeks without further processing. Because these oligomeric clusters can be concentrated before derivatization they allow expensive derivatizing agents to be used economically. In addition, we present two models by which predictions of particle size can be made with great accuracy.

We describe a simple method for producing highly stable oligomeric clusters of gold nanoparticles via the reduction of chloroauric acid (HAuCl4) with sodium thiocyanate (NaSCN). The oligoclusters have a narrow size distribution and can be produced with a wide range of sizes and surface coats.

Ortam Koşullarında Altın Nanopartiküller Kararlı Oligomerik Kümeleri Boyut Kontrollü Sentezi için Basit Bir Yöntem

Reducing dilute aqueous HAuCl4 with sodium thiocyanate (NaSCN) under alkaline conditions produces 2 to 3 nm diameter nanoparticles. Stable grape-like ...

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs within the interlayer space of semiconducting layered titania nanosheet (TNS) films was investigated here. Two types of intermediate films (i.e., TNS films containing methyl viologen (TNS/MV2+) and 2-ammoniumethanethiol (TNS/2-AET+)) were prepared. The two intermediate films were soaked in an aqueous tetrachloroauric(III) acid (HAuCl4) solution, whereby considerable amounts of Au(III) species were accommodated within the interlayer spaces of the TNS films. The two types of obtained films were then soaked in an aqueous sodium tetrahydroborate (NaBH4) solution, whereupon the color of the films immediately changed from colorless to purple, suggesting the formation of AuNPs within the TNS interlayer. When only TNS/MV2+ was used as the intermediate film, the color of the film gradually changed from metallic purple to dusty purple within 30 min, suggesting that aggregation of AuNPs had occurred. In contrast, this color change was suppressed by using the TNS/2-AET+ intermediate film, and the AuNPs were stabilized for over 4 months, as evidenced by the characteristic extinction (absorption and scattering) band from the AuNPs.

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

Here, we present a protocol for the in situ synthesis of gold nanoparticles (AuNPs) within the interlayer space of layered titanate films without the aggregation of AuNPs. No spectral change was observed even after 4 months. The synthesized material has expected applications in catalysis, photo-catalysis, and the development of cost-effective plasmonic devices.

Katmanlı Titanate Şeffaf Filmleri Interlayers Uzayda Toplama olmadan Altın Nanopartiküller Yerinde Sentez

Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs ...

Mühendislik

Synthesis and Characterization of Amphiphilic Gold Nanoparticles

Gold nanoparticles covered with a mixture of 1-octanethiol (OT) and 11-mercapto-1-undecane sulfonic acid (MUS) have been extensively studied because of their interactions with cell membranes, lipid bilayers, and viruses. The hydrophilic ligands make these particles colloidally stable in aqueous solutions and the combination with hydrophobic ligands creates an amphiphilic particle that can be loaded with hydrophobic drugs, fuse with the lipid membranes, and resist nonspecific protein adsorption. Many of these properties depend on nanoparticle size and the composition of the ligand shell. It is, therefore, crucial to have a reproducible synthetic method and reliable characterization techniques that allow the determination of nanoparticle properties and the ligand shell composition. Here, a one-phase chemical reduction, followed by a thorough purification to synthesize these nanoparticles with diameters below 5 nm, is presented. The ratio between the two ligands on the surface of the nanoparticle can be tuned through their stoichiometric ratio used during synthesis. We demonstrate how various routine techniques, such as transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), and ultraviolet-visible (UV-Vis) spectrometry, are combined to comprehensively characterize the physicochemical parameters of the nanoparticles.

Amphiphilic gold nanoparticles can be used in many biological applications. A protocol to synthesize gold nanoparticles coated by a binary mixture of ligands and a detailed characterization of these particles is presented.

Amphiphilik altın nanopartiküller sentezi ve karakterizasyonu

Gold nanoparticles covered with a mixture of 1-octanethiol (OT) and 11-mercapto-1-undecane sulfonic acid (MUS) have been extensively studied because of ...

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

The inherent addressability of DNA origami structures makes them ideal templates for the arrangement of metal nanoparticles into complex plasmonic nanostructures. The high spatial precision of a DNA origami-templated assembly allows controlling the coupling between plasmonic resonances of individual particles and enables tailoring optical properties of the constructed nanostructures. Recently, chiral plasmonic systems attracted a lot of attention due to the strong correlation between the spatial configuration of plasmonic assemblies and their optical responses (e.g., circular dichroism [CD]). In this protocol, we describe the whole workflow for the generation of DNA origami-based chiral assemblies of gold nanorods (AuNRs). The protocol includes a detailed description of the design principles and experimental procedures for the fabrication of DNA origami templates, the synthesis of AuNRs, and the assembly of origami-AuNR structures. In addition, the characterization of structures using transmission electron microscopy (TEM) and CD spectroscopy is included. The described protocol is not limited to chiral configurations and can be adapted for the construction of various plasmonic architectures.

We describe the detailed protocol for the DNA origami-based assembly of gold nanorods into chiral plasmonic metamolecules with strong chiroptical responses. The protocol is not limited to chiral configurations and can be easily adapted for the fabrication of various plasmonic architectures.

Altın Nanorods bütünleştirilmiş koda kiral Plazmonik Metamolecules DNA Origami şablonlarını kullanma

The inherent addressability of DNA origami structures makes them ideal templates for the arrangement of metal nanoparticles into complex plasmonic ...

Preparation and Photoacoustic Analysis of Cellular Vehicles Containing Gold Nanorods

Gold nanorods are attractive for a range of biomedical applications, such as the photothermal ablation and the photoacoustic imaging of cancer, thanks to their intense optical absorbance in the near-infrared window, low cytotoxicity and potential to home into tumors. However, their delivery to tumors still remains an issue. An innovative approach consists of the exploitation of the tropism of tumor-associated macrophages that may be loaded with gold nanorods in vitro. Here, we describe the preparation and the photoacoustic inspection of cellular vehicles containing gold nanorods. PEGylated gold nanorods are modified with quaternary ammonium compounds, in order to achieve a cationic profile. On contact with murine macrophages in ordinary Petri dishes, these particles are found to undergo massive uptake into endocytic vesicles. Then these cells are embedded in biopolymeric hydrogels, which are used to verify that the stability of photoacoustic conversion of the particles is retained in their inclusion into cellular vehicles. We are confident that these results may provide new inspiration for the development of novel strategies to deliver plasmonic particles to tumors.

We show the preparation and address the feasibility of cellular vehicles containing gold nanorods for the photoacoustic imaging of cancer.

Altın nanorods İçeren Hücresel Araçların Hazırlama ve foto akustik Analizi

Gold nanorods are attractive for a range of biomedical applications, such as the photothermal ablation and the photoacoustic imaging of cancer, thanks to ...

Gold Nanoparticle Synthesis

Gold nanoparticles (Au nanoparticles) that are ~12 nm in diameter were synthesized by rapidly injecting a solution of 150 mg (0.15 mmol) of tetrachloroauric acid in 3.0 g (3.7 mmol, 3.6 mL) of oleylamine (technical grade) and 3.0 mL of toluene into a boiling solution of 5.1 g (6.4 mmol, 8.7 mL) of oleylamine in 147 mL of toluene. While boiling and mixing the reaction solution for 2 hours, the color of the reaction mixture changed from clear, to light yellow, to light pink, and then slowly to dark red. The heat was then turned off, and the solution was allowed to gradually cool down to room temperature for 1 hour. The gold nanoparticles were then collected and separated from the solution using a centrifuge and washed three times; by vortexing and dispersing the gold nanoparticles in 10 mL portions of toluene, and then precipitating the gold nanoparticles by adding 40 mL portions of methanol and spinning them in a centrifuge. The solution was then decanted to remove any remaining byproducts and unreacted starting materials. Drying the gold nanoparticles in a vacuum environment produced a solid black pellet; which could be stored for long periods of time (up to one year) for later use, and then redissolved in organic solvents such as toluene.

A protocol for synthesizing ~12 nm diameter gold nanoparticles (Au nanoparticles) in an organic solvent is presented. The gold nanoparticles are capped with oleylamine ligands to prevent agglomeration. The gold nanoparticles are soluble in organic solvents such as toluene.

Altın Nanopartikül Sentezi

Gold nanoparticles (Au nanoparticles) that are ~12 nm in diameter were synthesized by rapidly injecting a solution of 150 mg (0.15 mmol) of ...

Synthesis of Functionalized 10-nm Polymer-coated Gold Particles for Endothelium Targeting and Drug Delivery

Gold nanoparticles (AuNPs) have been used extensively in medical research due to their size, biocompatibility, and modifiable surface. Specific targeting and drug delivery are some of the applications of these AuNPs, but endothelial extracellular matrices&#39; defensive properties hamper particle uptake. To address this issue, we describe a synthesis method for ultrasmall gold nanoparticles to improve vascular delivery, with customizable functional groups and polymer lengths for further adjustments. The protocol yields 2.5 nm AuNPs that are capped with tetrakis(hydroxymethyl)phosphonium chloride (THPC). The replacement of THPC with hetero-functional polyethylene glycol (PEG) on the surface of the AuNP increases the hydrodynamic radius to 10.5 nm while providing various functional groups on the surface. The last part of the protocol includes an optional addition of a fluorophore to allow the AuNPs to be visualized under fluorescence to track nanoparticle uptake. Dialysis and lyophilization were used to purify and isolate the AuNPs. These fluorescent nanoparticles can be visualized in both in vitro and in vivo experiments due to the biocompatible PEG coating and fluorescent probes. Additionally, the size range of these nanoparticles render them an ideal candidate for probing the glycocalyx without disrupting normal vasculature function, which may lead to improved delivery and therapeutics.

We describe a method of synthesizing biocompatible 10-nm gold nanoparticles, functionalized by coating poly-ethylene glycol onto the surface. These particles can be used in vitro and in vivo for delivering therapeutics to nanoscale cellular and extracellular spaces that are difficult to access with conventional nanoparticle sizes.

Endotel hedefleme için Functionalized 10-nm polimer kaplı altın parçacıkları ve ilaç dağıtım sentezi

Gold nanoparticles (AuNPs) have been used extensively in medical research due to their size, biocompatibility, and modifiable surface. Specific targeting ...