Tag Archives: silica

BSB Nanotechnology, silicon dioxide nanoparticles (SiO2), and Dow

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Silicon dioxide (a form of silicon) is more commonly known as silica. There are problems with our use of *silica and so it was interesting to see this announcement (from a September 21, 2022 Dow news release on csiwire.com),

MIDLAND, Mich., September 21, 2022 /CSRwire/ – Dow (NYSE: Dow) announced a new engagement with BSB Nanotechnology Joint Stock Company, the world’s first producer of premium rice husk-based specialty silica. Rice husk, a renewable resource produced as a waste product of rice milling, is used for a plethora of diverse applications in the personal care market. This engagement helps accelerate Dow’s commitment towards a bio-based offering. The newly added ingredient – sold under the Dow trademark EcoSmooth™ Rice Husk Cosmetic Powder – delivers optical benefits and a unique sensorial experience for consumers in skin care, hair care and color cosmetic applications.

“Dow’s partnership with BSB Nanotechnology shines a light on how we continue to deliver on our commitment to transition towards a circular and low-carbon personal care offering while fostering valuable relationships with industry trailblazers,” said Isabel Almiro do Vale, global marketing and strategy director for Dow Personal Care. “This partnership is another significant milestone allowing Dow to expand its portfolio of products that enable eco-conscious claims, prioritizing solutions that deliver high-quality, benefits backed by science.”

The product of choice for the eco-conscious consumer, the EcoSmooth™ Rice Husk Cosmetic Powder is the exclusive ingredient to make its debut between the two parties. Compiled from non-GMO natural sources, this silica powder is upcycled from rice husk, a by-product from agriculture. It delivers a smooth feel combined with optical benefits like blurring imperfections and mattifying skin.

“This agreement signifies not only the first step towards a collaboration between Dow and BSB in the personal care sector but has also opened new pathways to other business sectors within Dow where BSB’s bio-based rice husk silica can offer sustainability and multifunctionality,” said Hung Nguyen, CEO of BSB. “BSB will continue to create more innovative and green solutions for the world and offer these additives through global partners like Dow.”

About Dow Personal Care Solutions

Dow Personal Care offers unique, innovative ingredients that empower customers around the world to create products with exceptional performance and exciting benefits that consumers can trust and believe in. Consumers that seek the confidence of a healthy appearance can see and feel the difference in our products through their lustrous hair or radiant and protected skin. We leverage our understanding of customer needs, deep market knowledge and technical expertise—combined with one of the broadest portfolios of technologies—to deliver personal care solutions with outstanding performance that are safe for people and the planet. We foster these innovations on global and local levels to meet the needs of diverse consumers through business centers, research and development (R&D), manufacturing plants and customer applications centers around the world. Please visit for more information.

About Dow

Dow (NYSE: DOW) combines global breadth; asset integration and scale; focused innovation and materials science expertise; leading business positions; and environmental, social and governance (ESG) leadership to achieve profitable growth and deliver a sustainable future. The Company’s ambition is to become the most innovative, customer centric, inclusive and sustainable materials science company in the world. Dow’s portfolio of plastics, industrial intermediates, coatings and silicones businesses delivers a broad range of differentiated, science-based products and solutions for its customers in high-growth market segments, such as packaging, infrastructure, mobility and consumer applications. Dow operates 104 manufacturing sites in 31 countries and employs approximately 35,700 people. Dow delivered sales of approximately $55 billion in 2021. References to Dow or the Company mean Dow Inc. and its subsidiaries. For more information, please visit www.dow.com or follow @DowNewsroom on Twitter.

About BSB Nanotechnology

BSB Nanotechnology Joint Stock Company, an established multi-faceted business, forayed into the rice world through the formulation of rice-based milk, a widely popular beverage in Vietnam. Strategically located in the Mekong Delta, the rice basket of Vietnam, BSB Nanotech taps into the country’s position as the 5th largest rice producer to access the main ingredient to its healthy beverage product. While feeding this nutritious gift of nature to the people of Vietnam, BSB Nanotech was presented with large amounts of rice husk, a waste product of rice milling. Building upon the business principle of reducing waste by reuse, BSB Nanotech has embarked on a journey to discover and create the value that rice husk could offer through its range of premium rice husk silica under the brand Biosilico. For more information, visit www.biosilico.vn .

I’m quite taken with BSB Nanotechnology’s Biosilico About page,

THE JOURNEY FROM ASH TO CASH

BSB Nanotechnology Joint Stock Company, an established multi-faceted business, forayed into the rice world through the formulation of rice-based milk, a widely popular beverage in Vietnam. Strategically located in the Mekong Delta, the rice basket of Vietnam, BSB Nanotech taps into the country’s  position as the 5th largest rice producer to access the main ingredient to its healthy beverage product. While feeding this nutritious gift of nature to the people of Vietnam, BSB Nanotech was presented with large amounts of rice husk, a waste product of rice milling. Building upon the business principle of reducing waste by reuse, BSB Nanotech has embarked on a journey to discover the value that rice husk could offer.

In the attempt to derive by-products from rice husk, BSB Nanotech learns that the most significant value held within rice husk ash is the high content of naturally present silica. Currently, sand and quartz are the only other naturally occurring silica sources. However, extracting silica from sand and quartz not only causes health hazards, but sand mining by itself presents a huge ecological and sociological problem. The utilization of rice husk ash to produce nanoporous silica is a positive step towards both a bio-based and circular economy, as ultrafine silica/nanosilica can be manufactured from this renewable resource and agricultural waste.

After 4 years of extensive research and development, a highly dedicated team of researchers of BSB Nanotech has successfully harnessed amorphous silica in its highest purity and quality from this waste material using a unique and patented technology. A new bio-based nanoporous silica under the BIOSILICO brand is now commercially available and can be customized to suit an array of applications.

OUR PROMISE TODAY FOR A BETTER TOMORROW

Today, BSB Nanotech is recognized as the world’s first producer of rice husk based nanoporous silica on a commercial scale. We are currently working with several global partners to expand the range of BIOSILICO’s applications from the Paints and Coatings to Rubber additives and Cosmetics industries.

To ensure that our products are delivered with its promised quality and committed schedule, BSB Nanotech undertook rigorous training and auditing to refine its operation, and production process and documentation to achieve the ISO [International Standards Organisation] QMS certification in 2020.

The company has embarked on a roadmap to become a global producer and developer of rice husk based nanoporous silica in both production volume and diverse applications.

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Maybe one of these days we’ll see BSB Nanotechnology at the annual Zero Waste Conference held here in Vancouver (Canada) during the autumn.

*See my July 10, 2014 posting scroll down [about 10%] to the University of California at Riverside news release for difficulties of working with silicon at the nanoscale, then scroll down about 40% to the discussion of Sand Wars, a documentary about how our appetite for silica (silicon dioxide) is depleting our beaches of sand.*

Living optical fibers

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The word ‘living’ isn’t usually associated with optical fibers and the addition had me thinking that this October 11, 2021 Nanowerk Spotlight story by Michael Berger would be a synthetic biology story. Well, not exactly. Do read on for a good introduction describing glass, fiber optics, and optogenetics,

Glass is one of the oldest manufactured materials used by humans and glass making dates back at least 6000 years, long before humans had discovered how to smelt iron. Glasses have been based on the chemical compound silica – silicon dioxide, or quartz – the primary constituent of sand. Soda-lime glass, containing around 70% silica, accounts for around 90% of manufactured glass.

Historically, we are familiar with glasses’ decorative use or as window panes, household items, and in optics such as eyeglasses, microscopes and telescopes. More recently, starting in the 1950s, glass has been used in the manufacture of fiber optic cables, a technology that has revolutionized the communications industry and helped ring in the digital revolution.

Fiber optic cables propagate a signal as a pulse of light along a transparent medium, usually glass. This is not only used to transmit information but, for instance in many healthcare and biomedical applications, scientists use optical fibers for sensing applications by shining light into a sample and evaluating the absorbed or transmitted light.

A recent development in this field is optogenetics, a neuromodulation method that uses activation or deactivation of brain cells by illumination with different colors of light in order to treat brain disorders.

…

Berger goes on to explain the latest work and reveals what ‘living’ means where this work is concerned,

This work represents a simple and low-cost approach to fabricating optical fibers made from biological materials. These fibers can be easily modified for specific applications and don’t require sophisticated equipment to generate relevant information. This method could be used for many practical sensing and biological modeling applications.

…

“We use a natural, ionic, and biologically compatible crosslinking approach, which enables us to produce flexible hydrogel fibers in continuous multi-layered architectures, meaning they are easy to produce and can be modified after fabrication,” explains Guimarães [Carlos Guimarães, the paper’s first author]. “Similarly to silica fibers, the core hydrogel of our structures can be exposed, fused to another fiber or reassembled if they break, and efficiently guide light through the established connection.”

These flexible hydrogel fibers are made from sugars and work just like solid-state optical fibers used to transmit data. However, they are biocompatible so they can be easily integrated with biological systems.

“We could even consider them to be alive [emphasis mine] since we can use them to grow living cells inside the fiber,” says Guimarães. “As these embedded cells grow over time, we can then use light to inform on living dynamic events, for example to track cancer invasive proliferation into optical information.” [emphasis mine]

…

As to what constitutes optical information in this context,

Another intriguing aspect of these hydrogel fibers is that their permeable mesh enables the inclusion of biological targets of interest for detection. For example, the scientists observed that fibers were able to soak SARS-CoV-2 viruses, and by integrating nanoparticles for their binding and detection, shifts in visible light could be observed for detecting the accumulation of viral particles within the fiber.

“When light moving through the fiber encounters living cells, it changes its characteristics depending on cellular density, invasive proliferation, expression of molecules, etc.” Guimarães notes. “This light-cell interaction can digitize complex biological events, converting responses such as cancer cell progression in 3D environments and susceptibility to drugs into numbers and data, very fast and without the need for sample destruction.”

Here’s a link to and a citation for the paper,

Engineering Polysaccharide-Based Hydrogel Photonic Constructs: From Multiscale Detection to the Biofabrication of Living Optical Fibers by Carlos F. Guimarães, Rajib Ahmed, Amideddin Mataji-Kojouri, Fernando Soto, Jie Wang, Shiqin Liu, Tanya Stoyanova, Alexandra P. Marques, Rui L. Reis, Utkan Demirci. Advanced Materials DOI: https://doi.org/10.1002/adma.202105361 First published: 07 October 2021

This paper is behind a paywall.

Australians protect grain with diatoms (Nature’s nanofabrication factories)

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A Feb. 5, 2014 news item on Nanowerk highlights a presentation about protecting grain from insects given at the  ICONN2014-ACMM23 conference for nanoscience and microscopy held Feb. 3 -6, 2014 at the University of Adelaide (Australia). From the news item,

University of Adelaide researchers are using nanotechnology and the fossils of single-celled algae to develop a novel chemical-free and resistance-free way of protecting stored grain from insects.

The researchers are taking advantage of the unique properties of these single-celled algae, called diatoms. Diatoms have been called Nature’s nanofabrication factories because of their production of tiny (nanoscale) structures made from silica which have a range of properties of potential interest for nanotechnology.

“One area of our research is focussed on transforming this cheap diatom silica, readily available as a by-product of mining, into valuable nanomaterials for diverse applications – one of which is pest control,” says Professor Dusan Losic, ARC Future Fellow in the University’s School of Chemical Engineering.

The Feb. 5, 2014 University of Adelaide media release, which originated the news item, provides more insight into the research,

“There are two looming issues for the world-wide protection against insect pests of stored grain: firstly, the development of resistance by many species to conventional pest controls – insecticides and the fumigant phosphine – and, secondly, the increasing consumer demand for residue-free grain products and food,” Professor Losic says.

“In the case of Australia, we export grain worth about $8 billion each year – about 25 million tonnes – which could be under serious threat. We urgently need to find alternative methods for stored grain protection which are ecologically sound and resistance-free.”

The researchers are using a natural, non-toxic silica material based on the ‘diatomaceous earths’ formed by the fossilisation of diatoms. The material disrupts the insect’s protective cuticle, causing the insect to dehydrate.

“This is a natural and non-toxic material with a significant advantage being that, as only a physical mode of action is involved, the insects won’t develop resistance,” says Professor Losic. [emphasis mine]

“Equally important is that it is environmentally stable with high insecticidal activity for a long period of time. Therefore, stored products can be protected for longer periods of time without the need for frequent re-application.”

PhD student Sheena Chen is presenting her findings on the insecticidal activity of the material. PhD student John Hayles is also working on the project. The research is funded by the Grains Research and Development Corporation. The researchers are in the final stages of optimising the formula of the material.

This work be may of interest to Canadian farmers especially since 2013 featured the largest wheat and canola harvests in Canadian history according to a Dec. 4, 2013 article by Terryn Shiells for AgCanada.com,

“There’s just no getting around it, this is the biggest crop of Canadian history and it’s basically a shocker all around,” said Mike Jubinville of ProFarmer Canada in Winnipeg. “I really can’t think of a crop, other than peas and lentils, that didn’t provide an upside that betters what trade expectations were.”

…

Because all of the crops are so huge, it won’t be possible to move the entire crop this year, Jubinville said.

“We’re going to argue all we want about rail car allocations, about slow deliverable opportunities, but there’s just no way that the Canadian commercial handling system can move this crop,” he said.

…

Because there just isn’t enough capacity to get everything moved this year, there will also likely be larger than anticipated carryover stocks of all crops.

I imagine these bumper crops will mean there are storage issues which brings this piece back to the Australians and their work on preserving stored grain by using diatoms and silica material.  Perhaps Canadian farmers would like to test this “new natural and non-toxic material” once the formula has been optimized.

You probably can’t poison yourself by eating too many nanoparticles

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Researchers, Ingrid Bergin in the Unit for Laboratory Animal Medicine, at the University of Michigan in Ann Arbor and Frank Witzmann in the Department of Cellular and Integrative Physiology, at Indiana University School of Medicine, in Indianapolis, have stated that ingesting food and beverage (translated by me from the more scientific description) with nanoparticles (at today’s current levels) is unlikely to prove toxic. A June 26, 2013 Inderscience news release on EurekAlert describes the researchers’ research and their conclusions,

Writing in a forthcoming issue of the International Journal of Biomedical Nanoscience and Nanotechnology, researchers have compared existing laboratory and experimental animal studies pertaining to the toxicity of nanoparticles most likely to be intentionally or accidentally ingested. Based on their review, the researchers determined ingestion of nanoparticles at likely exposure levels is unlikely to cause health problems, at least with respect to acute toxicity. Furthermore, in vitro laboratory testing, which often shows toxicity at a cellular level, does not correspond well with in vivo testing, which tends to show less adverse effects.

Ingrid Bergin in the Unit for Laboratory Animal Medicine, at the University of Michigan in Ann Arbor and Frank Witzmann in the Department of Cellular and Integrative Physiology, at Indiana University School of Medicine, in Indianapolis, explain that the use of particles that are in the nano size range (from 1 billionth to 100 billionths of a meter in diameter, 1-100 nm, other thereabouts) are finding applications in consumer products and medicine. These include particles such as nano-silver, which is increasingly used in consumer products and dietary supplements for its purported antimicrobial properties. Nanoparticles can have some intriguing and useful properties because they do not necessarily behave in the same chemical and physical ways as non-nanoparticle versions of the same material.

Nanoparticles are now used as natural flavor enhancers in the form of liposomes and related materials, food pigments and in some so-called “health supplements”. They are also used in antibacterial toothbrushes coated with silver nanoparticles, for instance in food and drink containers and in hygienic infant feeding equipment. They are also used to carry pharmaceuticals to specific disease sites in the body to reduce side effects. Nanoparticles actually encompass a very wide range of materials from pure metals and alloys, to metal oxide nanoparticles, and carbon-based and plastic nanoparticles. Because of their increasing utilization in consumer products, there has been concern over whether these small scale materials could have unique toxicity effects when compared to more traditional versions of the same materials.

Difficulties in assessing the health risks of nanoparticles include the fact that particles of differing materials and shapes can have different properties. Furthermore, the route of exposure (e.g. ingestion vs. inhalation) affects the likelihood of toxicity. The U.S. researchers evaluated the current literature specifically with respect to toxicity of ingested nanoparticles. They point out that, in addition to intentional ingestion as with dietary supplements, unintentional ingestion can occur due to nanoparticle presence in water or as a breakdown product from coated consumer goods. Inhaled nanoparticles also represent an ingestion hazard since they are coughed up, swallowed, and eliminated through the intestinal tract.

Based on their review, the team concludes that, “Ingested nanoparticles appear unlikely to have acute or severe toxic effects at typical levels of exposure.” Nevertheless, they add that the current literature is inadequate to assess whether nanoparticles can accumulate in tissues and have long-term effects or whether they might cause subtle alterations in gut microbial populations. The researchers stress that better methods are needed for correlating particle concentrations used for cell-based assessment of toxicity with the actual likely exposure levels to body cells. Such methods may lead to better predictive value for laboratory in vitro testing, which currently over-predicts toxicity of ingested nanoparticles as compared to in vivo testing.

The researchers focused specifically on ingestion via the gastrointestinal tract which I take to mean that they focused largely on nanoparticles in food (eaten) and liquid (swallowed).

Here’s a link to and citation for the paper,

Nanoparticle toxicity by the gastrointestinal route: evidence and knowledge gaps by Ingrid L. Bergin; Frank A. Witzmann.  Int. J. of Biomedical Nanoscience and Nanotechnology, 2013 Vol.3, No.1/2, pp.163 – 210.  DOI: 10.1504/IJBNN.2013.054515

I think the abstract further helps to understand the research focus,

The increasing interest in nanoparticles for advanced technologies, consumer products, and biomedical applications has led to great excitement about potential benefits but also concern over the potential for adverse human health effects. The gastrointestinal tract represents a likely route of entry for many nanomaterials, both directly through intentional ingestion or indirectly via nanoparticle dissolution from food containers or by secondary ingestion of inhaled particles. Additionally, increased utilisation of nanoparticles may lead to increased environmental contamination and unintentional ingestion via water, food animals, or fish. The gastrointestinal tract is a site of complex, symbiotic interactions between host cells and the resident microbiome. Accordingly, evaluation of nanoparticles must take into consideration not only absorption and extraintestinal organ accumulation but also the potential for altered gut microbes and the effects of this perturbation on the host. The existing literature was evaluated for evidence of toxicity based on these considerations. Focus was placed on three categories of nanomaterials: nanometals and metal oxides, carbon-based nanoparticles, and polymer/dendrimers with emphasis on those particles of greatest relevance to gastrointestinal exposures.

The article is behind a paywall.

I last mentioned Frank Witzmann here in a May 8, 2013 posting titled, US multicenter (Nano GO Consortium) study of engineered nanomaterial toxicology.